| /* GIO - GLib Input, Output and Streaming Library |
| * |
| * Copyright (C) 2006-2007 Red Hat, Inc. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General |
| * Public License along with this library; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
| * Boston, MA 02111-1307, USA. |
| * |
| * Author: Alexander Larsson <alexl@redhat.com> |
| */ |
| |
| #include "config.h" |
| |
| #include <string.h> |
| |
| #include "giomodule.h" |
| #include "giomodule-priv.h" |
| #include "gmemorysettingsbackend.h" |
| #include "glocalfilemonitor.h" |
| #include "glocaldirectorymonitor.h" |
| #include "gnativevolumemonitor.h" |
| #include "gvfs.h" |
| #ifdef G_OS_UNIX |
| #include "gdesktopappinfo.h" |
| #endif |
| #include <glib/gstdio.h> |
| |
| /** |
| * SECTION:giomodule |
| * @short_description: Loadable GIO Modules |
| * @include: gio/gio.h |
| * |
| * Provides an interface and default functions for loading and unloading |
| * modules. This is used internally to make GIO extensible, but can also |
| * be used by others to implement module loading. |
| * |
| **/ |
| |
| /** |
| * SECTION:extensionpoints |
| * @short_description: Extension Points |
| * @include: gio.h |
| * @see_also: <link linkend="extending-gio">Extending GIO</link> |
| * |
| * #GIOExtensionPoint provides a mechanism for modules to extend the |
| * functionality of the library or application that loaded it in an |
| * organized fashion. |
| * |
| * An extension point is identified by a name, and it may optionally |
| * require that any implementation must by of a certain type (or derived |
| * thereof). Use g_io_extension_point_register() to register an |
| * extension point, and g_io_extension_point_set_required_type() to |
| * set a required type. |
| * |
| * A module can implement an extension point by specifying the #GType |
| * that implements the functionality. Additionally, each implementation |
| * of an extension point has a name, and a priority. Use |
| * g_io_extension_point_implement() to implement an extension point. |
| * |
| * |[ |
| * GIOExtensionPoint *ep; |
| * |
| * /* Register an extension point */ |
| * ep = g_io_extension_point_register ("my-extension-point"); |
| * g_io_extension_point_set_required_type (ep, MY_TYPE_EXAMPLE); |
| * ]| |
| * |
| * |[ |
| * /* Implement an extension point */ |
| * G_DEFINE_TYPE (MyExampleImpl, my_example_impl, MY_TYPE_EXAMPLE); |
| * g_io_extension_point_implement ("my-extension-point", |
| * my_example_impl_get_type (), |
| * "my-example", |
| * 10); |
| * ]| |
| * |
| * It is up to the code that registered the extension point how |
| * it uses the implementations that have been associated with it. |
| * Depending on the use case, it may use all implementations, or |
| * only the one with the highest priority, or pick a specific |
| * one by name. |
| * |
| * To avoid opening all modules just to find out what extension |
| * points they implement, GIO makes use of a caching mechanism, |
| * see <link linkend="gio-querymodules">gio-querymodules</link>. |
| * You are expected to run this command after installing a |
| * GIO module. |
| */ |
| struct _GIOModule { |
| GTypeModule parent_instance; |
| |
| gchar *filename; |
| GModule *library; |
| gboolean initialized; /* The module was loaded at least once */ |
| |
| void (* load) (GIOModule *module); |
| void (* unload) (GIOModule *module); |
| }; |
| |
| struct _GIOModuleClass |
| { |
| GTypeModuleClass parent_class; |
| |
| }; |
| |
| static void g_io_module_finalize (GObject *object); |
| static gboolean g_io_module_load_module (GTypeModule *gmodule); |
| static void g_io_module_unload_module (GTypeModule *gmodule); |
| |
| struct _GIOExtension { |
| char *name; |
| GType type; |
| gint priority; |
| }; |
| |
| struct _GIOExtensionPoint { |
| GType required_type; |
| char *name; |
| GList *extensions; |
| GList *lazy_load_modules; |
| }; |
| |
| static GHashTable *extension_points = NULL; |
| G_LOCK_DEFINE_STATIC(extension_points); |
| |
| G_DEFINE_TYPE (GIOModule, g_io_module, G_TYPE_TYPE_MODULE); |
| |
| static void |
| g_io_module_class_init (GIOModuleClass *class) |
| { |
| GObjectClass *object_class = G_OBJECT_CLASS (class); |
| GTypeModuleClass *type_module_class = G_TYPE_MODULE_CLASS (class); |
| |
| object_class->finalize = g_io_module_finalize; |
| |
| type_module_class->load = g_io_module_load_module; |
| type_module_class->unload = g_io_module_unload_module; |
| } |
| |
| static void |
| g_io_module_init (GIOModule *module) |
| { |
| } |
| |
| static void |
| g_io_module_finalize (GObject *object) |
| { |
| GIOModule *module = G_IO_MODULE (object); |
| |
| g_free (module->filename); |
| |
| G_OBJECT_CLASS (g_io_module_parent_class)->finalize (object); |
| } |
| |
| static gboolean |
| g_io_module_load_module (GTypeModule *gmodule) |
| { |
| GIOModule *module = G_IO_MODULE (gmodule); |
| |
| if (!module->filename) |
| { |
| g_warning ("GIOModule path not set"); |
| return FALSE; |
| } |
| |
| module->library = g_module_open (module->filename, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL); |
| |
| if (!module->library) |
| { |
| g_printerr ("%s\n", g_module_error ()); |
| return FALSE; |
| } |
| |
| /* Make sure that the loaded library contains the required methods */ |
| if (! g_module_symbol (module->library, |
| "g_io_module_load", |
| (gpointer) &module->load) || |
| ! g_module_symbol (module->library, |
| "g_io_module_unload", |
| (gpointer) &module->unload)) |
| { |
| g_printerr ("%s\n", g_module_error ()); |
| g_module_close (module->library); |
| |
| return FALSE; |
| } |
| |
| /* Initialize the loaded module */ |
| module->load (module); |
| module->initialized = TRUE; |
| |
| return TRUE; |
| } |
| |
| static void |
| g_io_module_unload_module (GTypeModule *gmodule) |
| { |
| GIOModule *module = G_IO_MODULE (gmodule); |
| |
| module->unload (module); |
| |
| g_module_close (module->library); |
| module->library = NULL; |
| |
| module->load = NULL; |
| module->unload = NULL; |
| } |
| |
| /** |
| * g_io_module_new: |
| * @filename: filename of the shared library module. |
| * |
| * Creates a new GIOModule that will load the specific |
| * shared library when in use. |
| * |
| * Returns: a #GIOModule from given @filename, |
| * or %NULL on error. |
| **/ |
| GIOModule * |
| g_io_module_new (const gchar *filename) |
| { |
| GIOModule *module; |
| |
| g_return_val_if_fail (filename != NULL, NULL); |
| |
| module = g_object_new (G_IO_TYPE_MODULE, NULL); |
| module->filename = g_strdup (filename); |
| |
| return module; |
| } |
| |
| static gboolean |
| is_valid_module_name (const gchar *basename) |
| { |
| #if !defined(G_OS_WIN32) && !defined(G_WITH_CYGWIN) |
| return |
| g_str_has_prefix (basename, "lib") && |
| g_str_has_suffix (basename, ".so"); |
| #else |
| return g_str_has_suffix (basename, ".dll"); |
| #endif |
| } |
| |
| /** |
| * g_io_modules_scan_all_in_directory: |
| * @dirname: pathname for a directory containing modules to scan. |
| * |
| * Scans all the modules in the specified directory, ensuring that |
| * any extension point implemented by a module is registered. |
| * |
| * This may not actually load and initialize all the types in each |
| * module, some modules may be lazily loaded and initialized when |
| * an extension point it implementes is used with e.g. |
| * g_io_extension_point_get_extensions() or |
| * g_io_extension_point_get_extension_by_name(). |
| * |
| * If you need to guarantee that all types are loaded in all the modules, |
| * use g_io_modules_scan_all_in_directory(). |
| * |
| * Since: 2.24 |
| **/ |
| void |
| g_io_modules_scan_all_in_directory (const char *dirname) |
| { |
| const gchar *name; |
| char *filename; |
| GDir *dir; |
| GStatBuf statbuf; |
| char *data; |
| time_t cache_mtime; |
| GHashTable *cache; |
| |
| if (!g_module_supported ()) |
| return; |
| |
| dir = g_dir_open (dirname, 0, NULL); |
| if (!dir) |
| return; |
| |
| filename = g_build_filename (dirname, "giomodule.cache", NULL); |
| |
| cache = g_hash_table_new_full (g_str_hash, g_str_equal, |
| g_free, (GDestroyNotify)g_strfreev); |
| |
| cache_mtime = 0; |
| if (g_stat (filename, &statbuf) == 0 && |
| g_file_get_contents (filename, &data, NULL, NULL)) |
| { |
| char **lines; |
| int i; |
| |
| /* Cache mtime is the time the cache file was created, any file |
| * that has a ctime before this was created then and not modified |
| * since then (userspace can't change ctime). Its possible to change |
| * the ctime forward without changing the file content, by e.g. |
| * chmoding the file, but this is uncommon and will only cause us |
| * to not use the cache so will not cause bugs. |
| */ |
| cache_mtime = statbuf.st_mtime; |
| |
| lines = g_strsplit (data, "\n", -1); |
| g_free (data); |
| |
| for (i = 0; lines[i] != NULL; i++) |
| { |
| char *line = lines[i]; |
| char *file; |
| char *colon; |
| char **extension_points; |
| |
| if (line[0] == '#') |
| continue; |
| |
| colon = strchr (line, ':'); |
| if (colon == NULL || line == colon) |
| continue; /* Invalid line, ignore */ |
| |
| *colon = 0; /* terminate filename */ |
| file = g_strdup (line); |
| colon++; /* after colon */ |
| |
| while (g_ascii_isspace (*colon)) |
| colon++; |
| |
| extension_points = g_strsplit (colon, ",", -1); |
| g_hash_table_insert (cache, file, extension_points); |
| } |
| g_strfreev (lines); |
| } |
| |
| while ((name = g_dir_read_name (dir))) |
| { |
| if (is_valid_module_name (name)) |
| { |
| GIOExtensionPoint *extension_point; |
| GIOModule *module; |
| gchar *path; |
| char **extension_points; |
| int i; |
| |
| path = g_build_filename (dirname, name, NULL); |
| module = g_io_module_new (path); |
| |
| extension_points = g_hash_table_lookup (cache, name); |
| if (extension_points != NULL && |
| g_stat (path, &statbuf) == 0 && |
| statbuf.st_ctime <= cache_mtime) |
| { |
| /* Lazy load/init the library when first required */ |
| for (i = 0; extension_points[i] != NULL; i++) |
| { |
| extension_point = |
| g_io_extension_point_register (extension_points[i]); |
| extension_point->lazy_load_modules = |
| g_list_prepend (extension_point->lazy_load_modules, |
| module); |
| } |
| } |
| else |
| { |
| /* Try to load and init types */ |
| if (g_type_module_use (G_TYPE_MODULE (module))) |
| g_type_module_unuse (G_TYPE_MODULE (module)); /* Unload */ |
| else |
| { /* Failure to load */ |
| g_printerr ("Failed to load module: %s\n", path); |
| g_object_unref (module); |
| g_free (path); |
| continue; |
| } |
| } |
| |
| g_free (path); |
| } |
| } |
| |
| g_dir_close (dir); |
| |
| g_hash_table_destroy (cache); |
| |
| g_free (filename); |
| } |
| |
| |
| /** |
| * g_io_modules_load_all_in_directory: |
| * @dirname: pathname for a directory containing modules to load. |
| * |
| * Loads all the modules in the specified directory. |
| * |
| * If don't require all modules to be initialized (and thus registering |
| * all gtypes) then you can use g_io_modules_scan_all_in_directory() |
| * which allows delayed/lazy loading of modules. |
| * |
| * Returns: a list of #GIOModules loaded from the directory, |
| * All the modules are loaded into memory, if you want to |
| * unload them (enabling on-demand loading) you must call |
| * g_type_module_unuse() on all the modules. Free the list |
| * with g_list_free(). |
| **/ |
| GList * |
| g_io_modules_load_all_in_directory (const char *dirname) |
| { |
| const gchar *name; |
| GDir *dir; |
| GList *modules; |
| |
| if (!g_module_supported ()) |
| return NULL; |
| |
| dir = g_dir_open (dirname, 0, NULL); |
| if (!dir) |
| return NULL; |
| |
| modules = NULL; |
| while ((name = g_dir_read_name (dir))) |
| { |
| if (is_valid_module_name (name)) |
| { |
| GIOModule *module; |
| gchar *path; |
| |
| path = g_build_filename (dirname, name, NULL); |
| module = g_io_module_new (path); |
| |
| if (!g_type_module_use (G_TYPE_MODULE (module))) |
| { |
| g_printerr ("Failed to load module: %s\n", path); |
| g_object_unref (module); |
| g_free (path); |
| continue; |
| } |
| |
| g_free (path); |
| |
| modules = g_list_prepend (modules, module); |
| } |
| } |
| |
| g_dir_close (dir); |
| |
| return modules; |
| } |
| |
| G_LOCK_DEFINE_STATIC (registered_extensions); |
| G_LOCK_DEFINE_STATIC (loaded_dirs); |
| |
| extern GType _g_fen_directory_monitor_get_type (void); |
| extern GType _g_fen_file_monitor_get_type (void); |
| extern GType _g_inotify_directory_monitor_get_type (void); |
| extern GType _g_inotify_file_monitor_get_type (void); |
| extern GType _g_unix_volume_monitor_get_type (void); |
| extern GType _g_local_vfs_get_type (void); |
| |
| extern GType _g_win32_volume_monitor_get_type (void); |
| extern GType g_win32_directory_monitor_get_type (void); |
| extern GType _g_winhttp_vfs_get_type (void); |
| |
| #ifdef G_PLATFORM_WIN32 |
| |
| #include <windows.h> |
| |
| static HMODULE gio_dll = NULL; |
| |
| #ifdef DLL_EXPORT |
| |
| BOOL WINAPI |
| DllMain (HINSTANCE hinstDLL, |
| DWORD fdwReason, |
| LPVOID lpvReserved) |
| { |
| if (fdwReason == DLL_PROCESS_ATTACH) |
| gio_dll = hinstDLL; |
| |
| return TRUE; |
| } |
| |
| #endif |
| |
| #undef GIO_MODULE_DIR |
| |
| /* GIO_MODULE_DIR is used only in code called just once, |
| * so no problem leaking this |
| */ |
| #define GIO_MODULE_DIR \ |
| g_build_filename (g_win32_get_package_installation_directory_of_module (gio_dll), \ |
| "lib/gio/modules", \ |
| NULL) |
| |
| #endif |
| |
| void |
| _g_io_modules_ensure_extension_points_registered (void) |
| { |
| static gboolean registered_extensions = FALSE; |
| GIOExtensionPoint *ep; |
| |
| G_LOCK (registered_extensions); |
| |
| if (!registered_extensions) |
| { |
| registered_extensions = TRUE; |
| |
| #ifdef G_OS_UNIX |
| ep = g_io_extension_point_register (G_DESKTOP_APP_INFO_LOOKUP_EXTENSION_POINT_NAME); |
| g_io_extension_point_set_required_type (ep, G_TYPE_DESKTOP_APP_INFO_LOOKUP); |
| #endif |
| |
| ep = g_io_extension_point_register (G_LOCAL_DIRECTORY_MONITOR_EXTENSION_POINT_NAME); |
| g_io_extension_point_set_required_type (ep, G_TYPE_LOCAL_DIRECTORY_MONITOR); |
| |
| ep = g_io_extension_point_register (G_LOCAL_FILE_MONITOR_EXTENSION_POINT_NAME); |
| g_io_extension_point_set_required_type (ep, G_TYPE_LOCAL_FILE_MONITOR); |
| |
| ep = g_io_extension_point_register (G_VOLUME_MONITOR_EXTENSION_POINT_NAME); |
| g_io_extension_point_set_required_type (ep, G_TYPE_VOLUME_MONITOR); |
| |
| ep = g_io_extension_point_register (G_NATIVE_VOLUME_MONITOR_EXTENSION_POINT_NAME); |
| g_io_extension_point_set_required_type (ep, G_TYPE_NATIVE_VOLUME_MONITOR); |
| |
| ep = g_io_extension_point_register (G_VFS_EXTENSION_POINT_NAME); |
| g_io_extension_point_set_required_type (ep, G_TYPE_VFS); |
| |
| ep = g_io_extension_point_register ("gsettings-backend"); |
| g_io_extension_point_set_required_type (ep, G_TYPE_OBJECT); |
| } |
| |
| G_UNLOCK (registered_extensions); |
| } |
| |
| void |
| _g_io_modules_ensure_loaded (void) |
| { |
| static gboolean loaded_dirs = FALSE; |
| const char *module_path; |
| |
| _g_io_modules_ensure_extension_points_registered (); |
| |
| G_LOCK (loaded_dirs); |
| |
| if (!loaded_dirs) |
| { |
| loaded_dirs = TRUE; |
| |
| g_io_modules_scan_all_in_directory (GIO_MODULE_DIR); |
| |
| module_path = g_getenv ("GIO_EXTRA_MODULES"); |
| |
| if (module_path) |
| { |
| gchar **paths; |
| int i; |
| |
| paths = g_strsplit (module_path, ":", 0); |
| |
| for (i = 0; paths[i] != NULL; i++) |
| g_io_modules_scan_all_in_directory (paths[i]); |
| |
| g_strfreev (paths); |
| } |
| |
| /* Initialize types from built-in "modules" */ |
| g_memory_settings_backend_get_type (); |
| #if defined(HAVE_SYS_INOTIFY_H) || defined(HAVE_LINUX_INOTIFY_H) |
| _g_inotify_directory_monitor_get_type (); |
| _g_inotify_file_monitor_get_type (); |
| #endif |
| #if defined(HAVE_FEN) |
| _g_fen_directory_monitor_get_type (); |
| _g_fen_file_monitor_get_type (); |
| #endif |
| #ifdef G_OS_WIN32 |
| _g_win32_volume_monitor_get_type (); |
| g_win32_directory_monitor_get_type (); |
| #endif |
| #ifdef G_OS_UNIX |
| _g_unix_volume_monitor_get_type (); |
| #endif |
| #ifdef G_OS_WIN32 |
| _g_winhttp_vfs_get_type (); |
| #endif |
| _g_local_vfs_get_type (); |
| } |
| |
| G_UNLOCK (loaded_dirs); |
| } |
| |
| static void |
| g_io_extension_point_free (GIOExtensionPoint *ep) |
| { |
| g_free (ep->name); |
| g_free (ep); |
| } |
| |
| /** |
| * g_io_extension_point_register: |
| * @name: The name of the extension point |
| * |
| * Registers an extension point. |
| * |
| * Returns: the new #GIOExtensionPoint. This object is owned by GIO |
| * and should not be freed |
| */ |
| GIOExtensionPoint * |
| g_io_extension_point_register (const char *name) |
| { |
| GIOExtensionPoint *ep; |
| |
| G_LOCK (extension_points); |
| if (extension_points == NULL) |
| extension_points = g_hash_table_new_full (g_str_hash, |
| g_str_equal, |
| NULL, |
| (GDestroyNotify)g_io_extension_point_free); |
| |
| ep = g_hash_table_lookup (extension_points, name); |
| if (ep != NULL) |
| { |
| G_UNLOCK (extension_points); |
| return ep; |
| } |
| |
| ep = g_new0 (GIOExtensionPoint, 1); |
| ep->name = g_strdup (name); |
| |
| g_hash_table_insert (extension_points, ep->name, ep); |
| |
| G_UNLOCK (extension_points); |
| |
| return ep; |
| } |
| |
| /** |
| * g_io_extension_point_lookup: |
| * @name: the name of the extension point |
| * |
| * Looks up an existing extension point. |
| * |
| * Returns: the #GIOExtensionPoint, or %NULL if there is no |
| * registered extension point with the given name |
| */ |
| GIOExtensionPoint * |
| g_io_extension_point_lookup (const char *name) |
| { |
| GIOExtensionPoint *ep; |
| |
| G_LOCK (extension_points); |
| ep = NULL; |
| if (extension_points != NULL) |
| ep = g_hash_table_lookup (extension_points, name); |
| |
| G_UNLOCK (extension_points); |
| |
| return ep; |
| |
| } |
| |
| /** |
| * g_io_extension_point_set_required_type: |
| * @extension_point: a #GIOExtensionPoint |
| * @type: the #GType to require |
| * |
| * Sets the required type for @extension_point to @type. |
| * All implementations must henceforth have this type. |
| */ |
| void |
| g_io_extension_point_set_required_type (GIOExtensionPoint *extension_point, |
| GType type) |
| { |
| extension_point->required_type = type; |
| } |
| |
| /** |
| * g_io_extension_point_get_required_type: |
| * @extension_point: a #GIOExtensionPoint |
| * |
| * Gets the required type for @extension_point. |
| * |
| * Returns: the #GType that all implementations must have, |
| * or #G_TYPE_INVALID if the extension point has no required type |
| */ |
| GType |
| g_io_extension_point_get_required_type (GIOExtensionPoint *extension_point) |
| { |
| return extension_point->required_type; |
| } |
| |
| void |
| lazy_load_modules (GIOExtensionPoint *extension_point) |
| { |
| GIOModule *module; |
| GList *l; |
| |
| for (l = extension_point->lazy_load_modules; l != NULL; l = l->next) |
| { |
| module = l->data; |
| |
| if (!module->initialized) |
| { |
| if (g_type_module_use (G_TYPE_MODULE (module))) |
| g_type_module_unuse (G_TYPE_MODULE (module)); /* Unload */ |
| else |
| g_printerr ("Failed to load module: %s\n", |
| module->filename); |
| } |
| } |
| } |
| |
| /** |
| * g_io_extension_point_get_extensions: |
| * @extension_point: a #GIOExtensionPoint |
| * |
| * Gets a list of all extensions that implement this extension point. |
| * The list is sorted by priority, beginning with the highest priority. |
| * |
| * Returns: (element-type GIOExtension) (transfer none): a #GList of |
| * #GIOExtension<!-- -->s. The list is owned by GIO and should not be |
| * modified. |
| */ |
| GList * |
| g_io_extension_point_get_extensions (GIOExtensionPoint *extension_point) |
| { |
| lazy_load_modules (extension_point); |
| return extension_point->extensions; |
| } |
| |
| /** |
| * g_io_extension_point_get_extension_by_name: |
| * @extension_point: a #GIOExtensionPoint |
| * @name: the name of the extension to get |
| * |
| * Finds a #GIOExtension for an extension point by name. |
| * |
| * Returns: the #GIOExtension for @extension_point that has the |
| * given name, or %NULL if there is no extension with that name |
| */ |
| GIOExtension * |
| g_io_extension_point_get_extension_by_name (GIOExtensionPoint *extension_point, |
| const char *name) |
| { |
| GList *l; |
| |
| lazy_load_modules (extension_point); |
| for (l = extension_point->extensions; l != NULL; l = l->next) |
| { |
| GIOExtension *e = l->data; |
| |
| if (e->name != NULL && |
| strcmp (e->name, name) == 0) |
| return e; |
| } |
| |
| return NULL; |
| } |
| |
| static gint |
| extension_prio_compare (gconstpointer a, |
| gconstpointer b) |
| { |
| const GIOExtension *extension_a = a, *extension_b = b; |
| |
| return extension_b->priority - extension_a->priority; |
| } |
| |
| /** |
| * g_io_extension_point_implement: |
| * @extension_point_name: the name of the extension point |
| * @type: the #GType to register as extension |
| * @extension_name: the name for the extension |
| * @priority: the priority for the extension |
| * |
| * Registers @type as extension for the extension point with name |
| * @extension_point_name. |
| * |
| * If @type has already been registered as an extension for this |
| * extension point, the existing #GIOExtension object is returned. |
| * |
| * Returns: a #GIOExtension object for #GType |
| */ |
| GIOExtension * |
| g_io_extension_point_implement (const char *extension_point_name, |
| GType type, |
| const char *extension_name, |
| gint priority) |
| { |
| GIOExtensionPoint *extension_point; |
| GIOExtension *extension; |
| GList *l; |
| |
| g_return_val_if_fail (extension_point_name != NULL, NULL); |
| |
| extension_point = g_io_extension_point_lookup (extension_point_name); |
| if (extension_point == NULL) |
| { |
| g_warning ("Tried to implement non-registered extension point %s", extension_point_name); |
| return NULL; |
| } |
| |
| if (extension_point->required_type != 0 && |
| !g_type_is_a (type, extension_point->required_type)) |
| { |
| g_warning ("Tried to register an extension of the type %s to extension point %s. " |
| "Expected type is %s.", |
| g_type_name (type), |
| extension_point_name, |
| g_type_name (extension_point->required_type)); |
| return NULL; |
| } |
| |
| /* It's safe to register the same type multiple times */ |
| for (l = extension_point->extensions; l != NULL; l = l->next) |
| { |
| extension = l->data; |
| if (extension->type == type) |
| return extension; |
| } |
| |
| extension = g_slice_new0 (GIOExtension); |
| extension->type = type; |
| extension->name = g_strdup (extension_name); |
| extension->priority = priority; |
| |
| extension_point->extensions = g_list_insert_sorted (extension_point->extensions, |
| extension, extension_prio_compare); |
| |
| return extension; |
| } |
| |
| /** |
| * g_io_extension_ref_class: |
| * @extension: a #GIOExtension |
| * |
| * Gets a reference to the class for the type that is |
| * associated with @extension. |
| * |
| * Returns: the #GTypeClass for the type of @extension |
| */ |
| GTypeClass * |
| g_io_extension_ref_class (GIOExtension *extension) |
| { |
| return g_type_class_ref (extension->type); |
| } |
| |
| /** |
| * g_io_extension_get_type: |
| * @extension: a #GIOExtension |
| * |
| * Gets the type associated with @extension. |
| * |
| * Returns: the type of @extension |
| */ |
| GType |
| g_io_extension_get_type (GIOExtension *extension) |
| { |
| return extension->type; |
| } |
| |
| /** |
| * g_io_extension_get_name: |
| * @extension: a #GIOExtension |
| * |
| * Gets the name under which @extension was registered. |
| * |
| * Note that the same type may be registered as extension |
| * for multiple extension points, under different names. |
| * |
| * Returns: the name of @extension. |
| */ |
| const char * |
| g_io_extension_get_name (GIOExtension *extension) |
| { |
| return extension->name; |
| } |
| |
| /** |
| * g_io_extension_get_priority: |
| * @extension: a #GIOExtension |
| * |
| * Gets the priority with which @extension was registered. |
| * |
| * Returns: the priority of @extension |
| */ |
| gint |
| g_io_extension_get_priority (GIOExtension *extension) |
| { |
| return extension->priority; |
| } |