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21abc39185
libtool/libltdl/ltdl.c
Gary V. Vaughan 21abc39185 * libltdl/ltdl.c (argz_append, argz_create_sep, argz_insert) 
(argz_next, argz_stringify): Move from here...
* libltdl/argz.c: New file. ...to here.
* libltdl/lt__glibc.h: New file. Rename global symbols into the
lt__ namespace.
* libltdl/lt__private.h: Include lt__glibc.h.
* libltdl/Makefile.am (libltdl_la_SOURCES): Add new files.
(AM_CPPFLAGS): Add -DLTDL.
* libltdl/argz.h (argz_append, argz_create_sep, argz_insert)
(argz_next, argz_stringify): New file. Declare argz functions
here, including lt__glibc.h when LTDL is defined to rename global
symbols for libltdl.
* m4/ltdl.m4 (AC_LTDL_FUNC_ARGZ): Add argz to AC_LIBOBJ if any of
our argz_* functions are missing from the system libraries.
2004-04-08 14:13:07 +00:00

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/* ltdl.c -- system independent dlopen wrapper
Copyright (C) 1998, 1999, 2000, 2004 Free Software Foundation, Inc.
Originally by Thomas Tanner <tanner@ffii.org>
NOTE: The canonical source of this file is maintained with the
GNU Libtool package. Report bugs to bug-libtool@gnu.org.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
As a special exception to the GNU Lesser General Public License,
if you distribute this file as part of a program or library that
is built using GNU libtool, you may include it under the same
distribution terms that you use for the rest of that program.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA
*/
#include "lt__private.h"
/* --- MANIFEST CONSTANTS --- */
/* Standard libltdl search path environment variable name */
#undef LTDL_SEARCHPATH_VAR
#define LTDL_SEARCHPATH_VAR "LTDL_LIBRARY_PATH"
/* Standard libtool archive file extension. */
#undef LTDL_ARCHIVE_EXT
#define LTDL_ARCHIVE_EXT ".la"
/* max. filename length */
#ifndef LT_FILENAME_MAX
# define LT_FILENAME_MAX 1024
#endif
/* This is the maximum symbol size that won't require malloc/free */
#undef LT_SYMBOL_LENGTH
#define LT_SYMBOL_LENGTH 128
/* This accounts for the _LTX_ separator */
#undef LT_SYMBOL_OVERHEAD
#define LT_SYMBOL_OVERHEAD 5
/* --- TYPE DEFINITIONS -- */
/* This type is used for the array of caller data sets in each handler. */
typedef struct {
lt_dlcaller_id key;
void * data;
} lt_caller_data;
/* --- OPAQUE STRUCTURES DECLARED IN LTDL.H --- */
/* Extract the diagnostic strings from the error table macro in the same
order as the enumerated indices in ltdl.h. */
static const char *lt_dlerror_strings[] =
{
#define LT_ERROR(name, diagnostic) (diagnostic),
lt_dlerror_table
#undef LT_ERROR
0
};
/* This structure is used for the list of registered loaders. */
struct lt_dlloader {
struct lt_dlloader *next;
const char *loader_name; /* identifying name for each loader */
const char *sym_prefix; /* prefix for symbols */
lt_module_open *module_open;
lt_module_close *module_close;
lt_find_sym *find_sym;
lt_dlloader_exit *dlloader_exit;
lt_user_data dlloader_data;
};
struct lt_dlhandle_struct {
struct lt_dlhandle_struct *next;
lt_dlloader *loader; /* dlopening interface */
lt_dlinfo info;
int depcount; /* number of dependencies */
lt_dlhandle *deplibs; /* dependencies */
lt_module module; /* system module handle */
void * system; /* system specific data */
lt_caller_data *caller_data; /* per caller associated data */
int flags; /* various boolean stats */
};
/* Various boolean flags can be stored in the flags field of an
lt_dlhandle_struct... */
#define LT_DLGET_FLAG(handle, flag) (((handle)->flags & (flag)) == (flag))
#define LT_DLSET_FLAG(handle, flag) ((handle)->flags |= (flag))
#define LT_DLRESIDENT_FLAG (0x01 << 0)
/* ...add more flags here... */
#define LT_DLIS_RESIDENT(handle) LT_DLGET_FLAG(handle, LT_DLRESIDENT_FLAG)
#define LT_DLSTRERROR(name) lt_dlerror_strings[LT_CONC(LT_ERROR_,name)]
static const char objdir[] = LTDL_OBJDIR;
static const char archive_ext[] = LTDL_ARCHIVE_EXT;
#ifdef LTDL_SHLIB_EXT
static const char shlib_ext[] = LTDL_SHLIB_EXT;
#endif
#ifdef LTDL_SYSSEARCHPATH
static const char sys_search_path[] = LTDL_SYSSEARCHPATH;
#endif
/* --- MUTEX LOCKING --- */
/* Macros to make it easier to run the lock functions only if they have
been registered. The reason for the complicated lock macro is to
ensure that the stored error message from the last error is not
accidentally erased if the current function doesn't generate an
error of its own. */
#define LT_DLMUTEX_LOCK() LT_STMT_START { \
if (lt_dlmutex_lock_func) (*lt_dlmutex_lock_func)(); \
} LT_STMT_END
#define LT_DLMUTEX_UNLOCK() LT_STMT_START { \
if (lt_dlmutex_unlock_func) (*lt_dlmutex_unlock_func)();\
} LT_STMT_END
#define LT_DLMUTEX_SETERROR(errormsg) LT_STMT_START { \
if (lt_dlmutex_seterror_func) \
(*lt_dlmutex_seterror_func) (errormsg); \
else lt_dllast_error = (errormsg); } LT_STMT_END
#define LT_DLMUTEX_GETERROR(errormsg) LT_STMT_START { \
if (lt_dlmutex_seterror_func) \
(errormsg) = (*lt_dlmutex_geterror_func) (); \
else (errormsg) = lt_dllast_error; } LT_STMT_END
/* The mutex functions stored here are global, and are necessarily the
same for all threads that wish to share access to libltdl. */
static lt_dlmutex_lock *lt_dlmutex_lock_func = 0;
static lt_dlmutex_unlock *lt_dlmutex_unlock_func = 0;
static lt_dlmutex_seterror *lt_dlmutex_seterror_func = 0;
static lt_dlmutex_geterror *lt_dlmutex_geterror_func = 0;
static const char *lt_dllast_error = 0;
/* Either set or reset the mutex functions. Either all the arguments must
be valid functions, or else all can be NULL to turn off locking entirely.
The registered functions should be manipulating a static global lock
from the lock() and unlock() callbacks, which needs to be reentrant. */
int
lt_dlmutex_register (lt_dlmutex_lock *lock, lt_dlmutex_unlock *unlock,
lt_dlmutex_seterror *seterror, lt_dlmutex_geterror *geterror)
{
lt_dlmutex_unlock *old_unlock = unlock;
int errors = 0;
/* Lock using the old lock() callback, if any. */
LT_DLMUTEX_LOCK ();
if ((lock && unlock && seterror && geterror)
|| !(lock || unlock || seterror || geterror))
{
lt_dlmutex_lock_func = lock;
lt_dlmutex_unlock_func = unlock;
lt_dlmutex_geterror_func = geterror;
}
else
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_MUTEX_ARGS));
++errors;
}
/* Use the old unlock() callback we saved earlier, if any. Otherwise
record any errors using internal storage. */
if (old_unlock)
(*old_unlock) ();
/* Return the number of errors encountered during the execution of
this function. */
return errors;
}
/* --- ERROR HANDLING --- */
static const char **user_error_strings = 0;
static int errorcount = LT_ERROR_MAX;
int
lt_dladderror (const char *diagnostic)
{
int errindex = 0;
int result = -1;
const char **temp = (const char **) 0;
assert (diagnostic);
LT_DLMUTEX_LOCK ();
errindex = errorcount - LT_ERROR_MAX;
temp = REALLOC (const char *, user_error_strings, 1 + errindex);
if (temp)
{
user_error_strings = temp;
user_error_strings[errindex] = diagnostic;
result = errorcount++;
}
LT_DLMUTEX_UNLOCK ();
return result;
}
int
lt_dlseterror (int errindex)
{
int errors = 0;
LT_DLMUTEX_LOCK ();
if (errindex >= errorcount || errindex < 0)
{
/* Ack! Error setting the error message! */
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_ERRORCODE));
++errors;
}
else if (errindex < LT_ERROR_MAX)
{
/* No error setting the error message! */
LT_DLMUTEX_SETERROR (lt_dlerror_strings[errindex]);
}
else
{
/* No error setting the error message! */
LT_DLMUTEX_SETERROR (user_error_strings[errindex - LT_ERROR_MAX]);
}
LT_DLMUTEX_UNLOCK ();
return errors;
}
/* --- DLOPEN() INTERFACE LOADER --- */
#if HAVE_LIBDL
/* dynamic linking with dlopen/dlsym */
#if HAVE_DLFCN_H
# include <dlfcn.h>
#endif
#if HAVE_SYS_DL_H
# include <sys/dl.h>
#endif
/* We may have to define LT_LAZY_OR_NOW in the command line if we
find out it does not work in some platform. */
#ifndef LT_LAZY_OR_NOW
# ifdef RTLD_LAZY
# define LT_LAZY_OR_NOW RTLD_LAZY
# else
# ifdef DL_LAZY
# define LT_LAZY_OR_NOW DL_LAZY
# endif
# endif /* !RTLD_LAZY */
#endif
#ifndef LT_LAZY_OR_NOW
# ifdef RTLD_NOW
# define LT_LAZY_OR_NOW RTLD_NOW
# else
# ifdef DL_NOW
# define LT_LAZY_OR_NOW DL_NOW
# endif
# endif /* !RTLD_NOW */
#endif
#ifndef LT_LAZY_OR_NOW
# define LT_LAZY_OR_NOW 0
#endif /* !LT_LAZY_OR_NOW */
#if HAVE_DLERROR
# define DLERROR(arg) dlerror ()
#else
# define DLERROR(arg) LT_DLSTRERROR (arg)
#endif
static lt_module
sys_dl_open (lt_user_data loader_data, const char *filename)
{
lt_module module = dlopen (filename, LT_LAZY_OR_NOW);
if (!module)
{
LT_DLMUTEX_SETERROR (DLERROR (CANNOT_OPEN));
}
return module;
}
static int
sys_dl_close (lt_user_data loader_data, lt_module module)
{
int errors = 0;
if (dlclose (module) != 0)
{
LT_DLMUTEX_SETERROR (DLERROR (CANNOT_CLOSE));
++errors;
}
return errors;
}
static void *
sys_dl_sym (lt_user_data loader_data, lt_module module, const char *symbol)
{
void *address = dlsym (module, symbol);
if (!address)
{
LT_DLMUTEX_SETERROR (DLERROR (SYMBOL_NOT_FOUND));
}
return address;
}
static struct lt_user_dlloader sys_dl =
{
# ifdef NEED_USCORE
"_",
# else
0,
# endif
sys_dl_open, sys_dl_close, sys_dl_sym, 0, 0 };
#endif /* HAVE_LIBDL */
/* --- SHL_LOAD() INTERFACE LOADER --- */
#if HAVE_SHL_LOAD
/* dynamic linking with shl_load (HP-UX) (comments from gmodule) */
#ifdef HAVE_DL_H
# include <dl.h>
#endif
/* some flags are missing on some systems, so we provide
* harmless defaults.
*
* Mandatory:
* BIND_IMMEDIATE - Resolve symbol references when the library is loaded.
* BIND_DEFERRED - Delay code symbol resolution until actual reference.
*
* Optionally:
* BIND_FIRST - Place the library at the head of the symbol search
* order.
* BIND_NONFATAL - The default BIND_IMMEDIATE behavior is to treat all
* unsatisfied symbols as fatal. This flag allows
* binding of unsatisfied code symbols to be deferred
* until use.
* [Perl: For certain libraries, like DCE, deferred
* binding often causes run time problems. Adding
* BIND_NONFATAL to BIND_IMMEDIATE still allows
* unresolved references in situations like this.]
* BIND_NOSTART - Do not call the initializer for the shared library
* when the library is loaded, nor on a future call to
* shl_unload().
* BIND_VERBOSE - Print verbose messages concerning possible
* unsatisfied symbols.
*
* hp9000s700/hp9000s800:
* BIND_RESTRICTED - Restrict symbols visible by the library to those
* present at library load time.
* DYNAMIC_PATH - Allow the loader to dynamically search for the
* library specified by the path argument.
*/
#ifndef DYNAMIC_PATH
# define DYNAMIC_PATH 0
#endif
#ifndef BIND_RESTRICTED
# define BIND_RESTRICTED 0
#endif
#define LT_BIND_FLAGS (BIND_IMMEDIATE | BIND_NONFATAL | DYNAMIC_PATH)
static lt_module
sys_shl_open (lt_user_data loader_data, const char *filenam)
{
static shl_t self = (shl_t) 0;
lt_module module = shl_load (filename, LT_BIND_FLAGS, 0L);
/* Since searching for a symbol against a NULL module handle will also
look in everything else that was already loaded and exported with
the -E compiler flag, we always cache a handle saved before any
modules are loaded. */
if (!self)
{
void *address;
shl_findsym (&self, "main", TYPE_UNDEFINED, &address);
}
if (!filename)
{
module = self;
}
else
{
module = shl_load (filename, LT_BIND_FLAGS, 0L);
if (!module)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_OPEN));
}
}
return module;
}
static int
sys_shl_close (lt_user_data loader_data, lt_module module)
{
int errors = 0;
if (module && (shl_unload ((shl_t) (module)) != 0))
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_CLOSE));
++errors;
}
return errors;
}
static void *
sys_shl_sym (lt_user_data loader_data, lt_module module, const char *symbol)
{
void *address = 0;
/* sys_shl_open should never return a NULL module handle */
if (module == (lt_module) 0)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_HANDLE));
}
else if (!shl_findsym((shl_t*) &module, symbol, TYPE_UNDEFINED, &address))
{
if (!address)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SYMBOL_NOT_FOUND));
}
}
return address;
}
static struct lt_user_dlloader sys_shl = {
0, sys_shl_open, sys_shl_close, sys_shl_sym, 0, 0
};
#endif /* HAVE_SHL_LOAD */
/* --- LOADLIBRARY() INTERFACE LOADER --- */
#if defined(__WINDOWS__) || defined(__CYGWIN__)
/* dynamic linking for Win32 */
#include <windows.h>
/* Forward declaration; required to implement handle search below. */
static lt_dlhandle handles;
static lt_module
sys_wll_open (lt_user_data loader_data, const char *filename)
{
lt_dlhandle cur;
lt_module module = 0;
const char *errormsg = 0;
char *searchname = 0;
char *ext;
char self_name_buf[MAX_PATH];
if (!filename)
{
/* Get the name of main module */
*self_name_buf = 0;
GetModuleFileName (NULL, self_name_buf, sizeof (self_name_buf));
filename = ext = self_name_buf;
}
else
{
ext = strrchr (filename, '.');
}
if (ext)
{
/* FILENAME already has an extension. */
searchname = lt__strdup (filename);
}
else
{
/* Append a `.' to stop Windows from adding an
implicit `.dll' extension. */
searchname = MALLOC (char, 2+ LT_STRLEN (filename));
if (searchname)
sprintf (searchname, "%s.", filename);
}
if (!searchname)
return 0;
#if __CYGWIN__
{
char wpath[MAX_PATH];
cygwin_conv_to_full_win32_path(searchname, wpath);
module = LoadLibrary(wpath);
}
#else
module = LoadLibrary (searchname);
#endif
FREE (searchname);
/* libltdl expects this function to fail if it is unable
to physically load the library. Sadly, LoadLibrary
will search the loaded libraries for a match and return
one of them if the path search load fails.
We check whether LoadLibrary is returning a handle to
an already loaded module, and simulate failure if we
find one. */
LT_DLMUTEX_LOCK ();
cur = handles;
while (cur)
{
if (!cur->module)
{
cur = 0;
break;
}
if (cur->module == module)
{
break;
}
cur = cur->next;
}
LT_DLMUTEX_UNLOCK ();
if (cur || !module)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_OPEN));
module = 0;
}
return module;
}
static int
sys_wll_close (lt_user_data loader_data, lt_module module)
{
int errors = 0;
if (FreeLibrary(module) == 0)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_CLOSE));
++errors;
}
return errors;
}
static void *
sys_wll_sym (lt_user_data loader_data, lt_module module,const char *symbol)
{
void * address = GetProcAddress (module, symbol);
if (!address)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SYMBOL_NOT_FOUND));
}
return address;
}
static struct lt_user_dlloader sys_wll = {
0, sys_wll_open, sys_wll_close, sys_wll_sym, 0, 0
};
#endif /* __WINDOWS__ */
/* --- LOAD_ADD_ON() INTERFACE LOADER --- */
#ifdef __BEOS__
/* dynamic linking for BeOS */
#include <kernel/image.h>
static lt_module
sys_bedl_open (lt_user_data loader_data, const char *filename)
{
image_id image = 0;
if (filename)
{
image = load_add_on (filename);
}
else
{
image_info info;
int32 cookie = 0;
if (get_next_image_info (0, &cookie, &info) == B_OK)
image = load_add_on (info.name);
}
if (image <= 0)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_OPEN));
image = 0;
}
return (lt_module) image;
}
static int
sys_bedl_close (lt_user_data loader_data, lt_module module)
{
int errors = 0;
if (unload_add_on ((image_id) module) != B_OK)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_CLOSE));
++errors;
}
return errors;
}
static void *
sys_bedl_sym (lt_user_data loader_data, lt_module module, const char *symbol)
{
void *address = 0;
image_id image = (image_id) module;
if (get_image_symbol (image, symbol, B_SYMBOL_TYPE_ANY, address) != B_OK)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SYMBOL_NOT_FOUND));
address = 0;
}
return address;
}
static struct lt_user_dlloader sys_bedl = {
0, sys_bedl_open, sys_bedl_close, sys_bedl_sym, 0, 0
};
#endif /* __BEOS__ */
/* --- DLD_LINK() INTERFACE LOADER --- */
#if HAVE_DLD
/* dynamic linking with dld */
#if HAVE_DLD_H
#include <dld.h>
#endif
static lt_module
sys_dld_open (lt_user_data loader_data, const char *filename)
{
lt_module module = lt__strdup (filename);
if (dld_link (filename) != 0)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_OPEN));
FREE (module);
}
return module;
}
static int
sys_dld_close (lt_user_data loader_data, lt_module module)a
{
int errors = 0;
if (dld_unlink_by_file ((char*)(module), 1) != 0)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CANNOT_CLOSE));
++errors;
}
else
{
FREE (module);
}
return errors;
}
static void *
sys_dld_sym (lt_user_data loader_data, lt_module module, const char *symbol)
{
void *address = dld_get_func (symbol);
if (!address)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SYMBOL_NOT_FOUND));
}
return address;
}
static struct lt_user_dlloader sys_dld = {
0, sys_dld_open, sys_dld_close, sys_dld_sym, 0, 0
};
#endif /* HAVE_DLD */
/* --- DYLD() MACOSX/DARWIN INTERFACE LOADER --- */
#if HAVE_DYLD
#if HAVE_MACH_O_DYLD_H
#if !defined(__APPLE_CC__) && !defined(__MWERKS__) && !defined(__private_extern__)
/* Is this correct? Does it still function properly? */
#define __private_extern__ extern
#endif
# include <mach-o/dyld.h>
#endif
#include <mach-o/getsect.h>
/* We have to put some stuff here that isn't in older dyld.h files */
#ifndef ENUM_DYLD_BOOL
# define ENUM_DYLD_BOOL
# undef FALSE
# undef TRUE
enum DYLD_BOOL {
FALSE,
TRUE
};
#endif
#ifndef LC_REQ_DYLD
# define LC_REQ_DYLD 0x80000000
#endif
#ifndef LC_LOAD_WEAK_DYLIB
# define LC_LOAD_WEAK_DYLIB (0x18 | LC_REQ_DYLD)
#endif
static const struct mach_header * (*ltdl_NSAddImage)(const char *image_name, unsigned long options) = 0;
static NSSymbol (*ltdl_NSLookupSymbolInImage)(const struct mach_header *image,const char *symbolName, unsigned long options) = 0;
static enum DYLD_BOOL (*ltdl_NSIsSymbolNameDefinedInImage)(const struct mach_header *image, const char *symbolName) = 0;
static enum DYLD_BOOL (*ltdl_NSMakePrivateModulePublic)(NSModule module) = 0;
#ifndef NSADDIMAGE_OPTION_NONE
#define NSADDIMAGE_OPTION_NONE 0x0
#endif
#ifndef NSADDIMAGE_OPTION_RETURN_ON_ERROR
#define NSADDIMAGE_OPTION_RETURN_ON_ERROR 0x1
#endif
#ifndef NSADDIMAGE_OPTION_WITH_SEARCHING
#define NSADDIMAGE_OPTION_WITH_SEARCHING 0x2
#endif
#ifndef NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED
#define NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED 0x4
#endif
#ifndef NSADDIMAGE_OPTION_MATCH_FILENAME_BY_INSTALLNAME
#define NSADDIMAGE_OPTION_MATCH_FILENAME_BY_INSTALLNAME 0x8
#endif
#ifndef NSLOOKUPSYMBOLINIMAGE_OPTION_BIND
#define NSLOOKUPSYMBOLINIMAGE_OPTION_BIND 0x0
#endif
#ifndef NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW
#define NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW 0x1
#endif
#ifndef NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_FULLY
#define NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_FULLY 0x2
#endif
#ifndef NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR
#define NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR 0x4
#endif
static const char *
lt_int_dyld_error(char* othererror)
{
/* return the dyld error string, or the passed in error string if none */
NSLinkEditErrors ler;
int lerno;
const char *errstr;
const char *file;
NSLinkEditError(&ler,&lerno,&file,&errstr);
if (!errstr || !strlen(errstr)) errstr = othererror;
return errstr;
}
static const struct mach_header *
lt_int_dyld_get_mach_header_from_nsmodule(NSModule module)
{
/* There should probably be an apple dyld api for this */
int i=_dyld_image_count();
int j;
const char *modname=NSNameOfModule(module);
const struct mach_header *mh=NULL;
if (!modname) return NULL;
for (j = 0; j < i; j++)
{
if (!strcmp(_dyld_get_image_name(j),modname))
{
mh=_dyld_get_image_header(j);
break;
}
}
return mh;
}
static const char *
lt_int_dyld_lib_install_name(const struct mach_header *mh)
{
/* NSAddImage is also used to get the loaded image, but it only works if the lib
is installed, for uninstalled libs we need to check the install_names against
each other. Note that this is still broken if DYLD_IMAGE_SUFFIX is set and a
different lib was loaded as a result
*/
int j;
struct load_command *lc;
unsigned long offset = sizeof(struct mach_header);
const char* retStr=NULL;
for (j = 0; j < mh->ncmds; j++)
{
lc = (struct load_command*)(((unsigned long)mh) + offset);
if (LC_ID_DYLIB == lc->cmd)
{
retStr=(char*)(((struct dylib_command*)lc)->dylib.name.offset +
(unsigned long)lc);
}
offset += lc->cmdsize;
}
return retStr;
}
static const struct mach_header *
lt_int_dyld_match_loaded_lib_by_install_name(const char *name)
{
int i=_dyld_image_count();
int j;
const struct mach_header *mh=NULL;
const char *id=NULL;
for (j = 0; j < i; j++)
{
id=lt_int_dyld_lib_install_name(_dyld_get_image_header(j));
if ((id) && (!strcmp(id,name)))
{
mh=_dyld_get_image_header(j);
break;
}
}
return mh;
}
static NSSymbol
lt_int_dyld_NSlookupSymbolInLinkedLibs(const char *symbol,
const struct mach_header *mh)
{
/* Safe to assume our mh is good */
int j;
struct load_command *lc;
unsigned long offset = sizeof(struct mach_header);
NSSymbol retSym = 0;
const struct mach_header *mh1;
if ((ltdl_NSLookupSymbolInImage) && NSIsSymbolNameDefined(symbol) )
{
for (j = 0; j < mh->ncmds; j++)
{
lc = (struct load_command*)(((unsigned long)mh) + offset);
if ((LC_LOAD_DYLIB == lc->cmd) || (LC_LOAD_WEAK_DYLIB == lc->cmd))
{
mh1=lt_int_dyld_match_loaded_lib_by_install_name((char*)(((struct dylib_command*)lc)->dylib.name.offset +
(unsigned long)lc));
if (!mh1)
{
/* Maybe NSAddImage can find it */
mh1=ltdl_NSAddImage((char*)(((struct dylib_command*)lc)->dylib.name.offset +
(unsigned long)lc),
NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED +
NSADDIMAGE_OPTION_WITH_SEARCHING +
NSADDIMAGE_OPTION_RETURN_ON_ERROR );
}
if (mh1)
{
retSym = ltdl_NSLookupSymbolInImage(mh1,
symbol,
NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW
| NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR
);
if (retSym) break;
}
}
offset += lc->cmdsize;
}
}
return retSym;
}
static int
sys_dyld_init (void)
{
int retCode = 0;
int err = 0;
if (!_dyld_present()) {
retCode=1;
}
else {
err = _dyld_func_lookup("__dyld_NSAddImage",(unsigned long*)&ltdl_NSAddImage);
err = _dyld_func_lookup("__dyld_NSLookupSymbolInImage",(unsigned long*)&ltdl_NSLookupSymbolInImage);
err = _dyld_func_lookup("__dyld_NSIsSymbolNameDefinedInImage",(unsigned long*)&ltdl_NSIsSymbolNameDefinedInImage);
err = _dyld_func_lookup("__dyld_NSMakePrivateModulePublic",(unsigned long*)&ltdl_NSMakePrivateModulePublic);
}
return retCode;
}
static lt_module
sys_dyld_open (lt_user_data loader_data, const char *filename)
{
lt_module module = 0;
NSObjectFileImage ofi = 0;
NSObjectFileImageReturnCode ofirc;
if (!filename)
return (lt_module)-1;
ofirc = NSCreateObjectFileImageFromFile(filename, &ofi);
switch (ofirc)
{
case NSObjectFileImageSuccess:
module = NSLinkModule(ofi, filename,
NSLINKMODULE_OPTION_RETURN_ON_ERROR
| NSLINKMODULE_OPTION_PRIVATE
| NSLINKMODULE_OPTION_BINDNOW);
NSDestroyObjectFileImage(ofi);
if (module)
ltdl_NSMakePrivateModulePublic(module);
break;
case NSObjectFileImageInappropriateFile:
if (ltdl_NSIsSymbolNameDefinedInImage && ltdl_NSLookupSymbolInImage)
{
module = (lt_module)ltdl_NSAddImage(filename, NSADDIMAGE_OPTION_RETURN_ON_ERROR);
break;
}
default:
LT_DLMUTEX_SETERROR (lt_int_dyld_error(LT_DLSTRERROR(CANNOT_OPEN)));
return 0;
}
if (!module) LT_DLMUTEX_SETERROR (lt_int_dyld_error(LT_DLSTRERROR(CANNOT_OPEN)));
return module;
}
static int
sys_dyld_close (lt_user_data loader_data, lt_module module)
{
int retCode = 0;
int flags = 0;
if (module == (lt_module)-1) return 0;
#ifdef __BIG_ENDIAN__
if (((struct mach_header *)module)->magic == MH_MAGIC)
#else
if (((struct mach_header *)module)->magic == MH_CIGAM)
#endif
{
LT_DLMUTEX_SETERROR("Can not close a dylib");
retCode = 1;
}
else
{
#if 1
/* Currently, if a module contains c++ static destructors and it is unloaded, we
get a segfault in atexit(), due to compiler and dynamic loader differences of
opinion, this works around that.
*/
if ((const struct section *)NULL !=
getsectbynamefromheader(lt_int_dyld_get_mach_header_from_nsmodule(module),
"__DATA","__mod_term_func"))
{
flags += NSUNLINKMODULE_OPTION_KEEP_MEMORY_MAPPED;
}
#endif
#ifdef __ppc__
flags += NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES;
#endif
if (!NSUnLinkModule(module,flags))
{
retCode=1;
LT_DLMUTEX_SETERROR (lt_int_dyld_error(LT_DLSTRERROR(CANNOT_CLOSE)));
}
}
return retCode;
}
static void *
sys_dyld_sym (lt_user_data loader_data, lt_module module, const char *symbol)
{
void *address = 0;
NSSymbol *nssym = 0;
void *unused;
const struct mach_header *mh=NULL;
char saveError[256] = "Symbol not found";
if (module == (lt_module)-1)
{
_dyld_lookup_and_bind(symbol,(unsigned long*)&address,&unused);
return address;
}
#ifdef __BIG_ENDIAN__
if (((struct mach_header *)module)->magic == MH_MAGIC)
#else
if (((struct mach_header *)module)->magic == MH_CIGAM)
#endif
{
if (ltdl_NSIsSymbolNameDefinedInImage && ltdl_NSLookupSymbolInImage)
{
mh=module;
if (ltdl_NSIsSymbolNameDefinedInImage((struct mach_header*)module,symbol))
{
nssym = ltdl_NSLookupSymbolInImage((struct mach_header*)module,
symbol,
NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW
| NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR
);
}
}
}
else {
nssym = NSLookupSymbolInModule(module, symbol);
}
if (!nssym)
{
strncpy(saveError, lt_int_dyld_error(LT_DLSTRERROR(SYMBOL_NOT_FOUND)), 255);
saveError[255] = 0;
if (!mh) mh=lt_int_dyld_get_mach_header_from_nsmodule(module);
nssym = lt_int_dyld_NSlookupSymbolInLinkedLibs(symbol,mh);
}
if (!nssym)
{
LT_DLMUTEX_SETERROR (saveError);
return NULL;
}
return NSAddressOfSymbol(nssym);
}
static struct lt_user_dlloader sys_dyld =
{ "_", sys_dyld_open, sys_dyld_close, sys_dyld_sym, 0, 0 };
#endif /* HAVE_DYLD */
/* --- DLPREOPEN() INTERFACE LOADER --- */
/* emulate dynamic linking using preloaded_symbols */
typedef struct lt_dlsymlists_t
{
struct lt_dlsymlists_t *next;
const lt_dlsymlist *syms;
} lt_dlsymlists_t;
static const lt_dlsymlist *default_preloaded_symbols = 0;
static lt_dlsymlists_t *preloaded_symbols = 0;
static int
presym_init (lt_user_data loader_data)
{
int errors = 0;
LT_DLMUTEX_LOCK ();
preloaded_symbols = 0;
if (default_preloaded_symbols)
{
errors = lt_dlpreload (default_preloaded_symbols);
}
LT_DLMUTEX_UNLOCK ();
return errors;
}
static int
presym_free_symlists (void)
{
lt_dlsymlists_t *lists;
LT_DLMUTEX_LOCK ();
lists = preloaded_symbols;
while (lists)
{
lt_dlsymlists_t *tmp = lists;
lists = lists->next;
FREE (tmp);
}
preloaded_symbols = 0;
LT_DLMUTEX_UNLOCK ();
return 0;
}
static int
presym_exit (lt_user_data loader_data)
{
presym_free_symlists ();
return 0;
}
static int
presym_add_symlist (const lt_dlsymlist *preloaded)
{
lt_dlsymlists_t *tmp;
lt_dlsymlists_t *lists;
int errors = 0;
LT_DLMUTEX_LOCK ();
lists = preloaded_symbols;
while (lists)
{
if (lists->syms == preloaded)
{
goto done;
}
lists = lists->next;
}
tmp = MALLOC (lt_dlsymlists_t, 1);
if (tmp)
{
memset (tmp, 0, sizeof(lt_dlsymlists_t));
tmp->syms = preloaded;
tmp->next = preloaded_symbols;
preloaded_symbols = tmp;
}
else
{
++errors;
}
done:
LT_DLMUTEX_UNLOCK ();
return errors;
}
static lt_module
presym_open (lt_user_data loader_data, const char *filename)
{
lt_dlsymlists_t *lists;
lt_module module = (lt_module) 0;
LT_DLMUTEX_LOCK ();
lists = preloaded_symbols;
if (!lists)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (NO_SYMBOLS));
goto done;
}
/* Can't use NULL as the reflective symbol header, as NULL is
used to mark the end of the entire symbol list. Self-dlpreopened
symbols follow this magic number, chosen to be an unlikely
clash with a real module name. */
if (!filename)
{
filename = "@PROGRAM@";
}
while (lists)
{
const lt_dlsymlist *syms = lists->syms;
while (syms->name)
{
if (!syms->address && strcmp(syms->name, filename) == 0)
{
module = (lt_module) syms;
goto done;
}
++syms;
}
lists = lists->next;
}
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (FILE_NOT_FOUND));
done:
LT_DLMUTEX_UNLOCK ();
return module;
}
static int
presym_close (lt_user_data loader_data, lt_module module)
{
/* Just to silence gcc -Wall */
module = 0;
return 0;
}
static void *
presym_sym (lt_user_data loader_data, lt_module module, const char *symbol)
{
lt_dlsymlist *syms = (lt_dlsymlist*) module;
++syms;
while (syms->address)
{
if (strcmp(syms->name, symbol) == 0)
{
return syms->address;
}
++syms;
}
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SYMBOL_NOT_FOUND));
return 0;
}
static struct lt_user_dlloader presym = {
0, presym_open, presym_close, presym_sym, presym_exit, 0
};
/* --- DYNAMIC MODULE LOADING --- */
/* The type of a function used at each iteration of foreach_dirinpath(). */
typedef int foreach_callback_func (char *filename, void *data1,
void *data2);
static int foreach_dirinpath (const char *search_path,
const char *base_name,
foreach_callback_func *func,
void *data1, void *data2);
static int find_file_callback (char *filename, void *data,
void *ignored);
static int find_handle_callback (char *filename, void *data,
void *ignored);
static int foreachfile_callback (char *filename, void *data1,
void *data2);
static int canonicalize_path (const char *path, char **pcanonical);
static int argzize_path (const char *path,
char **pargz, size_t *pargz_len);
static FILE *find_file (const char *search_path,
const char *base_name, char **pdir);
static lt_dlhandle *find_handle (const char *search_path,
const char *base_name,
lt_dlhandle *handle);
static int find_module (lt_dlhandle *handle, const char *dir,
const char *libdir, const char *dlname,
const char *old_name, int installed);
static int load_deplibs (lt_dlhandle handle, char *deplibs);
static int trim (char **dest, const char *str);
static int try_dlopen (lt_dlhandle *handle,
const char *filename);
static int tryall_dlopen (lt_dlhandle *handle,
const char *filename);
static int unload_deplibs (lt_dlhandle handle);
static int lt_argz_insert (char **pargz, size_t *pargz_len,
char *before, const char *entry);
static int lt_argz_insertinorder (char **pargz, size_t *pargz_len,
const char *entry);
static int lt_argz_insertdir (char **pargz, size_t *pargz_len,
const char *dirnam, struct dirent *dp);
static int lt_dlpath_insertdir (char **ppath, char *before,
const char *dir);
static int list_files_by_dir (const char *dirnam,
char **pargz, size_t *pargz_len);
static int file_not_found (void);
static char *user_search_path= 0;
static lt_dlloader *loaders = 0;
static lt_dlhandle handles = 0;
static int initialized = 0;
/* Our memory failure callback sets the error message to be passed back
up to the client, so we must be careful to return from mallocation
callers if allocation fails (as this callback returns!!). */
void
lt__alloc_die_callback (void)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (NO_MEMORY));
}
/* Initialize libltdl. */
int
lt_dlinit (void)
{
int errors = 0;
LT_DLMUTEX_LOCK ();
/* Initialize only at first call. */
if (++initialized == 1)
{
lt__alloc_die = lt__alloc_die_callback;
handles = 0;
user_search_path = 0; /* empty search path */
/* Append the available loaders to the internal list in the order
they should be used -- if the first fails, then try again with
the next loader in the chain. */
# define LOADER_APPEND 0
errors += lt_dlloader_add (LOADER_APPEND, &presym, "dlpreload");
#if HAVE_DLD
errors += lt_dlloader_add (LOADER_APPEND, &sys_dld, "dld");
#endif
#if HAVE_DYLD
errors += lt_dlloader_add (LOADER_APPEND, &sys_dyld, "dyld");
errors += sys_dyld_init();
#endif
#ifdef __BEOS__
errors += lt_dlloader_add (LOADER_APPEND, &sys_bedl, "dlopen");
#endif
#if HAVE_SHL_LOAD
errors += lt_dlloader_add (LOADER_APPEND, &sys_shl, "dlopen");
#endif
#if HAVE_LIBDL
errors += lt_dlloader_add (LOADER_APPEND, &sys_dl, "dlopen");
#endif
#if defined(__WINDOWS__) || defined(__CYGWIN__)
errors += lt_dlloader_add (LOADER_APPEND, &sys_wll, "dlopen");
#endif
if (presym_init (presym.dlloader_data))
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INIT_LOADER));
++errors;
}
else if (errors != 0)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (DLOPEN_NOT_SUPPORTED));
++errors;
}
}
LT_DLMUTEX_UNLOCK ();
return errors;
}
int
lt_dlpreload (const lt_dlsymlist *preloaded)
{
int errors = 0;
if (preloaded)
{
errors = presym_add_symlist (preloaded);
}
else
{
presym_free_symlists();
LT_DLMUTEX_LOCK ();
if (default_preloaded_symbols)
{
errors = lt_dlpreload (default_preloaded_symbols);
}
LT_DLMUTEX_UNLOCK ();
}
return errors;
}
int
lt_dlpreload_default (const lt_dlsymlist *preloaded)
{
LT_DLMUTEX_LOCK ();
default_preloaded_symbols = preloaded;
LT_DLMUTEX_UNLOCK ();
return 0;
}
int
lt_dlexit (void)
{
/* shut down libltdl */
lt_dlloader *loader;
int errors = 0;
LT_DLMUTEX_LOCK ();
loader = loaders;
if (!initialized)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SHUTDOWN));
++errors;
goto done;
}
/* shut down only at last call. */
if (--initialized == 0)
{
int level;
while (handles && LT_DLIS_RESIDENT (handles))
{
handles = handles->next;
}
/* close all modules */
for (level = 1; handles; ++level)
{
lt_dlhandle cur = handles;
int saw_nonresident = 0;
while (cur)
{
lt_dlhandle tmp = cur;
cur = cur->next;
if (!LT_DLIS_RESIDENT (tmp))
saw_nonresident = 1;
if (!LT_DLIS_RESIDENT (tmp) && tmp->info.ref_count <= level)
{
if (lt_dlclose (tmp))
{
++errors;
}
}
}
/* done if only resident modules are left */
if (!saw_nonresident)
break;
}
/* close all loaders */
while (loader)
{
lt_dlloader *next = loader->next;
lt_user_data data = loader->dlloader_data;
if (loader->dlloader_exit && loader->dlloader_exit (data))
{
++errors;
}
MEMREASSIGN (loader, next);
}
loaders = 0;
}
done:
LT_DLMUTEX_UNLOCK ();
return errors;
}
static int
tryall_dlopen (lt_dlhandle *handle, const char *filename)
{
lt_dlhandle cur;
lt_dlloader *loader;
const char *saved_error;
int errors = 0;
LT_DLMUTEX_GETERROR (saved_error);
LT_DLMUTEX_LOCK ();
cur = handles;
loader = loaders;
/* check whether the module was already opened */
while (cur)
{
/* try to dlopen the program itself? */
if (!cur->info.filename && !filename)
{
break;
}
if (cur->info.filename && filename
&& strcmp (cur->info.filename, filename) == 0)
{
break;
}
cur = cur->next;
}
if (cur)
{
++cur->info.ref_count;
*handle = cur;
goto done;
}
cur = *handle;
if (filename)
{
/* Comment out the check of file permissions using access.
This call seems to always return -1 with error EACCES.
*/
/* We need to catch missing file errors early so that
file_not_found() can detect what happened.
if (access (filename, R_OK) != 0)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (FILE_NOT_FOUND));
++errors;
goto done;
} */
cur->info.filename = lt__strdup (filename);
if (!cur->info.filename)
{
++errors;
goto done;
}
}
else
{
cur->info.filename = 0;
}
while (loader)
{
lt_user_data data = loader->dlloader_data;
cur->module = loader->module_open (data, filename);
if (cur->module != 0)
{
break;
}
loader = loader->next;
}
if (!loader)
{
FREE (cur->info.filename);
++errors;
goto done;
}
cur->loader = loader;
LT_DLMUTEX_SETERROR (saved_error);
done:
LT_DLMUTEX_UNLOCK ();
return errors;
}
static int
tryall_dlopen_module (lt_dlhandle *handle, const char *prefix,
const char *dirname, const char *dlname)
{
int error = 0;
char *filename = 0;
size_t filename_len = 0;
size_t dirname_len = LT_STRLEN (dirname);
assert (handle);
assert (dirname);
assert (dlname);
#ifdef LT_DIRSEP_CHAR
/* Only canonicalized names (i.e. with DIRSEP chars already converted)
should make it into this function: */
assert (strchr (dirname, LT_DIRSEP_CHAR) == 0);
#endif
if (dirname_len > 0)
if (dirname[dirname_len -1] == '/')
--dirname_len;
filename_len = dirname_len + 1 + LT_STRLEN (dlname);
/* Allocate memory, and combine DIRNAME and MODULENAME into it.
The PREFIX (if any) is handled below. */
filename = MALLOC (char, dirname_len + 1 + filename_len + 1);
if (!filename)
return 1;
sprintf (filename, "%.*s/%s", (int) dirname_len, dirname, dlname);
/* Now that we have combined DIRNAME and MODULENAME, if there is
also a PREFIX to contend with, simply recurse with the arguments
shuffled. Otherwise, attempt to open FILENAME as a module. */
if (prefix)
{
error += tryall_dlopen_module (handle,
(const char *) 0, prefix, filename);
}
else if (tryall_dlopen (handle, filename) != 0)
{
++error;
}
FREE (filename);
return error;
}
static int
find_module (lt_dlhandle *handle, const char *dir, const char *libdir,
const char *dlname, const char *old_name, int installed)
{
/* Try to open the old library first; if it was dlpreopened,
we want the preopened version of it, even if a dlopenable
module is available. */
if (old_name && tryall_dlopen (handle, old_name) == 0)
{
return 0;
}
/* Try to open the dynamic library. */
if (dlname)
{
/* try to open the installed module */
if (installed && libdir)
{
if (tryall_dlopen_module (handle,
(const char *) 0, libdir, dlname) == 0)
return 0;
}
/* try to open the not-installed module */
if (!installed)
{
if (tryall_dlopen_module (handle, dir, objdir, dlname) == 0)
return 0;
}
/* maybe it was moved to another directory */
{
if (tryall_dlopen_module (handle,
(const char *) 0, dir, dlname) == 0)
return 0;
}
}
return 1;
}
static int
canonicalize_path (const char *path, char **pcanonical)
{
char *canonical = 0;
assert (path && *path);
assert (pcanonical);
canonical = MALLOC (char, 1+ LT_STRLEN (path));
if (!canonical)
return 1;
{
size_t dest = 0;
size_t src;
for (src = 0; path[src] != LT_EOS_CHAR; ++src)
{
/* Path separators are not copied to the beginning or end of
the destination, or if another separator would follow
immediately. */
if (path[src] == LT_PATHSEP_CHAR)
{
if ((dest == 0)
|| (path[1+ src] == LT_PATHSEP_CHAR)
|| (path[1+ src] == LT_EOS_CHAR))
continue;
}
/* Anything other than a directory separator is copied verbatim. */
if ((path[src] != '/')
#ifdef LT_DIRSEP_CHAR
&& (path[src] != LT_DIRSEP_CHAR)
#endif
)
{
canonical[dest++] = path[src];
}
/* Directory separators are converted and copied only if they are
not at the end of a path -- i.e. before a path separator or
NULL terminator. */
else if ((path[1+ src] != LT_PATHSEP_CHAR)
&& (path[1+ src] != LT_EOS_CHAR)
#ifdef LT_DIRSEP_CHAR
&& (path[1+ src] != LT_DIRSEP_CHAR)
#endif
&& (path[1+ src] != '/'))
{
canonical[dest++] = '/';
}
}
/* Add an end-of-string marker at the end. */
canonical[dest] = LT_EOS_CHAR;
}
/* Assign new value. */
*pcanonical = canonical;
return 0;
}
static int
argzize_path (const char *path, char **pargz, size_t *pargz_len)
{
error_t error;
assert (path);
assert (pargz);
assert (pargz_len);
if ((error = argz_create_sep (path, LT_PATHSEP_CHAR, pargz, pargz_len)))
{
switch (error)
{
case ENOMEM:
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (NO_MEMORY));
break;
default:
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (UNKNOWN));
break;
}
return 1;
}
return 0;
}
/* Repeatedly call FUNC with each LT_PATHSEP_CHAR delimited element
of SEARCH_PATH and references to DATA1 and DATA2, until FUNC returns
non-zero or all elements are exhausted. If BASE_NAME is non-NULL,
it is appended to each SEARCH_PATH element before FUNC is called. */
static int
foreach_dirinpath (const char *search_path, const char *base_name,
foreach_callback_func *func, void *data1, void *data2)
{
int result = 0;
int filenamesize = 0;
size_t lenbase = LT_STRLEN (base_name);
size_t argz_len = 0;
char *argz = 0;
char *filename = 0;
char *canonical = 0;
LT_DLMUTEX_LOCK ();
if (!search_path || !*search_path)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (FILE_NOT_FOUND));
goto cleanup;
}
if (canonicalize_path (search_path, &canonical) != 0)
goto cleanup;
if (argzize_path (canonical, &argz, &argz_len) != 0)
goto cleanup;
{
char *dir_name = 0;
while ((dir_name = argz_next (argz, argz_len, dir_name)))
{
size_t lendir = LT_STRLEN (dir_name);
if (lendir +1 +lenbase >= filenamesize)
{
FREE (filename);
filenamesize = lendir +1 +lenbase +1; /* "/d" + '/' + "f" + '\0' */
filename = MALLOC (char, filenamesize);
if (!filename)
goto cleanup;
}
assert (filenamesize > lendir);
strcpy (filename, dir_name);
if (base_name && *base_name)
{
if (filename[lendir -1] != '/')
filename[lendir++] = '/';
strcpy (filename +lendir, base_name);
}
if ((result = (*func) (filename, data1, data2)))
{
break;
}
}
}
cleanup:
FREE (argz);
FREE (canonical);
FREE (filename);
LT_DLMUTEX_UNLOCK ();
return result;
}
/* If FILEPATH can be opened, store the name of the directory component
in DATA1, and the opened FILE* structure address in DATA2. Otherwise
DATA1 is unchanged, but DATA2 is set to a pointer to NULL. */
static int
find_file_callback (char *filename, void *data1, void *data2)
{
char **pdir = (char **) data1;
FILE **pfile = (FILE **) data2;
int is_done = 0;
assert (filename && *filename);
assert (pdir);
assert (pfile);
if ((*pfile = fopen (filename, LT_READTEXT_MODE)))
{
char *dirend = strrchr (filename, '/');
if (dirend > filename)
*dirend = LT_EOS_CHAR;
FREE (*pdir);
*pdir = lt__strdup (filename);
is_done = (*pdir == 0) ? -1 : 1;
}
return is_done;
}
static FILE *
find_file (const char *search_path, const char *base_name, char **pdir)
{
FILE *file = 0;
foreach_dirinpath (search_path, base_name, find_file_callback, pdir, &file);
return file;
}
static int
find_handle_callback (char *filename, void *data, void *ignored)
{
lt_dlhandle *handle = (lt_dlhandle *) data;
int notfound = access (filename, R_OK);
/* Bail out if file cannot be read... */
if (notfound)
return 0;
/* Try to dlopen the file, but do not continue searching in any
case. */
if (tryall_dlopen (handle, filename) != 0)
*handle = 0;
return 1;
}
/* If HANDLE was found return it, otherwise return 0. If HANDLE was
found but could not be opened, *HANDLE will be set to 0. */
static lt_dlhandle *
find_handle (const char *search_path, const char *base_name,
lt_dlhandle *handle)
{
if (!search_path)
return 0;
if (!foreach_dirinpath (search_path, base_name, find_handle_callback,
handle, 0))
return 0;
return handle;
}
static int
load_deplibs (lt_dlhandle handle, char *deplibs)
{
#if LTDL_DLOPEN_DEPLIBS
char *p, *save_search_path = 0;
int depcount = 0;
int i;
char **names = 0;
#endif
int errors = 0;
handle->depcount = 0;
#if LTDL_DLOPEN_DEPLIBS
if (!deplibs)
{
return errors;
}
++errors;
LT_DLMUTEX_LOCK ();
if (user_search_path)
{
save_search_path = lt__strdup (user_search_path);
if (!save_search_path)
goto cleanup;
}
/* extract search paths and count deplibs */
p = deplibs;
while (*p)
{
if (!isspace ((int) *p))
{
char *end = p+1;
while (*end && !isspace((int) *end))
{
++end;
}
if (strncmp(p, "-L", 2) == 0 || strncmp(p, "-R", 2) == 0)
{
char save = *end;
*end = 0; /* set a temporary string terminator */
if (lt_dladdsearchdir(p+2))
{
goto cleanup;
}
*end = save;
}
else
{
++depcount;
}
p = end;
}
else
{
++p;
}
}
/* restore the old search path */
MEMREASSIGN (user_search_path, save_search_path);
LT_DLMUTEX_UNLOCK ();
if (!depcount)
{
errors = 0;
goto cleanup;
}
names = MALLOC (char *, depcount);
if (!names)
goto cleanup;
/* now only extract the actual deplibs */
depcount = 0;
p = deplibs;
while (*p)
{
if (isspace ((int) *p))
{
++p;
}
else
{
char *end = p+1;
while (*end && !isspace ((int) *end))
{
++end;
}
if (strncmp(p, "-L", 2) != 0 && strncmp(p, "-R", 2) != 0)
{
char *name;
char save = *end;
*end = 0; /* set a temporary string terminator */
if (strncmp(p, "-l", 2) == 0)
{
size_t name_len = 3+ /* "lib" */ LT_STRLEN (p + 2);
name = MALLOC (char, 1+ name_len);
if (name)
sprintf (name, "lib%s", p+2);
}
else
name = strdup(p);
if (!name)
goto cleanup_names;
names[depcount++] = name;
*end = save;
}
p = end;
}
}
/* load the deplibs (in reverse order)
At this stage, don't worry if the deplibs do not load correctly,
they may already be statically linked into the loading application
for instance. There will be a more enlightening error message
later on if the loaded module cannot resolve all of its symbols. */
if (depcount)
{
int j = 0;
handle->deplibs = (lt_dlhandle*) MALLOC (lt_dlhandle *, depcount);
if (!handle->deplibs)
goto cleanup;
for (i = 0; i < depcount; ++i)
{
handle->deplibs[j] = lt_dlopenext(names[depcount-1-i]);
if (handle->deplibs[j])
{
++j;
}
}
handle->depcount = j; /* Number of successfully loaded deplibs */
errors = 0;
}
cleanup_names:
for (i = 0; i < depcount; ++i)
{
FREE (names[i]);
}
cleanup:
FREE (names);
#endif
return errors;
}
static int
unload_deplibs (lt_dlhandle handle)
{
int i;
int errors = 0;
if (handle->depcount)
{
for (i = 0; i < handle->depcount; ++i)
{
if (!LT_DLIS_RESIDENT (handle->deplibs[i]))
{
errors += lt_dlclose (handle->deplibs[i]);
}
}
}
return errors;
}
static int
trim (char **dest, const char *str)
{
/* remove the leading and trailing "'" from str
and store the result in dest */
const char *end = strrchr (str, '\'');
size_t len = LT_STRLEN (str);
char *tmp;
FREE (*dest);
if (len > 3 && str[0] == '\'')
{
tmp = MALLOC (char, end - str);
if (!tmp)
return 1;
strncpy(tmp, &str[1], (end - str) - 1);
tmp[len-3] = LT_EOS_CHAR;
*dest = tmp;
}
else
{
*dest = 0;
}
return 0;
}
static int
try_dlopen (lt_dlhandle *phandle, const char *filename)
{
const char * ext = 0;
const char * saved_error = 0;
char * canonical = 0;
char * base_name = 0;
char * dir = 0;
char * name = 0;
int errors = 0;
lt_dlhandle newhandle;
assert (phandle);
assert (*phandle == 0);
LT_DLMUTEX_GETERROR (saved_error);
/* dlopen self? */
if (!filename)
{
*phandle = (lt_dlhandle) MALLOC (struct lt_dlhandle_struct, 1);
if (*phandle == 0)
return 1;
memset (*phandle, 0, sizeof(struct lt_dlhandle_struct));
newhandle = *phandle;
/* lt_dlclose()ing yourself is very bad! Disallow it. */
LT_DLSET_FLAG (*phandle, LT_DLRESIDENT_FLAG);
if (tryall_dlopen (&newhandle, 0) != 0)
{
FREE (*phandle);
return 1;
}
goto register_handle;
}
assert (filename && *filename);
/* Doing this immediately allows internal functions to safely
assume only canonicalized paths are passed. */
if (canonicalize_path (filename, &canonical) != 0)
{
++errors;
goto cleanup;
}
/* If the canonical module name is a path (relative or absolute)
then split it into a directory part and a name part. */
base_name = strrchr (canonical, '/');
if (base_name)
{
size_t dirlen = (1+ base_name) - canonical;
dir = MALLOC (char, 1+ dirlen);
if (!dir)
{
++errors;
goto cleanup;
}
strncpy (dir, canonical, dirlen);
dir[dirlen] = LT_EOS_CHAR;
++base_name;
}
else
MEMREASSIGN (base_name, canonical);
assert (base_name && *base_name);
/* Check whether we are opening a libtool module (.la extension). */
ext = strrchr (base_name, '.');
if (ext && strcmp (ext, archive_ext) == 0)
{
/* this seems to be a libtool module */
FILE * file = 0;
char * dlname = 0;
char * old_name = 0;
char * libdir = 0;
char * deplibs = 0;
char * line = 0;
size_t line_len;
/* if we can't find the installed flag, it is probably an
installed libtool archive, produced with an old version
of libtool */
int installed = 1;
/* extract the module name from the file name */
name = MALLOC (char, ext - base_name + 1);
if (!name)
{
++errors;
goto cleanup;
}
/* canonicalize the module name */
{
size_t i;
for (i = 0; i < ext - base_name; ++i)
{
if (isalnum ((int)(base_name[i])))
{
name[i] = base_name[i];
}
else
{
name[i] = '_';
}
}
name[ext - base_name] = LT_EOS_CHAR;
}
/* Now try to open the .la file. If there is no directory name
component, try to find it first in user_search_path and then other
prescribed paths. Otherwise (or in any case if the module was not
yet found) try opening just the module name as passed. */
if (!dir)
{
const char *search_path;
LT_DLMUTEX_LOCK ();
search_path = user_search_path;
if (search_path)
file = find_file (user_search_path, base_name, &dir);
LT_DLMUTEX_UNLOCK ();
if (!file)
{
search_path = getenv (LTDL_SEARCHPATH_VAR);
if (search_path)
file = find_file (search_path, base_name, &dir);
}
#ifdef LTDL_SHLIBPATH_VAR
if (!file)
{
search_path = getenv (LTDL_SHLIBPATH_VAR);
if (search_path)
file = find_file (search_path, base_name, &dir);
}
#endif
#ifdef LTDL_SYSSEARCHPATH
if (!file && sys_search_path)
{
file = find_file (sys_search_path, base_name, &dir);
}
#endif
}
if (!file)
{
file = fopen (filename, LT_READTEXT_MODE);
}
/* If we didn't find the file by now, it really isn't there. Set
the status flag, and bail out. */
if (!file)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (FILE_NOT_FOUND));
++errors;
goto cleanup;
}
line_len = LT_FILENAME_MAX;
line = MALLOC (char, line_len);
if (!line)
{
fclose (file);
++errors;
goto cleanup;
}
/* read the .la file */
while (!feof (file))
{
if (!fgets (line, (int) line_len, file))
{
break;
}
/* Handle the case where we occasionally need to read a line
that is longer than the initial buffer size. */
while ((line[LT_STRLEN(line) -1] != '\n') && (!feof (file)))
{
line = REALLOC (char, line, line_len *2);
if (!line)
{
fclose (file);
++errors;
goto cleanup;
}
if (!fgets (&line[line_len -1], (int) line_len +1, file))
{
break;
}
line_len *= 2;
}
if (line[0] == '\n' || line[0] == '#')
{
continue;
}
#undef STR_DLNAME
#define STR_DLNAME "dlname="
if (strncmp (line, STR_DLNAME, sizeof (STR_DLNAME) - 1) == 0)
{
errors += trim (&dlname, &line[sizeof (STR_DLNAME) - 1]);
}
#undef STR_OLD_LIBRARY
#define STR_OLD_LIBRARY "old_library="
else if (strncmp (line, STR_OLD_LIBRARY,
sizeof (STR_OLD_LIBRARY) - 1) == 0)
{
errors += trim (&old_name, &line[sizeof (STR_OLD_LIBRARY) - 1]);
}
#undef STR_LIBDIR
#define STR_LIBDIR "libdir="
else if (strncmp (line, STR_LIBDIR, sizeof (STR_LIBDIR) - 1) == 0)
{
errors += trim (&libdir, &line[sizeof(STR_LIBDIR) - 1]);
}
#undef STR_DL_DEPLIBS
#define STR_DL_DEPLIBS "dependency_libs="
else if (strncmp (line, STR_DL_DEPLIBS,
sizeof (STR_DL_DEPLIBS) - 1) == 0)
{
errors += trim (&deplibs, &line[sizeof (STR_DL_DEPLIBS) - 1]);
}
else if (strcmp (line, "installed=yes\n") == 0)
{
installed = 1;
}
else if (strcmp (line, "installed=no\n") == 0)
{
installed = 0;
}
#undef STR_LIBRARY_NAMES
#define STR_LIBRARY_NAMES "library_names="
else if (! dlname && strncmp (line, STR_LIBRARY_NAMES,
sizeof (STR_LIBRARY_NAMES) - 1) == 0)
{
char *last_libname;
errors += trim (&dlname, &line[sizeof (STR_LIBRARY_NAMES) - 1]);
if (!errors
&& dlname
&& (last_libname = strrchr (dlname, ' ')) != 0)
{
last_libname = strdup (last_libname + 1);
if (!last_libname)
{
++errors;
goto cleanup;
}
MEMREASSIGN (dlname, last_libname);
}
}
if (errors)
break;
}
fclose (file);
FREE (line);
/* allocate the handle */
*phandle = (lt_dlhandle) malloc (sizeof (struct lt_dlhandle_struct));
if (*phandle == 0)
++errors;
if (errors)
{
FREE (dlname);
FREE (old_name);
FREE (libdir);
FREE (deplibs);
FREE (*phandle);
goto cleanup;
}
assert (*phandle);
memset (*phandle, 0, sizeof(struct lt_dlhandle_struct));
if (load_deplibs (*phandle, deplibs) == 0)
{
newhandle = *phandle;
/* find_module may replace newhandle */
if (find_module (&newhandle, dir, libdir, dlname, old_name, installed))
{
unload_deplibs (*phandle);
++errors;
}
}
else
{
++errors;
}
FREE (dlname);
FREE (old_name);
FREE (libdir);
FREE (deplibs);
if (errors)
{
FREE (*phandle);
goto cleanup;
}
if (*phandle != newhandle)
{
unload_deplibs (*phandle);
}
}
else
{
/* not a libtool module */
*phandle = (lt_dlhandle) MALLOC (struct lt_dlhandle_struct, 1);
if (*phandle == 0)
{
++errors;
goto cleanup;
}
memset (*phandle, 0, sizeof (struct lt_dlhandle_struct));
newhandle = *phandle;
/* If the module has no directory name component, try to find it
first in user_search_path and then other prescribed paths.
Otherwise (or in any case if the module was not yet found) try
opening just the module name as passed. */
if ((dir || (!find_handle (user_search_path, base_name, &newhandle)
&& !find_handle (getenv (LTDL_SEARCHPATH_VAR), base_name,
&newhandle)
#ifdef LTDL_SHLIBPATH_VAR
&& !find_handle (getenv (LTDL_SHLIBPATH_VAR), base_name,
&newhandle)
#endif
#ifdef LTDL_SYSSEARCHPATH
&& !find_handle (sys_search_path, base_name, &newhandle)
#endif
)))
{
if (tryall_dlopen (&newhandle, filename) != 0)
{
newhandle = NULL;
}
}
if (!newhandle)
{
FREE (*phandle);
++errors;
goto cleanup;
}
}
register_handle:
MEMREASSIGN (*phandle, newhandle);
if ((*phandle)->info.ref_count == 0)
{
(*phandle)->info.ref_count = 1;
MEMREASSIGN ((*phandle)->info.name, name);
LT_DLMUTEX_LOCK ();
(*phandle)->next = handles;
handles = *phandle;
LT_DLMUTEX_UNLOCK ();
}
LT_DLMUTEX_SETERROR (saved_error);
cleanup:
FREE (dir);
FREE (name);
FREE (canonical);
return errors;
}
lt_dlhandle
lt_dlopen (const char *filename)
{
lt_dlhandle handle = 0;
/* Just incase we missed a code path in try_dlopen() that reports
an error, but forgets to reset handle... */
if (try_dlopen (&handle, filename) != 0)
return 0;
return handle;
}
/* If the last error messge store was `FILE_NOT_FOUND', then return
non-zero. */
static int
file_not_found (void)
{
const char *error = 0;
LT_DLMUTEX_GETERROR (error);
if (error == LT_DLSTRERROR (FILE_NOT_FOUND))
return 1;
return 0;
}
/* If FILENAME has an ARCHIVE_EXT or SHLIB_EXT extension, try to
open the FILENAME as passed. Otherwise try appending ARCHIVE_EXT,
and if a file is still not found try again with SHLIB_EXT appended
instead. */
lt_dlhandle
lt_dlopenext (const char *filename)
{
lt_dlhandle handle = 0;
char * tmp = 0;
char * ext = 0;
size_t len;
int errors = 0;
if (!filename)
{
return lt_dlopen (filename);
}
assert (filename);
len = LT_STRLEN (filename);
ext = strrchr (filename, '.');
/* If FILENAME already bears a suitable extension, there is no need
to try appending additional extensions. */
if (ext && ((strcmp (ext, archive_ext) == 0)
#ifdef LTDL_SHLIB_EXT
|| (strcmp (ext, shlib_ext) == 0)
#endif
))
{
return lt_dlopen (filename);
}
/* First try appending ARCHIVE_EXT. */
tmp = MALLOC (char, len + LT_STRLEN (archive_ext) + 1);
if (!tmp)
return 0;
strcpy (tmp, filename);
strcat (tmp, archive_ext);
errors = try_dlopen (&handle, tmp);
/* If we found FILENAME, stop searching -- whether we were able to
load the file as a module or not. If the file exists but loading
failed, it is better to return an error message here than to
report FILE_NOT_FOUND when the alternatives (foo.so etc) are not
in the module search path. */
if (handle || ((errors > 0) && !file_not_found ()))
{
FREE (tmp);
return handle;
}
#ifdef LTDL_SHLIB_EXT
/* Try appending SHLIB_EXT. */
if (LT_STRLEN (shlib_ext) > LT_STRLEN (archive_ext))
{
FREE (tmp);
tmp = MALLOC (char, len + LT_STRLEN (shlib_ext) + 1);
if (!tmp)
return 0;
strcpy (tmp, filename);
}
else
{
tmp[len] = LT_EOS_CHAR;
}
strcat(tmp, shlib_ext);
errors = try_dlopen (&handle, tmp);
/* As before, if the file was found but loading failed, return now
with the current error message. */
if (handle || ((errors > 0) && !file_not_found ()))
{
FREE (tmp);
return handle;
}
#endif
/* Still here? Then we really did fail to locate any of the file
names we tried. */
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (FILE_NOT_FOUND));
FREE (tmp);
return 0;
}
static int
lt_argz_insert (char **pargz, size_t *pargz_len, char *before,
const char *entry)
{
error_t error;
if ((error = argz_insert (pargz, pargz_len, before, entry)))
{
switch (error)
{
case ENOMEM:
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (NO_MEMORY));
break;
default:
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (UNKNOWN));
break;
}
return 1;
}
return 0;
}
static int
lt_argz_insertinorder (char **pargz, size_t *pargz_len, const char *entry)
{
char *before = 0;
assert (pargz);
assert (pargz_len);
assert (entry && *entry);
if (*pargz)
while ((before = argz_next (*pargz, *pargz_len, before)))
{
int cmp = strcmp (entry, before);
if (cmp < 0) break;
if (cmp == 0) return 0; /* No duplicates! */
}
return lt_argz_insert (pargz, pargz_len, before, entry);
}
static int
lt_argz_insertdir (char **pargz, size_t *pargz_len, const char *dirnam,
struct dirent *dp)
{
char *buf = 0;
size_t buf_len = 0;
char *end = 0;
size_t end_offset = 0;
size_t dir_len = 0;
int errors = 0;
assert (pargz);
assert (pargz_len);
assert (dp);
dir_len = LT_STRLEN (dirnam);
end = dp->d_name + D_NAMLEN(dp);
/* Ignore version numbers. */
{
char *p;
for (p = end; p -1 > dp->d_name; --p)
if (strchr (".0123456789", p[-1]) == 0)
break;
if (*p == '.')
end = p;
}
/* Ignore filename extension. */
{
char *p;
for (p = end -1; p > dp->d_name; --p)
if (*p == '.')
{
end = p;
break;
}
}
/* Prepend the directory name. */
end_offset = end - dp->d_name;
buf_len = dir_len + 1+ end_offset;
buf = MALLOC (char, 1+ buf_len);
if (!buf)
return ++errors;
assert (buf);
strcpy (buf, dirnam);
strcat (buf, "/");
strncat (buf, dp->d_name, end_offset);
buf[buf_len] = LT_EOS_CHAR;
/* Try to insert (in order) into ARGZ/ARGZ_LEN. */
if (lt_argz_insertinorder (pargz, pargz_len, buf) != 0)
++errors;
FREE (buf);
return errors;
}
static int
list_files_by_dir (const char *dirnam, char **pargz, size_t *pargz_len)
{
DIR *dirp = 0;
int errors = 0;
assert (dirnam && *dirnam);
assert (pargz);
assert (pargz_len);
assert (dirnam[LT_STRLEN(dirnam) -1] != '/');
dirp = opendir (dirnam);
if (dirp)
{
struct dirent *dp = 0;
while ((dp = readdir (dirp)))
if (dp->d_name[0] != '.')
if (lt_argz_insertdir (pargz, pargz_len, dirnam, dp))
{
++errors;
break;
}
closedir (dirp);
}
else
++errors;
return errors;
}
/* If there are any files in DIRNAME, call the function passed in
DATA1 (with the name of each file and DATA2 as arguments). */
static int
foreachfile_callback (char *dirname, void *data1, void *data2)
{
int (*func) (const char *filename, void *data)
= (int (*) (const char *filename, void *data)) data1;
int is_done = 0;
char *argz = 0;
size_t argz_len = 0;
if (list_files_by_dir (dirname, &argz, &argz_len) != 0)
goto cleanup;
if (!argz)
goto cleanup;
{
char *filename = 0;
while ((filename = argz_next (argz, argz_len, filename)))
if ((is_done = (*func) (filename, data2)))
break;
}
cleanup:
FREE (argz);
return is_done;
}
/* Call FUNC for each unique extensionless file in SEARCH_PATH, along
with DATA. The filenames passed to FUNC would be suitable for
passing to lt_dlopenext. The extensions are stripped so that
individual modules do not generate several entries (e.g. libfoo.la,
libfoo.so, libfoo.so.1, libfoo.so.1.0.0). If SEARCH_PATH is NULL,
then the same directories that lt_dlopen would search are examined. */
int
lt_dlforeachfile (const char *search_path,
int (*func) (const char *filename, void *data),
void *data)
{
int is_done = 0;
if (search_path)
{
/* If a specific path was passed, search only the directories
listed in it. */
is_done = foreach_dirinpath (search_path, 0,
foreachfile_callback, func, data);
}
else
{
/* Otherwise search the default paths. */
is_done = foreach_dirinpath (user_search_path, 0,
foreachfile_callback, func, data);
if (!is_done)
{
is_done = foreach_dirinpath (getenv("LTDL_LIBRARY_PATH"), 0,
foreachfile_callback, func, data);
}
#ifdef LTDL_SHLIBPATH_VAR
if (!is_done)
{
is_done = foreach_dirinpath (getenv(LTDL_SHLIBPATH_VAR), 0,
foreachfile_callback, func, data);
}
#endif
#ifdef LTDL_SYSSEARCHPATH
if (!is_done)
{
is_done = foreach_dirinpath (getenv(LTDL_SYSSEARCHPATH), 0,
foreachfile_callback, func, data);
}
#endif
}
return is_done;
}
int
lt_dlclose (lt_dlhandle handle)
{
lt_dlhandle cur, last;
int errors = 0;
LT_DLMUTEX_LOCK ();
/* check whether the handle is valid */
last = cur = handles;
while (cur && handle != cur)
{
last = cur;
cur = cur->next;
}
if (!cur)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_HANDLE));
++errors;
goto done;
}
handle->info.ref_count--;
/* Note that even with resident modules, we must track the ref_count
correctly incase the user decides to reset the residency flag
later (even though the API makes no provision for that at the
moment). */
if (handle->info.ref_count <= 0 && !LT_DLIS_RESIDENT (handle))
{
lt_user_data data = handle->loader->dlloader_data;
if (handle != handles)
{
last->next = handle->next;
}
else
{
handles = handle->next;
}
errors += handle->loader->module_close (data, handle->module);
errors += unload_deplibs(handle);
/* It is up to the callers to free the data itself. */
FREE (handle->caller_data);
FREE (handle->info.filename);
FREE (handle->info.name);
FREE (handle);
goto done;
}
if (LT_DLIS_RESIDENT (handle))
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (CLOSE_RESIDENT_MODULE));
++errors;
}
done:
LT_DLMUTEX_UNLOCK ();
return errors;
}
void *
lt_dlsym (lt_dlhandle handle, const char *symbol)
{
size_t lensym;
char lsym[LT_SYMBOL_LENGTH];
char *sym;
void *address;
lt_user_data data;
if (!handle)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_HANDLE));
return 0;
}
if (!symbol)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (SYMBOL_NOT_FOUND));
return 0;
}
lensym = LT_STRLEN (symbol) + LT_STRLEN (handle->loader->sym_prefix)
+ LT_STRLEN (handle->info.name);
if (lensym + LT_SYMBOL_OVERHEAD < LT_SYMBOL_LENGTH)
{
sym = lsym;
}
else
{
sym = MALLOC (char, lensym + LT_SYMBOL_OVERHEAD + 1);
if (!sym)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (BUFFER_OVERFLOW));
return 0;
}
}
data = handle->loader->dlloader_data;
if (handle->info.name)
{
const char *saved_error;
LT_DLMUTEX_GETERROR (saved_error);
/* this is a libtool module */
if (handle->loader->sym_prefix)
{
strcpy(sym, handle->loader->sym_prefix);
strcat(sym, handle->info.name);
}
else
{
strcpy(sym, handle->info.name);
}
strcat(sym, "_LTX_");
strcat(sym, symbol);
/* try "modulename_LTX_symbol" */
address = handle->loader->find_sym (data, handle->module, sym);
if (address)
{
if (sym != lsym)
{
FREE (sym);
}
return address;
}
LT_DLMUTEX_SETERROR (saved_error);
}
/* otherwise try "symbol" */
if (handle->loader->sym_prefix)
{
strcpy(sym, handle->loader->sym_prefix);
strcat(sym, symbol);
}
else
{
strcpy(sym, symbol);
}
address = handle->loader->find_sym (data, handle->module, sym);
if (sym != lsym)
{
FREE (sym);
}
return address;
}
const char *
lt_dlerror (void)
{
const char *error;
LT_DLMUTEX_GETERROR (error);
LT_DLMUTEX_SETERROR (0);
return error ? error : NULL;
}
static int
lt_dlpath_insertdir (char **ppath, char *before, const char *dir)
{
int errors = 0;
char *canonical = 0;
char *argz = 0;
size_t argz_len = 0;
assert (ppath);
assert (dir && *dir);
if (canonicalize_path (dir, &canonical) != 0)
{
++errors;
goto cleanup;
}
assert (canonical && *canonical);
/* If *PPATH is empty, set it to DIR. */
if (*ppath == 0)
{
assert (!before); /* BEFORE cannot be set without PPATH. */
assert (dir); /* Without DIR, don't call this function! */
*ppath = strdup (dir);
if (*ppath == 0)
++errors;
return errors;
}
assert (ppath && *ppath);
if (argzize_path (*ppath, &argz, &argz_len) != 0)
{
++errors;
goto cleanup;
}
/* Convert BEFORE into an equivalent offset into ARGZ. This only works
if *PPATH is already canonicalized, and hence does not change length
with respect to ARGZ. We canonicalize each entry as it is added to
the search path, and don't call this function with (uncanonicalized)
user paths, so this is a fair assumption. */
if (before)
{
assert (*ppath <= before);
assert (before - *ppath <= strlen (*ppath));
before = before - *ppath + argz;
}
if (lt_argz_insert (&argz, &argz_len, before, dir) != 0)
{
++errors;
goto cleanup;
}
argz_stringify (argz, argz_len, LT_PATHSEP_CHAR);
MEMREASSIGN(*ppath, argz);
cleanup:
FREE (argz);
FREE (canonical);
return errors;
}
int
lt_dladdsearchdir (const char *search_dir)
{
int errors = 0;
if (search_dir && *search_dir)
{
LT_DLMUTEX_LOCK ();
if (lt_dlpath_insertdir (&user_search_path, 0, search_dir) != 0)
++errors;
LT_DLMUTEX_UNLOCK ();
}
return errors;
}
int
lt_dlinsertsearchdir (const char *before, const char *search_dir)
{
int errors = 0;
if (before)
{
LT_DLMUTEX_LOCK ();
if ((before < user_search_path)
|| (before >= user_search_path + LT_STRLEN (user_search_path)))
{
LT_DLMUTEX_UNLOCK ();
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_POSITION));
return 1;
}
LT_DLMUTEX_UNLOCK ();
}
if (search_dir && *search_dir)
{
LT_DLMUTEX_LOCK ();
if (lt_dlpath_insertdir (&user_search_path,
(char *) before, search_dir) != 0)
{
++errors;
}
LT_DLMUTEX_UNLOCK ();
}
return errors;
}
int
lt_dlsetsearchpath (const char *search_path)
{
int errors = 0;
LT_DLMUTEX_LOCK ();
FREE (user_search_path);
LT_DLMUTEX_UNLOCK ();
if (!search_path || !LT_STRLEN (search_path))
{
return errors;
}
LT_DLMUTEX_LOCK ();
if (canonicalize_path (search_path, &user_search_path) != 0)
++errors;
LT_DLMUTEX_UNLOCK ();
return errors;
}
const char *
lt_dlgetsearchpath (void)
{
const char *saved_path;
LT_DLMUTEX_LOCK ();
saved_path = user_search_path;
LT_DLMUTEX_UNLOCK ();
return saved_path;
}
int
lt_dlmakeresident (lt_dlhandle handle)
{
int errors = 0;
if (!handle)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_HANDLE));
++errors;
}
else
{
LT_DLSET_FLAG (handle, LT_DLRESIDENT_FLAG);
}
return errors;
}
int
lt_dlisresident (lt_dlhandle handle)
{
if (!handle)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_HANDLE));
return -1;
}
return LT_DLIS_RESIDENT (handle);
}
/* --- MODULE INFORMATION --- */
const lt_dlinfo *
lt_dlgetinfo (lt_dlhandle handle)
{
if (!handle)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_HANDLE));
return 0;
}
return &(handle->info);
}
lt_dlhandle
lt_dlhandle_next (lt_dlhandle place)
{
return place ? place->next : handles;
}
lt_dlhandle
lt_dlhandle_find (const char *module_name)
{
lt_dlhandle cur = handles;
if (cur)
{
do
{
if (cur->info.name && strcmp (cur->info.name, module_name) == 0)
break;
}
while ((cur = cur->next));
}
return cur;
}
int
lt_dlforeach (int (*func) (lt_dlhandle handle, void *data), void *data)
{
int errors = 0;
lt_dlhandle cur;
LT_DLMUTEX_LOCK ();
cur = handles;
while (cur)
{
lt_dlhandle tmp = cur;
cur = cur->next;
if ((*func) (tmp, data))
{
++errors;
break;
}
}
LT_DLMUTEX_UNLOCK ();
return errors;
}
lt_dlcaller_id
lt_dlcaller_register (void)
{
static lt_dlcaller_id last_caller_id = 0;
int result;
LT_DLMUTEX_LOCK ();
result = ++last_caller_id;
LT_DLMUTEX_UNLOCK ();
return result;
}
void *
lt_dlcaller_set_data (lt_dlcaller_id key, lt_dlhandle handle, void *data)
{
int n_elements = 0;
void *stale = (void *) 0;
int i;
/* This needs to be locked so that the caller data can be updated
simultaneously by different threads. */
LT_DLMUTEX_LOCK ();
if (handle->caller_data)
while (handle->caller_data[n_elements].key)
++n_elements;
for (i = 0; i < n_elements; ++i)
{
if (handle->caller_data[i].key == key)
{
stale = handle->caller_data[i].data;
break;
}
}
/* Ensure that there is enough room in this handle's caller_data
array to accept a new element (and an empty end marker). */
if (i == n_elements)
{
lt_caller_data *temp
= REALLOC (lt_caller_data, handle->caller_data, 2+ n_elements);
if (!temp)
{
stale = 0;
goto done;
}
handle->caller_data = temp;
/* We only need this if we needed to allocate a new caller_data. */
handle->caller_data[i].key = key;
handle->caller_data[1+ i].key = 0;
}
handle->caller_data[i].data = data;
done:
LT_DLMUTEX_UNLOCK ();
return stale;
}
void *
lt_dlcaller_get_data (lt_dlcaller_id key, lt_dlhandle handle)
{
void *result = (void *) 0;
/* This needs to be locked so that the caller data isn't updated by
another thread part way through this function. */
LT_DLMUTEX_LOCK ();
/* Locate the index of the element with a matching KEY. */
{
int i;
for (i = 0; handle->caller_data[i].key; ++i)
{
if (handle->caller_data[i].key == key)
{
result = handle->caller_data[i].data;
break;
}
}
}
LT_DLMUTEX_UNLOCK ();
return result;
}
/* --- USER MODULE LOADER API --- */
int
lt_dlloader_add (lt_dlloader *place, const struct lt_user_dlloader *dlloader,
const char *loader_name)
{
int errors = 0;
lt_dlloader *node = 0, *ptr = 0;
if ((dlloader == 0) /* diagnose null parameters */
|| (dlloader->module_open == 0)
|| (dlloader->module_close == 0)
|| (dlloader->find_sym == 0))
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_LOADER));
return 1;
}
/* Create a new dlloader node with copies of the user callbacks. */
node = MALLOC (lt_dlloader, 1);
if (!node)
return 1;
node->next = 0;
node->loader_name = loader_name;
node->sym_prefix = dlloader->sym_prefix;
node->dlloader_exit = dlloader->dlloader_exit;
node->module_open = dlloader->module_open;
node->module_close = dlloader->module_close;
node->find_sym = dlloader->find_sym;
node->dlloader_data = dlloader->dlloader_data;
LT_DLMUTEX_LOCK ();
if (!loaders)
{
/* If there are no loaders, NODE becomes the list! */
loaders = node;
}
else if (!place)
{
/* If PLACE is not set, add NODE to the end of the
LOADERS list. */
for (ptr = loaders; ptr->next; ptr = ptr->next)
{
/*NOWORK*/;
}
ptr->next = node;
}
else if (loaders == place)
{
/* If PLACE is the first loader, NODE goes first. */
node->next = place;
loaders = node;
}
else
{
/* Find the node immediately preceding PLACE. */
for (ptr = loaders; ptr->next != place; ptr = ptr->next)
{
/*NOWORK*/;
}
if (ptr->next != place)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_LOADER));
++errors;
}
else
{
/* Insert NODE between PTR and PLACE. */
node->next = place;
ptr->next = node;
}
}
LT_DLMUTEX_UNLOCK ();
return errors;
}
int
lt_dlloader_remove (const char *loader_name)
{
lt_dlloader *place = lt_dlloader_find (loader_name);
lt_dlhandle handle;
int errors = 0;
if (!place)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_LOADER));
return 1;
}
LT_DLMUTEX_LOCK ();
/* Fail if there are any open modules which use this loader. */
for (handle = handles; handle; handle = handle->next)
{
if (handle->loader == place)
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (REMOVE_LOADER));
++errors;
goto done;
}
}
if (place == loaders)
{
/* PLACE is the first loader in the list. */
loaders = loaders->next;
}
else
{
/* Find the loader before the one being removed. */
lt_dlloader *prev;
for (prev = loaders; prev->next; prev = prev->next)
{
if (!strcmp (prev->next->loader_name, loader_name))
{
break;
}
}
place = prev->next;
prev->next = prev->next->next;
}
if (place->dlloader_exit)
{
errors = place->dlloader_exit (place->dlloader_data);
}
FREE (place);
done:
LT_DLMUTEX_UNLOCK ();
return errors;
}
lt_dlloader *
lt_dlloader_next (lt_dlloader *place)
{
lt_dlloader *next;
LT_DLMUTEX_LOCK ();
next = place ? place->next : loaders;
LT_DLMUTEX_UNLOCK ();
return next;
}
const char *
lt_dlloader_name (lt_dlloader *place)
{
const char *name = 0;
if (place)
{
LT_DLMUTEX_LOCK ();
name = place ? place->loader_name : 0;
LT_DLMUTEX_UNLOCK ();
}
else
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_LOADER));
}
return name;
}
lt_user_data *
lt_dlloader_data (lt_dlloader *place)
{
lt_user_data *data = 0;
if (place)
{
LT_DLMUTEX_LOCK ();
data = place ? &(place->dlloader_data) : 0;
LT_DLMUTEX_UNLOCK ();
}
else
{
LT_DLMUTEX_SETERROR (LT_DLSTRERROR (INVALID_LOADER));
}
return data;
}
lt_dlloader *
lt_dlloader_find (const char *loader_name)
{
lt_dlloader *place = 0;
LT_DLMUTEX_LOCK ();
for (place = loaders; place; place = place->next)
{
if (strcmp (place->loader_name, loader_name) == 0)
{
break;
}
}
LT_DLMUTEX_UNLOCK ();
return place;
}
/* These pointers are part of the published interface to libltdl,
although they are no longer used. */
LT_GLOBAL_DATA void *(*lt_dlmalloc) (size_t size) = 0;
LT_GLOBAL_DATA void *(*lt_dlrealloc) (void *ptr, size_t size) = 0;
LT_GLOBAL_DATA void (*lt_dlfree) (void *ptr) = 0;
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