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924 lines
30 KiB
C
924 lines
30 KiB
C
/* GDBus - GLib D-Bus Library
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*
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* Copyright (C) 2008-2010 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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* Author: David Zeuthen <davidz@redhat.com>
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <string.h>
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#include "gdbusutils.h"
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#include "gdbusnamewatching.h"
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#include "gdbuserror.h"
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#include "gdbusprivate.h"
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#include "gdbusconnection.h"
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#include "glibintl.h"
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/**
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* SECTION:gdbusnamewatching
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* @title: Watching Bus Names
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* @short_description: Simple API for watching bus names
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* @include: gio/gio.h
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*
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* Convenience API for watching bus names.
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*
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* A simple example for watching a name can be found in
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* [gdbus-example-watch-name.c](https://gitlab.gnome.org/GNOME/glib/-/blob/HEAD/gio/tests/gdbus-example-watch-name.c)
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*/
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G_LOCK_DEFINE_STATIC (lock);
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/* ---------------------------------------------------------------------------------------------------- */
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typedef enum
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{
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PREVIOUS_CALL_NONE = 0,
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PREVIOUS_CALL_APPEARED,
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PREVIOUS_CALL_VANISHED,
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} PreviousCall;
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typedef struct
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{
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gint ref_count; /* (atomic) */
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guint id;
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gchar *name;
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GBusNameWatcherFlags flags;
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gchar *name_owner;
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GBusNameAppearedCallback name_appeared_handler;
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GBusNameVanishedCallback name_vanished_handler;
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gpointer user_data;
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GDestroyNotify user_data_free_func;
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GMainContext *main_context;
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GDBusConnection *connection;
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gulong disconnected_signal_handler_id;
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guint name_owner_changed_subscription_id;
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PreviousCall previous_call;
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gboolean cancelled;
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gboolean initialized;
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} Client;
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/* Must be accessed atomically. */
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static guint next_global_id = 1; /* (atomic) */
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/* Must be accessed with @lock held. */
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static GHashTable *map_id_to_client = NULL;
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static Client *
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client_ref (Client *client)
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{
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g_atomic_int_inc (&client->ref_count);
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return client;
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}
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static gboolean
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free_user_data_cb (gpointer user_data)
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{
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/* The user data is actually freed by the GDestroyNotify for the idle source */
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return G_SOURCE_REMOVE;
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}
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static void
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client_unref (Client *client)
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{
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if (g_atomic_int_dec_and_test (&client->ref_count))
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{
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if (client->connection != NULL)
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{
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if (client->name_owner_changed_subscription_id > 0)
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g_dbus_connection_signal_unsubscribe (client->connection, client->name_owner_changed_subscription_id);
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if (client->disconnected_signal_handler_id > 0)
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g_signal_handler_disconnect (client->connection, client->disconnected_signal_handler_id);
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g_object_unref (client->connection);
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}
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g_free (client->name);
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g_free (client->name_owner);
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if (client->user_data_free_func != NULL)
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{
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/* Ensure client->user_data_free_func() is called from the right thread */
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if (client->main_context != g_main_context_get_thread_default ())
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{
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GSource *idle_source = g_idle_source_new ();
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g_source_set_callback (idle_source, free_user_data_cb,
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client->user_data,
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client->user_data_free_func);
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g_source_set_name (idle_source, "[gio, gdbusnamewatching.c] free_user_data_cb");
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g_source_attach (idle_source, client->main_context);
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g_source_unref (idle_source);
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}
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else
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client->user_data_free_func (client->user_data);
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}
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g_main_context_unref (client->main_context);
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g_free (client);
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}
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}
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/* ---------------------------------------------------------------------------------------------------- */
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typedef enum
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{
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CALL_TYPE_NAME_APPEARED,
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CALL_TYPE_NAME_VANISHED
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} CallType;
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typedef struct
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{
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Client *client;
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/* keep this separate because client->connection may
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* be set to NULL after scheduling the call
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*/
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GDBusConnection *connection;
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/* ditto */
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gchar *name_owner;
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CallType call_type;
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} CallHandlerData;
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static void
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call_handler_data_free (CallHandlerData *data)
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{
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if (data->connection != NULL)
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g_object_unref (data->connection);
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g_free (data->name_owner);
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client_unref (data->client);
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g_free (data);
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}
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static void
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actually_do_call (Client *client, GDBusConnection *connection, const gchar *name_owner, CallType call_type)
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{
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/* The client might have been cancelled (g_bus_unwatch_name()) while we were
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* sitting in the #GMainContext dispatch queue. */
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if (client->cancelled)
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return;
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switch (call_type)
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{
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case CALL_TYPE_NAME_APPEARED:
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if (client->name_appeared_handler != NULL)
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{
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client->name_appeared_handler (connection,
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client->name,
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name_owner,
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client->user_data);
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}
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break;
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case CALL_TYPE_NAME_VANISHED:
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if (client->name_vanished_handler != NULL)
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{
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client->name_vanished_handler (connection,
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client->name,
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client->user_data);
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}
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break;
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default:
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g_assert_not_reached ();
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break;
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}
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}
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static gboolean
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call_in_idle_cb (gpointer _data)
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{
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CallHandlerData *data = _data;
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actually_do_call (data->client, data->connection, data->name_owner, data->call_type);
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return FALSE;
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}
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static void
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schedule_call_in_idle (Client *client, CallType call_type)
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{
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CallHandlerData *data;
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GSource *idle_source;
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data = g_new0 (CallHandlerData, 1);
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data->client = client_ref (client);
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data->connection = client->connection != NULL ? g_object_ref (client->connection) : NULL;
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data->name_owner = g_strdup (client->name_owner);
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data->call_type = call_type;
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idle_source = g_idle_source_new ();
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g_source_set_priority (idle_source, G_PRIORITY_HIGH);
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g_source_set_callback (idle_source,
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call_in_idle_cb,
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data,
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(GDestroyNotify) call_handler_data_free);
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g_source_set_static_name (idle_source, "[gio, gdbusnamewatching.c] call_in_idle_cb");
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g_source_attach (idle_source, client->main_context);
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g_source_unref (idle_source);
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}
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static void
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do_call (Client *client, CallType call_type)
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{
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GMainContext *current_context;
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/* only schedule in idle if we're not in the right thread */
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current_context = g_main_context_ref_thread_default ();
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if (current_context != client->main_context)
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schedule_call_in_idle (client, call_type);
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else
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actually_do_call (client, client->connection, client->name_owner, call_type);
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g_main_context_unref (current_context);
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}
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static void
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call_appeared_handler (Client *client)
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{
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if (client->previous_call != PREVIOUS_CALL_APPEARED)
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{
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client->previous_call = PREVIOUS_CALL_APPEARED;
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if (!client->cancelled && client->name_appeared_handler != NULL)
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{
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do_call (client, CALL_TYPE_NAME_APPEARED);
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}
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}
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}
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static void
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call_vanished_handler (Client *client)
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{
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if (client->previous_call != PREVIOUS_CALL_VANISHED)
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{
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client->previous_call = PREVIOUS_CALL_VANISHED;
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if (!client->cancelled && client->name_vanished_handler != NULL)
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{
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do_call (client, CALL_TYPE_NAME_VANISHED);
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}
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}
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}
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/* ---------------------------------------------------------------------------------------------------- */
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/* Return a reference to the #Client for @watcher_id, or %NULL if it’s been
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* unwatched. This is safe to call from any thread. */
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static Client *
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dup_client (guint watcher_id)
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{
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Client *client;
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G_LOCK (lock);
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g_assert (watcher_id != 0);
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g_assert (map_id_to_client != NULL);
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client = g_hash_table_lookup (map_id_to_client, GUINT_TO_POINTER (watcher_id));
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if (client != NULL)
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client_ref (client);
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G_UNLOCK (lock);
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return client;
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}
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/* Could be called from any thread, so it could be called after client_unref()
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* has started finalising the #Client. Avoid that by looking up the #Client
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* atomically. */
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static void
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on_connection_disconnected (GDBusConnection *connection,
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gboolean remote_peer_vanished,
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GError *error,
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gpointer user_data)
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{
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guint watcher_id = GPOINTER_TO_UINT (user_data);
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Client *client = NULL;
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client = dup_client (watcher_id);
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if (client == NULL)
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return;
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if (client->name_owner_changed_subscription_id > 0)
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g_dbus_connection_signal_unsubscribe (client->connection, client->name_owner_changed_subscription_id);
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if (client->disconnected_signal_handler_id > 0)
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g_signal_handler_disconnect (client->connection, client->disconnected_signal_handler_id);
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g_object_unref (client->connection);
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client->disconnected_signal_handler_id = 0;
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client->name_owner_changed_subscription_id = 0;
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client->connection = NULL;
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call_vanished_handler (client);
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client_unref (client);
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}
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/* ---------------------------------------------------------------------------------------------------- */
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/* Will always be called from the thread which acquired client->main_context. */
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static void
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on_name_owner_changed (GDBusConnection *connection,
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const gchar *sender_name,
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const gchar *object_path,
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const gchar *interface_name,
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const gchar *signal_name,
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GVariant *parameters,
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gpointer user_data)
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{
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guint watcher_id = GPOINTER_TO_UINT (user_data);
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Client *client = NULL;
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const gchar *name;
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const gchar *old_owner;
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const gchar *new_owner;
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client = dup_client (watcher_id);
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if (client == NULL)
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return;
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if (!client->initialized)
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goto out;
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if (g_strcmp0 (object_path, "/org/freedesktop/DBus") != 0 ||
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g_strcmp0 (interface_name, "org.freedesktop.DBus") != 0 ||
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g_strcmp0 (sender_name, "org.freedesktop.DBus") != 0)
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goto out;
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g_variant_get (parameters,
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"(&s&s&s)",
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&name,
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&old_owner,
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&new_owner);
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/* we only care about a specific name */
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if (g_strcmp0 (name, client->name) != 0)
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goto out;
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if ((old_owner != NULL && strlen (old_owner) > 0) && client->name_owner != NULL)
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{
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g_free (client->name_owner);
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client->name_owner = NULL;
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call_vanished_handler (client);
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}
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if (new_owner != NULL && strlen (new_owner) > 0)
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{
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g_warn_if_fail (client->name_owner == NULL);
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g_free (client->name_owner);
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client->name_owner = g_strdup (new_owner);
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call_appeared_handler (client);
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}
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out:
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client_unref (client);
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}
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/* ---------------------------------------------------------------------------------------------------- */
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static void
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get_name_owner_cb (GObject *source_object,
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GAsyncResult *res,
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gpointer user_data)
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{
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Client *client = user_data;
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GVariant *result;
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const char *name_owner;
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name_owner = NULL;
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result = NULL;
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result = g_dbus_connection_call_finish (client->connection,
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res,
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NULL);
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if (result != NULL)
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{
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g_variant_get (result, "(&s)", &name_owner);
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}
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if (name_owner != NULL)
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{
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g_warn_if_fail (client->name_owner == NULL);
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client->name_owner = g_strdup (name_owner);
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call_appeared_handler (client);
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}
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else
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{
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call_vanished_handler (client);
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}
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client->initialized = TRUE;
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if (result != NULL)
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g_variant_unref (result);
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client_unref (client);
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}
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/* ---------------------------------------------------------------------------------------------------- */
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static void
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invoke_get_name_owner (Client *client)
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{
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g_dbus_connection_call (client->connection,
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"org.freedesktop.DBus", /* bus name */
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"/org/freedesktop/DBus", /* object path */
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"org.freedesktop.DBus", /* interface name */
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"GetNameOwner", /* method name */
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g_variant_new ("(s)", client->name),
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G_VARIANT_TYPE ("(s)"),
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G_DBUS_CALL_FLAGS_NONE,
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-1,
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NULL,
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(GAsyncReadyCallback) get_name_owner_cb,
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client_ref (client));
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}
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/* ---------------------------------------------------------------------------------------------------- */
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static void
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start_service_by_name_cb (GObject *source_object,
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GAsyncResult *res,
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gpointer user_data)
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{
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Client *client = user_data;
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GVariant *result;
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result = NULL;
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result = g_dbus_connection_call_finish (client->connection,
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res,
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NULL);
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if (result != NULL)
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{
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guint32 start_service_result;
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g_variant_get (result, "(u)", &start_service_result);
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if (start_service_result == 1) /* DBUS_START_REPLY_SUCCESS */
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{
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invoke_get_name_owner (client);
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}
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else if (start_service_result == 2) /* DBUS_START_REPLY_ALREADY_RUNNING */
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{
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invoke_get_name_owner (client);
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}
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else
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{
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g_warning ("Unexpected reply %d from StartServiceByName() method", start_service_result);
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call_vanished_handler (client);
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client->initialized = TRUE;
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}
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}
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else
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{
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/* Errors are not unexpected; the bus will reply e.g.
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*
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* org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.Epiphany2
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* was not provided by any .service files
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*
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* This doesn't mean that the name doesn't have an owner, just
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* that it's not provided by a .service file. So proceed to
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* invoke GetNameOwner().
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*/
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invoke_get_name_owner (client);
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}
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if (result != NULL)
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g_variant_unref (result);
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client_unref (client);
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}
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/* ---------------------------------------------------------------------------------------------------- */
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static void
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has_connection (Client *client)
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{
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/* listen for disconnection */
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client->disconnected_signal_handler_id = g_signal_connect (client->connection,
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"closed",
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G_CALLBACK (on_connection_disconnected),
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GUINT_TO_POINTER (client->id));
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/* start listening to NameOwnerChanged messages immediately */
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client->name_owner_changed_subscription_id = g_dbus_connection_signal_subscribe (client->connection,
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"org.freedesktop.DBus", /* name */
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"org.freedesktop.DBus", /* if */
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"NameOwnerChanged", /* signal */
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"/org/freedesktop/DBus", /* path */
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client->name,
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G_DBUS_SIGNAL_FLAGS_NONE,
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on_name_owner_changed,
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GUINT_TO_POINTER (client->id),
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NULL);
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if (client->flags & G_BUS_NAME_WATCHER_FLAGS_AUTO_START)
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{
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g_dbus_connection_call (client->connection,
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"org.freedesktop.DBus", /* bus name */
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"/org/freedesktop/DBus", /* object path */
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"org.freedesktop.DBus", /* interface name */
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"StartServiceByName", /* method name */
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g_variant_new ("(su)", client->name, 0),
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G_VARIANT_TYPE ("(u)"),
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G_DBUS_CALL_FLAGS_NONE,
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-1,
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NULL,
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(GAsyncReadyCallback) start_service_by_name_cb,
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client_ref (client));
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}
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else
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{
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/* check owner */
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invoke_get_name_owner (client);
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}
|
||
}
|
||
|
||
|
||
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);
|
||
}
|
||
}
|