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/* ltdl.c -- system independent dlopen wrapper Copyright (C) 1998-2000, 2004-2008, 2011-2015 Free Software Foundation, Inc. Written by Thomas Tanner, 1998 NOTE: The canonical source of this file is maintained with the GNU Libtool package. Report bugs to bug-libtool@gnu.org. GNU Libltdl 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 this file under the same distribution terms that you use for the rest of that program. GNU Libltdl 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 GNU Libltdl; see the file COPYING.LIB. If not, a copy can be downloaded from http://www.gnu.org/licenses/lgpl.html, or obtained by writing to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. / #include "lt__private.h" #include "lt_system.h" #include "lt_dlloader.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 LT_ARCHIVE_EXT #define LT_ARCHIVE_EXT ".la" / max. filename length / #if !defined LT_FILENAME_MAX # define LT_FILENAME_MAX 1024 #endif #if !defined LT_LIBEXT # define LT_LIBEXT "a" #endif #if !defined LT_LIBPREFIX # define LT_LIBPREFIX "lib" #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 / Various boolean flags can be stored in the flags field of an lt_dlhandle... / #define LT_DLIS_RESIDENT(handle) ((handle)->info.is_resident) #define LT_DLIS_SYMGLOBAL(handle) ((handle)->info.is_symglobal) #define LT_DLIS_SYMLOCAL(handle) ((handle)->info.is_symlocal) static const char objdir[] = LT_OBJDIR; static const char archive_ext[] = LT_ARCHIVE_EXT; static const char libext[] = LT_LIBEXT; static const char libprefix[] = LT_LIBPREFIX; #if defined LT_MODULE_EXT static const char shlib_ext[] = LT_MODULE_EXT; #endif / If the loadable module suffix is not the same as the linkable * shared library suffix, this will be defined. / #if defined LT_SHARED_EXT static const char shared_ext[] = LT_SHARED_EXT; #endif #if defined LT_DLSEARCH_PATH static const char sys_dlsearch_path[] = LT_DLSEARCH_PATH; #endif / --- 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); /* foreachfile_callback itself calls a function of this type: / typedef int file_worker_func (const char filename, void data); 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 data1, void data2); 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, lt_dladvise advise); static int find_module (lt_dlhandle handle, const char dir, const char libdir, const char dlname, const char old_name, int installed, lt_dladvise advise); static int has_library_ext (const char filename); 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, const char ext, lt_dladvise advise); static int tryall_dlopen (lt_dlhandle handle, const char filename, lt_dladvise padvise, const lt_dlvtable vtable); 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); #ifdef HAVE_LIBDLLOADER static int loader_init_callback (lt_dlhandle handle); #endif /* HAVE_LIBDLLOADER / static int loader_init (lt_get_vtable vtable_func, lt_user_data data); static char user_search_path= 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__SETERROR (NO_MEMORY); } #ifdef HAVE_LIBDLLOADER / This function is called to initialise each preloaded module loader, and hook it into the list of loaders to be used when attempting to dlopen an application module. / static int loader_init_callback (lt_dlhandle handle) { lt_get_vtable vtable_func = (lt_get_vtable ) lt_dlsym (handle, "get_vtable"); return loader_init (vtable_func, 0); } #endif / HAVE_LIBDLLOADER / static int loader_init (lt_get_vtable vtable_func, lt_user_data data) { const lt_dlvtable vtable = 0; int errors = 0; if (vtable_func) { vtable = (vtable_func) (data); } /* lt_dlloader_add will LT__SETERROR if it fails. / errors += lt_dlloader_add (vtable); assert (errors \|\| vtable); if ((!errors) && vtable->dlloader_init) { if ((vtable->dlloader_init) (vtable->dlloader_data)) { LT__SETERROR (INIT_LOADER); ++errors; } } return errors; } /* Bootstrap the loader loading with the preopening loader. / #define get_vtable preopen_LTX_get_vtable #define preloaded_symbols LT_CONC3(lt_, LTDLOPEN, _LTX_preloaded_symbols) LT_BEGIN_C_DECLS LT_SCOPE const lt_dlvtable get_vtable (lt_user_data data); LT_END_C_DECLS #ifdef HAVE_LIBDLLOADER extern LT_DLSYM_CONST lt_dlsymlist preloaded_symbols[]; #endif /* Initialize libltdl. / int lt_dlinit (void) { int errors = 0; / Initialize only at first call. / if (++initialized == 1) { lt__alloc_die = lt__alloc_die_callback; handles = 0; user_search_path = 0; / empty search path / / First set up the statically loaded preload module loader, so we can use it to preopen the other loaders we linked in at compile time. / errors += loader_init (get_vtable, 0); / Now open all the preloaded module loaders, so the application can use _them_ to lt_dlopen its own modules. / #ifdef HAVE_LIBDLLOADER if (!errors) { errors += lt_dlpreload (preloaded_symbols); } if (!errors) { errors += lt_dlpreload_open (LT_STR(LTDLOPEN), loader_init_callback); } #endif / HAVE_LIBDLLOADER / } #ifdef LT_DEBUG_LOADERS lt_dlloader_dump(); #endif return errors; } int lt_dlexit (void) { / shut down libltdl / lt_dlloader loader = 0; lt_dlhandle handle = handles; int errors = 0; if (!initialized) { LT__SETERROR (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; handle; ++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 (tmp->info.ref_count <= level) { if (lt_dlclose (tmp)) { ++errors; } / Make sure that the handle pointed to by 'cur' still exists. lt_dlclose recursively closes dependent libraries, which removes them from the linked list. One of these might be the one pointed to by 'cur'. / if (cur) { for (tmp = handles; tmp; tmp = tmp->next) if (tmp == cur) break; if (! tmp) cur = handles; } } } } / done if only resident modules are left / if (!saw_nonresident) break; } / When removing loaders, we can only find out failure by testing the error string, so avoid a spurious one from an earlier failed command. / if (!errors) LT__SETERRORSTR (0); / close all loaders / for (loader = (lt_dlloader ) lt_dlloader_next (NULL); loader;) { lt_dlloader next = (lt_dlloader ) lt_dlloader_next (loader); lt_dlvtable vtable = (lt_dlvtable ) lt_dlloader_get (loader); if ((vtable = lt_dlloader_remove ((char ) vtable->name))) { FREE (vtable); } else { / ignore errors due to resident modules / const char err; LT__GETERROR (err); if (err) ++errors; } loader = next; } FREE(user_search_path); } done: return errors; } /* Try VTABLE or, if VTABLE is NULL, all available loaders for FILENAME. If the library is not successfully loaded, return non-zero. Otherwise, the dlhandle is stored at the address given in PHANDLE. / static int tryall_dlopen (lt_dlhandle phandle, const char filename, lt_dladvise advise, const lt_dlvtable vtable) { lt_dlhandle handle = handles; const char * saved_error = 0; int errors = 0; #ifdef LT_DEBUG_LOADERS fprintf (stderr, "tryall_dlopen (%s, %s)\n", filename ? filename : "(null)", vtable ? vtable->name : "(ALL)"); #endif LT__GETERROR (saved_error); /* check whether the module was already opened / for (;handle; handle = handle->next) { if ((handle->info.filename == filename) / dlopen self: 0 == 0 / \|\| (handle->info.filename && filename && STREQ (handle->info.filename, filename))) { break; } } if (handle) { ++handle->info.ref_count; phandle = handle; goto done; } handle = phandle; 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__SETERROR (FILE_NOT_FOUND); ++errors; goto done; } / handle->info.filename = lt__strdup (filename); if (!handle->info.filename) { ++errors; goto done; } } else { handle->info.filename = 0; } { lt_dlloader loader = lt_dlloader_next (0); const lt_dlvtable loader_vtable; do { if (vtable) loader_vtable = vtable; else loader_vtable = lt_dlloader_get (loader); #ifdef LT_DEBUG_LOADERS fprintf (stderr, "Calling %s->module_open (%s)\n", (loader_vtable && loader_vtable->name) ? loader_vtable->name : "(null)", filename ? filename : "(null)"); #endif handle->module = (loader_vtable->module_open) (loader_vtable->dlloader_data, filename, advise); #ifdef LT_DEBUG_LOADERS if (!handle->module) { char error; LT__GETERROR(error); fprintf (stderr, " Result: Failed\n" " Error message << %s >>\n", error ? error : "(null)"); } else { fprintf (stderr, " Result: Success\n"); } #endif if (handle->module != 0) { if (advise) { handle->info.is_resident = advise->is_resident; handle->info.is_symglobal = advise->is_symglobal; handle->info.is_symlocal = advise->is_symlocal; } break; } } while (!vtable && (loader = lt_dlloader_next (loader))); /* If VTABLE was given but couldn't open the module, or VTABLE wasn't given but we exhausted all loaders without opening the module, bail out! / if ((vtable && !handle->module) \|\| (!vtable && !loader)) { FREE (handle->info.filename); ++errors; goto done; } handle->vtable = loader_vtable; } LT__SETERRORSTR (saved_error); done: return errors; } static int tryall_dlopen_module (lt_dlhandle handle, const char prefix, const char dirname, const char dlname, lt_dladvise advise) { int error = 0; char filename = 0; size_t filename_len = 0; size_t dirname_len = LT_STRLEN (dirname); assert (handle); assert (dirname); assert (dlname); #if defined 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, 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, advise); } else if (tryall_dlopen (handle, filename, advise, 0) != 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, lt_dladvise advise) { / 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, advise, lt_dlloader_find ("lt_preopen") ) == 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, advise) == 0) return 0; } /* try to open the not-installed module / if (!installed) { if (tryall_dlopen_module (handle, dir, objdir, dlname, advise) == 0) return 0; } / maybe it was moved to another directory / { if (dir && (tryall_dlopen_module (handle, (const char ) 0, dir, dlname, advise) == 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] != '/') #if defined 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) #if defined 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__SETERROR (NO_MEMORY); break; default: LT__SETERROR (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; size_t filenamesize = 0; size_t lenbase = LT_STRLEN (base_name); size_t argz_len = 0; char argz = 0; char filename = 0; char canonical = 0; if (!search_path \|\| !search_path) { LT__SETERROR (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 (1+ lendir + lenbase >= filenamesize) { FREE (filename); filenamesize = 1+ lendir + 1+ lenbase; / "/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); 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 data2) { lt_dlhandle phandle = (lt_dlhandle ) data; int notfound = access (filename, R_OK); lt_dladvise advise = (lt_dladvise) data2; / 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 (phandle, filename, advise, 0) != 0) phandle = 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 phandle, lt_dladvise advise) { if (!search_path) return 0; if (!foreach_dirinpath (search_path, base_name, find_handle_callback, phandle, advise)) return 0; return phandle; } #if !defined LTDL_DLOPEN_DEPLIBS static int load_deplibs (lt_dlhandle handle, char deplibs LT__UNUSED) { handle->depcount = 0; return 0; } #else /* defined LTDL_DLOPEN_DEPLIBS / static int load_deplibs (lt_dlhandle handle, char deplibs) { char p, save_search_path = 0; int depcount = 0; int i; char *names = 0; int errors = 0; handle->depcount = 0; if (!deplibs) { return errors; } ++errors; 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 ((unsigned char) p)) { char end = p+1; while (end && !isspace((unsigned char) 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; } } 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 ((unsigned char) p)) { ++p; } else { char end = p+1; while (end && !isspace ((unsigned char) 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 = lt__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) { lt_dlhandle cur = handle; int j = 0; cur->deplibs = MALLOC (lt_dlhandle, depcount); if (!cur->deplibs) goto cleanup_names; for (i = 0; i < depcount; ++i) { cur->deplibs[j] = lt_dlopenext(names[depcount-1-i]); if (cur->deplibs[j]) { ++j; } } cur->depcount = j; / Number of successfully loaded deplibs / errors = 0; } cleanup_names: for (i = 0; i < depcount; ++i) { FREE (names[i]); } cleanup: FREE (names); / restore the old search path / if (save_search_path) { MEMREASSIGN (user_search_path, save_search_path); } return errors; } #endif / defined LTDL_DLOPEN_DEPLIBS / static int unload_deplibs (lt_dlhandle handle) { int i; int errors = 0; lt_dlhandle cur = handle; if (cur->depcount) { for (i = 0; i < cur->depcount; ++i) { if (!LT_DLIS_RESIDENT (cur->deplibs[i])) { errors += lt_dlclose (cur->deplibs[i]); } } FREE (cur->deplibs); } 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 (!end \|\| end == str) return 1; if (len > 3 && str[0] == '\'') { tmp = MALLOC (char, end - str); if (!tmp) return 1; memcpy(tmp, &str[1], (end - str) - 1); tmp[(end - str) - 1] = LT_EOS_CHAR; dest = tmp; } else { dest = 0; } return 0; } /* Read the .la file FILE. / static int parse_dotla_file(FILE file, char dlname, char libdir, char deplibs, char old_name, int installed) { int errors = 0; size_t line_len = LT_FILENAME_MAX; char line = MALLOC (char, line_len); if (!line) { LT__SETERROR (FILE_NOT_FOUND); return 1; } while (!feof (file)) { line[line_len-2] = '\0'; 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. Behave even if the file contains NUL bytes due to corruption. / while (line[line_len-2] != '\0' && line[line_len-2] != '\n' && !feof (file)) { line = REALLOC (char, line, line_len 2); if (!line) { ++errors; goto cleanup; } line[line_len * 2 - 2] = '\0'; 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]); } / Windows native tools do not understand the POSIX paths we store in libdir. / #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]); #ifdef __WINDOWS__ / Disallow following unix-style paths on MinGW. / if (libdir && (libdir == '/' \|\| libdir == '\\')) *libdir = '\0'; #endif } #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 (STREQ (line, "installed=yes\n")) { installed = 1; } else if (STREQ (line, "installed=no\n")) { 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 = lt__strdup (last_libname + 1); if (!last_libname) { ++errors; goto cleanup; } MEMREASSIGN (dlname, last_libname); } } if (errors) break; } cleanup: FREE (line); return errors; } /* Try to open FILENAME as a module. / static int try_dlopen (lt_dlhandle phandle, const char filename, const char ext, lt_dladvise advise) { const char * saved_error = 0; char * archive_name = 0; char * canonical = 0; char * base_name = 0; char * dir = 0; char * name = 0; char * attempt = 0; int errors = 0; lt_dlhandle newhandle; assert (phandle); assert (phandle == 0); #ifdef LT_DEBUG_LOADERS fprintf (stderr, "try_dlopen (%s, %s)\n", filename ? filename : "(null)", ext ? ext : "(null)"); #endif LT__GETERROR (saved_error); / dlopen self? / if (!filename) { phandle = (lt_dlhandle) lt__zalloc (sizeof (struct lt__handle)); if (phandle == 0) return 1; newhandle = phandle; /* lt_dlclose()ing yourself is very bad! Disallow it. / newhandle->info.is_resident = 1; if (tryall_dlopen (&newhandle, 0, advise, 0) != 0) { FREE (phandle); return 1; } goto register_handle; } assert (filename && filename); if (ext) { attempt = MALLOC (char, LT_STRLEN (filename) + LT_STRLEN (ext) + 1); if (!attempt) return 1; sprintf(attempt, "%s%s", filename, ext); } else { attempt = lt__strdup (filename); if (!attempt) return 1; } / Doing this immediately allows internal functions to safely assume only canonicalized paths are passed. / if (canonicalize_path (attempt, &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; } strlcpy (dir, canonical, dirlen); dir[dirlen] = LT_EOS_CHAR; ++base_name; } else MEMREASSIGN (base_name, canonical); assert (base_name && base_name); ext = strrchr (base_name, '.'); if (!ext) { ext = base_name + LT_STRLEN (base_name); } /* extract the module name from the file name / name = MALLOC (char, ext - base_name + 1); if (!name) { ++errors; goto cleanup; } / canonicalize the module name / { int i; for (i = 0; i < ext - base_name; ++i) { if (isalnum ((unsigned char)(base_name[i]))) { name[i] = base_name[i]; } else { name[i] = '_'; } } name[ext - base_name] = LT_EOS_CHAR; } / Before trawling through the file system in search of a module, check whether we are opening a preloaded module. / if (!dir) { const lt_dlvtable vtable = lt_dlloader_find ("lt_preopen"); if (vtable) { /* libprefix + name + "." + libext + NULL / archive_name = MALLOC (char, strlen (libprefix) + LT_STRLEN (name) + strlen (libext) + 2); phandle = (lt_dlhandle) lt__zalloc (sizeof (struct lt__handle)); if ((phandle == NULL) \|\| (archive_name == NULL)) { ++errors; goto cleanup; } newhandle = phandle; /* Preloaded modules are always named according to their old archive name. / if (strncmp(name, "lib", 3) == 0) { sprintf (archive_name, "%s%s.%s", libprefix, name + 3, libext); } else { sprintf (archive_name, "%s.%s", name, libext); } if (tryall_dlopen (&newhandle, archive_name, advise, vtable) == 0) { goto register_handle; } / If we're still here, there was no matching preloaded module, so put things back as we found them, and continue searching. / FREE (phandle); newhandle = NULL; } } /* If we are allowing only preloaded modules, and we didn't find anything yet, give up on the search here. / if (advise && advise->try_preload_only) { goto cleanup; } / Check whether we are opening a libtool module (.la extension). / if (ext && STREQ (ext, archive_ext)) { / this seems to be a libtool module / FILE file = 0; char * dlname = 0; char * old_name = 0; char * libdir = 0; char * deplibs = 0; /* 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; / 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 = user_search_path; if (search_path) file = find_file (user_search_path, base_name, &dir); if (!file) { search_path = getenv (LTDL_SEARCHPATH_VAR); if (search_path) file = find_file (search_path, base_name, &dir); } #if defined LT_MODULE_PATH_VAR if (!file) { search_path = getenv (LT_MODULE_PATH_VAR); if (search_path) file = find_file (search_path, base_name, &dir); } #endif #if defined LT_DLSEARCH_PATH if (!file && sys_dlsearch_path) { file = find_file (sys_dlsearch_path, base_name, &dir); } #endif } else { file = fopen (attempt, 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__SETERROR (FILE_NOT_FOUND); ++errors; goto cleanup; } / read the .la file / if (parse_dotla_file(file, &dlname, &libdir, &deplibs, &old_name, &installed) != 0) ++errors; fclose (file); / allocate the handle / phandle = (lt_dlhandle) lt__zalloc (sizeof (struct lt__handle)); if (phandle == 0) ++errors; if (errors) { FREE (dlname); FREE (old_name); FREE (libdir); FREE (deplibs); FREE (phandle); goto cleanup; } assert (phandle); if (load_deplibs (phandle, deplibs) == 0) { newhandle = phandle; / find_module may replace newhandle / if (find_module (&newhandle, dir, libdir, dlname, old_name, installed, advise)) { 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) lt__zalloc (sizeof (struct lt__handle)); if (phandle == 0) { ++errors; goto cleanup; } 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, advise) && !find_handle (getenv (LTDL_SEARCHPATH_VAR), base_name, &newhandle, advise) #if defined LT_MODULE_PATH_VAR && !find_handle (getenv (LT_MODULE_PATH_VAR), base_name, &newhandle, advise) #endif #if defined LT_DLSEARCH_PATH && !find_handle (sys_dlsearch_path, base_name, &newhandle, advise) #endif ))) { if (tryall_dlopen (&newhandle, attempt, advise, 0) != 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); (phandle)->next = handles; handles = phandle; } LT__SETERRORSTR (saved_error); cleanup: FREE (dir); FREE (attempt); FREE (name); if (!canonical) /* was MEMREASSIGNed / FREE (base_name); FREE (canonical); FREE (archive_name); return errors; } / If the last error message stored was 'FILE_NOT_FOUND', then return non-zero. / static int file_not_found (void) { const char error = 0; LT__GETERROR (error); if (error == LT__STRERROR (FILE_NOT_FOUND)) return 1; return 0; } /* Unless FILENAME already bears a suitable library extension, then return 0. / static int has_library_ext (const char filename) { const char * ext = 0; assert (filename); ext = strrchr (filename, '.'); if (ext && ((STREQ (ext, archive_ext)) #if defined LT_MODULE_EXT \|\| (STREQ (ext, shlib_ext)) #endif #if defined LT_SHARED_EXT \|\| (STREQ (ext, shared_ext)) #endif )) { return 1; } return 0; } /* Initialise and configure a user lt_dladvise opaque object. / int lt_dladvise_init (lt_dladvise padvise) { lt_dladvise advise = (lt_dladvise) lt__zalloc (sizeof (struct lt__advise)); padvise = advise; return (advise ? 0 : 1); } int lt_dladvise_destroy (lt_dladvise padvise) { if (padvise) FREE(padvise); return 0; } int lt_dladvise_ext (lt_dladvise padvise) { assert (padvise && padvise); (padvise)->try_ext = 1; return 0; } int lt_dladvise_resident (lt_dladvise padvise) { assert (padvise && padvise); (padvise)->is_resident = 1; return 0; } int lt_dladvise_local (lt_dladvise padvise) { assert (padvise && padvise); (padvise)->is_symlocal = 1; return 0; } int lt_dladvise_global (lt_dladvise padvise) { assert (padvise && padvise); (padvise)->is_symglobal = 1; return 0; } int lt_dladvise_preload (lt_dladvise padvise) { assert (padvise && padvise); (padvise)->try_preload_only = 1; return 0; } /* Libtool-1.5.x interface for loading a new module named FILENAME. / lt_dlhandle lt_dlopen (const char filename) { return lt_dlopenadvise (filename, NULL); } /* If FILENAME has an ARCHIVE_EXT or MODULE_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 MODULE_EXT appended instead. / lt_dlhandle lt_dlopenext (const char filename) { lt_dlhandle handle = 0; lt_dladvise advise; if (!lt_dladvise_init (&advise) && !lt_dladvise_ext (&advise)) handle = lt_dlopenadvise (filename, advise); lt_dladvise_destroy (&advise); return handle; } lt_dlhandle lt_dlopenadvise (const char filename, lt_dladvise advise) { lt_dlhandle handle = 0; int errors = 0; const char saved_error = 0; LT__GETERROR (saved_error); /* Can't have symbols hidden and visible at the same time! / if (advise && advise->is_symlocal && advise->is_symglobal) { LT__SETERROR (CONFLICTING_FLAGS); return 0; } if (!filename \|\| !advise \|\| !advise->try_ext \|\| has_library_ext (filename)) { / Just incase we missed a code path in try_dlopen() that reports an error, but forgot to reset handle... / if (try_dlopen (&handle, filename, NULL, advise) != 0) return 0; return handle; } else if (filename && filename) { /* First try appending ARCHIVE_EXT. / errors += try_dlopen (&handle, filename, archive_ext, advise); / 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 ())) return handle; #if defined LT_MODULE_EXT / Try appending SHLIB_EXT. / LT__SETERRORSTR (saved_error); errors = try_dlopen (&handle, filename, shlib_ext, advise); / As before, if the file was found but loading failed, return now with the current error message. / if (handle \|\| ((errors > 0) && !file_not_found ())) return handle; #endif #if defined LT_SHARED_EXT / Try appending SHARED_EXT. / LT__SETERRORSTR (saved_error); errors = try_dlopen (&handle, filename, shared_ext, advise); / As before, if the file was found but loading failed, return now with the current error message. / if (handle \|\| ((errors > 0) && !file_not_found ())) return handle; #endif } / Still here? Then we really did fail to locate any of the file names we tried. / LT__SETERROR (FILE_NOT_FOUND); return 0; } static int lt_argz_insert (char pargz, size_t pargz_len, char before, const char entry) { error_t error; /* Prior to Sep 8, 2005, newlib had a bug where argz_insert(pargz, pargz_len, NULL, entry) failed with EINVAL. / if (before) error = argz_insert (pargz, pargz_len, before, entry); else error = argz_append (pargz, pargz_len, entry, 1 + strlen (entry)); if (error) { switch (error) { case ENOMEM: LT__SETERROR (NO_MEMORY); break; default: LT__SETERROR (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) { file_worker_func func = (file_worker_func *) 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; file_worker_func *fpptr = &func; 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, fpptr, data); } else { / Otherwise search the default paths. / is_done = foreach_dirinpath (user_search_path, 0, foreachfile_callback, fpptr, data); if (!is_done) { is_done = foreach_dirinpath (getenv(LTDL_SEARCHPATH_VAR), 0, foreachfile_callback, fpptr, data); } #if defined LT_MODULE_PATH_VAR if (!is_done) { is_done = foreach_dirinpath (getenv(LT_MODULE_PATH_VAR), 0, foreachfile_callback, fpptr, data); } #endif #if defined LT_DLSEARCH_PATH if (!is_done && sys_dlsearch_path) { is_done = foreach_dirinpath (sys_dlsearch_path, 0, foreachfile_callback, fpptr, data); } #endif } return is_done; } int lt_dlclose (lt_dlhandle handle) { lt_dlhandle cur, last; int errors = 0; /* check whether the handle is valid / last = cur = handles; while (cur && handle != cur) { last = cur; cur = cur->next; } if (!cur) { LT__SETERROR (INVALID_HANDLE); ++errors; goto done; } cur = handle; cur->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 (cur->info.ref_count <= 0 && !LT_DLIS_RESIDENT (cur)) { lt_user_data data = cur->vtable->dlloader_data; if (cur != handles) { last->next = cur->next; } else { handles = cur->next; } errors += cur->vtable->module_close (data, cur->module); errors += unload_deplibs (handle); / It is up to the callers to free the data itself. / FREE (cur->interface_data); FREE (cur->info.filename); FREE (cur->info.name); FREE (cur); goto done; } if (LT_DLIS_RESIDENT (handle)) { LT__SETERROR (CLOSE_RESIDENT_MODULE); ++errors; } done: return errors; } void lt_dlsym (lt_dlhandle place, const char symbol) { size_t lensym; char lsym[LT_SYMBOL_LENGTH]; char sym; void address; lt_user_data data; lt_dlhandle handle; if (!place) { LT__SETERROR (INVALID_HANDLE); return 0; } handle = place; if (!symbol) { LT__SETERROR (SYMBOL_NOT_FOUND); return 0; } lensym = LT_STRLEN (symbol) + LT_STRLEN (handle->vtable->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__SETERROR (BUFFER_OVERFLOW); return 0; } } data = handle->vtable->dlloader_data; if (handle->info.name) { const char saved_error; LT__GETERROR (saved_error); /* this is a libtool module / if (handle->vtable->sym_prefix) { strcpy(sym, handle->vtable->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->vtable->find_sym (data, handle->module, sym); if (address) { if (sym != lsym) { FREE (sym); } return address; } LT__SETERRORSTR (saved_error); } / otherwise try "symbol" / if (handle->vtable->sym_prefix) { strcpy(sym, handle->vtable->sym_prefix); strcat(sym, symbol); } else { strcpy(sym, symbol); } address = handle->vtable->find_sym (data, handle->module, sym); if (sym != lsym) { FREE (sym); } return address; } const char lt_dlerror (void) { const char error; LT__GETERROR (error); LT__SETERRORSTR (0); return error; } 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 = lt__strdup (dir); if (ppath == 0) ++errors; goto cleanup; } 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 ((int) (before - ppath) <= (int) 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) { if (lt_dlpath_insertdir (&user_search_path, 0, search_dir) != 0) ++errors; } return errors; } int lt_dlinsertsearchdir (const char before, const char search_dir) { int errors = 0; if (before) { if ((before < user_search_path) \|\| (before >= user_search_path + LT_STRLEN (user_search_path))) { LT__SETERROR (INVALID_POSITION); return 1; } } if (search_dir && search_dir) { if (lt_dlpath_insertdir (&user_search_path, (char ) before, search_dir) != 0) { ++errors; } } return errors; } int lt_dlsetsearchpath (const char search_path) { int errors = 0; FREE (user_search_path); if (!search_path \|\| !LT_STRLEN (search_path)) { return errors; } if (canonicalize_path (search_path, &user_search_path) != 0) ++errors; return errors; } const char * lt_dlgetsearchpath (void) { const char saved_path; saved_path = user_search_path; return saved_path; } int lt_dlmakeresident (lt_dlhandle handle) { int errors = 0; if (!handle) { LT__SETERROR (INVALID_HANDLE); ++errors; } else { handle->info.is_resident = 1; } return errors; } int lt_dlisresident (lt_dlhandle handle) { if (!handle) { LT__SETERROR (INVALID_HANDLE); return -1; } return LT_DLIS_RESIDENT (handle); } / --- MODULE INFORMATION --- / typedef struct { char id_string; lt_dlhandle_interface iface; } lt__interface_id; lt_dlinterface_id lt_dlinterface_register (const char id_string, lt_dlhandle_interface iface) { lt__interface_id interface_id = (lt__interface_id ) lt__malloc (sizeof interface_id); /* If lt__malloc fails, it will LT__SETERROR (NO_MEMORY), which can then be detected with lt_dlerror() if we return 0. / if (interface_id) { interface_id->id_string = lt__strdup (id_string); if (!interface_id->id_string) FREE (interface_id); else interface_id->iface = iface; } return (lt_dlinterface_id) interface_id; } void lt_dlinterface_free (lt_dlinterface_id key) { lt__interface_id interface_id = (lt__interface_id )key; FREE (interface_id->id_string); FREE (interface_id); } void lt_dlcaller_set_data (lt_dlinterface_id key, lt_dlhandle handle, void data) { int n_elements = 0; void stale = (void ) 0; lt_dlhandle cur = handle; int i; if (cur->interface_data) while (cur->interface_data[n_elements].key) ++n_elements; for (i = 0; i < n_elements; ++i) { if (cur->interface_data[i].key == key) { stale = cur->interface_data[i].data; break; } } / Ensure that there is enough room in this handle's interface_data array to accept a new element (and an empty end marker). / if (i == n_elements) { lt_interface_data temp = REALLOC (lt_interface_data, cur->interface_data, 2+ n_elements); if (!temp) { stale = 0; goto done; } cur->interface_data = temp; /* We only need this if we needed to allocate a new interface_data. / cur->interface_data[i].key = key; cur->interface_data[1+ i].key = 0; } cur->interface_data[i].data = data; done: return stale; } void lt_dlcaller_get_data (lt_dlinterface_id key, lt_dlhandle handle) { void result = (void ) 0; lt_dlhandle cur = handle; /* Locate the index of the element with a matching KEY. / if (cur->interface_data) { int i; for (i = 0; cur->interface_data[i].key; ++i) { if (cur->interface_data[i].key == key) { result = cur->interface_data[i].data; break; } } } return result; } const lt_dlinfo lt_dlgetinfo (lt_dlhandle handle) { if (!handle) { LT__SETERROR (INVALID_HANDLE); return 0; } return &(handle->info); } lt_dlhandle lt_dlhandle_iterate (lt_dlinterface_id iface, lt_dlhandle place) { lt_dlhandle handle = place; lt__interface_id iterator = (lt__interface_id ) iface; assert (iface); /* iface is a required argument / if (!handle) handle = handles; else handle = handle->next; / advance while the interface check fails / while (handle && iterator->iface && ((iterator->iface) (handle, iterator->id_string) != 0)) { handle = handle->next; } return handle; } lt_dlhandle lt_dlhandle_fetch (lt_dlinterface_id iface, const char module_name) { lt_dlhandle handle = 0; assert (iface); / iface is a required argument / while ((handle = lt_dlhandle_iterate (iface, handle))) { lt_dlhandle cur = handle; if (cur && cur->info.name && STREQ (cur->info.name, module_name)) break; } return handle; } int lt_dlhandle_map (lt_dlinterface_id iface, int (func) (lt_dlhandle handle, void data), void data) { lt__interface_id iterator = (lt__interface_id ) iface; lt_dlhandle cur = handles; assert (iface); /* iface is a required argument / while (cur) { int errorcode = 0; / advance while the interface check fails / while (cur && iterator->iface && ((iterator->iface) (cur, iterator->id_string) != 0)) { cur = cur->next; } if ((errorcode = (*func) (cur, data)) != 0) return errorcode; } return 0; }

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