1 /* GIO - GLib Input, Output and Streaming Library
3 * Copyright (C) 2006-2007 Red Hat, Inc.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General
16 * Public License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
18 * Boston, MA 02111-1307, USA.
20 * Author: Alexander Larsson <alexl@redhat.com>
27 #include "giomodule.h"
28 #include "giomodule-priv.h"
29 #include "glocalfilemonitor.h"
30 #include "glocaldirectorymonitor.h"
31 #include "gnativevolumemonitor.h"
32 #include "gproxyresolver.h"
34 #include "gsettingsbackendinternal.h"
35 #include "gsocks4proxy.h"
36 #include "gsocks4aproxy.h"
37 #include "gsocks5proxy.h"
38 #include "gtlsbackend.h"
40 #include "gnotificationbackend.h"
42 #include "gregistrysettingsbackend.h"
44 #include <glib/gstdio.h>
47 #include "gdesktopappinfo.h"
52 * @short_description: Loadable GIO Modules
55 * Provides an interface and default functions for loading and unloading
56 * modules. This is used internally to make GIO extensible, but can also
57 * be used by others to implement module loading.
62 * SECTION:extensionpoints
63 * @short_description: Extension Points
65 * @see_also: <link linkend="extending-gio">Extending GIO</link>
67 * #GIOExtensionPoint provides a mechanism for modules to extend the
68 * functionality of the library or application that loaded it in an
71 * An extension point is identified by a name, and it may optionally
72 * require that any implementation must be of a certain type (or derived
73 * thereof). Use g_io_extension_point_register() to register an
74 * extension point, and g_io_extension_point_set_required_type() to
75 * set a required type.
77 * A module can implement an extension point by specifying the #GType
78 * that implements the functionality. Additionally, each implementation
79 * of an extension point has a name, and a priority. Use
80 * g_io_extension_point_implement() to implement an extension point.
83 * GIOExtensionPoint *ep;
85 * /* Register an extension point */
86 * ep = g_io_extension_point_register ("my-extension-point");
87 * g_io_extension_point_set_required_type (ep, MY_TYPE_EXAMPLE);
91 * /* Implement an extension point */
92 * G_DEFINE_TYPE (MyExampleImpl, my_example_impl, MY_TYPE_EXAMPLE);
93 * g_io_extension_point_implement ("my-extension-point",
94 * my_example_impl_get_type (),
99 * It is up to the code that registered the extension point how
100 * it uses the implementations that have been associated with it.
101 * Depending on the use case, it may use all implementations, or
102 * only the one with the highest priority, or pick a specific
105 * To avoid opening all modules just to find out what extension
106 * points they implement, GIO makes use of a caching mechanism,
107 * see <link linkend="gio-querymodules">gio-querymodules</link>.
108 * You are expected to run this command after installing a
111 * The <envar>GIO_EXTRA_MODULES</envar> environment variable can be
112 * used to specify additional directories to automatically load modules
113 * from. This environment variable has the same syntax as the
114 * <envar>PATH</envar>. If two modules have the same base name in different
115 * directories, then the latter one will be ignored. If additional
116 * directories are specified GIO will load modules from the built-in
123 * Represents a scope for loading IO modules. A scope can be used for blocking
124 * duplicate modules, or blocking a module you don't want to load.
126 * The scope can be used with g_io_modules_load_all_in_directory_with_scope()
127 * or g_io_modules_scan_all_in_directory_with_scope().
131 struct _GIOModuleScope {
132 GIOModuleScopeFlags flags;
133 GHashTable *basenames;
137 * g_io_module_scope_new:
138 * @flags: flags for the new scope
140 * Create a new scope for loading of IO modules. A scope can be used for
141 * blocking duplicate modules, or blocking a module you don't want to load.
143 * Specify the %G_IO_MODULE_SCOPE_BLOCK_DUPLICATES flag to block modules
144 * which have the same base name as a module that has already been seen
147 * Returns: (transfer full): the new module scope
152 g_io_module_scope_new (GIOModuleScopeFlags flags)
154 GIOModuleScope *scope = g_new0 (GIOModuleScope, 1);
155 scope->flags = flags;
156 scope->basenames = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
161 * g_io_module_scope_free:
162 * @scope: a module loading scope
164 * Free a module scope.
169 g_io_module_scope_free (GIOModuleScope *scope)
173 g_hash_table_destroy (scope->basenames);
178 * g_io_module_scope_block:
179 * @scope: a module loading scope
180 * @basename: the basename to block
182 * Block modules with the given @basename from being loaded when
183 * this scope is used with g_io_modules_scan_all_in_directory_with_scope()
184 * or g_io_modules_load_all_in_directory_with_scope().
189 g_io_module_scope_block (GIOModuleScope *scope,
190 const gchar *basename)
194 g_return_if_fail (scope != NULL);
195 g_return_if_fail (basename != NULL);
197 key = g_strdup (basename);
198 g_hash_table_insert (scope->basenames, key, key);
202 _g_io_module_scope_contains (GIOModuleScope *scope,
203 const gchar *basename)
205 return g_hash_table_lookup (scope->basenames, basename) ? TRUE : FALSE;
209 GTypeModule parent_instance;
213 gboolean initialized; /* The module was loaded at least once */
215 void (* load) (GIOModule *module);
216 void (* unload) (GIOModule *module);
219 struct _GIOModuleClass
221 GTypeModuleClass parent_class;
225 static void g_io_module_finalize (GObject *object);
226 static gboolean g_io_module_load_module (GTypeModule *gmodule);
227 static void g_io_module_unload_module (GTypeModule *gmodule);
229 struct _GIOExtension {
235 struct _GIOExtensionPoint {
239 GList *lazy_load_modules;
242 static GHashTable *extension_points = NULL;
243 G_LOCK_DEFINE_STATIC(extension_points);
245 G_DEFINE_TYPE (GIOModule, g_io_module, G_TYPE_TYPE_MODULE);
248 g_io_module_class_init (GIOModuleClass *class)
250 GObjectClass *object_class = G_OBJECT_CLASS (class);
251 GTypeModuleClass *type_module_class = G_TYPE_MODULE_CLASS (class);
253 object_class->finalize = g_io_module_finalize;
255 type_module_class->load = g_io_module_load_module;
256 type_module_class->unload = g_io_module_unload_module;
260 g_io_module_init (GIOModule *module)
265 g_io_module_finalize (GObject *object)
267 GIOModule *module = G_IO_MODULE (object);
269 g_free (module->filename);
271 G_OBJECT_CLASS (g_io_module_parent_class)->finalize (object);
275 g_io_module_load_module (GTypeModule *gmodule)
277 GIOModule *module = G_IO_MODULE (gmodule);
279 if (!module->filename)
281 g_warning ("GIOModule path not set");
285 module->library = g_module_open (module->filename, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
287 if (!module->library)
289 g_printerr ("%s\n", g_module_error ());
293 /* Make sure that the loaded library contains the required methods */
294 if (! g_module_symbol (module->library,
296 (gpointer) &module->load) ||
297 ! g_module_symbol (module->library,
298 "g_io_module_unload",
299 (gpointer) &module->unload))
301 g_printerr ("%s\n", g_module_error ());
302 g_module_close (module->library);
307 /* Initialize the loaded module */
308 module->load (module);
309 module->initialized = TRUE;
315 g_io_module_unload_module (GTypeModule *gmodule)
317 GIOModule *module = G_IO_MODULE (gmodule);
319 module->unload (module);
321 g_module_close (module->library);
322 module->library = NULL;
325 module->unload = NULL;
330 * @filename: filename of the shared library module.
332 * Creates a new GIOModule that will load the specific
333 * shared library when in use.
335 * Returns: a #GIOModule from given @filename,
339 g_io_module_new (const gchar *filename)
343 g_return_val_if_fail (filename != NULL, NULL);
345 module = g_object_new (G_IO_TYPE_MODULE, NULL);
346 module->filename = g_strdup (filename);
352 is_valid_module_name (const gchar *basename,
353 GIOModuleScope *scope)
357 #if !defined(G_OS_WIN32) && !defined(G_WITH_CYGWIN)
358 if (!g_str_has_prefix (basename, "lib") ||
359 !g_str_has_suffix (basename, ".so"))
362 if (!g_str_has_suffix (basename, ".dll"))
369 result = _g_io_module_scope_contains (scope, basename) ? FALSE : TRUE;
370 if (result && (scope->flags & G_IO_MODULE_SCOPE_BLOCK_DUPLICATES))
371 g_io_module_scope_block (scope, basename);
379 * g_io_modules_scan_all_in_directory_with_scope:
380 * @dirname: pathname for a directory containing modules to scan.
381 * @scope: a scope to use when scanning the modules
383 * Scans all the modules in the specified directory, ensuring that
384 * any extension point implemented by a module is registered.
386 * This may not actually load and initialize all the types in each
387 * module, some modules may be lazily loaded and initialized when
388 * an extension point it implementes is used with e.g.
389 * g_io_extension_point_get_extensions() or
390 * g_io_extension_point_get_extension_by_name().
392 * If you need to guarantee that all types are loaded in all the modules,
393 * use g_io_modules_load_all_in_directory().
398 g_io_modules_scan_all_in_directory_with_scope (const char *dirname,
399 GIOModuleScope *scope)
409 if (!g_module_supported ())
412 dir = g_dir_open (dirname, 0, NULL);
416 filename = g_build_filename (dirname, "giomodule.cache", NULL);
418 cache = g_hash_table_new_full (g_str_hash, g_str_equal,
419 g_free, (GDestroyNotify)g_strfreev);
422 if (g_stat (filename, &statbuf) == 0 &&
423 g_file_get_contents (filename, &data, NULL, NULL))
428 /* Cache mtime is the time the cache file was created, any file
429 * that has a ctime before this was created then and not modified
430 * since then (userspace can't change ctime). Its possible to change
431 * the ctime forward without changing the file content, by e.g.
432 * chmoding the file, but this is uncommon and will only cause us
433 * to not use the cache so will not cause bugs.
435 cache_mtime = statbuf.st_mtime;
437 lines = g_strsplit (data, "\n", -1);
440 for (i = 0; lines[i] != NULL; i++)
442 char *line = lines[i];
445 char **extension_points;
450 colon = strchr (line, ':');
451 if (colon == NULL || line == colon)
452 continue; /* Invalid line, ignore */
454 *colon = 0; /* terminate filename */
455 file = g_strdup (line);
456 colon++; /* after colon */
458 while (g_ascii_isspace (*colon))
461 extension_points = g_strsplit (colon, ",", -1);
462 g_hash_table_insert (cache, file, extension_points);
467 while ((name = g_dir_read_name (dir)))
469 if (is_valid_module_name (name, scope))
471 GIOExtensionPoint *extension_point;
474 char **extension_points;
477 path = g_build_filename (dirname, name, NULL);
478 module = g_io_module_new (path);
480 extension_points = g_hash_table_lookup (cache, name);
481 if (extension_points != NULL &&
482 g_stat (path, &statbuf) == 0 &&
483 statbuf.st_ctime <= cache_mtime)
485 /* Lazy load/init the library when first required */
486 for (i = 0; extension_points[i] != NULL; i++)
489 g_io_extension_point_register (extension_points[i]);
490 extension_point->lazy_load_modules =
491 g_list_prepend (extension_point->lazy_load_modules,
492 g_object_ref (module));
497 /* Try to load and init types */
498 if (g_type_module_use (G_TYPE_MODULE (module)))
499 g_type_module_unuse (G_TYPE_MODULE (module)); /* Unload */
500 else /* Failure to load */
501 g_printerr ("Failed to load module: %s\n", path);
504 g_object_unref (module);
511 g_hash_table_destroy (cache);
517 * g_io_modules_scan_all_in_directory:
518 * @dirname: pathname for a directory containing modules to scan.
520 * Scans all the modules in the specified directory, ensuring that
521 * any extension point implemented by a module is registered.
523 * This may not actually load and initialize all the types in each
524 * module, some modules may be lazily loaded and initialized when
525 * an extension point it implementes is used with e.g.
526 * g_io_extension_point_get_extensions() or
527 * g_io_extension_point_get_extension_by_name().
529 * If you need to guarantee that all types are loaded in all the modules,
530 * use g_io_modules_load_all_in_directory().
535 g_io_modules_scan_all_in_directory (const char *dirname)
537 g_io_modules_scan_all_in_directory_with_scope (dirname, NULL);
541 * g_io_modules_load_all_in_directory_with_scope:
542 * @dirname: pathname for a directory containing modules to load.
543 * @scope: a scope to use when scanning the modules.
545 * Loads all the modules in the specified directory.
547 * If don't require all modules to be initialized (and thus registering
548 * all gtypes) then you can use g_io_modules_scan_all_in_directory()
549 * which allows delayed/lazy loading of modules.
551 * Returns: (element-type GIOModule) (transfer full): a list of #GIOModules loaded
552 * from the directory,
553 * All the modules are loaded into memory, if you want to
554 * unload them (enabling on-demand loading) you must call
555 * g_type_module_unuse() on all the modules. Free the list
556 * with g_list_free().
561 g_io_modules_load_all_in_directory_with_scope (const char *dirname,
562 GIOModuleScope *scope)
568 if (!g_module_supported ())
571 dir = g_dir_open (dirname, 0, NULL);
576 while ((name = g_dir_read_name (dir)))
578 if (is_valid_module_name (name, scope))
583 path = g_build_filename (dirname, name, NULL);
584 module = g_io_module_new (path);
586 if (!g_type_module_use (G_TYPE_MODULE (module)))
588 g_printerr ("Failed to load module: %s\n", path);
589 g_object_unref (module);
596 modules = g_list_prepend (modules, module);
606 * g_io_modules_load_all_in_directory:
607 * @dirname: pathname for a directory containing modules to load.
609 * Loads all the modules in the specified directory.
611 * If don't require all modules to be initialized (and thus registering
612 * all gtypes) then you can use g_io_modules_scan_all_in_directory()
613 * which allows delayed/lazy loading of modules.
615 * Returns: (element-type GIOModule) (transfer full): a list of #GIOModules loaded
616 * from the directory,
617 * All the modules are loaded into memory, if you want to
618 * unload them (enabling on-demand loading) you must call
619 * g_type_module_unuse() on all the modules. Free the list
620 * with g_list_free().
623 g_io_modules_load_all_in_directory (const char *dirname)
625 return g_io_modules_load_all_in_directory_with_scope (dirname, NULL);
629 try_class (GIOExtension *extension,
630 guint is_supported_offset)
632 GType type = g_io_extension_get_type (extension);
633 typedef gboolean (*verify_func) (void);
636 class = g_type_class_ref (type);
637 if (!is_supported_offset || (* G_STRUCT_MEMBER(verify_func, class, is_supported_offset)) ())
640 g_type_class_unref (class);
645 * _g_io_module_get_default_type:
646 * @extension_point: the name of an extension point
647 * @envvar: (allow-none): the name of an environment variable to
648 * override the default implementation.
649 * @is_supported_offset: a vtable offset, or zero
651 * Retrieves the default class implementing @extension_point.
653 * If @envvar is not %NULL, and the environment variable with that
654 * name is set, then the implementation it specifies will be tried
655 * first. After that, or if @envvar is not set, all other
656 * implementations will be tried in order of decreasing priority.
658 * If @is_supported_offset is non-zero, then it is the offset into the
659 * class vtable at which there is a function that takes no arguments and
660 * returns a boolean. This function will be called on each candidate
661 * implementation to check if it is actually usable or not.
663 * The result is cached after it is generated the first time, and
664 * the function is thread-safe.
666 * Return value: (transfer none): an object implementing
667 * @extension_point, or %NULL if there are no usable
671 _g_io_module_get_default_type (const gchar *extension_point,
673 guint is_supported_offset)
675 static GRecMutex default_modules_lock;
676 static GHashTable *default_modules;
677 const char *use_this;
679 GIOExtensionPoint *ep;
680 GIOExtension *extension, *preferred;
683 g_rec_mutex_lock (&default_modules_lock);
688 if (g_hash_table_lookup_extended (default_modules, extension_point, &key, &impl))
690 g_rec_mutex_unlock (&default_modules_lock);
691 return impl ? G_OBJECT_CLASS_TYPE (impl) : G_TYPE_INVALID;
696 default_modules = g_hash_table_new (g_str_hash, g_str_equal);
699 _g_io_modules_ensure_loaded ();
700 ep = g_io_extension_point_lookup (extension_point);
704 g_warn_if_reached ();
705 g_rec_mutex_unlock (&default_modules_lock);
706 return G_TYPE_INVALID;
709 use_this = envvar ? g_getenv (envvar) : NULL;
712 preferred = g_io_extension_point_get_extension_by_name (ep, use_this);
715 impl = try_class (preferred, is_supported_offset);
720 g_warning ("Can't find module '%s' specified in %s", use_this, envvar);
725 for (l = g_io_extension_point_get_extensions (ep); l != NULL; l = l->next)
728 if (extension == preferred)
731 impl = try_class (extension, is_supported_offset);
739 g_hash_table_insert (default_modules, g_strdup (extension_point), impl);
740 g_rec_mutex_unlock (&default_modules_lock);
742 return impl ? G_OBJECT_CLASS_TYPE (impl) : G_TYPE_INVALID;
746 try_implementation (GIOExtension *extension,
747 GIOModuleVerifyFunc verify_func)
749 GType type = g_io_extension_get_type (extension);
752 if (g_type_is_a (type, G_TYPE_INITABLE))
753 return g_initable_new (type, NULL, NULL, NULL);
756 impl = g_object_new (type, NULL);
757 if (!verify_func || verify_func (impl))
760 g_object_unref (impl);
766 * _g_io_module_get_default:
767 * @extension_point: the name of an extension point
768 * @envvar: (allow-none): the name of an environment variable to
769 * override the default implementation.
770 * @verify_func: (allow-none): a function to call to verify that
771 * a given implementation is usable in the current environment.
773 * Retrieves the default object implementing @extension_point.
775 * If @envvar is not %NULL, and the environment variable with that
776 * name is set, then the implementation it specifies will be tried
777 * first. After that, or if @envvar is not set, all other
778 * implementations will be tried in order of decreasing priority.
780 * If an extension point implementation implements #GInitable, then
781 * that implementation will only be used if it initializes
782 * successfully. Otherwise, if @verify_func is not %NULL, then it will
783 * be called on each candidate implementation after construction, to
784 * check if it is actually usable or not.
786 * The result is cached after it is generated the first time, and
787 * the function is thread-safe.
789 * Return value: (transfer none): an object implementing
790 * @extension_point, or %NULL if there are no usable
794 _g_io_module_get_default (const gchar *extension_point,
796 GIOModuleVerifyFunc verify_func)
798 static GRecMutex default_modules_lock;
799 static GHashTable *default_modules;
800 const char *use_this;
802 GIOExtensionPoint *ep;
803 GIOExtension *extension, *preferred;
806 g_rec_mutex_lock (&default_modules_lock);
811 if (g_hash_table_lookup_extended (default_modules, extension_point,
814 g_rec_mutex_unlock (&default_modules_lock);
820 default_modules = g_hash_table_new (g_str_hash, g_str_equal);
823 _g_io_modules_ensure_loaded ();
824 ep = g_io_extension_point_lookup (extension_point);
828 g_warn_if_reached ();
829 g_rec_mutex_unlock (&default_modules_lock);
833 use_this = envvar ? g_getenv (envvar) : NULL;
836 preferred = g_io_extension_point_get_extension_by_name (ep, use_this);
839 impl = try_implementation (preferred, verify_func);
844 g_warning ("Can't find module '%s' specified in %s", use_this, envvar);
849 for (l = g_io_extension_point_get_extensions (ep); l != NULL; l = l->next)
852 if (extension == preferred)
855 impl = try_implementation (extension, verify_func);
863 g_hash_table_insert (default_modules,
864 g_strdup (extension_point), impl);
865 g_rec_mutex_unlock (&default_modules_lock);
870 G_LOCK_DEFINE_STATIC (registered_extensions);
871 G_LOCK_DEFINE_STATIC (loaded_dirs);
873 extern GType _g_fen_directory_monitor_get_type (void);
874 extern GType _g_fen_file_monitor_get_type (void);
875 extern GType _g_inotify_directory_monitor_get_type (void);
876 extern GType _g_inotify_file_monitor_get_type (void);
877 extern GType _g_kqueue_directory_monitor_get_type (void);
878 extern GType _g_kqueue_file_monitor_get_type (void);
879 extern GType _g_unix_volume_monitor_get_type (void);
880 extern GType _g_local_vfs_get_type (void);
882 extern GType _g_win32_volume_monitor_get_type (void);
883 extern GType g_win32_directory_monitor_get_type (void);
884 extern GType _g_winhttp_vfs_get_type (void);
886 extern GType _g_dummy_proxy_resolver_get_type (void);
887 extern GType _g_dummy_tls_backend_get_type (void);
888 extern GType g_network_monitor_base_get_type (void);
890 extern GType _g_network_monitor_netlink_get_type (void);
894 extern GType g_fdo_notification_backend_get_type (void);
895 extern GType g_gtk_notification_backend_get_type (void);
898 #ifdef G_PLATFORM_WIN32
902 static HMODULE gio_dll = NULL;
906 BOOL WINAPI DllMain (HINSTANCE hinstDLL,
911 DllMain (HINSTANCE hinstDLL,
915 if (fdwReason == DLL_PROCESS_ATTACH)
924 _g_io_win32_get_module (void)
927 GetModuleHandleExA (GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
928 (const char *) _g_io_win32_get_module,
933 #undef GIO_MODULE_DIR
935 /* GIO_MODULE_DIR is used only in code called just once,
936 * so no problem leaking this
938 #define GIO_MODULE_DIR \
939 g_build_filename (g_win32_get_package_installation_directory_of_module (gio_dll), \
946 _g_io_modules_ensure_extension_points_registered (void)
948 static gboolean registered_extensions = FALSE;
949 GIOExtensionPoint *ep;
951 G_LOCK (registered_extensions);
953 if (!registered_extensions)
955 registered_extensions = TRUE;
958 #if !GLIB_CHECK_VERSION (3, 0, 0)
959 ep = g_io_extension_point_register (G_DESKTOP_APP_INFO_LOOKUP_EXTENSION_POINT_NAME);
960 G_GNUC_BEGIN_IGNORE_DEPRECATIONS
961 g_io_extension_point_set_required_type (ep, G_TYPE_DESKTOP_APP_INFO_LOOKUP);
962 G_GNUC_END_IGNORE_DEPRECATIONS
966 ep = g_io_extension_point_register (G_LOCAL_DIRECTORY_MONITOR_EXTENSION_POINT_NAME);
967 g_io_extension_point_set_required_type (ep, G_TYPE_LOCAL_DIRECTORY_MONITOR);
969 ep = g_io_extension_point_register (G_LOCAL_FILE_MONITOR_EXTENSION_POINT_NAME);
970 g_io_extension_point_set_required_type (ep, G_TYPE_LOCAL_FILE_MONITOR);
972 ep = g_io_extension_point_register (G_NFS_DIRECTORY_MONITOR_EXTENSION_POINT_NAME);
973 g_io_extension_point_set_required_type (ep, G_TYPE_LOCAL_DIRECTORY_MONITOR);
975 ep = g_io_extension_point_register (G_NFS_FILE_MONITOR_EXTENSION_POINT_NAME);
976 g_io_extension_point_set_required_type (ep, G_TYPE_LOCAL_FILE_MONITOR);
978 ep = g_io_extension_point_register (G_VOLUME_MONITOR_EXTENSION_POINT_NAME);
979 g_io_extension_point_set_required_type (ep, G_TYPE_VOLUME_MONITOR);
981 ep = g_io_extension_point_register (G_NATIVE_VOLUME_MONITOR_EXTENSION_POINT_NAME);
982 g_io_extension_point_set_required_type (ep, G_TYPE_NATIVE_VOLUME_MONITOR);
984 ep = g_io_extension_point_register (G_VFS_EXTENSION_POINT_NAME);
985 g_io_extension_point_set_required_type (ep, G_TYPE_VFS);
987 ep = g_io_extension_point_register ("gsettings-backend");
988 g_io_extension_point_set_required_type (ep, G_TYPE_OBJECT);
990 ep = g_io_extension_point_register (G_PROXY_RESOLVER_EXTENSION_POINT_NAME);
991 g_io_extension_point_set_required_type (ep, G_TYPE_PROXY_RESOLVER);
993 ep = g_io_extension_point_register (G_PROXY_EXTENSION_POINT_NAME);
994 g_io_extension_point_set_required_type (ep, G_TYPE_PROXY);
996 ep = g_io_extension_point_register (G_TLS_BACKEND_EXTENSION_POINT_NAME);
997 g_io_extension_point_set_required_type (ep, G_TYPE_TLS_BACKEND);
999 ep = g_io_extension_point_register (G_NETWORK_MONITOR_EXTENSION_POINT_NAME);
1000 g_io_extension_point_set_required_type (ep, G_TYPE_NETWORK_MONITOR);
1002 ep = g_io_extension_point_register (G_NOTIFICATION_BACKEND_EXTENSION_POINT_NAME);
1003 g_io_extension_point_set_required_type (ep, G_TYPE_NOTIFICATION_BACKEND);
1006 G_UNLOCK (registered_extensions);
1010 _g_io_modules_ensure_loaded (void)
1012 static gboolean loaded_dirs = FALSE;
1013 const char *module_path;
1014 GIOModuleScope *scope;
1016 _g_io_modules_ensure_extension_points_registered ();
1018 G_LOCK (loaded_dirs);
1023 scope = g_io_module_scope_new (G_IO_MODULE_SCOPE_BLOCK_DUPLICATES);
1025 /* First load any overrides, extras */
1026 module_path = g_getenv ("GIO_EXTRA_MODULES");
1032 paths = g_strsplit (module_path, G_SEARCHPATH_SEPARATOR_S, 0);
1034 for (i = 0; paths[i] != NULL; i++)
1036 g_io_modules_scan_all_in_directory_with_scope (paths[i], scope);
1042 /* Then load the compiled in path */
1043 g_io_modules_scan_all_in_directory_with_scope (GIO_MODULE_DIR, scope);
1045 g_io_module_scope_free (scope);
1047 /* Initialize types from built-in "modules" */
1048 g_type_ensure (g_null_settings_backend_get_type ());
1049 g_type_ensure (g_memory_settings_backend_get_type ());
1050 #if defined(HAVE_SYS_INOTIFY_H) || defined(HAVE_LINUX_INOTIFY_H)
1051 g_type_ensure (_g_inotify_directory_monitor_get_type ());
1052 g_type_ensure (_g_inotify_file_monitor_get_type ());
1054 #if defined(HAVE_KQUEUE)
1055 g_type_ensure (_g_kqueue_directory_monitor_get_type ());
1056 g_type_ensure (_g_kqueue_file_monitor_get_type ());
1058 #if defined(HAVE_FEN)
1059 g_type_ensure (_g_fen_directory_monitor_get_type ());
1060 g_type_ensure (_g_fen_file_monitor_get_type ());
1063 g_type_ensure (_g_win32_volume_monitor_get_type ());
1064 g_type_ensure (g_win32_directory_monitor_get_type ());
1065 g_type_ensure (g_registry_backend_get_type ());
1068 g_nextstep_settings_backend_get_type ();
1071 g_type_ensure (_g_unix_volume_monitor_get_type ());
1072 g_type_ensure (g_fdo_notification_backend_get_type ());
1073 g_type_ensure (g_gtk_notification_backend_get_type ());
1076 g_type_ensure (_g_winhttp_vfs_get_type ());
1078 g_type_ensure (_g_local_vfs_get_type ());
1079 g_type_ensure (_g_dummy_proxy_resolver_get_type ());
1080 g_type_ensure (_g_socks4a_proxy_get_type ());
1081 g_type_ensure (_g_socks4_proxy_get_type ());
1082 g_type_ensure (_g_socks5_proxy_get_type ());
1083 g_type_ensure (_g_dummy_tls_backend_get_type ());
1084 g_type_ensure (g_network_monitor_base_get_type ());
1086 g_type_ensure (_g_network_monitor_netlink_get_type ());
1090 G_UNLOCK (loaded_dirs);
1094 g_io_extension_point_free (GIOExtensionPoint *ep)
1100 for (walk = ep->extensions; walk != NULL; walk = walk->next)
1102 GIOExtension *extension = walk->data;
1104 g_free (extension->name);
1105 g_slice_free (GIOExtension, extension);
1107 g_list_free_full (ep->lazy_load_modules, g_object_unref);
1108 g_list_free (ep->extensions);
1114 * g_io_extension_point_register:
1115 * @name: The name of the extension point
1117 * Registers an extension point.
1119 * Returns: (transfer none): the new #GIOExtensionPoint. This object is
1120 * owned by GIO and should not be freed.
1123 g_io_extension_point_register (const char *name)
1125 GIOExtensionPoint *ep;
1127 G_LOCK (extension_points);
1128 if (extension_points == NULL)
1129 extension_points = g_hash_table_new_full (g_str_hash,
1132 (GDestroyNotify)g_io_extension_point_free);
1134 ep = g_hash_table_lookup (extension_points, name);
1137 G_UNLOCK (extension_points);
1141 ep = g_new0 (GIOExtensionPoint, 1);
1142 ep->name = g_strdup (name);
1144 g_hash_table_insert (extension_points, ep->name, ep);
1146 G_UNLOCK (extension_points);
1152 * g_io_extension_point_lookup:
1153 * @name: the name of the extension point
1155 * Looks up an existing extension point.
1157 * Returns: (transfer none): the #GIOExtensionPoint, or %NULL if there
1158 * is no registered extension point with the given name.
1161 g_io_extension_point_lookup (const char *name)
1163 GIOExtensionPoint *ep;
1165 G_LOCK (extension_points);
1167 if (extension_points != NULL)
1168 ep = g_hash_table_lookup (extension_points, name);
1170 G_UNLOCK (extension_points);
1177 * g_io_extension_point_set_required_type:
1178 * @extension_point: a #GIOExtensionPoint
1179 * @type: the #GType to require
1181 * Sets the required type for @extension_point to @type.
1182 * All implementations must henceforth have this type.
1185 g_io_extension_point_set_required_type (GIOExtensionPoint *extension_point,
1188 extension_point->required_type = type;
1192 * g_io_extension_point_get_required_type:
1193 * @extension_point: a #GIOExtensionPoint
1195 * Gets the required type for @extension_point.
1197 * Returns: the #GType that all implementations must have,
1198 * or #G_TYPE_INVALID if the extension point has no required type
1201 g_io_extension_point_get_required_type (GIOExtensionPoint *extension_point)
1203 return extension_point->required_type;
1207 lazy_load_modules (GIOExtensionPoint *extension_point)
1212 for (l = extension_point->lazy_load_modules; l != NULL; l = l->next)
1216 if (!module->initialized)
1218 if (g_type_module_use (G_TYPE_MODULE (module)))
1219 g_type_module_unuse (G_TYPE_MODULE (module)); /* Unload */
1221 g_printerr ("Failed to load module: %s\n",
1228 * g_io_extension_point_get_extensions:
1229 * @extension_point: a #GIOExtensionPoint
1231 * Gets a list of all extensions that implement this extension point.
1232 * The list is sorted by priority, beginning with the highest priority.
1234 * Returns: (element-type GIOExtension) (transfer none): a #GList of
1235 * #GIOExtension<!-- -->s. The list is owned by GIO and should not be
1239 g_io_extension_point_get_extensions (GIOExtensionPoint *extension_point)
1241 lazy_load_modules (extension_point);
1242 return extension_point->extensions;
1246 * g_io_extension_point_get_extension_by_name:
1247 * @extension_point: a #GIOExtensionPoint
1248 * @name: the name of the extension to get
1250 * Finds a #GIOExtension for an extension point by name.
1252 * Returns: (transfer none): the #GIOExtension for @extension_point that has the
1253 * given name, or %NULL if there is no extension with that name
1256 g_io_extension_point_get_extension_by_name (GIOExtensionPoint *extension_point,
1261 lazy_load_modules (extension_point);
1262 for (l = extension_point->extensions; l != NULL; l = l->next)
1264 GIOExtension *e = l->data;
1266 if (e->name != NULL &&
1267 strcmp (e->name, name) == 0)
1275 extension_prio_compare (gconstpointer a,
1278 const GIOExtension *extension_a = a, *extension_b = b;
1280 if (extension_a->priority > extension_b->priority)
1283 if (extension_b->priority > extension_a->priority)
1290 * g_io_extension_point_implement:
1291 * @extension_point_name: the name of the extension point
1292 * @type: the #GType to register as extension
1293 * @extension_name: the name for the extension
1294 * @priority: the priority for the extension
1296 * Registers @type as extension for the extension point with name
1297 * @extension_point_name.
1299 * If @type has already been registered as an extension for this
1300 * extension point, the existing #GIOExtension object is returned.
1302 * Returns: (transfer none): a #GIOExtension object for #GType
1305 g_io_extension_point_implement (const char *extension_point_name,
1307 const char *extension_name,
1310 GIOExtensionPoint *extension_point;
1311 GIOExtension *extension;
1314 g_return_val_if_fail (extension_point_name != NULL, NULL);
1316 extension_point = g_io_extension_point_lookup (extension_point_name);
1317 if (extension_point == NULL)
1319 g_warning ("Tried to implement non-registered extension point %s", extension_point_name);
1323 if (extension_point->required_type != 0 &&
1324 !g_type_is_a (type, extension_point->required_type))
1326 g_warning ("Tried to register an extension of the type %s to extension point %s. "
1327 "Expected type is %s.",
1329 extension_point_name,
1330 g_type_name (extension_point->required_type));
1334 /* It's safe to register the same type multiple times */
1335 for (l = extension_point->extensions; l != NULL; l = l->next)
1337 extension = l->data;
1338 if (extension->type == type)
1342 extension = g_slice_new0 (GIOExtension);
1343 extension->type = type;
1344 extension->name = g_strdup (extension_name);
1345 extension->priority = priority;
1347 extension_point->extensions = g_list_insert_sorted (extension_point->extensions,
1348 extension, extension_prio_compare);
1354 * g_io_extension_ref_class:
1355 * @extension: a #GIOExtension
1357 * Gets a reference to the class for the type that is
1358 * associated with @extension.
1360 * Returns: (transfer full): the #GTypeClass for the type of @extension
1363 g_io_extension_ref_class (GIOExtension *extension)
1365 return g_type_class_ref (extension->type);
1369 * g_io_extension_get_type:
1370 * @extension: a #GIOExtension
1372 * Gets the type associated with @extension.
1374 * Returns: the type of @extension
1377 g_io_extension_get_type (GIOExtension *extension)
1379 return extension->type;
1383 * g_io_extension_get_name:
1384 * @extension: a #GIOExtension
1386 * Gets the name under which @extension was registered.
1388 * Note that the same type may be registered as extension
1389 * for multiple extension points, under different names.
1391 * Returns: the name of @extension.
1394 g_io_extension_get_name (GIOExtension *extension)
1396 return extension->name;
1400 * g_io_extension_get_priority:
1401 * @extension: a #GIOExtension
1403 * Gets the priority with which @extension was registered.
1405 * Returns: the priority of @extension
1408 g_io_extension_get_priority (GIOExtension *extension)
1410 return extension->priority;