| /* 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 "gdbusutils.h" |
| #include "gdbusnameowning.h" |
| #include "gdbuserror.h" |
| #include "gdbusprivate.h" |
| #include "gdbusconnection.h" |
| |
| #include "glibintl.h" |
| |
| /** |
| * SECTION:gdbusnameowning |
| * @title: Owning Bus Names |
| * @short_description: Simple API for owning bus names |
| * @include: gio/gio.h |
| * |
| * Convenience API for owning bus names. |
| * |
| * A simple example for owning a name can be found in |
| * [gdbus-example-own-name.c](https://gitlab.gnome.org/GNOME/glib/-/blob/HEAD/gio/tests/gdbus-example-own-name.c) |
| */ |
| |
| G_LOCK_DEFINE_STATIC (lock); |
| |
| /* ---------------------------------------------------------------------------------------------------- */ |
| |
| typedef enum |
| { |
| PREVIOUS_CALL_NONE = 0, |
| PREVIOUS_CALL_ACQUIRED, |
| PREVIOUS_CALL_LOST, |
| } PreviousCall; |
| |
| typedef struct |
| { |
| gint ref_count; /* (atomic) */ |
| guint id; |
| GBusNameOwnerFlags flags; |
| gchar *name; |
| GBusAcquiredCallback bus_acquired_handler; |
| GBusNameAcquiredCallback name_acquired_handler; |
| GBusNameLostCallback name_lost_handler; |
| gpointer user_data; |
| GDestroyNotify user_data_free_func; |
| GMainContext *main_context; |
| |
| PreviousCall previous_call; |
| |
| GDBusConnection *connection; |
| gulong disconnected_signal_handler_id; |
| guint name_acquired_subscription_id; |
| guint name_lost_subscription_id; |
| |
| gboolean cancelled; /* must hold lock when reading or modifying */ |
| |
| gboolean needs_release; |
| } Client; |
| |
| static guint next_global_id = 1; |
| 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->disconnected_signal_handler_id > 0) |
| g_signal_handler_disconnect (client->connection, client->disconnected_signal_handler_id); |
| if (client->name_acquired_subscription_id > 0) |
| g_dbus_connection_signal_unsubscribe (client->connection, client->name_acquired_subscription_id); |
| if (client->name_lost_subscription_id > 0) |
| g_dbus_connection_signal_unsubscribe (client->connection, client->name_lost_subscription_id); |
| g_object_unref (client->connection); |
| } |
| g_main_context_unref (client->main_context); |
| g_free (client->name); |
| if (client->user_data_free_func != NULL) |
| client->user_data_free_func (client->user_data); |
| g_free (client); |
| } |
| } |
| |
| /* ---------------------------------------------------------------------------------------------------- */ |
| |
| |
| typedef enum |
| { |
| CALL_TYPE_NAME_ACQUIRED, |
| CALL_TYPE_NAME_LOST |
| } CallType; |
| |
| typedef struct |
| { |
| Client *client; |
| |
| /* keep this separate because client->connection may |
| * be set to NULL after scheduling the call |
| */ |
| GDBusConnection *connection; |
| |
| /* set to TRUE to call acquired */ |
| CallType call_type; |
| } CallHandlerData; |
| |
| static void |
| call_handler_data_free (CallHandlerData *data) |
| { |
| if (data->connection != NULL) |
| g_object_unref (data->connection); |
| client_unref (data->client); |
| g_free (data); |
| } |
| |
| static void |
| actually_do_call (Client *client, GDBusConnection *connection, CallType call_type) |
| { |
| switch (call_type) |
| { |
| case CALL_TYPE_NAME_ACQUIRED: |
| if (client->name_acquired_handler != NULL) |
| { |
| client->name_acquired_handler (connection, |
| client->name, |
| client->user_data); |
| } |
| break; |
| |
| case CALL_TYPE_NAME_LOST: |
| if (client->name_lost_handler != NULL) |
| { |
| client->name_lost_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->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->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, gdbusnameowning.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, call_type); |
| g_main_context_unref (current_context); |
| } |
| |
| static void |
| call_acquired_handler (Client *client) |
| { |
| G_LOCK (lock); |
| if (client->previous_call != PREVIOUS_CALL_ACQUIRED) |
| { |
| client->previous_call = PREVIOUS_CALL_ACQUIRED; |
| if (!client->cancelled) |
| { |
| G_UNLOCK (lock); |
| do_call (client, CALL_TYPE_NAME_ACQUIRED); |
| goto out; |
| } |
| } |
| G_UNLOCK (lock); |
| out: |
| ; |
| } |
| |
| static void |
| call_lost_handler (Client *client) |
| { |
| G_LOCK (lock); |
| if (client->previous_call != PREVIOUS_CALL_LOST) |
| { |
| client->previous_call = PREVIOUS_CALL_LOST; |
| if (!client->cancelled) |
| { |
| G_UNLOCK (lock); |
| do_call (client, CALL_TYPE_NAME_LOST); |
| goto out; |
| } |
| } |
| G_UNLOCK (lock); |
| out: |
| ; |
| } |
| |
| /* ---------------------------------------------------------------------------------------------------- */ |
| |
| static void |
| on_name_lost_or_acquired (GDBusConnection *connection, |
| const gchar *sender_name, |
| const gchar *object_path, |
| const gchar *interface_name, |
| const gchar *signal_name, |
| GVariant *parameters, |
| gpointer user_data) |
| { |
| Client *client = user_data; |
| const gchar *name; |
| |
| 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; |
| |
| if (!g_variant_is_of_type (parameters, G_VARIANT_TYPE ("(s)"))) |
| { |
| g_warning ("%s signal had unexpected signature %s", signal_name, |
| g_variant_get_type_string (parameters)); |
| goto out; |
| } |
| |
| if (g_strcmp0 (signal_name, "NameLost") == 0) |
| { |
| g_variant_get (parameters, "(&s)", &name); |
| if (g_strcmp0 (name, client->name) == 0) |
| { |
| call_lost_handler (client); |
| } |
| } |
| else if (g_strcmp0 (signal_name, "NameAcquired") == 0) |
| { |
| g_variant_get (parameters, "(&s)", &name); |
| if (g_strcmp0 (name, client->name) == 0) |
| { |
| call_acquired_handler (client); |
| } |
| } |
| out: |
| ; |
| } |
| |
| /* ---------------------------------------------------------------------------------------------------- */ |
| |
| static void |
| request_name_cb (GObject *source_object, |
| GAsyncResult *res, |
| gpointer user_data) |
| { |
| Client *client = user_data; |
| GVariant *result; |
| guint32 request_name_reply; |
| gboolean unsubscribe; |
| |
| request_name_reply = 0; |
| result = NULL; |
| |
| /* don't use client->connection - it may be NULL already */ |
| result = g_dbus_connection_call_finish (G_DBUS_CONNECTION (source_object), |
| res, |
| NULL); |
| if (result != NULL) |
| { |
| g_variant_get (result, "(u)", &request_name_reply); |
| g_variant_unref (result); |
| } |
| |
| unsubscribe = FALSE; |
| |
| switch (request_name_reply) |
| { |
| case 1: /* DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER */ |
| /* We got the name - now listen for NameLost and NameAcquired */ |
| call_acquired_handler (client); |
| break; |
| |
| case 2: /* DBUS_REQUEST_NAME_REPLY_IN_QUEUE */ |
| /* Waiting in line - listen for NameLost and NameAcquired */ |
| call_lost_handler (client); |
| break; |
| |
| default: |
| /* assume we couldn't get the name - explicit fallthrough */ |
| case 3: /* DBUS_REQUEST_NAME_REPLY_EXISTS */ |
| case 4: /* DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER */ |
| /* Some other part of the process is already owning the name */ |
| call_lost_handler (client); |
| unsubscribe = TRUE; |
| client->needs_release = FALSE; |
| break; |
| } |
| |
| /* If we’re not the owner and not in the queue, there’s no point in continuing |
| * to listen to NameAcquired or NameLost. */ |
| if (unsubscribe) |
| { |
| GDBusConnection *connection = NULL; |
| |
| /* make sure we use a known good Connection object since it may be set to |
| * NULL at any point after being cancelled |
| */ |
| G_LOCK (lock); |
| if (!client->cancelled) |
| connection = g_object_ref (client->connection); |
| G_UNLOCK (lock); |
| |
| if (connection != NULL) |
| { |
| if (client->name_acquired_subscription_id > 0) |
| g_dbus_connection_signal_unsubscribe (client->connection, client->name_acquired_subscription_id); |
| if (client->name_lost_subscription_id > 0) |
| g_dbus_connection_signal_unsubscribe (client->connection, client->name_lost_subscription_id); |
| client->name_acquired_subscription_id = 0; |
| client->name_lost_subscription_id = 0; |
| |
| g_object_unref (connection); |
| } |
| } |
| |
| client_unref (client); |
| } |
| |
| /* ---------------------------------------------------------------------------------------------------- */ |
| |
| static void |
| on_connection_disconnected (GDBusConnection *connection, |
| gboolean remote_peer_vanished, |
| GError *error, |
| gpointer user_data) |
| { |
| Client *client = user_data; |
| |
| if (client->disconnected_signal_handler_id > 0) |
| g_signal_handler_disconnect (client->connection, client->disconnected_signal_handler_id); |
| if (client->name_acquired_subscription_id > 0) |
| g_dbus_connection_signal_unsubscribe (client->connection, client->name_acquired_subscription_id); |
| if (client->name_lost_subscription_id > 0) |
| g_dbus_connection_signal_unsubscribe (client->connection, client->name_lost_subscription_id); |
| g_object_unref (client->connection); |
| client->disconnected_signal_handler_id = 0; |
| client->name_acquired_subscription_id = 0; |
| client->name_lost_subscription_id = 0; |
| client->connection = NULL; |
| |
| call_lost_handler (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), |
| client); |
| |
| /* Start listening to NameLost and NameAcquired messages. We hold |
| * references to the Client in the signal closures, since it’s possible |
| * for a signal to be in-flight after unsubscribing the signal handler. |
| * This creates a reference count cycle, but that’s explicitly broken by |
| * disconnecting the signal handlers before calling client_unref() in |
| * g_bus_unown_name(). |
| * |
| * Subscribe to NameLost and NameAcquired before calling RequestName() to |
| * avoid the potential race of losing the name between receiving a reply to |
| * RequestName() and subscribing to NameLost. The #PreviousCall state will |
| * ensure that the user callbacks get called an appropriate number of times. */ |
| client->name_lost_subscription_id = |
| g_dbus_connection_signal_subscribe (client->connection, |
| "org.freedesktop.DBus", |
| "org.freedesktop.DBus", |
| "NameLost", |
| "/org/freedesktop/DBus", |
| client->name, |
| G_DBUS_SIGNAL_FLAGS_NONE, |
| on_name_lost_or_acquired, |
| client_ref (client), |
| (GDestroyNotify) client_unref); |
| client->name_acquired_subscription_id = |
| g_dbus_connection_signal_subscribe (client->connection, |
| "org.freedesktop.DBus", |
| "org.freedesktop.DBus", |
| "NameAcquired", |
| "/org/freedesktop/DBus", |
| client->name, |
| G_DBUS_SIGNAL_FLAGS_NONE, |
| on_name_lost_or_acquired, |
| client_ref (client), |
| (GDestroyNotify) client_unref); |
| |
| /* attempt to acquire the name */ |
| client->needs_release = TRUE; |
| g_dbus_connection_call (client->connection, |
| "org.freedesktop.DBus", /* bus name */ |
| "/org/freedesktop/DBus", /* object path */ |
| "org.freedesktop.DBus", /* interface name */ |
| "RequestName", /* method name */ |
| g_variant_new ("(su)", |
| client->name, |
| client->flags), |
| G_VARIANT_TYPE ("(u)"), |
| G_DBUS_CALL_FLAGS_NONE, |
| -1, |
| NULL, |
| (GAsyncReadyCallback) request_name_cb, |
| client_ref (client)); |
| } |
| |
| |
| static void |
| connection_get_cb (GObject *source_object, |
| GAsyncResult *res, |
| gpointer user_data) |
| { |
| Client *client = user_data; |
| |
| /* must not do anything if already cancelled */ |
| G_LOCK (lock); |
| if (client->cancelled) |
| { |
| G_UNLOCK (lock); |
| goto out; |
| } |
| G_UNLOCK (lock); |
| |
| client->connection = g_bus_get_finish (res, NULL); |
| if (client->connection == NULL) |
| { |
| call_lost_handler (client); |
| goto out; |
| } |
| |
| /* No need to schedule this in idle as we're already in the thread |
| * that the user called g_bus_own_name() from. This is because |
| * g_bus_get() guarantees that. |
| * |
| * Also, we need to ensure that the handler is invoked *before* |
| * we call RequestName(). Otherwise there is a race. |
| */ |
| if (client->bus_acquired_handler != NULL) |
| { |
| client->bus_acquired_handler (client->connection, |
| client->name, |
| client->user_data); |
| } |
| |
| has_connection (client); |
| |
| out: |
| client_unref (client); |
| } |
| |
| /* ---------------------------------------------------------------------------------------------------- */ |
| |
| /** |
| * g_bus_own_name_on_connection: |
| * @connection: a #GDBusConnection |
| * @name: the well-known name to own |
| * @flags: a set of flags from the #GBusNameOwnerFlags enumeration |
| * @name_acquired_handler: (nullable): handler to invoke when @name is acquired or %NULL |
| * @name_lost_handler: (nullable): handler to invoke when @name is lost 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_own_name() but takes a #GDBusConnection instead of a |
| * #GBusType. |
| * |
| * Returns: an identifier (never 0) that can be used with |
| * g_bus_unown_name() to stop owning the name |
| * |
| * Since: 2.26 |
| */ |
| guint |
| g_bus_own_name_on_connection (GDBusConnection *connection, |
| const gchar *name, |
| GBusNameOwnerFlags flags, |
| GBusNameAcquiredCallback name_acquired_handler, |
| GBusNameLostCallback name_lost_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) && !g_dbus_is_unique_name (name), 0); |
| |
| G_LOCK (lock); |
| |
| client = g_new0 (Client, 1); |
| client->ref_count = 1; |
| client->id = next_global_id++; /* TODO: uh oh, handle overflow */ |
| client->name = g_strdup (name); |
| client->flags = flags; |
| client->name_acquired_handler = name_acquired_handler; |
| client->name_lost_handler = name_lost_handler; |
| client->user_data = user_data; |
| client->user_data_free_func = user_data_free_func; |
| client->main_context = g_main_context_ref_thread_default (); |
| |
| client->connection = g_object_ref (connection); |
| |
| 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_UNLOCK (lock); |
| |
| has_connection (client); |
| |
| return client->id; |
| } |
| |
| /** |
| * g_bus_own_name: |
| * @bus_type: the type of bus to own a name on |
| * @name: the well-known name to own |
| * @flags: a set of flags from the #GBusNameOwnerFlags enumeration |
| * @bus_acquired_handler: (nullable): handler to invoke when connected to the bus of type @bus_type or %NULL |
| * @name_acquired_handler: (nullable): handler to invoke when @name is acquired or %NULL |
| * @name_lost_handler: (nullable): handler to invoke when @name is lost or %NULL |
| * @user_data: user data to pass to handlers |
| * @user_data_free_func: (nullable): function for freeing @user_data or %NULL |
| * |
| * Starts acquiring @name on the bus specified by @bus_type and calls |
| * @name_acquired_handler and @name_lost_handler when the name is |
| * acquired respectively lost. 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 @name_acquired_handler and @name_lost_handler |
| * callbacks will be invoked after calling this function - there are three |
| * possible cases: |
| * |
| * - @name_lost_handler with a %NULL connection (if a connection to the bus |
| * can't be made). |
| * |
| * - @bus_acquired_handler then @name_lost_handler (if the name can't be |
| * obtained) |
| * |
| * - @bus_acquired_handler then @name_acquired_handler (if the name was |
| * obtained). |
| * |
| * When you are done owning the name, just call g_bus_unown_name() |
| * with the owner id this function returns. |
| * |
| * If the name is acquired or lost (for example another application |
| * could acquire the name if you allow replacement or the application |
| * currently owning the name exits), the handlers are also invoked. |
| * If the #GDBusConnection that is used for attempting to own the name |
| * closes, then @name_lost_handler is invoked since it is no longer |
| * possible for other processes to access the process. |
| * |
| * You cannot use g_bus_own_name() several times for the same name (unless |
| * interleaved with calls to g_bus_unown_name()) - only the first call |
| * will work. |
| * |
| * Another guarantee is that invocations of @name_acquired_handler |
| * and @name_lost_handler are guaranteed to alternate; that |
| * is, if @name_acquired_handler is invoked then you are |
| * guaranteed that the next time one of the handlers is invoked, it |
| * will be @name_lost_handler. The reverse is also true. |
| * |
| * If you plan on exporting objects (using e.g. |
| * g_dbus_connection_register_object()), note that it is generally too late |
| * to export the objects in @name_acquired_handler. Instead, you can do this |
| * in @bus_acquired_handler since you are guaranteed that this will run |
| * before @name is requested from the bus. |
| * |
| * This behavior makes it very simple to write applications that wants |
| * to [own names][gdbus-owning-names] and export objects. |
| * Simply register objects to be exported in @bus_acquired_handler and |
| * unregister the objects (if any) in @name_lost_handler. |
| * |
| * Returns: an identifier (never 0) that can be used with |
| * g_bus_unown_name() to stop owning the name. |
| * |
| * Since: 2.26 |
| */ |
| guint |
| g_bus_own_name (GBusType bus_type, |
| const gchar *name, |
| GBusNameOwnerFlags flags, |
| GBusAcquiredCallback bus_acquired_handler, |
| GBusNameAcquiredCallback name_acquired_handler, |
| GBusNameLostCallback name_lost_handler, |
| gpointer user_data, |
| GDestroyNotify user_data_free_func) |
| { |
| Client *client; |
| |
| g_return_val_if_fail (g_dbus_is_name (name) && !g_dbus_is_unique_name (name), 0); |
| |
| G_LOCK (lock); |
| |
| client = g_new0 (Client, 1); |
| client->ref_count = 1; |
| client->id = next_global_id++; /* TODO: uh oh, handle overflow */ |
| client->name = g_strdup (name); |
| client->flags = flags; |
| client->bus_acquired_handler = bus_acquired_handler; |
| client->name_acquired_handler = name_acquired_handler; |
| client->name_lost_handler = name_lost_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; |
| } |
| |
| typedef struct { |
| GClosure *bus_acquired_closure; |
| GClosure *name_acquired_closure; |
| GClosure *name_lost_closure; |
| } OwnNameData; |
| |
| static OwnNameData * |
| own_name_data_new (GClosure *bus_acquired_closure, |
| GClosure *name_acquired_closure, |
| GClosure *name_lost_closure) |
| { |
| OwnNameData *data; |
| |
| data = g_new0 (OwnNameData, 1); |
| |
| if (bus_acquired_closure != NULL) |
| { |
| data->bus_acquired_closure = g_closure_ref (bus_acquired_closure); |
| g_closure_sink (bus_acquired_closure); |
| if (G_CLOSURE_NEEDS_MARSHAL (bus_acquired_closure)) |
| g_closure_set_marshal (bus_acquired_closure, g_cclosure_marshal_generic); |
| } |
| |
| if (name_acquired_closure != NULL) |
| { |
| data->name_acquired_closure = g_closure_ref (name_acquired_closure); |
| g_closure_sink (name_acquired_closure); |
| if (G_CLOSURE_NEEDS_MARSHAL (name_acquired_closure)) |
| g_closure_set_marshal (name_acquired_closure, g_cclosure_marshal_generic); |
| } |
| |
| if (name_lost_closure != NULL) |
| { |
| data->name_lost_closure = g_closure_ref (name_lost_closure); |
| g_closure_sink (name_lost_closure); |
| if (G_CLOSURE_NEEDS_MARSHAL (name_lost_closure)) |
| g_closure_set_marshal (name_lost_closure, g_cclosure_marshal_generic); |
| } |
| |
| return data; |
| } |
| |
| static void |
| own_with_closures_on_bus_acquired (GDBusConnection *connection, |
| const gchar *name, |
| gpointer user_data) |
| { |
| OwnNameData *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->bus_acquired_closure, NULL, 2, params, NULL); |
| |
| g_value_unset (params + 0); |
| g_value_unset (params + 1); |
| } |
| |
| static void |
| own_with_closures_on_name_acquired (GDBusConnection *connection, |
| const gchar *name, |
| gpointer user_data) |
| { |
| OwnNameData *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_acquired_closure, NULL, 2, params, NULL); |
| |
| g_value_unset (params + 0); |
| g_value_unset (params + 1); |
| } |
| |
| static void |
| own_with_closures_on_name_lost (GDBusConnection *connection, |
| const gchar *name, |
| gpointer user_data) |
| { |
| OwnNameData *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_lost_closure, NULL, 2, params, NULL); |
| |
| g_value_unset (params + 0); |
| g_value_unset (params + 1); |
| } |
| |
| static void |
| bus_own_name_free_func (gpointer user_data) |
| { |
| OwnNameData *data = user_data; |
| |
| if (data->bus_acquired_closure != NULL) |
| g_closure_unref (data->bus_acquired_closure); |
| |
| if (data->name_acquired_closure != NULL) |
| g_closure_unref (data->name_acquired_closure); |
| |
| if (data->name_lost_closure != NULL) |
| g_closure_unref (data->name_lost_closure); |
| |
| g_free (data); |
| } |
| |
| /** |
| * g_bus_own_name_with_closures: (rename-to g_bus_own_name) |
| * @bus_type: the type of bus to own a name on |
| * @name: the well-known name to own |
| * @flags: a set of flags from the #GBusNameOwnerFlags enumeration |
| * @bus_acquired_closure: (nullable): #GClosure to invoke when connected to |
| * the bus of type @bus_type or %NULL |
| * @name_acquired_closure: (nullable): #GClosure to invoke when @name is |
| * acquired or %NULL |
| * @name_lost_closure: (nullable): #GClosure to invoke when @name is lost or |
| * %NULL |
| * |
| * Version of g_bus_own_name() using closures instead of callbacks for |
| * easier binding in other languages. |
| * |
| * Returns: an identifier (never 0) that can be used with |
| * g_bus_unown_name() to stop owning the name. |
| * |
| * Since: 2.26 |
| */ |
| guint |
| g_bus_own_name_with_closures (GBusType bus_type, |
| const gchar *name, |
| GBusNameOwnerFlags flags, |
| GClosure *bus_acquired_closure, |
| GClosure *name_acquired_closure, |
| GClosure *name_lost_closure) |
| { |
| return g_bus_own_name (bus_type, |
| name, |
| flags, |
| bus_acquired_closure != NULL ? own_with_closures_on_bus_acquired : NULL, |
| name_acquired_closure != NULL ? own_with_closures_on_name_acquired : NULL, |
| name_lost_closure != NULL ? own_with_closures_on_name_lost : NULL, |
| own_name_data_new (bus_acquired_closure, |
| name_acquired_closure, |
| name_lost_closure), |
| bus_own_name_free_func); |
| } |
| |
| /** |
| * g_bus_own_name_on_connection_with_closures: (rename-to g_bus_own_name_on_connection) |
| * @connection: a #GDBusConnection |
| * @name: the well-known name to own |
| * @flags: a set of flags from the #GBusNameOwnerFlags enumeration |
| * @name_acquired_closure: (nullable): #GClosure to invoke when @name is |
| * acquired or %NULL |
| * @name_lost_closure: (nullable): #GClosure to invoke when @name is lost |
| * or %NULL |
| * |
| * Version of g_bus_own_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_unown_name() to stop owning the name. |
| * |
| * Since: 2.26 |
| */ |
| guint |
| g_bus_own_name_on_connection_with_closures (GDBusConnection *connection, |
| const gchar *name, |
| GBusNameOwnerFlags flags, |
| GClosure *name_acquired_closure, |
| GClosure *name_lost_closure) |
| { |
| return g_bus_own_name_on_connection (connection, |
| name, |
| flags, |
| name_acquired_closure != NULL ? own_with_closures_on_name_acquired : NULL, |
| name_lost_closure != NULL ? own_with_closures_on_name_lost : NULL, |
| own_name_data_new (NULL, |
| name_acquired_closure, |
| name_lost_closure), |
| bus_own_name_free_func); |
| } |
| |
| /** |
| * g_bus_unown_name: |
| * @owner_id: an identifier obtained from g_bus_own_name() |
| * |
| * Stops owning a name. |
| * |
| * Note that there may still be D-Bus traffic to process (relating to owning |
| * and unowning 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_own_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_unown_name (guint owner_id) |
| { |
| Client *client; |
| |
| g_return_if_fail (owner_id > 0); |
| |
| client = NULL; |
| |
| G_LOCK (lock); |
| if (owner_id == 0 || map_id_to_client == NULL || |
| (client = g_hash_table_lookup (map_id_to_client, GUINT_TO_POINTER (owner_id))) == NULL) |
| { |
| g_warning ("Invalid id %d passed to g_bus_unown_name()", owner_id); |
| goto out; |
| } |
| |
| client->cancelled = TRUE; |
| g_warn_if_fail (g_hash_table_remove (map_id_to_client, GUINT_TO_POINTER (owner_id))); |
| |
| out: |
| G_UNLOCK (lock); |
| |
| /* do callback without holding lock */ |
| if (client != NULL) |
| { |
| /* Release the name if needed */ |
| if (client->needs_release && |
| client->connection != NULL && |
| !g_dbus_connection_is_closed (client->connection)) |
| { |
| GVariant *result; |
| GError *error; |
| guint32 release_name_reply; |
| |
| /* TODO: it kinda sucks having to do a sync call to release the name - but if |
| * we don't, then a subsequent grab of the name will make the bus daemon return |
| * IN_QUEUE which will trigger name_lost(). |
| * |
| * I believe this is a bug in the bus daemon. |
| */ |
| error = NULL; |
| result = g_dbus_connection_call_sync (client->connection, |
| "org.freedesktop.DBus", /* bus name */ |
| "/org/freedesktop/DBus", /* object path */ |
| "org.freedesktop.DBus", /* interface name */ |
| "ReleaseName", /* method name */ |
| g_variant_new ("(s)", client->name), |
| G_VARIANT_TYPE ("(u)"), |
| G_DBUS_CALL_FLAGS_NONE, |
| -1, |
| NULL, |
| &error); |
| if (result == NULL) |
| { |
| g_warning ("Error releasing name %s: %s", client->name, error->message); |
| g_error_free (error); |
| } |
| else |
| { |
| g_variant_get (result, "(u)", &release_name_reply); |
| if (release_name_reply != 1 /* DBUS_RELEASE_NAME_REPLY_RELEASED */) |
| { |
| g_warning ("Unexpected reply %d when releasing name %s", release_name_reply, client->name); |
| } |
| else |
| { |
| client->needs_release = FALSE; |
| } |
| g_variant_unref (result); |
| } |
| } |
| |
| if (client->disconnected_signal_handler_id > 0) |
| g_signal_handler_disconnect (client->connection, client->disconnected_signal_handler_id); |
| if (client->name_acquired_subscription_id > 0) |
| g_dbus_connection_signal_unsubscribe (client->connection, client->name_acquired_subscription_id); |
| if (client->name_lost_subscription_id > 0) |
| g_dbus_connection_signal_unsubscribe (client->connection, client->name_lost_subscription_id); |
| client->disconnected_signal_handler_id = 0; |
| client->name_acquired_subscription_id = 0; |
| client->name_lost_subscription_id = 0; |
| if (client->connection != NULL) |
| { |
| g_object_unref (client->connection); |
| client->connection = NULL; |
| } |
| |
| client_unref (client); |
| } |
| } |
