mirror of
https://gitlab.gnome.org/GNOME/glib.git
synced 2024-11-06 17:36:14 +01:00
6b15af3c4c
This makes no functional changes, but does tidy the code up a bit and means `g_steal_handle_id()` gets a bit more testing. Signed-off-by: Philip Withnall <pwithnall@gnome.org>
981 lines
33 KiB
C
981 lines
33 KiB
C
/* GDBus - GLib D-Bus Library
|
||
*
|
||
* Copyright (C) 2008-2010 Red Hat, Inc.
|
||
*
|
||
* SPDX-License-Identifier: LGPL-2.1-or-later
|
||
*
|
||
* This library is free software; you can redistribute it and/or
|
||
* modify it under the terms of the GNU Lesser General Public
|
||
* License as published by the Free Software Foundation; either
|
||
* version 2.1 of the License, or (at your option) any later version.
|
||
*
|
||
* This library is distributed in the hope that it will be useful,
|
||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
* Lesser General Public License for more details.
|
||
*
|
||
* You should have received a copy of the GNU Lesser General
|
||
* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
|
||
*
|
||
* Author: David Zeuthen <davidz@redhat.com>
|
||
*/
|
||
|
||
#include "config.h"
|
||
|
||
#include <stdlib.h>
|
||
|
||
#include "gdbusutils.h"
|
||
#include "gdbusnameowning.h"
|
||
#include "gdbuserror.h"
|
||
#include "gdbusprivate.h"
|
||
#include "gdbusconnection.h"
|
||
|
||
#include "glibintl.h"
|
||
|
||
G_LOCK_DEFINE_STATIC (lock);
|
||
|
||
/* ---------------------------------------------------------------------------------------------------- */
|
||
|
||
typedef enum
|
||
{
|
||
PREVIOUS_CALL_NONE = 0,
|
||
PREVIOUS_CALL_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, g_steal_handle_id (&client->name_acquired_subscription_id));
|
||
if (client->name_lost_subscription_id > 0)
|
||
g_dbus_connection_signal_unsubscribe (client->connection, g_steal_handle_id (&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_static_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, DBUS_PATH_DBUS) != 0 ||
|
||
g_strcmp0 (interface_name, DBUS_INTERFACE_DBUS) != 0 ||
|
||
g_strcmp0 (sender_name, DBUS_SERVICE_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 DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER:
|
||
/* We got the name - now listen for NameLost and NameAcquired */
|
||
call_acquired_handler (client);
|
||
break;
|
||
|
||
case 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 DBUS_REQUEST_NAME_REPLY_EXISTS:
|
||
case 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, g_steal_handle_id (&client->name_acquired_subscription_id));
|
||
if (client->name_lost_subscription_id > 0)
|
||
g_dbus_connection_signal_unsubscribe (client->connection, g_steal_handle_id (&client->name_lost_subscription_id));
|
||
|
||
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, g_steal_handle_id (&client->name_acquired_subscription_id));
|
||
if (client->name_lost_subscription_id > 0)
|
||
g_dbus_connection_signal_unsubscribe (client->connection, g_steal_handle_id (&client->name_lost_subscription_id));
|
||
g_object_unref (client->connection);
|
||
client->disconnected_signal_handler_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,
|
||
DBUS_SERVICE_DBUS,
|
||
DBUS_INTERFACE_DBUS,
|
||
"NameLost",
|
||
DBUS_PATH_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,
|
||
DBUS_SERVICE_DBUS,
|
||
DBUS_INTERFACE_DBUS,
|
||
"NameAcquired",
|
||
DBUS_PATH_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,
|
||
DBUS_SERVICE_DBUS,
|
||
DBUS_PATH_DBUS,
|
||
DBUS_INTERFACE_DBUS,
|
||
"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) (scope notified): handler to invoke when
|
||
* @name is acquired or %NULL
|
||
* @name_lost_handler: (nullable) (scope notified): 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) (scope notified): handler to invoke when
|
||
* connected to the bus of type @bus_type or %NULL
|
||
* @name_acquired_handler: (nullable) (scope notified): handler to invoke when
|
||
* @name is acquired or %NULL
|
||
* @name_lost_handler: (nullable) (scope notified): 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,
|
||
DBUS_SERVICE_DBUS,
|
||
DBUS_PATH_DBUS,
|
||
DBUS_INTERFACE_DBUS,
|
||
"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 != 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, g_steal_handle_id (&client->name_acquired_subscription_id));
|
||
if (client->name_lost_subscription_id > 0)
|
||
g_dbus_connection_signal_unsubscribe (client->connection, g_steal_handle_id (&client->name_lost_subscription_id));
|
||
client->disconnected_signal_handler_id = 0;
|
||
if (client->connection != NULL)
|
||
{
|
||
g_object_unref (client->connection);
|
||
client->connection = NULL;
|
||
}
|
||
|
||
client_unref (client);
|
||
}
|
||
}
|