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,
72 static void _g_module_close (gpointer handle,
74 static gpointer _g_module_self (void);
75 static gpointer _g_module_symbol (gpointer handle,
76 const gchar *symbol_name);
77 static gchar* _g_module_build_path (const gchar *directory,
78 const gchar *module_name);
79 static inline void g_module_set_error (const gchar *error);
80 static inline GModule* g_module_find_by_handle (gpointer handle);
81 static inline GModule* g_module_find_by_name (const gchar *name);
84 /* --- variables --- */
85 static GModule *modules = NULL;
86 static GModule *main_module = NULL;
87 static GStaticPrivate module_error_private = G_STATIC_PRIVATE_INIT;
90 /* --- inline functions --- */
91 static inline GModule*
92 g_module_find_by_handle (gpointer handle)
95 GModule *retval = NULL;
97 if (main_module && main_module->handle == handle)
100 for (module = modules; module; module = module->next)
101 if (handle == module->handle)
110 static inline GModule*
111 g_module_find_by_name (const gchar *name)
114 GModule *retval = NULL;
116 for (module = modules; module; module = module->next)
117 if (strcmp (name, module->file_name) == 0)
127 g_module_set_error_unduped (gchar *error)
129 g_static_private_set (&module_error_private, error, g_free);
134 g_module_set_error (const gchar *error)
136 g_module_set_error_unduped (g_strdup (error));
140 /* --- include platform specifc code --- */
141 #define SUPPORT_OR_RETURN(rv) { g_module_set_error (NULL); }
142 #if (G_MODULE_IMPL == G_MODULE_IMPL_DL)
143 #include "gmodule-dl.c"
144 #elif (G_MODULE_IMPL == G_MODULE_IMPL_DLD)
145 #include "gmodule-dld.c"
146 #elif (G_MODULE_IMPL == G_MODULE_IMPL_WIN32)
147 #include "gmodule-win32.c"
148 #elif (G_MODULE_IMPL == G_MODULE_IMPL_DYLD)
149 #include "gmodule-dyld.c"
151 #undef SUPPORT_OR_RETURN
152 #define SUPPORT_OR_RETURN(rv) { g_module_set_error ("dynamic modules are " \
153 "not supported by this system"); return rv; }
155 _g_module_open (const gchar *file_name,
161 _g_module_close (gpointer handle,
166 _g_module_self (void)
171 _g_module_symbol (gpointer handle,
172 const gchar *symbol_name)
177 _g_module_build_path (const gchar *directory,
178 const gchar *module_name)
182 #endif /* no implementation */
184 /* --- functions --- */
186 g_module_supported (void)
188 SUPPORT_OR_RETURN (FALSE);
194 parse_libtool_archive (const gchar* libtool_name)
196 const gint TOKEN_DLNAME = G_TOKEN_LAST + 1;
197 const gint TOKEN_INSTALLED = G_TOKEN_LAST + 2;
198 const gint TOKEN_LIBDIR = G_TOKEN_LAST + 3;
199 gchar *lt_dlname = NULL;
200 gboolean lt_installed = TRUE;
201 gchar *lt_libdir = NULL;
206 int fd = open (libtool_name, O_RDONLY, 0);
209 g_module_set_error_unduped (g_strdup_printf ("failed to open libtool archive \"%s\"", libtool_name));
212 /* search libtool's dlname specification */
213 scanner = g_scanner_new (NULL);
214 g_scanner_input_file (scanner, fd);
215 scanner->config->symbol_2_token = TRUE;
216 g_scanner_scope_add_symbol (scanner, 0, "dlname",
217 GUINT_TO_POINTER (TOKEN_DLNAME));
218 g_scanner_scope_add_symbol (scanner, 0, "installed",
219 GUINT_TO_POINTER (TOKEN_INSTALLED));
220 g_scanner_scope_add_symbol (scanner, 0, "libdir",
221 GUINT_TO_POINTER (TOKEN_LIBDIR));
222 while (!g_scanner_eof (scanner))
224 token = g_scanner_get_next_token (scanner);
225 if (token == TOKEN_DLNAME || token == TOKEN_INSTALLED ||
226 token == TOKEN_LIBDIR)
228 if (g_scanner_get_next_token (scanner) != '=' ||
229 g_scanner_get_next_token (scanner) !=
230 (token == TOKEN_INSTALLED ?
231 G_TOKEN_IDENTIFIER : G_TOKEN_STRING))
233 g_module_set_error_unduped (g_strdup_printf ("unable to parse libtool archive \"%s\"", libtool_name));
237 g_scanner_destroy (scanner);
244 if (token == TOKEN_DLNAME)
247 lt_dlname = g_strdup (scanner->value.v_string);
249 else if (token == TOKEN_INSTALLED)
251 strcmp (scanner->value.v_identifier, "yes") == 0;
252 else /* token == TOKEN_LIBDIR */
255 lt_libdir = g_strdup (scanner->value.v_string);
263 gchar *dir = g_path_get_dirname (libtool_name);
265 lt_libdir = g_strconcat (dir, G_DIR_SEPARATOR_S ".libs", NULL);
269 name = g_strconcat (lt_libdir, G_DIR_SEPARATOR_S, lt_dlname, NULL);
273 g_scanner_destroy (scanner);
279 static inline gboolean
280 str_check_suffix (const gchar* string,
283 gsize string_len = strlen (string);
284 gsize suffix_len = strlen (suffix);
286 return string_len >= suffix_len &&
287 strcmp (string + string_len - suffix_len, suffix) == 0;
290 static GStaticRecMutex g_module_global_lock = G_STATIC_REC_MUTEX_INIT;
293 g_module_open (const gchar *file_name,
297 gpointer handle = NULL;
300 SUPPORT_OR_RETURN (NULL);
302 g_static_rec_mutex_lock (&g_module_global_lock);
307 handle = _g_module_self ();
310 main_module = g_new (GModule, 1);
311 main_module->file_name = NULL;
312 main_module->handle = handle;
313 main_module->ref_count = 1;
314 main_module->is_resident = TRUE;
315 main_module->unload = NULL;
316 main_module->next = NULL;
320 main_module->ref_count++;
322 g_static_rec_mutex_unlock (&g_module_global_lock);
326 /* we first search the module list by name */
327 module = g_module_find_by_name (file_name);
332 g_static_rec_mutex_unlock (&g_module_global_lock);
336 /* check whether we have a readable file right away */
337 if (g_file_test (file_name, G_FILE_TEST_EXISTS | G_FILE_TEST_IS_REGULAR))
338 name = g_strdup (file_name);
339 /* try completing file name with standard library suffix */
342 name = g_strconcat (file_name, "." G_MODULE_SUFFIX, NULL);
343 if (!g_file_test (name, G_FILE_TEST_EXISTS | G_FILE_TEST_IS_REGULAR))
349 /* try completing by appending libtool suffix */
352 name = g_strconcat (file_name, ".la", NULL);
353 if (!g_file_test (name, G_FILE_TEST_EXISTS | G_FILE_TEST_IS_REGULAR))
359 /* we can't access() the file, lets hope the platform backends finds
360 * it via library paths
364 gchar *dot = strrchr (file_name, '.');
365 gchar *slash = strrchr (file_name, G_DIR_SEPARATOR);
367 /* make sure the name has a suffix */
368 if (!dot || dot < slash)
369 name = g_strconcat (file_name, "." G_MODULE_SUFFIX, NULL);
371 name = g_strdup (file_name);
374 /* ok, try loading the module */
377 /* if it's a libtool archive, figure library file to load */
378 if (str_check_suffix (name, ".la")) /* libtool archive? */
380 gchar *real_name = parse_libtool_archive (name);
382 /* real_name might be NULL, but then module error is already set */
387 handle = _g_module_open (name, (flags & G_MODULE_BIND_LAZY) != 0);
390 g_module_set_error_unduped (g_strdup_printf ("unable to access file \"%s\"", file_name));
396 GModuleCheckInit check_init;
397 const gchar *check_failed = NULL;
399 /* search the module list by handle, since file names are not unique */
400 module = g_module_find_by_handle (handle);
403 _g_module_close (module->handle, TRUE);
405 g_module_set_error (NULL);
407 g_static_rec_mutex_unlock (&g_module_global_lock);
411 saved_error = g_strdup (g_module_error ());
412 g_module_set_error (NULL);
414 module = g_new (GModule, 1);
415 module->file_name = g_strdup (file_name);
416 module->handle = handle;
417 module->ref_count = 1;
418 module->is_resident = FALSE;
419 module->unload = NULL;
420 module->next = modules;
423 /* check initialization */
424 if (g_module_symbol (module, "g_module_check_init", (gpointer) &check_init))
425 check_failed = check_init (module);
427 /* we don't call unload() if the initialization check failed. */
429 g_module_symbol (module, "g_module_unload", (gpointer) &module->unload);
435 error = g_strconcat ("GModule initialization check failed: ", check_failed, NULL);
436 g_module_close (module);
438 g_module_set_error (error);
442 g_module_set_error (saved_error);
444 g_free (saved_error);
447 g_static_rec_mutex_unlock (&g_module_global_lock);
452 g_module_close (GModule *module)
454 SUPPORT_OR_RETURN (FALSE);
456 g_return_val_if_fail (module != NULL, FALSE);
457 g_return_val_if_fail (module->ref_count > 0, FALSE);
459 g_static_rec_mutex_lock (&g_module_global_lock);
463 if (!module->ref_count && !module->is_resident && module->unload)
465 GModuleUnload unload;
467 unload = module->unload;
468 module->unload = NULL;
472 if (!module->ref_count && !module->is_resident)
485 last->next = node->next;
487 modules = node->next;
495 _g_module_close (module->handle, FALSE);
496 g_free (module->file_name);
501 g_static_rec_mutex_unlock (&g_module_global_lock);
502 return g_module_error() == NULL;
506 g_module_make_resident (GModule *module)
508 g_return_if_fail (module != NULL);
510 module->is_resident = TRUE;
513 G_CONST_RETURN gchar*
514 g_module_error (void)
516 return g_static_private_get (&module_error_private);
520 g_module_symbol (GModule *module,
521 const gchar *symbol_name,
524 const gchar *module_error;
528 SUPPORT_OR_RETURN (FALSE);
530 g_return_val_if_fail (module != NULL, FALSE);
531 g_return_val_if_fail (symbol_name != NULL, FALSE);
532 g_return_val_if_fail (symbol != NULL, FALSE);
534 g_static_rec_mutex_lock (&g_module_global_lock);
536 #ifdef G_MODULE_NEED_USCORE
540 name = g_strconcat ("_", symbol_name, NULL);
541 *symbol = _g_module_symbol (module->handle, name);
544 #else /* !G_MODULE_NEED_USCORE */
545 *symbol = _g_module_symbol (module->handle, symbol_name);
546 #endif /* !G_MODULE_NEED_USCORE */
548 module_error = g_module_error ();
553 error = g_strconcat ("`", symbol_name, "': ", module_error, NULL);
554 g_module_set_error (error);
559 g_static_rec_mutex_unlock (&g_module_global_lock);
560 return !module_error;
563 G_CONST_RETURN gchar*
564 g_module_name (GModule *module)
566 g_return_val_if_fail (module != NULL, NULL);
568 if (module == main_module)
571 return module->file_name;
575 g_module_build_path (const gchar *directory,
576 const gchar *module_name)
578 g_return_val_if_fail (module_name != NULL, NULL);
580 return _g_module_build_path (directory, module_name);