1 /* -*- mode: C; c-file-style: "gnu" -*- */
2 /* dbus-bus.c Convenience functions for communicating with the bus.
4 * Copyright (C) 2003 CodeFactory AB
5 * Copyright (C) 2003 Red Hat, Inc.
7 * Licensed under the Academic Free License version 2.1
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 #include "dbus-protocol.h"
27 #include "dbus-internals.h"
28 #include "dbus-message.h"
29 #include "dbus-marshal-validate.h"
30 #include "dbus-threads-internal.h"
34 * @defgroup DBusBus Message bus APIs
36 * @brief Functions for communicating with the message bus
38 * @todo right now the default address of the system bus is hardcoded,
39 * so if you change it in the global config file suddenly you have to
40 * set DBUS_SYSTEM_BUS_ADDRESS env variable. Might be nice if the
41 * client lib somehow read the config file, or if the bus on startup
42 * somehow wrote out its address to a well-known spot, but might also
47 * @defgroup DBusBusInternals Message bus APIs internals
48 * @ingroup DBusInternals
49 * @brief Internals of functions for communicating with the message bus
55 * Block of message-bus-related data we attach to each
56 * #DBusConnection used with these convenience functions.
61 DBusConnection *connection; /**< Connection we're associated with */
62 char *unique_name; /**< Unique name of this connection */
64 unsigned int is_well_known : 1; /**< Is one of the well-known connections in our global array */
67 /** The slot we have reserved to store BusData.
69 static dbus_int32_t bus_data_slot = -1;
71 /** Number of bus types */
74 static DBusConnection *bus_connections[N_BUS_TYPES];
75 static char *bus_connection_addresses[N_BUS_TYPES] = { NULL, NULL, NULL };
77 static DBusBusType activation_bus_type = DBUS_BUS_STARTER;
79 static dbus_bool_t initialized = FALSE;
82 * Lock for globals in this file
84 _DBUS_DEFINE_GLOBAL_LOCK (bus);
87 addresses_shutdown_func (void *data)
92 while (i < N_BUS_TYPES)
94 if (bus_connections[i] != NULL)
95 _dbus_warn ("dbus_shutdown() called but connections were still live!");
97 dbus_free (bus_connection_addresses[i]);
98 bus_connection_addresses[i] = NULL;
102 activation_bus_type = DBUS_BUS_STARTER;
106 get_from_env (char **connection_p,
111 _dbus_assert (*connection_p == NULL);
113 s = _dbus_getenv (env_var);
114 if (s == NULL || *s == '\0')
115 return TRUE; /* successfully didn't use the env var */
118 *connection_p = _dbus_strdup (s);
119 return *connection_p != NULL;
124 init_connections_unlocked (void)
132 while (i < N_BUS_TYPES)
134 bus_connections[i] = NULL;
138 /* Don't init these twice, we may run this code twice if
139 * init_connections_unlocked() fails midway through.
140 * In practice, each block below should contain only one
141 * "return FALSE" or running through twice may not
145 if (bus_connection_addresses[DBUS_BUS_SYSTEM] == NULL)
147 _dbus_verbose ("Filling in system bus address...\n");
149 if (!get_from_env (&bus_connection_addresses[DBUS_BUS_SYSTEM],
150 "DBUS_SYSTEM_BUS_ADDRESS"))
155 if (bus_connection_addresses[DBUS_BUS_SYSTEM] == NULL)
157 /* Use default system bus address if none set in environment */
158 bus_connection_addresses[DBUS_BUS_SYSTEM] =
159 _dbus_strdup (DBUS_SYSTEM_BUS_DEFAULT_ADDRESS);
160 if (bus_connection_addresses[DBUS_BUS_SYSTEM] == NULL)
163 _dbus_verbose (" used default system bus \"%s\"\n",
164 bus_connection_addresses[DBUS_BUS_SYSTEM]);
167 _dbus_verbose (" used env var system bus \"%s\"\n",
168 bus_connection_addresses[DBUS_BUS_SYSTEM]);
170 if (bus_connection_addresses[DBUS_BUS_SESSION] == NULL)
172 _dbus_verbose ("Filling in session bus address...\n");
174 if (!get_from_env (&bus_connection_addresses[DBUS_BUS_SESSION],
175 "DBUS_SESSION_BUS_ADDRESS"))
177 _dbus_verbose (" \"%s\"\n", bus_connection_addresses[DBUS_BUS_SESSION] ?
178 bus_connection_addresses[DBUS_BUS_SESSION] : "none set");
181 if (bus_connection_addresses[DBUS_BUS_STARTER] == NULL)
183 _dbus_verbose ("Filling in activation bus address...\n");
185 if (!get_from_env (&bus_connection_addresses[DBUS_BUS_STARTER],
186 "DBUS_STARTER_ADDRESS"))
189 _dbus_verbose (" \"%s\"\n", bus_connection_addresses[DBUS_BUS_STARTER] ?
190 bus_connection_addresses[DBUS_BUS_STARTER] : "none set");
194 if (bus_connection_addresses[DBUS_BUS_STARTER] != NULL)
196 s = _dbus_getenv ("DBUS_STARTER_BUS_TYPE");
200 _dbus_verbose ("Bus activation type was set to \"%s\"\n", s);
202 if (strcmp (s, "system") == 0)
203 activation_bus_type = DBUS_BUS_SYSTEM;
204 else if (strcmp (s, "session") == 0)
205 activation_bus_type = DBUS_BUS_SESSION;
210 /* Default to the session bus instead if available */
211 if (bus_connection_addresses[DBUS_BUS_SESSION] != NULL)
213 bus_connection_addresses[DBUS_BUS_STARTER] =
214 _dbus_strdup (bus_connection_addresses[DBUS_BUS_SESSION]);
215 if (bus_connection_addresses[DBUS_BUS_STARTER] == NULL)
220 /* If we return FALSE we have to be sure that restarting
221 * the above code will work right
224 if (!_dbus_setenv ("DBUS_ACTIVATION_ADDRESS", NULL))
227 if (!_dbus_setenv ("DBUS_ACTIVATION_BUS_TYPE", NULL))
230 if (!_dbus_register_shutdown_func (addresses_shutdown_func,
241 bus_data_free (void *data)
245 if (bd->is_well_known)
249 /* We may be stored in more than one slot */
251 while (i < N_BUS_TYPES)
253 if (bus_connections[i] == bd->connection)
254 bus_connections[i] = NULL;
261 dbus_free (bd->unique_name);
264 dbus_connection_free_data_slot (&bus_data_slot);
268 ensure_bus_data (DBusConnection *connection)
272 if (!dbus_connection_allocate_data_slot (&bus_data_slot))
275 bd = dbus_connection_get_data (connection, bus_data_slot);
278 bd = dbus_new0 (BusData, 1);
281 dbus_connection_free_data_slot (&bus_data_slot);
285 bd->connection = connection;
287 if (!dbus_connection_set_data (connection, bus_data_slot, bd,
291 dbus_connection_free_data_slot (&bus_data_slot);
295 /* Data slot refcount now held by the BusData */
299 dbus_connection_free_data_slot (&bus_data_slot);
305 static DBusConnection *
306 internal_bus_get (DBusBusType type,
307 DBusError *error, dbus_bool_t private)
310 DBusConnection *connection;
312 DBusBusType address_type;
314 _dbus_return_val_if_fail (type >= 0 && type < N_BUS_TYPES, NULL);
315 _dbus_return_val_if_error_is_set (error, NULL);
319 if (!init_connections_unlocked ())
322 _DBUS_SET_OOM (error);
326 /* We want to use the activation address even if the
327 * activating bus is the session or system bus,
332 /* Use the real type of the activation bus for getting its
333 * connection, but only if the real type's address is available. (If
334 * the activating bus isn't a well-known bus then
335 * activation_bus_type == DBUS_BUS_STARTER)
337 if (type == DBUS_BUS_STARTER &&
338 bus_connection_addresses[activation_bus_type] != NULL)
339 type = activation_bus_type;
341 if (!private && bus_connections[type] != NULL)
343 connection = bus_connections[type];
344 dbus_connection_ref (connection);
350 address = bus_connection_addresses[address_type];
353 dbus_set_error (error, DBUS_ERROR_FAILED,
354 "Unable to determine the address of the message bus");
360 connection = dbus_connection_open_private(address, error);
362 connection = dbus_connection_open (address, error);
366 _DBUS_ASSERT_ERROR_IS_SET (error);
371 /* By default we're bound to the lifecycle of
374 dbus_connection_set_exit_on_disconnect (connection,
377 if (!dbus_bus_register (connection, error))
379 _DBUS_ASSERT_ERROR_IS_SET (error);
380 dbus_connection_close (connection);
381 dbus_connection_unref (connection);
388 bus_connections[type] = connection;
390 bd = ensure_bus_data (connection);
391 _dbus_assert (bd != NULL);
393 bd->is_well_known = TRUE;
400 /** @} */ /* end of implementation details docs */
403 * @addtogroup DBusBus
408 * Connects to a bus daemon and registers the client with it. If a
409 * connection to the bus already exists, then that connection is
410 * returned. Caller owns a reference to the bus.
412 * @todo alex thinks we should nullify the connection when we get a disconnect-message.
414 * @param type bus type
415 * @param error address where an error can be returned.
416 * @returns a DBusConnection with new ref
419 dbus_bus_get (DBusBusType type,
421 return internal_bus_get(type, error, FALSE);
425 * Connects to a bus daemon and registers the client with it. Unlike
426 * dbus_bus_get(), always creates a new connection. This connection
427 * will not be saved or recycled by libdbus. Caller owns a reference
430 * @param type bus type
431 * @param error address where an error can be returned.
432 * @returns a DBusConnection with new ref
435 dbus_bus_get_private (DBusBusType type,
437 return internal_bus_get(type, error, TRUE);
441 * Registers a connection with the bus. This must be the first
442 * thing an application does when connecting to the message bus.
443 * If registration succeeds, the unique name will be set,
444 * and can be obtained using dbus_bus_get_unique_name().
446 * @param connection the connection
447 * @param error place to store errors
448 * @returns #TRUE on success
451 dbus_bus_register (DBusConnection *connection,
454 DBusMessage *message, *reply;
459 _dbus_return_val_if_fail (connection != NULL, FALSE);
460 _dbus_return_val_if_error_is_set (error, FALSE);
464 bd = ensure_bus_data (connection);
467 _DBUS_SET_OOM (error);
471 if (bd->unique_name != NULL)
473 _dbus_warn ("Attempt to register the same DBusConnection with the message bus, but it is already registered\n");
474 /* This isn't an error, it's a programming bug. We'll be nice
475 * and not _dbus_assert_not_reached()
480 message = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
487 _DBUS_SET_OOM (error);
491 reply = dbus_connection_send_with_reply_and_block (connection, message, -1, error);
493 dbus_message_unref (message);
497 else if (dbus_set_error_from_message (error, reply))
499 else if (!dbus_message_get_args (reply, error,
500 DBUS_TYPE_STRING, &name,
504 bd->unique_name = _dbus_strdup (name);
505 if (bd->unique_name == NULL)
507 _DBUS_SET_OOM (error);
515 dbus_message_unref (reply);
518 _DBUS_ASSERT_ERROR_IS_SET (error);
525 * Sets the unique name of the connection. Can only be used if you
526 * registered with the bus manually (i.e. if you did not call
527 * dbus_bus_register()). Can only be called once per connection.
529 * @param connection the connection
530 * @param unique_name the unique name
531 * @returns #FALSE if not enough memory
534 dbus_bus_set_unique_name (DBusConnection *connection,
535 const char *unique_name)
539 _dbus_return_val_if_fail (connection != NULL, FALSE);
540 _dbus_return_val_if_fail (unique_name != NULL, FALSE);
542 bd = ensure_bus_data (connection);
546 _dbus_assert (bd->unique_name == NULL);
548 bd->unique_name = _dbus_strdup (unique_name);
549 return bd->unique_name != NULL;
553 * Gets the unique name of the connection. Only possible after the
554 * connection has been registered with the message bus.
556 * The name remains valid for the duration of the connection and
557 * should not be freed by the caller.
559 * @param connection the connection
560 * @returns the unique name or NULL on error
563 dbus_bus_get_unique_name (DBusConnection *connection)
567 _dbus_return_val_if_fail (connection != NULL, NULL);
569 bd = ensure_bus_data (connection);
573 return bd->unique_name;
577 * Asks the bus to return the uid of the named
580 * @param connection the connection
581 * @param name a name owned by the connection
582 * @param error location to store the error
583 * @returns a result code, -1 if error is set
586 dbus_bus_get_unix_user (DBusConnection *connection,
590 DBusMessage *message, *reply;
593 _dbus_return_val_if_fail (connection != NULL, DBUS_UID_UNSET);
594 _dbus_return_val_if_fail (name != NULL, DBUS_UID_UNSET);
595 _dbus_return_val_if_fail (_dbus_check_is_valid_bus_name (name), DBUS_UID_UNSET);
596 _dbus_return_val_if_error_is_set (error, DBUS_UID_UNSET);
598 message = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
601 "GetConnectionUnixUser");
605 _DBUS_SET_OOM (error);
606 return DBUS_UID_UNSET;
609 if (!dbus_message_append_args (message,
610 DBUS_TYPE_STRING, &name,
613 dbus_message_unref (message);
614 _DBUS_SET_OOM (error);
615 return DBUS_UID_UNSET;
618 reply = dbus_connection_send_with_reply_and_block (connection, message, -1,
621 dbus_message_unref (message);
625 _DBUS_ASSERT_ERROR_IS_SET (error);
626 return DBUS_UID_UNSET;
629 if (dbus_set_error_from_message (error, reply))
631 _DBUS_ASSERT_ERROR_IS_SET (error);
632 dbus_message_unref (reply);
633 return DBUS_UID_UNSET;
636 if (!dbus_message_get_args (reply, error,
637 DBUS_TYPE_UINT32, &uid,
640 _DBUS_ASSERT_ERROR_IS_SET (error);
641 dbus_message_unref (reply);
642 return DBUS_UID_UNSET;
645 dbus_message_unref (reply);
647 return (unsigned long) uid;
652 * Asks the bus to assign the given name to this connection by invoking
653 * the RequestName method on the bus. This method is fully documented
654 * in the D-BUS specification. For quick reference, the flags and
655 * result codes are discussed here, but the specification is the
656 * canonical version of this information.
658 * The #DBUS_NAME_FLAG_PROHIBIT_REPLACEMENT flag indicates that
659 * if the name is successfully requested, other applications
660 * will not be able to take over the name. i.e. the name's
661 * owner (the application calling this function) must let go of
662 * the name, it will not lose it involuntarily.
664 * The #DBUS_NAME_FLAG_REPLACE_EXISTING flag indicates that the caller
665 * would like to take over the name from the current owner.
666 * If the current name owner used #DBUS_NAME_FLAG_PROHIBIT_REPLACEMENT
667 * then this flag indicates that the caller would like to be placed
668 * in the queue to own the name when the current owner lets go.
670 * If no flags are given, an application will receive the requested
671 * name only if the name is currently unowned; and it will give
672 * up the name if another application asks to take it over using
673 * #DBUS_NAME_FLAG_REPLACE_EXISTING.
675 * This function returns a result code. The possible result codes
678 * #DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER means that the name had no
679 * existing owner, and the caller is now the primary owner; or that
680 * the name had an owner, and the caller specified
681 * #DBUS_NAME_FLAG_REPLACE_EXISTING, and the current owner did not
682 * specify #DBUS_NAME_FLAG_PROHIBIT_REPLACEMENT.
684 * #DBUS_REQUEST_NAME_REPLY_IN_QUEUE happens only if the current owner
685 * specified #DBUS_NAME_FLAG_PROHIBIT_REPLACEMENT and the caller specified
686 * #DBUS_NAME_FLAG_REPLACE_EXISTING. In this case the caller ends up in
687 * a queue to own the name after the current owner gives it up.
689 * #DBUS_REQUEST_NAME_REPLY_EXISTS happens if the name has an owner
690 * #already and DBUS_NAME_FLAG_REPLACE_EXISTING was not specified.
692 * #DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER happens if an application
693 * requests a name it already owns.
695 * When a service represents an application, say "text editor," then
696 * it should specify #DBUS_NAME_FLAG_PROHIBIT_REPLACEMENT if it wants
697 * the first editor started to be the user's editor vs. the last one
698 * started. Then any editor that can be the user's editor should
699 * specify #DBUS_NAME_FLAG_REPLACE_EXISTING to either take over
700 * (last-started-wins) or be queued up (first-started-wins) according
701 * to whether #DBUS_NAME_FLAG_PROHIBIT_REPLACEMENT was given.
703 * @todo this all seems sort of broken. Shouldn't the flags be a property
704 * of the name, not the app requesting the name? What are the use-cases
705 * other than the "text editor" thing and how are we supporting them?
707 * @param connection the connection
708 * @param name the name to request
710 * @param error location to store the error
711 * @returns a result code, -1 if error is set
714 dbus_bus_request_name (DBusConnection *connection,
719 DBusMessage *message, *reply;
720 dbus_uint32_t result;
722 _dbus_return_val_if_fail (connection != NULL, 0);
723 _dbus_return_val_if_fail (name != NULL, 0);
724 _dbus_return_val_if_fail (_dbus_check_is_valid_bus_name (name), 0);
725 _dbus_return_val_if_error_is_set (error, 0);
727 message = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
734 _DBUS_SET_OOM (error);
738 if (!dbus_message_append_args (message,
739 DBUS_TYPE_STRING, &name,
740 DBUS_TYPE_UINT32, &flags,
743 dbus_message_unref (message);
744 _DBUS_SET_OOM (error);
748 reply = dbus_connection_send_with_reply_and_block (connection, message, -1,
751 dbus_message_unref (message);
755 _DBUS_ASSERT_ERROR_IS_SET (error);
759 if (dbus_set_error_from_message (error, reply))
761 _DBUS_ASSERT_ERROR_IS_SET (error);
762 dbus_message_unref (reply);
766 if (!dbus_message_get_args (reply, error,
767 DBUS_TYPE_UINT32, &result,
770 _DBUS_ASSERT_ERROR_IS_SET (error);
771 dbus_message_unref (reply);
775 dbus_message_unref (reply);
781 dbus_bus_release_name (DBusConnection *connection,
785 DBusMessage *message, *reply;
786 dbus_uint32_t result;
788 _dbus_return_val_if_fail (connection != NULL, 0);
789 _dbus_return_val_if_fail (name != NULL, 0);
790 _dbus_return_val_if_fail (_dbus_check_is_valid_bus_name (name), 0);
791 _dbus_return_val_if_error_is_set (error, 0);
793 message = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
800 _DBUS_SET_OOM (error);
804 if (!dbus_message_append_args (message,
805 DBUS_TYPE_STRING, &name,
808 dbus_message_unref (message);
809 _DBUS_SET_OOM (error);
813 reply = dbus_connection_send_with_reply_and_block (connection, message, -1,
816 dbus_message_unref (message);
820 _DBUS_ASSERT_ERROR_IS_SET (error);
824 if (dbus_set_error_from_message (error, reply))
826 _DBUS_ASSERT_ERROR_IS_SET (error);
827 dbus_message_unref (reply);
831 if (!dbus_message_get_args (reply, error,
832 DBUS_TYPE_UINT32, &result,
835 _DBUS_ASSERT_ERROR_IS_SET (error);
836 dbus_message_unref (reply);
840 dbus_message_unref (reply);
846 * Checks whether a certain name has an owner.
848 * @param connection the connection
849 * @param name the name
850 * @param error location to store any errors
851 * @returns #TRUE if the name exists, #FALSE if not or on error
854 dbus_bus_name_has_owner (DBusConnection *connection,
858 DBusMessage *message, *reply;
861 _dbus_return_val_if_fail (connection != NULL, FALSE);
862 _dbus_return_val_if_fail (name != NULL, FALSE);
863 _dbus_return_val_if_fail (_dbus_check_is_valid_bus_name (name), FALSE);
864 _dbus_return_val_if_error_is_set (error, FALSE);
866 message = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
872 _DBUS_SET_OOM (error);
876 if (!dbus_message_append_args (message,
877 DBUS_TYPE_STRING, &name,
880 dbus_message_unref (message);
881 _DBUS_SET_OOM (error);
885 reply = dbus_connection_send_with_reply_and_block (connection, message, -1, error);
886 dbus_message_unref (message);
890 _DBUS_ASSERT_ERROR_IS_SET (error);
894 if (!dbus_message_get_args (reply, error,
895 DBUS_TYPE_BOOLEAN, &exists,
898 _DBUS_ASSERT_ERROR_IS_SET (error);
899 dbus_message_unref (reply);
903 dbus_message_unref (reply);
908 * Starts a service that will request ownership of the given name.
909 * The returned result will be one of be one of
910 * #DBUS_START_REPLY_SUCCESS or #DBUS_START_REPLY_ALREADY_RUNNING if
911 * successful. Pass #NULL if you don't care about the result.
913 * The flags parameter is for future expansion, currently you should
916 * @param connection the connection
917 * @param name the name we want the new service to request
918 * @param flags the flags (should always be 0 for now)
919 * @param result a place to store the result or #NULL
920 * @param error location to store any errors
921 * @returns #TRUE if the activation succeeded, #FALSE if not
924 dbus_bus_start_service_by_name (DBusConnection *connection,
927 dbus_uint32_t *result,
933 _dbus_return_val_if_fail (connection != NULL, FALSE);
934 _dbus_return_val_if_fail (_dbus_check_is_valid_bus_name (name), FALSE);
936 msg = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
939 "StartServiceByName");
941 if (!dbus_message_append_args (msg, DBUS_TYPE_STRING, &name,
942 DBUS_TYPE_UINT32, &flags, DBUS_TYPE_INVALID))
944 dbus_message_unref (msg);
945 _DBUS_SET_OOM (error);
949 reply = dbus_connection_send_with_reply_and_block (connection, msg,
951 dbus_message_unref (msg);
955 _DBUS_ASSERT_ERROR_IS_SET (error);
959 if (dbus_set_error_from_message (error, reply))
961 _DBUS_ASSERT_ERROR_IS_SET (error);
962 dbus_message_unref (reply);
966 if (result != NULL &&
967 !dbus_message_get_args (reply, error, DBUS_TYPE_UINT32,
968 result, DBUS_TYPE_INVALID))
970 _DBUS_ASSERT_ERROR_IS_SET (error);
971 dbus_message_unref (reply);
975 dbus_message_unref (reply);
980 send_no_return_values (DBusConnection *connection,
986 /* Block to check success codepath */
989 reply = dbus_connection_send_with_reply_and_block (connection, msg,
993 _DBUS_ASSERT_ERROR_IS_SET (error);
995 dbus_message_unref (reply);
999 /* Silently-fail nonblocking codepath */
1000 dbus_message_set_no_reply (msg, TRUE);
1001 dbus_connection_send (connection, msg, NULL);
1006 * Adds a match rule to match messages going through the message bus.
1007 * The "rule" argument is the string form of a match rule.
1009 * If you pass #NULL for the error, this function will not
1010 * block; the match thus won't be added until you flush the
1011 * connection, and if there's an error adding the match
1012 * (only possible error is lack of resources in the bus),
1013 * you won't find out about it.
1015 * If you pass non-#NULL for the error this function will
1016 * block until it gets a reply.
1018 * Normal API conventions would have the function return
1019 * a boolean value indicating whether the error was set,
1020 * but that would require blocking always to determine
1023 * @param connection connection to the message bus
1024 * @param rule textual form of match rule
1025 * @param error location to store any errors
1028 dbus_bus_add_match (DBusConnection *connection,
1034 _dbus_return_if_fail (rule != NULL);
1036 msg = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
1038 DBUS_INTERFACE_DBUS,
1043 _DBUS_SET_OOM (error);
1047 if (!dbus_message_append_args (msg, DBUS_TYPE_STRING, &rule,
1050 dbus_message_unref (msg);
1051 _DBUS_SET_OOM (error);
1055 send_no_return_values (connection, msg, error);
1057 dbus_message_unref (msg);
1061 * Removes a previously-added match rule "by value" (the most
1062 * recently-added identical rule gets removed). The "rule" argument
1063 * is the string form of a match rule.
1065 * If you pass #NULL for the error, this function will not
1066 * block; otherwise it will. See detailed explanation in
1067 * docs for dbus_bus_add_match().
1069 * @param connection connection to the message bus
1070 * @param rule textual form of match rule
1071 * @param error location to store any errors
1074 dbus_bus_remove_match (DBusConnection *connection,
1080 _dbus_return_if_fail (rule != NULL);
1082 msg = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
1084 DBUS_INTERFACE_DBUS,
1087 if (!dbus_message_append_args (msg, DBUS_TYPE_STRING, &rule,
1090 dbus_message_unref (msg);
1091 _DBUS_SET_OOM (error);
1095 send_no_return_values (connection, msg, error);
1097 dbus_message_unref (msg);