| /* GDBus - GLib D-Bus Library | |
| * | |
| * Copyright (C) 2008-2010 Red Hat, Inc. | |
| * | |
| * SPDX-License-Identifier: LGPL-2.1-or-later | |
| * | |
| * 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 2.1 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, see <http://www.gnu.org/licenses/>. | |
| * | |
| * Author: David Zeuthen <davidz@redhat.com> | |
| */ | |
| #include "config.h" | |
| #include <stdlib.h> | |
| #include <string.h> | |
| #include "gdbusutils.h" | |
| #include "gdbusnamewatching.h" | |
| #include "gdbuserror.h" | |
| #include "gdbusprivate.h" | |
| #include "gdbusconnection.h" | |
| #include "glibintl.h" | |
| G_LOCK_DEFINE_STATIC (lock); | |
| /* ---------------------------------------------------------------------------------------------------- */ | |
| typedef enum | |
| { | |
| PREVIOUS_CALL_NONE = 0, | |
| PREVIOUS_CALL_APPEARED, | |
| PREVIOUS_CALL_VANISHED, | |
| } PreviousCall; | |
| typedef struct | |
| { | |
| gint ref_count; /* (atomic) */ | |
| guint id; | |
| gchar *name; | |
| GBusNameWatcherFlags flags; | |
| gchar *name_owner; | |
| GBusNameAppearedCallback name_appeared_handler; | |
| GBusNameVanishedCallback name_vanished_handler; | |
| gpointer user_data; | |
| GDestroyNotify user_data_free_func; | |
| GMainContext *main_context; | |
| GDBusConnection *connection; | |
| gulong disconnected_signal_handler_id; | |
| guint name_owner_changed_subscription_id; | |
| PreviousCall previous_call; | |
| gboolean cancelled; | |
| gboolean initialized; | |
| } Client; | |
| /* Must be accessed atomically. */ | |
| static guint next_global_id = 1; /* (atomic) */ | |
| /* Must be accessed with @lock held. */ | |
| static GHashTable *map_id_to_client = NULL; | |
| static Client * | |
| client_ref (Client *client) | |
| { | |
| g_atomic_int_inc (&client->ref_count); | |
| return client; | |
| } | |
| static gboolean | |
| free_user_data_cb (gpointer user_data) | |
| { | |
| /* The user data is actually freed by the GDestroyNotify for the idle source */ | |
| return G_SOURCE_REMOVE; | |
| } | |
| static void | |
| client_unref (Client *client) | |
| { | |
| if (g_atomic_int_dec_and_test (&client->ref_count)) | |
| { | |
| if (client->connection != NULL) | |
| { | |
| if (client->name_owner_changed_subscription_id > 0) | |
| g_dbus_connection_signal_unsubscribe (client->connection, client->name_owner_changed_subscription_id); | |
| if (client->disconnected_signal_handler_id > 0) | |
| g_signal_handler_disconnect (client->connection, client->disconnected_signal_handler_id); | |
| g_object_unref (client->connection); | |
| } | |
| g_free (client->name); | |
| g_free (client->name_owner); | |
| if (client->user_data_free_func != NULL) | |
| { | |
| /* Ensure client->user_data_free_func() is called from the right thread */ | |
| if (client->main_context != g_main_context_get_thread_default ()) | |
| { | |
| GSource *idle_source = g_idle_source_new (); | |
| g_source_set_callback (idle_source, free_user_data_cb, | |
| client->user_data, | |
| client->user_data_free_func); | |
| g_source_set_name (idle_source, "[gio, gdbusnamewatching.c] free_user_data_cb"); | |
| g_source_attach (idle_source, client->main_context); | |
| g_source_unref (idle_source); | |
| } | |
| else | |
| client->user_data_free_func (client->user_data); | |
| } | |
| g_main_context_unref (client->main_context); | |
| g_free (client); | |
| } | |
| } | |
| /* ---------------------------------------------------------------------------------------------------- */ | |
| typedef enum | |
| { | |
| CALL_TYPE_NAME_APPEARED, | |
| CALL_TYPE_NAME_VANISHED | |
| } CallType; | |
| typedef struct | |
| { | |
| Client *client; | |
| /* keep this separate because client->connection may | |
| * be set to NULL after scheduling the call | |
| */ | |
| GDBusConnection *connection; | |
| /* ditto */ | |
| gchar *name_owner; | |
| CallType call_type; | |
| } CallHandlerData; | |
| static void | |
| call_handler_data_free (CallHandlerData *data) | |
| { | |
| if (data->connection != NULL) | |
| g_object_unref (data->connection); | |
| g_free (data->name_owner); | |
| client_unref (data->client); | |
| g_free (data); | |
| } | |
| static void | |
| actually_do_call (Client *client, GDBusConnection *connection, const gchar *name_owner, CallType call_type) | |
| { | |
| /* The client might have been cancelled (g_bus_unwatch_name()) while we were | |
| * sitting in the #GMainContext dispatch queue. */ | |
| if (client->cancelled) | |
| return; | |
| switch (call_type) | |
| { | |
| case CALL_TYPE_NAME_APPEARED: | |
| if (client->name_appeared_handler != NULL) | |
| { | |
| client->name_appeared_handler (connection, | |
| client->name, | |
| name_owner, | |
| client->user_data); | |
| } | |
| break; | |
| case CALL_TYPE_NAME_VANISHED: | |
| if (client->name_vanished_handler != NULL) | |
| { | |
| client->name_vanished_handler (connection, | |
| client->name, | |
| client->user_data); | |
| } | |
| break; | |
| default: | |
| g_assert_not_reached (); | |
| break; | |
| } | |
| } | |
| static gboolean | |
| call_in_idle_cb (gpointer _data) | |
| { | |
| CallHandlerData *data = _data; | |
| actually_do_call (data->client, data->connection, data->name_owner, data->call_type); | |
| return FALSE; | |
| } | |
| static void | |
| schedule_call_in_idle (Client *client, CallType call_type) | |
| { | |
| CallHandlerData *data; | |
| GSource *idle_source; | |
| data = g_new0 (CallHandlerData, 1); | |
| data->client = client_ref (client); | |
| data->connection = client->connection != NULL ? g_object_ref (client->connection) : NULL; | |
| data->name_owner = g_strdup (client->name_owner); | |
| data->call_type = call_type; | |
| idle_source = g_idle_source_new (); | |
| g_source_set_priority (idle_source, G_PRIORITY_HIGH); | |
| g_source_set_callback (idle_source, | |
| call_in_idle_cb, | |
| data, | |
| (GDestroyNotify) call_handler_data_free); | |
| g_source_set_static_name (idle_source, "[gio, gdbusnamewatching.c] call_in_idle_cb"); | |
| g_source_attach (idle_source, client->main_context); | |
| g_source_unref (idle_source); | |
| } | |
| static void | |
| do_call (Client *client, CallType call_type) | |
| { | |
| GMainContext *current_context; | |
| /* only schedule in idle if we're not in the right thread */ | |
| current_context = g_main_context_ref_thread_default (); | |
| if (current_context != client->main_context) | |
| schedule_call_in_idle (client, call_type); | |
| else | |
| actually_do_call (client, client->connection, client->name_owner, call_type); | |
| g_main_context_unref (current_context); | |
| } | |
| static void | |
| call_appeared_handler (Client *client) | |
| { | |
| if (client->previous_call != PREVIOUS_CALL_APPEARED) | |
| { | |
| client->previous_call = PREVIOUS_CALL_APPEARED; | |
| if (!client->cancelled && client->name_appeared_handler != NULL) | |
| { | |
| do_call (client, CALL_TYPE_NAME_APPEARED); | |
| } | |
| } | |
| } | |
| static void | |
| call_vanished_handler (Client *client) | |
| { | |
| if (client->previous_call != PREVIOUS_CALL_VANISHED) | |
| { | |
| client->previous_call = PREVIOUS_CALL_VANISHED; | |
| if (!client->cancelled && client->name_vanished_handler != NULL) | |
| { | |
| do_call (client, CALL_TYPE_NAME_VANISHED); | |
| } | |
| } | |
| } | |
| /* ---------------------------------------------------------------------------------------------------- */ | |
| /* Return a reference to the #Client for @watcher_id, or %NULL if it’s been | |
| * unwatched. This is safe to call from any thread. */ | |
| static Client * | |
| dup_client (guint watcher_id) | |
| { | |
| Client *client; | |
| G_LOCK (lock); | |
| g_assert (watcher_id != 0); | |
| g_assert (map_id_to_client != NULL); | |
| client = g_hash_table_lookup (map_id_to_client, GUINT_TO_POINTER (watcher_id)); | |
| if (client != NULL) | |
| client_ref (client); | |
| G_UNLOCK (lock); | |
| return client; | |
| } | |
| /* Could be called from any thread, so it could be called after client_unref() | |
| * has started finalising the #Client. Avoid that by looking up the #Client | |
| * atomically. */ | |
| static void | |
| on_connection_disconnected (GDBusConnection *connection, | |
| gboolean remote_peer_vanished, | |
| GError *error, | |
| gpointer user_data) | |
| { | |
| guint watcher_id = GPOINTER_TO_UINT (user_data); | |
| Client *client = NULL; | |
| client = dup_client (watcher_id); | |
| if (client == NULL) | |
| return; | |
| if (client->name_owner_changed_subscription_id > 0) | |
| g_dbus_connection_signal_unsubscribe (client->connection, client->name_owner_changed_subscription_id); | |
| if (client->disconnected_signal_handler_id > 0) | |
| g_signal_handler_disconnect (client->connection, client->disconnected_signal_handler_id); | |
| g_object_unref (client->connection); | |
| client->disconnected_signal_handler_id = 0; | |
| client->name_owner_changed_subscription_id = 0; | |
| client->connection = NULL; | |
| call_vanished_handler (client); | |
| client_unref (client); | |
| } | |
| /* ---------------------------------------------------------------------------------------------------- */ | |
| /* Will always be called from the thread which acquired client->main_context. */ | |
| static void | |
| on_name_owner_changed (GDBusConnection *connection, | |
| const gchar *sender_name, | |
| const gchar *object_path, | |
| const gchar *interface_name, | |
| const gchar *signal_name, | |
| GVariant *parameters, | |
| gpointer user_data) | |
| { | |
| guint watcher_id = GPOINTER_TO_UINT (user_data); | |
| Client *client = NULL; | |
| const gchar *name; | |
| const gchar *old_owner; | |
| const gchar *new_owner; | |
| client = dup_client (watcher_id); | |
| if (client == NULL) | |
| return; | |
| if (!client->initialized) | |
| goto out; | |
| if (g_strcmp0 (object_path, DBUS_PATH_DBUS) != 0 || | |
| g_strcmp0 (interface_name, DBUS_INTERFACE_DBUS) != 0 || | |
| g_strcmp0 (sender_name, DBUS_SERVICE_DBUS) != 0) | |
| goto out; | |
| g_variant_get (parameters, | |
| "(&s&s&s)", | |
| &name, | |
| &old_owner, | |
| &new_owner); | |
| /* we only care about a specific name */ | |
| if (g_strcmp0 (name, client->name) != 0) | |
| goto out; | |
| if ((old_owner != NULL && strlen (old_owner) > 0) && client->name_owner != NULL) | |
| { | |
| g_free (client->name_owner); | |
| client->name_owner = NULL; | |
| call_vanished_handler (client); | |
| } | |
| if (new_owner != NULL && strlen (new_owner) > 0) | |
| { | |
| g_warn_if_fail (client->name_owner == NULL); | |
| g_free (client->name_owner); | |
| client->name_owner = g_strdup (new_owner); | |
| call_appeared_handler (client); | |
| } | |
| out: | |
| client_unref (client); | |
| } | |
| /* ---------------------------------------------------------------------------------------------------- */ | |
| static void | |
| get_name_owner_cb (GObject *source_object, | |
| GAsyncResult *res, | |
| gpointer user_data) | |
| { | |
| Client *client = user_data; | |
| GVariant *result; | |
| const char *name_owner; | |
| name_owner = NULL; | |
| result = NULL; | |
| result = g_dbus_connection_call_finish (client->connection, | |
| res, | |
| NULL); | |
| if (result != NULL) | |
| { | |
| g_variant_get (result, "(&s)", &name_owner); | |
| } | |
| if (name_owner != NULL) | |
| { | |
| g_warn_if_fail (client->name_owner == NULL); | |
| client->name_owner = g_strdup (name_owner); | |
| call_appeared_handler (client); | |
| } | |
| else | |
| { | |
| call_vanished_handler (client); | |
| } | |
| client->initialized = TRUE; | |
| if (result != NULL) | |
| g_variant_unref (result); | |
| client_unref (client); | |
| } | |
| /* ---------------------------------------------------------------------------------------------------- */ | |
| static void | |
| invoke_get_name_owner (Client *client) | |
| { | |
| g_dbus_connection_call (client->connection, | |
| DBUS_SERVICE_DBUS, | |
| DBUS_PATH_DBUS, | |
| DBUS_INTERFACE_DBUS, | |
| "GetNameOwner", /* method name */ | |
| g_variant_new ("(s)", client->name), | |
| G_VARIANT_TYPE ("(s)"), | |
| G_DBUS_CALL_FLAGS_NONE, | |
| -1, | |
| NULL, | |
| (GAsyncReadyCallback) get_name_owner_cb, | |
| client_ref (client)); | |
| } | |
| /* ---------------------------------------------------------------------------------------------------- */ | |
| static void | |
| start_service_by_name_cb (GObject *source_object, | |
| GAsyncResult *res, | |
| gpointer user_data) | |
| { | |
| Client *client = user_data; | |
| GVariant *result; | |
| result = NULL; | |
| result = g_dbus_connection_call_finish (client->connection, | |
| res, | |
| NULL); | |
| if (result != NULL) | |
| { | |
| guint32 start_service_result; | |
| g_variant_get (result, "(u)", &start_service_result); | |
| if (start_service_result == DBUS_START_REPLY_SUCCESS) | |
| { | |
| invoke_get_name_owner (client); | |
| } | |
| else if (start_service_result == DBUS_START_REPLY_ALREADY_RUNNING) | |
| { | |
| invoke_get_name_owner (client); | |
| } | |
| else | |
| { | |
| g_warning ("Unexpected reply %d from StartServiceByName() method", start_service_result); | |
| call_vanished_handler (client); | |
| client->initialized = TRUE; | |
| } | |
| } | |
| else | |
| { | |
| /* Errors are not unexpected; the bus will reply e.g. | |
| * | |
| * org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.Epiphany2 | |
| * was not provided by any .service files | |
| * | |
| * This doesn't mean that the name doesn't have an owner, just | |
| * that it's not provided by a .service file. So proceed to | |
| * invoke GetNameOwner(). | |
| */ | |
| invoke_get_name_owner (client); | |
| } | |
| if (result != NULL) | |
| g_variant_unref (result); | |
| client_unref (client); | |
| } | |
| /* ---------------------------------------------------------------------------------------------------- */ | |
| static void | |
| has_connection (Client *client) | |
| { | |
| /* listen for disconnection */ | |
| client->disconnected_signal_handler_id = g_signal_connect (client->connection, | |
| "closed", | |
| G_CALLBACK (on_connection_disconnected), | |
| GUINT_TO_POINTER (client->id)); | |
| /* start listening to NameOwnerChanged messages immediately */ | |
| client->name_owner_changed_subscription_id = g_dbus_connection_signal_subscribe (client->connection, | |
| DBUS_SERVICE_DBUS, | |
| DBUS_INTERFACE_DBUS, | |
| "NameOwnerChanged", /* signal */ | |
| DBUS_PATH_DBUS, | |
| client->name, | |
| G_DBUS_SIGNAL_FLAGS_NONE, | |
| on_name_owner_changed, | |
| GUINT_TO_POINTER (client->id), | |
| NULL); | |
| if (client->flags & G_BUS_NAME_WATCHER_FLAGS_AUTO_START) | |
| { | |
| g_dbus_connection_call (client->connection, | |
| DBUS_SERVICE_DBUS, | |
| DBUS_PATH_DBUS, | |
| DBUS_INTERFACE_DBUS, | |
| "StartServiceByName", /* method name */ | |
| g_variant_new ("(su)", client->name, 0), | |
| G_VARIANT_TYPE ("(u)"), | |
| G_DBUS_CALL_FLAGS_NONE, | |
| -1, | |
| NULL, | |
| (GAsyncReadyCallback) start_service_by_name_cb, | |
| client_ref (client)); | |
| } | |
| else | |
| { | |
| /* check owner */ | |
| invoke_get_name_owner (client); | |
| } | |
| } | |
| static void | |
| connection_get_cb (GObject *source_object, | |
| GAsyncResult *res, | |
| gpointer user_data) | |
| { | |
| Client *client = user_data; | |
| client->connection = g_bus_get_finish (res, NULL); | |
| if (client->connection == NULL) | |
| { | |
| call_vanished_handler (client); | |
| goto out; | |
| } | |
| has_connection (client); | |
| out: | |
| client_unref (client); | |
| } | |
| /* ---------------------------------------------------------------------------------------------------- */ | |
| /** | |
| * g_bus_watch_name: | |
| * @bus_type: The type of bus to watch a name on. | |
| * @name: The name (well-known or unique) to watch. | |
| * @flags: Flags from the #GBusNameWatcherFlags enumeration. | |
| * @name_appeared_handler: (nullable) (scope notified): Handler to invoke when | |
| * @name is known to exist or %NULL. | |
| * @name_vanished_handler: (nullable) (scope notified): Handler to invoke when | |
| * @name is known to not exist or %NULL. | |
| * @user_data: User data to pass to handlers. | |
| * @user_data_free_func: (nullable): Function for freeing @user_data or %NULL. | |
| * | |
| * Starts watching @name on the bus specified by @bus_type and calls | |
| * @name_appeared_handler and @name_vanished_handler when the name is | |
| * known to have an owner respectively known to lose its | |
| * owner. Callbacks will be invoked in the | |
| * [thread-default main context][g-main-context-push-thread-default] | |
| * of the thread you are calling this function from. | |
| * | |
| * You are guaranteed that one of the handlers will be invoked after | |
| * calling this function. When you are done watching the name, just | |
| * call g_bus_unwatch_name() with the watcher id this function | |
| * returns. | |
| * | |
| * If the name vanishes or appears (for example the application owning | |
| * the name could restart), the handlers are also invoked. If the | |
| * #GDBusConnection that is used for watching the name disconnects, then | |
| * @name_vanished_handler is invoked since it is no longer | |
| * possible to access the name. | |
| * | |
| * Another guarantee is that invocations of @name_appeared_handler | |
| * and @name_vanished_handler are guaranteed to alternate; that | |
| * is, if @name_appeared_handler is invoked then you are | |
| * guaranteed that the next time one of the handlers is invoked, it | |
| * will be @name_vanished_handler. The reverse is also true. | |
| * | |
| * This behavior makes it very simple to write applications that want | |
| * to take action when a certain [name exists][gdbus-watching-names]. | |
| * Basically, the application should create object proxies in | |
| * @name_appeared_handler and destroy them again (if any) in | |
| * @name_vanished_handler. | |
| * | |
| * Returns: An identifier (never 0) that can be used with | |
| * g_bus_unwatch_name() to stop watching the name. | |
| * | |
| * Since: 2.26 | |
| */ | |
| guint | |
| g_bus_watch_name (GBusType bus_type, | |
| const gchar *name, | |
| GBusNameWatcherFlags flags, | |
| GBusNameAppearedCallback name_appeared_handler, | |
| GBusNameVanishedCallback name_vanished_handler, | |
| gpointer user_data, | |
| GDestroyNotify user_data_free_func) | |
| { | |
| Client *client; | |
| g_return_val_if_fail (g_dbus_is_name (name), 0); | |
| G_LOCK (lock); | |
| client = g_new0 (Client, 1); | |
| client->ref_count = 1; | |
| client->id = (guint) g_atomic_int_add (&next_global_id, 1); /* TODO: uh oh, handle overflow */ | |
| client->name = g_strdup (name); | |
| client->flags = flags; | |
| client->name_appeared_handler = name_appeared_handler; | |
| client->name_vanished_handler = name_vanished_handler; | |
| client->user_data = user_data; | |
| client->user_data_free_func = user_data_free_func; | |
| client->main_context = g_main_context_ref_thread_default (); | |
| if (map_id_to_client == NULL) | |
| { | |
| map_id_to_client = g_hash_table_new (g_direct_hash, g_direct_equal); | |
| } | |
| g_hash_table_insert (map_id_to_client, | |
| GUINT_TO_POINTER (client->id), | |
| client); | |
| g_bus_get (bus_type, | |
| NULL, | |
| connection_get_cb, | |
| client_ref (client)); | |
| G_UNLOCK (lock); | |
| return client->id; | |
| } | |
| /** | |
| * g_bus_watch_name_on_connection: | |
| * @connection: A #GDBusConnection. | |
| * @name: The name (well-known or unique) to watch. | |
| * @flags: Flags from the #GBusNameWatcherFlags enumeration. | |
| * @name_appeared_handler: (nullable) (scope notified): Handler to invoke when | |
| * @name is known to exist or %NULL. | |
| * @name_vanished_handler: (nullable) (scope notified): Handler to invoke when | |
| * @name is known to not exist or %NULL. | |
| * @user_data: User data to pass to handlers. | |
| * @user_data_free_func: (nullable): Function for freeing @user_data or %NULL. | |
| * | |
| * Like g_bus_watch_name() but takes a #GDBusConnection instead of a | |
| * #GBusType. | |
| * | |
| * Returns: An identifier (never 0) that can be used with | |
| * g_bus_unwatch_name() to stop watching the name. | |
| * | |
| * Since: 2.26 | |
| */ | |
| guint g_bus_watch_name_on_connection (GDBusConnection *connection, | |
| const gchar *name, | |
| GBusNameWatcherFlags flags, | |
| GBusNameAppearedCallback name_appeared_handler, | |
| GBusNameVanishedCallback name_vanished_handler, | |
| gpointer user_data, | |
| GDestroyNotify user_data_free_func) | |
| { | |
| Client *client; | |
| g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), 0); | |
| g_return_val_if_fail (g_dbus_is_name (name), 0); | |
| G_LOCK (lock); | |
| client = g_new0 (Client, 1); | |
| client->ref_count = 1; | |
| client->id = (guint) g_atomic_int_add (&next_global_id, 1); /* TODO: uh oh, handle overflow */ | |
| client->name = g_strdup (name); | |
| client->flags = flags; | |
| client->name_appeared_handler = name_appeared_handler; | |
| client->name_vanished_handler = name_vanished_handler; | |
| client->user_data = user_data; | |
| client->user_data_free_func = user_data_free_func; | |
| client->main_context = g_main_context_ref_thread_default (); | |
| if (map_id_to_client == NULL) | |
| map_id_to_client = g_hash_table_new (g_direct_hash, g_direct_equal); | |
| g_hash_table_insert (map_id_to_client, | |
| GUINT_TO_POINTER (client->id), | |
| client); | |
| client->connection = g_object_ref (connection); | |
| G_UNLOCK (lock); | |
| has_connection (client); | |
| return client->id; | |
| } | |
| typedef struct { | |
| GClosure *name_appeared_closure; | |
| GClosure *name_vanished_closure; | |
| } WatchNameData; | |
| static WatchNameData * | |
| watch_name_data_new (GClosure *name_appeared_closure, | |
| GClosure *name_vanished_closure) | |
| { | |
| WatchNameData *data; | |
| data = g_new0 (WatchNameData, 1); | |
| if (name_appeared_closure != NULL) | |
| { | |
| data->name_appeared_closure = g_closure_ref (name_appeared_closure); | |
| g_closure_sink (name_appeared_closure); | |
| if (G_CLOSURE_NEEDS_MARSHAL (name_appeared_closure)) | |
| g_closure_set_marshal (name_appeared_closure, g_cclosure_marshal_generic); | |
| } | |
| if (name_vanished_closure != NULL) | |
| { | |
| data->name_vanished_closure = g_closure_ref (name_vanished_closure); | |
| g_closure_sink (name_vanished_closure); | |
| if (G_CLOSURE_NEEDS_MARSHAL (name_vanished_closure)) | |
| g_closure_set_marshal (name_vanished_closure, g_cclosure_marshal_generic); | |
| } | |
| return data; | |
| } | |
| static void | |
| watch_with_closures_on_name_appeared (GDBusConnection *connection, | |
| const gchar *name, | |
| const gchar *name_owner, | |
| gpointer user_data) | |
| { | |
| WatchNameData *data = user_data; | |
| GValue params[3] = { G_VALUE_INIT, G_VALUE_INIT, G_VALUE_INIT }; | |
| g_value_init (¶ms[0], G_TYPE_DBUS_CONNECTION); | |
| g_value_set_object (¶ms[0], connection); | |
| g_value_init (¶ms[1], G_TYPE_STRING); | |
| g_value_set_string (¶ms[1], name); | |
| g_value_init (¶ms[2], G_TYPE_STRING); | |
| g_value_set_string (¶ms[2], name_owner); | |
| g_closure_invoke (data->name_appeared_closure, NULL, 3, params, NULL); | |
| g_value_unset (params + 0); | |
| g_value_unset (params + 1); | |
| g_value_unset (params + 2); | |
| } | |
| static void | |
| watch_with_closures_on_name_vanished (GDBusConnection *connection, | |
| const gchar *name, | |
| gpointer user_data) | |
| { | |
| WatchNameData *data = user_data; | |
| GValue params[2] = { G_VALUE_INIT, G_VALUE_INIT }; | |
| g_value_init (¶ms[0], G_TYPE_DBUS_CONNECTION); | |
| g_value_set_object (¶ms[0], connection); | |
| g_value_init (¶ms[1], G_TYPE_STRING); | |
| g_value_set_string (¶ms[1], name); | |
| g_closure_invoke (data->name_vanished_closure, NULL, 2, params, NULL); | |
| g_value_unset (params + 0); | |
| g_value_unset (params + 1); | |
| } | |
| static void | |
| bus_watch_name_free_func (gpointer user_data) | |
| { | |
| WatchNameData *data = user_data; | |
| if (data->name_appeared_closure != NULL) | |
| g_closure_unref (data->name_appeared_closure); | |
| if (data->name_vanished_closure != NULL) | |
| g_closure_unref (data->name_vanished_closure); | |
| g_free (data); | |
| } | |
| /** | |
| * g_bus_watch_name_with_closures: (rename-to g_bus_watch_name) | |
| * @bus_type: The type of bus to watch a name on. | |
| * @name: The name (well-known or unique) to watch. | |
| * @flags: Flags from the #GBusNameWatcherFlags enumeration. | |
| * @name_appeared_closure: (nullable): #GClosure to invoke when @name is known | |
| * to exist or %NULL. | |
| * @name_vanished_closure: (nullable): #GClosure to invoke when @name is known | |
| * to not exist or %NULL. | |
| * | |
| * Version of g_bus_watch_name() using closures instead of callbacks for | |
| * easier binding in other languages. | |
| * | |
| * Returns: An identifier (never 0) that can be used with | |
| * g_bus_unwatch_name() to stop watching the name. | |
| * | |
| * Since: 2.26 | |
| */ | |
| guint | |
| g_bus_watch_name_with_closures (GBusType bus_type, | |
| const gchar *name, | |
| GBusNameWatcherFlags flags, | |
| GClosure *name_appeared_closure, | |
| GClosure *name_vanished_closure) | |
| { | |
| return g_bus_watch_name (bus_type, | |
| name, | |
| flags, | |
| name_appeared_closure != NULL ? watch_with_closures_on_name_appeared : NULL, | |
| name_vanished_closure != NULL ? watch_with_closures_on_name_vanished : NULL, | |
| watch_name_data_new (name_appeared_closure, name_vanished_closure), | |
| bus_watch_name_free_func); | |
| } | |
| /** | |
| * g_bus_watch_name_on_connection_with_closures: (rename-to g_bus_watch_name_on_connection) | |
| * @connection: A #GDBusConnection. | |
| * @name: The name (well-known or unique) to watch. | |
| * @flags: Flags from the #GBusNameWatcherFlags enumeration. | |
| * @name_appeared_closure: (nullable): #GClosure to invoke when @name is known | |
| * to exist or %NULL. | |
| * @name_vanished_closure: (nullable): #GClosure to invoke when @name is known | |
| * to not exist or %NULL. | |
| * | |
| * Version of g_bus_watch_name_on_connection() using closures instead of callbacks for | |
| * easier binding in other languages. | |
| * | |
| * Returns: An identifier (never 0) that can be used with | |
| * g_bus_unwatch_name() to stop watching the name. | |
| * | |
| * Since: 2.26 | |
| */ | |
| guint g_bus_watch_name_on_connection_with_closures ( | |
| GDBusConnection *connection, | |
| const gchar *name, | |
| GBusNameWatcherFlags flags, | |
| GClosure *name_appeared_closure, | |
| GClosure *name_vanished_closure) | |
| { | |
| return g_bus_watch_name_on_connection (connection, | |
| name, | |
| flags, | |
| name_appeared_closure != NULL ? watch_with_closures_on_name_appeared : NULL, | |
| name_vanished_closure != NULL ? watch_with_closures_on_name_vanished : NULL, | |
| watch_name_data_new (name_appeared_closure, name_vanished_closure), | |
| bus_watch_name_free_func); | |
| } | |
| /** | |
| * g_bus_unwatch_name: | |
| * @watcher_id: An identifier obtained from g_bus_watch_name() | |
| * | |
| * Stops watching a name. | |
| * | |
| * Note that there may still be D-Bus traffic to process (relating to watching | |
| * and unwatching the name) in the current thread-default #GMainContext after | |
| * this function has returned. You should continue to iterate the #GMainContext | |
| * until the #GDestroyNotify function passed to g_bus_watch_name() is called, in | |
| * order to avoid memory leaks through callbacks queued on the #GMainContext | |
| * after it’s stopped being iterated. | |
| * | |
| * Since: 2.26 | |
| */ | |
| void | |
| g_bus_unwatch_name (guint watcher_id) | |
| { | |
| Client *client; | |
| g_return_if_fail (watcher_id > 0); | |
| client = NULL; | |
| G_LOCK (lock); | |
| if (watcher_id == 0 || | |
| map_id_to_client == NULL || | |
| (client = g_hash_table_lookup (map_id_to_client, GUINT_TO_POINTER (watcher_id))) == NULL) | |
| { | |
| g_warning ("Invalid id %d passed to g_bus_unwatch_name()", watcher_id); | |
| goto out; | |
| } | |
| client->cancelled = TRUE; | |
| g_warn_if_fail (g_hash_table_remove (map_id_to_client, GUINT_TO_POINTER (watcher_id))); | |
| out: | |
| G_UNLOCK (lock); | |
| /* do callback without holding lock */ | |
| if (client != NULL) | |
| { | |
| client_unref (client); | |
| } | |
| } |