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/.
36 #include "gmoduleconf.h"
39 #include <sys/types.h>
45 #if defined (G_OS_WIN32)
46 # include <io.h> /* For open() and close() prototypes. */
49 /* We maintain a list of modules, so we can reference count them.
50 * That's needed because some platforms don't support refernce counts on
51 * modules e.g. the shl_* implementation of HP-UX
52 * (http://www.stat.umn.edu/~luke/xls/projects/dlbasics/dlbasics.html).
53 * Also, the module for the program itself is kept seperatedly for
54 * faster access and because it has special semantics.
58 /* --- structures --- */
64 guint is_resident : 1;
70 /* --- prototypes --- */
71 static gpointer _g_module_open (const gchar *file_name,
74 static void _g_module_close (gpointer handle,
76 static gpointer _g_module_self (void);
77 static gpointer _g_module_symbol (gpointer handle,
78 const gchar *symbol_name);
79 static gchar* _g_module_build_path (const gchar *directory,
80 const gchar *module_name);
81 static inline void g_module_set_error (const gchar *error);
82 static inline GModule* g_module_find_by_handle (gpointer handle);
83 static inline GModule* g_module_find_by_name (const gchar *name);
86 /* --- variables --- */
87 static GModule *modules = NULL;
88 static GModule *main_module = NULL;
89 static GStaticPrivate module_error_private = G_STATIC_PRIVATE_INIT;
92 /* --- inline functions --- */
93 static inline GModule*
94 g_module_find_by_handle (gpointer handle)
97 GModule *retval = NULL;
99 if (main_module && main_module->handle == handle)
100 retval = main_module;
102 for (module = modules; module; module = module->next)
103 if (handle == module->handle)
112 static inline GModule*
113 g_module_find_by_name (const gchar *name)
116 GModule *retval = NULL;
118 for (module = modules; module; module = module->next)
119 if (strcmp (name, module->file_name) == 0)
129 g_module_set_error_unduped (gchar *error)
131 g_static_private_set (&module_error_private, error, g_free);
136 g_module_set_error (const gchar *error)
138 g_module_set_error_unduped (g_strdup (error));
142 /* --- include platform specifc code --- */
143 #define SUPPORT_OR_RETURN(rv) { g_module_set_error (NULL); }
144 #if (G_MODULE_IMPL == G_MODULE_IMPL_DL)
145 #include "gmodule-dl.c"
146 #elif (G_MODULE_IMPL == G_MODULE_IMPL_DLD)
147 #include "gmodule-dld.c"
148 #elif (G_MODULE_IMPL == G_MODULE_IMPL_WIN32)
149 #include "gmodule-win32.c"
150 #elif (G_MODULE_IMPL == G_MODULE_IMPL_DYLD)
151 #include "gmodule-dyld.c"
152 #elif (G_MODULE_IMPL == G_MODULE_IMPL_AR)
153 #include "gmodule-ar.c"
155 #undef SUPPORT_OR_RETURN
156 #define SUPPORT_OR_RETURN(rv) { g_module_set_error ("dynamic modules are " \
157 "not supported by this system"); return rv; }
159 _g_module_open (const gchar *file_name,
166 _g_module_close (gpointer handle,
171 _g_module_self (void)
176 _g_module_symbol (gpointer handle,
177 const gchar *symbol_name)
182 _g_module_build_path (const gchar *directory,
183 const gchar *module_name)
187 #endif /* no implementation */
189 /* --- functions --- */
191 g_module_supported (void)
193 SUPPORT_OR_RETURN (FALSE);
199 parse_libtool_archive (const gchar* libtool_name)
201 const gint TOKEN_DLNAME = G_TOKEN_LAST + 1;
202 const gint TOKEN_INSTALLED = G_TOKEN_LAST + 2;
203 const gint TOKEN_LIBDIR = G_TOKEN_LAST + 3;
204 gchar *lt_dlname = NULL;
205 gboolean lt_installed = TRUE;
206 gchar *lt_libdir = NULL;
211 int fd = g_open (libtool_name, O_RDONLY, 0);
214 gchar *display_libtool_name = g_filename_display_name (libtool_name);
215 g_module_set_error_unduped (g_strdup_printf ("failed to open libtool archive \"%s\"", display_libtool_name));
216 g_free (display_libtool_name);
219 /* search libtool's dlname specification */
220 scanner = g_scanner_new (NULL);
221 g_scanner_input_file (scanner, fd);
222 scanner->config->symbol_2_token = TRUE;
223 g_scanner_scope_add_symbol (scanner, 0, "dlname",
224 GUINT_TO_POINTER (TOKEN_DLNAME));
225 g_scanner_scope_add_symbol (scanner, 0, "installed",
226 GUINT_TO_POINTER (TOKEN_INSTALLED));
227 g_scanner_scope_add_symbol (scanner, 0, "libdir",
228 GUINT_TO_POINTER (TOKEN_LIBDIR));
229 while (!g_scanner_eof (scanner))
231 token = g_scanner_get_next_token (scanner);
232 if (token == TOKEN_DLNAME || token == TOKEN_INSTALLED ||
233 token == TOKEN_LIBDIR)
235 if (g_scanner_get_next_token (scanner) != '=' ||
236 g_scanner_get_next_token (scanner) !=
237 (token == TOKEN_INSTALLED ?
238 G_TOKEN_IDENTIFIER : G_TOKEN_STRING))
240 gchar *display_libtool_name = g_filename_display_name (libtool_name);
241 g_module_set_error_unduped (g_strdup_printf ("unable to parse libtool archive \"%s\"", display_libtool_name));
242 g_free (display_libtool_name);
246 g_scanner_destroy (scanner);
253 if (token == TOKEN_DLNAME)
256 lt_dlname = g_strdup (scanner->value.v_string);
258 else if (token == TOKEN_INSTALLED)
260 strcmp (scanner->value.v_identifier, "yes") == 0;
261 else /* token == TOKEN_LIBDIR */
264 lt_libdir = g_strdup (scanner->value.v_string);
272 gchar *dir = g_path_get_dirname (libtool_name);
274 lt_libdir = g_strconcat (dir, G_DIR_SEPARATOR_S ".libs", NULL);
278 name = g_strconcat (lt_libdir, G_DIR_SEPARATOR_S, lt_dlname, NULL);
282 g_scanner_destroy (scanner);
288 static inline gboolean
289 str_check_suffix (const gchar* string,
292 gsize string_len = strlen (string);
293 gsize suffix_len = strlen (suffix);
295 return string_len >= suffix_len &&
296 strcmp (string + string_len - suffix_len, suffix) == 0;
299 static GStaticRecMutex g_module_global_lock = G_STATIC_REC_MUTEX_INIT;
302 g_module_open (const gchar *file_name,
306 gpointer handle = NULL;
309 SUPPORT_OR_RETURN (NULL);
311 g_static_rec_mutex_lock (&g_module_global_lock);
316 handle = _g_module_self ();
319 main_module = g_new (GModule, 1);
320 main_module->file_name = NULL;
321 main_module->handle = handle;
322 main_module->ref_count = 1;
323 main_module->is_resident = TRUE;
324 main_module->unload = NULL;
325 main_module->next = NULL;
329 main_module->ref_count++;
331 g_static_rec_mutex_unlock (&g_module_global_lock);
335 /* we first search the module list by name */
336 module = g_module_find_by_name (file_name);
341 g_static_rec_mutex_unlock (&g_module_global_lock);
345 /* check whether we have a readable file right away */
346 if (g_file_test (file_name, G_FILE_TEST_EXISTS | G_FILE_TEST_IS_REGULAR))
347 name = g_strdup (file_name);
348 /* try completing file name with standard library suffix */
351 name = g_strconcat (file_name, "." G_MODULE_SUFFIX, NULL);
352 if (!g_file_test (name, G_FILE_TEST_EXISTS | G_FILE_TEST_IS_REGULAR))
358 /* try completing by appending libtool suffix */
361 name = g_strconcat (file_name, ".la", NULL);
362 if (!g_file_test (name, G_FILE_TEST_EXISTS | G_FILE_TEST_IS_REGULAR))
368 /* we can't access() the file, lets hope the platform backends finds
369 * it via library paths
373 gchar *dot = strrchr (file_name, '.');
374 gchar *slash = strrchr (file_name, G_DIR_SEPARATOR);
376 /* make sure the name has a suffix */
377 if (!dot || dot < slash)
378 name = g_strconcat (file_name, "." G_MODULE_SUFFIX, NULL);
380 name = g_strdup (file_name);
383 /* ok, try loading the module */
386 /* if it's a libtool archive, figure library file to load */
387 if (str_check_suffix (name, ".la")) /* libtool archive? */
389 gchar *real_name = parse_libtool_archive (name);
391 /* real_name might be NULL, but then module error is already set */
396 handle = _g_module_open (name, (flags & G_MODULE_BIND_LAZY) != 0,
397 (flags & G_MODULE_BIND_LOCAL) != 0);
401 gchar *display_file_name = g_filename_display_name (file_name);
402 g_module_set_error_unduped (g_strdup_printf ("unable to access file \"%s\"", display_file_name));
403 g_free (display_file_name);
410 GModuleCheckInit check_init;
411 const gchar *check_failed = NULL;
413 /* search the module list by handle, since file names are not unique */
414 module = g_module_find_by_handle (handle);
417 _g_module_close (module->handle, TRUE);
419 g_module_set_error (NULL);
421 g_static_rec_mutex_unlock (&g_module_global_lock);
425 saved_error = g_strdup (g_module_error ());
426 g_module_set_error (NULL);
428 module = g_new (GModule, 1);
429 module->file_name = g_strdup (file_name);
430 module->handle = handle;
431 module->ref_count = 1;
432 module->is_resident = FALSE;
433 module->unload = NULL;
434 module->next = modules;
437 /* check initialization */
438 if (g_module_symbol (module, "g_module_check_init", (gpointer) &check_init))
439 check_failed = check_init (module);
441 /* we don't call unload() if the initialization check failed. */
443 g_module_symbol (module, "g_module_unload", (gpointer) &module->unload);
449 error = g_strconcat ("GModule initialization check failed: ", check_failed, NULL);
450 g_module_close (module);
452 g_module_set_error (error);
456 g_module_set_error (saved_error);
458 g_free (saved_error);
461 g_static_rec_mutex_unlock (&g_module_global_lock);
466 g_module_close (GModule *module)
468 SUPPORT_OR_RETURN (FALSE);
470 g_return_val_if_fail (module != NULL, FALSE);
471 g_return_val_if_fail (module->ref_count > 0, FALSE);
473 g_static_rec_mutex_lock (&g_module_global_lock);
477 if (!module->ref_count && !module->is_resident && module->unload)
479 GModuleUnload unload;
481 unload = module->unload;
482 module->unload = NULL;
486 if (!module->ref_count && !module->is_resident)
499 last->next = node->next;
501 modules = node->next;
509 _g_module_close (module->handle, FALSE);
510 g_free (module->file_name);
515 g_static_rec_mutex_unlock (&g_module_global_lock);
516 return g_module_error() == NULL;
520 g_module_make_resident (GModule *module)
522 g_return_if_fail (module != NULL);
524 module->is_resident = TRUE;
527 G_CONST_RETURN gchar*
528 g_module_error (void)
530 return g_static_private_get (&module_error_private);
534 g_module_symbol (GModule *module,
535 const gchar *symbol_name,
538 const gchar *module_error;
542 SUPPORT_OR_RETURN (FALSE);
544 g_return_val_if_fail (module != NULL, FALSE);
545 g_return_val_if_fail (symbol_name != NULL, FALSE);
546 g_return_val_if_fail (symbol != NULL, FALSE);
548 g_static_rec_mutex_lock (&g_module_global_lock);
550 #ifdef G_MODULE_NEED_USCORE
554 name = g_strconcat ("_", symbol_name, NULL);
555 *symbol = _g_module_symbol (module->handle, name);
558 #else /* !G_MODULE_NEED_USCORE */
559 *symbol = _g_module_symbol (module->handle, symbol_name);
560 #endif /* !G_MODULE_NEED_USCORE */
562 module_error = g_module_error ();
567 error = g_strconcat ("`", symbol_name, "': ", module_error, NULL);
568 g_module_set_error (error);
573 g_static_rec_mutex_unlock (&g_module_global_lock);
574 return !module_error;
577 G_CONST_RETURN gchar*
578 g_module_name (GModule *module)
580 g_return_val_if_fail (module != NULL, NULL);
582 if (module == main_module)
585 return module->file_name;
589 g_module_build_path (const gchar *directory,
590 const gchar *module_name)
592 g_return_val_if_fail (module_name != NULL, NULL);
594 return _g_module_build_path (directory, module_name);