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"
151 #elif (G_MODULE_IMPL == G_MODULE_IMPL_AR)
152 #include "gmodule-ar.c"
154 #undef SUPPORT_OR_RETURN
155 #define SUPPORT_OR_RETURN(rv) { g_module_set_error ("dynamic modules are " \
156 "not supported by this system"); return rv; }
158 _g_module_open (const gchar *file_name,
165 _g_module_close (gpointer handle,
170 _g_module_self (void)
175 _g_module_symbol (gpointer handle,
176 const gchar *symbol_name)
181 _g_module_build_path (const gchar *directory,
182 const gchar *module_name)
186 #endif /* no implementation */
188 /* --- functions --- */
190 g_module_supported (void)
192 SUPPORT_OR_RETURN (FALSE);
198 parse_libtool_archive (const gchar* libtool_name)
200 const gint TOKEN_DLNAME = G_TOKEN_LAST + 1;
201 const gint TOKEN_INSTALLED = G_TOKEN_LAST + 2;
202 const gint TOKEN_LIBDIR = G_TOKEN_LAST + 3;
203 gchar *lt_dlname = NULL;
204 gboolean lt_installed = TRUE;
205 gchar *lt_libdir = NULL;
210 int fd = open (libtool_name, O_RDONLY, 0);
213 g_module_set_error_unduped (g_strdup_printf ("failed to open libtool archive \"%s\"", libtool_name));
216 /* search libtool's dlname specification */
217 scanner = g_scanner_new (NULL);
218 g_scanner_input_file (scanner, fd);
219 scanner->config->symbol_2_token = TRUE;
220 g_scanner_scope_add_symbol (scanner, 0, "dlname",
221 GUINT_TO_POINTER (TOKEN_DLNAME));
222 g_scanner_scope_add_symbol (scanner, 0, "installed",
223 GUINT_TO_POINTER (TOKEN_INSTALLED));
224 g_scanner_scope_add_symbol (scanner, 0, "libdir",
225 GUINT_TO_POINTER (TOKEN_LIBDIR));
226 while (!g_scanner_eof (scanner))
228 token = g_scanner_get_next_token (scanner);
229 if (token == TOKEN_DLNAME || token == TOKEN_INSTALLED ||
230 token == TOKEN_LIBDIR)
232 if (g_scanner_get_next_token (scanner) != '=' ||
233 g_scanner_get_next_token (scanner) !=
234 (token == TOKEN_INSTALLED ?
235 G_TOKEN_IDENTIFIER : G_TOKEN_STRING))
237 g_module_set_error_unduped (g_strdup_printf ("unable to parse libtool archive \"%s\"", libtool_name));
241 g_scanner_destroy (scanner);
248 if (token == TOKEN_DLNAME)
251 lt_dlname = g_strdup (scanner->value.v_string);
253 else if (token == TOKEN_INSTALLED)
255 strcmp (scanner->value.v_identifier, "yes") == 0;
256 else /* token == TOKEN_LIBDIR */
259 lt_libdir = g_strdup (scanner->value.v_string);
267 gchar *dir = g_path_get_dirname (libtool_name);
269 lt_libdir = g_strconcat (dir, G_DIR_SEPARATOR_S ".libs", NULL);
273 name = g_strconcat (lt_libdir, G_DIR_SEPARATOR_S, lt_dlname, NULL);
277 g_scanner_destroy (scanner);
283 static inline gboolean
284 str_check_suffix (const gchar* string,
287 gsize string_len = strlen (string);
288 gsize suffix_len = strlen (suffix);
290 return string_len >= suffix_len &&
291 strcmp (string + string_len - suffix_len, suffix) == 0;
294 static GStaticRecMutex g_module_global_lock = G_STATIC_REC_MUTEX_INIT;
297 g_module_open (const gchar *file_name,
301 gpointer handle = NULL;
304 SUPPORT_OR_RETURN (NULL);
306 g_static_rec_mutex_lock (&g_module_global_lock);
311 handle = _g_module_self ();
314 main_module = g_new (GModule, 1);
315 main_module->file_name = NULL;
316 main_module->handle = handle;
317 main_module->ref_count = 1;
318 main_module->is_resident = TRUE;
319 main_module->unload = NULL;
320 main_module->next = NULL;
324 main_module->ref_count++;
326 g_static_rec_mutex_unlock (&g_module_global_lock);
330 /* we first search the module list by name */
331 module = g_module_find_by_name (file_name);
336 g_static_rec_mutex_unlock (&g_module_global_lock);
340 /* check whether we have a readable file right away */
341 if (g_file_test (file_name, G_FILE_TEST_EXISTS | G_FILE_TEST_IS_REGULAR))
342 name = g_strdup (file_name);
343 /* try completing file name with standard library suffix */
346 name = g_strconcat (file_name, "." G_MODULE_SUFFIX, NULL);
347 if (!g_file_test (name, G_FILE_TEST_EXISTS | G_FILE_TEST_IS_REGULAR))
353 /* try completing by appending libtool suffix */
356 name = g_strconcat (file_name, ".la", NULL);
357 if (!g_file_test (name, G_FILE_TEST_EXISTS | G_FILE_TEST_IS_REGULAR))
363 /* we can't access() the file, lets hope the platform backends finds
364 * it via library paths
368 gchar *dot = strrchr (file_name, '.');
369 gchar *slash = strrchr (file_name, G_DIR_SEPARATOR);
371 /* make sure the name has a suffix */
372 if (!dot || dot < slash)
373 name = g_strconcat (file_name, "." G_MODULE_SUFFIX, NULL);
375 name = g_strdup (file_name);
378 /* ok, try loading the module */
381 /* if it's a libtool archive, figure library file to load */
382 if (str_check_suffix (name, ".la")) /* libtool archive? */
384 gchar *real_name = parse_libtool_archive (name);
386 /* real_name might be NULL, but then module error is already set */
391 handle = _g_module_open (name, (flags & G_MODULE_BIND_LAZY) != 0,
392 (flags & G_MODULE_BIND_LOCAL) != 0);
395 g_module_set_error_unduped (g_strdup_printf ("unable to access file \"%s\"", file_name));
401 GModuleCheckInit check_init;
402 const gchar *check_failed = NULL;
404 /* search the module list by handle, since file names are not unique */
405 module = g_module_find_by_handle (handle);
408 _g_module_close (module->handle, TRUE);
410 g_module_set_error (NULL);
412 g_static_rec_mutex_unlock (&g_module_global_lock);
416 saved_error = g_strdup (g_module_error ());
417 g_module_set_error (NULL);
419 module = g_new (GModule, 1);
420 module->file_name = g_strdup (file_name);
421 module->handle = handle;
422 module->ref_count = 1;
423 module->is_resident = FALSE;
424 module->unload = NULL;
425 module->next = modules;
428 /* check initialization */
429 if (g_module_symbol (module, "g_module_check_init", (gpointer) &check_init))
430 check_failed = check_init (module);
432 /* we don't call unload() if the initialization check failed. */
434 g_module_symbol (module, "g_module_unload", (gpointer) &module->unload);
440 error = g_strconcat ("GModule initialization check failed: ", check_failed, NULL);
441 g_module_close (module);
443 g_module_set_error (error);
447 g_module_set_error (saved_error);
449 g_free (saved_error);
452 g_static_rec_mutex_unlock (&g_module_global_lock);
457 g_module_close (GModule *module)
459 SUPPORT_OR_RETURN (FALSE);
461 g_return_val_if_fail (module != NULL, FALSE);
462 g_return_val_if_fail (module->ref_count > 0, FALSE);
464 g_static_rec_mutex_lock (&g_module_global_lock);
468 if (!module->ref_count && !module->is_resident && module->unload)
470 GModuleUnload unload;
472 unload = module->unload;
473 module->unload = NULL;
477 if (!module->ref_count && !module->is_resident)
490 last->next = node->next;
492 modules = node->next;
500 _g_module_close (module->handle, FALSE);
501 g_free (module->file_name);
506 g_static_rec_mutex_unlock (&g_module_global_lock);
507 return g_module_error() == NULL;
511 g_module_make_resident (GModule *module)
513 g_return_if_fail (module != NULL);
515 module->is_resident = TRUE;
518 G_CONST_RETURN gchar*
519 g_module_error (void)
521 return g_static_private_get (&module_error_private);
525 g_module_symbol (GModule *module,
526 const gchar *symbol_name,
529 const gchar *module_error;
533 SUPPORT_OR_RETURN (FALSE);
535 g_return_val_if_fail (module != NULL, FALSE);
536 g_return_val_if_fail (symbol_name != NULL, FALSE);
537 g_return_val_if_fail (symbol != NULL, FALSE);
539 g_static_rec_mutex_lock (&g_module_global_lock);
541 #ifdef G_MODULE_NEED_USCORE
545 name = g_strconcat ("_", symbol_name, NULL);
546 *symbol = _g_module_symbol (module->handle, name);
549 #else /* !G_MODULE_NEED_USCORE */
550 *symbol = _g_module_symbol (module->handle, symbol_name);
551 #endif /* !G_MODULE_NEED_USCORE */
553 module_error = g_module_error ();
558 error = g_strconcat ("`", symbol_name, "': ", module_error, NULL);
559 g_module_set_error (error);
564 g_static_rec_mutex_unlock (&g_module_global_lock);
565 return !module_error;
568 G_CONST_RETURN gchar*
569 g_module_name (GModule *module)
571 g_return_val_if_fail (module != NULL, NULL);
573 if (module == main_module)
576 return module->file_name;
580 g_module_build_path (const gchar *directory,
581 const gchar *module_name)
583 g_return_val_if_fail (module_name != NULL, NULL);
585 return _g_module_build_path (directory, module_name);