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Incorporate strerror_r() into src/port/snprintf.c, too.

Browse Source 
This provides the features that used to exist in useful_strerror()
for users of strerror_r(), too.  Also, standardize on the GNU convention
that strerror_r returns a char pointer that may not be NULL.

I notice that libpq's win32.c contains a variant version of strerror_r
that probably ought to be folded into strerror.c.  But lacking a
Windows environment, I should leave that to somebody else.

Discussion: https://postgr.es/m/2975.1526862605@sss.pgh.pa.us
This commit is contained in:
Tom Lane 2018-09-26 12:35:57 -04:00
parent 26e9d4d4ef
commit 758ce9b779
11 changed files with 99 additions and 83 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
src/include/port.h
View File

@ -193,6 +193,11 @@ extern int pg_printf(const char *fmt,...) pg_attribute_printf(1, 2);
extern char *pg_strerror(int errnum);
#define strerror pg_strerror
/* Likewise for strerror_r(); note we prefer the GNU API for that */
extern char *pg_strerror_r(int errnum, char *buf, size_t buflen);
#define strerror_r pg_strerror_r
#define PG_STRERROR_R_BUFLEN 256 /* Recommended buffer size for strerror_r */
/* Portable prompt handling */
extern void simple_prompt(const char *prompt, char *destination, size_t destlen,
bool echo);
@ -428,8 +433,6 @@ extern char *dlerror(void);
#endif
/* thread.h */
extern char *pqStrerror(int errnum, char *strerrbuf, size_t buflen);
#ifndef WIN32
extern int pqGetpwuid(uid_t uid, struct passwd *resultbuf, char *buffer,
size_t buflen, struct passwd **result);

6
src/interfaces/libpq/fe-auth.c
View File

@ -756,11 +756,11 @@ pg_local_sendauth(PGconn *conn)
if (sendmsg(conn->sock, &msg, 0) == -1)
{
char sebuf[256];
char sebuf[PG_STRERROR_R_BUFLEN];
printfPQExpBuffer(&conn->errorMessage,
"pg_local_sendauth: sendmsg: %s\n",
pqStrerror(errno, sebuf, sizeof(sebuf)));
strerror_r(errno, sebuf, sizeof(sebuf)));
return STATUS_ERROR;
}
return STATUS_OK;
@ -1098,7 +1098,7 @@ pg_fe_getauthname(PQExpBuffer errorMessage)
printfPQExpBuffer(errorMessage,
libpq_gettext("could not look up local user ID %d: %s\n"),
(int) user_id,
pqStrerror(pwerr, pwdbuf, sizeof(pwdbuf)));
strerror_r(pwerr, pwdbuf, sizeof(pwdbuf)));
else
printfPQExpBuffer(errorMessage,
libpq_gettext("local user with ID %d does not exist\n"),

18
src/interfaces/libpq/fe-connect.c
View File

@ -1459,7 +1459,7 @@ connectNoDelay(PGconn *conn)
(char *) &on,
sizeof(on)) < 0)
{
char sebuf[256];
char sebuf[PG_STRERROR_R_BUFLEN];
appendPQExpBuffer(&conn->errorMessage,
libpq_gettext("could not set socket to TCP no delay mode: %s\n"),
@ -1480,7 +1480,7 @@ connectNoDelay(PGconn *conn)
static void
connectFailureMessage(PGconn *conn, int errorno)
{
char sebuf[256];
char sebuf[PG_STRERROR_R_BUFLEN];
#ifdef HAVE_UNIX_SOCKETS
if (IS_AF_UNIX(conn->raddr.addr.ss_family))
@ -1637,7 +1637,7 @@ setKeepalivesIdle(PGconn *conn)
if (setsockopt(conn->sock, IPPROTO_TCP, PG_TCP_KEEPALIVE_IDLE,
(char *) &idle, sizeof(idle)) < 0)
{
char sebuf[256];
char sebuf[PG_STRERROR_R_BUFLEN];
appendPQExpBuffer(&conn->errorMessage,
libpq_gettext("setsockopt(%s) failed: %s\n"),
@ -1671,7 +1671,7 @@ setKeepalivesInterval(PGconn *conn)
if (setsockopt(conn->sock, IPPROTO_TCP, TCP_KEEPINTVL,
(char *) &interval, sizeof(interval)) < 0)
{
char sebuf[256];
char sebuf[PG_STRERROR_R_BUFLEN];
appendPQExpBuffer(&conn->errorMessage,
libpq_gettext("setsockopt(%s) failed: %s\n"),
@ -1706,7 +1706,7 @@ setKeepalivesCount(PGconn *conn)
if (setsockopt(conn->sock, IPPROTO_TCP, TCP_KEEPCNT,
(char *) &count, sizeof(count)) < 0)
{
char sebuf[256];
char sebuf[PG_STRERROR_R_BUFLEN];
appendPQExpBuffer(&conn->errorMessage,
libpq_gettext("setsockopt(%s) failed: %s\n"),
@ -2036,7 +2036,7 @@ PQconnectPoll(PGconn *conn)
bool reset_connection_state_machine = false;
bool need_new_connection = false;
PGresult *res;
char sebuf[256];
char sebuf[PG_STRERROR_R_BUFLEN];
int optval;
PQExpBufferData savedMessage;
@ -2580,7 +2580,7 @@ keep_going: /* We will come back to here until there is
else
appendPQExpBuffer(&conn->errorMessage,
libpq_gettext("could not get peer credentials: %s\n"),
pqStrerror(errno, sebuf, sizeof(sebuf)));
strerror_r(errno, sebuf, sizeof(sebuf)));
goto error_return;
}
@ -2591,7 +2591,7 @@ keep_going: /* We will come back to here until there is
appendPQExpBuffer(&conn->errorMessage,
libpq_gettext("could not look up local user ID %d: %s\n"),
(int) uid,
pqStrerror(passerr, sebuf, sizeof(sebuf)));
strerror_r(passerr, sebuf, sizeof(sebuf)));
else
appendPQExpBuffer(&conn->errorMessage,
libpq_gettext("local user with ID %d does not exist\n"),
@ -3953,7 +3953,7 @@ internal_cancel(SockAddr *raddr, int be_pid, int be_key,
{
int save_errno = SOCK_ERRNO;
pgsocket tmpsock = PGINVALID_SOCKET;
char sebuf[256];
char sebuf[PG_STRERROR_R_BUFLEN];
int maxlen;
struct
{

14
src/interfaces/libpq/fe-lobj.c
View File

@ -694,7 +694,7 @@ lo_import_internal(PGconn *conn, const char *filename, Oid oid)
char buf[LO_BUFSIZE];
Oid lobjOid;
int lobj;
char sebuf[256];
char sebuf[PG_STRERROR_R_BUFLEN];
/*
* open the file to be read in
@ -704,7 +704,7 @@ lo_import_internal(PGconn *conn, const char *filename, Oid oid)
{ /* error */
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("could not open file \"%s\": %s\n"),
filename, pqStrerror(errno, sebuf, sizeof(sebuf)));
filename, strerror_r(errno, sebuf, sizeof(sebuf)));
return InvalidOid;
}
@ -760,7 +760,7 @@ lo_import_internal(PGconn *conn, const char *filename, Oid oid)
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("could not read from file \"%s\": %s\n"),
filename,
pqStrerror(save_errno, sebuf, sizeof(sebuf)));
strerror_r(save_errno, sebuf, sizeof(sebuf)));
return InvalidOid;
}
@ -789,7 +789,7 @@ lo_export(PGconn *conn, Oid lobjId, const char *filename)
tmp;
char buf[LO_BUFSIZE];
int lobj;
char sebuf[256];
char sebuf[PG_STRERROR_R_BUFLEN];
/*
* open the large object.
@ -814,7 +814,7 @@ lo_export(PGconn *conn, Oid lobjId, const char *filename)
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("could not open file \"%s\": %s\n"),
filename,
pqStrerror(save_errno, sebuf, sizeof(sebuf)));
strerror_r(save_errno, sebuf, sizeof(sebuf)));
return -1;
}
@ -834,7 +834,7 @@ lo_export(PGconn *conn, Oid lobjId, const char *filename)
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("could not write to file \"%s\": %s\n"),
filename,
pqStrerror(save_errno, sebuf, sizeof(sebuf)));
strerror_r(save_errno, sebuf, sizeof(sebuf)));
return -1;
}
}
@ -857,7 +857,7 @@ lo_export(PGconn *conn, Oid lobjId, const char *filename)
{
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("could not write to file \"%s\": %s\n"),
filename, pqStrerror(errno, sebuf, sizeof(sebuf)));
filename, strerror_r(errno, sebuf, sizeof(sebuf)));
result = -1;
}

2
src/interfaces/libpq/fe-misc.c
View File

@ -1071,7 +1071,7 @@ pqSocketCheck(PGconn *conn, int forRead, int forWrite, time_t end_time)
if (result < 0)
{
char sebuf[256];
char sebuf[PG_STRERROR_R_BUFLEN];
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("select() failed: %s\n"),

12
src/interfaces/libpq/fe-secure-openssl.c
View File

@ -142,7 +142,7 @@ pgtls_read(PGconn *conn, void *ptr, size_t len)
{
ssize_t n;
int result_errno = 0;
char sebuf[256];
char sebuf[PG_STRERROR_R_BUFLEN];
int err;
unsigned long ecode;
@ -272,7 +272,7 @@ pgtls_write(PGconn *conn, const void *ptr, size_t len)
{
ssize_t n;
int result_errno = 0;
char sebuf[256];
char sebuf[PG_STRERROR_R_BUFLEN];
int err;
unsigned long ecode;
@ -443,7 +443,7 @@ pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len)
return cert_hash;
}
#endif /* HAVE_X509_GET_SIGNATURE_NID */
#endif /* HAVE_X509_GET_SIGNATURE_NID */
/* ------------------------------------------------------------ */
/* OpenSSL specific code */
@ -780,7 +780,7 @@ initialize_SSL(PGconn *conn)
struct stat buf;
char homedir[MAXPGPATH];
char fnbuf[MAXPGPATH];
char sebuf[256];
char sebuf[PG_STRERROR_R_BUFLEN];
bool have_homedir;
bool have_cert;
bool have_rootcert;
@ -941,7 +941,7 @@ initialize_SSL(PGconn *conn)
{
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("could not open certificate file \"%s\": %s\n"),
fnbuf, pqStrerror(errno, sebuf, sizeof(sebuf)));
fnbuf, strerror_r(errno, sebuf, sizeof(sebuf)));
SSL_CTX_free(SSL_context);
return -1;
}
@ -1212,7 +1212,7 @@ open_client_SSL(PGconn *conn)
case SSL_ERROR_SYSCALL:
{
char sebuf[256];
char sebuf[PG_STRERROR_R_BUFLEN];
if (r == -1)
printfPQExpBuffer(&conn->errorMessage,

4
src/interfaces/libpq/fe-secure.c
View File

@ -233,7 +233,7 @@ pqsecure_raw_read(PGconn *conn, void *ptr, size_t len)
{
ssize_t n;
int result_errno = 0;
char sebuf[256];
char sebuf[PG_STRERROR_R_BUFLEN];
n = recv(conn->sock, ptr, len, 0);
@ -311,7 +311,7 @@ pqsecure_raw_write(PGconn *conn, const void *ptr, size_t len)
ssize_t n;
int flags = 0;
int result_errno = 0;
char sebuf[256];
char sebuf[PG_STRERROR_R_BUFLEN];
DECLARE_SIGPIPE_INFO(spinfo);

2
src/interfaces/libpq/libpq-int.h
View File

@ -773,7 +773,7 @@ extern char *libpq_ngettext(const char *msgid, const char *msgid_plural, unsigne
#define SOCK_ERRNO_SET(e) WSASetLastError(e)
#else
#define SOCK_ERRNO errno
#define SOCK_STRERROR pqStrerror
#define SOCK_STRERROR strerror_r
#define SOCK_ERRNO_SET(e) (errno = (e))
#endif

85
src/port/strerror.c
View File

@ -1,7 +1,7 @@
/*-------------------------------------------------------------------------
*
* strerror.c
* Replacement for standard strerror() function
* Replacements for standard strerror() and strerror_r() functions
*
* Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
@ -15,13 +15,16 @@
#include "c.h"
/*
* Within this file, "strerror" means the platform's function not pg_strerror
* Within this file, "strerror" means the platform's function not pg_strerror,
* and likewise for "strerror_r"
*/
#undef strerror
#undef strerror_r
static char *gnuish_strerror_r(int errnum, char *buf, size_t buflen);
static char *get_errno_symbol(int errnum);
#ifdef WIN32
static char *win32_socket_strerror(int errnum);
static char *win32_socket_strerror(int errnum, char *buf, size_t buflen);
#endif
@ -31,19 +34,28 @@ static char *win32_socket_strerror(int errnum);
char *
pg_strerror(int errnum)
{
/* this buffer is only used if strerror() and get_errno_symbol() fail */
static char errorstr_buf[48];
static char errorstr_buf[PG_STRERROR_R_BUFLEN];
return pg_strerror_r(errnum, errorstr_buf, sizeof(errorstr_buf));
}
/*
* A slightly cleaned-up version of strerror_r()
*/
char *
pg_strerror_r(int errnum, char *buf, size_t buflen)
{
char *str;
/* If it's a Windows Winsock error, that needs special handling */
#ifdef WIN32
/* Winsock error code range, per WinError.h */
if (errnum >= 10000 && errnum <= 11999)
return win32_socket_strerror(errnum);
return win32_socket_strerror(errnum, buf, buflen);
#endif
/* Try the platform's strerror() */
str = strerror(errnum);
/* Try the platform's strerror_r(), or maybe just strerror() */
str = gnuish_strerror_r(errnum, buf, buflen);
/*
* Some strerror()s return an empty string for out-of-range errno. This
@ -57,17 +69,42 @@ pg_strerror(int errnum)
if (str == NULL)
{
snprintf(errorstr_buf, sizeof(errorstr_buf),
/*------
translator: This string will be truncated at 47
characters expanded. */
_("operating system error %d"), errnum);
str = errorstr_buf;
snprintf(buf, buflen, _("operating system error %d"), errnum);
str = buf;
}
return str;
}
/*
* Simple wrapper to emulate GNU strerror_r if what the platform provides is
* POSIX. Also, if platform lacks strerror_r altogether, fall back to plain
* strerror; it might not be very thread-safe, but tough luck.
*/
static char *
gnuish_strerror_r(int errnum, char *buf, size_t buflen)
{
#ifdef HAVE_STRERROR_R
#ifdef STRERROR_R_INT
/* POSIX API */
if (strerror_r(errnum, buf, buflen) == 0)
return buf;
return NULL; /* let caller deal with failure */
#else
/* GNU API */
return strerror_r(errnum, buf, buflen);
#endif
#else /* !HAVE_STRERROR_R */
char *sbuf = strerror(errnum);
if (sbuf == NULL) /* can this still happen anywhere? */
return NULL;
/* To minimize thread-unsafety hazard, copy into caller's buffer */
strlcpy(buf, sbuf, buflen);
return buf;
#endif
}
/*
* Returns a symbol (e.g. "ENOENT") for an errno code.
* Returns NULL if the code is unrecognized.
@ -247,9 +284,8 @@ get_errno_symbol(int errnum)
* Windows' strerror() doesn't know the Winsock codes, so handle them this way
*/
static char *
win32_socket_strerror(int errnum)
win32_socket_strerror(int errnum, char *buf, size_t buflen)
{
static char wserrbuf[256];
static HANDLE handleDLL = INVALID_HANDLE_VALUE;
if (handleDLL == INVALID_HANDLE_VALUE)
@ -258,28 +294,29 @@ win32_socket_strerror(int errnum)
DONT_RESOLVE_DLL_REFERENCES | LOAD_LIBRARY_AS_DATAFILE);
if (handleDLL == NULL)
{
sprintf(wserrbuf, "winsock error %d (could not load netmsg.dll to translate: error code %lu)",
errnum, GetLastError());
return wserrbuf;
snprintf(buf, buflen,
"winsock error %d (could not load netmsg.dll to translate: error code %lu)",
errnum, GetLastError());
return buf;
}
}
ZeroMemory(&wserrbuf, sizeof(wserrbuf));
ZeroMemory(buf, buflen);
if (FormatMessage(FORMAT_MESSAGE_IGNORE_INSERTS |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_FROM_HMODULE,
handleDLL,
errnum,
MAKELANGID(LANG_ENGLISH, SUBLANG_DEFAULT),
wserrbuf,
sizeof(wserrbuf) - 1,
buf,
buflen - 1,
NULL) == 0)
{
/* Failed to get id */
sprintf(wserrbuf, "unrecognized winsock error %d", errnum);
snprintf(buf, buflen, "unrecognized winsock error %d", errnum);
}
return wserrbuf;
return buf;
}
#endif /* WIN32 */

27
src/port/thread.c
View File

@ -53,33 +53,6 @@
*/
/*
* Wrapper around strerror and strerror_r to use the former if it is
* available and also return a more useful value (the error string).
*/
char *
pqStrerror(int errnum, char *strerrbuf, size_t buflen)
{
#if defined(FRONTEND) && defined(ENABLE_THREAD_SAFETY) && defined(HAVE_STRERROR_R)
/* reentrant strerror_r is available */
#ifdef STRERROR_R_INT
/* SUSv3 version */
if (strerror_r(errnum, strerrbuf, buflen) == 0)
return strerrbuf;
else
return "Unknown error";
#else
/* GNU libc */
return strerror_r(errnum, strerrbuf, buflen);
#endif
#else
/* no strerror_r() available, just use strerror */
strlcpy(strerrbuf, strerror(errnum), buflen);
return strerrbuf;
#endif
}
/*
* Wrapper around getpwuid() or getpwuid_r() to mimic POSIX getpwuid_r()
* behaviour, if that function is not available or required.

5
src/test/thread/thread_test.c
View File

@ -22,6 +22,9 @@
#if !defined(IN_CONFIGURE) && !defined(WIN32)
#include "postgres.h"
/* we want to know what the native strerror does, not pg_strerror */
#undef strerror
#endif
#include <stdio.h>
@ -197,7 +200,7 @@ main(int argc, char *argv[])
/* report results */
#ifdef HAVE_STRERROR_R
printf("Your system has sterror_r(); it does not need strerror().\n");
printf("Your system has strerror_r(); it does not need strerror().\n");
#else
printf("Your system uses strerror() which is ");
if (strerror_threadsafe)