hdf5/test/vfd.c

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://www.hdfgroup.org/licenses.               *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 * Purpose:     Tests the basic features of Virtual File Drivers
 */

#include "h5test.h"

#define KB            1024U
#define FAMILY_NUMBER 4
#define FAMILY_SIZE   (1 * KB)
#define FAMILY_SIZE2  (5 * KB)
#define MULTI_SIZE    128
#define SPLITTER_SIZE 8 /* dimensions of a dataset */

#define CORE_INCREMENT (4 * KB)
#define CORE_PAGE_SIZE (1024 * KB)
#define CORE_DSET_NAME "core dset"
#define CORE_DSET_DIM1 1024
#define CORE_DSET_DIM2 32

#define DSET1_NAME "dset1"
#define DSET1_DIM1 1024
#define DSET1_DIM2 32
#define DSET3_NAME "dset3"

/* Macros for Direct VFD */
#ifdef H5_HAVE_DIRECT
#define MBOUNDARY  512
#define FBSIZE     (4 * KB)
#define CBSIZE     (8 * KB)
#define THRESHOLD  1
#define DSET2_NAME "dset2"
#define DSET2_DIM  4
#endif /* H5_HAVE_DIRECT */

static const char *FILENAME[] = {"sec2_file",            /*0*/
                                 "core_file",            /*1*/
                                 "family_file",          /*2*/
                                 "new_family_v16",       /*3*/
                                 "multi_file",           /*4*/
                                 "direct_file",          /*5*/
                                 "log_file",             /*6*/
                                 "stdio_file",           /*7*/
                                 "windows_file",         /*8*/
                                 "new_multi_file_v16",   /*9*/
                                 "ro_s3_file",           /*10*/
                                 "splitter_rw_file",     /*11*/
                                 "splitter_wo_file",     /*12*/
                                 "splitter.log",         /*13*/
                                 "ctl_file",             /*14*/
                                 "ctl_splitter_wo_file", /*15*/
                                 NULL};

#define LOG_FILENAME "log_vfd_out.log"

#define COMPAT_BASENAME       "family_v16"
#define MULTI_COMPAT_BASENAME "multi_file_v16"
#define SPLITTER_DATASET_NAME "dataset"

/* Macro: HEXPRINT()
 * Helper macro to pretty-print hexadecimal output of a buffer of known size.
 * Each line has the address of the first printed byte, and four columns of
 * four-byte data.
 */
static int __k;
#define HEXPRINT(size, buf)                                                                                  \
    do {                                                                                                     \
        for (__k = 0; __k < (size); __k++) {                                                                 \
            if (__k % 16 == 0) {                                                                             \
                printf("\n%04x", __k);                                                                       \
            }                                                                                                \
            printf((__k % 4 == 0) ? "  %02X" : " %02X", (unsigned char)(buf)[__k]);                          \
        }                                                                                                    \
    } while (0) /* end #define HEXPRINT() */

/* Macro SET_SIZE()
 *
 * Helper macro to track the sizes of entries in a vector
 * I/O call when stepping through the vector incrementally.
 * Assuming that bool_size_fixed is initialized to false
 * before the scan, this macro will detect the sizes array
 * optimization for the case in which all remaining entries
 * are of the same size, and set size_value accordingly.
 *
 *                                   JRM -- 3/11/21
 */
#define SET_SIZE(bool_size_fixed, sizes_array, size_value, idx)                                              \
    do {                                                                                                     \
        if (!(bool_size_fixed)) {                                                                            \
                                                                                                             \
            if ((sizes_array)[idx] == 0) {                                                                   \
                                                                                                             \
                assert((idx) > 0);                                                                           \
                (bool_size_fixed) = true;                                                                    \
            }                                                                                                \
            else {                                                                                           \
                                                                                                             \
                (size_value) = (sizes_array)[idx];                                                           \
            }                                                                                                \
        }                                                                                                    \
    } while (false)

/* Macro SET_TYPE()
 *
 * Helper macro to track the types of entries in a vector
 * I/O call when stepping through the vector incrementally.
 * Assuming that bool_type_fixed is initialized to false
 * before the scan, this macro will detect the types array
 * optimization for the case in which all remaining entries
 * are of the same type, and set type_value accordingly.
 *
 *                                   JRM -- 3/11/21
 */
#define SET_TYPE(bool_type_fixed, types_array, type_value, idx)                                              \
    do {                                                                                                     \
        if (!(bool_type_fixed)) {                                                                            \
                                                                                                             \
            if ((types_array)[idx] == H5FD_MEM_NOLIST) {                                                     \
                                                                                                             \
                assert((idx) > 0);                                                                           \
                (bool_type_fixed) = true;                                                                    \
            }                                                                                                \
            else {                                                                                           \
                                                                                                             \
                (type_value) = (types_array)[idx];                                                           \
            }                                                                                                \
        }                                                                                                    \
    } while (false)

/* Helper structure to pass around dataset information.
 */
struct splitter_dataset_def {
    void          *buf;         /* contents of dataset */
    const char    *dset_name;   /* dataset name, always added to root group */
    hid_t          mem_type_id; /* datatype */
    const hsize_t *dims;        /* dimensions */
    int            n_dims;      /* rank */
};

/* Op code type enum for ctl callback test */
typedef enum {
    CTL_OPC_KNOWN_PASSTHROUGH, /* op code known to passthrough VFD */
    CTL_OPC_KNOWN_TERMINAL,    /* op code known to terminal VFD    */
    CTL_OPC_UNKNOWN            /* unknown op code                  */
} ctl_test_opc_type;

static int splitter_prepare_file_paths(H5FD_splitter_vfd_config_t *vfd_config, char *filename_rw_out);
static int splitter_create_single_file_at(const char *filename, hid_t fapl_id,
                                          const struct splitter_dataset_def *data);
static int splitter_compare_expected_data(hid_t file_id, const struct splitter_dataset_def *data);
static int run_splitter_test(const struct splitter_dataset_def *data, bool ignore_wo_errors,
                             bool provide_logfile_path, const hid_t sub_fapl_ids[2]);
static int splitter_RO_test(const struct splitter_dataset_def *data, hid_t child_fapl_id);
static int splitter_tentative_open_test(hid_t child_fapl_id);
static int file_exists(const char *filename, hid_t fapl_id);

static herr_t  run_ctl_test(uint64_t op_code, uint64_t flags, ctl_test_opc_type opc_type, hid_t fapl_id);
static H5FD_t *H5FD__ctl_test_vfd_open(const char *name, unsigned flags, hid_t fapl_id, haddr_t maxaddr);
static herr_t  H5FD__ctl_test_vfd_close(H5FD_t *_file);
static haddr_t H5FD__ctl_test_vfd_get_eoa(const H5FD_t *_file, H5FD_mem_t type);
static herr_t  H5FD__ctl_test_vfd_set_eoa(H5FD_t *_file, H5FD_mem_t type, haddr_t addr);
static haddr_t H5FD__ctl_test_vfd_get_eof(const H5FD_t *_file, H5FD_mem_t type);
static herr_t  H5FD__ctl_test_vfd_read(H5FD_t *_file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr,
                                       size_t size, void *buf);
static herr_t  H5FD__ctl_test_vfd_write(H5FD_t *_file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr,
                                        size_t size, const void *buf);
static herr_t  H5FD__ctl_test_vfd_ctl(H5FD_t *_file, uint64_t op_code, uint64_t flags, const void *input,
                                      void **output);

/*-------------------------------------------------------------------------
 * Function:    test_sec2
 *
 * Purpose:     Tests the file handle interface for SEC2 driver
 *
 * Return:      Success:        0
 *              Failure:        -1
 *
 *-------------------------------------------------------------------------
 */
static herr_t
test_sec2(void)
{
    hid_t         fid          = H5I_INVALID_HID; /* file ID                      */
    hid_t         fapl_id      = H5I_INVALID_HID; /* file access property list ID */
    hid_t         fapl_id_out  = H5I_INVALID_HID; /* from H5Fget_access_plist     */
    hid_t         driver_id    = H5I_INVALID_HID; /* ID for this VFD              */
    unsigned long driver_flags = 0;               /* VFD feature flags            */
    char          filename[1024];                 /* filename                     */
    void         *os_file_handle = NULL;          /* OS file handle               */
    hsize_t       file_size;                      /* file size                    */

    TESTING("SEC2 file driver");

    /* Set property list and file name for SEC2 driver. */
    if ((fapl_id = H5Pcreate(H5P_FILE_ACCESS)) < 0)
        TEST_ERROR;
    if (H5Pset_fapl_sec2(fapl_id) < 0)
        TEST_ERROR;
    h5_fixname(FILENAME[0], fapl_id, filename, sizeof(filename));

    /* Check that the VFD feature flags are correct */
    if ((driver_id = H5Pget_driver(fapl_id)) < 0)
        TEST_ERROR;
    if (H5FDdriver_query(driver_id, &driver_flags) < 0)
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_AGGREGATE_METADATA))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_ACCUMULATE_METADATA))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_DATA_SIEVE))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_AGGREGATE_SMALLDATA))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_POSIX_COMPAT_HANDLE))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_SUPPORTS_SWMR_IO))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_DEFAULT_VFD_COMPATIBLE))
        TEST_ERROR;
    /* Check for extra flags not accounted for above */
    if (driver_flags != (H5FD_FEAT_AGGREGATE_METADATA | H5FD_FEAT_ACCUMULATE_METADATA | H5FD_FEAT_DATA_SIEVE |
                         H5FD_FEAT_AGGREGATE_SMALLDATA | H5FD_FEAT_POSIX_COMPAT_HANDLE |
                         H5FD_FEAT_SUPPORTS_SWMR_IO | H5FD_FEAT_DEFAULT_VFD_COMPATIBLE))
        TEST_ERROR;

    if ((fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id)) < 0)
        TEST_ERROR;

    /* Retrieve the access property list... */
    if ((fapl_id_out = H5Fget_access_plist(fid)) < 0)
        TEST_ERROR;

    /* Check that the driver is correct */
    if (H5FD_SEC2 != H5Pget_driver(fapl_id_out))
        TEST_ERROR;

    /* ...and close the property list */
    if (H5Pclose(fapl_id_out) < 0)
        TEST_ERROR;

    /* Check that we can get an operating-system-specific handle from
     * the library.
     */
    if (H5Fget_vfd_handle(fid, H5P_DEFAULT, &os_file_handle) < 0)
        TEST_ERROR;
    if (os_file_handle == NULL)
        FAIL_PUTS_ERROR("NULL os-specific vfd/file handle was returned from H5Fget_vfd_handle");

    /* There is no guarantee the size of metadata in file is constant.
     * Just try to check if it's reasonable.
     *
     * Currently it should be around 2 KB.
     */
    if (H5Fget_filesize(fid, &file_size) < 0)
        TEST_ERROR;
    if (file_size < 1 * KB || file_size > 4 * KB)
        FAIL_PUTS_ERROR("suspicious file size obtained from H5Fget_filesize");

    /* Close and delete the file */
    if (H5Fclose(fid) < 0)
        TEST_ERROR;
    h5_delete_test_file(FILENAME[0], fapl_id);

    /* Close the fapl */
    if (H5Pclose(fapl_id) < 0)
        TEST_ERROR;

    PASSED();
    return 0;

error:
    H5E_BEGIN_TRY
    {
        H5Pclose(fapl_id);
        H5Pclose(fapl_id_out);
        H5Fclose(fid);
    }
    H5E_END_TRY
    return -1;
} /* end test_sec2() */

/*-------------------------------------------------------------------------
 * Function:    test_core
 *
 * Purpose:     Tests the file handle interface for CORE driver
 *
 * Return:      Success:        0
 *              Failure:        -1
 *
 *-------------------------------------------------------------------------
 */
static herr_t
test_core(void)
{
    hid_t         fid          = H5I_INVALID_HID; /* file ID                      */
    hid_t         fapl_id      = H5I_INVALID_HID; /* file access property list ID */
    hid_t         fapl_id_out  = H5I_INVALID_HID; /* from H5Fget_access_plist     */
    hid_t         driver_id    = H5I_INVALID_HID; /* ID for this VFD              */
    unsigned long driver_flags = 0;               /* VFD feature flags            */
    hid_t         did          = H5I_INVALID_HID; /* dataset ID                   */
    hid_t         sid          = H5I_INVALID_HID; /* dataspace ID                 */
    char          filename[1024];                 /* filename                     */
    void         *os_file_handle = NULL;          /* OS file handle               */
    hsize_t       file_size;                      /* file size                    */
    size_t        increment;                      /* core VFD increment           */
    bool          backing_store;                  /* use backing store?           */
    bool          use_write_tracking;             /* write tracking flag          */
    size_t        write_tracking_page_size;       /* write tracking page size     */
    int          *data_w = NULL;                  /* data written to the dataset  */
    int          *data_r = NULL;                  /* data read from the dataset   */
    int           val;                            /* data value                   */
    int          *pw = NULL, *pr = NULL;          /* pointers for iterating over
                                                     data arrays (write & read)   */
    hsize_t dims[2];                              /* dataspace dimensions         */
    int     i, j;                                 /* iterators                    */
    htri_t  status;                               /* return value from H5Lexists  */

    TESTING("CORE file driver");

    /* Get a file access property list and fix up the file name */
    if ((fapl_id = H5Pcreate(H5P_FILE_ACCESS)) < 0)
        TEST_ERROR;
    h5_fixname(FILENAME[1], fapl_id, filename, sizeof(filename));

    /************************************************************************
     * Check that the backing store flag works by creating a file, close
     * it, and ensure that the file does not exist.
     ************************************************************************/

    /* Make sure it's not present at the start of the test */
    if (HDaccess(filename, F_OK) != -1)
        if (HDremove(filename) < 0)
            FAIL_PUTS_ERROR("unable to remove backing store file");

    /* Create and close file w/ backing store off */
    if (H5Pset_fapl_core(fapl_id, (size_t)CORE_INCREMENT, false) < 0)
        TEST_ERROR;

    /* Check that the VFD feature flags are correct.
     * Note that the H5FDdriver_query() API call does not require a file
     * so backing-store related flags will not be returned here.
     */
    if ((driver_id = H5Pget_driver(fapl_id)) < 0)
        TEST_ERROR;
    if (H5FDdriver_query(driver_id, &driver_flags) < 0)
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_AGGREGATE_METADATA))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_ACCUMULATE_METADATA))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_DATA_SIEVE))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_AGGREGATE_SMALLDATA))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_ALLOW_FILE_IMAGE))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_CAN_USE_FILE_IMAGE_CALLBACKS))
        TEST_ERROR;
    /* Check for extra flags not accounted for above */
    if (driver_flags !=
        (H5FD_FEAT_AGGREGATE_METADATA | H5FD_FEAT_ACCUMULATE_METADATA | H5FD_FEAT_DATA_SIEVE |
         H5FD_FEAT_AGGREGATE_SMALLDATA | H5FD_FEAT_ALLOW_FILE_IMAGE | H5FD_FEAT_CAN_USE_FILE_IMAGE_CALLBACKS))
        TEST_ERROR;

    if ((fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id)) < 0)
        TEST_ERROR;
    if (H5Fclose(fid) < 0)
        TEST_ERROR;
    /* Check for the backing store file */
    if (HDaccess(filename, F_OK) != -1)
        FAIL_PUTS_ERROR("file created when backing store set to false");

    /************************************************************************
     * Check basic core VFD operation and properties. This is done with the
     * backing store on so a file will be created for later use.
     ************************************************************************/

    /* Turn the backing store on */
    if (H5Pset_fapl_core(fapl_id, (size_t)CORE_INCREMENT, true) < 0)
        TEST_ERROR;

    /* Check that write tracking is off by default and that the default
     * page size is non-zero.
     */
    if (H5Pget_core_write_tracking(fapl_id, &use_write_tracking, &write_tracking_page_size) < 0)
        TEST_ERROR;
    if (false != use_write_tracking)
        FAIL_PUTS_ERROR("write tracking should be off by default");
    if (0 == write_tracking_page_size)
        FAIL_PUTS_ERROR("write tracking page size should never be zero");

    /* Set core VFD properties */
    if (H5Pset_core_write_tracking(fapl_id, true, CORE_PAGE_SIZE) < 0)
        TEST_ERROR;

    /* Create the file */
    if ((fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id)) < 0)
        TEST_ERROR;

    /* Retrieve the access property list */
    if ((fapl_id_out = H5Fget_access_plist(fid)) < 0)
        TEST_ERROR;

    /* Check that the driver is correct */
    if (H5FD_CORE != H5Pget_driver(fapl_id_out))
        TEST_ERROR;

    /* Get the basic VFD properties from the fapl and ensure that
     * they are correct.
     */
    if (H5Pget_fapl_core(fapl_id_out, &increment, &backing_store) < 0)
        TEST_ERROR;
    if (increment != (size_t)CORE_INCREMENT)
        FAIL_PUTS_ERROR("incorrect increment from file fapl");
    if (backing_store != true)
        FAIL_PUTS_ERROR("incorrect backing store flag from file fapl");

    /* Check that the backing store write tracking info was saved */
    /* TODO: There is a bug where H5Fget_access_plist() does not return
     *       the write tracking properties. Until this bug is fixed, just
     *       test the main fapl_id.
     */
    if (H5Pget_core_write_tracking(fapl_id, &use_write_tracking, &write_tracking_page_size) < 0)
        TEST_ERROR;
    if (true != use_write_tracking)
        FAIL_PUTS_ERROR("write tracking flag incorrect in fapl obtained from H5Fget_access_plist");
    if (CORE_PAGE_SIZE != write_tracking_page_size)
        FAIL_PUTS_ERROR("write tracking page size incorrect in fapl obtained from H5Fget_access_plist");

    /* Close the property list */
    if (H5Pclose(fapl_id_out) < 0)
        TEST_ERROR;

    /* Check that we can get an operating-system-specific handle from
     * the library.
     */
    if (H5Fget_vfd_handle(fid, H5P_DEFAULT, &os_file_handle) < 0)
        TEST_ERROR;
    if (os_file_handle == NULL)
        FAIL_PUTS_ERROR("NULL os-specific vfd/file handle was returned from H5Fget_vfd_handle");

    /* There is no guarantee the size of metadata in file is constant.
     * Just try to check if it's reasonable.
     *
     * TODO: Needs justification of why is this is a reasonable size.
     */
    if (H5Fget_filesize(fid, &file_size) < 0)
        TEST_ERROR;
    if (file_size < 2 * KB || file_size > 6 * KB)
        FAIL_PUTS_ERROR("suspicious file size obtained from H5Fget_filesize");

    /* Close the file */
    if (H5Fclose(fid) < 0)
        TEST_ERROR;

    /************************************************************************
     * Make changes to the file with the backing store flag OFF to ensure
     * that they ARE NOT propagated.
     ************************************************************************/

    /* Open the file with backing store off for read and write.
     * Changes won't be saved in file.
     */
    if (H5Pset_fapl_core(fapl_id, (size_t)CORE_INCREMENT, false) < 0)
        TEST_ERROR;
    if ((fid = H5Fopen(filename, H5F_ACC_RDWR, fapl_id)) < 0)
        TEST_ERROR;

    /* Allocate memory for data set. */
    if (NULL == (data_w = (int *)malloc(DSET1_DIM1 * DSET1_DIM2 * sizeof(int))))
        FAIL_PUTS_ERROR("unable to allocate memory for input array");
    if (NULL == (data_r = (int *)malloc(DSET1_DIM1 * DSET1_DIM2 * sizeof(int))))
        FAIL_PUTS_ERROR("unable to allocate memory for output array");

    /* Initialize the buffers */
    val = 0;
    pw  = data_w;
    for (i = 0; i < CORE_DSET_DIM1; i++)
        for (j = 0; j < CORE_DSET_DIM2; j++)
            *pw++ = val++;
    memset(data_r, 0, DSET1_DIM1 * DSET1_DIM2 * sizeof(int));

    /* Create the dataspace */
    dims[0] = CORE_DSET_DIM1;
    dims[1] = CORE_DSET_DIM2;
    if ((sid = H5Screate_simple(2, dims, NULL)) < 0)
        TEST_ERROR;

    /* Create the dataset */
    if ((did = H5Dcreate2(fid, CORE_DSET_NAME, H5T_NATIVE_INT, sid, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) <
        0)
        TEST_ERROR;

    /* Write the data to the dataset */
    if (H5Dwrite(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, data_w) < 0)
        TEST_ERROR;

    /* Close and reopen the dataset */
    if (H5Dclose(did) < 0)
        TEST_ERROR;
    if ((did = H5Dopen2(fid, CORE_DSET_NAME, H5P_DEFAULT)) < 0)
        TEST_ERROR;

    /* Read the data back from dset1 */
    if (H5Dread(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, data_r) < 0)
        TEST_ERROR;

    /* Check that the values read are the same as the values written */
    pw = data_w;
    pr = data_r;
    for (i = 0; i < CORE_DSET_DIM1; i++)
        for (j = 0; j < CORE_DSET_DIM2; j++)
            if (*pr++ != *pw++) {
                H5_FAILED();
                printf("    Read different values than written in data set.\n");
                printf("    At index %d,%d\n", i, j);
                TEST_ERROR;
            } /* end if */

    /* Close everything except the dataspace ID (needed below)*/
    if (H5Dclose(did) < 0)
        TEST_ERROR;
    if (H5Fclose(fid) < 0)
        TEST_ERROR;

    /* Reopen the file and ensure that the dataset does not exist */
    if ((fid = H5Fopen(filename, H5F_ACC_RDWR, fapl_id)) < 0)
        TEST_ERROR;
    status = H5Lexists(fid, CORE_DSET_NAME, H5P_DEFAULT);
    if (status < 0)
        TEST_ERROR;
    if (status > 0)
        FAIL_PUTS_ERROR("core VFD dataset created in file when backing store disabled");

    /* Close the file */
    if (H5Fclose(fid) < 0)
        TEST_ERROR;

    /************************************************************************
     * Make changes to the file with the backing store flag ON to ensure
     * that they ARE propagated.
     ************************************************************************/

    /* Open the file with backing store on for read and write.
     * Changes will be saved in file.
     */
    if (H5Pset_fapl_core(fapl_id, (size_t)CORE_INCREMENT, true) < 0)
        TEST_ERROR;
    if ((fid = H5Fopen(filename, H5F_ACC_RDWR, fapl_id)) < 0)
        TEST_ERROR;

    /* Create the dataset */
    if ((did = H5Dcreate2(fid, CORE_DSET_NAME, H5T_NATIVE_INT, sid, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) <
        0)
        TEST_ERROR;

    /* Write the data to the dataset */
    if (H5Dwrite(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, data_w) < 0)
        TEST_ERROR;

    /* Close everything and reopen */
    if (H5Dclose(did) < 0)
        TEST_ERROR;
    if (H5Fclose(fid) < 0)
        TEST_ERROR;
    if ((fid = H5Fopen(filename, H5F_ACC_RDWR, fapl_id)) < 0)
        TEST_ERROR;
    if ((did = H5Dopen2(fid, CORE_DSET_NAME, H5P_DEFAULT)) < 0)
        TEST_ERROR;

    /* Read the data back from the dataset */
    memset(data_r, 0, DSET1_DIM1 * DSET1_DIM2 * sizeof(int));
    if (H5Dread(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, data_r) < 0)
        TEST_ERROR;

    /* Check that the values read are the same as the values written */
    pw = data_w;
    pr = data_r;
    for (i = 0; i < CORE_DSET_DIM1; i++)
        for (j = 0; j < CORE_DSET_DIM2; j++)
            if (*pw++ != *pr++) {
                H5_FAILED();
                printf("    Read different values than written in data set.\n");
                printf("    At index %d,%d\n", i, j);
                TEST_ERROR;
            } /* end if */

    /* Check file size API.
     * There is no guarantee the size of metadata in file is constant.
     * Just try to check if it's reasonable.
     *
     * TODO: Needs justification of why is this is a reasonable size.
     */
    if (H5Fget_filesize(fid, &file_size) < 0)
        TEST_ERROR;
    if (file_size < 64 * KB || file_size > 256 * KB)
        FAIL_PUTS_ERROR("suspicious file size obtained from H5Fget_filesize");

    /* Close everything */
    if (H5Sclose(sid) < 0)
        TEST_ERROR;
    if (H5Dclose(did) < 0)
        TEST_ERROR;

    free(data_w);
    free(data_r);

    /* Close and delete the file */
    if (H5Fclose(fid) < 0)
        TEST_ERROR;
    h5_delete_test_file(FILENAME[1], fapl_id);

    /************************************************************************
     * Check that delete behavior works correctly
     ************************************************************************/

    /* Create and close a file */
    if (H5Pset_fapl_core(fapl_id, (size_t)CORE_INCREMENT, true) < 0)
        TEST_ERROR;
    if ((fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id)) < 0)
        TEST_ERROR;
    if (H5Fclose(fid) < 0)
        TEST_ERROR;

    /* Try to delete the file with the backing store off (shouldn't delete anything) */
    if (H5Pset_fapl_core(fapl_id, (size_t)CORE_INCREMENT, false) < 0)
        TEST_ERROR;
    if (H5Fdelete(filename, fapl_id) < 0)
        TEST_ERROR;
    if (-1 == HDaccess(filename, F_OK))
        FAIL_PUTS_ERROR("file deleted when backing store set to false");

    /* Try to delete the file with the backing store on (should work) */
    if (H5Pset_fapl_core(fapl_id, (size_t)CORE_INCREMENT, true) < 0)
        TEST_ERROR;
    if (H5Fdelete(filename, fapl_id) < 0)
        TEST_ERROR;
    if (0 == HDaccess(filename, F_OK))
        FAIL_PUTS_ERROR("file not deleted when backing store set to true");

    /************************************************************************
     * Clean up
     ************************************************************************/

    /* Close the fapl */
    if (H5Pclose(fapl_id) < 0)
        TEST_ERROR;

    PASSED();
    return 0;

error:
    H5E_BEGIN_TRY
    {
        H5Sclose(sid);
        H5Dclose(did);
        H5Pclose(fapl_id_out);
        H5Pclose(fapl_id);
        H5Fclose(fid);
    }
    H5E_END_TRY

    if (data_w)
        free(data_w);
    if (data_r)
        free(data_r);

    return -1;
} /* end test_core() */

/*-------------------------------------------------------------------------
 * Function:    test_direct
 *
 * Purpose:     Tests the file handle interface for DIRECT I/O driver
 *
 * Return:      Success:        0
 *              Failure:        -1
 *
 *-------------------------------------------------------------------------
 */
static herr_t
test_direct(void)
{
#ifdef H5_HAVE_DIRECT
    hid_t file = H5I_INVALID_HID, fapl = H5I_INVALID_HID, access_fapl = H5I_INVALID_HID;
    hid_t dset1 = H5I_INVALID_HID, dset2 = H5I_INVALID_HID, space1 = H5I_INVALID_HID,
          space2 = H5I_INVALID_HID;
    char    filename[1024];
    int    *fhandle = NULL;
    hsize_t file_size;
    hsize_t dims1[2], dims2[1];
    size_t  mbound;
    size_t  fbsize;
    size_t  cbsize;
    void   *proto_points = NULL, *proto_check = NULL;
    int    *points = NULL, *check = NULL, *p1 = NULL, *p2 = NULL;
    int     wdata2[DSET2_DIM] = {11, 12, 13, 14};
    int     rdata2[DSET2_DIM];
    int     i, j, n;
#endif /*H5_HAVE_DIRECT*/

    TESTING("DIRECT I/O file driver");

#ifndef H5_HAVE_DIRECT
    SKIPPED();
    return 0;
#else  /*H5_HAVE_DIRECT*/

    /* Set property list and file name for Direct driver.  Set memory alignment boundary
     * and file block size to 512 which is the minimum for Linux 2.6. */
    if ((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
        TEST_ERROR;
    if (H5Pset_fapl_direct(fapl, MBOUNDARY, FBSIZE, CBSIZE) < 0)
        TEST_ERROR;
    h5_fixname(FILENAME[5], fapl, filename, sizeof filename);

    /* Verify the file access properties */
    if (H5Pget_fapl_direct(fapl, &mbound, &fbsize, &cbsize) < 0)
        TEST_ERROR;
    if (mbound != MBOUNDARY || fbsize != FBSIZE || cbsize != CBSIZE)
        TEST_ERROR;

    if (H5Pset_alignment(fapl, (hsize_t)THRESHOLD, (hsize_t)FBSIZE) < 0)
        TEST_ERROR;

    H5E_BEGIN_TRY
    {
        file = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl);
    }
    H5E_END_TRY
    if (file < 0) {
        H5Pclose(fapl);
        SKIPPED();
        printf("  Probably the file system doesn't support Direct I/O\n");
        return 0;
    }

    /* Retrieve the access property list... */
    if ((access_fapl = H5Fget_access_plist(file)) < 0)
        TEST_ERROR;

    /* Check that the driver is correct */
    if (H5FD_DIRECT != H5Pget_driver(access_fapl))
        TEST_ERROR;

    /* ...and close the property list */
    if (H5Pclose(access_fapl) < 0)
        TEST_ERROR;

    /* Check file handle API */
    if (H5Fget_vfd_handle(file, H5P_DEFAULT, (void **)&fhandle) < 0)
        TEST_ERROR;
    if (*fhandle < 0)
        TEST_ERROR;

    /* Check file size API */
    if (H5Fget_filesize(file, &file_size) < 0)
        TEST_ERROR;

    /* There is no guarantee of the number of metadata allocations, but it's
     * 4 currently and the size of the file should be between 3 & 4 file buffer
     * sizes..
     */
    if (file_size < (FBSIZE * 3) || file_size >= (FBSIZE * 4))
        TEST_ERROR;

    /* Allocate aligned memory for data set 1. For data set 1, everything is aligned including
     * memory address, size of data, and file address. */
    if (0 != posix_memalign(&proto_points, (size_t)FBSIZE, (size_t)(DSET1_DIM1 * DSET1_DIM2 * sizeof(int))))
        TEST_ERROR;
    points = proto_points;
    if (0 != posix_memalign(&proto_check, (size_t)FBSIZE, (size_t)(DSET1_DIM1 * DSET1_DIM2 * sizeof(int))))
        TEST_ERROR;
    check = proto_check;

    /* Initialize the dset1 */
    p1 = points;
    for (i = n = 0; i < DSET1_DIM1; i++)
        for (j = 0; j < DSET1_DIM2; j++)
            *p1++ = n++;

    /* Create the data space1 */
    dims1[0] = DSET1_DIM1;
    dims1[1] = DSET1_DIM2;
    if ((space1 = H5Screate_simple(2, dims1, NULL)) < 0)
        TEST_ERROR;

    /* Create the dset1 */
    if ((dset1 =
             H5Dcreate2(file, DSET1_NAME, H5T_NATIVE_INT, space1, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0)
        TEST_ERROR;

    /* Write the data to the dset1 */
    if (H5Dwrite(dset1, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, points) < 0)
        TEST_ERROR;

    if (H5Dclose(dset1) < 0)
        TEST_ERROR;

    if ((dset1 = H5Dopen2(file, DSET1_NAME, H5P_DEFAULT)) < 0)
        TEST_ERROR;

    /* Read the data back from dset1 */
    if (H5Dread(dset1, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, check) < 0)
        TEST_ERROR;

    /* Check that the values read are the same as the values written */
    p1 = points;
    p2 = check;
    for (i = 0; i < DSET1_DIM1; i++)
        for (j = 0; j < DSET1_DIM2; j++)
            if (*p1++ != *p2++) {
                H5_FAILED();
                printf("    Read different values than written in data set 1.\n");
                printf("    At index %d,%d\n", i, j);
                TEST_ERROR;
            } /* end if */

    /* Create the data space2. For data set 2, memory address and data size are not aligned. */
    dims2[0] = DSET2_DIM;
    if ((space2 = H5Screate_simple(1, dims2, NULL)) < 0)
        TEST_ERROR;

    /* Create the dset2 */
    if ((dset2 =
             H5Dcreate2(file, DSET2_NAME, H5T_NATIVE_INT, space2, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0)
        TEST_ERROR;

    /* Write the data to the dset1 */
    if (H5Dwrite(dset2, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, wdata2) < 0)
        TEST_ERROR;

    if (H5Dclose(dset2) < 0)
        TEST_ERROR;

    if ((dset2 = H5Dopen2(file, DSET2_NAME, H5P_DEFAULT)) < 0)
        TEST_ERROR;

    /* Read the data back from dset1 */
    if (H5Dread(dset2, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, rdata2) < 0)
        TEST_ERROR;

    /* Check that the values read are the same as the values written */
    for (i = 0; i < DSET2_DIM; i++)
        if (wdata2[i] != rdata2[i]) {
            H5_FAILED();
            printf("    Read different values than written in data set 2.\n");
            printf("    At index %d\n", i);
            TEST_ERROR;
        } /* end if */

    if (H5Sclose(space1) < 0)
        TEST_ERROR;
    if (H5Dclose(dset1) < 0)
        TEST_ERROR;
    if (H5Sclose(space2) < 0)
        TEST_ERROR;
    if (H5Dclose(dset2) < 0)
        TEST_ERROR;

    free(points);
    free(check);

    /* Close and delete the file */
    if (H5Fclose(file) < 0)
        TEST_ERROR;
    h5_delete_test_file(FILENAME[5], fapl);

    /* Close the fapl */
    if (H5Pclose(fapl) < 0)
        TEST_ERROR;

    PASSED();
    return 0;

error:
    H5E_BEGIN_TRY
    {
        H5Pclose(fapl);
        H5Sclose(space1);
        H5Dclose(dset1);
        H5Sclose(space2);
        H5Dclose(dset2);
        H5Fclose(file);
    }
    H5E_END_TRY

    if (proto_points)
        free(proto_points);
    if (proto_check)
        free(proto_check);

    return -1;
#endif /*H5_HAVE_DIRECT*/
}

/*-------------------------------------------------------------------------
 * Function:    test_family_opens
 *
 * Purpose:     Private function for test_family() to tests wrong ways of
 *              reopening family file.
 *
 * Return:      Success:        0
 *              Failure:        -1
 *
 *-------------------------------------------------------------------------
 */
/* Disable warning for "format not a string literal" here -QAK */
/*
 *      This pragma only needs to surround the snprintf() calls with
 *      'first_name' in the code below, but early (4.4.7, at least) gcc only
 *      allows diagnostic pragmas to be toggled outside of functions.
 */
H5_GCC_CLANG_DIAG_OFF("format-nonliteral")
static herr_t
test_family_opens(char *fname, hid_t fa_pl)
{
    hid_t file = H5I_INVALID_HID;
    char  first_name[1024];
    char  wrong_name[1024];
    int   i;

    /* Case 1: reopen file with 1st member file name and default property list */
    snprintf(first_name, sizeof(first_name), fname, 0);

    H5E_BEGIN_TRY
    {
        file = H5Fopen(first_name, H5F_ACC_RDWR, H5P_DEFAULT);
    }
    H5E_END_TRY
    if (file >= 0)
        TEST_ERROR;

    /* Case 2: reopen file with correct name template but default property list */
    H5E_BEGIN_TRY
    {
        file = H5Fopen(fname, H5F_ACC_RDWR, H5P_DEFAULT);
    }
    H5E_END_TRY
    if (file >= 0)
        TEST_ERROR;

    /* Case 3: reopen file with wrong member size */
    if (H5Pset_fapl_family(fa_pl, (hsize_t)128, H5P_DEFAULT) < 0)
        TEST_ERROR;

    H5E_BEGIN_TRY
    {
        file = H5Fopen(fname, H5F_ACC_RDWR, fa_pl);
    }
    H5E_END_TRY
    if (file >= 0)
        TEST_ERROR;

    /* Case 4: reopen file with wrong name template */
    strcpy(wrong_name, fname);
    for (i = 0; i < 1024; i++)
        if (wrong_name[i] == '5') {
            wrong_name[i] = '4';
            break;
        }

    if (H5Pset_fapl_family(fa_pl, (hsize_t)FAMILY_SIZE, H5P_DEFAULT) < 0)
        TEST_ERROR;

    H5E_BEGIN_TRY
    {
        file = H5Fopen(wrong_name, H5F_ACC_RDWR, fa_pl);
    }
    H5E_END_TRY
    if (file >= 0)
        TEST_ERROR;

    return 0;

error:
    return -1;
} /* end test_family_opens() */
H5_GCC_CLANG_DIAG_ON("format-nonliteral")

/*-------------------------------------------------------------------------
 * Function:    test_family
 *
 * Purpose:     Tests the file handle interface for FAMILY driver
 *
 * Return:      SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
static herr_t
test_family(void)
{
    hid_t file = H5I_INVALID_HID, fapl = H5I_INVALID_HID, fapl2 = H5I_INVALID_HID, space = H5I_INVALID_HID,
          dset                 = H5I_INVALID_HID;
    hid_t         access_fapl  = H5I_INVALID_HID;
    hid_t         driver_id    = H5I_INVALID_HID; /* ID for this VFD              */
    unsigned long driver_flags = 0;               /* VFD feature flags            */
    char          filename[1024];
    char          dname[] = "dataset";
    unsigned int  i, j;
    int          *fhandle = NULL, *fhandle2 = NULL;
    int         **buf      = NULL;
    int          *buf_data = NULL;
    hsize_t       dims[2]  = {FAMILY_NUMBER, FAMILY_SIZE};
    hsize_t       file_size;

    TESTING("FAMILY file driver");

    /* Set up data array */
    if (NULL == (buf_data = (int *)calloc(FAMILY_NUMBER * FAMILY_SIZE, sizeof(int))))
        TEST_ERROR;
    if (NULL == (buf = (int **)calloc(FAMILY_NUMBER, sizeof(buf_data))))
        TEST_ERROR;
    for (i = 0; i < FAMILY_NUMBER; i++)
        buf[i] = buf_data + (i * FAMILY_SIZE);

    /* Set property list and file name for FAMILY driver */
    if ((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
        TEST_ERROR;
    if (H5Pset_fapl_family(fapl, (hsize_t)FAMILY_SIZE, H5P_DEFAULT) < 0)
        TEST_ERROR;
    h5_fixname(FILENAME[2], fapl, filename, sizeof(filename));

    /* Check that the VFD feature flags are correct */
    if ((driver_id = H5Pget_driver(fapl)) < 0)
        TEST_ERROR;
    if (H5FDdriver_query(driver_id, &driver_flags) < 0)
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_AGGREGATE_METADATA))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_ACCUMULATE_METADATA))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_DATA_SIEVE))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_AGGREGATE_SMALLDATA))
        TEST_ERROR;
    /* Check for extra flags not accounted for above */
    if (driver_flags != (H5FD_FEAT_AGGREGATE_METADATA | H5FD_FEAT_ACCUMULATE_METADATA | H5FD_FEAT_DATA_SIEVE |
                         H5FD_FEAT_AGGREGATE_SMALLDATA))
        TEST_ERROR;

    if ((file = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0)
        TEST_ERROR;

    if (H5Fclose(file) < 0)
        TEST_ERROR;

    /* Test different wrong ways to reopen family files where there's only
     * one member file existing. */
    if (test_family_opens(filename, fapl) < 0)
        TEST_ERROR;

    /* Reopen the file with default member file size */
    if (H5Pset_fapl_family(fapl, (hsize_t)H5F_FAMILY_DEFAULT, H5P_DEFAULT) < 0)
        TEST_ERROR;

    if ((file = H5Fopen(filename, H5F_ACC_RDWR, fapl)) < 0)
        TEST_ERROR;

    /* Check file size API */
    if (H5Fget_filesize(file, &file_size) < 0)
        TEST_ERROR;

    /* The file size is supposed to be about 800 bytes right now. */
    if (file_size < (KB / 2) || file_size > KB)
        TEST_ERROR;

    /* Create and write dataset */
    if ((space = H5Screate_simple(2, dims, NULL)) < 0)
        TEST_ERROR;

    /* Retrieve the access property list... */
    if ((access_fapl = H5Fget_access_plist(file)) < 0)
        TEST_ERROR;

    /* Check that the driver is correct */
    if (H5FD_FAMILY != H5Pget_driver(access_fapl))
        TEST_ERROR;

    /* ...and close the property list */
    if (H5Pclose(access_fapl) < 0)
        TEST_ERROR;

    if ((dset = H5Dcreate2(file, dname, H5T_NATIVE_INT, space, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0)
        TEST_ERROR;

    for (i = 0; i < FAMILY_NUMBER; i++)
        for (j = 0; j < FAMILY_SIZE; j++)
            buf[i][j] = (int)((i * 10000) + j);

    if (H5Dwrite(dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_data) < 0)
        TEST_ERROR;

    /* check file handle API */
    if ((fapl2 = H5Pcreate(H5P_FILE_ACCESS)) < 0)
        TEST_ERROR;
    if (H5Pset_family_offset(fapl2, (hsize_t)0) < 0)
        TEST_ERROR;

    if (H5Fget_vfd_handle(file, fapl2, (void **)&fhandle) < 0)
        TEST_ERROR;
    if (*fhandle < 0)
        TEST_ERROR;

    if (H5Pset_family_offset(fapl2, (hsize_t)(FAMILY_SIZE * 2)) < 0)
        TEST_ERROR;
    if (H5Fget_vfd_handle(file, fapl2, (void **)&fhandle2) < 0)
        TEST_ERROR;
    if (*fhandle2 < 0)
        TEST_ERROR;

    /* Check file size API */
    if (H5Fget_filesize(file, &file_size) < 0)
        TEST_ERROR;

        /* Some data has been written.  The file size should be bigger (18KB+976)
         * bytes if int size is 4 bytes) now. */
#if H5_SIZEOF_INT <= 4
    if (file_size < (18 * KB) || file_size > (20 * KB))
        TEST_ERROR;
#elif H5_SIZEOF_INT >= 8
    if (file_size < (32 * KB) || file_size > (40 * KB))
        TEST_ERROR;
#endif

    if (H5Sclose(space) < 0)
        TEST_ERROR;
    if (H5Dclose(dset) < 0)
        TEST_ERROR;
    if (H5Pclose(fapl2) < 0)
        TEST_ERROR;
    if (H5Fclose(file) < 0)
        TEST_ERROR;

    /* Test different wrong ways to reopen family files when there're multiple
     * member files existing. */
    if (test_family_opens(filename, fapl) < 0)
        TEST_ERROR;

    /* Reopen the file with correct member file size. */
    if (H5Pset_fapl_family(fapl, (hsize_t)FAMILY_SIZE, H5P_DEFAULT) < 0)
        TEST_ERROR;

    if ((file = H5Fopen(filename, H5F_ACC_RDWR, fapl)) < 0)
        TEST_ERROR;

    /* Close and delete the file */
    if (H5Fclose(file) < 0)
        TEST_ERROR;
    h5_delete_test_file(FILENAME[2], fapl);

    /* Close the fapl */
    if (H5Pclose(fapl) < 0)
        TEST_ERROR;

    free(buf);
    free(buf_data);

    PASSED();
    return SUCCEED;

error:
    H5E_BEGIN_TRY
    {
        H5Sclose(space);
        H5Dclose(dset);
        H5Pclose(fapl);
        H5Pclose(fapl2);
        H5Fclose(file);
    }
    H5E_END_TRY

    free(buf);
    free(buf_data);

    return FAIL;
} /* end test_family() */

/*-------------------------------------------------------------------------
 * Function:    test_family_compat
 *
 * Purpose:     Tests the backward compatibility for FAMILY driver.
 *              See if we can open files created with v1.6 library.
 *              The source file was created by the test/file_handle.c
 *              of the v1.6 library.  Then tools/misc/h5repart.c was
 *              used to concatenated.  The command was "h5repart -m 5k
 *              family_file%05d.h5 family_v16_%05d.h5".
 *
 * Return:      Success:        0
 *              Failure:        -1
 *
 *-------------------------------------------------------------------------
 */
/* Disable warning for "format not a string literal" here -QAK */
/*
 *      This pragma only needs to surround the snprintf() calls with
 *      'newname_individual', etc. in the code below, but early (4.4.7, at least) gcc only
 *      allows diagnostic pragmas to be toggled outside of functions.
 */
H5_GCC_CLANG_DIAG_OFF("format-nonliteral")
static herr_t
test_family_compat(void)
{
    hid_t file = H5I_INVALID_HID, fapl = H5I_INVALID_HID;
    hid_t dset    = H5I_INVALID_HID;
    char  dname[] = "dataset";
    char  filename[1024];
    char  pathname[1024], pathname_individual[1024];
    char  newname[1024], newname_individual[1024];
    int   counter = 0;

    TESTING("FAMILY file driver backward compatibility");

    /* Set property list and file name for FAMILY driver */
    if ((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
        TEST_ERROR;
    if (H5Pset_fapl_family(fapl, (hsize_t)FAMILY_SIZE2, H5P_DEFAULT) < 0)
        TEST_ERROR;

    h5_fixname(COMPAT_BASENAME, fapl, filename, sizeof(filename));
    h5_fixname(FILENAME[3], fapl, newname, sizeof(newname));

    pathname[0] = '\0';
    strcat(pathname, filename);

    /* The following code makes the copies of the family files in the source directory.
     * Since we're going to open the files with write mode, this protects the original
     * files.
     */
    snprintf(newname_individual, sizeof(newname_individual), newname, counter);
    snprintf(pathname_individual, sizeof(pathname_individual), pathname, counter);

    while (h5_make_local_copy(pathname_individual, newname_individual) >= 0) {
        counter++;
        snprintf(newname_individual, sizeof(newname_individual), newname, counter);
        snprintf(pathname_individual, sizeof(pathname_individual), pathname, counter);
    } /* end while */

    /* Make sure we can open the file.  Use the read and write mode to flush the
     * superblock. */
    if ((file = H5Fopen(newname, H5F_ACC_RDWR, fapl)) < 0)
        TEST_ERROR;

    if ((dset = H5Dopen2(file, dname, H5P_DEFAULT)) < 0)
        TEST_ERROR;

    if (H5Dclose(dset) < 0)
        TEST_ERROR;

    if (H5Fclose(file) < 0)
        TEST_ERROR;

    /* Open the file again to make sure it isn't corrupted. */
    if ((file = H5Fopen(newname, H5F_ACC_RDWR, fapl)) < 0)
        TEST_ERROR;

    if ((dset = H5Dopen2(file, dname, H5P_DEFAULT)) < 0)
        TEST_ERROR;

    if (H5Dclose(dset) < 0)
        TEST_ERROR;

    /* Close and delete the file */
    if (H5Fclose(file) < 0)
        TEST_ERROR;
    h5_delete_test_file(FILENAME[3], fapl);

    /* Close the fapl */
    if (H5Pclose(fapl) < 0)
        TEST_ERROR;

    PASSED();

    return 0;

error:
    H5E_BEGIN_TRY
    {
        H5Fclose(file);
        H5Pclose(fapl);
    }
    H5E_END_TRY

    return -1;
} /* end test_family_compat() */
H5_GCC_CLANG_DIAG_ON("format-nonliteral")

/*-------------------------------------------------------------------------
 * Function:    test_family_member_fapl
 *
 * Purpose:     Actually use the member fapl input to the member vfd.
 *
 * Return:      SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
static herr_t
test_family_member_fapl(void)
{
    hid_t    file         = H5I_INVALID_HID;
    hid_t    fapl_id      = H5I_INVALID_HID;
    hid_t    memb_fapl_id = H5I_INVALID_HID;
    hid_t    space        = H5I_INVALID_HID;
    hid_t    dset         = H5I_INVALID_HID;
    char     filename[1024];
    char     dname[]  = "dataset";
    unsigned i        = 0;
    unsigned j        = 0;
    int    **buf      = NULL;
    int     *buf_data = NULL;
    hsize_t  dims[2]  = {FAMILY_NUMBER, FAMILY_SIZE};

    TESTING("Family member FAPL");

    /* Set up data array */
    if (NULL == (buf_data = (int *)calloc(FAMILY_NUMBER * FAMILY_SIZE, sizeof(int))))
        TEST_ERROR;
    if (NULL == (buf = (int **)calloc(FAMILY_NUMBER, sizeof(buf_data))))
        TEST_ERROR;
    for (i = 0; i < FAMILY_NUMBER; i++)
        buf[i] = buf_data + (i * FAMILY_SIZE);

    if ((fapl_id = H5Pcreate(H5P_FILE_ACCESS)) == H5I_INVALID_HID)
        TEST_ERROR;

    if ((memb_fapl_id = H5Pcreate(H5P_FILE_ACCESS)) == H5I_INVALID_HID)
        TEST_ERROR;

    if (H5Pset_fapl_sec2(memb_fapl_id) == FAIL)
        TEST_ERROR;
    if (H5Pset_fapl_family(fapl_id, (hsize_t)FAMILY_SIZE, memb_fapl_id) == FAIL)
        TEST_ERROR;

    h5_fixname(FILENAME[2], fapl_id, filename, sizeof(filename));

    if ((file = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id)) == H5I_INVALID_HID)
        TEST_ERROR;

    if ((space = H5Screate_simple(2, dims, NULL)) == H5I_INVALID_HID)
        TEST_ERROR;

    /* Create and write to dataset, then close file.
     */
    if ((dset = H5Dcreate2(file, dname, H5T_NATIVE_INT, space, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) ==
        H5I_INVALID_HID)
        TEST_ERROR;

    for (i = 0; i < FAMILY_NUMBER; i++) {
        for (j = 0; j < FAMILY_SIZE; j++) {
            buf[i][j] = (int)((i * 10000) + j);
        }
    }

    if (H5Dwrite(dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_data) == FAIL)
        TEST_ERROR;

    if (H5Dclose(dset) == FAIL)
        TEST_ERROR;
    if (H5Sclose(space) == FAIL)
        TEST_ERROR;
    if (H5Fclose(file) == FAIL)
        TEST_ERROR;

    /* "Close" member FAPL at top level and re-open file.
     * Should succeed, with library managing reference count properly
     */
    if (H5Pclose(memb_fapl_id) == FAIL)
        TEST_ERROR;

    if ((file = H5Fopen(filename, H5F_ACC_RDWR, fapl_id)) == H5I_INVALID_HID)
        TEST_ERROR;

    if (H5Fclose(file) == FAIL)
        TEST_ERROR;

    h5_delete_test_file(FILENAME[2], fapl_id);

    if (H5Pclose(fapl_id) == FAIL)
        TEST_ERROR;

    free(buf);
    free(buf_data);

    PASSED();
    return SUCCEED;

error:
    H5E_BEGIN_TRY
    {
        H5Sclose(space);
        H5Dclose(dset);
        H5Pclose(memb_fapl_id);
        H5Pclose(fapl_id);
        H5Fclose(file);
    }
    H5E_END_TRY

    free(buf);
    free(buf_data);

    return FAIL;
} /* end test_family_member_fapl() */

/*-------------------------------------------------------------------------
 * Function:    test_multi_opens
 *
 * Purpose:     Private function for test_multi() to tests wrong ways of
 *              reopening multi file.
 *
 * Return:      SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
/* Disable warning for "format not a string literal" here -QAK */
/*
 *      This pragma only needs to surround the snprintf() calls with
 *      'sf_name' in the code below, but early (4.4.7, at least) gcc only
 *      allows diagnostic pragmas to be toggled outside of functions.
 */
H5_GCC_CLANG_DIAG_OFF("format-nonliteral")
static herr_t
test_multi_opens(char *fname)
{
    hid_t fid = H5I_INVALID_HID;
    char  super_name[1024]; /*name string "%%s-s.h5"*/
    char  sf_name[1024];    /*name string "multi_file-s.h5"*/

    /* Case: reopen with the name of super file and default property list */
    snprintf(super_name, sizeof(super_name), "%%s-%c.h5", 's');
    snprintf(sf_name, sizeof(sf_name), super_name, fname);

    H5E_BEGIN_TRY
    {
        fid = H5Fopen(sf_name, H5F_ACC_RDWR, H5P_DEFAULT);
    }
    H5E_END_TRY

    return (fid >= 0 ? FAIL : SUCCEED);
} /* end test_multi_opens() */
H5_GCC_CLANG_DIAG_ON("format-nonliteral")

/*-------------------------------------------------------------------------
 * Function:    test_multi
 *
 * Purpose:     Tests the file handle interface for MULTI driver
 *
 * Return:      SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
static herr_t
test_multi(void)
{
    hid_t file = H5I_INVALID_HID, fapl = H5I_INVALID_HID, fapl2 = H5I_INVALID_HID, dset = H5I_INVALID_HID,
          space = H5I_INVALID_HID;
    hid_t root = H5I_INVALID_HID, attr = H5I_INVALID_HID, aspace = H5I_INVALID_HID, atype = H5I_INVALID_HID;
    hid_t access_fapl          = H5I_INVALID_HID;
    hid_t driver_id            = H5I_INVALID_HID; /* ID for this VFD              */
    unsigned long driver_flags = 0;               /* VFD feature flags            */
    char          filename[1024];
    int          *fhandle2 = NULL, *fhandle = NULL;
    hsize_t       file_size;
    H5FD_mem_t    mt, memb_map[H5FD_MEM_NTYPES];
    hid_t         memb_fapl[H5FD_MEM_NTYPES];
    haddr_t       memb_addr[H5FD_MEM_NTYPES];
    const char   *memb_name[H5FD_MEM_NTYPES];
    char          sv[H5FD_MEM_NTYPES][32];
    hsize_t       dims[2]  = {MULTI_SIZE, MULTI_SIZE};
    hsize_t       adims[1] = {1};
    char          dname[]  = "dataset";
    char          meta[]   = "this is some metadata on this file";
    int           i, j;
    int         **buf      = NULL;
    int          *buf_data = NULL;

    TESTING("MULTI file driver");

    /* Set up data array */
    if (NULL == (buf_data = (int *)calloc(MULTI_SIZE * MULTI_SIZE, sizeof(int))))
        TEST_ERROR;
    if (NULL == (buf = (int **)calloc(MULTI_SIZE, sizeof(buf_data))))
        TEST_ERROR;
    for (i = 0; i < MULTI_SIZE; i++)
        buf[i] = buf_data + (i * MULTI_SIZE);

    /* Set file access property list for MULTI driver */
    if ((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
        TEST_ERROR;

    memset(memb_map, 0, sizeof(memb_map));
    memset(memb_fapl, 0, sizeof(memb_fapl));
    memset(memb_name, 0, sizeof(memb_name));
    memset(memb_addr, 0, sizeof(memb_addr));
    memset(sv, 0, sizeof(sv));

    for (mt = H5FD_MEM_DEFAULT; mt < H5FD_MEM_NTYPES; mt++) {
        memb_fapl[mt] = H5P_DEFAULT;
        memb_map[mt]  = H5FD_MEM_SUPER;
    }
    memb_map[H5FD_MEM_DRAW]  = H5FD_MEM_DRAW;
    memb_map[H5FD_MEM_BTREE] = H5FD_MEM_BTREE;
    memb_map[H5FD_MEM_GHEAP] = H5FD_MEM_GHEAP;

    snprintf(sv[H5FD_MEM_SUPER], 32, "%%s-%c.h5", 's');
    memb_name[H5FD_MEM_SUPER] = sv[H5FD_MEM_SUPER];
    memb_addr[H5FD_MEM_SUPER] = 0;

    snprintf(sv[H5FD_MEM_BTREE], 32, "%%s-%c.h5", 'b');
    memb_name[H5FD_MEM_BTREE] = sv[H5FD_MEM_BTREE];
    memb_addr[H5FD_MEM_BTREE] = HADDR_MAX / 4;

    snprintf(sv[H5FD_MEM_DRAW], 32, "%%s-%c.h5", 'r');
    memb_name[H5FD_MEM_DRAW] = sv[H5FD_MEM_DRAW];
    memb_addr[H5FD_MEM_DRAW] = HADDR_MAX / 2;

    snprintf(sv[H5FD_MEM_GHEAP], 32, "%%s-%c.h5", 'g');
    memb_name[H5FD_MEM_GHEAP] = sv[H5FD_MEM_GHEAP];
    memb_addr[H5FD_MEM_GHEAP] = (HADDR_MAX / 4) * 3;

    if (H5Pset_fapl_multi(fapl, memb_map, memb_fapl, memb_name, memb_addr, true) < 0)
        TEST_ERROR;
    h5_fixname(FILENAME[4], fapl, filename, sizeof filename);

    /* Check that the VFD feature flags are correct */
    if ((driver_id = H5Pget_driver(fapl)) < 0)
        TEST_ERROR;
    if (H5FDdriver_query(driver_id, &driver_flags) < 0)
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_DATA_SIEVE))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_AGGREGATE_SMALLDATA))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_USE_ALLOC_SIZE))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_PAGED_AGGR))
        TEST_ERROR;
    /* Check for extra flags not accounted for above */
    if (driver_flags != (H5FD_FEAT_DATA_SIEVE | H5FD_FEAT_AGGREGATE_SMALLDATA | H5FD_FEAT_USE_ALLOC_SIZE |
                         H5FD_FEAT_PAGED_AGGR))
        TEST_ERROR;

    if ((file = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0)
        TEST_ERROR;

    if (H5Fclose(file) < 0)
        TEST_ERROR;

    /* Test wrong ways to reopen multi files */
    if (test_multi_opens(filename) < 0)
        TEST_ERROR;

    /* Reopen the file */
    if ((file = H5Fopen(filename, H5F_ACC_RDWR, fapl)) < 0)
        TEST_ERROR;

    /* Create and write data set */
    if ((space = H5Screate_simple(2, dims, NULL)) < 0)
        TEST_ERROR;

    /* Retrieve the access property list... */
    if ((access_fapl = H5Fget_access_plist(file)) < 0)
        TEST_ERROR;

    /* Check that the driver is correct */
    if (H5FD_MULTI != H5Pget_driver(access_fapl))
        TEST_ERROR;

    /* ...and close the property list */
    if (H5Pclose(access_fapl) < 0)
        TEST_ERROR;

    /* Check file size API */
    if (H5Fget_filesize(file, &file_size) < 0)
        TEST_ERROR;

    /* Before any data is written, the raw data file is empty.  So
     * the file size is only the size of b-tree + HADDR_MAX/4.
     */
    if (file_size < HADDR_MAX / 4 || file_size > HADDR_MAX / 2)
        TEST_ERROR;

    if ((dset = H5Dcreate2(file, dname, H5T_NATIVE_INT, space, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0)
        TEST_ERROR;

    for (i = 0; i < MULTI_SIZE; i++)
        for (j = 0; j < MULTI_SIZE; j++)
            buf[i][j] = i * 10000 + j;
    if (H5Dwrite(dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_data) < 0)
        TEST_ERROR;

    if ((fapl2 = H5Pcreate(H5P_FILE_ACCESS)) < 0)
        TEST_ERROR;
    if (H5Pset_multi_type(fapl2, H5FD_MEM_SUPER) < 0)
        TEST_ERROR;
    if (H5Fget_vfd_handle(file, fapl2, (void **)&fhandle) < 0)
        TEST_ERROR;
    if (*fhandle < 0)
        TEST_ERROR;

    if (H5Pset_multi_type(fapl2, H5FD_MEM_DRAW) < 0)
        TEST_ERROR;
    if (H5Fget_vfd_handle(file, fapl2, (void **)&fhandle2) < 0)
        TEST_ERROR;
    if (*fhandle2 < 0)
        TEST_ERROR;

    /* Check file size API */
    if (H5Fget_filesize(file, &file_size) < 0)
        TEST_ERROR;

    /* After the data is written, the file size is huge because the
     * beginning of raw data file is set at HADDR_MAX/2.  It's supposed
     * to be (HADDR_MAX/2 + 128*128*4)
     */
    if (file_size < HADDR_MAX / 2 || file_size > HADDR_MAX)
        TEST_ERROR;

    if (H5Sclose(space) < 0)
        TEST_ERROR;
    if (H5Dclose(dset) < 0)
        TEST_ERROR;
    if (H5Pclose(fapl2) < 0)
        TEST_ERROR;

    /* Create and write attribute for the root group. */
    if ((root = H5Gopen2(file, "/", H5P_DEFAULT)) < 0)
        TEST_ERROR;

    /* Attribute string. */
    if ((atype = H5Tcopy(H5T_C_S1)) < 0)
        TEST_ERROR;

    if (H5Tset_size(atype, strlen(meta) + 1) < 0)
        TEST_ERROR;

    if (H5Tset_strpad(atype, H5T_STR_NULLTERM) < 0)
        TEST_ERROR;

    /* Create and write attribute */
    if ((aspace = H5Screate_simple(1, adims, NULL)) < 0)
        TEST_ERROR;

    if ((attr = H5Acreate2(root, "Metadata", atype, aspace, H5P_DEFAULT, H5P_DEFAULT)) < 0)
        TEST_ERROR;

    if (H5Awrite(attr, atype, meta) < 0)
        TEST_ERROR;

    /* Close IDs */
    if (H5Tclose(atype) < 0)
        TEST_ERROR;
    if (H5Sclose(aspace) < 0)
        TEST_ERROR;
    if (H5Aclose(attr) < 0)
        TEST_ERROR;

    /* Close and delete the file */
    if (H5Fclose(file) < 0)
        TEST_ERROR;
    h5_delete_test_file(FILENAME[4], fapl);

    /* Close the fapl */
    if (H5Pclose(fapl) < 0)
        TEST_ERROR;

    free(buf);
    free(buf_data);

    PASSED();

    return SUCCEED;

error:
    H5E_BEGIN_TRY
    {
        H5Sclose(space);
        H5Dclose(dset);
        H5Pclose(fapl);
        H5Pclose(fapl2);
        H5Fclose(file);
        H5Aclose(attr);
    }
    H5E_END_TRY

    free(buf);
    free(buf_data);

    return FAIL;
} /* end test_multi() */

/*-------------------------------------------------------------------------
 * Function:    test_multi_compat
 *
 * Purpose:     Tests the backward compatibility for MULTI driver.
 *              See if we can open files created with v1.6 library.
 *              The source file was created by the test/file_handle.c
 *              of the v1.6 library.  This test verifies the fix for
 *              Issue 2598. In v1.6 library, there was EOA for the whole
 *              MULTI file saved in the super block.  We took it out in
 *              v1.8 library because it's meaningless for the MULTI file.
 *              v1.8 library saves the EOA for the metadata file, instead.
 *
 * Return:      Success:        0
 *              Failure:        -1
 *
 *-------------------------------------------------------------------------
 */
static herr_t
test_multi_compat(void)
{
    hid_t file = H5I_INVALID_HID, fapl = H5I_INVALID_HID, dset = H5I_INVALID_HID, space = H5I_INVALID_HID;
    char  newname[1024];
    char  filename_s[1024], newname_s[1024];
    char  filename_r[1024], newname_r[1024];
    H5FD_mem_t  mt, memb_map[H5FD_MEM_NTYPES];
    hid_t       memb_fapl[H5FD_MEM_NTYPES];
    haddr_t     memb_addr[H5FD_MEM_NTYPES];
    const char *memb_name[H5FD_MEM_NTYPES];
    char        sv[H5FD_MEM_NTYPES][32];
    hsize_t     dims[2] = {MULTI_SIZE, MULTI_SIZE};
    int         i, j;
    int       **buf      = NULL;
    int        *buf_data = NULL;

    TESTING("MULTI file driver backward compatibility");

    /* Set up data array */
    if (NULL == (buf_data = (int *)calloc(MULTI_SIZE * MULTI_SIZE, sizeof(int))))
        TEST_ERROR;
    if (NULL == (buf = (int **)calloc(MULTI_SIZE, sizeof(buf_data))))
        TEST_ERROR;
    for (i = 0; i < MULTI_SIZE; i++)
        buf[i] = buf_data + (i * MULTI_SIZE);

    /* Set file access property list for MULTI driver */
    if ((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
        TEST_ERROR;

    memset(memb_map, 0, sizeof memb_map);
    memset(memb_fapl, 0, sizeof memb_fapl);
    memset(memb_name, 0, sizeof memb_name);
    memset(memb_addr, 0, sizeof memb_addr);
    memset(sv, 0, sizeof sv);

    for (mt = H5FD_MEM_DEFAULT; mt < H5FD_MEM_NTYPES; mt++)
        memb_map[mt] = H5FD_MEM_SUPER;
    memb_map[H5FD_MEM_DRAW] = H5FD_MEM_DRAW;

    memb_fapl[H5FD_MEM_SUPER] = H5P_DEFAULT;
    snprintf(sv[H5FD_MEM_SUPER], 32, "%%s-%c.h5", 's');
    memb_name[H5FD_MEM_SUPER] = sv[H5FD_MEM_SUPER];
    memb_addr[H5FD_MEM_SUPER] = 0;

    memb_fapl[H5FD_MEM_DRAW] = H5P_DEFAULT;
    snprintf(sv[H5FD_MEM_DRAW], 32, "%%s-%c.h5", 'r');
    memb_name[H5FD_MEM_DRAW] = sv[H5FD_MEM_DRAW];
    memb_addr[H5FD_MEM_DRAW] = HADDR_MAX / 2;

    if (H5Pset_fapl_multi(fapl, memb_map, memb_fapl, memb_name, memb_addr, true) < 0)
        TEST_ERROR;

    h5_fixname(FILENAME[9], fapl, newname, sizeof newname);

    /* Make copy for the data file in the build directory, to protect the
     * original file in the source directory
     */
    snprintf(filename_s, sizeof(filename_s), "%s-%c.h5", MULTI_COMPAT_BASENAME, 's');
    snprintf(newname_s, sizeof(newname_s), "%s-%c.h5", FILENAME[9], 's');
    h5_make_local_copy(filename_s, newname_s);

    snprintf(filename_r, sizeof(filename_r), "%s-%c.h5", MULTI_COMPAT_BASENAME, 'r');
    snprintf(newname_r, sizeof(newname_r), "%s-%c.h5", FILENAME[9], 'r');
    h5_make_local_copy(filename_r, newname_r);

    /* Reopen the file for read only.  Verify 1.8 library can open file
     * created with 1.6 library.
     */
    if ((file = H5Fopen(newname, H5F_ACC_RDONLY, fapl)) < 0)
        TEST_ERROR;

    if ((dset = H5Dopen2(file, DSET1_NAME, H5P_DEFAULT)) < 0)
        TEST_ERROR;

    if (H5Dclose(dset) < 0)
        TEST_ERROR;

    if (H5Fclose(file) < 0)
        TEST_ERROR;

    /* Make sure we can reopen the file for read and write */
    if ((file = H5Fopen(newname, H5F_ACC_RDWR, fapl)) < 0)
        TEST_ERROR;

    if ((dset = H5Dopen2(file, DSET1_NAME, H5P_DEFAULT)) < 0)
        TEST_ERROR;

    if (H5Dclose(dset) < 0)
        TEST_ERROR;

    if (H5Fclose(file) < 0)
        TEST_ERROR;

    /* Reopen the file for adding another dataset. The new EOA for metadata file
     * should be written to the file */
    if ((file = H5Fopen(newname, H5F_ACC_RDWR, fapl)) < 0)
        TEST_ERROR;

    /* Create and write data set */
    if ((space = H5Screate_simple(2, dims, NULL)) < 0)
        TEST_ERROR;

    if ((dset = H5Dcreate2(file, DSET3_NAME, H5T_NATIVE_INT, space, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) <
        0)
        TEST_ERROR;

    for (i = 0; i < MULTI_SIZE; i++)
        for (j = 0; j < MULTI_SIZE; j++)
            buf[i][j] = i * 10000 + j;
    if (H5Dwrite(dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf_data) < 0)
        TEST_ERROR;

    if (H5Dclose(dset) < 0)
        TEST_ERROR;

    if (H5Sclose(space) < 0)
        TEST_ERROR;

    if (H5Fclose(file) < 0)
        TEST_ERROR;

    /* Reopen the file for read only again. Verify the library can handle
     * the EOA correctly */
    if ((file = H5Fopen(newname, H5F_ACC_RDONLY, fapl)) < 0)
        TEST_ERROR;

    if ((dset = H5Dopen2(file, DSET1_NAME, H5P_DEFAULT)) < 0)
        TEST_ERROR;

    if (H5Dclose(dset) < 0)
        TEST_ERROR;

    if ((dset = H5Dopen2(file, DSET3_NAME, H5P_DEFAULT)) < 0)
        TEST_ERROR;

    if (H5Dclose(dset) < 0)
        TEST_ERROR;

    /* Close and delete the file */
    if (H5Fclose(file) < 0)
        TEST_ERROR;
    h5_delete_test_file(FILENAME[9], fapl);

    /* Close the fapl */
    if (H5Pclose(fapl) < 0)
        TEST_ERROR;

    free(buf);
    free(buf_data);

    PASSED();

    return SUCCEED;

error:
    H5E_BEGIN_TRY
    {
        H5Sclose(space);
        H5Dclose(dset);
        H5Pclose(fapl);
        H5Fclose(file);
    }
    H5E_END_TRY

    free(buf);
    free(buf_data);

    return FAIL;
} /* end test_multi_compat() */

/*-------------------------------------------------------------------------
 * Function:    test_log
 *
 * Purpose:     Tests the file handle interface for log driver
 *
 * Return:      Success:        0
 *              Failure:        -1
 *
 *-------------------------------------------------------------------------
 */
static herr_t
test_log(void)
{
    hid_t         file         = H5I_INVALID_HID;
    hid_t         fapl         = H5I_INVALID_HID;
    hid_t         access_fapl  = H5I_INVALID_HID;
    hid_t         driver_id    = H5I_INVALID_HID; /* ID for this VFD              */
    unsigned long driver_flags = 0;               /* VFD feature flags            */
    char          filename[1024];
    int          *fhandle   = NULL;
    hsize_t       file_size = 0;
    unsigned int  flags     = H5FD_LOG_ALL;
    size_t        buf_size  = 4 * KB;
    herr_t        ret       = SUCCEED;

    TESTING("LOG file driver");

    if ((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
        TEST_ERROR;

    /* Make sure calling with an invalid fapl doesn't crash */
    H5E_BEGIN_TRY
    {
        ret = H5Pset_fapl_log(H5I_INVALID_HID, LOG_FILENAME, 0, 0);
    }
    H5E_END_TRY
    if (SUCCEED == ret)
        TEST_ERROR;

    /* Set property list and file name for log driver. */
    if (H5Pset_fapl_log(fapl, LOG_FILENAME, flags, buf_size) < 0)
        TEST_ERROR;
    h5_fixname(FILENAME[6], fapl, filename, sizeof filename);

    /* Check that the VFD feature flags are correct */
    if ((driver_id = H5Pget_driver(fapl)) < 0)
        TEST_ERROR;
    if (H5FDdriver_query(driver_id, &driver_flags) < 0)
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_AGGREGATE_METADATA))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_ACCUMULATE_METADATA))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_DATA_SIEVE))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_AGGREGATE_SMALLDATA))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_POSIX_COMPAT_HANDLE))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_SUPPORTS_SWMR_IO))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_DEFAULT_VFD_COMPATIBLE))
        TEST_ERROR;
    /* Check for extra flags not accounted for above */
    if (driver_flags != (H5FD_FEAT_AGGREGATE_METADATA | H5FD_FEAT_ACCUMULATE_METADATA | H5FD_FEAT_DATA_SIEVE |
                         H5FD_FEAT_AGGREGATE_SMALLDATA | H5FD_FEAT_POSIX_COMPAT_HANDLE |
                         H5FD_FEAT_SUPPORTS_SWMR_IO | H5FD_FEAT_DEFAULT_VFD_COMPATIBLE))
        TEST_ERROR;

    /* Create the test file */
    if ((file = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0)
        TEST_ERROR;

    /* Retrieve the access property list... */
    if ((access_fapl = H5Fget_access_plist(file)) < 0)
        TEST_ERROR;

    /* Check that the driver is correct */
    if (H5FD_LOG != H5Pget_driver(access_fapl))
        TEST_ERROR;

    /* ...and close the property list */
    if (H5Pclose(access_fapl) < 0)
        TEST_ERROR;

    /* Check file handle API */
    if (H5Fget_vfd_handle(file, H5P_DEFAULT, (void **)&fhandle) < 0)
        TEST_ERROR;
    if (*fhandle < 0)
        TEST_ERROR;

    /* Check file size API */
    if (H5Fget_filesize(file, &file_size) < 0)
        TEST_ERROR;

    /* There is no guarantee the size of metadata in file is constant.
     * Just try to check if it's reasonable.  It's 2KB right now.
     */
    if (file_size < 1 * KB || file_size > 4 * KB)
        TEST_ERROR;

    /* Close and delete the file */
    if (H5Fclose(file) < 0)
        TEST_ERROR;
    h5_delete_test_file(FILENAME[6], fapl);

    /* Close the fapl */
    if (H5Pclose(fapl) < 0)
        TEST_ERROR;

    PASSED();
    return 0;

error:
    H5E_BEGIN_TRY
    {
        H5Pclose(fapl);
        H5Fclose(file);
    }
    H5E_END_TRY
    return -1;
}

/*-------------------------------------------------------------------------
 * Function:    test_stdio
 *
 * Purpose:     Tests the file handle interface for STDIO driver
 *
 * Return:      Success:        0
 *              Failure:        -1
 *
 *-------------------------------------------------------------------------
 */
static herr_t
test_stdio(void)
{
    hid_t         file         = H5I_INVALID_HID;
    hid_t         fapl         = H5I_INVALID_HID;
    hid_t         access_fapl  = H5I_INVALID_HID;
    hid_t         driver_id    = H5I_INVALID_HID; /* ID for this VFD              */
    unsigned long driver_flags = 0;               /* VFD feature flags            */
    char          filename[1024];
    FILE         *fhandle   = NULL;
    hsize_t       file_size = 0;

    TESTING("STDIO file driver");

    /* Set property list and file name for STDIO driver. */
    if ((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
        TEST_ERROR;
    if (H5Pset_fapl_stdio(fapl) < 0)
        TEST_ERROR;
    h5_fixname(FILENAME[7], fapl, filename, sizeof filename);

    /* Check that the VFD feature flags are correct */
    if ((driver_id = H5Pget_driver(fapl)) < 0)
        TEST_ERROR;
    if (H5FDdriver_query(driver_id, &driver_flags) < 0)
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_AGGREGATE_METADATA))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_ACCUMULATE_METADATA))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_DATA_SIEVE))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_AGGREGATE_SMALLDATA))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_DEFAULT_VFD_COMPATIBLE))
        TEST_ERROR;
    /* Check for extra flags not accounted for above */
    if (driver_flags != (H5FD_FEAT_AGGREGATE_METADATA | H5FD_FEAT_ACCUMULATE_METADATA | H5FD_FEAT_DATA_SIEVE |
                         H5FD_FEAT_AGGREGATE_SMALLDATA | H5FD_FEAT_DEFAULT_VFD_COMPATIBLE))
        TEST_ERROR;

    if ((file = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0)
        TEST_ERROR;

    /* Retrieve the access property list... */
    if ((access_fapl = H5Fget_access_plist(file)) < 0)
        TEST_ERROR;

    /* Check that the driver is correct */
    if (H5FD_STDIO != H5Pget_driver(access_fapl))
        TEST_ERROR;

    /* ...and close the property list */
    if (H5Pclose(access_fapl) < 0)
        TEST_ERROR;

    /* Check file handle API */
    if (H5Fget_vfd_handle(file, H5P_DEFAULT, (void **)&fhandle) < 0)
        TEST_ERROR;
    if (NULL == fhandle)
        TEST_ERROR;

    /* Check file size API */
    if (H5Fget_filesize(file, &file_size) < 0)
        TEST_ERROR;

    /* There is no guarantee the size of metadata in file is constant.
     * Just try to check if it's reasonable.  It's 2KB right now.
     */
    if (file_size < 1 * KB || file_size > 4 * KB)
        TEST_ERROR;

    /* Close and delete the file */
    if (H5Fclose(file) < 0)
        TEST_ERROR;
    h5_delete_test_file(FILENAME[7], fapl);

    /* Close the fapl */
    if (H5Pclose(fapl) < 0)
        TEST_ERROR;

    PASSED();
    return 0;

error:
    H5E_BEGIN_TRY
    {
        H5Pclose(fapl);
        H5Fclose(file);
    }
    H5E_END_TRY
    return -1;
}

/*-------------------------------------------------------------------------
 * Function:    test_windows
 *
 * Purpose:     Tests the file handle interface for WINDOWS driver
 *
 * Return:      Success:        0
 *              Failure:        -1
 *
 *-------------------------------------------------------------------------
 */
static herr_t
test_windows(void)
{
#ifdef H5_HAVE_WINDOWS

    hid_t         file         = H5I_INVALID_HID;
    hid_t         fapl         = H5I_INVALID_HID;
    hid_t         access_fapl  = H5I_INVALID_HID;
    hid_t         driver_id    = H5I_INVALID_HID; /* ID for this VFD              */
    unsigned long driver_flags = 0;               /* VFD feature flags            */
    char          filename[1024];
    int          *fhandle   = NULL;
    hsize_t       file_size = 0;

#endif /*H5_HAVE_WINDOWS*/

    TESTING("WINDOWS file driver");

#ifndef H5_HAVE_WINDOWS

    SKIPPED();
    return 0;

#else /* H5_HAVE_WINDOWS */

    /* Set property list and file name for WINDOWS driver. */
    if ((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
        TEST_ERROR;
    if (H5Pset_fapl_windows(fapl) < 0)
        TEST_ERROR;
    h5_fixname(FILENAME[8], fapl, filename, sizeof filename);

    /* Check that the VFD feature flags are correct */
    if ((driver_id = H5Pget_driver(fapl)) < 0)
        TEST_ERROR;
    if (H5FDdriver_query(driver_id, &driver_flags) < 0)
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_AGGREGATE_METADATA))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_ACCUMULATE_METADATA))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_DATA_SIEVE))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_AGGREGATE_SMALLDATA))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_POSIX_COMPAT_HANDLE))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_SUPPORTS_SWMR_IO))
        TEST_ERROR;
    if (!(driver_flags & H5FD_FEAT_DEFAULT_VFD_COMPATIBLE))
        TEST_ERROR;
    /* Check for extra flags not accounted for above */
    if (driver_flags != (H5FD_FEAT_AGGREGATE_METADATA | H5FD_FEAT_ACCUMULATE_METADATA | H5FD_FEAT_DATA_SIEVE |
                         H5FD_FEAT_AGGREGATE_SMALLDATA | H5FD_FEAT_POSIX_COMPAT_HANDLE |
                         H5FD_FEAT_SUPPORTS_SWMR_IO | H5FD_FEAT_DEFAULT_VFD_COMPATIBLE))
        TEST_ERROR;

    if ((file = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0)
        TEST_ERROR;

    /* Retrieve the access property list... */
    if ((access_fapl = H5Fget_access_plist(file)) < 0)
        TEST_ERROR;

    /* Check that the driver is correct */
    if (H5FD_WINDOWS != H5Pget_driver(access_fapl))
        TEST_ERROR;

    /* ...and close the property list */
    if (H5Pclose(access_fapl) < 0)
        TEST_ERROR;

    /* Check file handle API */
    if (H5Fget_vfd_handle(file, H5P_DEFAULT, (void **)&fhandle) < 0)
        TEST_ERROR;
    if (*fhandle < 0)
        TEST_ERROR;

    /* Check file size API */
    if (H5Fget_filesize(file, &file_size) < 0)
        TEST_ERROR;

    /* There is no guarantee the size of metadata in file is constant.
     * Just try to check if it's reasonable.  It's 2KB right now.
     */
    if (file_size < 1 * KB || file_size > 4 * KB)
        TEST_ERROR;

    /* Close and delete the file */
    if (H5Fclose(file) < 0)
        TEST_ERROR;
    h5_delete_test_file(FILENAME[8], fapl);

    /* Close the fapl */
    if (H5Pclose(fapl) < 0)
        TEST_ERROR;

    PASSED();
    return 0;

error:
    H5E_BEGIN_TRY
    {
        H5Pclose(fapl);
        H5Fclose(file);
    }
    H5E_END_TRY
    return -1;

#endif /* H5_HAVE_WINDOWS */
} /* end test_windows() */

/*-------------------------------------------------------------------------
 * Function:    test_ros3
 *
 * Purpose:     Tests the file handle interface for the ROS3 driver
 *
 *              As the ROS3 driver is 1) read only, 2) requires access
 *              to an S3 server (minio for now), this test is quite
 *              different from the other tests.
 *
 *              For now, test only fapl & flags.  Extend as the
 *              work on the VFD continues.
 *
 * Return:      Success:        0
 *              Failure:        -1
 *
 *-------------------------------------------------------------------------
 */
static herr_t
test_ros3(void)
{
#ifdef H5_HAVE_ROS3_VFD
    hid_t            fid          = H5I_INVALID_HID; /* file ID                      */
    hid_t            fapl_id      = H5I_INVALID_HID; /* file access property list ID */
    hid_t            fapl_id_out  = H5I_INVALID_HID; /* from H5Fget_access_plist     */
    hid_t            driver_id    = H5I_INVALID_HID; /* ID for this VFD              */
    unsigned long    driver_flags = 0;               /* VFD feature flags            */
    char             filename[1024];                 /* filename                     */
    H5FD_ros3_fapl_t test_ros3_fa;
    H5FD_ros3_fapl_t ros3_fa_0 = {
        /* version      = */ H5FD_CURR_ROS3_FAPL_T_VERSION,
        /* authenticate = */ false,
        /* aws_region   = */ "",
        /* secret_id    = */ "",
        /* secret_key   = */ "plugh",
    };
#endif /*H5_HAVE_ROS3_VFD */

    TESTING("Read-only S3 file driver");

#ifndef H5_HAVE_ROS3_VFD
    SKIPPED();
    return 0;
#else  /* H5_HAVE_ROS3_VFD */

    /* Set property list and file name for ROS3 driver. */
    if ((fapl_id = H5Pcreate(H5P_FILE_ACCESS)) < 0)
        TEST_ERROR;

    if (H5Pset_fapl_ros3(fapl_id, &ros3_fa_0) < 0)
        TEST_ERROR;

    /* verify that the ROS3 FAPL entry is set as expected */
    if (H5Pget_fapl_ros3(fapl_id, &test_ros3_fa) < 0)
        TEST_ERROR;

    /* need a macro to compare instances of H5FD_ros3_fapl_t */
    if ((test_ros3_fa.version != ros3_fa_0.version) ||
        (test_ros3_fa.authenticate != ros3_fa_0.authenticate) ||
        (strcmp(test_ros3_fa.aws_region, ros3_fa_0.aws_region) != 0) ||
        (strcmp(test_ros3_fa.secret_id, ros3_fa_0.secret_id) != 0) ||
        (strcmp(test_ros3_fa.secret_key, ros3_fa_0.secret_key) != 0))
        TEST_ERROR;

    h5_fixname(FILENAME[10], fapl_id, filename, sizeof(filename));

    /* Check that the VFD feature flags are correct */
    if ((driver_id = H5Pget_driver(fapl_id)) < 0)
        TEST_ERROR;

    if (H5FDdriver_query(driver_id, &driver_flags) < 0)
        TEST_ERROR;

    if (!(driver_flags & H5FD_FEAT_DATA_SIEVE))
        TEST_ERROR;

    /* Check for extra flags not accounted for above */
    if (driver_flags != (H5FD_FEAT_DATA_SIEVE))
        TEST_ERROR;

    PASSED();
    return 0;

error:
    H5E_BEGIN_TRY
    {
        H5Pclose(fapl_id);
        H5Pclose(fapl_id_out);
        H5Fclose(fid);
    }
    H5E_END_TRY
    return -1;
#endif /* H5_HAVE_ROS3_VFD */
} /* end test_ros3() */

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 * Macro: SPLITTER_TEST_FAULT()
 *
 * utility macro, helps create stack-like backtrace on error.
 * requires defined in the calling function:
 *    * variable `int ret_value` (return -1 on error)`
 *    * label `done` for exit on fault
 * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 */
#define SPLITTER_TEST_FAULT(mesg)                                                                            \
    do {                                                                                                     \
        H5_FAILED();                                                                                         \
        AT();                                                                                                \
        fprintf(stderr, mesg);                                                                               \
        H5Eprint2(H5E_DEFAULT, stderr);                                                                      \
        fflush(stderr);                                                                                      \
        ret_value = -1;                                                                                      \
        goto done;                                                                                           \
    } while (0)

/*-------------------------------------------------------------------------
 * Function:    compare_splitter_config_info
 *
 * Purpose:     Helper function to compare configuration info found in a
 *              FAPL against a canonical structure.
 *
 * Return:      Success:  0, if config info in FAPL matches info structure.
 *              Failure: -1, if difference detected.
 *
 *-------------------------------------------------------------------------
 */
static int
compare_splitter_config_info(hid_t fapl_id, H5FD_splitter_vfd_config_t *info)
{
    int                         ret_value    = 0;
    H5FD_splitter_vfd_config_t *fetched_info = NULL;

    if (NULL == (fetched_info = calloc(1, sizeof(H5FD_splitter_vfd_config_t))))
        SPLITTER_TEST_FAULT("memory allocation for fetched_info struct failed");

    fetched_info->magic      = H5FD_SPLITTER_MAGIC;
    fetched_info->version    = H5FD_CURR_SPLITTER_VFD_CONFIG_VERSION;
    fetched_info->rw_fapl_id = H5I_INVALID_HID;
    fetched_info->wo_fapl_id = H5I_INVALID_HID;

    if (H5Pget_fapl_splitter(fapl_id, fetched_info) < 0) {
        SPLITTER_TEST_FAULT("can't get splitter info");
    }
    if (info->rw_fapl_id == H5P_DEFAULT) {
        if (H5Pget_driver(fetched_info->rw_fapl_id) != H5Pget_driver(H5P_FILE_ACCESS_DEFAULT)) {
            SPLITTER_TEST_FAULT("Read-Write driver mismatch (default)\n");
        }
    }
    else {
        if (H5Pget_driver(fetched_info->rw_fapl_id) != H5Pget_driver(info->rw_fapl_id)) {
            SPLITTER_TEST_FAULT("Read-Write driver mismatch\n");
        }
    }
    if (info->wo_fapl_id == H5P_DEFAULT) {
        if (H5Pget_driver(fetched_info->wo_fapl_id) != H5Pget_driver(H5P_FILE_ACCESS_DEFAULT)) {
            SPLITTER_TEST_FAULT("Write-Only driver mismatch (default)\n");
        }
    }
    else {
        if (H5Pget_driver(fetched_info->wo_fapl_id) != H5Pget_driver(info->wo_fapl_id)) {
            SPLITTER_TEST_FAULT("Write-Only driver mismatch\n");
        }
    }
    if ((strlen(info->wo_path) != strlen(fetched_info->wo_path)) ||
        strncmp(info->wo_path, fetched_info->wo_path, H5FD_SPLITTER_PATH_MAX) != 0) {
        fprintf(stderr, "MISMATCH: '%s' :: '%s'\n", info->wo_path, fetched_info->wo_path);
        HEXPRINT(H5FD_SPLITTER_PATH_MAX, info->wo_path);
        HEXPRINT(H5FD_SPLITTER_PATH_MAX, fetched_info->wo_path);
        SPLITTER_TEST_FAULT("Write-Only file path mismatch\n");
    }

done:
    free(fetched_info);

    return ret_value;
} /* end compare_splitter_config_info() */

/*-------------------------------------------------------------------------
 * Function:    run_splitter_test
 *
 * Purpose:     Auxiliary function for test_splitter().
 *
 * Return:      Success:        0
 *              Failure:        -1
 *
 * Description:
 *              Perform basic open-write-close with the Splitter VFD.
 *              Prior to operations, removes files from a previous run,
 *              if they exist.
 *              After writing, compares read-write and write-only files.
 *              Includes FAPL sanity testing.
 *
 *-------------------------------------------------------------------------
 */
static int
run_splitter_test(const struct splitter_dataset_def *data, bool ignore_wo_errors, bool provide_logfile_path,
                  const hid_t sub_fapl_ids[2])
{
    hid_t                       file_id     = H5I_INVALID_HID;
    hid_t                       fapl_id     = H5I_INVALID_HID;
    hid_t                       dset_id     = H5I_INVALID_HID;
    hid_t                       space_id    = H5I_INVALID_HID;
    hid_t                       fapl_id_out = H5I_INVALID_HID;
    hid_t                       fapl_id_cpy = H5I_INVALID_HID;
    H5FD_splitter_vfd_config_t *vfd_config  = NULL;
    char                       *filename_rw = NULL;
    FILE                       *logfile     = NULL;
    int                         ret_value   = 0;

    if (NULL == (vfd_config = calloc(1, sizeof(H5FD_splitter_vfd_config_t))))
        SPLITTER_TEST_FAULT("memory allocation for vfd_config struct failed");
    if (NULL == (filename_rw = calloc(H5FD_SPLITTER_PATH_MAX + 1, sizeof(char))))
        SPLITTER_TEST_FAULT("memory allocation for filename_rw string failed");

    vfd_config->magic          = H5FD_SPLITTER_MAGIC;
    vfd_config->version        = H5FD_CURR_SPLITTER_VFD_CONFIG_VERSION;
    vfd_config->ignore_wo_errs = ignore_wo_errors;
    vfd_config->rw_fapl_id     = sub_fapl_ids[0];
    vfd_config->wo_fapl_id     = sub_fapl_ids[1];

    if (splitter_prepare_file_paths(vfd_config, filename_rw) < 0) {
        SPLITTER_TEST_FAULT("can't prepare file paths\n");
    }

    if (provide_logfile_path == false) {
        vfd_config->log_file_path[0] = '\0'; /* reset as empty string */
    }

    /* Create a new fapl to use the SPLITTER file driver */
    if ((fapl_id = H5Pcreate(H5P_FILE_ACCESS)) == H5I_INVALID_HID) {
        SPLITTER_TEST_FAULT("can't create FAPL ID\n");
    }
    if (H5Pset_fapl_splitter(fapl_id, vfd_config) < 0) {
        SPLITTER_TEST_FAULT("can't set splitter FAPL\n");
    }
    if (H5Pget_driver(fapl_id) != H5FD_SPLITTER) {
        SPLITTER_TEST_FAULT("set FAPL not SPLITTER\n");
    }

    if (compare_splitter_config_info(fapl_id, vfd_config) < 0) {
        SPLITTER_TEST_FAULT("information mismatch\n");
    }

    /*
     * Copy property list, light compare, and close the copy.
     * Helps test driver-implemented FAPL-copying and library ID management.
     */

    fapl_id_cpy = H5Pcopy(fapl_id);
    if (H5I_INVALID_HID == fapl_id_cpy) {
        SPLITTER_TEST_FAULT("can't copy FAPL\n");
    }
    if (compare_splitter_config_info(fapl_id_cpy, vfd_config) < 0) {
        SPLITTER_TEST_FAULT("information mismatch\n");
    }
    if (H5Pclose(fapl_id_cpy) < 0) {
        SPLITTER_TEST_FAULT("can't close fapl copy\n");
    }

    /*
     * Proceed with test. Create file.
     */
    file_id = H5Fcreate(filename_rw, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id);
    if (file_id < 0) {
        SPLITTER_TEST_FAULT("can't create file\n");
    }

    /*
     * Check driver from file
     */

    fapl_id_out = H5Fget_access_plist(file_id);
    if (H5I_INVALID_HID == fapl_id_out) {
        SPLITTER_TEST_FAULT("can't get file's FAPL\n");
    }
    if (H5Pget_driver(fapl_id_out) != H5FD_SPLITTER) {
        SPLITTER_TEST_FAULT("wrong file FAPL driver\n");
    }
    if (compare_splitter_config_info(fapl_id_out, vfd_config) < 0) {
        SPLITTER_TEST_FAULT("information mismatch\n");
    }
    if (H5Pclose(fapl_id_out) < 0) {
        SPLITTER_TEST_FAULT("can't close file's FAPL\n");
    }

    /*
     * Create and write the dataset
     */

    space_id = H5Screate_simple(data->n_dims, data->dims, NULL);
    if (space_id < 0) {
        SPLITTER_TEST_FAULT("can't create dataspace\n");
    }
    dset_id = H5Dcreate2(file_id, data->dset_name, data->mem_type_id, space_id, H5P_DEFAULT, H5P_DEFAULT,
                         H5P_DEFAULT);
    if (dset_id < 0) {
        SPLITTER_TEST_FAULT("can't create dataset\n");
    }
    if (H5Dwrite(dset_id, data->mem_type_id, H5S_ALL, H5S_ALL, H5P_DEFAULT, data->buf) < 0) {
        SPLITTER_TEST_FAULT("can't write data to dataset\n");
    }

    /* Close everything */
    if (H5Dclose(dset_id) < 0) {
        SPLITTER_TEST_FAULT("can't close dset\n");
    }
    if (H5Sclose(space_id) < 0) {
        SPLITTER_TEST_FAULT("can't close space\n");
    }
    if (H5Pclose(fapl_id) < 0) {
        SPLITTER_TEST_FAULT("can't close fapl\n");
    }
    if (H5Fclose(file_id) < 0) {
        SPLITTER_TEST_FAULT("can't close file\n");
    }

    /* Verify that the R/W and W/O files are identical */
    if (h5_compare_file_bytes(filename_rw, vfd_config->wo_path) < 0) {
        SPLITTER_TEST_FAULT("files are not byte-for-byte equivalent\n");
    }

    /* Verify existence of logfile if appropriate */
    logfile = fopen(vfd_config->log_file_path, "r");
    if ((true == provide_logfile_path && NULL == logfile) ||
        (false == provide_logfile_path && NULL != logfile)) {
        SPLITTER_TEST_FAULT("no logfile when one was expected\n");
    }

done:
    if (ret_value < 0) {
        H5E_BEGIN_TRY
        {
            H5Dclose(dset_id);
            H5Sclose(space_id);
            H5Pclose(fapl_id_out);
            H5Pclose(fapl_id_cpy);
            H5Pclose(fapl_id);
            H5Fclose(file_id);
        }
        H5E_END_TRY
    }

    if (logfile != NULL)
        fclose(logfile);

    free(vfd_config);
    free(filename_rw);

    return ret_value;
} /* end run_splitter_test() */

/*-------------------------------------------------------------------------
 * Function:    driver_is_splitter_compatible
 *
 * Purpose:     Determine whether the driver set in the FAPL ID is compatible
 *              with the Splitter VFD -- specifically, Write-Only channel.
 *
 * Return:      Success:        0
 *              Failure:        -1
 *
 * Description: Attempts to put the given FAPL ID as the W/O channel.
 *              Uses driver's own mechanisms to generate error, and catches
 *              error.
 *
 *-------------------------------------------------------------------------
 */
static int
driver_is_splitter_compatible(hid_t fapl_id)
{
    H5FD_splitter_vfd_config_t *vfd_config    = NULL;
    hid_t                       split_fapl_id = H5I_INVALID_HID;
    herr_t                      ret           = SUCCEED;
    int                         ret_value     = 0;

    if (NULL == (vfd_config = calloc(1, sizeof(H5FD_splitter_vfd_config_t)))) {
        FAIL_PUTS_ERROR("memory allocation for vfd_config struct failed");
    }

    if (H5I_INVALID_HID == (split_fapl_id = H5Pcreate(H5P_FILE_ACCESS))) {
        FAIL_PUTS_ERROR("Can't create contained FAPL");
    }
    vfd_config->magic          = H5FD_SPLITTER_MAGIC;
    vfd_config->version        = H5FD_CURR_SPLITTER_VFD_CONFIG_VERSION;
    vfd_config->ignore_wo_errs = false;
    vfd_config->rw_fapl_id     = H5P_DEFAULT;
    vfd_config->wo_fapl_id     = fapl_id;
    strncpy(vfd_config->wo_path, "nonesuch", H5FD_SPLITTER_PATH_MAX);
    vfd_config->log_file_path[0] = '\0';

    H5E_BEGIN_TRY
    {
        ret = H5Pset_fapl_splitter(split_fapl_id, vfd_config);
    }
    H5E_END_TRY
    if (SUCCEED == ret) {
        ret_value = -1;
    }

    if (H5Pclose(split_fapl_id) < 0) {
        FAIL_PUTS_ERROR("Can't close contained FAPL");
    }
    split_fapl_id = H5I_INVALID_HID;

    free(vfd_config);

    return ret_value;

error:
    H5E_BEGIN_TRY
    {
        H5Pclose(split_fapl_id);
    }
    H5E_END_TRY

    free(vfd_config);

    return -1;
} /* end driver_is_splitter_compatible() */

/*-------------------------------------------------------------------------
 * Function:    splitter_RO_test
 *
 * Purpose:     Verify Splitter VFD with the Read-Only access flag.
 *
 * Return:      Success:        0
 *              Failure:        -1
 *
 * Description: Attempt read-only opening of files with different
 *              permutations of files already existing on-disk.
 *
 *-------------------------------------------------------------------------
 */
static int
splitter_RO_test(const struct splitter_dataset_def *data, hid_t child_fapl_id)
{
    char                       *filename_rw = NULL;
    H5FD_splitter_vfd_config_t *vfd_config  = NULL;
    hid_t                       fapl_id     = H5I_INVALID_HID;
    hid_t                       file_id     = H5I_INVALID_HID;
    int                         ret_value   = 0;

    if (NULL == (vfd_config = calloc(1, sizeof(H5FD_splitter_vfd_config_t))))
        SPLITTER_TEST_FAULT("memory allocation for vfd_config struct failed");
    if (NULL == (filename_rw = calloc(H5FD_SPLITTER_PATH_MAX + 1, sizeof(char))))
        SPLITTER_TEST_FAULT("memory allocation for filename_rw string failed");

    vfd_config->magic          = H5FD_SPLITTER_MAGIC;
    vfd_config->version        = H5FD_CURR_SPLITTER_VFD_CONFIG_VERSION;
    vfd_config->ignore_wo_errs = false;
    vfd_config->rw_fapl_id     = child_fapl_id;
    vfd_config->wo_fapl_id     = child_fapl_id;

    if (splitter_prepare_file_paths(vfd_config, filename_rw) < 0) {
        SPLITTER_TEST_FAULT("can't prepare splitter file paths\n");
    }

    /* Create a new fapl to use the SPLITTER file driver */
    fapl_id = H5Pcreate(H5P_FILE_ACCESS);
    if (H5I_INVALID_HID == fapl_id) {
        SPLITTER_TEST_FAULT("can't create FAPL ID\n");
    }
    if (H5Pset_fapl_splitter(fapl_id, vfd_config) < 0) {
        SPLITTER_TEST_FAULT("can't set splitter FAPL\n");
    }
    if (H5Pget_driver(fapl_id) != H5FD_SPLITTER) {
        SPLITTER_TEST_FAULT("set FAPL not SPLITTER\n");
    }

    /* Attempt R/O open when both files are nonexistent
     * Should fail.
     */

    H5E_BEGIN_TRY
    {
        file_id = H5Fopen(filename_rw, H5F_ACC_RDONLY, fapl_id);
    }
    H5E_END_TRY
    if (file_id >= 0) {
        SPLITTER_TEST_FAULT("R/O open on nonexistent files unexpectedly successful\n");
    }

    /* Attempt R/O open when only W/O file exists
     * Should fail.
     */

    if (splitter_create_single_file_at(vfd_config->wo_path, vfd_config->wo_fapl_id, data) < 0) {
        SPLITTER_TEST_FAULT("can't write W/O file\n");
    }
    H5E_BEGIN_TRY
    {
        file_id = H5Fopen(filename_rw, H5F_ACC_RDONLY, fapl_id);
    }
    H5E_END_TRY
    if (file_id >= 0) {
        SPLITTER_TEST_FAULT("R/O open with extant W/O file unexpectedly successful\n");
    }
    HDremove(vfd_config->wo_path);

    /* Attempt R/O open when only R/W file exists
     * Should fail.
     */

    if (splitter_create_single_file_at(filename_rw, vfd_config->rw_fapl_id, data) < 0) {
        SPLITTER_TEST_FAULT("can't create R/W file\n");
    }
    H5E_BEGIN_TRY
    {
        file_id = H5Fopen(filename_rw, H5F_ACC_RDONLY, fapl_id);
    }
    H5E_END_TRY
    if (file_id >= 0) {
        SPLITTER_TEST_FAULT("R/O open with extant R/W file unexpectedly successful\n");
    }

    /* Attempt R/O open when both R/W and W/O files exist
     */

    if (splitter_create_single_file_at(vfd_config->wo_path, vfd_config->wo_fapl_id, data) < 0) {
        SPLITTER_TEST_FAULT("can't create W/O file\n");
    }
    file_id = H5Fopen(filename_rw, H5F_ACC_RDONLY, fapl_id);
    if (file_id < 0) {
        SPLITTER_TEST_FAULT("R/O open on two extant files failed\n");
    }
    if (splitter_compare_expected_data(file_id, data) < 0) {
        SPLITTER_TEST_FAULT("data mismatch in R/W file\n");
    }
    if (H5Fclose(file_id) < 0) {
        SPLITTER_TEST_FAULT("can't close file(s)\n");
    }
    file_id = H5I_INVALID_HID;

    /* Cleanup
     */

    if (H5Pclose(fapl_id) < 0) {
        SPLITTER_TEST_FAULT("can't close FAPL ID\n");
    }
    fapl_id = H5I_INVALID_HID;

done:
    if (ret_value < 0) {
        H5E_BEGIN_TRY
        {
            H5Pclose(fapl_id);
            H5Fclose(file_id);
        }
        H5E_END_TRY
    }

    free(vfd_config);
    free(filename_rw);

    return ret_value;
} /* end splitter_RO_test() */

/*-------------------------------------------------------------------------
 * Function:    splitter_prepare_file_paths
 *
 * Purpose:     Get file paths ready for use by the Splitter VFD tests.
 *
 * Return:      Success:        0
 *              Failure:        -1
 *
 * Description:
 *              Use h5_fixname to adjust the splitter-relevant file paths
 *              from those given in FILENAMES.
 *
 *              REMOVES EXISTING FILES AT THE PATH LOCATIONS PRIOR TO RETURN.
 *
 *              The relevant file paths will be set in filename_rw_out and
 *              inside the config structure (wo_path, log_file_path).
 *
 *              `filename_rw_out` must be at least H5FD_SPLITTER_PATH_MAX+1
 *              characters long.
 *
 *              `vfd_config` must have its child FAPL IDs preset.
 *
 *-------------------------------------------------------------------------
 */
static int
splitter_prepare_file_paths(H5FD_splitter_vfd_config_t *vfd_config, char *filename_rw_out)
{
    int ret_value = 0;

    if (vfd_config == NULL || vfd_config->magic != H5FD_SPLITTER_MAGIC) {
        SPLITTER_TEST_FAULT("invalid splitter config pointer\n");
    }
    if (filename_rw_out == NULL) {
        SPLITTER_TEST_FAULT("NULL filename_rw pointer\n");
    }

    /* TODO: sanity-check fapl IDs? */

    /* Build the r/w file, w/o file, and the log file paths.
     * Output is stored in the associated string pointers.
     */
    h5_fixname(FILENAME[11], vfd_config->rw_fapl_id, filename_rw_out, H5FD_SPLITTER_PATH_MAX);
    h5_fixname(FILENAME[12], vfd_config->wo_fapl_id, vfd_config->wo_path, H5FD_SPLITTER_PATH_MAX);
    h5_fixname_no_suffix(FILENAME[13], vfd_config->wo_fapl_id, vfd_config->log_file_path,
                         H5FD_SPLITTER_PATH_MAX);

    /* Delete any existing files on disk.
     */
    HDremove(filename_rw_out);
    HDremove(vfd_config->wo_path);
    HDremove(vfd_config->log_file_path);

done:
    return ret_value;
} /* end splitter_prepare_file_paths() */

/*-------------------------------------------------------------------------
 * Function:    splitter_crate_single_file_at
 *
 * Purpose:     Create a file, optionally w/ dataset.
 *
 * Return:      Success:        0
 *              Failure:        -1
 *
 * Description:
 *              Create a file at the given location with the given FAPL,
 *              and write data as defined in `data` in a pre-determined location in the file.
 *
 *              If the dataset definition pointer is NULL, no data is written
 *              to the file.
 *
 *              Will always overwrite an existing file with the given name/path.
 *
 *-------------------------------------------------------------------------
 */
static int
splitter_create_single_file_at(const char *filename, hid_t fapl_id, const struct splitter_dataset_def *data)
{
    hid_t file_id   = H5I_INVALID_HID;
    hid_t space_id  = H5I_INVALID_HID;
    hid_t dset_id   = H5I_INVALID_HID;
    int   ret_value = 0;

    if (filename == NULL || *filename == '\0') {
        SPLITTER_TEST_FAULT("filename is invalid\n");
    }
    /* TODO: sanity-check fapl id? */

    file_id = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id);
    if (file_id < 0) {
        SPLITTER_TEST_FAULT("can't create file\n");
    }

    if (data) {
        /* TODO: sanity-check data, if it exists? */
        space_id = H5Screate_simple(data->n_dims, data->dims, NULL);
        if (space_id < 0) {
            SPLITTER_TEST_FAULT("can't create dataspace\n");
        }

        dset_id = H5Dcreate2(file_id, data->dset_name, data->mem_type_id, space_id, H5P_DEFAULT, H5P_DEFAULT,
                             H5P_DEFAULT);
        if (dset_id < 0) {
            SPLITTER_TEST_FAULT("can't create dataset\n");
        }

        if (H5Dwrite(dset_id, data->mem_type_id, H5S_ALL, H5S_ALL, H5P_DEFAULT, data->buf) < 0) {
            SPLITTER_TEST_FAULT("can't write data to dataset\n");
        }

        if (H5Dclose(dset_id) < 0) {
            SPLITTER_TEST_FAULT("can't close dset\n");
        }
        if (H5Sclose(space_id) < 0) {
            SPLITTER_TEST_FAULT("can't close space\n");
        }
    } /* end if data definition is provided */

    if (H5Fclose(file_id) < 0) {
        SPLITTER_TEST_FAULT("can't close file\n");
    }

done:
    if (ret_value < 0) {
        H5E_BEGIN_TRY
        {
            H5Dclose(dset_id);
            H5Sclose(space_id);
            H5Fclose(file_id);
        }
        H5E_END_TRY
    } /* end if error */
    return ret_value;
} /* end splitter_create_single_file_at() */

/*-------------------------------------------------------------------------
 * Function:    splitter_compare_expected_data
 *
 * Purpose:     Compare data within a predermined dataset.
 *
 * Return:      Success:        0
 *              Failure:        -1
 *
 * Description: Read data from the file at a predetermined location, and
 *              compare its contents byte-for-byte with that expected in
 *              the `data` definition structure.
 *
 *-------------------------------------------------------------------------
 */
static int
splitter_compare_expected_data(hid_t file_id, const struct splitter_dataset_def *data)
{
    hid_t  dset_id = H5I_INVALID_HID;
    int    buf[SPLITTER_SIZE][SPLITTER_SIZE];
    int    expected[SPLITTER_SIZE][SPLITTER_SIZE];
    size_t i         = 0;
    size_t j         = 0;
    int    ret_value = 0;

    if (sizeof((void *)buf) != sizeof(data->buf)) {
        SPLITTER_TEST_FAULT("invariant size of expected data does not match that received!\n");
    }
    memcpy(expected, data->buf, sizeof(expected));

    dset_id = H5Dopen2(file_id, data->dset_name, H5P_DEFAULT);
    if (dset_id < 0) {
        SPLITTER_TEST_FAULT("can't open dataset\n");
    }

    if (H5Dread(dset_id, data->mem_type_id, H5S_ALL, H5S_ALL, H5P_DEFAULT, (void *)buf) < 0) {
        SPLITTER_TEST_FAULT("can't read dataset\n");
    }

    for (i = 0; i < SPLITTER_SIZE; i++) {
        for (j = 0; j < SPLITTER_SIZE; j++) {
            if (buf[i][j] != expected[i][j]) {
                SPLITTER_TEST_FAULT("mismatch in expected data\n");
            }
        }
    }

    if (H5Dclose(dset_id) < 0) {
        SPLITTER_TEST_FAULT("can't close dataset\n");
    }

done:
    if (ret_value < 0) {
        H5E_BEGIN_TRY
        {
            H5Dclose(dset_id);
        }
        H5E_END_TRY
    }
    return ret_value;
} /* end splitter_compare_expected_data() */

/*-------------------------------------------------------------------------
 * Function:    splitter_tentative_open_test()
 *
 * Purpose:     Verifies Splitter behavior with "tentative" H5F_open.
 *
 * Return:      Success:        0
 *              Failure:        -1
 *
 * Description:
 *              H5F_open() has a two-stage opening process when given a
 *              Read/Write access flag -- first it performs a "tentative
 *              open", where it checks to see whether files already exist
 *              on the system, done in such a way as to not "alter its state"
 *              (i.e., truncate).
 *              This can cause problems with the Splitter VFD, as the
 *              file on the R/W channel might exist already, but that on the
 *              W/O channel will not, and vice-versa.
 *
 *              This test exists to verify that in any event, files will be
 *              created as required.
 *
 *-------------------------------------------------------------------------
 */
static int
splitter_tentative_open_test(hid_t child_fapl_id)
{
    const char                 *filename_tmp = "splitter_tmp.h5";
    char                       *filename_rw  = NULL;
    H5FD_splitter_vfd_config_t *vfd_config   = NULL;
    hid_t                       fapl_id      = H5I_INVALID_HID;
    hid_t                       file_id      = H5I_INVALID_HID;
    int                         buf[SPLITTER_SIZE][SPLITTER_SIZE];        /* for comparison */
    hsize_t                     dims[2] = {SPLITTER_SIZE, SPLITTER_SIZE}; /* for comparison */
    int                         i       = 0;                              /* for comparison */
    int                         j       = 0;                              /* for comparison */
    struct splitter_dataset_def data;                                     /* for comparison */
    int                         ret_value = 0;

    if (NULL == (vfd_config = calloc(1, sizeof(H5FD_splitter_vfd_config_t))))
        SPLITTER_TEST_FAULT("memory allocation for vfd_config struct failed");
    if (NULL == (filename_rw = calloc(H5FD_SPLITTER_PATH_MAX + 1, sizeof(char))))
        SPLITTER_TEST_FAULT("memory allocation for filename_rw string failed");

    /* pre-fill data buffer to write */
    for (i = 0; i < SPLITTER_SIZE; i++) {
        for (j = 0; j < SPLITTER_SIZE; j++) {
            buf[i][j] = i * 100 + j;
        }
    }

    /* Dataset info */
    data.buf         = (void *)buf;
    data.mem_type_id = H5T_NATIVE_INT;
    data.dims        = dims;
    data.n_dims      = 2;
    data.dset_name   = SPLITTER_DATASET_NAME;

    vfd_config->magic          = H5FD_SPLITTER_MAGIC;
    vfd_config->version        = H5FD_CURR_SPLITTER_VFD_CONFIG_VERSION;
    vfd_config->ignore_wo_errs = false;
    vfd_config->rw_fapl_id     = child_fapl_id;
    vfd_config->wo_fapl_id     = child_fapl_id;

    if (splitter_prepare_file_paths(vfd_config, filename_rw) < 0) {
        SPLITTER_TEST_FAULT("can't prepare splitter file paths\n");
    }

    /* Create a new fapl to use the SPLITTER file driver */
    if ((fapl_id = H5Pcreate(H5P_FILE_ACCESS)) == H5I_INVALID_HID) {
        SPLITTER_TEST_FAULT("can't create FAPL ID\n");
    }
    if (H5Pset_fapl_splitter(fapl_id, vfd_config) < 0) {
        SPLITTER_TEST_FAULT("can't set splitter FAPL\n");
    }
    if (H5Pget_driver(fapl_id) != H5FD_SPLITTER) {
        SPLITTER_TEST_FAULT("set FAPL not SPLITTER\n");
    }

    /* Create instance of file on disk.
     * Will be copied verbatim as needed, to avoid issues where differences in
     * the creation time would befoul comparisons.
     */
    if (splitter_create_single_file_at(filename_tmp, child_fapl_id, &data) < 0) {
        SPLITTER_TEST_FAULT("can't write W/O file\n");
    }

    /*
     * H5Fopen() with RDWR access.
     * Neither file exist already
     * Should fail.
     */

    H5E_BEGIN_TRY
    {
        file_id = H5Fopen(filename_rw, H5F_ACC_RDWR, fapl_id);
    }
    H5E_END_TRY
    if (file_id != H5I_INVALID_HID) {
        SPLITTER_TEST_FAULT("open with both nonexistent files unexpectedly succeeded\n");
    }
    if (file_exists(filename_rw, child_fapl_id)) {
        SPLITTER_TEST_FAULT("R/W file unexpectedly created\n");
    }
    if (file_exists(vfd_config->wo_path, child_fapl_id)) {
        SPLITTER_TEST_FAULT("W/O file unexpectedly created\n");
    }

    /*
     * H5Fopen() with RDWR access.
     * Only W/O file present.
     * Should fail.
     */

    if (h5_duplicate_file_by_bytes(filename_tmp, vfd_config->wo_path) < 0) {
        SPLITTER_TEST_FAULT("Can't create W/O file copy.\n");
    }
    H5E_BEGIN_TRY
    {
        file_id = H5Fopen(filename_rw, H5F_ACC_RDWR, fapl_id);
    }
    H5E_END_TRY
    if (file_id != H5I_INVALID_HID) {
        SPLITTER_TEST_FAULT("open with nonexistent R/W file unexpectedly succeeded\n");
    }
    if (file_exists(filename_rw, child_fapl_id)) {
        SPLITTER_TEST_FAULT("R/W file unexpectedly created\n");
    }
    if (!file_exists(vfd_config->wo_path, child_fapl_id)) {
        SPLITTER_TEST_FAULT("W/O file mysteriously disappeared\n");
    }
    HDremove(vfd_config->wo_path);
    if (file_exists(vfd_config->wo_path, child_fapl_id)) {
        SPLITTER_TEST_FAULT("failed to remove W/O file\n");
    }

    /*
     * H5Fopen() with RDWR access.
     * Only R/W file present.
     * Should fail.
     */

    if (h5_duplicate_file_by_bytes(filename_tmp, filename_rw) < 0) {
        SPLITTER_TEST_FAULT("Can't create R/W file copy.\n");
    }
    H5E_BEGIN_TRY
    {
        file_id = H5Fopen(filename_rw, H5F_ACC_RDWR, fapl_id);
    }
    H5E_END_TRY
    if (file_id != H5I_INVALID_HID) {
        SPLITTER_TEST_FAULT("open with nonexistent W/O unexpectedly succeeded\n");
    }
    if (!file_exists(filename_rw, child_fapl_id)) {
        SPLITTER_TEST_FAULT("R/W file mysteriously disappeared\n");
    }
    if (file_exists(vfd_config->wo_path, child_fapl_id)) {
        SPLITTER_TEST_FAULT("W/O file unexpectedly created\n");
    }

    /*
     * H5Fopen() with RDWR access.
     * Both files present.
     */

    if (h5_duplicate_file_by_bytes(filename_tmp, vfd_config->wo_path) < 0) {
        SPLITTER_TEST_FAULT("Can't create W/O file copy.\n");
    }
    file_id = H5Fopen(filename_rw, H5F_ACC_RDWR, fapl_id);
    if (file_id == H5I_INVALID_HID) {
        SPLITTER_TEST_FAULT("file-open failed with both present\n");
    }
    /* Open successful; close file then inspect presence again */
    if (H5Fclose(file_id) < 0) {
        SPLITTER_TEST_FAULT("can't close file ID\n");
    }
    if (!file_exists(filename_rw, child_fapl_id)) {
        SPLITTER_TEST_FAULT("R/W file mysteriously disappeared\n");
    }
    if (!file_exists(vfd_config->wo_path, child_fapl_id)) {
        SPLITTER_TEST_FAULT("W/O file mysteriously disappeared\n");
    }

    /*
     * H5Fcreate() with TRUNC access.
     * Both files present.
     */

    file_id = H5Fcreate(filename_rw, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id);
    if (file_id == H5I_INVALID_HID) {
        SPLITTER_TEST_FAULT("file-open failed with both present\n");
    }
    /* Open successful; close file then inspect presence again */
    if (H5Fclose(file_id) < 0) {
        SPLITTER_TEST_FAULT("can't close file ID\n");
    }
    if (!file_exists(filename_rw, child_fapl_id)) {
        SPLITTER_TEST_FAULT("R/W file mysteriously disappeared\n");
    }
    if (!file_exists(vfd_config->wo_path, child_fapl_id)) {
        SPLITTER_TEST_FAULT("W/O file mysteriously disappeared\n");
    }
    if (h5_compare_file_bytes(filename_rw, vfd_config->wo_path) < 0) {
        SPLITTER_TEST_FAULT("files are not byte-for-byte equivalent\n");
    }
    HDremove(filename_rw);
    HDremove(vfd_config->wo_path);

    /*
     * H5Fcreate() with TRUNC access.
     * R/W already exists.
     */

    if (h5_duplicate_file_by_bytes(filename_tmp, filename_rw) < 0) {
        SPLITTER_TEST_FAULT("Can't create R/W file copy.\n");
    }
    if (file_exists(vfd_config->wo_path, child_fapl_id)) {
        SPLITTER_TEST_FAULT("failed to remove W/O file\n");
    }
    file_id = H5Fcreate(filename_rw, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id);
    if (file_id == H5I_INVALID_HID) {
        SPLITTER_TEST_FAULT("file-open failed with both present\n");
    }
    /* Open successful; close file then inspect presence again */
    if (H5Fclose(file_id) < 0) {
        SPLITTER_TEST_FAULT("can't close file ID\n");
    }
    if (!file_exists(filename_rw, child_fapl_id)) {
        SPLITTER_TEST_FAULT("R/W file mysteriously disappeared\n");
    }
    if (!file_exists(vfd_config->wo_path, child_fapl_id)) {
        SPLITTER_TEST_FAULT("W/O file mysteriously disappeared\n");
    }
    if (h5_compare_file_bytes(filename_rw, vfd_config->wo_path) < 0) {
        SPLITTER_TEST_FAULT("files are not byte-for-byte equivalent\n");
    }
    HDremove(filename_rw);
    HDremove(vfd_config->wo_path);

    /*
     * H5Fcreate() with TRUNC access.
     * Only W/O present.
     */

    if (h5_duplicate_file_by_bytes(filename_tmp, vfd_config->wo_path) < 0) {
        SPLITTER_TEST_FAULT("Can't create W/O file copy.\n");
    }
    if (file_exists(filename_rw, child_fapl_id)) {
        SPLITTER_TEST_FAULT("failed to remove R/W file\n");
    }
    file_id = H5Fcreate(filename_rw, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id);
    if (file_id == H5I_INVALID_HID) {
        SPLITTER_TEST_FAULT("file-open failed with both present\n");
    }
    /* Open successful; close file then inspect presence again */
    if (H5Fclose(file_id) < 0) {
        SPLITTER_TEST_FAULT("can't close file ID\n");
    }
    if (!file_exists(filename_rw, child_fapl_id)) {
        SPLITTER_TEST_FAULT("R/W file mysteriously disappeared\n");
    }
    if (!file_exists(vfd_config->wo_path, child_fapl_id)) {
        SPLITTER_TEST_FAULT("W/O file mysteriously disappeared\n");
    }
    if (h5_compare_file_bytes(filename_rw, vfd_config->wo_path) < 0) {
        SPLITTER_TEST_FAULT("files are not byte-for-byte equivalent\n");
    }
    HDremove(filename_rw);
    HDremove(vfd_config->wo_path);

    /* H5Fcreate with both files absent is tested elsewhere */

    /*
     * Cleanup
     */

    if (H5Pclose(fapl_id) < 0) {
        SPLITTER_TEST_FAULT("can't close splitter FAPL ID\n");
    }

done:
    if (ret_value < 0) {
        H5E_BEGIN_TRY
        {
            H5Pclose(fapl_id);
            H5Fclose(file_id);
        }
        H5E_END_TRY
    }

    free(vfd_config);
    free(filename_rw);

    return ret_value;
} /* end splitter_tentative_open_test() */

/*-------------------------------------------------------------------------
 * Function:    file_exists()
 *
 * Purpose:     Determine whether a file exists on-system
 *
 * Return:      Non-zero (1) if it exists (H5Fopen successful),
 *              zero (0) if absent (cannot be opened).
 *
 * Description: Attempt H5Fopen with the given FAPL ID and RDONLY access flag.
 *
 *-------------------------------------------------------------------------
 */
static int
file_exists(const char *filename, hid_t fapl_id)
{
    hid_t file_id   = H5I_INVALID_HID;
    int   ret_value = 0;

    H5E_BEGIN_TRY
    {
        file_id = H5Fopen(filename, H5F_ACC_RDONLY, fapl_id);
    }
    H5E_END_TRY
    if (file_id != H5I_INVALID_HID) {
        ret_value = 1;
        if (H5Fclose(file_id) < 0) {
            FAIL_PUTS_ERROR("can't close file ID\n");
        }
    }

    return ret_value;

error:
    H5E_BEGIN_TRY
    {
        H5Fclose(file_id);
    }
    H5E_END_TRY
    return ret_value;
} /* end file_exists() */

/*-------------------------------------------------------------------------
 * Function:    test_splitter
 *
 * Purpose:     Tests the Splitter VFD
 *
 * Return:      Success:        0
 *              Failure:        -1
 *
 * Description:
 *              This test function uses the Splitter VFD to produce a r/w
 *              file and a w/o file. It will verify that the two files
 *              are identical.
 *
 *-------------------------------------------------------------------------
 */
static herr_t
test_splitter(void)
{
    int                         buf[SPLITTER_SIZE][SPLITTER_SIZE];
    hsize_t                     dims[2]       = {SPLITTER_SIZE, SPLITTER_SIZE};
    hid_t                       child_fapl_id = H5I_INVALID_HID;
    int                         i             = 0;
    int                         j             = 0;
    struct splitter_dataset_def data;

    TESTING("SPLITTER file driver");

    /* pre-fill data buffer to write */
    for (i = 0; i < SPLITTER_SIZE; i++) {
        for (j = 0; j < SPLITTER_SIZE; j++) {
            buf[i][j] = i * 100 + j;
        }
    }

    /* Dataset info */
    data.buf         = (void *)buf;
    data.mem_type_id = H5T_NATIVE_INT;
    data.dims        = dims;
    data.n_dims      = 2;
    data.dset_name   = SPLITTER_DATASET_NAME;

    /* Stand-in for manual FAPL creation
     * Enables verification with arbitrary VFDs via `make check-vfd`
     */
    child_fapl_id = h5_fileaccess();
    if (child_fapl_id < 0) {
        TEST_ERROR;
    }

    if (!driver_is_splitter_compatible(child_fapl_id)) {
        SKIPPED();
        printf("  given driver is not Splitter W/O compatible.\n");
        return 0;
    }

    /* Test Read-Only access, including when a file on the W/O channel
     * does not exist.
     */
    if (splitter_RO_test(&data, child_fapl_id) < 0) {
        TEST_ERROR;
    }

    /* Test opening of files when the W/O channel does not exist.
     */
    if (splitter_tentative_open_test(child_fapl_id) < 0) {
        TEST_ERROR;
    }

    /* Test file creation, utilizing different child FAPLs (default vs.
     * specified), logfile, and Write Channel error ignoring behavior.
     */
    for (i = 0; i < 4; i++) {
        bool  ignore_wo_errors     = (i & 1) ? true : false;
        bool  provide_logfile_path = (i & 2) ? true : false;
        hid_t child_fapl_ids[2]    = {H5P_DEFAULT, H5P_DEFAULT};

        /* Test child driver definition/default combination */
        for (j = 0; j < 4; j++) {

            child_fapl_ids[0] = (j & 1) ? child_fapl_id : H5P_DEFAULT;
            child_fapl_ids[1] = (j & 2) ? child_fapl_id : H5P_DEFAULT;

            if (run_splitter_test(&data, ignore_wo_errors, provide_logfile_path, child_fapl_ids) < 0) {
                TEST_ERROR;
            }

        } /* end for child fapl definition/pairing */

    } /* end for behavior-flag loops */

    /* TODO: SWMR open? */
    /* Concurrent opens with both drivers using the Splitter */

    if (H5Pclose(child_fapl_id) == FAIL) {
        TEST_ERROR;
    }

    PASSED();
    return 0;

error:
    if (child_fapl_id != H5I_INVALID_HID)
        H5Pclose(child_fapl_id);

    return -1;
} /* end test_splitter() */

#undef SPLITTER_TEST_FAULT

/*****************************************************************************
 *
 * Function    setup_rand()
 *
 * Purpose:    Use gettimeofday() to obtain a seed for rand(), print the
 *             seed to stdout, and then pass it to srand().
 *
 *             This is a version of the same routine in
 *             testpar/t_cache.c modified for use in serial tests.
 *
 * Return:     void.
 *
 *****************************************************************************/
static void
setup_rand(void)
{
    bool           use_predefined_seed = false;
    unsigned       predefined_seed     = 18669;
    unsigned       seed;
    struct timeval tv;

    if (use_predefined_seed) {

        seed = predefined_seed;

        fprintf(stdout, "\n%s: predefined_seed = %d.\n\n", __func__, seed);
        fflush(stdout);

        HDsrand(seed);
    }
    else {

        if (HDgettimeofday(&tv, NULL) != 0) {

            fprintf(stdout, "\n%s: gettimeofday() failed -- srand() not called.\n\n", __func__);
            fflush(stdout);
        }
        else {

            seed = (unsigned)tv.tv_usec;

            fprintf(stdout, "\n%s: seed = %d.\n\n", __func__, seed);
            fflush(stdout);

            HDsrand(seed);
        }
    }

    return;

} /* setup_rand() */

/*
 * Callback implementations for ctl feature testing VFD
 */
static H5FD_t *
H5FD__ctl_test_vfd_open(const char H5_ATTR_UNUSED *name, unsigned H5_ATTR_UNUSED flags,
                        hid_t H5_ATTR_UNUSED fapl_id, haddr_t H5_ATTR_UNUSED maxaddr)
{
    return calloc(1, sizeof(H5FD_t));
}
static herr_t
H5FD__ctl_test_vfd_close(H5FD_t H5_ATTR_UNUSED *_file)
{
    free(_file);
    return SUCCEED;
}
static haddr_t
H5FD__ctl_test_vfd_get_eoa(const H5FD_t H5_ATTR_UNUSED *file, H5FD_mem_t H5_ATTR_UNUSED type)
{
    return HADDR_UNDEF;
}
static herr_t
H5FD__ctl_test_vfd_set_eoa(H5FD_t H5_ATTR_UNUSED *_file, H5FD_mem_t H5_ATTR_UNUSED type,
                           haddr_t H5_ATTR_UNUSED addr)
{
    return FAIL;
}
static haddr_t
H5FD__ctl_test_vfd_get_eof(const H5FD_t H5_ATTR_UNUSED *file, H5FD_mem_t H5_ATTR_UNUSED type)
{
    return HADDR_UNDEF;
}
static herr_t
H5FD__ctl_test_vfd_read(H5FD_t H5_ATTR_UNUSED *_file, H5FD_mem_t H5_ATTR_UNUSED type,
                        hid_t H5_ATTR_UNUSED fapl_id, haddr_t H5_ATTR_UNUSED addr, size_t H5_ATTR_UNUSED size,
                        void H5_ATTR_UNUSED *buf)
{
    return FAIL;
}
static herr_t
H5FD__ctl_test_vfd_write(H5FD_t H5_ATTR_UNUSED *_file, H5FD_mem_t H5_ATTR_UNUSED type,
                         hid_t H5_ATTR_UNUSED fapl_id, haddr_t H5_ATTR_UNUSED addr,
                         size_t H5_ATTR_UNUSED size, const void H5_ATTR_UNUSED *buf)
{
    return FAIL;
}
static herr_t
H5FD__ctl_test_vfd_ctl(H5FD_t H5_ATTR_UNUSED *_file, uint64_t op_code, uint64_t flags,
                       const void H5_ATTR_UNUSED *input, void H5_ATTR_UNUSED **output)
{
    herr_t ret_value = SUCCEED;

    switch (op_code) {
        /* Op code for testing purposes */
        case H5FD_CTL_TEST_OPCODE:
            break;

        /* Unknown op code */
        default:
            if (flags & H5FD_CTL_FAIL_IF_UNKNOWN_FLAG)
                ret_value = FAIL;
            break;
    }

    return ret_value;
}

/* Minimal VFD for ctl feature tests */
static const H5FD_class_t H5FD_ctl_test_vfd_g = {
    H5FD_CLASS_VERSION,         /* struct version        */
    (H5FD_class_value_t)201,    /* value                 */
    "ctl_test_vfd",             /* name                  */
    HADDR_MAX,                  /* maxaddr               */
    H5F_CLOSE_SEMI,             /* fc_degree             */
    NULL,                       /* terminate             */
    NULL,                       /* sb_size               */
    NULL,                       /* sb_encode             */
    NULL,                       /* sb_decode             */
    0,                          /* fapl_size             */
    NULL,                       /* fapl_get              */
    NULL,                       /* fapl_copy             */
    NULL,                       /* fapl_free             */
    0,                          /* dxpl_size             */
    NULL,                       /* dxpl_copy             */
    NULL,                       /* dxpl_free             */
    H5FD__ctl_test_vfd_open,    /* open                  */
    H5FD__ctl_test_vfd_close,   /* close                 */
    NULL,                       /* cmp                   */
    NULL,                       /* query                 */
    NULL,                       /* get_type_map          */
    NULL,                       /* alloc                 */
    NULL,                       /* free                  */
    H5FD__ctl_test_vfd_get_eoa, /* get_eoa               */
    H5FD__ctl_test_vfd_set_eoa, /* set_eoa               */
    H5FD__ctl_test_vfd_get_eof, /* get_eof               */
    NULL,                       /* get_handle            */
    H5FD__ctl_test_vfd_read,    /* read                  */
    H5FD__ctl_test_vfd_write,   /* write                 */
    NULL,                       /* read_vector           */
    NULL,                       /* write_vector          */
    NULL,                       /* read_selection        */
    NULL,                       /* write_selection       */
    NULL,                       /* flush                 */
    NULL,                       /* truncate              */
    NULL,                       /* lock                  */
    NULL,                       /* unlock                */
    NULL,                       /* del                   */
    H5FD__ctl_test_vfd_ctl,     /* ctl                   */
    H5FD_FLMAP_DICHOTOMY        /* fl_map                */
};

/*-------------------------------------------------------------------------
 * Function:    run_ctl_test
 *
 * Purpose:     Helper method for VFD "ctl" callback test
 *
 * Return:      Non-negative on success/Negative on failure
 *
 *-------------------------------------------------------------------------
 */
static herr_t
run_ctl_test(uint64_t op_code, uint64_t flags, ctl_test_opc_type opc_type, hid_t fapl_id)
{
    bool    fail_if_unknown    = false;
    bool    routing_flag_set   = false;
    bool    is_passthrough_vfd = false;
    bool    expect_fail        = false;
    H5FD_t *file_drv_ptr       = NULL;
    herr_t  ctl_result         = SUCCEED;
    hid_t   driver_id          = H5I_INVALID_HID;
    char    filename[1024];

    /* Check for a few ctl function flags */
    fail_if_unknown  = (flags & H5FD_CTL_FAIL_IF_UNKNOWN_FLAG);
    routing_flag_set = (flags & H5FD_CTL_ROUTE_TO_TERMINAL_VFD_FLAG);

    /* Determine if the top-level VFD is a passthrough VFD */
    if ((driver_id = H5Pget_driver(fapl_id)) < 0)
        PUTS_ERROR("couldn't get VFD ID from FAPL");

    is_passthrough_vfd = ((driver_id == H5FD_SPLITTER) || (driver_id == H5FD_MULTI));

    /*
     * "Open" testing file. Note that our VFD for testing the ctl
     * feature doesn't actually create or open files, so we don't
     * need to create the testing file; we just need the VFD to
     * give us a pointer to a H5FD_t structure.
     */
    h5_fixname(FILENAME[14], fapl_id, filename, sizeof(filename));
    if (NULL == (file_drv_ptr = H5FDopen(filename, H5F_ACC_RDWR, fapl_id, HADDR_UNDEF)))
        PUTS_ERROR("couldn't get pointer to H5FD_t structure");

    /* Determine whether the H5FDctl call is expected to fail */
    expect_fail = fail_if_unknown && (CTL_OPC_UNKNOWN == opc_type);
    if (is_passthrough_vfd) {
        /* Should fail if op code is unknown to passthrough VFD
         * (but known to terminal VFD), no routing flag is specified
         * and the "fail if unknown" flag is specified.
         */
        expect_fail =
            expect_fail || ((CTL_OPC_KNOWN_TERMINAL == opc_type) && !routing_flag_set && fail_if_unknown);
    }

    /* Issue opcode to VFD */
    if (expect_fail) {
        H5E_BEGIN_TRY
        {
            ctl_result = H5FDctl(file_drv_ptr, op_code, flags, NULL, NULL);
        }
        H5E_END_TRY
    }
    else
        ctl_result = H5FDctl(file_drv_ptr, op_code, flags, NULL, NULL);

    /* Verify result of H5FDctl call */
    if (expect_fail) {
        if (ctl_result == SUCCEED)
            PUTS_ERROR("H5FDctl call succeeded when it should have failed");
    }
    else {
        if (ctl_result != SUCCEED)
            PUTS_ERROR("H5FDctl call failed when it should have succeeded");
    }

    /* Close H5FD_t structure pointer */
    if (H5FDclose(file_drv_ptr) < 0)
        PUTS_ERROR("couldn't close H5FD_t structure pointer");
    file_drv_ptr = NULL;

    return 0;

error:
    H5E_BEGIN_TRY
    {
        H5FDclose(file_drv_ptr);
    }
    H5E_END_TRY

    return -1;
}

/*-------------------------------------------------------------------------
 * Function:    test_ctl
 *
 * Purpose:     Tests the VFD "ctl" callback
 *
 * Return:      Non-negative on success/Negative on failure
 *
 *-------------------------------------------------------------------------
 */
static herr_t
test_ctl(void)
{
    H5FD_splitter_vfd_config_t *splitter_config = NULL;
    uint64_t                    op_code;
    uint64_t                    flags;
    hid_t                       driver_id   = H5I_INVALID_HID;
    hid_t                       fapl_id     = H5I_INVALID_HID;
    hid_t                       sub_fapl_id = H5I_INVALID_HID;

    TESTING("VFD ctl callback");
    puts("");

    /* Register VFD for test */
    if ((driver_id = H5FDregister(&H5FD_ctl_test_vfd_g)) < 0)
        PUTS_ERROR("couldn't register VFD for testing");

    if ((fapl_id = H5Pcreate(H5P_FILE_ACCESS)) < 0)
        PUTS_ERROR("couldn't create FAPL");
    if (H5Pset_driver(fapl_id, driver_id, NULL) < 0)
        PUTS_ERROR("couldn't set testing VFD on FAPL");

    TESTING_2("known op code to terminal VFD (without fail on unknown flag)");

    op_code = H5FD_CTL_TEST_OPCODE;
    flags   = 0;

    /* H5FDctl call should succeed normally */
    if (run_ctl_test(op_code, flags, CTL_OPC_KNOWN_TERMINAL, fapl_id) < 0)
        TEST_ERROR;

    PASSED();

    TESTING_2("known op code to terminal VFD (with fail on unknown flag)");

    op_code = H5FD_CTL_TEST_OPCODE;
    flags   = H5FD_CTL_FAIL_IF_UNKNOWN_FLAG;

    /* H5FDctl call should succeed normally */
    if (run_ctl_test(op_code, flags, CTL_OPC_KNOWN_TERMINAL, fapl_id) < 0)
        TEST_ERROR;

    PASSED();

    TESTING_2("known op code to terminal VFD (without fail on unknown flag/route to terminal VFD)");

    op_code = H5FD_CTL_TEST_OPCODE;
    flags   = H5FD_CTL_ROUTE_TO_TERMINAL_VFD_FLAG;

    /* H5FDctl call should succeed normally */
    if (run_ctl_test(op_code, flags, CTL_OPC_KNOWN_TERMINAL, fapl_id) < 0)
        TEST_ERROR;

    PASSED();

    TESTING_2("known op code to terminal VFD (with fail on unknown flag/route to terminal VFD)");

    op_code = H5FD_CTL_TEST_OPCODE;
    flags   = H5FD_CTL_FAIL_IF_UNKNOWN_FLAG | H5FD_CTL_ROUTE_TO_TERMINAL_VFD_FLAG;

    /* H5FDctl call should succeed normally */
    if (run_ctl_test(op_code, flags, CTL_OPC_KNOWN_TERMINAL, fapl_id) < 0)
        TEST_ERROR;

    PASSED();

    TESTING_2("unknown op code to terminal VFD (without fail on unknown flag)");

    op_code = H5FD_CTL_OPC_RESERVED;
    flags   = 0;

    /* H5FDctl call should silently ignore unknown op code and succeed */
    if (run_ctl_test(op_code, flags, CTL_OPC_UNKNOWN, fapl_id) < 0)
        TEST_ERROR;

    PASSED();

    TESTING_2("unknown op code to terminal VFD (with fail on unknown flag)");

    op_code = H5FD_CTL_OPC_RESERVED;
    flags   = H5FD_CTL_FAIL_IF_UNKNOWN_FLAG;

    /* H5FDctl call should fail due to 'fail if unknown' flag being specified */
    if (run_ctl_test(op_code, flags, CTL_OPC_UNKNOWN, fapl_id) < 0)
        TEST_ERROR;

    PASSED();

    TESTING_2("unknown op code to terminal VFD (without fail on unknown flag/route to terminal VFD)");

    op_code = H5FD_CTL_OPC_RESERVED;
    flags   = H5FD_CTL_ROUTE_TO_TERMINAL_VFD_FLAG;

    /* H5FDctl call should silently ignore unknown op code and succeed */
    if (run_ctl_test(op_code, flags, CTL_OPC_UNKNOWN, fapl_id) < 0)
        TEST_ERROR;

    PASSED();

    TESTING_2("unknown op code to terminal VFD (with fail on unknown flag/route to terminal VFD)");

    op_code = H5FD_CTL_OPC_RESERVED;
    flags   = H5FD_CTL_FAIL_IF_UNKNOWN_FLAG | H5FD_CTL_ROUTE_TO_TERMINAL_VFD_FLAG;

    /* H5FDctl call should fail due to 'fail if unknown' flag being specified */
    if (run_ctl_test(op_code, flags, CTL_OPC_UNKNOWN, fapl_id) < 0)
        TEST_ERROR;

    PASSED();

    /* Set up splitter VFD config */
    if (NULL == (splitter_config = calloc(1, sizeof(H5FD_splitter_vfd_config_t))))
        TEST_ERROR;

    splitter_config->magic          = H5FD_SPLITTER_MAGIC;
    splitter_config->version        = H5FD_CURR_SPLITTER_VFD_CONFIG_VERSION;
    splitter_config->ignore_wo_errs = true;
    splitter_config->rw_fapl_id     = H5P_DEFAULT;
    splitter_config->wo_fapl_id     = H5P_DEFAULT;
    h5_fixname(FILENAME[15], splitter_config->wo_fapl_id, splitter_config->wo_path, H5FD_SPLITTER_PATH_MAX);

    if ((sub_fapl_id = H5Pcreate(H5P_FILE_ACCESS)) < 0)
        PUTS_ERROR("couldn't create FAPL");
    if (H5Pset_driver(sub_fapl_id, driver_id, NULL) < 0)
        PUTS_ERROR("couldn't set testing VFD on FAPL");
    splitter_config->rw_fapl_id = sub_fapl_id;

    if (H5Pset_fapl_splitter(fapl_id, splitter_config) < 0)
        PUTS_ERROR("couldn't set splitter VFD on FAPL");

    TESTING_2("known op code through passthrough VFD to terminal VFD (without fail on unknown flag/no "
              "routing flag)");

    op_code = H5FD_CTL_TEST_OPCODE;
    flags   = 0;

    /*
     * H5FDctl call should silently ignore unknown op code in
     * passthrough VFD since no routing flag is specified and
     * 'fail if unknown' flag is not specified.
     */
    if (run_ctl_test(op_code, flags, CTL_OPC_KNOWN_TERMINAL, fapl_id) < 0)
        TEST_ERROR;

    PASSED();

    TESTING_2(
        "known op code through passthrough VFD to terminal VFD (with fail on unknown flag/no routing flag)");

    op_code = H5FD_CTL_TEST_OPCODE;
    flags   = H5FD_CTL_FAIL_IF_UNKNOWN_FLAG;

    /*
     * H5FDctl call should fail since op code is unknown to
     * passthrough VFD (though known to terminal VFD), no
     * routing flag is specified and the 'fail if unknown'
     * flag is specified.
     */
    if (run_ctl_test(op_code, flags, CTL_OPC_KNOWN_TERMINAL, fapl_id) < 0)
        TEST_ERROR;

    PASSED();

    TESTING_2("known op code through passthrough VFD to terminal VFD (without fail on unknown flag/route to "
              "terminal VFD)");

    op_code = H5FD_CTL_TEST_OPCODE;
    flags   = H5FD_CTL_ROUTE_TO_TERMINAL_VFD_FLAG;

    /*
     * H5Dctl call should succeed since the passthrough VFD
     * doesn't recognize the op code, but has been instructed
     * to route it down to the terminal VFD.
     */
    if (run_ctl_test(op_code, flags, CTL_OPC_KNOWN_TERMINAL, fapl_id) < 0)
        TEST_ERROR;

    PASSED();

    TESTING_2("known op code through passthrough VFD to terminal VFD (with fail on unknown flag/route to "
              "terminal VFD)");

    op_code = H5FD_CTL_TEST_OPCODE;
    flags   = H5FD_CTL_FAIL_IF_UNKNOWN_FLAG | H5FD_CTL_ROUTE_TO_TERMINAL_VFD_FLAG;

    /*
     * H5Dctl call should succeed since the passthrough VFD
     * doesn't recognize the op code, but has been instructed
     * to route it down to the terminal VFD.
     */
    if (run_ctl_test(op_code, flags, CTL_OPC_KNOWN_TERMINAL, fapl_id) < 0)
        TEST_ERROR;

    PASSED();

    TESTING_2("unknown op code to passthrough VFD (without fail on unknown flag)");

    op_code = H5FD_CTL_OPC_RESERVED;
    flags   = 0;

    /*
     * H5FDctl call should silently ignore unknown op code in
     * passthrough VFD since no routing flag is specified and
     * 'fail if unknown' flag is not specified.
     */
    if (run_ctl_test(op_code, flags, CTL_OPC_UNKNOWN, fapl_id) < 0)
        TEST_ERROR;

    PASSED();

    TESTING_2("unknown op code to passthrough VFD (with fail on unknown flag)");

    op_code = H5FD_CTL_OPC_RESERVED;
    flags   = H5FD_CTL_FAIL_IF_UNKNOWN_FLAG;

    /*
     * H5FDctl call should fail since op code is unknown to
     * passthrough VFD, no routing flag is specified and the
     * 'fail if unknown' flag is specified.
     */
    if (run_ctl_test(op_code, flags, CTL_OPC_UNKNOWN, fapl_id) < 0)
        TEST_ERROR;

    PASSED();

    TESTING_2("unknown op code to passthrough VFD (without fail on unknown flag/route to terminal VFD)");

    op_code = H5FD_CTL_OPC_RESERVED;
    flags   = H5FD_CTL_ROUTE_TO_TERMINAL_VFD_FLAG;

    /*
     * H5Dctl call should succeed since the passthrough VFD
     * doesn't recognize the op code, but has been instructed
     * to route it down to the terminal VFD and the 'fail if
     * unknown' flag has not been specified. Therefore, the
     * terminal VFD should silently ignore the unknown op
     * code.
     */
    if (run_ctl_test(op_code, flags, CTL_OPC_UNKNOWN, fapl_id) < 0)
        TEST_ERROR;

    PASSED();

    TESTING_2("unknown op code to passthrough VFD (with fail on unknown flag/route to terminal VFD)");

    op_code = H5FD_CTL_OPC_RESERVED;
    flags   = H5FD_CTL_FAIL_IF_UNKNOWN_FLAG | H5FD_CTL_ROUTE_TO_TERMINAL_VFD_FLAG;

    /*
     * H5Dctl call should fail since the passthrough VFD
     * doesn't recognize the op code, but has been instructed
     * to route it down to the terminal VFD and the 'fail if
     * unknown' flag has been specified. Therefore, the
     * terminal VFD will throw an error for the unknown op
     * code.
     */
    if (run_ctl_test(op_code, flags, CTL_OPC_UNKNOWN, fapl_id) < 0)
        TEST_ERROR;

    PASSED();

    TESTING_2("test cleanup");

    free(splitter_config);

    if (H5FDunregister(driver_id) < 0)
        TEST_ERROR;
    if (H5Pclose(sub_fapl_id) < 0)
        TEST_ERROR;
    if (H5Pclose(fapl_id) < 0)
        TEST_ERROR;

    PASSED();

    return 0;

error:
    H5E_BEGIN_TRY
    {
        if (splitter_config)
            free(splitter_config);
        H5FDunregister(driver_id);
        H5Pclose(sub_fapl_id);
        H5Pclose(fapl_id);
    }
    H5E_END_TRY

    return -1;
}

/*-------------------------------------------------------------------------
 * Function:    test_vector_io__setup_v
 *
 * Purpose:     Construct and initialize a vector of I/O requests used
 *              to test vector I/O.  Note that while the vectors are
 *              allocated and initialized, they are not assigned
 *              base addresses.
 *
 *              All arrays parameters are presumed to be of length
 *              count.
 *
 * Return:      Return true if successful, and false if any errors
 *              are encountered.
 *
 *-------------------------------------------------------------------------
 */

static bool
test_vector_io__setup_v(uint32_t count, H5FD_mem_t types[], haddr_t addrs[], size_t sizes[],
                        const void *write_bufs[], void *read_bufs[], char base_fill_char)
{
    bool       result    = true; /* will set to false on failure */
    char       fill_char = base_fill_char;
    void      *temp_buf  = NULL;
    uint32_t   i;
    uint32_t   j;
    H5FD_mem_t mem_types[6] = {H5FD_MEM_SUPER, H5FD_MEM_BTREE, H5FD_MEM_DRAW,
                               H5FD_MEM_GHEAP, H5FD_MEM_LHEAP, H5FD_MEM_OHDR};

    /* set the arrays of pointers to the write and read buffers to NULL,
     * so that we can release memory on failure.
     */
    for (i = 0; i < count; i++) {

        write_bufs[i] = NULL;
        read_bufs[i]  = NULL;
    }

    for (i = 0; i < count; i++) {
        types[i] = mem_types[i % 6];

        addrs[i] = HADDR_UNDEF;

        sizes[i] = (size_t)((rand() & 1023) + 1);

        temp_buf     = malloc(sizes[i] + 1);
        read_bufs[i] = malloc(sizes[i] + 1);

        if ((NULL == temp_buf) || (NULL == read_bufs[i])) {

            fprintf(stderr, "%s: can't malloc read / write bufs.\n", __func__);
            result = false;
            break;
        }

        for (j = 0; j < sizes[i]; j++) {

            ((char *)temp_buf)[j]       = fill_char;
            ((char *)(read_bufs[i]))[j] = '\0';
        }

        ((char *)temp_buf)[sizes[i]]       = '\0';
        ((char *)(read_bufs[i]))[sizes[i]] = '\0';

        write_bufs[i] = (const void *)temp_buf;
        temp_buf      = NULL;

        fill_char++;
    }

    if (!result) { /* free buffers */

        free(temp_buf);

        for (i = 0; i < count; i++) {

            if (write_bufs[i]) {

                h5_free_const(write_bufs[i]);
                write_bufs[i] = NULL;
            }

            if (read_bufs[i]) {

                free(read_bufs[i]);
                read_bufs[i] = NULL;
            }
        }
    }

    return (result);

} /* end test_vector_io__setup_v() */

/*-------------------------------------------------------------------------
 * Function:    test_vector_io__setup_fixed_size_v
 *
 * Purpose:     To test the optimization allowing short sizes and types
 *              arrays, construct and initialize a vector of I/O requests
 *              with each request of the same size and type, and use the
 *              optimizatin to allow reduced length sizes and types
 *              vectors.  Since the function is supplied with types and
 *              sizes vectors of length count, simulate shorter vectors
 *              by initializing the sizes and types vectors to values
 *              that will cause failure if used.
 *
 *              All arrays parameters are presumed to be of length
 *              count. Count is presumed to be a power of 2, and at
 *              least 2.
 *
 * Return:      Return true if successful, and false if any errors
 *              are encountered.
 *
 *-------------------------------------------------------------------------
 */

static bool
test_vector_io__setup_fixed_size_v(uint32_t count, H5FD_mem_t types[], haddr_t addrs[], size_t sizes[],
                                   const void *write_bufs[], void *read_bufs[], char base_fill_char)
{
    bool       result    = true; /* will set to false on failure */
    char       fill_char = base_fill_char;
    void      *temp_buf  = NULL;
    uint32_t   fix_point;
    uint32_t   i;
    uint32_t   j;
    uint32_t   k;
    H5FD_mem_t mem_types[6] = {H5FD_MEM_SUPER, H5FD_MEM_BTREE, H5FD_MEM_DRAW,
                               H5FD_MEM_GHEAP, H5FD_MEM_LHEAP, H5FD_MEM_OHDR};

    /* set the arrays of pointers to the write and read buffers to NULL,
     * so that we can release memory on failure.
     *
     * Set the types[] and sizes[] arrays to invalid / improbable values
     * so that use of these values will trigger failures.
     */
    for (i = 0; i < count; i++) {

        write_bufs[i] = NULL;
        read_bufs[i]  = NULL;
        types[i]      = H5FD_MEM_NTYPES;
        sizes[i]      = SIZE_MAX;
    }

    /* randomly select the point in the vector after which all entries are
     * fixed at the same size and type.  Observe that 0 <= fix_point <
     * count / 2.
     */
    fix_point = ((uint32_t)rand() & (count - 1)) / 2;

    assert(fix_point < count / 2);

    for (i = 0; i < count; i++) {

        if (i <= fix_point) {

            types[i] = mem_types[i % 6];

            addrs[i] = HADDR_UNDEF;

            sizes[i] = (size_t)((rand() & 1023) + 1);

            temp_buf     = malloc(sizes[i] + 1);
            read_bufs[i] = malloc(sizes[i] + 1);
        }
        else {

            if (i == fix_point + 1) {

                /* set the sentinels that indicate that all remaining
                 * types and sizes are the same as the previous value.
                 */
                types[i] = H5FD_MEM_NOLIST;
                sizes[i] = 0;
            }

            addrs[i] = HADDR_UNDEF;

            temp_buf     = malloc(sizes[fix_point] + 1);
            read_bufs[i] = malloc(sizes[fix_point] + 1);
        }

        if ((NULL == temp_buf) || (NULL == read_bufs[i])) {

            fprintf(stderr, "%s: can't malloc read / write bufs.\n", __func__);
            result = false;
            break;
        }

        /* need to avoid examining sizes beyond the fix_point */
        k = MIN(i, fix_point);

        for (j = 0; j < sizes[k]; j++) {

            ((char *)temp_buf)[j]       = fill_char;
            ((char *)(read_bufs[i]))[j] = '\0';
        }

        ((char *)temp_buf)[sizes[k]]       = '\0';
        ((char *)(read_bufs[i]))[sizes[k]] = '\0';

        write_bufs[i] = (const void *)temp_buf;
        temp_buf      = NULL;

        fill_char++;
    }

    if (!result) { /* free buffers */

        free(temp_buf);

        for (i = 0; i < count; i++) {

            if (write_bufs[i]) {

                h5_free_const(write_bufs[i]);
                write_bufs[i] = NULL;
            }

            if (read_bufs[i]) {

                free(read_bufs[i]);
                read_bufs[i] = NULL;
            }
        }
    }

    return (result);

} /* end test_vector_io__setup_fixed_size_v() */

/*-------------------------------------------------------------------------
 * Function:    test_vector_io__read_v_indiv
 *
 * Purpose:     Read the supplied vector as a sequence of individual
 *              reads.
 *
 *              All arrays parameters are presumed to be of length
 *              count.
 *
 * Return:      Return true if successful, and false if any errors
 *              are encountered.
 *
 *-------------------------------------------------------------------------
 */

static bool
test_vector_io__read_v_indiv(H5FD_t *lf, uint32_t count, H5FD_mem_t types[], haddr_t addrs[], size_t sizes[],
                             void *read_bufs[])
{
    bool       size_fixed = false;
    bool       type_fixed = false;
    bool       result     = true; /* will set to false on failure */
    bool       verbose    = false;
    uint32_t   i;
    size_t     size = SIZE_MAX;
    H5FD_mem_t type = H5FD_MEM_NTYPES;

    for (i = 0; i < count; i++) {

        SET_SIZE(size_fixed, sizes, size, i);

        SET_TYPE(type_fixed, types, type, i);

        if (H5FDread(lf, type, H5P_DEFAULT, addrs[i], size, read_bufs[i]) < 0) {

            if (verbose) {

                fprintf(stdout, "%s: H5FDread() failed on entry %d.\n", __func__, i);
            }
            result = false;
            break;
        }
    }

    return (result);

} /* end test_vector_io__read_v_indiv() */

/*-------------------------------------------------------------------------
 * Function:    test_vector_io__write_v_indiv
 *
 * Purpose:     Write the supplied vector as a sequence of individual
 *              writes.
 *
 *              All arrays parameters are presumed to be of length
 *              count.
 *
 * Return:      Return true if successful, and false if any errors
 *              are encountered.
 *
 *-------------------------------------------------------------------------
 */

static bool
test_vector_io__write_v_indiv(H5FD_t *lf, uint32_t count, H5FD_mem_t types[], haddr_t addrs[], size_t sizes[],
                              const void *write_bufs[])
{
    bool       size_fixed = false;
    bool       type_fixed = false;
    bool       result     = true; /* will set to false on failure */
    bool       verbose    = false;
    uint32_t   i;
    size_t     size = SIZE_MAX;
    H5FD_mem_t type = H5FD_MEM_NTYPES;

    for (i = 0; i < count; i++) {

        SET_SIZE(size_fixed, sizes, size, i);

        SET_TYPE(type_fixed, types, type, i);

        if (H5FDwrite(lf, type, H5P_DEFAULT, addrs[i], size, write_bufs[i]) < 0) {

            if (verbose) {

                fprintf(stdout, "%s: HDwrite() failed on entry %d.\n", __func__, i);
            }
            result = false;
            break;
        }
    }

    return (result);

} /* end test_vector_io__write_v_indiv() */

/*-------------------------------------------------------------------------
 *
 * Function:    test_vector_io__verify_v
 *
 * Purpose:     Verify that the read and write buffers of the supplied
 *              vectors are identical.
 *
 * Return:      true if the read and write vectors are identical, and
 *              false otherwise.
 *
 *-------------------------------------------------------------------------
 */

static bool
test_vector_io__verify_v(uint32_t count, H5FD_mem_t types[], size_t sizes[], const void *write_bufs[],
                         void *read_bufs[], const char *name)
{
    bool        size_fixed = false;
    bool        type_fixed = false;
    bool        identical  = true;
    bool        verbose    = true;
    uint32_t    i;
    size_t      j;
    const char *w_buf;
    char       *r_buf;
    const char *mem_type_names[7] = {"H5FD_MEM_DEFAULT", "H5FD_MEM_SUPER", "H5FD_MEM_BTREE", "H5FD_MEM_DRAW",
                                     "H5FD_MEM_GHEAP",   "H5FD_MEM_LHEAP", "H5FD_MEM_OHDR"};
    size_t      size              = SIZE_MAX;
    H5FD_mem_t  type              = H5FD_MEM_NTYPES;

    i = 0;

    while ((i < count) && (identical)) {

        SET_SIZE(size_fixed, sizes, size, i);

        SET_TYPE(type_fixed, types, type, i);

        w_buf = (const char *)(write_bufs[i]);
        r_buf = (char *)(read_bufs[i]);

        j = 0;
        while ((j < size) && (identical)) {

            if (w_buf[j] != r_buf[j]) {

                identical = false;

                if (verbose) {

                    fprintf(stdout, "\n\nread/write buf mismatch in vector/entry");
                    fprintf(stdout, "\"%s\"/%u at offset %llu/%llu w/r = %c/%c type = %s\n\n", name,
                            (unsigned)i, (long long unsigned)j, (long long unsigned)size, w_buf[j], r_buf[j],
                            mem_type_names[type]);
                }
            }
            j++;
        }
        i++;
    }

    return (identical);

} /* end test_vector_io__verify_v() */

/*-------------------------------------------------------------------------
 *
 * Function:    test_vector_io__dump_test_vectors
 *
 * Purpose:     Print a set of test vectors to stdout.
 *              Vectors are assumed to be of length count, and
 *              buffers must be either NULL, or null terminate strings
 *              of char.
 *
 * Return:      void.
 *
 *-------------------------------------------------------------------------
 */

static void
test_vector_io__dump_test_vectors(uint32_t count, H5FD_mem_t types[], haddr_t addrs[], size_t sizes[],
                                  const void *write_bufs[], void *read_bufs[], const char *name)
{
    bool        size_fixed = false;
    bool        type_fixed = false;
    uint32_t    i;
    const char *mem_type_names[7] = {"H5FD_MEM_DEFAULT", "H5FD_MEM_SUPER", "H5FD_MEM_BTREE", "H5FD_MEM_DRAW",
                                     "H5FD_MEM_GHEAP",   "H5FD_MEM_LHEAP", "H5FD_MEM_OHDR"};
    size_t      size              = SIZE_MAX;
    H5FD_mem_t  type              = H5FD_MEM_NTYPES;

    const char *w_buf;
    char       *r_buf;

    fprintf(stdout, "\n\nDumping test vector \"%s\" of length %d\n\n", name, count);

    for (i = 0; i < count; i++) {

        SET_SIZE(size_fixed, sizes, size, i);

        SET_TYPE(type_fixed, types, type, i);

        assert((H5FD_MEM_DEFAULT <= type) && (type <= H5FD_MEM_OHDR));

        w_buf = (const char *)(write_bufs[i]);

        if (read_bufs) {

            r_buf = (char *)(read_bufs[i]);
        }
        else {

            r_buf = NULL;
        }

        fprintf(stdout, "%u: addr/len = %llu/%llu, type = %s, w_buf = \"%s\"\n", (unsigned)i,
                (long long unsigned)(addrs[i]), (long long unsigned)(size), mem_type_names[type], w_buf);

        if (r_buf) {

            fprintf(stdout, " r_buf = \"%s\"\n", r_buf);
        }
    }

    return;

} /* end test_vector_io__dump_test_vectors() */

/*-------------------------------------------------------------------------
 * Function:    test_vector_io
 *
 * Purpose:     Test I/O using the vector I/O VFD public VFD calls.
 *
 *              Test proceeds as follows:
 *
 *              1) read / write vectors and verify results
 *
 *              2) write individual / read vector and verify results
 *
 *              3) write vector / read individual and verify results
 *
 *              4) Close and then re-open the file, verify data written
 *                 above.
 *
 * Return:      Success:        0
 *              Failure:        -1
 *
 *-------------------------------------------------------------------------
 */
#define VECTOR_LEN 16

static herr_t
test_vector_io(const char *vfd_name)
{
    char        test_title[80];
    bool        size_fixed_0 = false; /* whether remaining entry      */
    bool        size_fixed_1 = false; /* sizes in vector are fixed.   */
    bool        size_fixed_2 = false; /*                              */
    bool        type_fixed_0 = false; /* whether remaining entry      */
    bool        type_fixed_1 = false; /* types in vector are fixed.   */
    bool        type_fixed_2 = false; /*                              */
    bool        verbose      = false;
    hid_t       fapl_id      = H5I_INVALID_HID; /* file access property list ID */
    haddr_t     eoa;                            /* file eoa                     */
    char        filename[1024];                 /* filename                     */
    char       *buf;                            /* tmp ptr to buf               */
    unsigned    flags = 0;                      /* file open flags              */
    H5FD_t     *lf    = NULL;                   /* VFD struct ptr               */
    uint32_t    i;                              /* index                        */
    uint32_t    j;                              /* index                        */
    uint32_t    count = VECTOR_LEN;             /* length of vectors            */
    H5FD_mem_t  types_0[VECTOR_LEN];            /* types vector                 */
    H5FD_mem_t  types_1[VECTOR_LEN];            /* types vector                 */
    H5FD_mem_t  types_2[VECTOR_LEN];            /* types vector                 */
    H5FD_mem_t  f_types_0[VECTOR_LEN];          /* fixed types vector           */
    H5FD_mem_t  f_types_1[VECTOR_LEN];          /* fixed types vector           */
    H5FD_mem_t  f_types_2[VECTOR_LEN];          /* fixed types vector           */
    H5FD_mem_t  f_type_0 = H5FD_MEM_NTYPES;     /* current type for f vector 0  */
    H5FD_mem_t  f_type_1 = H5FD_MEM_NTYPES;     /* current type for f vector 1  */
    H5FD_mem_t  f_type_2 = H5FD_MEM_NTYPES;     /* current type for f vector 2  */
    haddr_t     addrs_0[VECTOR_LEN];            /* addresses vector             */
    haddr_t     addrs_1[VECTOR_LEN];            /* addresses vector             */
    haddr_t     addrs_2[VECTOR_LEN];            /* addresses vector             */
    haddr_t     f_addrs_0[VECTOR_LEN];          /* fixed addresses vector       */
    haddr_t     f_addrs_1[VECTOR_LEN];          /* fixed addresses vector       */
    haddr_t     f_addrs_2[VECTOR_LEN];          /* fixed addresses vector       */
    size_t      sizes_0[VECTOR_LEN];            /* sizes vector                 */
    size_t      sizes_1[VECTOR_LEN];            /* sizes vector                 */
    size_t      sizes_2[VECTOR_LEN];            /* sizes vector                 */
    size_t      f_sizes_0[VECTOR_LEN];          /* fixed sizes vector           */
    size_t      f_sizes_1[VECTOR_LEN];          /* fixed sizes vector           */
    size_t      f_sizes_2[VECTOR_LEN];          /* fixed sizes vector           */
    size_t      f_size_0 = 0;                   /* current size for f vector 0  */
    size_t      f_size_1 = 0;                   /* current size for f vector 1  */
    size_t      f_size_2 = 0;                   /* current size for f vector 2  */
    const void *write_bufs_0[VECTOR_LEN];       /* write bufs vector            */
    const void *write_bufs_1[VECTOR_LEN];       /* write bufs vector            */
    const void *write_bufs_2[VECTOR_LEN];       /* write bufs vector            */
    const void *f_write_bufs_0[VECTOR_LEN];     /* fixed write bufs vector      */
    const void *f_write_bufs_1[VECTOR_LEN];     /* fixed write bufs vector      */
    const void *f_write_bufs_2[VECTOR_LEN];     /* fixed write bufs vector      */
    void       *read_bufs_0[VECTOR_LEN];        /* read bufs vector             */
    void       *read_bufs_1[VECTOR_LEN];        /* read bufs vector             */
    void       *read_bufs_2[VECTOR_LEN];        /* read bufs vector             */
    void       *f_read_bufs_0[VECTOR_LEN];      /* fixed read bufs vector       */
    void       *f_read_bufs_1[VECTOR_LEN];      /* fixed read bufs vector       */
    void       *f_read_bufs_2[VECTOR_LEN];      /* fixed read bufs vector       */

    snprintf(test_title, sizeof(test_title), "vector I/O with %s VFD", vfd_name);

    TESTING(test_title);

    /* Set property list and file name for target driver */

    if ((fapl_id = H5Pcreate(H5P_FILE_ACCESS)) < 0)
        TEST_ERROR;

    if (strcmp(vfd_name, "sec2") == 0) {

        if (H5Pset_fapl_sec2(fapl_id) < 0)
            TEST_ERROR;

        h5_fixname(FILENAME[0], fapl_id, filename, sizeof(filename));
    }
    else if (strcmp(vfd_name, "stdio") == 0) {

        if (H5Pset_fapl_stdio(fapl_id) < 0)
            TEST_ERROR;

        h5_fixname(FILENAME[7], fapl_id, filename, sizeof filename);
    }
    else {

        fprintf(stdout, "un-supported VFD\n");
        TEST_ERROR;
    }

    /* setup the test vectors -- note that addresses are not set until
     * we allocate space via the file driver.
     */
    if (!(test_vector_io__setup_v(count, types_0, addrs_0, sizes_0, write_bufs_0, read_bufs_0, 'a') &&
          test_vector_io__setup_v(count, types_1, addrs_1, sizes_1, write_bufs_1, read_bufs_1, 'e') &&
          test_vector_io__setup_v(count, types_2, addrs_2, sizes_2, write_bufs_2, read_bufs_2, 'A')))
        TEST_ERROR;

    if (!(test_vector_io__setup_fixed_size_v(count, f_types_0, f_addrs_0, f_sizes_0, f_write_bufs_0,
                                             f_read_bufs_0, 'b') &&
          test_vector_io__setup_fixed_size_v(count, f_types_1, f_addrs_1, f_sizes_1, f_write_bufs_1,
                                             f_read_bufs_1, 'f') &&
          test_vector_io__setup_fixed_size_v(count, f_types_2, f_addrs_2, f_sizes_2, f_write_bufs_2,
                                             f_read_bufs_2, 'B')))
        TEST_ERROR;

    flags = H5F_ACC_RDWR | H5F_ACC_CREAT | H5F_ACC_TRUNC;

    if (NULL == (lf = H5FDopen(filename, flags, fapl_id, HADDR_UNDEF)))
        TEST_ERROR;

    /* allocate space for the data in the test vectors */
    for (i = 0; i < count; i++) {

        addrs_0[i] = H5FDalloc(lf, types_0[i], H5P_DEFAULT, (hsize_t)(sizes_0[i]));
        addrs_1[i] = H5FDalloc(lf, types_1[i], H5P_DEFAULT, (hsize_t)(sizes_1[i]));
        addrs_2[i] = H5FDalloc(lf, types_2[i], H5P_DEFAULT, (hsize_t)(sizes_2[i]));

        if ((addrs_0[i] == HADDR_UNDEF) || (addrs_1[i] == HADDR_UNDEF) || (addrs_2[i] == HADDR_UNDEF))
            TEST_ERROR;

        SET_SIZE(size_fixed_0, f_sizes_0, f_size_0, i);
        SET_SIZE(size_fixed_1, f_sizes_1, f_size_1, i);
        SET_SIZE(size_fixed_2, f_sizes_2, f_size_2, i);

        SET_TYPE(type_fixed_0, f_types_0, f_type_0, i);
        SET_TYPE(type_fixed_1, f_types_1, f_type_1, i);
        SET_TYPE(type_fixed_2, f_types_2, f_type_2, i);

        f_addrs_0[i] = H5FDalloc(lf, f_type_0, H5P_DEFAULT, (hsize_t)(f_size_0));
        f_addrs_1[i] = H5FDalloc(lf, f_type_1, H5P_DEFAULT, (hsize_t)(f_size_1));
        f_addrs_2[i] = H5FDalloc(lf, f_type_2, H5P_DEFAULT, (hsize_t)(f_size_2));

        if ((f_addrs_0[i] == HADDR_UNDEF) || (f_addrs_1[i] == HADDR_UNDEF) || (f_addrs_2[i] == HADDR_UNDEF))
            TEST_ERROR;
    }

    if (verbose) {

        test_vector_io__dump_test_vectors(count, types_0, addrs_0, sizes_0, write_bufs_0, NULL, "zero");

        test_vector_io__dump_test_vectors(count, types_1, addrs_1, sizes_1, write_bufs_1, NULL, "one");

        test_vector_io__dump_test_vectors(count, types_2, addrs_2, sizes_2, write_bufs_2, NULL, "two");

        test_vector_io__dump_test_vectors(count, f_types_0, f_addrs_0, f_sizes_0, f_write_bufs_0, NULL,
                                          "fixed zero");

        test_vector_io__dump_test_vectors(count, f_types_1, f_addrs_1, f_sizes_1, f_write_bufs_1, NULL,
                                          "fixed one");

        test_vector_io__dump_test_vectors(count, f_types_2, f_addrs_2, f_sizes_2, f_write_bufs_2, NULL,
                                          "fixed two");
    }

    /* write and then read using vector I/O.  First, read/write vector
     * of length 1, then of length 2, then remainder of vector
     */
    if (H5FDwrite_vector(lf, H5P_DEFAULT, 1, &(types_0[0]), &(addrs_0[0]), &(sizes_0[0]),
                         &(write_bufs_0[0])) < 0)
        TEST_ERROR;

    if (H5FDread_vector(lf, H5P_DEFAULT, 1, &(types_0[0]), &(addrs_0[0]), &(sizes_0[0]), &(read_bufs_0[0])) <
        0)
        TEST_ERROR;

    if (H5FDwrite_vector(lf, H5P_DEFAULT, 2, &(types_0[1]), &(addrs_0[1]), &(sizes_0[1]),
                         &(write_bufs_0[1])) < 0)
        TEST_ERROR;

    if (H5FDread_vector(lf, H5P_DEFAULT, 2, &(types_0[1]), &(addrs_0[1]), &(sizes_0[1]), &(read_bufs_0[1])) <
        0)
        TEST_ERROR;

    if (H5FDwrite_vector(lf, H5P_DEFAULT, count - 3, &(types_0[3]), &(addrs_0[3]), &(sizes_0[3]),
                         &(write_bufs_0[3])) < 0)
        TEST_ERROR;

    if (H5FDread_vector(lf, H5P_DEFAULT, count - 3, &(types_0[3]), &(addrs_0[3]), &(sizes_0[3]),
                        &(read_bufs_0[3])) < 0)
        TEST_ERROR;

    /* for fixed size / type vector, just write and read as single operations */
    if (H5FDwrite_vector(lf, H5P_DEFAULT, count, f_types_0, f_addrs_0, f_sizes_0, f_write_bufs_0) < 0)
        TEST_ERROR;

    if (H5FDread_vector(lf, H5P_DEFAULT, count, f_types_0, f_addrs_0, f_sizes_0, f_read_bufs_0) < 0)
        TEST_ERROR;

    /* verify that the expected data is read */
    if (!test_vector_io__verify_v(count, types_0, sizes_0, write_bufs_0, read_bufs_0, "zero"))
        TEST_ERROR;

    if (!test_vector_io__verify_v(count, f_types_0, f_sizes_0, f_write_bufs_0, f_read_bufs_0, "fixed zero"))
        TEST_ERROR;

    /* write the contents of a vector individually, and then read it back
     * in several vector reads.
     */
    if (!test_vector_io__write_v_indiv(lf, count, types_1, addrs_1, sizes_1, write_bufs_1))
        TEST_ERROR;

    if (H5FDread_vector(lf, H5P_DEFAULT, 1, &(types_1[0]), &(addrs_1[0]), &(sizes_1[0]), &(read_bufs_1[0])) <
        0)
        TEST_ERROR;

    if (H5FDread_vector(lf, H5P_DEFAULT, 2, &(types_1[1]), &(addrs_1[1]), &(sizes_1[1]), &(read_bufs_1[1])) <
        0)
        TEST_ERROR;

    if (H5FDread_vector(lf, H5P_DEFAULT, count - 3, &(types_1[3]), &(addrs_1[3]), &(sizes_1[3]),
                        &(read_bufs_1[3])) < 0)
        TEST_ERROR;

    /* for fixed size, write individually, and the read back in a single call */
    if (!test_vector_io__write_v_indiv(lf, count, f_types_1, f_addrs_1, f_sizes_1, f_write_bufs_1))
        TEST_ERROR;

    if (H5FDread_vector(lf, H5P_DEFAULT, count, f_types_1, f_addrs_1, f_sizes_1, f_read_bufs_1) < 0)
        TEST_ERROR;

    /* verify that the expected data is read */
    if (!test_vector_io__verify_v(count, types_1, sizes_1, write_bufs_1, read_bufs_1, "one"))
        TEST_ERROR;

    if (!test_vector_io__verify_v(count, f_types_1, f_sizes_1, f_write_bufs_1, f_read_bufs_1, "fixed one"))
        TEST_ERROR;

    /* Write the contents of a vector as several vector writes, then
     * read it back in individual reads.
     */
    if (H5FDwrite_vector(lf, H5P_DEFAULT, 1, &(types_2[0]), &(addrs_2[0]), &(sizes_2[0]),
                         &(write_bufs_2[0])) < 0)
        TEST_ERROR;

    if (H5FDwrite_vector(lf, H5P_DEFAULT, 2, &(types_2[1]), &(addrs_2[1]), &(sizes_2[1]),
                         &(write_bufs_2[1])) < 0)
        TEST_ERROR;

    if (H5FDwrite_vector(lf, H5P_DEFAULT, count - 3, &(types_2[3]), &(addrs_2[3]), &(sizes_2[3]),
                         &(write_bufs_2[3])) < 0)
        TEST_ERROR;

    if (!test_vector_io__read_v_indiv(lf, count, types_2, addrs_2, sizes_2, read_bufs_2))
        TEST_ERROR;

    /* for fixed size, write as a single vector, read back individually */
    if (H5FDwrite_vector(lf, H5P_DEFAULT, count, f_types_2, f_addrs_2, f_sizes_2, f_write_bufs_2) < 0)
        TEST_ERROR;

    if (!test_vector_io__read_v_indiv(lf, count, f_types_2, f_addrs_2, f_sizes_2, f_read_bufs_2))
        TEST_ERROR;

    /* verify that the expected data is read */
    if (!test_vector_io__verify_v(count, types_2, sizes_2, write_bufs_2, read_bufs_2, "two"))
        TEST_ERROR;

    if (!test_vector_io__verify_v(count, f_types_2, f_sizes_2, f_write_bufs_2, f_read_bufs_2, "fixed two"))
        TEST_ERROR;

    /* make note of eoa -- needed after we re-open the file */
    if (HADDR_UNDEF == (eoa = H5FDget_eoa(lf, H5FD_MEM_DEFAULT)))
        TEST_ERROR;

    /* close the file and then re-open it */
    if (H5FDclose(lf) < 0)
        TEST_ERROR;

    flags = H5F_ACC_RDWR;

    if (NULL == (lf = H5FDopen(filename, flags, fapl_id, HADDR_UNDEF)))
        TEST_ERROR;

    /* The EOA is set to 0 on open.  To avoid errors, we must set it
     * to its correct value before we do any reads.
     *
     * Note:  In the context of using the VFD layer without the HDF5
     *        library on top, this doesn't make much sense.  Consider
     *        adding an open flag that sets the EOA to the current file
     *        size.
     */
    if (H5FDset_eoa(lf, H5FD_MEM_DEFAULT, eoa) < 0)
        TEST_ERROR;

    /* Null the read vectors */

    size_fixed_0 = false;
    size_fixed_1 = false;
    size_fixed_2 = false;

    for (i = 0; i < count; i++) {

        buf = read_bufs_0[i];
        for (j = 0; j < sizes_0[i]; j++) {
            buf[j] = '\0';
        }

        buf = read_bufs_1[i];
        for (j = 0; j < sizes_1[i]; j++) {
            buf[j] = '\0';
        }

        buf = read_bufs_2[i];
        for (j = 0; j < sizes_2[i]; j++) {
            buf[j] = '\0';
        }

        SET_SIZE(size_fixed_0, f_sizes_0, f_size_0, i);
        SET_SIZE(size_fixed_1, f_sizes_1, f_size_1, i);
        SET_SIZE(size_fixed_2, f_sizes_2, f_size_2, i);

        buf = f_read_bufs_0[i];
        for (j = 0; j < f_size_0; j++) {
            buf[j] = '\0';
        }

        buf = f_read_bufs_1[i];
        for (j = 0; j < f_size_1; j++) {
            buf[j] = '\0';
        }

        buf = f_read_bufs_2[i];
        for (j = 0; j < f_size_2; j++) {
            buf[j] = '\0';
        }
    }

    /* read the contents of the file */
    if (H5FDread_vector(lf, H5P_DEFAULT, count, types_0, addrs_0, sizes_0, read_bufs_0) < 0)
        TEST_ERROR;

    if (H5FDread_vector(lf, H5P_DEFAULT, count, types_1, addrs_1, sizes_1, read_bufs_1) < 0)
        TEST_ERROR;

    if (H5FDread_vector(lf, H5P_DEFAULT, count, types_2, addrs_2, sizes_2, read_bufs_2) < 0)
        TEST_ERROR;

    if (H5FDread_vector(lf, H5P_DEFAULT, count, f_types_0, f_addrs_0, f_sizes_0, f_read_bufs_0) < 0)
        TEST_ERROR;

    if (H5FDread_vector(lf, H5P_DEFAULT, count, f_types_1, f_addrs_1, f_sizes_1, f_read_bufs_1) < 0)
        TEST_ERROR;

    if (H5FDread_vector(lf, H5P_DEFAULT, count, f_types_2, f_addrs_2, f_sizes_2, f_read_bufs_2) < 0)
        TEST_ERROR;

    /* verify the contents. */
    if (!test_vector_io__verify_v(count, types_0, sizes_0, write_bufs_0, read_bufs_0, "zero-"))
        TEST_ERROR;

    if (!test_vector_io__verify_v(count, types_1, sizes_1, write_bufs_1, read_bufs_1, "one-"))
        TEST_ERROR;

    if (!test_vector_io__verify_v(count, types_2, sizes_2, write_bufs_2, read_bufs_2, "two-"))
        TEST_ERROR;

    if (!test_vector_io__verify_v(count, f_types_0, f_sizes_0, f_write_bufs_0, f_read_bufs_0, "fixed zero-"))
        TEST_ERROR;

    if (!test_vector_io__verify_v(count, f_types_1, f_sizes_1, f_write_bufs_1, f_read_bufs_1, "fixed one-"))
        TEST_ERROR;

    if (!test_vector_io__verify_v(count, f_types_2, f_sizes_2, f_write_bufs_2, f_read_bufs_2, "fixed two-"))
        TEST_ERROR;

    if (H5FDclose(lf) < 0)
        TEST_ERROR;

    h5_delete_test_file(FILENAME[0], fapl_id);

    /* Close the fapl */
    if (H5Pclose(fapl_id) < 0)
        TEST_ERROR;

    /* discard the read and write buffers */

    for (i = 0; i < count; i++) {

        h5_free_const(write_bufs_0[i]);
        write_bufs_0[i] = NULL;

        h5_free_const(write_bufs_1[i]);
        write_bufs_1[i] = NULL;

        h5_free_const(write_bufs_2[i]);
        write_bufs_2[i] = NULL;

        free(read_bufs_0[i]);
        read_bufs_0[i] = NULL;

        free(read_bufs_1[i]);
        read_bufs_1[i] = NULL;

        free(read_bufs_2[i]);
        read_bufs_2[i] = NULL;

        h5_free_const(f_write_bufs_0[i]);
        f_write_bufs_0[i] = NULL;

        h5_free_const(f_write_bufs_1[i]);
        f_write_bufs_1[i] = NULL;

        h5_free_const(f_write_bufs_2[i]);
        f_write_bufs_2[i] = NULL;

        free(f_read_bufs_0[i]);
        f_read_bufs_0[i] = NULL;

        free(f_read_bufs_1[i]);
        f_read_bufs_1[i] = NULL;

        free(f_read_bufs_2[i]);
        f_read_bufs_2[i] = NULL;
    }

    PASSED();
    return 0;

error:
    H5E_BEGIN_TRY
    {
        H5Pclose(fapl_id);
        H5FDclose(lf);
    }
    H5E_END_TRY
    return -1;
} /* end test_vector_io() */

/*-------------------------------------------------------------------------
 * Function:    test_selection_io_write
 *
 * Purpose:     Updates write buffers to ensure a unique value is written
 *              to each element and issues a selection write call.
 *
 * Return:      Success:        true
 *              Failure:        false
 *-------------------------------------------------------------------------
 */
/* Array dimensions, used for all selection I/O tests.  Currently both must be
 * even.  1-Dimensional arrays have a size of SEL_IO_DIM0 * SEL_IO_DIM1. */
#define SEL_IO_DIM0 8
#define SEL_IO_DIM1 10

static herr_t
test_selection_io_write(H5FD_t *lf, H5FD_mem_t type, uint32_t count, hid_t mem_spaces[], hid_t file_spaces[],
                        haddr_t offsets[], size_t element_sizes[], int *wbufs[])
{
    const void **bufs; /* Avoids cast/const warnings */
    int          i;
    int          j;

    if (NULL == (bufs = calloc(count, sizeof(void *))))
        TEST_ERROR;

    /* Update write buffer */
    for (i = 0; i < (int)count; i++) {
        if (wbufs[i] && (i == 0 || wbufs[i] != wbufs[i - 1]))
            for (j = 0; j < SEL_IO_DIM0 * SEL_IO_DIM1; j++)
                wbufs[i][j] += 2 * SEL_IO_DIM0 * SEL_IO_DIM1;
        bufs[i] = wbufs[i];
    }

    /* Issue write call */
    if (H5FDwrite_selection(lf, type, H5P_DEFAULT, count, mem_spaces, file_spaces, offsets, element_sizes,
                            bufs) < 0)
        TEST_ERROR;

    free(bufs);

    return 0;

error:
    free(bufs);
    return -1;
} /* end test_selection_io_write() */

/*-------------------------------------------------------------------------
 * Function:    test_selection_io_read_verify
 *
 * Purpose:     Issues a selection read call and compares the result to
 *              the arrays provided in erbufs.  If rbufcount is less than
 *              count the last element in erbufs will be repeated to make
 *              up the difference.
 *
 * Return:      Success:        true
 *              Failure:        false
 *
 *-------------------------------------------------------------------------
 */
static herr_t
test_selection_io_read_verify(H5FD_t *lf, H5FD_mem_t type, uint32_t count, hid_t mem_spaces[],
                              hid_t file_spaces[], haddr_t offsets[], size_t element_sizes[],
                              uint32_t rbufcount, int *erbufs[], bool shorten_rbufs)
{
    int  rbuf1[SEL_IO_DIM0 * SEL_IO_DIM1];
    int  rbuf2[SEL_IO_DIM0 * SEL_IO_DIM1];
    int *rbufs[2] = {rbuf1, rbuf2};
    int  i;
    int  j;

    /* Initialize read buffer */
    for (i = 0; i < (int)rbufcount; i++)
        for (j = 0; j < SEL_IO_DIM0 * SEL_IO_DIM1; j++)
            rbufs[i][j] = -1;

    /* Handle elements in count that are not part of rbufcount */
    for (i = (int)rbufcount; i < (int)count; i++)
        if (shorten_rbufs)
            rbufs[i] = NULL;
        else
            rbufs[i] = rbufs[rbufcount - 1];

    /* Issue read call */
    if (H5FDread_selection(lf, type, H5P_DEFAULT, count, mem_spaces, file_spaces, offsets, element_sizes,
                           (void **)rbufs) < 0)
        TEST_ERROR;

    /* Verify result */
    for (i = 0; i < (int)rbufcount; i++)
        for (j = 0; j < SEL_IO_DIM0 * SEL_IO_DIM1; j++)
            if (rbufs[i][j] != erbufs[i][j]) {
                H5_FAILED();
                AT();
                printf("data read from file does not match expected values at mapping array location %d\n",
                       i);
                printf("expected data: \n");
                for (j = 0; j < SEL_IO_DIM0 * SEL_IO_DIM1; j++) {
                    printf("%6d", erbufs[i][j]);
                    if (!((j + 1) % SEL_IO_DIM1))
                        printf("\n");
                }
                printf("read data: \n");
                for (j = 0; j < SEL_IO_DIM0 * SEL_IO_DIM1; j++) {
                    printf("%6d", rbufs[i][j]);
                    if (!((j + 1) % SEL_IO_DIM1))
                        printf("\n");
                }
                goto error;
            }

    return 0;

error:
    return -1;
} /* end test_selection_io_read_verify() */

/*-------------------------------------------------------------------------
 * Function:    test_selection_io
 *
 * Purpose:     Test I/O using the selection I/O VFD public VFD calls.
 *
 *              Tests various combinations of 1D, 2D, contiguous, and
 *              strided selections with different file data types and
 *              with and without shortened arrays.
 *
 * Return:      Success:        0
 *              Failure:        -1
 *
 *-------------------------------------------------------------------------
 */
static herr_t
test_selection_io(const char *vfd_name)
{
    char       test_title[80];
    hid_t      fapl_id = H5I_INVALID_HID;                           /* file access property list ID */
    char       filename[1024];                                      /* filename                     */
    unsigned   flags = 0;                                           /* file open flags              */
    H5FD_t    *lf    = NULL;                                        /* VFD struct ptr               */
    int        i;                                                   /* index                        */
    int        j;                                                   /* index                        */
    int        i2;                                                  /* index                        */
    int        j2;                                                  /* index                        */
    hid_t      mem_spaces[2]  = {H5I_INVALID_HID, H5I_INVALID_HID}; /* memory dataspaces vector */
    hid_t      file_spaces[2] = {H5I_INVALID_HID, H5I_INVALID_HID}; /* file dataspaces vector */
    hsize_t    dims1[1]       = {SEL_IO_DIM0 * SEL_IO_DIM1};        /* 1D dataspace dimensions */
    hsize_t    dims2[2]       = {SEL_IO_DIM0, SEL_IO_DIM1};         /* 1D dataspace dimensions */
    hsize_t    start[2];                                            /* start for hyperslab          */
    hsize_t    stride[2];                                           /* stride for hyperslab         */
    hsize_t    count[2];                                            /* count for hyperslab          */
    hsize_t    block[2];                                            /* block for hyperslab          */
    H5FD_mem_t type;                                                /* file data type               */
    haddr_t    addrs[2];                                            /* addresses vector             */
    size_t     element_sizes[2] = {sizeof(int), sizeof(int)};       /* element sizes vector */
    int        wbuf1[SEL_IO_DIM0 * SEL_IO_DIM1];                    /* 1D write buffer        */
    int        wbuf2[SEL_IO_DIM0][SEL_IO_DIM1];                     /* 2D write buffer         */
    int       *wbufs[2] = {wbuf1, wbuf2[0]};                        /* Array of write buffers    */
    int        fbuf1[SEL_IO_DIM0 * SEL_IO_DIM1];                    /* 1D file buffer         */
    int        fbuf2[SEL_IO_DIM0][SEL_IO_DIM1];                     /* 2D file buffer          */
    int       *fbufs[2] = {fbuf1, fbuf2[0]};                        /* Array of file buffers     */
    int        erbuf1[SEL_IO_DIM0 * SEL_IO_DIM1];                   /* 1D expected read buffer */
    int        erbuf2[SEL_IO_DIM0][SEL_IO_DIM1];                    /* 2D expected read buffer */
    int       *erbufs[2] = {erbuf1, erbuf2[0]};                     /* Array of expected read buffers */
    int        shorten_element_sizes; /* Whether to shorten the element sizes array */

    snprintf(test_title, sizeof(test_title), "selection I/O with %s VFD", vfd_name);

    TESTING(test_title);

    /* Set property list and file name for target driver */

    if ((fapl_id = H5Pcreate(H5P_FILE_ACCESS)) < 0)
        TEST_ERROR;

    if (strcmp(vfd_name, "sec2") == 0) {

        if (H5Pset_fapl_sec2(fapl_id) < 0)
            TEST_ERROR;

        h5_fixname(FILENAME[0], fapl_id, filename, sizeof(filename));
    }
    else if (strcmp(vfd_name, "stdio") == 0) {

        if (H5Pset_fapl_stdio(fapl_id) < 0)
            TEST_ERROR;

        h5_fixname(FILENAME[7], fapl_id, filename, sizeof filename);
    }
    else {

        fprintf(stdout, "un-supported VFD\n");
        TEST_ERROR;
    }

    /* Initialize write buffers */
    for (i = 0; i < SEL_IO_DIM0; i++)
        for (j = 0; j < SEL_IO_DIM1; j++) {
            wbuf1[(i * SEL_IO_DIM1) + j] = (i * SEL_IO_DIM1) + j;
            wbuf2[i][j]                  = (i * SEL_IO_DIM1) + j + (SEL_IO_DIM0 * SEL_IO_DIM1);
        }

    /* Create dataspaces - location 0 will be 1D and location 1 will be 2D */
    if ((mem_spaces[0] = H5Screate_simple(1, dims1, NULL)) < 0)
        TEST_ERROR;
    if ((mem_spaces[1] = H5Screate_simple(2, dims2, NULL)) < 0)
        TEST_ERROR;
    if ((file_spaces[0] = H5Screate_simple(1, dims1, NULL)) < 0)
        TEST_ERROR;
    if ((file_spaces[1] = H5Screate_simple(2, dims2, NULL)) < 0)
        TEST_ERROR;

    /* Create file */
    flags = H5F_ACC_RDWR | H5F_ACC_CREAT | H5F_ACC_TRUNC;

    if (NULL == (lf = H5FDopen(filename, flags, fapl_id, HADDR_UNDEF)))
        TEST_ERROR;

    /* Loop over memory types */
    for (type = 1; type < H5FD_MEM_NTYPES; type++) {
        /* Allocate space for I/O */
        addrs[0] = H5FDalloc(lf, type, H5P_DEFAULT, (hsize_t)(sizeof(int) * SEL_IO_DIM0 * SEL_IO_DIM1));
        addrs[1] = H5FDalloc(lf, type, H5P_DEFAULT, (hsize_t)(sizeof(int) * SEL_IO_DIM0 * SEL_IO_DIM1));

        /*
         * Test 1: Simple 1D contiguous I/O
         */
        /* Issue write call */
        if (test_selection_io_write(lf, type, 1, &mem_spaces[0], &file_spaces[0], &addrs[0], element_sizes,
                                    (int **)&wbufs[0]) < 0)
            TEST_ERROR;

        /* Update file buf */
        for (i = 0; i < SEL_IO_DIM0 * SEL_IO_DIM1; i++)
            fbuf1[i] = wbuf1[i];

        /* Read and verify */
        if (test_selection_io_read_verify(lf, type, 1, &mem_spaces[0], &file_spaces[0], &addrs[0],
                                          element_sizes, 1, (int **)&fbufs[0], false) < 0)
            TEST_ERROR;

        /*
         * Test 2: Simple 2D contiguous I/O
         */
        /* Issue write call */
        if (test_selection_io_write(lf, type, 1, &mem_spaces[1], &file_spaces[1], &addrs[1], element_sizes,
                                    (int **)&wbufs[1]) < 0)
            TEST_ERROR;

        /* Update file buf */
        for (i = 0; i < SEL_IO_DIM0; i++)
            for (j = 0; j < SEL_IO_DIM1; j++)
                fbuf2[i][j] = wbuf2[i][j];

        /* Read and verify */
        if (test_selection_io_read_verify(lf, type, 1, &mem_spaces[1], &file_spaces[1], &addrs[1],
                                          element_sizes, 1, (int **)&fbufs[1], false) < 0)
            TEST_ERROR;

        /*
         * Test 3: Strided <> Contiguous 1D I/O
         */
        /* SEL_IO_DIM1 must be even */
        assert(SEL_IO_DIM1 / 2 == (SEL_IO_DIM1 + 1) / 2);

        /* Strided selection in memory */
        start[0]  = 1;
        stride[0] = 2;
        count[0]  = (SEL_IO_DIM0 * SEL_IO_DIM1) / 2;
        block[0]  = 1;
        if (H5Sselect_hyperslab(mem_spaces[0], H5S_SELECT_SET, start, stride, count, block) < 0)
            TEST_ERROR;

        /* Contiguous selection in file */
        if (H5Sselect_hyperslab(file_spaces[0], H5S_SELECT_SET, start, NULL, count, NULL) < 0)
            TEST_ERROR;

        /* Issue write call */
        if (test_selection_io_write(lf, type, 1, &mem_spaces[0], &file_spaces[0], &addrs[0], element_sizes,
                                    (int **)&wbufs[0]) < 0)
            TEST_ERROR;

        /* Update file buf */
        for (i = 0; i < (SEL_IO_DIM0 * SEL_IO_DIM1) / 2; i++)
            fbuf1[i + 1] = wbuf1[(2 * i) + 1];

        /* Update expected read buf */
        for (i = 0; i < (SEL_IO_DIM0 * SEL_IO_DIM1); i++)
            erbuf1[i] = -1;
        for (i = 0; i < (SEL_IO_DIM0 * SEL_IO_DIM1) / 2; i++)
            erbuf1[(2 * i) + 1] = wbuf1[(2 * i) + 1];

        /* Read and verify */
        if (test_selection_io_read_verify(lf, type, 1, &mem_spaces[0], &file_spaces[0], &addrs[0],
                                          element_sizes, 1, (int **)&erbufs[0], false) < 0)
            TEST_ERROR;

        /* Reset selections */
        if (H5Sselect_all(mem_spaces[0]) < 0)
            TEST_ERROR;
        if (H5Sselect_all(file_spaces[0]) < 0)
            TEST_ERROR;

        /* Read entire file buffer and verify */
        if (test_selection_io_read_verify(lf, type, 1, &mem_spaces[0], &file_spaces[0], &addrs[0],
                                          element_sizes, 1, (int **)&fbufs[0], false) < 0)
            TEST_ERROR;

        /*
         * Test 4: Contiguous <> Strided 1D I/O
         */
        /* SEL_IO_DIM1 must be even */
        assert(SEL_IO_DIM1 / 2 == (SEL_IO_DIM1 + 1) / 2);

        /* Contiguous selection in memory */
        start[0]  = 1;
        stride[0] = 2;
        if (H5Sselect_hyperslab(mem_spaces[0], H5S_SELECT_SET, start, NULL, count, NULL) < 0)
            TEST_ERROR;

        /* Strided selection in file */
        count[0] = (SEL_IO_DIM0 * SEL_IO_DIM1) / 2;
        block[0] = 1;
        if (H5Sselect_hyperslab(file_spaces[0], H5S_SELECT_SET, start, stride, count, block) < 0)
            TEST_ERROR;

        /* Issue write call */
        if (test_selection_io_write(lf, type, 1, &mem_spaces[0], &file_spaces[0], &addrs[0], element_sizes,
                                    (int **)&wbufs[0]) < 0)
            TEST_ERROR;

        /* Update file buf */
        for (i = 0; i < (SEL_IO_DIM0 * SEL_IO_DIM1) / 2; i++)
            fbuf1[(2 * i) + 1] = wbuf1[i + 1];

        /* Update expected read buf */
        for (i = 0; i < (SEL_IO_DIM0 * SEL_IO_DIM1); i++)
            erbuf1[i] = -1;
        for (i = 0; i < (SEL_IO_DIM0 * SEL_IO_DIM1) / 2; i++)
            erbuf1[i + 1] = wbuf1[i + 1];

        /* Read and verify */
        if (test_selection_io_read_verify(lf, type, 1, &mem_spaces[0], &file_spaces[0], &addrs[0],
                                          element_sizes, 1, (int **)&erbufs[0], false) < 0)
            TEST_ERROR;

        /* Reset selections */
        if (H5Sselect_all(mem_spaces[0]) < 0)
            TEST_ERROR;
        if (H5Sselect_all(file_spaces[0]) < 0)
            TEST_ERROR;

        /* Read entire file buffer and verify */
        if (test_selection_io_read_verify(lf, type, 1, &mem_spaces[0], &file_spaces[0], &addrs[0],
                                          element_sizes, 1, (int **)&fbufs[0], false) < 0)
            TEST_ERROR;

        /*
         * Test 5: Strided <> Strided 1D I/O
         */
        /* SEL_IO_DIM1 must be even */
        assert(SEL_IO_DIM1 / 2 == (SEL_IO_DIM1 + 1) / 2);

        /* Strided selection in memory */
        start[0]  = 1;
        stride[0] = 2;
        count[0]  = (SEL_IO_DIM0 * SEL_IO_DIM1) / 2;
        block[0]  = 1;
        if (H5Sselect_hyperslab(mem_spaces[0], H5S_SELECT_SET, start, stride, count, block) < 0)
            TEST_ERROR;

        /* Strided selection in file */
        start[0] = 0;
        if (H5Sselect_hyperslab(file_spaces[0], H5S_SELECT_SET, start, stride, count, block) < 0)
            TEST_ERROR;

        /* Issue write call */
        if (test_selection_io_write(lf, type, 1, &mem_spaces[0], &file_spaces[0], &addrs[0], element_sizes,
                                    (int **)&wbufs[0]) < 0)
            TEST_ERROR;

        /* Update file buf */
        for (i = 0; i < (SEL_IO_DIM0 * SEL_IO_DIM1) / 2; i++)
            fbuf1[2 * i] = wbuf1[(2 * i) + 1];

        /* Update expected read buf */
        for (i = 0; i < (SEL_IO_DIM0 * SEL_IO_DIM1); i++)
            erbuf1[i] = -1;
        for (i = 0; i < (SEL_IO_DIM0 * SEL_IO_DIM1) / 2; i++)
            erbuf1[(2 * i) + 1] = wbuf1[(2 * i) + 1];

        /* Read and verify */
        if (test_selection_io_read_verify(lf, type, 1, &mem_spaces[0], &file_spaces[0], &addrs[0],
                                          element_sizes, 1, (int **)&erbufs[0], false) < 0)
            TEST_ERROR;

        /* Reset selections */
        if (H5Sselect_all(mem_spaces[0]) < 0)
            TEST_ERROR;
        if (H5Sselect_all(file_spaces[0]) < 0)
            TEST_ERROR;

        /* Read entire file buffer and verify */
        if (test_selection_io_read_verify(lf, type, 1, &mem_spaces[0], &file_spaces[0], &addrs[0],
                                          element_sizes, 1, (int **)&fbufs[0], false) < 0)
            TEST_ERROR;

        /*
         * Test 6: Strided <> Contiguous 2D I/O
         */
        /* Strided selection in memory */
        start[0]  = 1;
        start[1]  = 0;
        stride[0] = 2;
        stride[1] = 1;
        count[0]  = SEL_IO_DIM0 / 2;
        count[1]  = SEL_IO_DIM1;
        block[0]  = 1;
        block[1]  = 1;
        if (H5Sselect_hyperslab(mem_spaces[1], H5S_SELECT_SET, start, stride, count, block) < 0)
            TEST_ERROR;

        /* Contiguous selection in file */
        if (H5Sselect_hyperslab(file_spaces[1], H5S_SELECT_SET, start, NULL, count, NULL) < 0)
            TEST_ERROR;

        /* Issue write call */
        if (test_selection_io_write(lf, type, 1, &mem_spaces[1], &file_spaces[1], &addrs[1], element_sizes,
                                    (int **)&wbufs[1]) < 0)
            TEST_ERROR;

        /* Update file buf */
        for (i = 0; i < SEL_IO_DIM0 / 2; i++)
            for (j = 0; j < SEL_IO_DIM1; j++)
                fbuf2[i + 1][j] = wbuf2[(2 * i) + 1][j];

        /* Update expected read buf */
        for (i = 0; i < SEL_IO_DIM0; i++)
            for (j = 0; j < SEL_IO_DIM1; j++)
                erbuf2[i][j] = -1;
        for (i = 0; i < SEL_IO_DIM0 / 2; i++)
            for (j = 0; j < SEL_IO_DIM1; j++)
                erbuf2[(2 * i) + 1][j] = wbuf2[(2 * i) + 1][j];

        /* Read and verify */
        if (test_selection_io_read_verify(lf, type, 1, &mem_spaces[1], &file_spaces[1], &addrs[1],
                                          element_sizes, 1, (int **)&erbufs[1], false) < 0)
            TEST_ERROR;

        /* Reset selections */
        if (H5Sselect_all(mem_spaces[1]) < 0)
            TEST_ERROR;
        if (H5Sselect_all(file_spaces[1]) < 0)
            TEST_ERROR;

        /* Read entire file buffer and verify */
        if (test_selection_io_read_verify(lf, type, 1, &mem_spaces[1], &file_spaces[1], &addrs[1],
                                          element_sizes, 1, (int **)&fbufs[1], false) < 0)
            TEST_ERROR;

        /*
         * Test 7: Contiguous <> Strided 2D I/O
         */
        /* Contiguous selection in memory */
        start[0] = 0;
        start[1] = 1;
        count[0] = SEL_IO_DIM0;
        count[1] = SEL_IO_DIM1 / 2;
        if (H5Sselect_hyperslab(mem_spaces[1], H5S_SELECT_SET, start, NULL, count, NULL) < 0)
            TEST_ERROR;

        /* Strided selection in file */
        stride[0] = 1;
        stride[1] = 2;
        block[0]  = 1;
        block[1]  = 1;
        if (H5Sselect_hyperslab(file_spaces[1], H5S_SELECT_SET, start, stride, count, block) < 0)
            TEST_ERROR;

        /* Issue write call */
        if (test_selection_io_write(lf, type, 1, &mem_spaces[1], &file_spaces[1], &addrs[1], element_sizes,
                                    (int **)&wbufs[1]) < 0)
            TEST_ERROR;

        /* Update file buf */
        for (i = 0; i < SEL_IO_DIM0; i++)
            for (j = 0; j < SEL_IO_DIM1 / 2; j++)
                fbuf2[i][(2 * j) + 1] = wbuf2[i][j + 1];

        /* Update expected read buf */
        for (i = 0; i < SEL_IO_DIM0; i++)
            for (j = 0; j < SEL_IO_DIM1; j++)
                erbuf2[i][j] = -1;
        for (i = 0; i < SEL_IO_DIM0; i++)
            for (j = 0; j < SEL_IO_DIM1 / 2; j++)
                erbuf2[i][j + 1] = wbuf2[i][j + 1];

        /* Read and verify */
        if (test_selection_io_read_verify(lf, type, 1, &mem_spaces[1], &file_spaces[1], &addrs[1],
                                          element_sizes, 1, (int **)&erbufs[1], false) < 0)
            TEST_ERROR;

        /* Reset selections */
        if (H5Sselect_all(mem_spaces[1]) < 0)
            TEST_ERROR;
        if (H5Sselect_all(file_spaces[1]) < 0)
            TEST_ERROR;

        /* Read entire file buffer and verify */
        if (test_selection_io_read_verify(lf, type, 1, &mem_spaces[1], &file_spaces[1], &addrs[1],
                                          element_sizes, 1, (int **)&fbufs[1], false) < 0)
            TEST_ERROR;

        /*
         * Test 8: Strided <> Strided 2D I/O
         */
        /* SEL_IO_DIM0 and SEL_IO_DIM1 must be even */
        assert(SEL_IO_DIM0 / 2 == (SEL_IO_DIM0 + 1) / 2);
        assert(SEL_IO_DIM1 / 2 == (SEL_IO_DIM1 + 1) / 2);

        /* Strided selection (across dim 1) in memory */
        start[0]  = 0;
        start[1]  = 1;
        stride[0] = 1;
        stride[1] = 2;
        count[0]  = SEL_IO_DIM0;
        count[1]  = SEL_IO_DIM1 / 2;
        block[0]  = 1;
        block[1]  = 1;
        if (H5Sselect_hyperslab(mem_spaces[1], H5S_SELECT_SET, start, stride, count, block) < 0)
            TEST_ERROR;

        /* Strided selection (across dim 0) in file */
        start[0]  = 1;
        start[1]  = 0;
        stride[0] = 2;
        stride[1] = 1;
        count[0]  = SEL_IO_DIM0 / 2;
        count[1]  = SEL_IO_DIM1;
        block[0]  = 1;
        block[1]  = 1;
        if (H5Sselect_hyperslab(file_spaces[1], H5S_SELECT_SET, start, stride, count, block) < 0)
            TEST_ERROR;

        /* Issue write call */
        if (test_selection_io_write(lf, type, 1, &mem_spaces[1], &file_spaces[1], &addrs[1], element_sizes,
                                    (int **)&wbufs[1]) < 0)
            TEST_ERROR;

        /* Update file buf */
        for (i = 0, i2 = 1, j2 = 0; i < SEL_IO_DIM0; i++)
            for (j = 1; j < SEL_IO_DIM1; j += 2) {
                assert(i2 < SEL_IO_DIM0);
                fbuf2[i2][j2] = wbuf2[i][j];
                if (++j2 == SEL_IO_DIM1) {
                    i2 += 2;
                    j2 = 0;
                }
            }

        /* Update expected read buf */
        for (i = 0; i < SEL_IO_DIM0; i++)
            for (j = 0; j < SEL_IO_DIM1; j++)
                erbuf2[i][j] = -1;
        for (i = 0; i < SEL_IO_DIM0; i++)
            for (j = 1; j < SEL_IO_DIM1; j += 2)
                erbuf2[i][j] = wbuf2[i][j];

        /* Read and verify */
        if (test_selection_io_read_verify(lf, type, 1, &mem_spaces[1], &file_spaces[1], &addrs[1],
                                          element_sizes, 1, (int **)&erbufs[1], false) < 0)
            TEST_ERROR;

        /* Reset selections */
        if (H5Sselect_all(mem_spaces[1]) < 0)
            TEST_ERROR;
        if (H5Sselect_all(file_spaces[1]) < 0)
            TEST_ERROR;

        /* Read entire file buffer and verify */
        if (test_selection_io_read_verify(lf, type, 1, &mem_spaces[1], &file_spaces[1], &addrs[1],
                                          element_sizes, 1, (int **)&fbufs[1], false) < 0)
            TEST_ERROR;

        /*
         * Test 9: Strided 1D <> Strided 2D I/O
         */
        /* Strided selection in memory */
        start[0]  = 1;
        stride[0] = 2;
        count[0]  = (SEL_IO_DIM0 * SEL_IO_DIM1) / 2;
        block[0]  = 1;
        if (H5Sselect_hyperslab(mem_spaces[0], H5S_SELECT_SET, start, stride, count, block) < 0)
            TEST_ERROR;

        /* Strided selection (across dim 1) in file */
        start[0]  = 0;
        start[1]  = 1;
        stride[0] = 1;
        stride[1] = 2;
        count[0]  = SEL_IO_DIM0;
        count[1]  = SEL_IO_DIM1 / 2;
        block[0]  = 1;
        block[1]  = 1;
        if (H5Sselect_hyperslab(file_spaces[1], H5S_SELECT_SET, start, stride, count, block) < 0)
            TEST_ERROR;

        /* Issue write call */
        if (test_selection_io_write(lf, type, 1, &mem_spaces[0], &file_spaces[1], &addrs[1], element_sizes,
                                    (int **)&wbufs[0]) < 0)
            TEST_ERROR;

        /* Update file buf */
        for (i = 1, i2 = 0, j2 = 1; i < (SEL_IO_DIM0 * SEL_IO_DIM1); i += 2) {
            assert(i2 < SEL_IO_DIM0);
            fbuf2[i2][j2] = wbuf1[i];
            j2 += 2;
            if (j2 >= SEL_IO_DIM1) {
                i2++;
                j2 = 1;
            }
        }

        /* Update expected read buf */
        for (i = 0; i < (SEL_IO_DIM0 * SEL_IO_DIM1); i++)
            erbuf1[i] = -1;
        for (i = 1; i < (SEL_IO_DIM0 * SEL_IO_DIM1); i += 2)
            erbuf1[i] = wbuf1[i];

        /* Read and verify */
        if (test_selection_io_read_verify(lf, type, 1, &mem_spaces[0], &file_spaces[1], &addrs[1],
                                          element_sizes, 1, (int **)&erbufs[0], false) < 0)
            TEST_ERROR;

        /* Reset selections */
        if (H5Sselect_all(mem_spaces[0]) < 0)
            TEST_ERROR;
        if (H5Sselect_all(file_spaces[1]) < 0)
            TEST_ERROR;

        /* Read entire file buffer and verify */
        if (test_selection_io_read_verify(lf, type, 1, &mem_spaces[0], &file_spaces[1], &addrs[1],
                                          element_sizes, 1, (int **)&fbufs[1], false) < 0)
            TEST_ERROR;

        /*
         * Test 10: Strided 2D <> Strided 1D I/O
         */
        /* Strided selection (across dim 0) in memory */
        start[0]  = 0;
        start[1]  = 0;
        stride[0] = 2;
        stride[1] = 1;
        count[0]  = SEL_IO_DIM0 / 2;
        count[1]  = SEL_IO_DIM1;
        block[0]  = 1;
        block[1]  = 1;
        if (H5Sselect_hyperslab(mem_spaces[1], H5S_SELECT_SET, start, stride, count, block) < 0)
            TEST_ERROR;

        /* Strided selection in file */
        start[0]  = 0;
        stride[0] = 2;
        count[0]  = (SEL_IO_DIM0 * SEL_IO_DIM1) / 2;
        block[0]  = 1;
        if (H5Sselect_hyperslab(file_spaces[0], H5S_SELECT_SET, start, stride, count, block) < 0)
            TEST_ERROR;

        /* Issue write call */
        if (test_selection_io_write(lf, type, 1, &mem_spaces[1], &file_spaces[0], &addrs[0], element_sizes,
                                    (int **)&wbufs[1]) < 0)
            TEST_ERROR;

        /* Update file buf */
        for (i = 0, i2 = 0; i < SEL_IO_DIM0; i += 2)
            for (j = 0; j < SEL_IO_DIM1; j++) {
                assert(i2 < (SEL_IO_DIM0 * SEL_IO_DIM1));
                fbuf1[i2] = wbuf2[i][j];
                i2 += 2;
            }

        /* Update expected read buf */
        for (i = 0; i < SEL_IO_DIM0; i++)
            for (j = 0; j < SEL_IO_DIM1; j++)
                erbuf2[i][j] = -1;
        for (i = 0; i < SEL_IO_DIM0; i += 2)
            for (j = 0; j < SEL_IO_DIM1; j++)
                erbuf2[i][j] = wbuf2[i][j];

        /* Read and verify */
        if (test_selection_io_read_verify(lf, type, 1, &mem_spaces[1], &file_spaces[0], &addrs[0],
                                          element_sizes, 1, (int **)&erbufs[1], false) < 0)
            TEST_ERROR;

        /* Reset selections */
        if (H5Sselect_all(mem_spaces[1]) < 0)
            TEST_ERROR;
        if (H5Sselect_all(file_spaces[0]) < 0)
            TEST_ERROR;

        /* Read entire file buffer and verify */
        if (test_selection_io_read_verify(lf, type, 1, &mem_spaces[1], &file_spaces[0], &addrs[0],
                                          element_sizes, 1, (int **)&fbufs[0], false) < 0)
            TEST_ERROR;

        /* Run tests with full and partial element sizes array */
        for (shorten_element_sizes = 0; shorten_element_sizes <= 1; shorten_element_sizes++) {
            /*
             * Test 11: Strided <> Strided 1D and 2D I/O
             */
            /* SEL_IO_DIM1 must be even */
            assert(SEL_IO_DIM1 / 2 == (SEL_IO_DIM1 + 1) / 2);

            /* Strided selection in memory (1D) */
            start[0]  = 0;
            stride[0] = 2;
            count[0]  = (SEL_IO_DIM0 * SEL_IO_DIM1) / 2;
            block[0]  = 1;
            if (H5Sselect_hyperslab(mem_spaces[0], H5S_SELECT_SET, start, stride, count, block) < 0)
                TEST_ERROR;

            /* Strided selection in file (1D) */
            start[0] = 1;
            if (H5Sselect_hyperslab(file_spaces[0], H5S_SELECT_SET, start, stride, count, block) < 0)
                TEST_ERROR;

            /* Strided selection (across dim 0) in memory (2D) */
            start[0]  = 1;
            start[1]  = 0;
            stride[0] = 2;
            stride[1] = 1;
            count[0]  = SEL_IO_DIM0 / 2;
            count[1]  = SEL_IO_DIM1;
            block[0]  = 1;
            block[1]  = 1;
            if (H5Sselect_hyperslab(mem_spaces[1], H5S_SELECT_SET, start, stride, count, block) < 0)
                TEST_ERROR;

            /* Strided selection (across dim 1) in file (2D) */
            start[0]  = 0;
            start[1]  = 1;
            stride[0] = 1;
            stride[1] = 2;
            count[0]  = SEL_IO_DIM0;
            count[1]  = SEL_IO_DIM1 / 2;
            block[0]  = 1;
            block[1]  = 1;
            if (H5Sselect_hyperslab(file_spaces[1], H5S_SELECT_SET, start, stride, count, block) < 0)
                TEST_ERROR;

            /* Issue write call */
            if (test_selection_io_write(lf, type, 2, mem_spaces, file_spaces, addrs, element_sizes,
                                        (int **)wbufs) < 0)
                TEST_ERROR;

            /* Update file bufs */
            for (i = 0; i < (SEL_IO_DIM0 * SEL_IO_DIM1) / 2; i++)
                fbuf1[(2 * i) + 1] = wbuf1[2 * i];
            for (i = 1, i2 = 0, j2 = 1; i < SEL_IO_DIM0; i += 2)
                for (j = 0; j < SEL_IO_DIM1; j++) {
                    assert(i2 < SEL_IO_DIM0);
                    fbuf2[i2][j2] = wbuf2[i][j];
                    j2 += 2;
                    if (j2 >= SEL_IO_DIM1) {
                        i2++;
                        j2 = 1;
                    }
                }

            /* Update expected read bufs */
            for (i = 0; i < (SEL_IO_DIM0 * SEL_IO_DIM1); i++)
                erbuf1[i] = -1;
            for (i = 0; i < (SEL_IO_DIM0 * SEL_IO_DIM1) / 2; i++)
                erbuf1[2 * i] = wbuf1[2 * i];
            for (i = 0; i < SEL_IO_DIM0; i++)
                for (j = 0; j < SEL_IO_DIM1; j++)
                    erbuf2[i][j] = -1;
            for (i = 1; i < SEL_IO_DIM0; i += 2)
                for (j = 0; j < SEL_IO_DIM1; j++)
                    erbuf2[i][j] = wbuf2[i][j];

            /* Read and verify */
            if (test_selection_io_read_verify(lf, type, 2, mem_spaces, file_spaces, addrs, element_sizes, 2,
                                              (int **)erbufs, false) < 0)
                TEST_ERROR;

            /* Reset selections */
            if (H5Sselect_all(mem_spaces[0]) < 0)
                TEST_ERROR;
            if (H5Sselect_all(file_spaces[0]) < 0)
                TEST_ERROR;
            if (H5Sselect_all(mem_spaces[1]) < 0)
                TEST_ERROR;
            if (H5Sselect_all(file_spaces[1]) < 0)
                TEST_ERROR;

            /* Read entire file buffer and verify */
            if (test_selection_io_read_verify(lf, type, 2, mem_spaces, file_spaces, addrs, element_sizes, 2,
                                              (int **)fbufs, false) < 0)
                TEST_ERROR;

            /*
             * Test 12: Strided <> Strided 2D I/O, 2 different selections in the same memory buffer
             */
            /* Switch mem and file spaces to both be 2D */
            if (H5Sset_extent_simple(mem_spaces[0], 2, dims2, NULL) < 0)
                TEST_ERROR;
            if (H5Sset_extent_simple(file_spaces[0], 2, dims2, NULL) < 0)
                TEST_ERROR;

            /* Strided selection in memory (1st) */
            start[0]  = 0;
            start[1]  = 0;
            stride[0] = 2;
            stride[1] = 1;
            count[0]  = SEL_IO_DIM0 / 2;
            count[1]  = SEL_IO_DIM1;
            block[0]  = 1;
            block[1]  = 1;
            if (H5Sselect_hyperslab(mem_spaces[0], H5S_SELECT_SET, start, stride, count, block) < 0)
                TEST_ERROR;

            /* Strided selection (across dim 0) in memory (2nd) */
            start[0] = 1;
            if (H5Sselect_hyperslab(mem_spaces[1], H5S_SELECT_SET, start, stride, count, block) < 0)
                TEST_ERROR;

            /* Strided selection in file (1st) */
            start[0]  = 0;
            start[1]  = 0;
            stride[0] = 1;
            stride[1] = 2;
            count[0]  = SEL_IO_DIM0;
            count[1]  = SEL_IO_DIM1 / 2;
            block[0]  = 1;
            block[1]  = 1;
            if (H5Sselect_hyperslab(file_spaces[0], H5S_SELECT_SET, start, stride, count, block) < 0)
                TEST_ERROR;

            /* Strided selection (across dim 1) in file (2nd) */
            start[0]  = 0;
            start[1]  = 1;
            stride[0] = 1;
            stride[1] = 2;
            count[0]  = SEL_IO_DIM0;
            count[1]  = SEL_IO_DIM1 / 2;
            block[0]  = 1;
            block[1]  = 1;
            if (H5Sselect_hyperslab(file_spaces[1], H5S_SELECT_SET, start, stride, count, block) < 0)
                TEST_ERROR;

            /* Use the same memory buffer for both selections */
            wbufs[0] = wbuf2[0];

            /* Shorten wbuf array */
            if (shorten_element_sizes)
                wbufs[1] = NULL;
            else
                wbufs[1] = wbufs[0];

            /* Issue write call */
            if (test_selection_io_write(lf, type, 2, mem_spaces, file_spaces, addrs, element_sizes,
                                        (int **)wbufs) < 0)
                TEST_ERROR;

            /* Update file bufs - need to reuse 1D array so data stays consistent, so use math to
             * find 1D index into 2D array */
            for (i = 0, i2 = 0, j2 = 0; i < SEL_IO_DIM0; i += 2)
                for (j = 0; j < SEL_IO_DIM1; j++) {
                    assert(i2 < SEL_IO_DIM0);
                    fbuf1[(i2 * SEL_IO_DIM1) + j2] = wbuf2[i][j];
                    j2 += 2;
                    if (j2 >= SEL_IO_DIM1) {
                        i2++;
                        j2 = 0;
                    }
                }
            for (i = 1, i2 = 0, j2 = 1; i < SEL_IO_DIM0; i += 2)
                for (j = 0; j < SEL_IO_DIM1; j++) {
                    assert(i2 < SEL_IO_DIM0);
                    fbuf2[i2][j2] = wbuf2[i][j];
                    j2 += 2;
                    if (j2 >= SEL_IO_DIM1) {
                        i2++;
                        j2 = 1;
                    }
                }

            /* Update expected read buf */
            for (i = 0; i < SEL_IO_DIM0; i++)
                for (j = 0; j < SEL_IO_DIM1; j++)
                    erbuf2[i][j] = -1;
            for (i = 0; i < SEL_IO_DIM0; i += 2)
                for (j = 0; j < SEL_IO_DIM1; j++)
                    erbuf2[i][j] = wbuf2[i][j];
            for (i = 1; i < SEL_IO_DIM0; i += 2)
                for (j = 0; j < SEL_IO_DIM1; j++)
                    erbuf2[i][j] = wbuf2[i][j];

            /* Read and verify */
            if (test_selection_io_read_verify(lf, type, 2, mem_spaces, file_spaces, addrs, element_sizes, 1,
                                              (int **)&erbufs[1], shorten_element_sizes ? true : false) < 0)
                TEST_ERROR;

            /* Reset selections */
            if (H5Sselect_all(mem_spaces[0]) < 0)
                TEST_ERROR;
            if (H5Sselect_all(file_spaces[0]) < 0)
                TEST_ERROR;
            if (H5Sselect_all(mem_spaces[1]) < 0)
                TEST_ERROR;
            if (H5Sselect_all(file_spaces[1]) < 0)
                TEST_ERROR;

            /* Read entire file buffer and verify */
            if (test_selection_io_read_verify(lf, type, 2, mem_spaces, file_spaces, addrs, element_sizes, 2,
                                              (int **)fbufs, false) < 0)
                TEST_ERROR;

            /* Reset first spaces to 1D */
            if (H5Sset_extent_simple(mem_spaces[0], 1, dims1, NULL) < 0)
                TEST_ERROR;
            if (H5Sset_extent_simple(file_spaces[0], 1, dims1, NULL) < 0)
                TEST_ERROR;

            /* Reset write buffer array */
            wbufs[0] = wbuf1;
            wbufs[1] = wbuf2[0];

            /* Change to shortened element sizes array */
            element_sizes[1] = 0;
        }

        /* Reset element sizes array */
        element_sizes[1] = element_sizes[0];
    }

    /*
     * Cleanup
     */
    /* Close file */
    if (H5FDclose(lf) < 0)
        TEST_ERROR;

    h5_delete_test_file(FILENAME[0], fapl_id);

    /* Close the fapl */
    if (H5Pclose(fapl_id) < 0)
        TEST_ERROR;

    /* Close dataspaces */
    for (i = 0; i < 2; i++) {
        if (H5Sclose(mem_spaces[i]) < 0)
            TEST_ERROR;
        if (H5Sclose(file_spaces[i]) < 0)
            TEST_ERROR;
    }

    PASSED();
    return 0;

error:
    H5E_BEGIN_TRY
    {
        H5Pclose(fapl_id);
        H5FDclose(lf);
        for (i = 0; i < 2; i++) {
            H5Sclose(mem_spaces[i]);
            H5Sclose(file_spaces[i]);
        }
    }
    H5E_END_TRY
    return -1;
} /* end test_selection_io() */

/*-------------------------------------------------------------------------
 * Function:    main
 *
 * Purpose:     Tests the basic features of Virtual File Drivers
 *
 * Return:      EXIT_SUCCESS/EXIT_FAILURE
 *
 *-------------------------------------------------------------------------
 */
int
main(void)
{
    char *env_h5_drvr = NULL;
    int   nerrors     = 0;

    /* Don't run VFD tests when HDF5_DRIVER is set. These tests expect a
     * specific VFD to be set and HDF5_DRIVER being set can interfere
     * with that.
     */
    env_h5_drvr = getenv(HDF5_DRIVER);
    if (env_h5_drvr) {
        printf(" -- SKIPPED VFD tests because %s is set -- \n", HDF5_DRIVER);
        exit(EXIT_SUCCESS);
    }

    h5_reset();

    printf("Testing basic Virtual File Driver functionality.\n");

    setup_rand();

    nerrors += test_sec2() < 0 ? 1 : 0;
    nerrors += test_core() < 0 ? 1 : 0;
    nerrors += test_direct() < 0 ? 1 : 0;
    nerrors += test_family() < 0 ? 1 : 0;
    nerrors += test_family_compat() < 0 ? 1 : 0;
    nerrors += test_family_member_fapl() < 0 ? 1 : 0;
    nerrors += test_multi() < 0 ? 1 : 0;
    nerrors += test_multi_compat() < 0 ? 1 : 0;
    nerrors += test_log() < 0 ? 1 : 0;
    nerrors += test_stdio() < 0 ? 1 : 0;
    nerrors += test_windows() < 0 ? 1 : 0;
    nerrors += test_ros3() < 0 ? 1 : 0;
    nerrors += test_splitter() < 0 ? 1 : 0;
    nerrors += test_vector_io("sec2") < 0 ? 1 : 0;
    nerrors += test_vector_io("stdio") < 0 ? 1 : 0;
    nerrors += test_selection_io("sec2") < 0 ? 1 : 0;
    nerrors += test_selection_io("stdio") < 0 ? 1 : 0;
    nerrors += test_ctl() < 0 ? 1 : 0;

    if (nerrors) {
        printf("***** %d Virtual File Driver TEST%s FAILED! *****\n", nerrors, nerrors > 1 ? "S" : "");
        return EXIT_FAILURE;
    }

    printf("All Virtual File Driver tests passed.\n");

    return EXIT_SUCCESS;
} /* end main() */