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>
45 /* We maintain a list of modules, so we can reference count them.
46 * That's needed because some platforms don't support refernce counts on
47 * modules e.g. the shl_* implementation of HP-UX
48 * (http://www.stat.umn.edu/~luke/xls/projects/dlbasics/dlbasics.html).
49 * Also, the module for the program itself is kept seperatedly for
50 * faster access and because it has special semantics.
54 /* --- structures --- */
60 guint is_resident : 1;
66 /* --- prototypes --- */
67 static gpointer _g_module_open (const gchar *file_name,
69 static void _g_module_close (gpointer handle,
71 static gpointer _g_module_self (void);
72 static gpointer _g_module_symbol (gpointer handle,
73 const gchar *symbol_name);
74 static gchar* _g_module_build_path (const gchar *directory,
75 const gchar *module_name);
76 static inline void g_module_set_error (const gchar *error);
77 static inline GModule* g_module_find_by_handle (gpointer handle);
78 static inline GModule* g_module_find_by_name (const gchar *name);
81 /* --- variables --- */
82 const char *g_log_domain_gmodule = "GModule";
83 static GModule *modules = NULL;
84 static GModule *main_module = NULL;
85 static GStaticPrivate module_error_private = G_STATIC_PRIVATE_INIT;
88 /* --- inline functions --- */
89 static inline GModule*
90 g_module_find_by_handle (gpointer handle)
93 GModule *retval = NULL;
95 if (main_module && main_module->handle == handle)
98 for (module = modules; module; module = module->next)
99 if (handle == module->handle)
108 static inline GModule*
109 g_module_find_by_name (const gchar *name)
112 GModule *retval = NULL;
114 for (module = modules; module; module = module->next)
115 if (strcmp (name, module->file_name) == 0)
125 g_module_set_error (const gchar *error)
127 g_static_private_set (&module_error_private, g_strdup (error), g_free);
132 /* --- include platform specifc code --- */
133 #define SUPPORT_OR_RETURN(rv) { g_module_set_error (NULL); }
134 #if (G_MODULE_IMPL == G_MODULE_IMPL_DL)
135 #include "gmodule-dl.c"
136 #elif (G_MODULE_IMPL == G_MODULE_IMPL_DLD)
137 #include "gmodule-dld.c"
138 #elif (G_MODULE_IMPL == G_MODULE_IMPL_WIN32)
139 #include "gmodule-win32.c"
141 #undef SUPPORT_OR_RETURN
142 #define SUPPORT_OR_RETURN(rv) { g_module_set_error ("dynamic modules are " \
143 "not supported by this system"); return rv; }
145 _g_module_open (const gchar *file_name,
151 _g_module_close (gpointer handle,
156 _g_module_self (void)
161 _g_module_symbol (gpointer handle,
162 const gchar *symbol_name)
167 _g_module_build_path (const gchar *directory,
168 const gchar *module_name)
172 #endif /* no implementation */
174 /* --- functions --- */
176 g_module_supported (void)
178 SUPPORT_OR_RETURN (FALSE);
184 parse_libtool_archive (const gchar* libtool_name)
186 const gint TOKEN_DLNAME = G_TOKEN_LAST + 1;
187 const gint TOKEN_INSTALLED = G_TOKEN_LAST + 2;
188 const gint TOKEN_LIBDIR = G_TOKEN_LAST + 3;
189 gchar *lt_dlname = NULL;
190 gboolean lt_installed = TRUE;
191 gchar *lt_libdir = NULL;
196 int fd = open (libtool_name, O_RDONLY, 0);
199 g_module_set_error ("couldn't open libtool archive");
202 /* search libtool's dlname specification */
203 scanner = g_scanner_new (NULL);
204 g_scanner_input_file (scanner, fd);
205 scanner->config->symbol_2_token = TRUE;
206 g_scanner_scope_add_symbol (scanner, 0, "dlname",
207 GUINT_TO_POINTER (TOKEN_DLNAME));
208 g_scanner_scope_add_symbol (scanner, 0, "installed",
209 GUINT_TO_POINTER (TOKEN_INSTALLED));
210 g_scanner_scope_add_symbol (scanner, 0, "libdir",
211 GUINT_TO_POINTER (TOKEN_LIBDIR));
212 while (!g_scanner_eof (scanner))
214 token = g_scanner_get_next_token (scanner);
215 if (token == TOKEN_DLNAME || token == TOKEN_INSTALLED ||
216 token == TOKEN_LIBDIR)
218 if (g_scanner_get_next_token (scanner) != '=' ||
219 g_scanner_get_next_token (scanner) !=
220 (token == TOKEN_INSTALLED ?
221 G_TOKEN_IDENTIFIER : G_TOKEN_STRING))
223 g_module_set_error ("libtool archive has unknown format");
227 g_scanner_destroy (scanner);
234 if (token == TOKEN_DLNAME)
237 lt_dlname = g_strdup (scanner->value.v_string);
239 else if (token == TOKEN_INSTALLED)
241 strcmp (scanner->value.v_identifier, "yes") == 0;
242 else /* token == TOKEN_LIBDIR */
245 lt_libdir = g_strdup (scanner->value.v_string);
253 gchar *dir = g_path_get_dirname (libtool_name);
255 lt_libdir = g_strconcat (dir, G_DIR_SEPARATOR_S ".libs", NULL);
258 name = g_module_build_path (lt_libdir, lt_dlname);
262 g_scanner_destroy (scanner);
268 static inline gboolean
269 g_str_check_suffix (const gchar* string, const gchar* suffix)
271 guint string_len = strlen (string);
272 guint suffix_len = strlen (suffix);
274 return string_len >= suffix_len &&
275 strcmp (string + string_len - suffix_len, suffix) == 0;
278 static GStaticRecMutex g_module_global_lock = G_STATIC_REC_MUTEX_INIT;
281 g_module_open (const gchar *file_name,
287 SUPPORT_OR_RETURN (NULL);
289 g_static_rec_mutex_lock (&g_module_global_lock);
294 handle = _g_module_self ();
297 main_module = g_new (GModule, 1);
298 main_module->file_name = NULL;
299 main_module->handle = handle;
300 main_module->ref_count = 1;
301 main_module->is_resident = TRUE;
302 main_module->unload = NULL;
303 main_module->next = NULL;
307 g_static_rec_mutex_unlock (&g_module_global_lock);
311 /* we first search the module list by name */
312 module = g_module_find_by_name (file_name);
317 g_static_rec_mutex_unlock (&g_module_global_lock);
321 /* First we try to open the module as provided */
322 handle = _g_module_open (file_name, (flags & G_MODULE_BIND_LAZY) != 0);
324 /* If not found, we check, if it is a libtool archive */
325 if (!handle && g_str_check_suffix (file_name, ".la"))
327 gchar *name = parse_libtool_archive (file_name);
330 handle = _g_module_open (name, (flags & G_MODULE_BIND_LAZY) != 0);
335 /* If still not found, we check, if it is a library name without suffix */
336 if (!handle && !g_str_check_suffix (file_name, "." G_MODULE_SUFFIX))
338 gchar *name = g_strconcat (file_name, "." G_MODULE_SUFFIX, NULL);
339 handle = _g_module_open (name, (flags & G_MODULE_BIND_LAZY) != 0);
343 /* If still not found, we check, if it is a libtool archive name
345 if (!handle && !g_str_check_suffix (file_name, ".la"))
347 gchar *la_name = g_strconcat (file_name, ".la", NULL);
348 gchar *name = parse_libtool_archive (la_name);
351 handle = _g_module_open (name, (flags & G_MODULE_BIND_LAZY) != 0);
360 GModuleCheckInit check_init;
361 const gchar *check_failed = NULL;
363 /* search the module list by handle, since file names are not unique */
364 module = g_module_find_by_handle (handle);
367 _g_module_close (module->handle, TRUE);
369 g_module_set_error (NULL);
371 g_static_rec_mutex_unlock (&g_module_global_lock);
375 saved_error = g_strdup (g_module_error ());
376 g_module_set_error (NULL);
378 module = g_new (GModule, 1);
379 module->file_name = g_strdup (file_name);
380 module->handle = handle;
381 module->ref_count = 1;
382 module->is_resident = FALSE;
383 module->unload = NULL;
384 module->next = modules;
387 /* check initialization */
388 if (g_module_symbol (module, "g_module_check_init", (gpointer) &check_init))
389 check_failed = check_init (module);
391 /* we don't call unload() if the initialization check failed. */
393 g_module_symbol (module, "g_module_unload", (gpointer) &module->unload);
399 error = g_strconcat ("GModule initialization check failed: ", check_failed, NULL);
400 g_module_close (module);
402 g_module_set_error (error);
406 g_module_set_error (saved_error);
408 g_free (saved_error);
411 g_static_rec_mutex_unlock (&g_module_global_lock);
416 g_module_close (GModule *module)
418 SUPPORT_OR_RETURN (FALSE);
420 g_return_val_if_fail (module != NULL, FALSE);
421 g_return_val_if_fail (module->ref_count > 0, FALSE);
423 g_static_rec_mutex_lock (&g_module_global_lock);
427 if (!module->ref_count && !module->is_resident && module->unload)
429 GModuleUnload unload;
431 unload = module->unload;
432 module->unload = NULL;
436 if (!module->ref_count && !module->is_resident)
449 last->next = node->next;
451 modules = node->next;
459 _g_module_close (module->handle, FALSE);
460 g_free (module->file_name);
465 g_static_rec_mutex_unlock (&g_module_global_lock);
466 return g_module_error() == NULL;
470 g_module_make_resident (GModule *module)
472 g_return_if_fail (module != NULL);
474 module->is_resident = TRUE;
478 g_module_error (void)
480 return g_static_private_get (&module_error_private);
484 g_module_symbol (GModule *module,
485 const gchar *symbol_name,
492 SUPPORT_OR_RETURN (FALSE);
494 g_return_val_if_fail (module != NULL, FALSE);
495 g_return_val_if_fail (symbol_name != NULL, FALSE);
496 g_return_val_if_fail (symbol != NULL, FALSE);
498 g_static_rec_mutex_lock (&g_module_global_lock);
500 #ifdef G_MODULE_NEED_USCORE
504 name = g_strconcat ("_", symbol_name, NULL);
505 *symbol = _g_module_symbol (module->handle, name);
508 #else /* !G_MODULE_NEED_USCORE */
509 *symbol = _g_module_symbol (module->handle, symbol_name);
510 #endif /* !G_MODULE_NEED_USCORE */
512 module_error = g_module_error ();
517 error = g_strconcat ("`", symbol_name, "': ", module_error, NULL);
518 g_module_set_error (error);
523 g_static_rec_mutex_unlock (&g_module_global_lock);
524 return !module_error;
528 g_module_name (GModule *module)
530 g_return_val_if_fail (module != NULL, NULL);
532 if (module == main_module)
535 return module->file_name;
539 g_module_build_path (const gchar *directory,
540 const gchar *module_name)
542 g_return_val_if_fail (module_name != NULL, NULL);
544 return _g_module_build_path (directory, module_name);