1 /* GMODULE - GLIB wrapper code for dynamic module loading
2 * Copyright (C) 1998 Tim Janik
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
21 * Modified by the GLib Team and others 1997-2000. See the AUTHORS
22 * file for a list of people on the GLib Team. See the ChangeLog
23 * files for a list of changes. These files are distributed with
24 * GLib at ftp://ftp.gtk.org/pub/gtk/.
35 #include "gmoduleconf.h"
38 #include <sys/types.h>
44 #if defined (G_OS_WIN32)
45 # include <io.h> /* For open() and close() prototypes. */
48 /* We maintain a list of modules, so we can reference count them.
49 * That's needed because some platforms don't support refernce counts on
50 * modules e.g. the shl_* implementation of HP-UX
51 * (http://www.stat.umn.edu/~luke/xls/projects/dlbasics/dlbasics.html).
52 * Also, the module for the program itself is kept seperatedly for
53 * faster access and because it has special semantics.
57 /* --- structures --- */
63 guint is_resident : 1;
69 /* --- prototypes --- */
70 static gpointer _g_module_open (const gchar *file_name,
73 static void _g_module_close (gpointer handle,
75 static gpointer _g_module_self (void);
76 static gpointer _g_module_symbol (gpointer handle,
77 const gchar *symbol_name);
78 static gchar* _g_module_build_path (const gchar *directory,
79 const gchar *module_name);
80 static inline void g_module_set_error (const gchar *error);
81 static inline GModule* g_module_find_by_handle (gpointer handle);
82 static inline GModule* g_module_find_by_name (const gchar *name);
85 /* --- variables --- */
86 static GModule *modules = NULL;
87 static GModule *main_module = NULL;
88 static GStaticPrivate module_error_private = G_STATIC_PRIVATE_INIT;
91 /* --- inline functions --- */
92 static inline GModule*
93 g_module_find_by_handle (gpointer handle)
96 GModule *retval = NULL;
98 if (main_module && main_module->handle == handle)
101 for (module = modules; module; module = module->next)
102 if (handle == module->handle)
111 static inline GModule*
112 g_module_find_by_name (const gchar *name)
115 GModule *retval = NULL;
117 for (module = modules; module; module = module->next)
118 if (strcmp (name, module->file_name) == 0)
128 g_module_set_error_unduped (gchar *error)
130 g_static_private_set (&module_error_private, error, g_free);
135 g_module_set_error (const gchar *error)
137 g_module_set_error_unduped (g_strdup (error));
141 /* --- include platform specifc code --- */
142 #define SUPPORT_OR_RETURN(rv) { g_module_set_error (NULL); }
143 #if (G_MODULE_IMPL == G_MODULE_IMPL_DL)
144 #include "gmodule-dl.c"
145 #elif (G_MODULE_IMPL == G_MODULE_IMPL_DLD)
146 #include "gmodule-dld.c"
147 #elif (G_MODULE_IMPL == G_MODULE_IMPL_WIN32)
148 #include "gmodule-win32.c"
149 #elif (G_MODULE_IMPL == G_MODULE_IMPL_DYLD)
150 #include "gmodule-dyld.c"
152 #undef SUPPORT_OR_RETURN
153 #define SUPPORT_OR_RETURN(rv) { g_module_set_error ("dynamic modules are " \
154 "not supported by this system"); return rv; }
156 _g_module_open (const gchar *file_name,
163 _g_module_close (gpointer handle,
168 _g_module_self (void)
173 _g_module_symbol (gpointer handle,
174 const gchar *symbol_name)
179 _g_module_build_path (const gchar *directory,
180 const gchar *module_name)
184 #endif /* no implementation */
186 /* --- functions --- */
188 g_module_supported (void)
190 SUPPORT_OR_RETURN (FALSE);
196 parse_libtool_archive (const gchar* libtool_name)
198 const gint TOKEN_DLNAME = G_TOKEN_LAST + 1;
199 const gint TOKEN_INSTALLED = G_TOKEN_LAST + 2;
200 const gint TOKEN_LIBDIR = G_TOKEN_LAST + 3;
201 gchar *lt_dlname = NULL;
202 gboolean lt_installed = TRUE;
203 gchar *lt_libdir = NULL;
208 int fd = open (libtool_name, O_RDONLY, 0);
211 g_module_set_error_unduped (g_strdup_printf ("failed to open libtool archive \"%s\"", libtool_name));
214 /* search libtool's dlname specification */
215 scanner = g_scanner_new (NULL);
216 g_scanner_input_file (scanner, fd);
217 scanner->config->symbol_2_token = TRUE;
218 g_scanner_scope_add_symbol (scanner, 0, "dlname",
219 GUINT_TO_POINTER (TOKEN_DLNAME));
220 g_scanner_scope_add_symbol (scanner, 0, "installed",
221 GUINT_TO_POINTER (TOKEN_INSTALLED));
222 g_scanner_scope_add_symbol (scanner, 0, "libdir",
223 GUINT_TO_POINTER (TOKEN_LIBDIR));
224 while (!g_scanner_eof (scanner))
226 token = g_scanner_get_next_token (scanner);
227 if (token == TOKEN_DLNAME || token == TOKEN_INSTALLED ||
228 token == TOKEN_LIBDIR)
230 if (g_scanner_get_next_token (scanner) != '=' ||
231 g_scanner_get_next_token (scanner) !=
232 (token == TOKEN_INSTALLED ?
233 G_TOKEN_IDENTIFIER : G_TOKEN_STRING))
235 g_module_set_error_unduped (g_strdup_printf ("unable to parse libtool archive \"%s\"", libtool_name));
239 g_scanner_destroy (scanner);
246 if (token == TOKEN_DLNAME)
249 lt_dlname = g_strdup (scanner->value.v_string);
251 else if (token == TOKEN_INSTALLED)
253 strcmp (scanner->value.v_identifier, "yes") == 0;
254 else /* token == TOKEN_LIBDIR */
257 lt_libdir = g_strdup (scanner->value.v_string);
265 gchar *dir = g_path_get_dirname (libtool_name);
267 lt_libdir = g_strconcat (dir, G_DIR_SEPARATOR_S ".libs", NULL);
271 name = g_strconcat (lt_libdir, G_DIR_SEPARATOR_S, lt_dlname, NULL);
275 g_scanner_destroy (scanner);
281 static inline gboolean
282 str_check_suffix (const gchar* string,
285 gsize string_len = strlen (string);
286 gsize suffix_len = strlen (suffix);
288 return string_len >= suffix_len &&
289 strcmp (string + string_len - suffix_len, suffix) == 0;
292 static GStaticRecMutex g_module_global_lock = G_STATIC_REC_MUTEX_INIT;
295 g_module_open (const gchar *file_name,
299 gpointer handle = NULL;
302 SUPPORT_OR_RETURN (NULL);
304 g_static_rec_mutex_lock (&g_module_global_lock);
309 handle = _g_module_self ();
312 main_module = g_new (GModule, 1);
313 main_module->file_name = NULL;
314 main_module->handle = handle;
315 main_module->ref_count = 1;
316 main_module->is_resident = TRUE;
317 main_module->unload = NULL;
318 main_module->next = NULL;
322 main_module->ref_count++;
324 g_static_rec_mutex_unlock (&g_module_global_lock);
328 /* we first search the module list by name */
329 module = g_module_find_by_name (file_name);
334 g_static_rec_mutex_unlock (&g_module_global_lock);
338 /* check whether we have a readable file right away */
339 if (g_file_test (file_name, G_FILE_TEST_EXISTS | G_FILE_TEST_IS_REGULAR))
340 name = g_strdup (file_name);
341 /* try completing file name with standard library suffix */
344 name = g_strconcat (file_name, "." G_MODULE_SUFFIX, NULL);
345 if (!g_file_test (name, G_FILE_TEST_EXISTS | G_FILE_TEST_IS_REGULAR))
351 /* try completing by appending libtool suffix */
354 name = g_strconcat (file_name, ".la", NULL);
355 if (!g_file_test (name, G_FILE_TEST_EXISTS | G_FILE_TEST_IS_REGULAR))
361 /* we can't access() the file, lets hope the platform backends finds
362 * it via library paths
366 gchar *dot = strrchr (file_name, '.');
367 gchar *slash = strrchr (file_name, G_DIR_SEPARATOR);
369 /* make sure the name has a suffix */
370 if (!dot || dot < slash)
371 name = g_strconcat (file_name, "." G_MODULE_SUFFIX, NULL);
373 name = g_strdup (file_name);
376 /* ok, try loading the module */
379 /* if it's a libtool archive, figure library file to load */
380 if (str_check_suffix (name, ".la")) /* libtool archive? */
382 gchar *real_name = parse_libtool_archive (name);
384 /* real_name might be NULL, but then module error is already set */
389 handle = _g_module_open (name, (flags & G_MODULE_BIND_LAZY) != 0,
390 (flags & G_MODULE_BIND_LOCAL) != 0);
393 g_module_set_error_unduped (g_strdup_printf ("unable to access file \"%s\"", file_name));
399 GModuleCheckInit check_init;
400 const gchar *check_failed = NULL;
402 /* search the module list by handle, since file names are not unique */
403 module = g_module_find_by_handle (handle);
406 _g_module_close (module->handle, TRUE);
408 g_module_set_error (NULL);
410 g_static_rec_mutex_unlock (&g_module_global_lock);
414 saved_error = g_strdup (g_module_error ());
415 g_module_set_error (NULL);
417 module = g_new (GModule, 1);
418 module->file_name = g_strdup (file_name);
419 module->handle = handle;
420 module->ref_count = 1;
421 module->is_resident = FALSE;
422 module->unload = NULL;
423 module->next = modules;
426 /* check initialization */
427 if (g_module_symbol (module, "g_module_check_init", (gpointer) &check_init))
428 check_failed = check_init (module);
430 /* we don't call unload() if the initialization check failed. */
432 g_module_symbol (module, "g_module_unload", (gpointer) &module->unload);
438 error = g_strconcat ("GModule initialization check failed: ", check_failed, NULL);
439 g_module_close (module);
441 g_module_set_error (error);
445 g_module_set_error (saved_error);
447 g_free (saved_error);
450 g_static_rec_mutex_unlock (&g_module_global_lock);
455 g_module_close (GModule *module)
457 SUPPORT_OR_RETURN (FALSE);
459 g_return_val_if_fail (module != NULL, FALSE);
460 g_return_val_if_fail (module->ref_count > 0, FALSE);
462 g_static_rec_mutex_lock (&g_module_global_lock);
466 if (!module->ref_count && !module->is_resident && module->unload)
468 GModuleUnload unload;
470 unload = module->unload;
471 module->unload = NULL;
475 if (!module->ref_count && !module->is_resident)
488 last->next = node->next;
490 modules = node->next;
498 _g_module_close (module->handle, FALSE);
499 g_free (module->file_name);
504 g_static_rec_mutex_unlock (&g_module_global_lock);
505 return g_module_error() == NULL;
509 g_module_make_resident (GModule *module)
511 g_return_if_fail (module != NULL);
513 module->is_resident = TRUE;
516 G_CONST_RETURN gchar*
517 g_module_error (void)
519 return g_static_private_get (&module_error_private);
523 g_module_symbol (GModule *module,
524 const gchar *symbol_name,
527 const gchar *module_error;
531 SUPPORT_OR_RETURN (FALSE);
533 g_return_val_if_fail (module != NULL, FALSE);
534 g_return_val_if_fail (symbol_name != NULL, FALSE);
535 g_return_val_if_fail (symbol != NULL, FALSE);
537 g_static_rec_mutex_lock (&g_module_global_lock);
539 #ifdef G_MODULE_NEED_USCORE
543 name = g_strconcat ("_", symbol_name, NULL);
544 *symbol = _g_module_symbol (module->handle, name);
547 #else /* !G_MODULE_NEED_USCORE */
548 *symbol = _g_module_symbol (module->handle, symbol_name);
549 #endif /* !G_MODULE_NEED_USCORE */
551 module_error = g_module_error ();
556 error = g_strconcat ("`", symbol_name, "': ", module_error, NULL);
557 g_module_set_error (error);
562 g_static_rec_mutex_unlock (&g_module_global_lock);
563 return !module_error;
566 G_CONST_RETURN gchar*
567 g_module_name (GModule *module)
569 g_return_val_if_fail (module != NULL, NULL);
571 if (module == main_module)
574 return module->file_name;
578 g_module_build_path (const gchar *directory,
579 const gchar *module_name)
581 g_return_val_if_fail (module_name != NULL, NULL);
583 return _g_module_build_path (directory, module_name);