| /* GDBus - GLib D-Bus Library |
| * |
| * Copyright (C) 2008-2010 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 2.1 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" |
| |
| /** |
| * SECTION:gdbusnamewatching |
| * @title: Watching Bus Names |
| * @short_description: Simple API for watching bus names |
| * @include: gio/gio.h |
| * |
| * Convenience API for watching bus names. |
| * |
| * A simple example for watching a name can be found in |
| * [gdbus-example-watch-name.c](https://gitlab.gnome.org/GNOME/glib/-/blob/HEAD/gio/tests/gdbus-example-watch-name.c) |
| */ |
| |
| 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 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); |
| g_main_context_unref (client->main_context); |
| if (client->user_data_free_func != NULL) |
| client->user_data_free_func (client->user_data); |
| 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_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, "/org/freedesktop/DBus") != 0 || |
| g_strcmp0 (interface_name, "org.freedesktop.DBus") != 0 || |
| g_strcmp0 (sender_name, "org.freedesktop.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, |
| "org.freedesktop.DBus", /* bus name */ |
| "/org/freedesktop/DBus", /* object path */ |
| "org.freedesktop.DBus", /* interface name */ |
| "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 == 1) /* DBUS_START_REPLY_SUCCESS */ |
| { |
| invoke_get_name_owner (client); |
| } |
| else if (start_service_result == 2) /* 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, |
| "org.freedesktop.DBus", /* name */ |
| "org.freedesktop.DBus", /* if */ |
| "NameOwnerChanged", /* signal */ |
| "/org/freedesktop/DBus", /* path */ |
| 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, |
| "org.freedesktop.DBus", /* bus name */ |
| "/org/freedesktop/DBus", /* object path */ |
| "org.freedesktop.DBus", /* interface name */ |
| "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): Handler to invoke when @name is known to exist or %NULL. |
| * @name_vanished_handler: (nullable): 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): Handler to invoke when @name is known to exist or %NULL. |
| * @name_vanished_handler: (nullable): 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); |
| } |
| } |
