--- /dev/null
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+/* dbus-bus.c Convenience functions for communicating with the bus.
+ *
+ * Copyright (C) 2003 CodeFactory AB
+ * Copyright (C) 2003 Red Hat, Inc.
+ *
+ * Licensed under the Academic Free License version 2.1
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include "dbus-bus.h"
+#include "dbus-protocol.h"
+#include "dbus-internals.h"
+#include "dbus-message.h"
+#include "dbus-marshal-validate.h"
+#include "dbus-threads-internal.h"
+#include "dbus-connection-internal.h"
+#include <string.h>
+
+/**
+ * @defgroup DBusBus Message bus APIs
+ * @ingroup DBus
+ * @brief Functions for communicating with the message bus
+ *
+ * dbus_bus_get() allows all modules and libraries in a given
+ * process to share the same connection to the bus daemon by storing
+ * the connection globally.
+ *
+ * All other functions in this module are just convenience functions;
+ * most of them invoke methods on the bus daemon, by sending method
+ * call messages to #DBUS_SERVICE_DBUS. These convenience functions
+ * often make blocking method calls. If you don't want to block,
+ * you can send the method call messages manually in the same way
+ * you would any other method call message.
+ *
+ * This module is the only one in libdbus that's specific to
+ * communicating with the message bus daemon. The rest of the API can
+ * also be used for connecting to another application directly.
+ *
+ * @todo right now the default address of the system bus is hardcoded,
+ * so if you change it in the global config file suddenly you have to
+ * set DBUS_SYSTEM_BUS_ADDRESS env variable. Might be nice if the
+ * client lib somehow read the config file, or if the bus on startup
+ * somehow wrote out its address to a well-known spot, but might also
+ * not be worth it.
+ */
+
+/**
+ * @defgroup DBusBusInternals Message bus APIs internals
+ * @ingroup DBusInternals
+ * @brief Internals of functions for communicating with the message bus
+ *
+ * @{
+ */
+
+/**
+ * Block of message-bus-related data we attach to each
+ * #DBusConnection used with these convenience functions.
+ *
+ */
+typedef struct
+{
+ DBusConnection *connection; /**< Connection we're associated with */
+ char *unique_name; /**< Unique name of this connection */
+
+ unsigned int is_well_known : 1; /**< Is one of the well-known connections in our global array */
+} BusData;
+
+/** The slot we have reserved to store BusData.
+ */
+static dbus_int32_t bus_data_slot = -1;
+
+/** Number of bus types */
+#define N_BUS_TYPES 3
+
+static DBusConnection *bus_connections[N_BUS_TYPES];
+static char *bus_connection_addresses[N_BUS_TYPES] = { NULL, NULL, NULL };
+
+static DBusBusType activation_bus_type = DBUS_BUS_STARTER;
+
+static dbus_bool_t initialized = FALSE;
+
+/**
+ * Lock for globals in this file
+ */
+_DBUS_DEFINE_GLOBAL_LOCK (bus);
+
+/**
+ * Global lock covering all BusData on any connection. The bet is
+ * that some lock contention is better than more memory
+ * for a per-connection lock, but it's tough to imagine it mattering
+ * either way.
+ */
+_DBUS_DEFINE_GLOBAL_LOCK (bus_datas);
+
+static void
+addresses_shutdown_func (void *data)
+{
+ int i;
+
+ i = 0;
+ while (i < N_BUS_TYPES)
+ {
+ if (bus_connections[i] != NULL)
+ _dbus_warn_check_failed ("dbus_shutdown() called but connections were still live. This probably means the application did not drop all its references to bus connections.\n");
+
+ dbus_free (bus_connection_addresses[i]);
+ bus_connection_addresses[i] = NULL;
+ ++i;
+ }
+
+ activation_bus_type = DBUS_BUS_STARTER;
+
+ initialized = FALSE;
+}
+
+static dbus_bool_t
+get_from_env (char **connection_p,
+ const char *env_var)
+{
+ const char *s;
+
+ _dbus_assert (*connection_p == NULL);
+
+ s = _dbus_getenv (env_var);
+ if (s == NULL || *s == '\0')
+ return TRUE; /* successfully didn't use the env var */
+ else
+ {
+ *connection_p = _dbus_strdup (s);
+ return *connection_p != NULL;
+ }
+}
+
+static dbus_bool_t
+init_connections_unlocked (void)
+{
+ if (!initialized)
+ {
+ const char *s;
+ int i;
+
+ i = 0;
+ while (i < N_BUS_TYPES)
+ {
+ bus_connections[i] = NULL;
+ ++i;
+ }
+
+ /* Don't init these twice, we may run this code twice if
+ * init_connections_unlocked() fails midway through.
+ * In practice, each block below should contain only one
+ * "return FALSE" or running through twice may not
+ * work right.
+ */
+
+ if (bus_connection_addresses[DBUS_BUS_SYSTEM] == NULL)
+ {
+ _dbus_verbose ("Filling in system bus address...\n");
+
+ if (!get_from_env (&bus_connection_addresses[DBUS_BUS_SYSTEM],
+ "DBUS_SYSTEM_BUS_ADDRESS"))
+ return FALSE;
+ }
+
+
+ if (bus_connection_addresses[DBUS_BUS_SYSTEM] == NULL)
+ {
+ /* Use default system bus address if none set in environment */
+ bus_connection_addresses[DBUS_BUS_SYSTEM] =
+ _dbus_strdup (DBUS_SYSTEM_BUS_DEFAULT_ADDRESS);
+
+ if (bus_connection_addresses[DBUS_BUS_SYSTEM] == NULL)
+ return FALSE;
+
+ _dbus_verbose (" used default system bus \"%s\"\n",
+ bus_connection_addresses[DBUS_BUS_SYSTEM]);
+ }
+ else
+ _dbus_verbose (" used env var system bus \"%s\"\n",
+ bus_connection_addresses[DBUS_BUS_SYSTEM]);
+
+ if (bus_connection_addresses[DBUS_BUS_SESSION] == NULL)
+ {
+ _dbus_verbose ("Filling in session bus address...\n");
+
+ if (!get_from_env (&bus_connection_addresses[DBUS_BUS_SESSION],
+ "DBUS_SESSION_BUS_ADDRESS"))
+ return FALSE;
+
+ if (bus_connection_addresses[DBUS_BUS_SESSION] == NULL)
+ bus_connection_addresses[DBUS_BUS_SESSION] =
+ _dbus_strdup (DBUS_SESSION_BUS_DEFAULT_ADDRESS);
+
+ if (bus_connection_addresses[DBUS_BUS_SESSION] == NULL)
+ return FALSE;
+
+ _dbus_verbose (" \"%s\"\n", bus_connection_addresses[DBUS_BUS_SESSION] ?
+ bus_connection_addresses[DBUS_BUS_SESSION] : "none set");
+ }
+
+ if (bus_connection_addresses[DBUS_BUS_STARTER] == NULL)
+ {
+ _dbus_verbose ("Filling in activation bus address...\n");
+
+ if (!get_from_env (&bus_connection_addresses[DBUS_BUS_STARTER],
+ "DBUS_STARTER_ADDRESS"))
+ return FALSE;
+
+ _dbus_verbose (" \"%s\"\n", bus_connection_addresses[DBUS_BUS_STARTER] ?
+ bus_connection_addresses[DBUS_BUS_STARTER] : "none set");
+ }
+
+
+ if (bus_connection_addresses[DBUS_BUS_STARTER] != NULL)
+ {
+ s = _dbus_getenv ("DBUS_STARTER_BUS_TYPE");
+
+ if (s != NULL)
+ {
+ _dbus_verbose ("Bus activation type was set to \"%s\"\n", s);
+
+ if (strcmp (s, "system") == 0)
+ activation_bus_type = DBUS_BUS_SYSTEM;
+ else if (strcmp (s, "session") == 0)
+ activation_bus_type = DBUS_BUS_SESSION;
+ }
+ }
+ else
+ {
+ /* Default to the session bus instead if available */
+ if (bus_connection_addresses[DBUS_BUS_SESSION] != NULL)
+ {
+ bus_connection_addresses[DBUS_BUS_STARTER] =
+ _dbus_strdup (bus_connection_addresses[DBUS_BUS_SESSION]);
+ if (bus_connection_addresses[DBUS_BUS_STARTER] == NULL)
+ return FALSE;
+ }
+ }
+
+ /* If we return FALSE we have to be sure that restarting
+ * the above code will work right
+ */
+
+ if (!_dbus_setenv ("DBUS_ACTIVATION_ADDRESS", NULL))
+ return FALSE;
+
+ if (!_dbus_setenv ("DBUS_ACTIVATION_BUS_TYPE", NULL))
+ return FALSE;
+
+ if (!_dbus_register_shutdown_func (addresses_shutdown_func,
+ NULL))
+ return FALSE;
+
+ initialized = TRUE;
+ }
+
+ return initialized;
+}
+
+static void
+bus_data_free (void *data)
+{
+ BusData *bd = data;
+
+ if (bd->is_well_known)
+ {
+ int i;
+ _DBUS_LOCK (bus);
+ /* We may be stored in more than one slot */
+ /* This should now be impossible - these slots are supposed to
+ * be cleared on disconnect, so should not need to be cleared on
+ * finalize
+ */
+ i = 0;
+ while (i < N_BUS_TYPES)
+ {
+ if (bus_connections[i] == bd->connection)
+ bus_connections[i] = NULL;
+
+ ++i;
+ }
+ _DBUS_UNLOCK (bus);
+ }
+
+ dbus_free (bd->unique_name);
+ dbus_free (bd);
+
+ dbus_connection_free_data_slot (&bus_data_slot);
+}
+
+static BusData*
+ensure_bus_data (DBusConnection *connection)
+{
+ BusData *bd;
+
+ if (!dbus_connection_allocate_data_slot (&bus_data_slot))
+ return NULL;
+
+ bd = dbus_connection_get_data (connection, bus_data_slot);
+ if (bd == NULL)
+ {
+ bd = dbus_new0 (BusData, 1);
+ if (bd == NULL)
+ {
+ dbus_connection_free_data_slot (&bus_data_slot);
+ return NULL;
+ }
+
+ bd->connection = connection;
+
+ if (!dbus_connection_set_data (connection, bus_data_slot, bd,
+ bus_data_free))
+ {
+ dbus_free (bd);
+ dbus_connection_free_data_slot (&bus_data_slot);
+ return NULL;
+ }
+
+ /* Data slot refcount now held by the BusData */
+ }
+ else
+ {
+ dbus_connection_free_data_slot (&bus_data_slot);
+ }
+
+ return bd;
+}
+
+/**
+ * Internal function that checks to see if this
+ * is a shared connection owned by the bus and if it is unref it.
+ *
+ * @param connection a connection that has been disconnected.
+ */
+void
+_dbus_bus_notify_shared_connection_disconnected_unlocked (DBusConnection *connection)
+{
+ int i;
+
+ _DBUS_LOCK (bus);
+
+ /* We are expecting to have the connection saved in only one of these
+ * slots, but someone could in a pathological case set system and session
+ * bus to the same bus or something. Or set one of them to the starter
+ * bus without setting the starter bus type in the env variable.
+ * So we don't break the loop as soon as we find a match.
+ */
+ for (i = 0; i < N_BUS_TYPES; ++i)
+ {
+ if (bus_connections[i] == connection)
+ {
+ bus_connections[i] = NULL;
+ }
+ }
+
+ _DBUS_UNLOCK (bus);
+}
+
+static DBusConnection *
+internal_bus_get (DBusBusType type,
+ dbus_bool_t private,
+ DBusError *error)
+{
+ const char *address;
+ DBusConnection *connection;
+ BusData *bd;
+ DBusBusType address_type;
+
+ _dbus_return_val_if_fail (type >= 0 && type < N_BUS_TYPES, NULL);
+ _dbus_return_val_if_error_is_set (error, NULL);
+
+ _DBUS_LOCK (bus);
+
+ if (!init_connections_unlocked ())
+ {
+ _DBUS_UNLOCK (bus);
+ _DBUS_SET_OOM (error);
+ return NULL;
+ }
+
+ /* We want to use the activation address even if the
+ * activating bus is the session or system bus,
+ * per the spec.
+ */
+ address_type = type;
+
+ /* Use the real type of the activation bus for getting its
+ * connection, but only if the real type's address is available. (If
+ * the activating bus isn't a well-known bus then
+ * activation_bus_type == DBUS_BUS_STARTER)
+ */
+ if (type == DBUS_BUS_STARTER &&
+ bus_connection_addresses[activation_bus_type] != NULL)
+ type = activation_bus_type;
+
+ if (!private && bus_connections[type] != NULL)
+ {
+ connection = bus_connections[type];
+ dbus_connection_ref (connection);
+
+ _DBUS_UNLOCK (bus);
+ return connection;
+ }
+
+ address = bus_connection_addresses[address_type];
+ if (address == NULL)
+ {
+ dbus_set_error (error, DBUS_ERROR_FAILED,
+ "Unable to determine the address of the message bus (try 'man dbus-launch' and 'man dbus-daemon' for help)");
+ _DBUS_UNLOCK (bus);
+ return NULL;
+ }
+
+ if (private)
+ connection = dbus_connection_open_private (address, error);
+ else
+ connection = dbus_connection_open (address, error);
+
+ if (!connection)
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ _DBUS_UNLOCK (bus);
+ return NULL;
+ }
+
+ if (!dbus_bus_register (connection, error))
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ _dbus_connection_close_possibly_shared (connection);
+ dbus_connection_unref (connection);
+
+ _DBUS_UNLOCK (bus);
+ return NULL;
+ }
+
+ if (!private)
+ {
+ /* store a weak ref to the connection (dbus-connection.c is
+ * supposed to have a strong ref that it drops on disconnect,
+ * since this is a shared connection)
+ */
+ bus_connections[type] = connection;
+ }
+
+ /* By default we're bound to the lifecycle of
+ * the message bus.
+ */
+ dbus_connection_set_exit_on_disconnect (connection,
+ TRUE);
+
+ _DBUS_LOCK (bus_datas);
+ bd = ensure_bus_data (connection);
+ _dbus_assert (bd != NULL); /* it should have been created on
+ register, so OOM not possible */
+ bd->is_well_known = TRUE;
+ _DBUS_UNLOCK (bus_datas);
+
+
+ _DBUS_UNLOCK (bus);
+
+ /* Return a reference to the caller */
+ return connection;
+}
+
+
+/** @} */ /* end of implementation details docs */
+
+/**
+ * @addtogroup DBusBus
+ * @{
+ */
+
+/**
+ * Connects to a bus daemon and registers the client with it. If a
+ * connection to the bus already exists, then that connection is
+ * returned. The caller of this function owns a reference to the bus.
+ *
+ * The caller may NOT call dbus_connection_close() on this connection;
+ * see dbus_connection_open() and dbus_connection_close() for details
+ * on that.
+ *
+ * If this function obtains a new connection object never before
+ * returned from dbus_bus_get(), it will call
+ * dbus_connection_set_exit_on_disconnect(), so the application
+ * will exit if the connection closes. You can undo this
+ * by calling dbus_connection_set_exit_on_disconnect() yourself
+ * after you get the connection.
+ *
+ * dbus_bus_get() calls dbus_bus_register() for you.
+ *
+ * If returning a newly-created connection, this function will block
+ * until authentication and bus registration are complete.
+ *
+ * @param type bus type
+ * @param error address where an error can be returned.
+ * @returns a #DBusConnection with new ref
+ */
+DBusConnection *
+dbus_bus_get (DBusBusType type,
+ DBusError *error)
+{
+ return internal_bus_get (type, FALSE, error);
+}
+
+/**
+ * Connects to a bus daemon and registers the client with it as with
+ * dbus_bus_register(). Unlike dbus_bus_get(), always creates a new
+ * connection. This connection will not be saved or recycled by
+ * libdbus. Caller owns a reference to the bus and must either close
+ * it or know it to be closed prior to releasing this reference.
+ *
+ * See dbus_connection_open_private() for more details on when to
+ * close and unref this connection.
+ *
+ * This function calls
+ * dbus_connection_set_exit_on_disconnect() on the new connection, so the application
+ * will exit if the connection closes. You can undo this
+ * by calling dbus_connection_set_exit_on_disconnect() yourself
+ * after you get the connection.
+ *
+ * dbus_bus_get_private() calls dbus_bus_register() for you.
+ *
+ * This function will block until authentication and bus registration
+ * are complete.
+ *
+ * @param type bus type
+ * @param error address where an error can be returned.
+ * @returns a DBusConnection with new ref
+ */
+DBusConnection *
+dbus_bus_get_private (DBusBusType type,
+ DBusError *error)
+{
+ return internal_bus_get (type, TRUE, error);
+}
+
+/**
+ * Registers a connection with the bus. This must be the first
+ * thing an application does when connecting to the message bus.
+ * If registration succeeds, the unique name will be set,
+ * and can be obtained using dbus_bus_get_unique_name().
+ *
+ * This function will block until registration is complete.
+ *
+ * If the connection has already registered with the bus
+ * (determined by checking whether dbus_bus_get_unique_name()
+ * returns a non-#NULL value), then this function does nothing.
+ *
+ * If you use dbus_bus_get() or dbus_bus_get_private() this
+ * function will be called for you.
+ *
+ * @note Just use dbus_bus_get() or dbus_bus_get_private() instead of
+ * dbus_bus_register() and save yourself some pain. Using
+ * dbus_bus_register() manually is only useful if you have your
+ * own custom message bus not found in #DBusBusType.
+ *
+ * If you open a bus connection with dbus_connection_open() or
+ * dbus_connection_open_private() you will have to dbus_bus_register()
+ * yourself, or make the appropriate registration method calls
+ * yourself. If you send the method calls yourself, call
+ * dbus_bus_set_unique_name() with the unique bus name you get from
+ * the bus.
+ *
+ * For shared connections (created with dbus_connection_open()) in a
+ * multithreaded application, you can't really make the registration
+ * calls yourself, because you don't know whether some other thread is
+ * also registering, and the bus will kick you off if you send two
+ * registration messages.
+ *
+ * If you use dbus_bus_register() however, there is a lock that
+ * keeps both apps from registering at the same time.
+ *
+ * The rule in a multithreaded app, then, is that dbus_bus_register()
+ * must be used to register, or you need to have your own locks that
+ * all threads in the app will respect.
+ *
+ * In a single-threaded application you can register by hand instead
+ * of using dbus_bus_register(), as long as you check
+ * dbus_bus_get_unique_name() to see if a unique name has already been
+ * stored by another thread before you send the registration messages.
+ *
+ * @param connection the connection
+ * @param error place to store errors
+ * @returns #TRUE on success
+ */
+dbus_bool_t
+dbus_bus_register (DBusConnection *connection,
+ DBusError *error)
+{
+ DBusMessage *message, *reply;
+ char *name;
+ BusData *bd;
+ dbus_bool_t retval;
+
+ _dbus_return_val_if_fail (connection != NULL, FALSE);
+ _dbus_return_val_if_error_is_set (error, FALSE);
+
+ retval = FALSE;
+
+ _DBUS_LOCK (bus_datas);
+
+ bd = ensure_bus_data (connection);
+ if (bd == NULL)
+ {
+ _DBUS_SET_OOM (error);
+ _DBUS_UNLOCK (bus_datas);
+ return FALSE;
+ }
+
+ if (bd->unique_name != NULL)
+ {
+ _dbus_verbose ("Ignoring attempt to register the same DBusConnection %s with the message bus a second time.\n",
+ bd->unique_name);
+ _DBUS_UNLOCK (bus_datas);
+
+ /* Success! */
+ return TRUE;
+ }
+
+ message = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
+ DBUS_PATH_DBUS,
+ DBUS_INTERFACE_DBUS,
+ "Hello");
+
+ if (!message)
+ {
+ _DBUS_SET_OOM (error);
+
+ _DBUS_UNLOCK (bus_datas);
+ return FALSE;
+ }
+
+ reply = dbus_connection_send_with_reply_and_block (connection, message, -1, error);
+
+ dbus_message_unref (message);
+
+ if (reply == NULL)
+ goto out;
+ else if (dbus_set_error_from_message (error, reply))
+ goto out;
+ else if (!dbus_message_get_args (reply, error,
+ DBUS_TYPE_STRING, &name,
+ DBUS_TYPE_INVALID))
+ goto out;
+
+ bd->unique_name = _dbus_strdup (name);
+ if (bd->unique_name == NULL)
+ {
+ _DBUS_SET_OOM (error);
+ goto out;
+ }
+
+ retval = TRUE;
+
+ out:
+ if (reply)
+ dbus_message_unref (reply);
+
+ if (!retval)
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+
+ _DBUS_UNLOCK (bus_datas);
+
+ return retval;
+}
+
+
+/**
+ * Sets the unique name of the connection, as assigned by the message
+ * bus. Can only be used if you registered with the bus manually
+ * (i.e. if you did not call dbus_bus_register()). Can only be called
+ * once per connection. After the unique name is set, you can get it
+ * with dbus_bus_get_unique_name().
+ *
+ * The only reason to use this function is to re-implement the
+ * equivalent of dbus_bus_register() yourself. One (probably unusual)
+ * reason to do that might be to do the bus registration call
+ * asynchronously instead of synchronously.
+ *
+ * @note Just use dbus_bus_get() or dbus_bus_get_private(), or worst
+ * case dbus_bus_register(), instead of messing with this
+ * function. There's really no point creating pain for yourself by
+ * doing things manually.
+ *
+ * It's hard to use this function safely on shared connections
+ * (created by dbus_connection_open()) in a multithreaded application,
+ * because only one registration attempt can be sent to the bus. If
+ * two threads are both sending the registration message, there is no
+ * mechanism in libdbus itself to avoid sending it twice.
+ *
+ * Thus, you need a way to coordinate which thread sends the
+ * registration attempt; which also means you know which thread
+ * will call dbus_bus_set_unique_name(). If you don't know
+ * about all threads in the app (for example, if some libraries
+ * you're using might start libdbus-using threads), then you
+ * need to avoid using this function on shared connections.
+ *
+ * @param connection the connection
+ * @param unique_name the unique name
+ * @returns #FALSE if not enough memory
+ */
+dbus_bool_t
+dbus_bus_set_unique_name (DBusConnection *connection,
+ const char *unique_name)
+{
+ BusData *bd;
+ dbus_bool_t success;
+
+ _dbus_return_val_if_fail (connection != NULL, FALSE);
+ _dbus_return_val_if_fail (unique_name != NULL, FALSE);
+
+ _DBUS_LOCK (bus_datas);
+
+ bd = ensure_bus_data (connection);
+ if (bd == NULL)
+ return FALSE;
+
+ _dbus_assert (bd->unique_name == NULL);
+
+ bd->unique_name = _dbus_strdup (unique_name);
+ success = bd->unique_name != NULL;
+
+ _DBUS_UNLOCK (bus_datas);
+
+ return success;
+}
+
+/**
+ * Gets the unique name of the connection as assigned by the message
+ * bus. Only possible after the connection has been registered with
+ * the message bus. All connections returned by dbus_bus_get() or
+ * dbus_bus_get_private() have been successfully registered.
+ *
+ * The name remains valid until the connection is freed, and
+ * should not be freed by the caller.
+ *
+ * Other than dbus_bus_get(), there are two ways to set the unique
+ * name; one is dbus_bus_register(), the other is
+ * dbus_bus_set_unique_name(). You are responsible for calling
+ * dbus_bus_set_unique_name() if you register by hand instead of using
+ * dbus_bus_register().
+ *
+ * @param connection the connection
+ * @returns the unique name or #NULL on error
+ */
+const char*
+dbus_bus_get_unique_name (DBusConnection *connection)
+{
+ BusData *bd;
+ const char *unique_name;
+
+ _dbus_return_val_if_fail (connection != NULL, NULL);
+
+ _DBUS_LOCK (bus_datas);
+
+ bd = ensure_bus_data (connection);
+ if (bd == NULL)
+ return NULL;
+
+ unique_name = bd->unique_name;
+
+ _DBUS_UNLOCK (bus_datas);
+
+ return unique_name;
+}
+
+/**
+ * Asks the bus to return the UID the named connection authenticated
+ * as, if any. Only works on UNIX; only works for connections on the
+ * same machine as the bus. If you are not on the same machine as the
+ * bus, then calling this is probably a bad idea, since the UID will
+ * mean little to your application.
+ *
+ * For the system message bus you're guaranteed to be on the same
+ * machine since it only listens on a UNIX domain socket (at least,
+ * as shipped by default).
+ *
+ * This function only works for connections that authenticated as
+ * a UNIX user, right now that includes all bus connections, but
+ * it's very possible to have connections with no associated UID.
+ * So check for errors and do something sensible if they happen.
+ *
+ * This function will always return an error on Windows.
+ *
+ * @param connection the connection
+ * @param name a name owned by the connection
+ * @param error location to store the error
+ * @returns the unix user id, or ((unsigned)-1) if error is set
+ */
+unsigned long
+dbus_bus_get_unix_user (DBusConnection *connection,
+ const char *name,
+ DBusError *error)
+{
+ DBusMessage *message, *reply;
+ dbus_uint32_t uid;
+
+ _dbus_return_val_if_fail (connection != NULL, DBUS_UID_UNSET);
+ _dbus_return_val_if_fail (name != NULL, DBUS_UID_UNSET);
+ _dbus_return_val_if_fail (_dbus_check_is_valid_bus_name (name), DBUS_UID_UNSET);
+ _dbus_return_val_if_error_is_set (error, DBUS_UID_UNSET);
+
+ message = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
+ DBUS_PATH_DBUS,
+ DBUS_INTERFACE_DBUS,
+ "GetConnectionUnixUser");
+
+ if (message == NULL)
+ {
+ _DBUS_SET_OOM (error);
+ return DBUS_UID_UNSET;
+ }
+
+ if (!dbus_message_append_args (message,
+ DBUS_TYPE_STRING, &name,
+ DBUS_TYPE_INVALID))
+ {
+ dbus_message_unref (message);
+ _DBUS_SET_OOM (error);
+ return DBUS_UID_UNSET;
+ }
+
+ reply = dbus_connection_send_with_reply_and_block (connection, message, -1,
+ error);
+
+ dbus_message_unref (message);
+
+ if (reply == NULL)
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ return DBUS_UID_UNSET;
+ }
+
+ if (dbus_set_error_from_message (error, reply))
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ dbus_message_unref (reply);
+ return DBUS_UID_UNSET;
+ }
+
+ if (!dbus_message_get_args (reply, error,
+ DBUS_TYPE_UINT32, &uid,
+ DBUS_TYPE_INVALID))
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ dbus_message_unref (reply);
+ return DBUS_UID_UNSET;
+ }
+
+ dbus_message_unref (reply);
+
+ return (unsigned long) uid;
+}
+
+/**
+ * Asks the bus to return its globally unique ID, as described in the
+ * D-Bus specification. For the session bus, this is useful as a way
+ * to uniquely identify each user session. For the system bus,
+ * probably the bus ID is not useful; instead, use the machine ID
+ * since it's accessible without necessarily connecting to the bus and
+ * may be persistent beyond a single bus instance (across reboots for
+ * example). See dbus_get_local_machine_id().
+ *
+ * In addition to an ID for each bus and an ID for each machine, there is
+ * an ID for each address that the bus is listening on; that can
+ * be retrieved with dbus_connection_get_server_id(), though it is
+ * probably not very useful.
+ *
+ * @param connection the connection
+ * @param error location to store the error
+ * @returns the bus ID or #NULL if error is set
+ */
+char*
+dbus_bus_get_id (DBusConnection *connection,
+ DBusError *error)
+{
+ DBusMessage *message, *reply;
+ char *id;
+ const char *v_STRING;
+
+ _dbus_return_val_if_fail (connection != NULL, NULL);
+ _dbus_return_val_if_error_is_set (error, NULL);
+
+ message = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
+ DBUS_PATH_DBUS,
+ DBUS_INTERFACE_DBUS,
+ "GetId");
+
+ if (message == NULL)
+ {
+ _DBUS_SET_OOM (error);
+ return NULL;
+ }
+
+ reply = dbus_connection_send_with_reply_and_block (connection, message, -1,
+ error);
+
+ dbus_message_unref (message);
+
+ if (reply == NULL)
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ return NULL;
+ }
+
+ if (dbus_set_error_from_message (error, reply))
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ dbus_message_unref (reply);
+ return NULL;
+ }
+
+ v_STRING = NULL;
+ if (!dbus_message_get_args (reply, error,
+ DBUS_TYPE_STRING, &v_STRING,
+ DBUS_TYPE_INVALID))
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ dbus_message_unref (reply);
+ return NULL;
+ }
+
+ id = _dbus_strdup (v_STRING); /* may be NULL */
+
+ dbus_message_unref (reply);
+
+ if (id == NULL)
+ _DBUS_SET_OOM (error);
+
+ /* FIXME it might be nice to cache the ID locally */
+
+ return id;
+}
+
+/**
+ * Asks the bus to assign the given name to this connection by invoking
+ * the RequestName method on the bus. This method is fully documented
+ * in the D-Bus specification. For quick reference, the flags and
+ * result codes are discussed here, but the specification is the
+ * canonical version of this information.
+ *
+ * First you should know that for each bus name, the bus stores
+ * a queue of connections that would like to own it. Only
+ * one owns it at a time - called the primary owner. If the primary
+ * owner releases the name or disconnects, then the next owner in the
+ * queue atomically takes over.
+ *
+ * So for example if you have an application org.freedesktop.TextEditor
+ * and multiple instances of it can be run, you can have all of them
+ * sitting in the queue. The first one to start up will receive messages
+ * sent to org.freedesktop.TextEditor, but if that one exits another
+ * will become the primary owner and receive messages.
+ *
+ * The queue means you don't need to manually watch for the current owner to
+ * disappear and then request the name again.
+ *
+ * When requesting a name, you can specify several flags.
+ *
+ * #DBUS_NAME_FLAG_ALLOW_REPLACEMENT and #DBUS_NAME_FLAG_DO_NOT_QUEUE
+ * are properties stored by the bus for this connection with respect to
+ * each requested bus name. These properties are stored even if the
+ * connection is queued and does not become the primary owner.
+ * You can update these flags by calling RequestName again (even if
+ * you already own the name).
+ *
+ * #DBUS_NAME_FLAG_ALLOW_REPLACEMENT means that another requestor of the
+ * name can take it away from you by specifying #DBUS_NAME_FLAG_REPLACE_EXISTING.
+ *
+ * #DBUS_NAME_FLAG_DO_NOT_QUEUE means that if you aren't the primary owner,
+ * you don't want to be queued up - you only care about being the
+ * primary owner.
+ *
+ * Unlike the other two flags, #DBUS_NAME_FLAG_REPLACE_EXISTING is a property
+ * of the individual RequestName call, i.e. the bus does not persistently
+ * associate it with the connection-name pair. If a RequestName call includes
+ * the #DBUS_NAME_FLAG_REPLACE_EXISTING flag, and the current primary
+ * owner has #DBUS_NAME_FLAG_ALLOW_REPLACEMENT set, then the current primary
+ * owner will be kicked off.
+ *
+ * If no flags are given, an application will receive the requested
+ * name only if the name is currently unowned; and it will NOT give
+ * up the name if another application asks to take it over using
+ * #DBUS_NAME_FLAG_REPLACE_EXISTING.
+ *
+ * This function returns a result code. The possible result codes
+ * are as follows.
+ *
+ * #DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER means that the name had no
+ * existing owner, and the caller is now the primary owner; or that
+ * the name had an owner, and the caller specified
+ * #DBUS_NAME_FLAG_REPLACE_EXISTING, and the current owner
+ * specified #DBUS_NAME_FLAG_ALLOW_REPLACEMENT.
+ *
+ * #DBUS_REQUEST_NAME_REPLY_IN_QUEUE happens only if the caller does NOT
+ * specify #DBUS_NAME_FLAG_DO_NOT_QUEUE and either the current owner
+ * did NOT specify #DBUS_NAME_FLAG_ALLOW_REPLACEMENT or the caller did NOT
+ * specify #DBUS_NAME_FLAG_REPLACE_EXISTING. In this case the caller ends up
+ * in a queue to own the name after the current owner gives it up.
+ *
+ * #DBUS_REQUEST_NAME_REPLY_EXISTS happens if the name has an owner
+ * already and the caller specifies #DBUS_NAME_FLAG_DO_NOT_QUEUE
+ * and either the current owner has NOT specified
+ * #DBUS_NAME_FLAG_ALLOW_REPLACEMENT or the caller did NOT specify
+ * #DBUS_NAME_FLAG_REPLACE_EXISTING.
+ *
+ * #DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER happens if an application
+ * requests a name it already owns. (Re-requesting a name is useful if
+ * you want to change the #DBUS_NAME_FLAG_ALLOW_REPLACEMENT or
+ * #DBUS_NAME_FLAG_DO_NOT_QUEUE settings.)
+ *
+ * When a service represents an application, say "text editor," then
+ * it should specify #DBUS_NAME_FLAG_ALLOW_REPLACEMENT if it wants
+ * the last editor started to be the user's editor vs. the first one
+ * started. Then any editor that can be the user's editor should
+ * specify #DBUS_NAME_FLAG_REPLACE_EXISTING to either take over
+ * (last-started-wins) or be queued up (first-started-wins) according
+ * to whether #DBUS_NAME_FLAG_ALLOW_REPLACEMENT was given.
+ *
+ * Conventionally, single-instance applications often offer a command
+ * line option called --replace which means to replace the current
+ * instance. To implement this, always set
+ * #DBUS_NAME_FLAG_ALLOW_REPLACEMENT when you request your
+ * application's bus name. When you lose ownership of your bus name,
+ * you need to exit. Look for the signal "NameLost" from
+ * #DBUS_SERVICE_DBUS and #DBUS_INTERFACE_DBUS (the signal's first
+ * argument is the bus name that was lost). If starting up without
+ * --replace, do not specify #DBUS_NAME_FLAG_REPLACE_EXISTING, and
+ * exit if you fail to become the bus name owner. If --replace is
+ * given, ask to replace the old owner.
+ *
+ * @param connection the connection
+ * @param name the name to request
+ * @param flags flags
+ * @param error location to store the error
+ * @returns a result code, -1 if error is set
+ */
+int
+dbus_bus_request_name (DBusConnection *connection,
+ const char *name,
+ unsigned int flags,
+ DBusError *error)
+{
+ DBusMessage *message, *reply;
+ dbus_uint32_t result;
+
+ _dbus_return_val_if_fail (connection != NULL, 0);
+ _dbus_return_val_if_fail (name != NULL, 0);
+ _dbus_return_val_if_fail (_dbus_check_is_valid_bus_name (name), 0);
+ _dbus_return_val_if_error_is_set (error, 0);
+
+ message = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
+ DBUS_PATH_DBUS,
+ DBUS_INTERFACE_DBUS,
+ "RequestName");
+
+ if (message == NULL)
+ {
+ _DBUS_SET_OOM (error);
+ return -1;
+ }
+
+ if (!dbus_message_append_args (message,
+ DBUS_TYPE_STRING, &name,
+ DBUS_TYPE_UINT32, &flags,
+ DBUS_TYPE_INVALID))
+ {
+ dbus_message_unref (message);
+ _DBUS_SET_OOM (error);
+ return -1;
+ }
+
+ reply = dbus_connection_send_with_reply_and_block (connection, message, -1,
+ error);
+
+ dbus_message_unref (message);
+
+ if (reply == NULL)
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ return -1;
+ }
+
+ if (dbus_set_error_from_message (error, reply))
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ dbus_message_unref (reply);
+ return -1;
+ }
+
+ if (!dbus_message_get_args (reply, error,
+ DBUS_TYPE_UINT32, &result,
+ DBUS_TYPE_INVALID))
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ dbus_message_unref (reply);
+ return -1;
+ }
+
+ dbus_message_unref (reply);
+
+ return result;
+}
+
+
+/**
+ * Asks the bus to unassign the given name from this connection by
+ * invoking the ReleaseName method on the bus. The "ReleaseName"
+ * method is canonically documented in the D-Bus specification.
+ *
+ * Possible results are: #DBUS_RELEASE_NAME_REPLY_RELEASED
+ * which means you owned the name or were in the queue to own it,
+ * and and now you don't own it and aren't in the queue.
+ * #DBUS_RELEASE_NAME_REPLY_NOT_OWNER which means someone else
+ * owns the name so you can't release it.
+ * #DBUS_RELEASE_NAME_REPLY_NON_EXISTENT
+ * which means nobody owned the name.
+ *
+ * @param connection the connection
+ * @param name the name to remove
+ * @param error location to store the error
+ * @returns a result code, -1 if error is set
+ */
+int
+dbus_bus_release_name (DBusConnection *connection,
+ const char *name,
+ DBusError *error)
+{
+ DBusMessage *message, *reply;
+ dbus_uint32_t result;
+
+ _dbus_return_val_if_fail (connection != NULL, 0);
+ _dbus_return_val_if_fail (name != NULL, 0);
+ _dbus_return_val_if_fail (_dbus_check_is_valid_bus_name (name), 0);
+ _dbus_return_val_if_error_is_set (error, 0);
+
+ message = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
+ DBUS_PATH_DBUS,
+ DBUS_INTERFACE_DBUS,
+ "ReleaseName");
+
+ if (message == NULL)
+ {
+ _DBUS_SET_OOM (error);
+ return -1;
+ }
+
+ if (!dbus_message_append_args (message,
+ DBUS_TYPE_STRING, &name,
+ DBUS_TYPE_INVALID))
+ {
+ dbus_message_unref (message);
+ _DBUS_SET_OOM (error);
+ return -1;
+ }
+
+ reply = dbus_connection_send_with_reply_and_block (connection, message, -1,
+ error);
+
+ dbus_message_unref (message);
+
+ if (reply == NULL)
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ return -1;
+ }
+
+ if (dbus_set_error_from_message (error, reply))
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ dbus_message_unref (reply);
+ return -1;
+ }
+
+ if (!dbus_message_get_args (reply, error,
+ DBUS_TYPE_UINT32, &result,
+ DBUS_TYPE_INVALID))
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ dbus_message_unref (reply);
+ return -1;
+ }
+
+ dbus_message_unref (reply);
+
+ return result;
+}
+
+/**
+ * Asks the bus whether a certain name has an owner.
+ *
+ * Using this can easily result in a race condition,
+ * since an owner can appear or disappear after you
+ * call this.
+ *
+ * If you want to request a name, just request it;
+ * if you want to avoid replacing a current owner,
+ * don't specify #DBUS_NAME_FLAG_REPLACE_EXISTING and
+ * you will get an error if there's already an owner.
+ *
+ * @param connection the connection
+ * @param name the name
+ * @param error location to store any errors
+ * @returns #TRUE if the name exists, #FALSE if not or on error
+ */
+dbus_bool_t
+dbus_bus_name_has_owner (DBusConnection *connection,
+ const char *name,
+ DBusError *error)
+{
+ DBusMessage *message, *reply;
+ dbus_bool_t exists;
+
+ _dbus_return_val_if_fail (connection != NULL, FALSE);
+ _dbus_return_val_if_fail (name != NULL, FALSE);
+ _dbus_return_val_if_fail (_dbus_check_is_valid_bus_name (name), FALSE);
+ _dbus_return_val_if_error_is_set (error, FALSE);
+
+ message = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
+ DBUS_PATH_DBUS,
+ DBUS_INTERFACE_DBUS,
+ "NameHasOwner");
+ if (message == NULL)
+ {
+ _DBUS_SET_OOM (error);
+ return FALSE;
+ }
+
+ if (!dbus_message_append_args (message,
+ DBUS_TYPE_STRING, &name,
+ DBUS_TYPE_INVALID))
+ {
+ dbus_message_unref (message);
+ _DBUS_SET_OOM (error);
+ return FALSE;
+ }
+
+ reply = dbus_connection_send_with_reply_and_block (connection, message, -1, error);
+ dbus_message_unref (message);
+
+ if (reply == NULL)
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ return FALSE;
+ }
+
+ if (!dbus_message_get_args (reply, error,
+ DBUS_TYPE_BOOLEAN, &exists,
+ DBUS_TYPE_INVALID))
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ dbus_message_unref (reply);
+ return FALSE;
+ }
+
+ dbus_message_unref (reply);
+ return exists;
+}
+
+/**
+ * Starts a service that will request ownership of the given name.
+ * The returned result will be one of be one of
+ * #DBUS_START_REPLY_SUCCESS or #DBUS_START_REPLY_ALREADY_RUNNING if
+ * successful. Pass #NULL if you don't care about the result.
+ *
+ * The flags parameter is for future expansion, currently you should
+ * specify 0.
+ *
+ * It's often easier to avoid explicitly starting services, and
+ * just send a method call to the service's bus name instead.
+ * Method calls start a service to handle them by default
+ * unless you call dbus_message_set_auto_start() to disable this
+ * behavior.
+ *
+ * @param connection the connection
+ * @param name the name we want the new service to request
+ * @param flags the flags (should always be 0 for now)
+ * @param result a place to store the result or #NULL
+ * @param error location to store any errors
+ * @returns #TRUE if the activation succeeded, #FALSE if not
+ */
+dbus_bool_t
+dbus_bus_start_service_by_name (DBusConnection *connection,
+ const char *name,
+ dbus_uint32_t flags,
+ dbus_uint32_t *result,
+ DBusError *error)
+{
+ DBusMessage *msg;
+ DBusMessage *reply;
+
+ _dbus_return_val_if_fail (connection != NULL, FALSE);
+ _dbus_return_val_if_fail (_dbus_check_is_valid_bus_name (name), FALSE);
+
+ msg = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
+ DBUS_PATH_DBUS,
+ DBUS_INTERFACE_DBUS,
+ "StartServiceByName");
+
+ if (!dbus_message_append_args (msg, DBUS_TYPE_STRING, &name,
+ DBUS_TYPE_UINT32, &flags, DBUS_TYPE_INVALID))
+ {
+ dbus_message_unref (msg);
+ _DBUS_SET_OOM (error);
+ return FALSE;
+ }
+
+ reply = dbus_connection_send_with_reply_and_block (connection, msg,
+ -1, error);
+ dbus_message_unref (msg);
+
+ if (reply == NULL)
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ return FALSE;
+ }
+
+ if (dbus_set_error_from_message (error, reply))
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ dbus_message_unref (reply);
+ return FALSE;
+ }
+
+ if (result != NULL &&
+ !dbus_message_get_args (reply, error, DBUS_TYPE_UINT32,
+ result, DBUS_TYPE_INVALID))
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ dbus_message_unref (reply);
+ return FALSE;
+ }
+
+ dbus_message_unref (reply);
+ return TRUE;
+}
+
+static void
+send_no_return_values (DBusConnection *connection,
+ DBusMessage *msg,
+ DBusError *error)
+{
+ if (error)
+ {
+ /* Block to check success codepath */
+ DBusMessage *reply;
+
+ reply = dbus_connection_send_with_reply_and_block (connection, msg,
+ -1, error);
+
+ if (reply == NULL)
+ _DBUS_ASSERT_ERROR_IS_SET (error);
+ else
+ dbus_message_unref (reply);
+ }
+ else
+ {
+ /* Silently-fail nonblocking codepath */
+ dbus_message_set_no_reply (msg, TRUE);
+ dbus_connection_send (connection, msg, NULL);
+ }
+}
+
+/**
+ * Adds a match rule to match messages going through the message bus.
+ * The "rule" argument is the string form of a match rule.
+ *
+ * If you pass #NULL for the error, this function will not
+ * block; the match thus won't be added until you flush the
+ * connection, and if there's an error adding the match
+ * (only possible error is lack of resources in the bus),
+ * you won't find out about it.
+ *
+ * If you pass non-#NULL for the error this function will
+ * block until it gets a reply.
+ *
+ * Normal API conventions would have the function return
+ * a boolean value indicating whether the error was set,
+ * but that would require blocking always to determine
+ * the return value.
+ *
+ * The AddMatch method is fully documented in the D-Bus
+ * specification. For quick reference, the format of the
+ * match rules is discussed here, but the specification
+ * is the canonical version of this information.
+ *
+ * Rules are specified as a string of comma separated
+ * key/value pairs. An example is
+ * "type='signal',sender='org.freedesktop.DBus',
+ * interface='org.freedesktop.DBus',member='Foo',
+ * path='/bar/foo',destination=':452345.34'"
+ *
+ * Possible keys you can match on are type, sender,
+ * interface, member, path, destination and numbered
+ * keys to match message args (keys are 'arg0', 'arg1', etc.).
+ * Omitting a key from the rule indicates
+ * a wildcard match. For instance omitting
+ * the member from a match rule but adding a sender would
+ * let all messages from that sender through regardless of
+ * the member.
+ *
+ * Matches are inclusive not exclusive so as long as one
+ * rule matches the message will get through. It is important
+ * to note this because every time a message is received the
+ * application will be paged into memory to process it. This
+ * can cause performance problems such as draining batteries
+ * on embedded platforms.
+ *
+ * If you match message args ('arg0', 'arg1', and so forth)
+ * only string arguments will match. That is, arg0='5' means
+ * match the string "5" not the integer 5.
+ *
+ * Currently there is no way to match against non-string arguments.
+ *
+ * A specialised form of wildcard matching on arguments is
+ * supported for path-like namespaces. If your argument match has
+ * a 'path' suffix (eg: "arg0path='/some/path/'") then it is
+ * considered a match if the argument exactly matches the given
+ * string or if one of them ends in a '/' and is a prefix of the
+ * other.
+ *
+ * Matching on interface is tricky because method call
+ * messages only optionally specify the interface.
+ * If a message omits the interface, then it will NOT match
+ * if the rule specifies an interface name. This means match
+ * rules on method calls should not usually give an interface.
+ *
+ * However, signal messages are required to include the interface
+ * so when matching signals usually you should specify the interface
+ * in the match rule.
+ *
+ * For security reasons, you can match arguments only up to
+ * #DBUS_MAXIMUM_MATCH_RULE_ARG_NUMBER.
+ *
+ * Match rules have a maximum length of #DBUS_MAXIMUM_MATCH_RULE_LENGTH
+ * bytes.
+ *
+ * Both of these maximums are much higher than you're likely to need,
+ * they only exist because the D-Bus bus daemon has fixed limits on
+ * all resource usage.
+ *
+ * @param connection connection to the message bus
+ * @param rule textual form of match rule
+ * @param error location to store any errors
+ */
+void
+dbus_bus_add_match (DBusConnection *connection,
+ const char *rule,
+ DBusError *error)
+{
+ DBusMessage *msg;
+
+ _dbus_return_if_fail (rule != NULL);
+
+ msg = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
+ DBUS_PATH_DBUS,
+ DBUS_INTERFACE_DBUS,
+ "AddMatch");
+
+ if (msg == NULL)
+ {
+ _DBUS_SET_OOM (error);
+ return;
+ }
+
+ if (!dbus_message_append_args (msg, DBUS_TYPE_STRING, &rule,
+ DBUS_TYPE_INVALID))
+ {
+ dbus_message_unref (msg);
+ _DBUS_SET_OOM (error);
+ return;
+ }
+
+ send_no_return_values (connection, msg, error);
+
+ dbus_message_unref (msg);
+}
+
+/**
+ * Removes a previously-added match rule "by value" (the most
+ * recently-added identical rule gets removed). The "rule" argument
+ * is the string form of a match rule.
+ *
+ * The bus compares match rules semantically, not textually, so
+ * whitespace and ordering don't have to be identical to
+ * the rule you passed to dbus_bus_add_match().
+ *
+ * If you pass #NULL for the error, this function will not
+ * block; otherwise it will. See detailed explanation in
+ * docs for dbus_bus_add_match().
+ *
+ * @param connection connection to the message bus
+ * @param rule textual form of match rule
+ * @param error location to store any errors
+ */
+void
+dbus_bus_remove_match (DBusConnection *connection,
+ const char *rule,
+ DBusError *error)
+{
+ DBusMessage *msg;
+
+ _dbus_return_if_fail (rule != NULL);
+
+ msg = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
+ DBUS_PATH_DBUS,
+ DBUS_INTERFACE_DBUS,
+ "RemoveMatch");
+
+ if (!dbus_message_append_args (msg, DBUS_TYPE_STRING, &rule,
+ DBUS_TYPE_INVALID))
+ {
+ dbus_message_unref (msg);
+ _DBUS_SET_OOM (error);
+ return;
+ }
+
+ send_no_return_values (connection, msg, error);
+
+ dbus_message_unref (msg);
+}
+
+/** @} */
projects / monky / blobdiff