1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* dbus-connection.c DBusConnection object
4 * Copyright (C) 2002-2006 Red Hat Inc.
6 * Licensed under the Academic Free License version 2.1
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #include "dbus-shared.h"
26 #include "dbus-connection.h"
27 #include "dbus-list.h"
28 #include "dbus-timeout.h"
29 #include "dbus-transport.h"
30 #include "dbus-watch.h"
31 #include "dbus-connection-internal.h"
32 #include "dbus-pending-call-internal.h"
33 #include "dbus-list.h"
34 #include "dbus-hash.h"
35 #include "dbus-message-internal.h"
36 #include "dbus-message-private.h"
37 #include "dbus-threads.h"
38 #include "dbus-protocol.h"
39 #include "dbus-dataslot.h"
40 #include "dbus-string.h"
41 #include "dbus-signature.h"
42 #include "dbus-pending-call.h"
43 #include "dbus-object-tree.h"
44 #include "dbus-threads-internal.h"
46 #include "dbus-marshal-basic.h"
48 #ifdef DBUS_DISABLE_CHECKS
49 #define TOOK_LOCK_CHECK(connection)
50 #define RELEASING_LOCK_CHECK(connection)
51 #define HAVE_LOCK_CHECK(connection)
53 #define TOOK_LOCK_CHECK(connection) do { \
54 _dbus_assert (!(connection)->have_connection_lock); \
55 (connection)->have_connection_lock = TRUE; \
57 #define RELEASING_LOCK_CHECK(connection) do { \
58 _dbus_assert ((connection)->have_connection_lock); \
59 (connection)->have_connection_lock = FALSE; \
61 #define HAVE_LOCK_CHECK(connection) _dbus_assert ((connection)->have_connection_lock)
62 /* A "DO_NOT_HAVE_LOCK_CHECK" is impossible since we need the lock to check the flag */
67 #define CONNECTION_LOCK(connection) do { \
68 if (TRACE_LOCKS) { _dbus_verbose ("LOCK\n"); } \
69 _dbus_mutex_lock ((connection)->mutex); \
70 TOOK_LOCK_CHECK (connection); \
73 #define CONNECTION_UNLOCK(connection) _dbus_connection_unlock (connection)
75 #define SLOTS_LOCK(connection) do { \
76 _dbus_mutex_lock ((connection)->slot_mutex); \
79 #define SLOTS_UNLOCK(connection) do { \
80 _dbus_mutex_unlock ((connection)->slot_mutex); \
83 #define DISPATCH_STATUS_NAME(s) \
84 ((s) == DBUS_DISPATCH_COMPLETE ? "complete" : \
85 (s) == DBUS_DISPATCH_DATA_REMAINS ? "data remains" : \
86 (s) == DBUS_DISPATCH_NEED_MEMORY ? "need memory" : \
90 * @defgroup DBusConnection DBusConnection
92 * @brief Connection to another application
94 * A DBusConnection represents a connection to another
95 * application. Messages can be sent and received via this connection.
96 * The other application may be a message bus; for convenience, the
97 * function dbus_bus_get() is provided to automatically open a
98 * connection to the well-known message buses.
100 * In brief a DBusConnection is a message queue associated with some
101 * message transport mechanism such as a socket. The connection
102 * maintains a queue of incoming messages and a queue of outgoing
105 * Several functions use the following terms:
107 * <li><b>read</b> means to fill the incoming message queue by reading from the socket</li>
108 * <li><b>write</b> means to drain the outgoing queue by writing to the socket</li>
109 * <li><b>dispatch</b> means to drain the incoming queue by invoking application-provided message handlers</li>
112 * The function dbus_connection_read_write_dispatch() for example does all
113 * three of these things, offering a simple alternative to a main loop.
115 * In an application with a main loop, the read/write/dispatch
116 * operations are usually separate.
118 * The connection provides #DBusWatch and #DBusTimeout objects to
119 * the main loop. These are used to know when reading, writing, or
120 * dispatching should be performed.
122 * Incoming messages are processed
123 * by calling dbus_connection_dispatch(). dbus_connection_dispatch()
124 * runs any handlers registered for the topmost message in the message
125 * queue, then discards the message, then returns.
127 * dbus_connection_get_dispatch_status() indicates whether
128 * messages are currently in the queue that need dispatching.
129 * dbus_connection_set_dispatch_status_function() allows
130 * you to set a function to be used to monitor the dispatch status.
132 * If you're using GLib or Qt add-on libraries for D-Bus, there are
133 * special convenience APIs in those libraries that hide
134 * all the details of dispatch and watch/timeout monitoring.
135 * For example, dbus_connection_setup_with_g_main().
137 * If you aren't using these add-on libraries, but want to process
138 * messages asynchronously, you must manually call
139 * dbus_connection_set_dispatch_status_function(),
140 * dbus_connection_set_watch_functions(),
141 * dbus_connection_set_timeout_functions() providing appropriate
142 * functions to integrate the connection with your application's main
143 * loop. This can be tricky to get right; main loops are not simple.
145 * If you don't need to be asynchronous, you can ignore #DBusWatch,
146 * #DBusTimeout, and dbus_connection_dispatch(). Instead,
147 * dbus_connection_read_write_dispatch() can be used.
149 * Or, in <em>very</em> simple applications,
150 * dbus_connection_pop_message() may be all you need, allowing you to
151 * avoid setting up any handler functions (see
152 * dbus_connection_add_filter(),
153 * dbus_connection_register_object_path() for more on handlers).
155 * When you use dbus_connection_send() or one of its variants to send
156 * a message, the message is added to the outgoing queue. It's
157 * actually written to the network later; either in
158 * dbus_watch_handle() invoked by your main loop, or in
159 * dbus_connection_flush() which blocks until it can write out the
160 * entire outgoing queue. The GLib/Qt add-on libraries again
161 * handle the details here for you by setting up watch functions.
163 * When a connection is disconnected, you are guaranteed to get a
164 * signal "Disconnected" from the interface
165 * #DBUS_INTERFACE_LOCAL, path
168 * You may not drop the last reference to a #DBusConnection
169 * until that connection has been disconnected.
171 * You may dispatch the unprocessed incoming message queue even if the
172 * connection is disconnected. However, "Disconnected" will always be
173 * the last message in the queue (obviously no messages are received
174 * after disconnection).
176 * After calling dbus_threads_init(), #DBusConnection has thread
177 * locks and drops them when invoking user callbacks, so in general is
178 * transparently threadsafe. However, #DBusMessage does NOT have
179 * thread locks; you must not send the same message to multiple
180 * #DBusConnection if those connections will be used from different threads,
183 * Also, if you dispatch or pop messages from multiple threads, it
184 * may work in the sense that it won't crash, but it's tough to imagine
185 * sane results; it will be completely unpredictable which messages
186 * go to which threads.
188 * It's recommended to dispatch from a single thread.
190 * The most useful function to call from multiple threads at once
191 * is dbus_connection_send_with_reply_and_block(). That is,
192 * multiple threads can make method calls at the same time.
194 * If you aren't using threads, you can use a main loop and
195 * dbus_pending_call_set_notify() to achieve a similar result.
199 * @defgroup DBusConnectionInternals DBusConnection implementation details
200 * @ingroup DBusInternals
201 * @brief Implementation details of DBusConnection
207 * Internal struct representing a message filter function
209 typedef struct DBusMessageFilter DBusMessageFilter;
212 * Internal struct representing a message filter function
214 struct DBusMessageFilter
216 DBusAtomic refcount; /**< Reference count */
217 DBusHandleMessageFunction function; /**< Function to call to filter */
218 void *user_data; /**< User data for the function */
219 DBusFreeFunction free_user_data_function; /**< Function to free the user data */
224 * Internals of DBusPreallocatedSend
226 struct DBusPreallocatedSend
228 DBusConnection *connection; /**< Connection we'd send the message to */
229 DBusList *queue_link; /**< Preallocated link in the queue */
230 DBusList *counter_link; /**< Preallocated link in the resource counter */
233 #if HAVE_DECL_MSG_NOSIGNAL
234 static dbus_bool_t _dbus_modify_sigpipe = FALSE;
236 static dbus_bool_t _dbus_modify_sigpipe = TRUE;
240 * Implementation details of DBusConnection. All fields are private.
242 struct DBusConnection
244 DBusAtomic refcount; /**< Reference count. */
246 DBusMutex *mutex; /**< Lock on the entire DBusConnection */
248 DBusMutex *dispatch_mutex; /**< Protects dispatch_acquired */
249 DBusCondVar *dispatch_cond; /**< Notify when dispatch_acquired is available */
250 DBusMutex *io_path_mutex; /**< Protects io_path_acquired */
251 DBusCondVar *io_path_cond; /**< Notify when io_path_acquired is available */
253 DBusList *outgoing_messages; /**< Queue of messages we need to send, send the end of the list first. */
254 DBusList *incoming_messages; /**< Queue of messages we have received, end of the list received most recently. */
255 DBusList *expired_messages; /**< Messages that will be released when we next unlock. */
257 DBusMessage *message_borrowed; /**< Filled in if the first incoming message has been borrowed;
258 * dispatch_acquired will be set by the borrower
261 int n_outgoing; /**< Length of outgoing queue. */
262 int n_incoming; /**< Length of incoming queue. */
264 DBusCounter *outgoing_counter; /**< Counts size of outgoing messages. */
266 DBusTransport *transport; /**< Object that sends/receives messages over network. */
267 DBusWatchList *watches; /**< Stores active watches. */
268 DBusTimeoutList *timeouts; /**< Stores active timeouts. */
270 DBusList *filter_list; /**< List of filters. */
272 DBusMutex *slot_mutex; /**< Lock on slot_list so overall connection lock need not be taken */
273 DBusDataSlotList slot_list; /**< Data stored by allocated integer ID */
275 DBusHashTable *pending_replies; /**< Hash of message serials to #DBusPendingCall. */
277 dbus_uint32_t client_serial; /**< Client serial. Increments each time a message is sent */
278 DBusList *disconnect_message_link; /**< Preallocated list node for queueing the disconnection message */
280 DBusWakeupMainFunction wakeup_main_function; /**< Function to wake up the mainloop */
281 void *wakeup_main_data; /**< Application data for wakeup_main_function */
282 DBusFreeFunction free_wakeup_main_data; /**< free wakeup_main_data */
284 DBusDispatchStatusFunction dispatch_status_function; /**< Function on dispatch status changes */
285 void *dispatch_status_data; /**< Application data for dispatch_status_function */
286 DBusFreeFunction free_dispatch_status_data; /**< free dispatch_status_data */
288 DBusDispatchStatus last_dispatch_status; /**< The last dispatch status we reported to the application. */
290 DBusObjectTree *objects; /**< Object path handlers registered with this connection */
292 char *server_guid; /**< GUID of server if we are in shared_connections, #NULL if server GUID is unknown or connection is private */
294 /* These two MUST be bools and not bitfields, because they are protected by a separate lock
295 * from connection->mutex and all bitfields in a word have to be read/written together.
296 * So you can't have a different lock for different bitfields in the same word.
298 dbus_bool_t dispatch_acquired; /**< Someone has dispatch path (can drain incoming queue) */
299 dbus_bool_t io_path_acquired; /**< Someone has transport io path (can use the transport to read/write messages) */
301 unsigned int shareable : 1; /**< #TRUE if libdbus owns a reference to the connection and can return it from dbus_connection_open() more than once */
303 unsigned int exit_on_disconnect : 1; /**< If #TRUE, exit after handling disconnect signal */
305 unsigned int route_peer_messages : 1; /**< If #TRUE, if org.freedesktop.DBus.Peer messages have a bus name, don't handle them automatically */
307 unsigned int disconnected_message_arrived : 1; /**< We popped or are dispatching the disconnected message.
308 * if the disconnect_message_link is NULL then we queued it, but
309 * this flag is whether it got to the head of the queue.
311 unsigned int disconnected_message_processed : 1; /**< We did our default handling of the disconnected message,
312 * such as closing the connection.
315 #ifndef DBUS_DISABLE_CHECKS
316 unsigned int have_connection_lock : 1; /**< Used to check locking */
319 #ifndef DBUS_DISABLE_CHECKS
320 int generation; /**< _dbus_current_generation that should correspond to this connection */
324 static DBusDispatchStatus _dbus_connection_get_dispatch_status_unlocked (DBusConnection *connection);
325 static void _dbus_connection_update_dispatch_status_and_unlock (DBusConnection *connection,
326 DBusDispatchStatus new_status);
327 static void _dbus_connection_last_unref (DBusConnection *connection);
328 static void _dbus_connection_acquire_dispatch (DBusConnection *connection);
329 static void _dbus_connection_release_dispatch (DBusConnection *connection);
330 static DBusDispatchStatus _dbus_connection_flush_unlocked (DBusConnection *connection);
331 static void _dbus_connection_close_possibly_shared_and_unlock (DBusConnection *connection);
332 static dbus_bool_t _dbus_connection_get_is_connected_unlocked (DBusConnection *connection);
333 static dbus_bool_t _dbus_connection_peek_for_reply_unlocked (DBusConnection *connection,
334 dbus_uint32_t client_serial);
336 static DBusMessageFilter *
337 _dbus_message_filter_ref (DBusMessageFilter *filter)
339 #ifdef DBUS_DISABLE_ASSERT
340 _dbus_atomic_inc (&filter->refcount);
342 dbus_int32_t old_value;
344 old_value = _dbus_atomic_inc (&filter->refcount);
345 _dbus_assert (old_value > 0);
352 _dbus_message_filter_unref (DBusMessageFilter *filter)
354 dbus_int32_t old_value;
356 old_value = _dbus_atomic_dec (&filter->refcount);
357 _dbus_assert (old_value > 0);
361 if (filter->free_user_data_function)
362 (* filter->free_user_data_function) (filter->user_data);
369 * Acquires the connection lock.
371 * @param connection the connection.
374 _dbus_connection_lock (DBusConnection *connection)
376 CONNECTION_LOCK (connection);
380 * Releases the connection lock.
382 * @param connection the connection.
385 _dbus_connection_unlock (DBusConnection *connection)
387 DBusList *expired_messages;
392 _dbus_verbose ("UNLOCK\n");
395 /* If we had messages that expired (fell off the incoming or outgoing
396 * queues) while we were locked, actually release them now */
397 expired_messages = connection->expired_messages;
398 connection->expired_messages = NULL;
400 RELEASING_LOCK_CHECK (connection);
401 _dbus_mutex_unlock (connection->mutex);
403 for (iter = _dbus_list_pop_first_link (&expired_messages);
405 iter = _dbus_list_pop_first_link (&expired_messages))
407 DBusMessage *message = iter->data;
409 dbus_message_unref (message);
410 _dbus_list_free_link (iter);
415 * Wakes up the main loop if it is sleeping
416 * Needed if we're e.g. queueing outgoing messages
417 * on a thread while the mainloop sleeps.
419 * @param connection the connection.
422 _dbus_connection_wakeup_mainloop (DBusConnection *connection)
424 if (connection->wakeup_main_function)
425 (*connection->wakeup_main_function) (connection->wakeup_main_data);
428 #ifdef DBUS_BUILD_TESTS
430 * Gets the locks so we can examine them
432 * @param connection the connection.
433 * @param mutex_loc return for the location of the main mutex pointer
434 * @param dispatch_mutex_loc return location of the dispatch mutex pointer
435 * @param io_path_mutex_loc return location of the io_path mutex pointer
436 * @param dispatch_cond_loc return location of the dispatch conditional
438 * @param io_path_cond_loc return location of the io_path conditional
442 _dbus_connection_test_get_locks (DBusConnection *connection,
443 DBusMutex **mutex_loc,
444 DBusMutex **dispatch_mutex_loc,
445 DBusMutex **io_path_mutex_loc,
446 DBusCondVar **dispatch_cond_loc,
447 DBusCondVar **io_path_cond_loc)
449 *mutex_loc = connection->mutex;
450 *dispatch_mutex_loc = connection->dispatch_mutex;
451 *io_path_mutex_loc = connection->io_path_mutex;
452 *dispatch_cond_loc = connection->dispatch_cond;
453 *io_path_cond_loc = connection->io_path_cond;
458 * Adds a message-containing list link to the incoming message queue,
459 * taking ownership of the link and the message's current refcount.
460 * Cannot fail due to lack of memory.
462 * @param connection the connection.
463 * @param link the message link to queue.
466 _dbus_connection_queue_received_message_link (DBusConnection *connection,
469 DBusPendingCall *pending;
470 dbus_uint32_t reply_serial;
471 DBusMessage *message;
473 _dbus_assert (_dbus_transport_get_is_authenticated (connection->transport));
475 _dbus_list_append_link (&connection->incoming_messages,
477 message = link->data;
479 /* If this is a reply we're waiting on, remove timeout for it */
480 reply_serial = dbus_message_get_reply_serial (message);
481 if (reply_serial != 0)
483 pending = _dbus_hash_table_lookup_int (connection->pending_replies,
487 if (_dbus_pending_call_is_timeout_added_unlocked (pending))
488 _dbus_connection_remove_timeout_unlocked (connection,
489 _dbus_pending_call_get_timeout_unlocked (pending));
491 _dbus_pending_call_set_timeout_added_unlocked (pending, FALSE);
497 connection->n_incoming += 1;
499 _dbus_connection_wakeup_mainloop (connection);
501 _dbus_verbose ("Message %p (%s %s %s %s '%s' reply to %u) added to incoming queue %p, %d incoming\n",
503 dbus_message_type_to_string (dbus_message_get_type (message)),
504 dbus_message_get_path (message) ?
505 dbus_message_get_path (message) :
507 dbus_message_get_interface (message) ?
508 dbus_message_get_interface (message) :
510 dbus_message_get_member (message) ?
511 dbus_message_get_member (message) :
513 dbus_message_get_signature (message),
514 dbus_message_get_reply_serial (message),
516 connection->n_incoming);
518 _dbus_message_trace_ref (message, -1, -1,
519 "_dbus_conection_queue_received_message_link");
523 * Adds a link + message to the incoming message queue.
524 * Can't fail. Takes ownership of both link and message.
526 * @param connection the connection.
527 * @param link the list node and message to queue.
531 _dbus_connection_queue_synthesized_message_link (DBusConnection *connection,
534 HAVE_LOCK_CHECK (connection);
536 _dbus_list_append_link (&connection->incoming_messages, link);
538 connection->n_incoming += 1;
540 _dbus_connection_wakeup_mainloop (connection);
542 _dbus_message_trace_ref (link->data, -1, -1,
543 "_dbus_connection_queue_synthesized_message_link");
545 _dbus_verbose ("Synthesized message %p added to incoming queue %p, %d incoming\n",
546 link->data, connection, connection->n_incoming);
551 * Checks whether there are messages in the outgoing message queue.
552 * Called with connection lock held.
554 * @param connection the connection.
555 * @returns #TRUE if the outgoing queue is non-empty.
558 _dbus_connection_has_messages_to_send_unlocked (DBusConnection *connection)
560 HAVE_LOCK_CHECK (connection);
561 return connection->outgoing_messages != NULL;
565 * Checks whether there are messages in the outgoing message queue.
566 * Use dbus_connection_flush() to block until all outgoing
567 * messages have been written to the underlying transport
568 * (such as a socket).
570 * @param connection the connection.
571 * @returns #TRUE if the outgoing queue is non-empty.
574 dbus_connection_has_messages_to_send (DBusConnection *connection)
578 _dbus_return_val_if_fail (connection != NULL, FALSE);
580 CONNECTION_LOCK (connection);
581 v = _dbus_connection_has_messages_to_send_unlocked (connection);
582 CONNECTION_UNLOCK (connection);
588 * Gets the next outgoing message. The message remains in the
589 * queue, and the caller does not own a reference to it.
591 * @param connection the connection.
592 * @returns the message to be sent.
595 _dbus_connection_get_message_to_send (DBusConnection *connection)
597 HAVE_LOCK_CHECK (connection);
599 return _dbus_list_get_last (&connection->outgoing_messages);
603 * Notifies the connection that a message has been sent, so the
604 * message can be removed from the outgoing queue.
605 * Called with the connection lock held.
607 * @param connection the connection.
608 * @param message the message that was sent.
611 _dbus_connection_message_sent_unlocked (DBusConnection *connection,
612 DBusMessage *message)
616 HAVE_LOCK_CHECK (connection);
618 /* This can be called before we even complete authentication, since
619 * it's called on disconnect to clean up the outgoing queue.
620 * It's also called as we successfully send each message.
623 link = _dbus_list_get_last_link (&connection->outgoing_messages);
624 _dbus_assert (link != NULL);
625 _dbus_assert (link->data == message);
627 _dbus_list_unlink (&connection->outgoing_messages,
629 _dbus_list_prepend_link (&connection->expired_messages, link);
631 connection->n_outgoing -= 1;
633 _dbus_verbose ("Message %p (%s %s %s %s '%s') removed from outgoing queue %p, %d left to send\n",
635 dbus_message_type_to_string (dbus_message_get_type (message)),
636 dbus_message_get_path (message) ?
637 dbus_message_get_path (message) :
639 dbus_message_get_interface (message) ?
640 dbus_message_get_interface (message) :
642 dbus_message_get_member (message) ?
643 dbus_message_get_member (message) :
645 dbus_message_get_signature (message),
646 connection, connection->n_outgoing);
648 /* It's OK that in principle we call the notify function, because for the
649 * outgoing limit, there isn't one */
650 _dbus_message_remove_counter (message, connection->outgoing_counter);
652 /* The message will actually be unreffed when we unlock */
655 /** Function to be called in protected_change_watch() with refcount held */
656 typedef dbus_bool_t (* DBusWatchAddFunction) (DBusWatchList *list,
658 /** Function to be called in protected_change_watch() with refcount held */
659 typedef void (* DBusWatchRemoveFunction) (DBusWatchList *list,
661 /** Function to be called in protected_change_watch() with refcount held */
662 typedef void (* DBusWatchToggleFunction) (DBusWatchList *list,
664 dbus_bool_t enabled);
667 protected_change_watch (DBusConnection *connection,
669 DBusWatchAddFunction add_function,
670 DBusWatchRemoveFunction remove_function,
671 DBusWatchToggleFunction toggle_function,
676 HAVE_LOCK_CHECK (connection);
678 /* The original purpose of protected_change_watch() was to hold a
679 * ref on the connection while dropping the connection lock, then
680 * calling out to the app. This was a broken hack that did not
681 * work, since the connection was in a hosed state (no WatchList
682 * field) while calling out.
684 * So for now we'll just keep the lock while calling out. This means
685 * apps are not allowed to call DBusConnection methods inside a
686 * watch function or they will deadlock.
688 * The "real fix" is to use the _and_unlock() pattern found
689 * elsewhere in the code, to defer calling out to the app until
690 * we're about to drop locks and return flow of control to the app
693 * See http://lists.freedesktop.org/archives/dbus/2007-July/thread.html#8144
696 if (connection->watches)
699 retval = (* add_function) (connection->watches, watch);
700 else if (remove_function)
703 (* remove_function) (connection->watches, watch);
708 (* toggle_function) (connection->watches, watch, enabled);
718 * Adds a watch using the connection's DBusAddWatchFunction if
719 * available. Otherwise records the watch to be added when said
720 * function is available. Also re-adds the watch if the
721 * DBusAddWatchFunction changes. May fail due to lack of memory.
722 * Connection lock should be held when calling this.
724 * @param connection the connection.
725 * @param watch the watch to add.
726 * @returns #TRUE on success.
729 _dbus_connection_add_watch_unlocked (DBusConnection *connection,
732 return protected_change_watch (connection, watch,
733 _dbus_watch_list_add_watch,
738 * Removes a watch using the connection's DBusRemoveWatchFunction
739 * if available. It's an error to call this function on a watch
740 * that was not previously added.
741 * Connection lock should be held when calling this.
743 * @param connection the connection.
744 * @param watch the watch to remove.
747 _dbus_connection_remove_watch_unlocked (DBusConnection *connection,
750 protected_change_watch (connection, watch,
752 _dbus_watch_list_remove_watch,
757 * Toggles a watch and notifies app via connection's
758 * DBusWatchToggledFunction if available. It's an error to call this
759 * function on a watch that was not previously added.
760 * Connection lock should be held when calling this.
762 * @param connection the connection.
763 * @param watch the watch to toggle.
764 * @param enabled whether to enable or disable
767 _dbus_connection_toggle_watch_unlocked (DBusConnection *connection,
771 _dbus_assert (watch != NULL);
773 protected_change_watch (connection, watch,
775 _dbus_watch_list_toggle_watch,
779 /** Function to be called in protected_change_timeout() with refcount held */
780 typedef dbus_bool_t (* DBusTimeoutAddFunction) (DBusTimeoutList *list,
781 DBusTimeout *timeout);
782 /** Function to be called in protected_change_timeout() with refcount held */
783 typedef void (* DBusTimeoutRemoveFunction) (DBusTimeoutList *list,
784 DBusTimeout *timeout);
785 /** Function to be called in protected_change_timeout() with refcount held */
786 typedef void (* DBusTimeoutToggleFunction) (DBusTimeoutList *list,
787 DBusTimeout *timeout,
788 dbus_bool_t enabled);
791 protected_change_timeout (DBusConnection *connection,
792 DBusTimeout *timeout,
793 DBusTimeoutAddFunction add_function,
794 DBusTimeoutRemoveFunction remove_function,
795 DBusTimeoutToggleFunction toggle_function,
800 HAVE_LOCK_CHECK (connection);
802 /* The original purpose of protected_change_timeout() was to hold a
803 * ref on the connection while dropping the connection lock, then
804 * calling out to the app. This was a broken hack that did not
805 * work, since the connection was in a hosed state (no TimeoutList
806 * field) while calling out.
808 * So for now we'll just keep the lock while calling out. This means
809 * apps are not allowed to call DBusConnection methods inside a
810 * timeout function or they will deadlock.
812 * The "real fix" is to use the _and_unlock() pattern found
813 * elsewhere in the code, to defer calling out to the app until
814 * we're about to drop locks and return flow of control to the app
817 * See http://lists.freedesktop.org/archives/dbus/2007-July/thread.html#8144
820 if (connection->timeouts)
823 retval = (* add_function) (connection->timeouts, timeout);
824 else if (remove_function)
827 (* remove_function) (connection->timeouts, timeout);
832 (* toggle_function) (connection->timeouts, timeout, enabled);
841 * Adds a timeout using the connection's DBusAddTimeoutFunction if
842 * available. Otherwise records the timeout to be added when said
843 * function is available. Also re-adds the timeout if the
844 * DBusAddTimeoutFunction changes. May fail due to lack of memory.
845 * The timeout will fire repeatedly until removed.
846 * Connection lock should be held when calling this.
848 * @param connection the connection.
849 * @param timeout the timeout to add.
850 * @returns #TRUE on success.
853 _dbus_connection_add_timeout_unlocked (DBusConnection *connection,
854 DBusTimeout *timeout)
856 return protected_change_timeout (connection, timeout,
857 _dbus_timeout_list_add_timeout,
862 * Removes a timeout using the connection's DBusRemoveTimeoutFunction
863 * if available. It's an error to call this function on a timeout
864 * that was not previously added.
865 * Connection lock should be held when calling this.
867 * @param connection the connection.
868 * @param timeout the timeout to remove.
871 _dbus_connection_remove_timeout_unlocked (DBusConnection *connection,
872 DBusTimeout *timeout)
874 protected_change_timeout (connection, timeout,
876 _dbus_timeout_list_remove_timeout,
881 * Toggles a timeout and notifies app via connection's
882 * DBusTimeoutToggledFunction if available. It's an error to call this
883 * function on a timeout that was not previously added.
884 * Connection lock should be held when calling this.
886 * @param connection the connection.
887 * @param timeout the timeout to toggle.
888 * @param enabled whether to enable or disable
891 _dbus_connection_toggle_timeout_unlocked (DBusConnection *connection,
892 DBusTimeout *timeout,
895 protected_change_timeout (connection, timeout,
897 _dbus_timeout_list_toggle_timeout,
902 _dbus_connection_attach_pending_call_unlocked (DBusConnection *connection,
903 DBusPendingCall *pending)
905 dbus_uint32_t reply_serial;
906 DBusTimeout *timeout;
908 HAVE_LOCK_CHECK (connection);
910 reply_serial = _dbus_pending_call_get_reply_serial_unlocked (pending);
912 _dbus_assert (reply_serial != 0);
914 timeout = _dbus_pending_call_get_timeout_unlocked (pending);
918 if (!_dbus_connection_add_timeout_unlocked (connection, timeout))
921 if (!_dbus_hash_table_insert_int (connection->pending_replies,
925 _dbus_connection_remove_timeout_unlocked (connection, timeout);
927 _dbus_pending_call_set_timeout_added_unlocked (pending, FALSE);
928 HAVE_LOCK_CHECK (connection);
932 _dbus_pending_call_set_timeout_added_unlocked (pending, TRUE);
936 if (!_dbus_hash_table_insert_int (connection->pending_replies,
940 HAVE_LOCK_CHECK (connection);
945 _dbus_pending_call_ref_unlocked (pending);
947 HAVE_LOCK_CHECK (connection);
953 free_pending_call_on_hash_removal (void *data)
955 DBusPendingCall *pending;
956 DBusConnection *connection;
963 connection = _dbus_pending_call_get_connection_unlocked (pending);
965 HAVE_LOCK_CHECK (connection);
967 if (_dbus_pending_call_is_timeout_added_unlocked (pending))
969 _dbus_connection_remove_timeout_unlocked (connection,
970 _dbus_pending_call_get_timeout_unlocked (pending));
972 _dbus_pending_call_set_timeout_added_unlocked (pending, FALSE);
975 /* FIXME 1.0? this is sort of dangerous and undesirable to drop the lock
976 * here, but the pending call finalizer could in principle call out to
977 * application code so we pretty much have to... some larger code reorg
980 _dbus_connection_ref_unlocked (connection);
981 _dbus_pending_call_unref_and_unlock (pending);
982 CONNECTION_LOCK (connection);
983 _dbus_connection_unref_unlocked (connection);
987 _dbus_connection_detach_pending_call_unlocked (DBusConnection *connection,
988 DBusPendingCall *pending)
990 /* This ends up unlocking to call the pending call finalizer, which is unexpected to
993 _dbus_hash_table_remove_int (connection->pending_replies,
994 _dbus_pending_call_get_reply_serial_unlocked (pending));
998 _dbus_connection_detach_pending_call_and_unlock (DBusConnection *connection,
999 DBusPendingCall *pending)
1001 /* The idea here is to avoid finalizing the pending call
1002 * with the lock held, since there's a destroy notifier
1003 * in pending call that goes out to application code.
1005 * There's an extra unlock inside the hash table
1006 * "free pending call" function FIXME...
1008 _dbus_pending_call_ref_unlocked (pending);
1009 _dbus_hash_table_remove_int (connection->pending_replies,
1010 _dbus_pending_call_get_reply_serial_unlocked (pending));
1012 if (_dbus_pending_call_is_timeout_added_unlocked (pending))
1013 _dbus_connection_remove_timeout_unlocked (connection,
1014 _dbus_pending_call_get_timeout_unlocked (pending));
1016 _dbus_pending_call_set_timeout_added_unlocked (pending, FALSE);
1018 _dbus_pending_call_unref_and_unlock (pending);
1022 * Removes a pending call from the connection, such that
1023 * the pending reply will be ignored. May drop the last
1024 * reference to the pending call.
1026 * @param connection the connection
1027 * @param pending the pending call
1030 _dbus_connection_remove_pending_call (DBusConnection *connection,
1031 DBusPendingCall *pending)
1033 CONNECTION_LOCK (connection);
1034 _dbus_connection_detach_pending_call_and_unlock (connection, pending);
1038 * Acquire the transporter I/O path. This must be done before
1039 * doing any I/O in the transporter. May sleep and drop the
1040 * IO path mutex while waiting for the I/O path.
1042 * @param connection the connection.
1043 * @param timeout_milliseconds maximum blocking time, or -1 for no limit.
1044 * @returns TRUE if the I/O path was acquired.
1047 _dbus_connection_acquire_io_path (DBusConnection *connection,
1048 int timeout_milliseconds)
1050 dbus_bool_t we_acquired;
1052 HAVE_LOCK_CHECK (connection);
1054 /* We don't want the connection to vanish */
1055 _dbus_connection_ref_unlocked (connection);
1057 /* We will only touch io_path_acquired which is protected by our mutex */
1058 CONNECTION_UNLOCK (connection);
1060 _dbus_verbose ("locking io_path_mutex\n");
1061 _dbus_mutex_lock (connection->io_path_mutex);
1063 _dbus_verbose ("start connection->io_path_acquired = %d timeout = %d\n",
1064 connection->io_path_acquired, timeout_milliseconds);
1066 we_acquired = FALSE;
1068 if (connection->io_path_acquired)
1070 if (timeout_milliseconds != -1)
1072 _dbus_verbose ("waiting %d for IO path to be acquirable\n",
1073 timeout_milliseconds);
1075 if (!_dbus_condvar_wait_timeout (connection->io_path_cond,
1076 connection->io_path_mutex,
1077 timeout_milliseconds))
1079 /* We timed out before anyone signaled. */
1080 /* (writing the loop to handle the !timedout case by
1081 * waiting longer if needed is a pain since dbus
1082 * wraps pthread_cond_timedwait to take a relative
1083 * time instead of absolute, something kind of stupid
1084 * on our part. for now it doesn't matter, we will just
1085 * end up back here eventually.)
1091 while (connection->io_path_acquired)
1093 _dbus_verbose ("waiting for IO path to be acquirable\n");
1094 _dbus_condvar_wait (connection->io_path_cond,
1095 connection->io_path_mutex);
1100 if (!connection->io_path_acquired)
1103 connection->io_path_acquired = TRUE;
1106 _dbus_verbose ("end connection->io_path_acquired = %d we_acquired = %d\n",
1107 connection->io_path_acquired, we_acquired);
1109 _dbus_verbose ("unlocking io_path_mutex\n");
1110 _dbus_mutex_unlock (connection->io_path_mutex);
1112 CONNECTION_LOCK (connection);
1114 HAVE_LOCK_CHECK (connection);
1116 _dbus_connection_unref_unlocked (connection);
1122 * Release the I/O path when you're done with it. Only call
1123 * after you've acquired the I/O. Wakes up at most one thread
1124 * currently waiting to acquire the I/O path.
1126 * @param connection the connection.
1129 _dbus_connection_release_io_path (DBusConnection *connection)
1131 HAVE_LOCK_CHECK (connection);
1133 _dbus_verbose ("locking io_path_mutex\n");
1134 _dbus_mutex_lock (connection->io_path_mutex);
1136 _dbus_assert (connection->io_path_acquired);
1138 _dbus_verbose ("start connection->io_path_acquired = %d\n",
1139 connection->io_path_acquired);
1141 connection->io_path_acquired = FALSE;
1142 _dbus_condvar_wake_one (connection->io_path_cond);
1144 _dbus_verbose ("unlocking io_path_mutex\n");
1145 _dbus_mutex_unlock (connection->io_path_mutex);
1149 * Queues incoming messages and sends outgoing messages for this
1150 * connection, optionally blocking in the process. Each call to
1151 * _dbus_connection_do_iteration_unlocked() will call select() or poll() one
1152 * time and then read or write data if possible.
1154 * The purpose of this function is to be able to flush outgoing
1155 * messages or queue up incoming messages without returning
1156 * control to the application and causing reentrancy weirdness.
1158 * The flags parameter allows you to specify whether to
1159 * read incoming messages, write outgoing messages, or both,
1160 * and whether to block if no immediate action is possible.
1162 * The timeout_milliseconds parameter does nothing unless the
1163 * iteration is blocking.
1165 * If there are no outgoing messages and DBUS_ITERATION_DO_READING
1166 * wasn't specified, then it's impossible to block, even if
1167 * you specify DBUS_ITERATION_BLOCK; in that case the function
1168 * returns immediately.
1170 * If pending is not NULL then a check is made if the pending call
1171 * is completed after the io path has been required. If the call
1172 * has been completed nothing is done. This must be done since
1173 * the _dbus_connection_acquire_io_path releases the connection
1176 * Called with connection lock held.
1178 * @param connection the connection.
1179 * @param pending the pending call that should be checked or NULL
1180 * @param flags iteration flags.
1181 * @param timeout_milliseconds maximum blocking time, or -1 for no limit.
1184 _dbus_connection_do_iteration_unlocked (DBusConnection *connection,
1185 DBusPendingCall *pending,
1187 int timeout_milliseconds)
1189 _dbus_verbose ("start\n");
1191 HAVE_LOCK_CHECK (connection);
1193 if (connection->n_outgoing == 0)
1194 flags &= ~DBUS_ITERATION_DO_WRITING;
1196 if (_dbus_connection_acquire_io_path (connection,
1197 (flags & DBUS_ITERATION_BLOCK) ? timeout_milliseconds : 0))
1199 HAVE_LOCK_CHECK (connection);
1201 if ( (pending != NULL) && _dbus_pending_call_get_completed_unlocked(pending))
1203 _dbus_verbose ("pending call completed while acquiring I/O path");
1205 else if ( (pending != NULL) &&
1206 _dbus_connection_peek_for_reply_unlocked (connection,
1207 _dbus_pending_call_get_reply_serial_unlocked (pending)))
1209 _dbus_verbose ("pending call completed while acquiring I/O path (reply found in queue)");
1213 _dbus_transport_do_iteration (connection->transport,
1214 flags, timeout_milliseconds);
1217 _dbus_connection_release_io_path (connection);
1220 HAVE_LOCK_CHECK (connection);
1222 _dbus_verbose ("end\n");
1226 * Creates a new connection for the given transport. A transport
1227 * represents a message stream that uses some concrete mechanism, such
1228 * as UNIX domain sockets. May return #NULL if insufficient
1229 * memory exists to create the connection.
1231 * @param transport the transport.
1232 * @returns the new connection, or #NULL on failure.
1235 _dbus_connection_new_for_transport (DBusTransport *transport)
1237 DBusConnection *connection;
1238 DBusWatchList *watch_list;
1239 DBusTimeoutList *timeout_list;
1240 DBusHashTable *pending_replies;
1241 DBusList *disconnect_link;
1242 DBusMessage *disconnect_message;
1243 DBusCounter *outgoing_counter;
1244 DBusObjectTree *objects;
1248 pending_replies = NULL;
1249 timeout_list = NULL;
1250 disconnect_link = NULL;
1251 disconnect_message = NULL;
1252 outgoing_counter = NULL;
1255 watch_list = _dbus_watch_list_new ();
1256 if (watch_list == NULL)
1259 timeout_list = _dbus_timeout_list_new ();
1260 if (timeout_list == NULL)
1264 _dbus_hash_table_new (DBUS_HASH_INT,
1266 (DBusFreeFunction)free_pending_call_on_hash_removal);
1267 if (pending_replies == NULL)
1270 connection = dbus_new0 (DBusConnection, 1);
1271 if (connection == NULL)
1274 _dbus_mutex_new_at_location (&connection->mutex);
1275 if (connection->mutex == NULL)
1278 _dbus_mutex_new_at_location (&connection->io_path_mutex);
1279 if (connection->io_path_mutex == NULL)
1282 _dbus_mutex_new_at_location (&connection->dispatch_mutex);
1283 if (connection->dispatch_mutex == NULL)
1286 _dbus_condvar_new_at_location (&connection->dispatch_cond);
1287 if (connection->dispatch_cond == NULL)
1290 _dbus_condvar_new_at_location (&connection->io_path_cond);
1291 if (connection->io_path_cond == NULL)
1294 _dbus_mutex_new_at_location (&connection->slot_mutex);
1295 if (connection->slot_mutex == NULL)
1298 disconnect_message = dbus_message_new_signal (DBUS_PATH_LOCAL,
1299 DBUS_INTERFACE_LOCAL,
1302 if (disconnect_message == NULL)
1305 disconnect_link = _dbus_list_alloc_link (disconnect_message);
1306 if (disconnect_link == NULL)
1309 outgoing_counter = _dbus_counter_new ();
1310 if (outgoing_counter == NULL)
1313 objects = _dbus_object_tree_new (connection);
1314 if (objects == NULL)
1317 if (_dbus_modify_sigpipe)
1318 _dbus_disable_sigpipe ();
1320 /* initialized to 0: use atomic op to avoid mixing atomic and non-atomic */
1321 _dbus_atomic_inc (&connection->refcount);
1322 connection->transport = transport;
1323 connection->watches = watch_list;
1324 connection->timeouts = timeout_list;
1325 connection->pending_replies = pending_replies;
1326 connection->outgoing_counter = outgoing_counter;
1327 connection->filter_list = NULL;
1328 connection->last_dispatch_status = DBUS_DISPATCH_COMPLETE; /* so we're notified first time there's data */
1329 connection->objects = objects;
1330 connection->exit_on_disconnect = FALSE;
1331 connection->shareable = FALSE;
1332 connection->route_peer_messages = FALSE;
1333 connection->disconnected_message_arrived = FALSE;
1334 connection->disconnected_message_processed = FALSE;
1336 #ifndef DBUS_DISABLE_CHECKS
1337 connection->generation = _dbus_current_generation;
1340 _dbus_data_slot_list_init (&connection->slot_list);
1342 connection->client_serial = 1;
1344 connection->disconnect_message_link = disconnect_link;
1346 CONNECTION_LOCK (connection);
1348 if (!_dbus_transport_set_connection (transport, connection))
1350 CONNECTION_UNLOCK (connection);
1355 _dbus_transport_ref (transport);
1357 CONNECTION_UNLOCK (connection);
1362 if (disconnect_message != NULL)
1363 dbus_message_unref (disconnect_message);
1365 if (disconnect_link != NULL)
1366 _dbus_list_free_link (disconnect_link);
1368 if (connection != NULL)
1370 _dbus_condvar_free_at_location (&connection->io_path_cond);
1371 _dbus_condvar_free_at_location (&connection->dispatch_cond);
1372 _dbus_mutex_free_at_location (&connection->mutex);
1373 _dbus_mutex_free_at_location (&connection->io_path_mutex);
1374 _dbus_mutex_free_at_location (&connection->dispatch_mutex);
1375 _dbus_mutex_free_at_location (&connection->slot_mutex);
1376 dbus_free (connection);
1378 if (pending_replies)
1379 _dbus_hash_table_unref (pending_replies);
1382 _dbus_watch_list_free (watch_list);
1385 _dbus_timeout_list_free (timeout_list);
1387 if (outgoing_counter)
1388 _dbus_counter_unref (outgoing_counter);
1391 _dbus_object_tree_unref (objects);
1397 * Increments the reference count of a DBusConnection.
1398 * Requires that the caller already holds the connection lock.
1400 * @param connection the connection.
1401 * @returns the connection.
1404 _dbus_connection_ref_unlocked (DBusConnection *connection)
1406 _dbus_assert (connection != NULL);
1407 _dbus_assert (connection->generation == _dbus_current_generation);
1409 HAVE_LOCK_CHECK (connection);
1411 _dbus_atomic_inc (&connection->refcount);
1417 * Decrements the reference count of a DBusConnection.
1418 * Requires that the caller already holds the connection lock.
1420 * @param connection the connection.
1423 _dbus_connection_unref_unlocked (DBusConnection *connection)
1425 dbus_bool_t last_unref;
1427 HAVE_LOCK_CHECK (connection);
1429 _dbus_assert (connection != NULL);
1431 last_unref = (_dbus_atomic_dec (&connection->refcount) == 1);
1434 _dbus_connection_last_unref (connection);
1437 static dbus_uint32_t
1438 _dbus_connection_get_next_client_serial (DBusConnection *connection)
1440 dbus_uint32_t serial;
1442 serial = connection->client_serial++;
1444 if (connection->client_serial == 0)
1445 connection->client_serial = 1;
1451 * A callback for use with dbus_watch_new() to create a DBusWatch.
1453 * @todo This is basically a hack - we could delete _dbus_transport_handle_watch()
1454 * and the virtual handle_watch in DBusTransport if we got rid of it.
1455 * The reason this is some work is threading, see the _dbus_connection_handle_watch()
1458 * @param watch the watch.
1459 * @param condition the current condition of the file descriptors being watched.
1460 * @param data must be a pointer to a #DBusConnection
1461 * @returns #FALSE if the IO condition may not have been fully handled due to lack of memory
1464 _dbus_connection_handle_watch (DBusWatch *watch,
1465 unsigned int condition,
1468 DBusConnection *connection;
1470 DBusDispatchStatus status;
1474 _dbus_verbose ("start\n");
1476 CONNECTION_LOCK (connection);
1478 if (!_dbus_connection_acquire_io_path (connection, 1))
1480 /* another thread is handling the message */
1481 CONNECTION_UNLOCK (connection);
1485 HAVE_LOCK_CHECK (connection);
1486 retval = _dbus_transport_handle_watch (connection->transport,
1489 _dbus_connection_release_io_path (connection);
1491 HAVE_LOCK_CHECK (connection);
1493 _dbus_verbose ("middle\n");
1495 status = _dbus_connection_get_dispatch_status_unlocked (connection);
1497 /* this calls out to user code */
1498 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
1500 _dbus_verbose ("end\n");
1505 _DBUS_DEFINE_GLOBAL_LOCK (shared_connections);
1506 static DBusHashTable *shared_connections = NULL;
1507 static DBusList *shared_connections_no_guid = NULL;
1510 close_connection_on_shutdown (DBusConnection *connection)
1512 DBusMessage *message;
1514 dbus_connection_ref (connection);
1515 _dbus_connection_close_possibly_shared (connection);
1517 /* Churn through to the Disconnected message */
1518 while ((message = dbus_connection_pop_message (connection)))
1520 dbus_message_unref (message);
1522 dbus_connection_unref (connection);
1526 shared_connections_shutdown (void *data)
1530 _DBUS_LOCK (shared_connections);
1532 /* This is a little bit unpleasant... better ideas? */
1533 while ((n_entries = _dbus_hash_table_get_n_entries (shared_connections)) > 0)
1535 DBusConnection *connection;
1538 _dbus_hash_iter_init (shared_connections, &iter);
1539 _dbus_hash_iter_next (&iter);
1541 connection = _dbus_hash_iter_get_value (&iter);
1543 _DBUS_UNLOCK (shared_connections);
1544 close_connection_on_shutdown (connection);
1545 _DBUS_LOCK (shared_connections);
1547 /* The connection should now be dead and not in our hash ... */
1548 _dbus_assert (_dbus_hash_table_get_n_entries (shared_connections) < n_entries);
1551 _dbus_assert (_dbus_hash_table_get_n_entries (shared_connections) == 0);
1553 _dbus_hash_table_unref (shared_connections);
1554 shared_connections = NULL;
1556 if (shared_connections_no_guid != NULL)
1558 DBusConnection *connection;
1559 connection = _dbus_list_pop_first (&shared_connections_no_guid);
1560 while (connection != NULL)
1562 _DBUS_UNLOCK (shared_connections);
1563 close_connection_on_shutdown (connection);
1564 _DBUS_LOCK (shared_connections);
1565 connection = _dbus_list_pop_first (&shared_connections_no_guid);
1569 shared_connections_no_guid = NULL;
1571 _DBUS_UNLOCK (shared_connections);
1575 connection_lookup_shared (DBusAddressEntry *entry,
1576 DBusConnection **result)
1578 _dbus_verbose ("checking for existing connection\n");
1582 _DBUS_LOCK (shared_connections);
1584 if (shared_connections == NULL)
1586 _dbus_verbose ("creating shared_connections hash table\n");
1588 shared_connections = _dbus_hash_table_new (DBUS_HASH_STRING,
1591 if (shared_connections == NULL)
1593 _DBUS_UNLOCK (shared_connections);
1597 if (!_dbus_register_shutdown_func (shared_connections_shutdown, NULL))
1599 _dbus_hash_table_unref (shared_connections);
1600 shared_connections = NULL;
1601 _DBUS_UNLOCK (shared_connections);
1605 _dbus_verbose (" successfully created shared_connections\n");
1607 _DBUS_UNLOCK (shared_connections);
1608 return TRUE; /* no point looking up in the hash we just made */
1614 guid = dbus_address_entry_get_value (entry, "guid");
1618 DBusConnection *connection;
1620 connection = _dbus_hash_table_lookup_string (shared_connections,
1625 /* The DBusConnection can't be finalized without taking
1626 * the shared_connections lock to remove it from the
1627 * hash. So it's safe to ref the connection here.
1628 * However, it may be disconnected if the Disconnected
1629 * message hasn't been processed yet, in which case we
1630 * want to pretend it isn't in the hash and avoid
1633 * The idea is to avoid ever returning a disconnected connection
1634 * from dbus_connection_open(). We could just synchronously
1635 * drop our shared ref to the connection on connection disconnect,
1636 * and then assert here that the connection is connected, but
1637 * that causes reentrancy headaches.
1639 CONNECTION_LOCK (connection);
1640 if (_dbus_connection_get_is_connected_unlocked (connection))
1642 _dbus_connection_ref_unlocked (connection);
1643 *result = connection;
1644 _dbus_verbose ("looked up existing connection to server guid %s\n",
1649 _dbus_verbose ("looked up existing connection to server guid %s but it was disconnected so ignoring it\n",
1652 CONNECTION_UNLOCK (connection);
1656 _DBUS_UNLOCK (shared_connections);
1662 connection_record_shared_unlocked (DBusConnection *connection,
1666 char *guid_in_connection;
1668 HAVE_LOCK_CHECK (connection);
1669 _dbus_assert (connection->server_guid == NULL);
1670 _dbus_assert (connection->shareable);
1672 /* get a hard ref on this connection, even if
1673 * we won't in fact store it in the hash, we still
1674 * need to hold a ref on it until it's disconnected.
1676 _dbus_connection_ref_unlocked (connection);
1680 _DBUS_LOCK (shared_connections);
1682 if (!_dbus_list_prepend (&shared_connections_no_guid, connection))
1684 _DBUS_UNLOCK (shared_connections);
1688 _DBUS_UNLOCK (shared_connections);
1689 return TRUE; /* don't store in the hash */
1692 /* A separate copy of the key is required in the hash table, because
1693 * we don't have a lock on the connection when we are doing a hash
1697 guid_key = _dbus_strdup (guid);
1698 if (guid_key == NULL)
1701 guid_in_connection = _dbus_strdup (guid);
1702 if (guid_in_connection == NULL)
1704 dbus_free (guid_key);
1708 _DBUS_LOCK (shared_connections);
1709 _dbus_assert (shared_connections != NULL);
1711 if (!_dbus_hash_table_insert_string (shared_connections,
1712 guid_key, connection))
1714 dbus_free (guid_key);
1715 dbus_free (guid_in_connection);
1716 _DBUS_UNLOCK (shared_connections);
1720 connection->server_guid = guid_in_connection;
1722 _dbus_verbose ("stored connection to %s to be shared\n",
1723 connection->server_guid);
1725 _DBUS_UNLOCK (shared_connections);
1727 _dbus_assert (connection->server_guid != NULL);
1733 connection_forget_shared_unlocked (DBusConnection *connection)
1735 HAVE_LOCK_CHECK (connection);
1737 if (!connection->shareable)
1740 _DBUS_LOCK (shared_connections);
1742 if (connection->server_guid != NULL)
1744 _dbus_verbose ("dropping connection to %s out of the shared table\n",
1745 connection->server_guid);
1747 if (!_dbus_hash_table_remove_string (shared_connections,
1748 connection->server_guid))
1749 _dbus_assert_not_reached ("connection was not in the shared table");
1751 dbus_free (connection->server_guid);
1752 connection->server_guid = NULL;
1756 _dbus_list_remove (&shared_connections_no_guid, connection);
1759 _DBUS_UNLOCK (shared_connections);
1761 /* remove our reference held on all shareable connections */
1762 _dbus_connection_unref_unlocked (connection);
1765 static DBusConnection*
1766 connection_try_from_address_entry (DBusAddressEntry *entry,
1769 DBusTransport *transport;
1770 DBusConnection *connection;
1772 transport = _dbus_transport_open (entry, error);
1774 if (transport == NULL)
1776 _DBUS_ASSERT_ERROR_IS_SET (error);
1780 connection = _dbus_connection_new_for_transport (transport);
1782 _dbus_transport_unref (transport);
1784 if (connection == NULL)
1786 _DBUS_SET_OOM (error);
1790 #ifndef DBUS_DISABLE_CHECKS
1791 _dbus_assert (!connection->have_connection_lock);
1797 * If the shared parameter is true, then any existing connection will
1798 * be used (and if a new connection is created, it will be available
1799 * for use by others). If the shared parameter is false, a new
1800 * connection will always be created, and the new connection will
1801 * never be returned to other callers.
1803 * @param address the address
1804 * @param shared whether the connection is shared or private
1805 * @param error error return
1806 * @returns the connection or #NULL on error
1808 static DBusConnection*
1809 _dbus_connection_open_internal (const char *address,
1813 DBusConnection *connection;
1814 DBusAddressEntry **entries;
1815 DBusError tmp_error = DBUS_ERROR_INIT;
1816 DBusError first_error = DBUS_ERROR_INIT;
1819 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1821 _dbus_verbose ("opening %s connection to: %s\n",
1822 shared ? "shared" : "private", address);
1824 if (!dbus_parse_address (address, &entries, &len, error))
1827 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1831 for (i = 0; i < len; i++)
1835 if (!connection_lookup_shared (entries[i], &connection))
1836 _DBUS_SET_OOM (&tmp_error);
1839 if (connection == NULL)
1841 connection = connection_try_from_address_entry (entries[i],
1844 if (connection != NULL && shared)
1848 connection->shareable = TRUE;
1850 /* guid may be NULL */
1851 guid = dbus_address_entry_get_value (entries[i], "guid");
1853 CONNECTION_LOCK (connection);
1855 if (!connection_record_shared_unlocked (connection, guid))
1857 _DBUS_SET_OOM (&tmp_error);
1858 _dbus_connection_close_possibly_shared_and_unlock (connection);
1859 dbus_connection_unref (connection);
1863 CONNECTION_UNLOCK (connection);
1870 _DBUS_ASSERT_ERROR_IS_SET (&tmp_error);
1873 dbus_move_error (&tmp_error, &first_error);
1875 dbus_error_free (&tmp_error);
1878 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1879 _DBUS_ASSERT_ERROR_IS_CLEAR (&tmp_error);
1881 if (connection == NULL)
1883 _DBUS_ASSERT_ERROR_IS_SET (&first_error);
1884 dbus_move_error (&first_error, error);
1887 dbus_error_free (&first_error);
1889 dbus_address_entries_free (entries);
1894 * Closes a shared OR private connection, while dbus_connection_close() can
1895 * only be used on private connections. Should only be called by the
1896 * dbus code that owns the connection - an owner must be known,
1897 * the open/close state is like malloc/free, not like ref/unref.
1899 * @param connection the connection
1902 _dbus_connection_close_possibly_shared (DBusConnection *connection)
1904 _dbus_assert (connection != NULL);
1905 _dbus_assert (connection->generation == _dbus_current_generation);
1907 CONNECTION_LOCK (connection);
1908 _dbus_connection_close_possibly_shared_and_unlock (connection);
1911 static DBusPreallocatedSend*
1912 _dbus_connection_preallocate_send_unlocked (DBusConnection *connection)
1914 DBusPreallocatedSend *preallocated;
1916 HAVE_LOCK_CHECK (connection);
1918 _dbus_assert (connection != NULL);
1920 preallocated = dbus_new (DBusPreallocatedSend, 1);
1921 if (preallocated == NULL)
1924 preallocated->queue_link = _dbus_list_alloc_link (NULL);
1925 if (preallocated->queue_link == NULL)
1928 preallocated->counter_link = _dbus_list_alloc_link (connection->outgoing_counter);
1929 if (preallocated->counter_link == NULL)
1932 _dbus_counter_ref (preallocated->counter_link->data);
1934 preallocated->connection = connection;
1936 return preallocated;
1939 _dbus_list_free_link (preallocated->queue_link);
1941 dbus_free (preallocated);
1946 /* Called with lock held, does not update dispatch status */
1948 _dbus_connection_send_preallocated_unlocked_no_update (DBusConnection *connection,
1949 DBusPreallocatedSend *preallocated,
1950 DBusMessage *message,
1951 dbus_uint32_t *client_serial)
1953 dbus_uint32_t serial;
1955 preallocated->queue_link->data = message;
1956 _dbus_list_prepend_link (&connection->outgoing_messages,
1957 preallocated->queue_link);
1959 /* It's OK that we'll never call the notify function, because for the
1960 * outgoing limit, there isn't one */
1961 _dbus_message_add_counter_link (message,
1962 preallocated->counter_link);
1964 dbus_free (preallocated);
1965 preallocated = NULL;
1967 dbus_message_ref (message);
1969 connection->n_outgoing += 1;
1971 _dbus_verbose ("Message %p (%s %s %s %s '%s') for %s added to outgoing queue %p, %d pending to send\n",
1973 dbus_message_type_to_string (dbus_message_get_type (message)),
1974 dbus_message_get_path (message) ?
1975 dbus_message_get_path (message) :
1977 dbus_message_get_interface (message) ?
1978 dbus_message_get_interface (message) :
1980 dbus_message_get_member (message) ?
1981 dbus_message_get_member (message) :
1983 dbus_message_get_signature (message),
1984 dbus_message_get_destination (message) ?
1985 dbus_message_get_destination (message) :
1988 connection->n_outgoing);
1990 if (dbus_message_get_serial (message) == 0)
1992 serial = _dbus_connection_get_next_client_serial (connection);
1993 dbus_message_set_serial (message, serial);
1995 *client_serial = serial;
2000 *client_serial = dbus_message_get_serial (message);
2003 _dbus_verbose ("Message %p serial is %u\n",
2004 message, dbus_message_get_serial (message));
2006 dbus_message_lock (message);
2008 /* Now we need to run an iteration to hopefully just write the messages
2009 * out immediately, and otherwise get them queued up
2011 _dbus_connection_do_iteration_unlocked (connection,
2013 DBUS_ITERATION_DO_WRITING,
2016 /* If stuff is still queued up, be sure we wake up the main loop */
2017 if (connection->n_outgoing > 0)
2018 _dbus_connection_wakeup_mainloop (connection);
2022 _dbus_connection_send_preallocated_and_unlock (DBusConnection *connection,
2023 DBusPreallocatedSend *preallocated,
2024 DBusMessage *message,
2025 dbus_uint32_t *client_serial)
2027 DBusDispatchStatus status;
2029 HAVE_LOCK_CHECK (connection);
2031 _dbus_connection_send_preallocated_unlocked_no_update (connection,
2033 message, client_serial);
2035 _dbus_verbose ("middle\n");
2036 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2038 /* this calls out to user code */
2039 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2043 * Like dbus_connection_send(), but assumes the connection
2044 * is already locked on function entry, and unlocks before returning.
2046 * @param connection the connection
2047 * @param message the message to send
2048 * @param client_serial return location for client serial of sent message
2049 * @returns #FALSE on out-of-memory
2052 _dbus_connection_send_and_unlock (DBusConnection *connection,
2053 DBusMessage *message,
2054 dbus_uint32_t *client_serial)
2056 DBusPreallocatedSend *preallocated;
2058 _dbus_assert (connection != NULL);
2059 _dbus_assert (message != NULL);
2061 preallocated = _dbus_connection_preallocate_send_unlocked (connection);
2062 if (preallocated == NULL)
2064 CONNECTION_UNLOCK (connection);
2068 _dbus_connection_send_preallocated_and_unlock (connection,
2076 * Used internally to handle the semantics of dbus_server_set_new_connection_function().
2077 * If the new connection function does not ref the connection, we want to close it.
2079 * A bit of a hack, probably the new connection function should have returned a value
2080 * for whether to close, or should have had to close the connection itself if it
2083 * But, this works OK as long as the new connection function doesn't do anything
2084 * crazy like keep the connection around without ref'ing it.
2086 * We have to lock the connection across refcount check and close in case
2087 * the new connection function spawns a thread that closes and unrefs.
2088 * In that case, if the app thread
2089 * closes and unrefs first, we'll harmlessly close again; if the app thread
2090 * still has the ref, we'll close and then the app will close harmlessly.
2091 * If the app unrefs without closing, the app is broken since if the
2092 * app refs from the new connection function it is supposed to also close.
2094 * If we didn't atomically check the refcount and close with the lock held
2095 * though, we could screw this up.
2097 * @param connection the connection
2100 _dbus_connection_close_if_only_one_ref (DBusConnection *connection)
2102 dbus_int32_t refcount;
2104 CONNECTION_LOCK (connection);
2106 refcount = _dbus_atomic_get (&connection->refcount);
2107 /* The caller should have at least one ref */
2108 _dbus_assert (refcount >= 1);
2111 _dbus_connection_close_possibly_shared_and_unlock (connection);
2113 CONNECTION_UNLOCK (connection);
2118 * When a function that blocks has been called with a timeout, and we
2119 * run out of memory, the time to wait for memory is based on the
2120 * timeout. If the caller was willing to block a long time we wait a
2121 * relatively long time for memory, if they were only willing to block
2122 * briefly then we retry for memory at a rapid rate.
2124 * @timeout_milliseconds the timeout requested for blocking
2127 _dbus_memory_pause_based_on_timeout (int timeout_milliseconds)
2129 if (timeout_milliseconds == -1)
2130 _dbus_sleep_milliseconds (1000);
2131 else if (timeout_milliseconds < 100)
2132 ; /* just busy loop */
2133 else if (timeout_milliseconds <= 1000)
2134 _dbus_sleep_milliseconds (timeout_milliseconds / 3);
2136 _dbus_sleep_milliseconds (1000);
2139 static DBusMessage *
2140 generate_local_error_message (dbus_uint32_t serial,
2144 DBusMessage *message;
2145 message = dbus_message_new (DBUS_MESSAGE_TYPE_ERROR);
2149 if (!dbus_message_set_error_name (message, error_name))
2151 dbus_message_unref (message);
2156 dbus_message_set_no_reply (message, TRUE);
2158 if (!dbus_message_set_reply_serial (message,
2161 dbus_message_unref (message);
2166 if (error_msg != NULL)
2168 DBusMessageIter iter;
2170 dbus_message_iter_init_append (message, &iter);
2171 if (!dbus_message_iter_append_basic (&iter,
2175 dbus_message_unref (message);
2186 * Peek the incoming queue to see if we got reply for a specific serial
2189 _dbus_connection_peek_for_reply_unlocked (DBusConnection *connection,
2190 dbus_uint32_t client_serial)
2193 HAVE_LOCK_CHECK (connection);
2195 link = _dbus_list_get_first_link (&connection->incoming_messages);
2197 while (link != NULL)
2199 DBusMessage *reply = link->data;
2201 if (dbus_message_get_reply_serial (reply) == client_serial)
2203 _dbus_verbose ("%s reply to %d found in queue\n", _DBUS_FUNCTION_NAME, client_serial);
2206 link = _dbus_list_get_next_link (&connection->incoming_messages, link);
2212 /* This is slightly strange since we can pop a message here without
2213 * the dispatch lock.
2216 check_for_reply_unlocked (DBusConnection *connection,
2217 dbus_uint32_t client_serial)
2221 HAVE_LOCK_CHECK (connection);
2223 link = _dbus_list_get_first_link (&connection->incoming_messages);
2225 while (link != NULL)
2227 DBusMessage *reply = link->data;
2229 if (dbus_message_get_reply_serial (reply) == client_serial)
2231 _dbus_list_remove_link (&connection->incoming_messages, link);
2232 connection->n_incoming -= 1;
2235 link = _dbus_list_get_next_link (&connection->incoming_messages, link);
2242 connection_timeout_and_complete_all_pending_calls_unlocked (DBusConnection *connection)
2244 /* We can't iterate over the hash in the normal way since we'll be
2245 * dropping the lock for each item. So we restart the
2246 * iter each time as we drain the hash table.
2249 while (_dbus_hash_table_get_n_entries (connection->pending_replies) > 0)
2251 DBusPendingCall *pending;
2254 _dbus_hash_iter_init (connection->pending_replies, &iter);
2255 _dbus_hash_iter_next (&iter);
2257 pending = _dbus_hash_iter_get_value (&iter);
2258 _dbus_pending_call_ref_unlocked (pending);
2260 _dbus_pending_call_queue_timeout_error_unlocked (pending,
2263 if (_dbus_pending_call_is_timeout_added_unlocked (pending))
2264 _dbus_connection_remove_timeout_unlocked (connection,
2265 _dbus_pending_call_get_timeout_unlocked (pending));
2266 _dbus_pending_call_set_timeout_added_unlocked (pending, FALSE);
2267 _dbus_hash_iter_remove_entry (&iter);
2269 _dbus_pending_call_unref_and_unlock (pending);
2270 CONNECTION_LOCK (connection);
2272 HAVE_LOCK_CHECK (connection);
2276 complete_pending_call_and_unlock (DBusConnection *connection,
2277 DBusPendingCall *pending,
2278 DBusMessage *message)
2280 _dbus_pending_call_set_reply_unlocked (pending, message);
2281 _dbus_pending_call_ref_unlocked (pending); /* in case there's no app with a ref held */
2282 _dbus_connection_detach_pending_call_and_unlock (connection, pending);
2284 /* Must be called unlocked since it invokes app callback */
2285 _dbus_pending_call_complete (pending);
2286 dbus_pending_call_unref (pending);
2290 check_for_reply_and_update_dispatch_unlocked (DBusConnection *connection,
2291 DBusPendingCall *pending)
2294 DBusDispatchStatus status;
2296 reply = check_for_reply_unlocked (connection,
2297 _dbus_pending_call_get_reply_serial_unlocked (pending));
2300 _dbus_verbose ("checked for reply\n");
2302 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): got reply\n");
2304 complete_pending_call_and_unlock (connection, pending, reply);
2305 dbus_message_unref (reply);
2307 CONNECTION_LOCK (connection);
2308 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2309 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2310 dbus_pending_call_unref (pending);
2319 * Blocks until a pending call times out or gets a reply.
2321 * Does not re-enter the main loop or run filter/path-registered
2322 * callbacks. The reply to the message will not be seen by
2325 * Returns immediately if pending call already got a reply.
2327 * @todo could use performance improvements (it keeps scanning
2328 * the whole message queue for example)
2330 * @param pending the pending call we block for a reply on
2333 _dbus_connection_block_pending_call (DBusPendingCall *pending)
2335 long start_tv_sec, start_tv_usec;
2336 long tv_sec, tv_usec;
2337 DBusDispatchStatus status;
2338 DBusConnection *connection;
2339 dbus_uint32_t client_serial;
2340 DBusTimeout *timeout;
2341 int timeout_milliseconds, elapsed_milliseconds;
2343 _dbus_assert (pending != NULL);
2345 if (dbus_pending_call_get_completed (pending))
2348 dbus_pending_call_ref (pending); /* necessary because the call could be canceled */
2350 connection = _dbus_pending_call_get_connection_and_lock (pending);
2352 /* Flush message queue - note, can affect dispatch status */
2353 _dbus_connection_flush_unlocked (connection);
2355 client_serial = _dbus_pending_call_get_reply_serial_unlocked (pending);
2357 /* note that timeout_milliseconds is limited to a smallish value
2358 * in _dbus_pending_call_new() so overflows aren't possible
2361 timeout = _dbus_pending_call_get_timeout_unlocked (pending);
2362 _dbus_get_current_time (&start_tv_sec, &start_tv_usec);
2365 timeout_milliseconds = dbus_timeout_get_interval (timeout);
2367 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): will block %d milliseconds for reply serial %u from %ld sec %ld usec\n",
2368 timeout_milliseconds,
2370 start_tv_sec, start_tv_usec);
2374 timeout_milliseconds = -1;
2376 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): will block for reply serial %u\n", client_serial);
2379 /* check to see if we already got the data off the socket */
2380 /* from another blocked pending call */
2381 if (check_for_reply_and_update_dispatch_unlocked (connection, pending))
2384 /* Now we wait... */
2385 /* always block at least once as we know we don't have the reply yet */
2386 _dbus_connection_do_iteration_unlocked (connection,
2388 DBUS_ITERATION_DO_READING |
2389 DBUS_ITERATION_BLOCK,
2390 timeout_milliseconds);
2394 _dbus_verbose ("top of recheck\n");
2396 HAVE_LOCK_CHECK (connection);
2398 /* queue messages and get status */
2400 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2402 /* the get_completed() is in case a dispatch() while we were blocking
2403 * got the reply instead of us.
2405 if (_dbus_pending_call_get_completed_unlocked (pending))
2407 _dbus_verbose ("Pending call completed by dispatch\n");
2408 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2409 dbus_pending_call_unref (pending);
2413 if (status == DBUS_DISPATCH_DATA_REMAINS)
2415 if (check_for_reply_and_update_dispatch_unlocked (connection, pending))
2419 _dbus_get_current_time (&tv_sec, &tv_usec);
2420 elapsed_milliseconds = (tv_sec - start_tv_sec) * 1000 +
2421 (tv_usec - start_tv_usec) / 1000;
2423 if (!_dbus_connection_get_is_connected_unlocked (connection))
2425 DBusMessage *error_msg;
2427 error_msg = generate_local_error_message (client_serial,
2428 DBUS_ERROR_DISCONNECTED,
2429 "Connection was disconnected before a reply was received");
2431 /* on OOM error_msg is set to NULL */
2432 complete_pending_call_and_unlock (connection, pending, error_msg);
2433 dbus_pending_call_unref (pending);
2436 else if (connection->disconnect_message_link == NULL)
2437 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): disconnected\n");
2438 else if (timeout == NULL)
2440 if (status == DBUS_DISPATCH_NEED_MEMORY)
2442 /* Try sleeping a bit, as we aren't sure we need to block for reading,
2443 * we may already have a reply in the buffer and just can't process
2446 _dbus_verbose ("dbus_connection_send_with_reply_and_block() waiting for more memory\n");
2448 _dbus_memory_pause_based_on_timeout (timeout_milliseconds - elapsed_milliseconds);
2452 /* block again, we don't have the reply buffered yet. */
2453 _dbus_connection_do_iteration_unlocked (connection,
2455 DBUS_ITERATION_DO_READING |
2456 DBUS_ITERATION_BLOCK,
2457 timeout_milliseconds - elapsed_milliseconds);
2460 goto recheck_status;
2462 else if (tv_sec < start_tv_sec)
2463 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): clock set backward\n");
2464 else if (elapsed_milliseconds < timeout_milliseconds)
2466 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): %d milliseconds remain\n", timeout_milliseconds - elapsed_milliseconds);
2468 if (status == DBUS_DISPATCH_NEED_MEMORY)
2470 /* Try sleeping a bit, as we aren't sure we need to block for reading,
2471 * we may already have a reply in the buffer and just can't process
2474 _dbus_verbose ("dbus_connection_send_with_reply_and_block() waiting for more memory\n");
2476 _dbus_memory_pause_based_on_timeout (timeout_milliseconds - elapsed_milliseconds);
2480 /* block again, we don't have the reply buffered yet. */
2481 _dbus_connection_do_iteration_unlocked (connection,
2483 DBUS_ITERATION_DO_READING |
2484 DBUS_ITERATION_BLOCK,
2485 timeout_milliseconds - elapsed_milliseconds);
2488 goto recheck_status;
2491 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): Waited %d milliseconds and got no reply\n",
2492 elapsed_milliseconds);
2494 _dbus_assert (!_dbus_pending_call_get_completed_unlocked (pending));
2496 /* unlock and call user code */
2497 complete_pending_call_and_unlock (connection, pending, NULL);
2499 /* update user code on dispatch status */
2500 CONNECTION_LOCK (connection);
2501 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2502 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2503 dbus_pending_call_unref (pending);
2509 * @addtogroup DBusConnection
2515 * Gets a connection to a remote address. If a connection to the given
2516 * address already exists, returns the existing connection with its
2517 * reference count incremented. Otherwise, returns a new connection
2518 * and saves the new connection for possible re-use if a future call
2519 * to dbus_connection_open() asks to connect to the same server.
2521 * Use dbus_connection_open_private() to get a dedicated connection
2522 * not shared with other callers of dbus_connection_open().
2524 * If the open fails, the function returns #NULL, and provides a
2525 * reason for the failure in the error parameter. Pass #NULL for the
2526 * error parameter if you aren't interested in the reason for
2529 * Because this connection is shared, no user of the connection
2530 * may call dbus_connection_close(). However, when you are done with the
2531 * connection you should call dbus_connection_unref().
2533 * @note Prefer dbus_connection_open() to dbus_connection_open_private()
2534 * unless you have good reason; connections are expensive enough
2535 * that it's wasteful to create lots of connections to the same
2538 * @param address the address.
2539 * @param error address where an error can be returned.
2540 * @returns new connection, or #NULL on failure.
2543 dbus_connection_open (const char *address,
2546 DBusConnection *connection;
2548 _dbus_return_val_if_fail (address != NULL, NULL);
2549 _dbus_return_val_if_error_is_set (error, NULL);
2551 connection = _dbus_connection_open_internal (address,
2559 * Opens a new, dedicated connection to a remote address. Unlike
2560 * dbus_connection_open(), always creates a new connection.
2561 * This connection will not be saved or recycled by libdbus.
2563 * If the open fails, the function returns #NULL, and provides a
2564 * reason for the failure in the error parameter. Pass #NULL for the
2565 * error parameter if you aren't interested in the reason for
2568 * When you are done with this connection, you must
2569 * dbus_connection_close() to disconnect it,
2570 * and dbus_connection_unref() to free the connection object.
2572 * (The dbus_connection_close() can be skipped if the
2573 * connection is already known to be disconnected, for example
2574 * if you are inside a handler for the Disconnected signal.)
2576 * @note Prefer dbus_connection_open() to dbus_connection_open_private()
2577 * unless you have good reason; connections are expensive enough
2578 * that it's wasteful to create lots of connections to the same
2581 * @param address the address.
2582 * @param error address where an error can be returned.
2583 * @returns new connection, or #NULL on failure.
2586 dbus_connection_open_private (const char *address,
2589 DBusConnection *connection;
2591 _dbus_return_val_if_fail (address != NULL, NULL);
2592 _dbus_return_val_if_error_is_set (error, NULL);
2594 connection = _dbus_connection_open_internal (address,
2602 * Increments the reference count of a DBusConnection.
2604 * @param connection the connection.
2605 * @returns the connection.
2608 dbus_connection_ref (DBusConnection *connection)
2610 _dbus_return_val_if_fail (connection != NULL, NULL);
2611 _dbus_return_val_if_fail (connection->generation == _dbus_current_generation, NULL);
2613 _dbus_atomic_inc (&connection->refcount);
2619 free_outgoing_message (void *element,
2622 DBusMessage *message = element;
2623 DBusConnection *connection = data;
2625 _dbus_message_remove_counter (message, connection->outgoing_counter);
2626 dbus_message_unref (message);
2629 /* This is run without the mutex held, but after the last reference
2630 * to the connection has been dropped we should have no thread-related
2634 _dbus_connection_last_unref (DBusConnection *connection)
2638 _dbus_verbose ("Finalizing connection %p\n", connection);
2640 _dbus_assert (_dbus_atomic_get (&connection->refcount) == 0);
2642 /* You have to disconnect the connection before unref:ing it. Otherwise
2643 * you won't get the disconnected message.
2645 _dbus_assert (!_dbus_transport_get_is_connected (connection->transport));
2646 _dbus_assert (connection->server_guid == NULL);
2648 /* ---- We're going to call various application callbacks here, hope it doesn't break anything... */
2649 _dbus_object_tree_free_all_unlocked (connection->objects);
2651 dbus_connection_set_dispatch_status_function (connection, NULL, NULL, NULL);
2652 dbus_connection_set_wakeup_main_function (connection, NULL, NULL, NULL);
2653 dbus_connection_set_unix_user_function (connection, NULL, NULL, NULL);
2655 _dbus_watch_list_free (connection->watches);
2656 connection->watches = NULL;
2658 _dbus_timeout_list_free (connection->timeouts);
2659 connection->timeouts = NULL;
2661 _dbus_data_slot_list_free (&connection->slot_list);
2663 link = _dbus_list_get_first_link (&connection->filter_list);
2664 while (link != NULL)
2666 DBusMessageFilter *filter = link->data;
2667 DBusList *next = _dbus_list_get_next_link (&connection->filter_list, link);
2669 filter->function = NULL;
2670 _dbus_message_filter_unref (filter); /* calls app callback */
2675 _dbus_list_clear (&connection->filter_list);
2677 /* ---- Done with stuff that invokes application callbacks */
2679 _dbus_object_tree_unref (connection->objects);
2681 _dbus_hash_table_unref (connection->pending_replies);
2682 connection->pending_replies = NULL;
2684 _dbus_list_clear (&connection->filter_list);
2686 _dbus_list_foreach (&connection->outgoing_messages,
2687 free_outgoing_message,
2689 _dbus_list_clear (&connection->outgoing_messages);
2691 _dbus_list_foreach (&connection->incoming_messages,
2692 (DBusForeachFunction) dbus_message_unref,
2694 _dbus_list_clear (&connection->incoming_messages);
2696 _dbus_counter_unref (connection->outgoing_counter);
2698 _dbus_transport_unref (connection->transport);
2700 if (connection->disconnect_message_link)
2702 DBusMessage *message = connection->disconnect_message_link->data;
2703 dbus_message_unref (message);
2704 _dbus_list_free_link (connection->disconnect_message_link);
2707 _dbus_condvar_free_at_location (&connection->dispatch_cond);
2708 _dbus_condvar_free_at_location (&connection->io_path_cond);
2710 _dbus_mutex_free_at_location (&connection->io_path_mutex);
2711 _dbus_mutex_free_at_location (&connection->dispatch_mutex);
2713 _dbus_mutex_free_at_location (&connection->slot_mutex);
2715 _dbus_mutex_free_at_location (&connection->mutex);
2717 dbus_free (connection);
2721 * Decrements the reference count of a DBusConnection, and finalizes
2722 * it if the count reaches zero.
2724 * Note: it is a bug to drop the last reference to a connection that
2725 * is still connected.
2727 * For shared connections, libdbus will own a reference
2728 * as long as the connection is connected, so you can know that either
2729 * you don't have the last reference, or it's OK to drop the last reference.
2730 * Most connections are shared. dbus_connection_open() and dbus_bus_get()
2731 * return shared connections.
2733 * For private connections, the creator of the connection must arrange for
2734 * dbus_connection_close() to be called prior to dropping the last reference.
2735 * Private connections come from dbus_connection_open_private() or dbus_bus_get_private().
2737 * @param connection the connection.
2740 dbus_connection_unref (DBusConnection *connection)
2742 dbus_bool_t last_unref;
2744 _dbus_return_if_fail (connection != NULL);
2745 _dbus_return_if_fail (connection->generation == _dbus_current_generation);
2747 last_unref = (_dbus_atomic_dec (&connection->refcount) == 1);
2751 #ifndef DBUS_DISABLE_CHECKS
2752 if (_dbus_transport_get_is_connected (connection->transport))
2754 _dbus_warn_check_failed ("The last reference on a connection was dropped without closing the connection. This is a bug in an application. See dbus_connection_unref() documentation for details.\n%s",
2755 connection->shareable ?
2756 "Most likely, the application called unref() too many times and removed a reference belonging to libdbus, since this is a shared connection.\n" :
2757 "Most likely, the application was supposed to call dbus_connection_close(), since this is a private connection.\n");
2761 _dbus_connection_last_unref (connection);
2766 * Note that the transport can disconnect itself (other end drops us)
2767 * and in that case this function never runs. So this function must
2768 * not do anything more than disconnect the transport and update the
2771 * If the transport self-disconnects, then we assume someone will
2772 * dispatch the connection to cause the dispatch status update.
2775 _dbus_connection_close_possibly_shared_and_unlock (DBusConnection *connection)
2777 DBusDispatchStatus status;
2779 HAVE_LOCK_CHECK (connection);
2781 _dbus_verbose ("Disconnecting %p\n", connection);
2783 /* We need to ref because update_dispatch_status_and_unlock will unref
2784 * the connection if it was shared and libdbus was the only remaining
2787 _dbus_connection_ref_unlocked (connection);
2789 _dbus_transport_disconnect (connection->transport);
2791 /* This has the side effect of queuing the disconnect message link
2792 * (unless we don't have enough memory, possibly, so don't assert it).
2793 * After the disconnect message link is queued, dbus_bus_get/dbus_connection_open
2794 * should never again return the newly-disconnected connection.
2796 * However, we only unref the shared connection and exit_on_disconnect when
2797 * the disconnect message reaches the head of the message queue,
2798 * NOT when it's first queued.
2800 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2802 /* This calls out to user code */
2803 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2805 /* Could also call out to user code */
2806 dbus_connection_unref (connection);
2810 * Closes a private connection, so no further data can be sent or received.
2811 * This disconnects the transport (such as a socket) underlying the
2814 * Attempts to send messages after closing a connection are safe, but will result in
2815 * error replies generated locally in libdbus.
2817 * This function does not affect the connection's reference count. It's
2818 * safe to close a connection more than once; all calls after the
2819 * first do nothing. It's impossible to "reopen" a connection, a
2820 * new connection must be created. This function may result in a call
2821 * to the DBusDispatchStatusFunction set with
2822 * dbus_connection_set_dispatch_status_function(), as the disconnect
2823 * message it generates needs to be dispatched.
2825 * If a connection is dropped by the remote application, it will
2828 * You must close a connection prior to releasing the last reference to
2829 * the connection. If you dbus_connection_unref() for the last time
2830 * without closing the connection, the results are undefined; it
2831 * is a bug in your program and libdbus will try to print a warning.
2833 * You may not close a shared connection. Connections created with
2834 * dbus_connection_open() or dbus_bus_get() are shared.
2835 * These connections are owned by libdbus, and applications should
2836 * only unref them, never close them. Applications can know it is
2837 * safe to unref these connections because libdbus will be holding a
2838 * reference as long as the connection is open. Thus, either the
2839 * connection is closed and it is OK to drop the last reference,
2840 * or the connection is open and the app knows it does not have the
2843 * Connections created with dbus_connection_open_private() or
2844 * dbus_bus_get_private() are not kept track of or referenced by
2845 * libdbus. The creator of these connections is responsible for
2846 * calling dbus_connection_close() prior to releasing the last
2847 * reference, if the connection is not already disconnected.
2849 * @param connection the private (unshared) connection to close
2852 dbus_connection_close (DBusConnection *connection)
2854 _dbus_return_if_fail (connection != NULL);
2855 _dbus_return_if_fail (connection->generation == _dbus_current_generation);
2857 CONNECTION_LOCK (connection);
2859 #ifndef DBUS_DISABLE_CHECKS
2860 if (connection->shareable)
2862 CONNECTION_UNLOCK (connection);
2864 _dbus_warn_check_failed ("Applications must not close shared connections - see dbus_connection_close() docs. This is a bug in the application.\n");
2869 _dbus_connection_close_possibly_shared_and_unlock (connection);
2873 _dbus_connection_get_is_connected_unlocked (DBusConnection *connection)
2875 HAVE_LOCK_CHECK (connection);
2876 return _dbus_transport_get_is_connected (connection->transport);
2880 * Gets whether the connection is currently open. A connection may
2881 * become disconnected when the remote application closes its end, or
2882 * exits; a connection may also be disconnected with
2883 * dbus_connection_close().
2885 * There are not separate states for "closed" and "disconnected," the two
2886 * terms are synonymous. This function should really be called
2887 * get_is_open() but for historical reasons is not.
2889 * @param connection the connection.
2890 * @returns #TRUE if the connection is still alive.
2893 dbus_connection_get_is_connected (DBusConnection *connection)
2897 _dbus_return_val_if_fail (connection != NULL, FALSE);
2899 CONNECTION_LOCK (connection);
2900 res = _dbus_connection_get_is_connected_unlocked (connection);
2901 CONNECTION_UNLOCK (connection);
2907 * Gets whether the connection was authenticated. (Note that
2908 * if the connection was authenticated then disconnected,
2909 * this function still returns #TRUE)
2911 * @param connection the connection
2912 * @returns #TRUE if the connection was ever authenticated
2915 dbus_connection_get_is_authenticated (DBusConnection *connection)
2919 _dbus_return_val_if_fail (connection != NULL, FALSE);
2921 CONNECTION_LOCK (connection);
2922 res = _dbus_transport_get_is_authenticated (connection->transport);
2923 CONNECTION_UNLOCK (connection);
2929 * Gets whether the connection is not authenticated as a specific
2930 * user. If the connection is not authenticated, this function
2931 * returns #TRUE, and if it is authenticated but as an anonymous user,
2932 * it returns #TRUE. If it is authenticated as a specific user, then
2933 * this returns #FALSE. (Note that if the connection was authenticated
2934 * as anonymous then disconnected, this function still returns #TRUE.)
2936 * If the connection is not anonymous, you can use
2937 * dbus_connection_get_unix_user() and
2938 * dbus_connection_get_windows_user() to see who it's authorized as.
2940 * If you want to prevent non-anonymous authorization, use
2941 * dbus_server_set_auth_mechanisms() to remove the mechanisms that
2942 * allow proving user identity (i.e. only allow the ANONYMOUS
2945 * @param connection the connection
2946 * @returns #TRUE if not authenticated or authenticated as anonymous
2949 dbus_connection_get_is_anonymous (DBusConnection *connection)
2953 _dbus_return_val_if_fail (connection != NULL, FALSE);
2955 CONNECTION_LOCK (connection);
2956 res = _dbus_transport_get_is_anonymous (connection->transport);
2957 CONNECTION_UNLOCK (connection);
2963 * Gets the ID of the server address we are authenticated to, if this
2964 * connection is on the client side. If the connection is on the
2965 * server side, this will always return #NULL - use dbus_server_get_id()
2966 * to get the ID of your own server, if you are the server side.
2968 * If a client-side connection is not authenticated yet, the ID may be
2969 * available if it was included in the server address, but may not be
2970 * available. The only way to be sure the server ID is available
2971 * is to wait for authentication to complete.
2973 * In general, each mode of connecting to a given server will have
2974 * its own ID. So for example, if the session bus daemon is listening
2975 * on UNIX domain sockets and on TCP, then each of those modalities
2976 * will have its own server ID.
2978 * If you want an ID that identifies an entire session bus, look at
2979 * dbus_bus_get_id() instead (which is just a convenience wrapper
2980 * around the org.freedesktop.DBus.GetId method invoked on the bus).
2982 * You can also get a machine ID; see dbus_get_local_machine_id() to
2983 * get the machine you are on. There isn't a convenience wrapper, but
2984 * you can invoke org.freedesktop.DBus.Peer.GetMachineId on any peer
2985 * to get the machine ID on the other end.
2987 * The D-Bus specification describes the server ID and other IDs in a
2990 * @param connection the connection
2991 * @returns the server ID or #NULL if no memory or the connection is server-side
2994 dbus_connection_get_server_id (DBusConnection *connection)
2998 _dbus_return_val_if_fail (connection != NULL, NULL);
3000 CONNECTION_LOCK (connection);
3001 id = _dbus_strdup (_dbus_transport_get_server_id (connection->transport));
3002 CONNECTION_UNLOCK (connection);
3008 * Tests whether a certain type can be send via the connection. This
3009 * will always return TRUE for all types, with the exception of
3010 * DBUS_TYPE_UNIX_FD. The function will return TRUE for
3011 * DBUS_TYPE_UNIX_FD only on systems that know Unix file descriptors
3012 * and can send them via the chosen transport and when the remote side
3015 * This function can be used to do runtime checking for types that
3016 * might be unknown to the specific D-Bus client implementation
3017 * version, i.e. it will return FALSE for all types this
3018 * implementation does not know, including invalid or reserved types.
3020 * @param connection the connection
3021 * @param type the type to check
3022 * @returns TRUE if the type may be send via the connection
3025 dbus_connection_can_send_type(DBusConnection *connection,
3028 _dbus_return_val_if_fail (connection != NULL, FALSE);
3030 if (!dbus_type_is_valid (type))
3033 if (type != DBUS_TYPE_UNIX_FD)
3036 #ifdef HAVE_UNIX_FD_PASSING
3040 CONNECTION_LOCK(connection);
3041 b = _dbus_transport_can_pass_unix_fd(connection->transport);
3042 CONNECTION_UNLOCK(connection);
3052 * Set whether _exit() should be called when the connection receives a
3053 * disconnect signal. The call to _exit() comes after any handlers for
3054 * the disconnect signal run; handlers can cancel the exit by calling
3057 * By default, exit_on_disconnect is #FALSE; but for message bus
3058 * connections returned from dbus_bus_get() it will be toggled on
3061 * @param connection the connection
3062 * @param exit_on_disconnect #TRUE if _exit() should be called after a disconnect signal
3065 dbus_connection_set_exit_on_disconnect (DBusConnection *connection,
3066 dbus_bool_t exit_on_disconnect)
3068 _dbus_return_if_fail (connection != NULL);
3070 CONNECTION_LOCK (connection);
3071 connection->exit_on_disconnect = exit_on_disconnect != FALSE;
3072 CONNECTION_UNLOCK (connection);
3076 * Preallocates resources needed to send a message, allowing the message
3077 * to be sent without the possibility of memory allocation failure.
3078 * Allows apps to create a future guarantee that they can send
3079 * a message regardless of memory shortages.
3081 * @param connection the connection we're preallocating for.
3082 * @returns the preallocated resources, or #NULL
3084 DBusPreallocatedSend*
3085 dbus_connection_preallocate_send (DBusConnection *connection)
3087 DBusPreallocatedSend *preallocated;
3089 _dbus_return_val_if_fail (connection != NULL, NULL);
3091 CONNECTION_LOCK (connection);
3094 _dbus_connection_preallocate_send_unlocked (connection);
3096 CONNECTION_UNLOCK (connection);
3098 return preallocated;
3102 * Frees preallocated message-sending resources from
3103 * dbus_connection_preallocate_send(). Should only
3104 * be called if the preallocated resources are not used
3105 * to send a message.
3107 * @param connection the connection
3108 * @param preallocated the resources
3111 dbus_connection_free_preallocated_send (DBusConnection *connection,
3112 DBusPreallocatedSend *preallocated)
3114 _dbus_return_if_fail (connection != NULL);
3115 _dbus_return_if_fail (preallocated != NULL);
3116 _dbus_return_if_fail (connection == preallocated->connection);
3118 _dbus_list_free_link (preallocated->queue_link);
3119 _dbus_counter_unref (preallocated->counter_link->data);
3120 _dbus_list_free_link (preallocated->counter_link);
3121 dbus_free (preallocated);
3125 * Sends a message using preallocated resources. This function cannot fail.
3126 * It works identically to dbus_connection_send() in other respects.
3127 * Preallocated resources comes from dbus_connection_preallocate_send().
3128 * This function "consumes" the preallocated resources, they need not
3129 * be freed separately.
3131 * @param connection the connection
3132 * @param preallocated the preallocated resources
3133 * @param message the message to send
3134 * @param client_serial return location for client serial assigned to the message
3137 dbus_connection_send_preallocated (DBusConnection *connection,
3138 DBusPreallocatedSend *preallocated,
3139 DBusMessage *message,
3140 dbus_uint32_t *client_serial)
3142 _dbus_return_if_fail (connection != NULL);
3143 _dbus_return_if_fail (preallocated != NULL);
3144 _dbus_return_if_fail (message != NULL);
3145 _dbus_return_if_fail (preallocated->connection == connection);
3146 _dbus_return_if_fail (dbus_message_get_type (message) != DBUS_MESSAGE_TYPE_METHOD_CALL ||
3147 dbus_message_get_member (message) != NULL);
3148 _dbus_return_if_fail (dbus_message_get_type (message) != DBUS_MESSAGE_TYPE_SIGNAL ||
3149 (dbus_message_get_interface (message) != NULL &&
3150 dbus_message_get_member (message) != NULL));
3152 CONNECTION_LOCK (connection);
3154 #ifdef HAVE_UNIX_FD_PASSING
3156 if (!_dbus_transport_can_pass_unix_fd(connection->transport) &&
3157 message->n_unix_fds > 0)
3159 /* Refuse to send fds on a connection that cannot handle
3160 them. Unfortunately we cannot return a proper error here, so
3161 the best we can is just return. */
3162 CONNECTION_UNLOCK (connection);
3168 _dbus_connection_send_preallocated_and_unlock (connection,
3170 message, client_serial);
3174 _dbus_connection_send_unlocked_no_update (DBusConnection *connection,
3175 DBusMessage *message,
3176 dbus_uint32_t *client_serial)
3178 DBusPreallocatedSend *preallocated;
3180 _dbus_assert (connection != NULL);
3181 _dbus_assert (message != NULL);
3183 preallocated = _dbus_connection_preallocate_send_unlocked (connection);
3184 if (preallocated == NULL)
3187 _dbus_connection_send_preallocated_unlocked_no_update (connection,
3195 * Adds a message to the outgoing message queue. Does not block to
3196 * write the message to the network; that happens asynchronously. To
3197 * force the message to be written, call dbus_connection_flush() however
3198 * it is not necessary to call dbus_connection_flush() by hand; the
3199 * message will be sent the next time the main loop is run.
3200 * dbus_connection_flush() should only be used, for example, if
3201 * the application was expected to exit before running the main loop.
3203 * Because this only queues the message, the only reason it can
3204 * fail is lack of memory. Even if the connection is disconnected,
3205 * no error will be returned. If the function fails due to lack of memory,
3206 * it returns #FALSE. The function will never fail for other reasons; even
3207 * if the connection is disconnected, you can queue an outgoing message,
3208 * though obviously it won't be sent.
3210 * The message serial is used by the remote application to send a
3211 * reply; see dbus_message_get_serial() or the D-Bus specification.
3213 * dbus_message_unref() can be called as soon as this method returns
3214 * as the message queue will hold its own ref until the message is sent.
3216 * @param connection the connection.
3217 * @param message the message to write.
3218 * @param serial return location for message serial, or #NULL if you don't care
3219 * @returns #TRUE on success.
3222 dbus_connection_send (DBusConnection *connection,
3223 DBusMessage *message,
3224 dbus_uint32_t *serial)
3226 _dbus_return_val_if_fail (connection != NULL, FALSE);
3227 _dbus_return_val_if_fail (message != NULL, FALSE);
3229 CONNECTION_LOCK (connection);
3231 #ifdef HAVE_UNIX_FD_PASSING
3233 if (!_dbus_transport_can_pass_unix_fd(connection->transport) &&
3234 message->n_unix_fds > 0)
3236 /* Refuse to send fds on a connection that cannot handle
3237 them. Unfortunately we cannot return a proper error here, so
3238 the best we can is just return. */
3239 CONNECTION_UNLOCK (connection);
3245 return _dbus_connection_send_and_unlock (connection,
3251 reply_handler_timeout (void *data)
3253 DBusConnection *connection;
3254 DBusDispatchStatus status;
3255 DBusPendingCall *pending = data;
3257 connection = _dbus_pending_call_get_connection_and_lock (pending);
3258 _dbus_connection_ref_unlocked (connection);
3260 _dbus_pending_call_queue_timeout_error_unlocked (pending,
3262 _dbus_connection_remove_timeout_unlocked (connection,
3263 _dbus_pending_call_get_timeout_unlocked (pending));
3264 _dbus_pending_call_set_timeout_added_unlocked (pending, FALSE);
3266 _dbus_verbose ("middle\n");
3267 status = _dbus_connection_get_dispatch_status_unlocked (connection);
3269 /* Unlocks, and calls out to user code */
3270 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
3271 dbus_connection_unref (connection);
3277 * Queues a message to send, as with dbus_connection_send(),
3278 * but also returns a #DBusPendingCall used to receive a reply to the
3279 * message. If no reply is received in the given timeout_milliseconds,
3280 * this function expires the pending reply and generates a synthetic
3281 * error reply (generated in-process, not by the remote application)
3282 * indicating that a timeout occurred.
3284 * A #DBusPendingCall will see a reply message before any filters or
3285 * registered object path handlers. See dbus_connection_dispatch() for
3286 * details on when handlers are run.
3288 * A #DBusPendingCall will always see exactly one reply message,
3289 * unless it's cancelled with dbus_pending_call_cancel().
3291 * If #NULL is passed for the pending_return, the #DBusPendingCall
3292 * will still be generated internally, and used to track
3293 * the message reply timeout. This means a timeout error will
3294 * occur if no reply arrives, unlike with dbus_connection_send().
3296 * If -1 is passed for the timeout, a sane default timeout is used. -1
3297 * is typically the best value for the timeout for this reason, unless
3298 * you want a very short or very long timeout. If #DBUS_TIMEOUT_INFINITE is
3299 * passed for the timeout, no timeout will be set and the call will block
3302 * @warning if the connection is disconnected or you try to send Unix
3303 * file descriptors on a connection that does not support them, the
3304 * #DBusPendingCall will be set to #NULL, so be careful with this.
3306 * @param connection the connection
3307 * @param message the message to send
3308 * @param pending_return return location for a #DBusPendingCall
3309 * object, or #NULL if connection is disconnected or when you try to
3310 * send Unix file descriptors on a connection that does not support
3312 * @param timeout_milliseconds timeout in milliseconds, -1 (or
3313 * #DBUS_TIMEOUT_USE_DEFAULT) for default or #DBUS_TIMEOUT_INFINITE for no
3315 * @returns #FALSE if no memory, #TRUE otherwise.
3319 dbus_connection_send_with_reply (DBusConnection *connection,
3320 DBusMessage *message,
3321 DBusPendingCall **pending_return,
3322 int timeout_milliseconds)
3324 DBusPendingCall *pending;
3325 dbus_int32_t serial = -1;
3326 DBusDispatchStatus status;
3328 _dbus_return_val_if_fail (connection != NULL, FALSE);
3329 _dbus_return_val_if_fail (message != NULL, FALSE);
3330 _dbus_return_val_if_fail (timeout_milliseconds >= 0 || timeout_milliseconds == -1, FALSE);
3333 *pending_return = NULL;
3335 CONNECTION_LOCK (connection);
3337 #ifdef HAVE_UNIX_FD_PASSING
3339 if (!_dbus_transport_can_pass_unix_fd(connection->transport) &&
3340 message->n_unix_fds > 0)
3342 /* Refuse to send fds on a connection that cannot handle
3343 them. Unfortunately we cannot return a proper error here, so
3344 the best we can do is return TRUE but leave *pending_return
3346 CONNECTION_UNLOCK (connection);
3352 if (!_dbus_connection_get_is_connected_unlocked (connection))
3354 CONNECTION_UNLOCK (connection);
3359 pending = _dbus_pending_call_new_unlocked (connection,
3360 timeout_milliseconds,
3361 reply_handler_timeout);
3363 if (pending == NULL)
3365 CONNECTION_UNLOCK (connection);
3369 /* Assign a serial to the message */
3370 serial = dbus_message_get_serial (message);
3373 serial = _dbus_connection_get_next_client_serial (connection);
3374 dbus_message_set_serial (message, serial);
3377 if (!_dbus_pending_call_set_timeout_error_unlocked (pending, message, serial))
3380 /* Insert the serial in the pending replies hash;
3381 * hash takes a refcount on DBusPendingCall.
3382 * Also, add the timeout.
3384 if (!_dbus_connection_attach_pending_call_unlocked (connection,
3388 if (!_dbus_connection_send_unlocked_no_update (connection, message, NULL))
3390 _dbus_connection_detach_pending_call_and_unlock (connection,
3392 goto error_unlocked;
3396 *pending_return = pending; /* hand off refcount */
3399 _dbus_connection_detach_pending_call_unlocked (connection, pending);
3400 /* we still have a ref to the pending call in this case, we unref
3401 * after unlocking, below
3405 status = _dbus_connection_get_dispatch_status_unlocked (connection);
3407 /* this calls out to user code */
3408 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
3410 if (pending_return == NULL)
3411 dbus_pending_call_unref (pending);
3416 CONNECTION_UNLOCK (connection);
3418 dbus_pending_call_unref (pending);
3423 * Sends a message and blocks a certain time period while waiting for
3424 * a reply. This function does not reenter the main loop,
3425 * i.e. messages other than the reply are queued up but not
3426 * processed. This function is used to invoke method calls on a
3429 * If a normal reply is received, it is returned, and removed from the
3430 * incoming message queue. If it is not received, #NULL is returned
3431 * and the error is set to #DBUS_ERROR_NO_REPLY. If an error reply is
3432 * received, it is converted to a #DBusError and returned as an error,
3433 * then the reply message is deleted and #NULL is returned. If
3434 * something else goes wrong, result is set to whatever is
3435 * appropriate, such as #DBUS_ERROR_NO_MEMORY or
3436 * #DBUS_ERROR_DISCONNECTED.
3438 * @warning While this function blocks the calling thread will not be
3439 * processing the incoming message queue. This means you can end up
3440 * deadlocked if the application you're talking to needs you to reply
3441 * to a method. To solve this, either avoid the situation, block in a
3442 * separate thread from the main connection-dispatching thread, or use
3443 * dbus_pending_call_set_notify() to avoid blocking.
3445 * @param connection the connection
3446 * @param message the message to send
3447 * @param timeout_milliseconds timeout in milliseconds, -1 (or
3448 * #DBUS_TIMEOUT_USE_DEFAULT) for default or #DBUS_TIMEOUT_INFINITE for no
3450 * @param error return location for error message
3451 * @returns the message that is the reply or #NULL with an error code if the
3455 dbus_connection_send_with_reply_and_block (DBusConnection *connection,
3456 DBusMessage *message,
3457 int timeout_milliseconds,
3461 DBusPendingCall *pending;
3463 _dbus_return_val_if_fail (connection != NULL, NULL);
3464 _dbus_return_val_if_fail (message != NULL, NULL);
3465 _dbus_return_val_if_fail (timeout_milliseconds >= 0 || timeout_milliseconds == -1, NULL);
3466 _dbus_return_val_if_error_is_set (error, NULL);
3468 #ifdef HAVE_UNIX_FD_PASSING
3470 CONNECTION_LOCK (connection);
3471 if (!_dbus_transport_can_pass_unix_fd(connection->transport) &&
3472 message->n_unix_fds > 0)
3474 CONNECTION_UNLOCK (connection);
3475 dbus_set_error(error, DBUS_ERROR_FAILED, "Cannot send file descriptors on this connection.");
3478 CONNECTION_UNLOCK (connection);
3482 if (!dbus_connection_send_with_reply (connection, message,
3483 &pending, timeout_milliseconds))
3485 _DBUS_SET_OOM (error);
3489 if (pending == NULL)
3491 dbus_set_error (error, DBUS_ERROR_DISCONNECTED, "Connection is closed");
3495 dbus_pending_call_block (pending);
3497 reply = dbus_pending_call_steal_reply (pending);
3498 dbus_pending_call_unref (pending);
3500 /* call_complete_and_unlock() called from pending_call_block() should
3501 * always fill this in.
3503 _dbus_assert (reply != NULL);
3505 if (dbus_set_error_from_message (error, reply))
3507 dbus_message_unref (reply);
3515 * Blocks until the outgoing message queue is empty.
3516 * Assumes connection lock already held.
3518 * If you call this, you MUST call update_dispatch_status afterword...
3520 * @param connection the connection.
3522 static DBusDispatchStatus
3523 _dbus_connection_flush_unlocked (DBusConnection *connection)
3525 /* We have to specify DBUS_ITERATION_DO_READING here because
3526 * otherwise we could have two apps deadlock if they are both doing
3527 * a flush(), and the kernel buffers fill up. This could change the
3530 DBusDispatchStatus status;
3532 HAVE_LOCK_CHECK (connection);
3534 while (connection->n_outgoing > 0 &&
3535 _dbus_connection_get_is_connected_unlocked (connection))
3537 _dbus_verbose ("doing iteration in\n");
3538 HAVE_LOCK_CHECK (connection);
3539 _dbus_connection_do_iteration_unlocked (connection,
3541 DBUS_ITERATION_DO_READING |
3542 DBUS_ITERATION_DO_WRITING |
3543 DBUS_ITERATION_BLOCK,
3547 HAVE_LOCK_CHECK (connection);
3548 _dbus_verbose ("middle\n");
3549 status = _dbus_connection_get_dispatch_status_unlocked (connection);
3551 HAVE_LOCK_CHECK (connection);
3556 * Blocks until the outgoing message queue is empty.
3558 * @param connection the connection.
3561 dbus_connection_flush (DBusConnection *connection)
3563 /* We have to specify DBUS_ITERATION_DO_READING here because
3564 * otherwise we could have two apps deadlock if they are both doing
3565 * a flush(), and the kernel buffers fill up. This could change the
3568 DBusDispatchStatus status;
3570 _dbus_return_if_fail (connection != NULL);
3572 CONNECTION_LOCK (connection);
3574 status = _dbus_connection_flush_unlocked (connection);
3576 HAVE_LOCK_CHECK (connection);
3577 /* Unlocks and calls out to user code */
3578 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
3580 _dbus_verbose ("end\n");
3584 * This function implements dbus_connection_read_write_dispatch() and
3585 * dbus_connection_read_write() (they pass a different value for the
3586 * dispatch parameter).
3588 * @param connection the connection
3589 * @param timeout_milliseconds max time to block or -1 for infinite
3590 * @param dispatch dispatch new messages or leave them on the incoming queue
3591 * @returns #TRUE if the disconnect message has not been processed
3594 _dbus_connection_read_write_dispatch (DBusConnection *connection,
3595 int timeout_milliseconds,
3596 dbus_bool_t dispatch)
3598 DBusDispatchStatus dstatus;
3599 dbus_bool_t progress_possible;
3601 /* Need to grab a ref here in case we're a private connection and
3602 * the user drops the last ref in a handler we call; see bug
3603 * https://bugs.freedesktop.org/show_bug.cgi?id=15635
3605 dbus_connection_ref (connection);
3606 dstatus = dbus_connection_get_dispatch_status (connection);
3608 if (dispatch && dstatus == DBUS_DISPATCH_DATA_REMAINS)
3610 _dbus_verbose ("doing dispatch\n");
3611 dbus_connection_dispatch (connection);
3612 CONNECTION_LOCK (connection);
3614 else if (dstatus == DBUS_DISPATCH_NEED_MEMORY)
3616 _dbus_verbose ("pausing for memory\n");
3617 _dbus_memory_pause_based_on_timeout (timeout_milliseconds);
3618 CONNECTION_LOCK (connection);
3622 CONNECTION_LOCK (connection);
3623 if (_dbus_connection_get_is_connected_unlocked (connection))
3625 _dbus_verbose ("doing iteration\n");
3626 _dbus_connection_do_iteration_unlocked (connection,
3628 DBUS_ITERATION_DO_READING |
3629 DBUS_ITERATION_DO_WRITING |
3630 DBUS_ITERATION_BLOCK,
3631 timeout_milliseconds);
3635 HAVE_LOCK_CHECK (connection);
3636 /* If we can dispatch, we can make progress until the Disconnected message
3637 * has been processed; if we can only read/write, we can make progress
3638 * as long as the transport is open.
3641 progress_possible = connection->n_incoming != 0 ||
3642 connection->disconnect_message_link != NULL;
3644 progress_possible = _dbus_connection_get_is_connected_unlocked (connection);
3646 CONNECTION_UNLOCK (connection);
3648 dbus_connection_unref (connection);
3650 return progress_possible; /* TRUE if we can make more progress */
3655 * This function is intended for use with applications that don't want
3656 * to write a main loop and deal with #DBusWatch and #DBusTimeout. An
3657 * example usage would be:
3660 * while (dbus_connection_read_write_dispatch (connection, -1))
3661 * ; // empty loop body
3664 * In this usage you would normally have set up a filter function to look
3665 * at each message as it is dispatched. The loop terminates when the last
3666 * message from the connection (the disconnected signal) is processed.
3668 * If there are messages to dispatch, this function will
3669 * dbus_connection_dispatch() once, and return. If there are no
3670 * messages to dispatch, this function will block until it can read or
3671 * write, then read or write, then return.
3673 * The way to think of this function is that it either makes some sort
3674 * of progress, or it blocks. Note that, while it is blocked on I/O, it
3675 * cannot be interrupted (even by other threads), which makes this function
3676 * unsuitable for applications that do more than just react to received
3679 * The return value indicates whether the disconnect message has been
3680 * processed, NOT whether the connection is connected. This is
3681 * important because even after disconnecting, you want to process any
3682 * messages you received prior to the disconnect.
3684 * @param connection the connection
3685 * @param timeout_milliseconds max time to block or -1 for infinite
3686 * @returns #TRUE if the disconnect message has not been processed
3689 dbus_connection_read_write_dispatch (DBusConnection *connection,
3690 int timeout_milliseconds)
3692 _dbus_return_val_if_fail (connection != NULL, FALSE);
3693 _dbus_return_val_if_fail (timeout_milliseconds >= 0 || timeout_milliseconds == -1, FALSE);
3694 return _dbus_connection_read_write_dispatch(connection, timeout_milliseconds, TRUE);
3698 * This function is intended for use with applications that don't want to
3699 * write a main loop and deal with #DBusWatch and #DBusTimeout. See also
3700 * dbus_connection_read_write_dispatch().
3702 * As long as the connection is open, this function will block until it can
3703 * read or write, then read or write, then return #TRUE.
3705 * If the connection is closed, the function returns #FALSE.
3707 * The return value indicates whether reading or writing is still
3708 * possible, i.e. whether the connection is connected.
3710 * Note that even after disconnection, messages may remain in the
3711 * incoming queue that need to be
3712 * processed. dbus_connection_read_write_dispatch() dispatches
3713 * incoming messages for you; with dbus_connection_read_write() you
3714 * have to arrange to drain the incoming queue yourself.
3716 * @param connection the connection
3717 * @param timeout_milliseconds max time to block or -1 for infinite
3718 * @returns #TRUE if still connected
3721 dbus_connection_read_write (DBusConnection *connection,
3722 int timeout_milliseconds)
3724 _dbus_return_val_if_fail (connection != NULL, FALSE);
3725 _dbus_return_val_if_fail (timeout_milliseconds >= 0 || timeout_milliseconds == -1, FALSE);
3726 return _dbus_connection_read_write_dispatch(connection, timeout_milliseconds, FALSE);
3729 /* We need to call this anytime we pop the head of the queue, and then
3730 * update_dispatch_status_and_unlock needs to be called afterward
3731 * which will "process" the disconnected message and set
3732 * disconnected_message_processed.
3735 check_disconnected_message_arrived_unlocked (DBusConnection *connection,
3736 DBusMessage *head_of_queue)
3738 HAVE_LOCK_CHECK (connection);
3740 /* checking that the link is NULL is an optimization to avoid the is_signal call */
3741 if (connection->disconnect_message_link == NULL &&
3742 dbus_message_is_signal (head_of_queue,
3743 DBUS_INTERFACE_LOCAL,
3746 connection->disconnected_message_arrived = TRUE;
3751 * Returns the first-received message from the incoming message queue,
3752 * leaving it in the queue. If the queue is empty, returns #NULL.
3754 * The caller does not own a reference to the returned message, and
3755 * must either return it using dbus_connection_return_message() or
3756 * keep it after calling dbus_connection_steal_borrowed_message(). No
3757 * one can get at the message while its borrowed, so return it as
3758 * quickly as possible and don't keep a reference to it after
3759 * returning it. If you need to keep the message, make a copy of it.
3761 * dbus_connection_dispatch() will block if called while a borrowed
3762 * message is outstanding; only one piece of code can be playing with
3763 * the incoming queue at a time. This function will block if called
3764 * during a dbus_connection_dispatch().
3766 * @param connection the connection.
3767 * @returns next message in the incoming queue.
3770 dbus_connection_borrow_message (DBusConnection *connection)
3772 DBusDispatchStatus status;
3773 DBusMessage *message;
3775 _dbus_return_val_if_fail (connection != NULL, NULL);
3777 _dbus_verbose ("start\n");
3779 /* this is called for the side effect that it queues
3780 * up any messages from the transport
3782 status = dbus_connection_get_dispatch_status (connection);
3783 if (status != DBUS_DISPATCH_DATA_REMAINS)
3786 CONNECTION_LOCK (connection);
3788 _dbus_connection_acquire_dispatch (connection);
3790 /* While a message is outstanding, the dispatch lock is held */
3791 _dbus_assert (connection->message_borrowed == NULL);
3793 connection->message_borrowed = _dbus_list_get_first (&connection->incoming_messages);
3795 message = connection->message_borrowed;
3797 check_disconnected_message_arrived_unlocked (connection, message);
3799 /* Note that we KEEP the dispatch lock until the message is returned */
3800 if (message == NULL)
3801 _dbus_connection_release_dispatch (connection);
3803 CONNECTION_UNLOCK (connection);
3805 _dbus_message_trace_ref (message, -1, -1, "dbus_connection_borrow_message");
3807 /* We don't update dispatch status until it's returned or stolen */
3813 * Used to return a message after peeking at it using
3814 * dbus_connection_borrow_message(). Only called if
3815 * message from dbus_connection_borrow_message() was non-#NULL.
3817 * @param connection the connection
3818 * @param message the message from dbus_connection_borrow_message()
3821 dbus_connection_return_message (DBusConnection *connection,
3822 DBusMessage *message)
3824 DBusDispatchStatus status;
3826 _dbus_return_if_fail (connection != NULL);
3827 _dbus_return_if_fail (message != NULL);
3828 _dbus_return_if_fail (message == connection->message_borrowed);
3829 _dbus_return_if_fail (connection->dispatch_acquired);
3831 CONNECTION_LOCK (connection);
3833 _dbus_assert (message == connection->message_borrowed);
3835 connection->message_borrowed = NULL;
3837 _dbus_connection_release_dispatch (connection);
3839 status = _dbus_connection_get_dispatch_status_unlocked (connection);
3840 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
3842 _dbus_message_trace_ref (message, -1, -1, "dbus_connection_return_message");
3846 * Used to keep a message after peeking at it using
3847 * dbus_connection_borrow_message(). Before using this function, see
3848 * the caveats/warnings in the documentation for
3849 * dbus_connection_pop_message().
3851 * @param connection the connection
3852 * @param message the message from dbus_connection_borrow_message()
3855 dbus_connection_steal_borrowed_message (DBusConnection *connection,
3856 DBusMessage *message)
3858 DBusMessage *pop_message;
3859 DBusDispatchStatus status;
3861 _dbus_return_if_fail (connection != NULL);
3862 _dbus_return_if_fail (message != NULL);
3863 _dbus_return_if_fail (message == connection->message_borrowed);
3864 _dbus_return_if_fail (connection->dispatch_acquired);
3866 CONNECTION_LOCK (connection);
3868 _dbus_assert (message == connection->message_borrowed);
3870 pop_message = _dbus_list_pop_first (&connection->incoming_messages);
3871 _dbus_assert (message == pop_message);
3872 (void) pop_message; /* unused unless asserting */
3874 connection->n_incoming -= 1;
3876 _dbus_verbose ("Incoming message %p stolen from queue, %d incoming\n",
3877 message, connection->n_incoming);
3879 connection->message_borrowed = NULL;
3881 _dbus_connection_release_dispatch (connection);
3883 status = _dbus_connection_get_dispatch_status_unlocked (connection);
3884 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
3885 _dbus_message_trace_ref (message, -1, -1,
3886 "dbus_connection_steal_borrowed_message");
3889 /* See dbus_connection_pop_message, but requires the caller to own
3890 * the lock before calling. May drop the lock while running.
3893 _dbus_connection_pop_message_link_unlocked (DBusConnection *connection)
3895 HAVE_LOCK_CHECK (connection);
3897 _dbus_assert (connection->message_borrowed == NULL);
3899 if (connection->n_incoming > 0)
3903 link = _dbus_list_pop_first_link (&connection->incoming_messages);
3904 connection->n_incoming -= 1;
3906 _dbus_verbose ("Message %p (%s %s %s %s '%s') removed from incoming queue %p, %d incoming\n",
3908 dbus_message_type_to_string (dbus_message_get_type (link->data)),
3909 dbus_message_get_path (link->data) ?
3910 dbus_message_get_path (link->data) :
3912 dbus_message_get_interface (link->data) ?
3913 dbus_message_get_interface (link->data) :
3915 dbus_message_get_member (link->data) ?
3916 dbus_message_get_member (link->data) :
3918 dbus_message_get_signature (link->data),
3919 connection, connection->n_incoming);
3921 _dbus_message_trace_ref (link->data, -1, -1,
3922 "_dbus_connection_pop_message_link_unlocked");
3924 check_disconnected_message_arrived_unlocked (connection, link->data);
3932 /* See dbus_connection_pop_message, but requires the caller to own
3933 * the lock before calling. May drop the lock while running.
3936 _dbus_connection_pop_message_unlocked (DBusConnection *connection)
3940 HAVE_LOCK_CHECK (connection);
3942 link = _dbus_connection_pop_message_link_unlocked (connection);
3946 DBusMessage *message;
3948 message = link->data;
3950 _dbus_list_free_link (link);
3959 _dbus_connection_putback_message_link_unlocked (DBusConnection *connection,
3960 DBusList *message_link)
3962 HAVE_LOCK_CHECK (connection);
3964 _dbus_assert (message_link != NULL);
3965 /* You can't borrow a message while a link is outstanding */
3966 _dbus_assert (connection->message_borrowed == NULL);
3967 /* We had to have the dispatch lock across the pop/putback */
3968 _dbus_assert (connection->dispatch_acquired);
3970 _dbus_list_prepend_link (&connection->incoming_messages,
3972 connection->n_incoming += 1;
3974 _dbus_verbose ("Message %p (%s %s %s '%s') put back into queue %p, %d incoming\n",
3976 dbus_message_type_to_string (dbus_message_get_type (message_link->data)),
3977 dbus_message_get_interface (message_link->data) ?
3978 dbus_message_get_interface (message_link->data) :
3980 dbus_message_get_member (message_link->data) ?
3981 dbus_message_get_member (message_link->data) :
3983 dbus_message_get_signature (message_link->data),
3984 connection, connection->n_incoming);
3986 _dbus_message_trace_ref (message_link->data, -1, -1,
3987 "_dbus_connection_putback_message_link_unlocked");
3991 * Returns the first-received message from the incoming message queue,
3992 * removing it from the queue. The caller owns a reference to the
3993 * returned message. If the queue is empty, returns #NULL.
3995 * This function bypasses any message handlers that are registered,
3996 * and so using it is usually wrong. Instead, let the main loop invoke
3997 * dbus_connection_dispatch(). Popping messages manually is only
3998 * useful in very simple programs that don't share a #DBusConnection
3999 * with any libraries or other modules.
4001 * There is a lock that covers all ways of accessing the incoming message
4002 * queue, so dbus_connection_dispatch(), dbus_connection_pop_message(),
4003 * dbus_connection_borrow_message(), etc. will all block while one of the others
4004 * in the group is running.
4006 * @param connection the connection.
4007 * @returns next message in the incoming queue.
4010 dbus_connection_pop_message (DBusConnection *connection)
4012 DBusMessage *message;
4013 DBusDispatchStatus status;
4015 _dbus_verbose ("start\n");
4017 /* this is called for the side effect that it queues
4018 * up any messages from the transport
4020 status = dbus_connection_get_dispatch_status (connection);
4021 if (status != DBUS_DISPATCH_DATA_REMAINS)
4024 CONNECTION_LOCK (connection);
4025 _dbus_connection_acquire_dispatch (connection);
4026 HAVE_LOCK_CHECK (connection);
4028 message = _dbus_connection_pop_message_unlocked (connection);
4030 _dbus_verbose ("Returning popped message %p\n", message);
4032 _dbus_connection_release_dispatch (connection);
4034 status = _dbus_connection_get_dispatch_status_unlocked (connection);
4035 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
4041 * Acquire the dispatcher. This is a separate lock so the main
4042 * connection lock can be dropped to call out to application dispatch
4045 * @param connection the connection.
4048 _dbus_connection_acquire_dispatch (DBusConnection *connection)
4050 HAVE_LOCK_CHECK (connection);
4052 _dbus_connection_ref_unlocked (connection);
4053 CONNECTION_UNLOCK (connection);
4055 _dbus_verbose ("locking dispatch_mutex\n");
4056 _dbus_mutex_lock (connection->dispatch_mutex);
4058 while (connection->dispatch_acquired)
4060 _dbus_verbose ("waiting for dispatch to be acquirable\n");
4061 _dbus_condvar_wait (connection->dispatch_cond,
4062 connection->dispatch_mutex);
4065 _dbus_assert (!connection->dispatch_acquired);
4067 connection->dispatch_acquired = TRUE;
4069 _dbus_verbose ("unlocking dispatch_mutex\n");
4070 _dbus_mutex_unlock (connection->dispatch_mutex);
4072 CONNECTION_LOCK (connection);
4073 _dbus_connection_unref_unlocked (connection);
4077 * Release the dispatcher when you're done with it. Only call
4078 * after you've acquired the dispatcher. Wakes up at most one
4079 * thread currently waiting to acquire the dispatcher.
4081 * @param connection the connection.
4084 _dbus_connection_release_dispatch (DBusConnection *connection)
4086 HAVE_LOCK_CHECK (connection);
4088 _dbus_verbose ("locking dispatch_mutex\n");
4089 _dbus_mutex_lock (connection->dispatch_mutex);
4091 _dbus_assert (connection->dispatch_acquired);
4093 connection->dispatch_acquired = FALSE;
4094 _dbus_condvar_wake_one (connection->dispatch_cond);
4096 _dbus_verbose ("unlocking dispatch_mutex\n");
4097 _dbus_mutex_unlock (connection->dispatch_mutex);
4101 _dbus_connection_failed_pop (DBusConnection *connection,
4102 DBusList *message_link)
4104 _dbus_list_prepend_link (&connection->incoming_messages,
4106 connection->n_incoming += 1;
4109 /* Note this may be called multiple times since we don't track whether we already did it */
4111 notify_disconnected_unlocked (DBusConnection *connection)
4113 HAVE_LOCK_CHECK (connection);
4115 /* Set the weakref in dbus-bus.c to NULL, so nobody will get a disconnected
4116 * connection from dbus_bus_get(). We make the same guarantee for
4117 * dbus_connection_open() but in a different way since we don't want to
4118 * unref right here; we instead check for connectedness before returning
4119 * the connection from the hash.
4121 _dbus_bus_notify_shared_connection_disconnected_unlocked (connection);
4123 /* Dump the outgoing queue, we aren't going to be able to
4124 * send it now, and we'd like accessors like
4125 * dbus_connection_get_outgoing_size() to be accurate.
4127 if (connection->n_outgoing > 0)
4131 _dbus_verbose ("Dropping %d outgoing messages since we're disconnected\n",
4132 connection->n_outgoing);
4134 while ((link = _dbus_list_get_last_link (&connection->outgoing_messages)))
4136 _dbus_connection_message_sent_unlocked (connection, link->data);
4141 /* Note this may be called multiple times since we don't track whether we already did it */
4142 static DBusDispatchStatus
4143 notify_disconnected_and_dispatch_complete_unlocked (DBusConnection *connection)
4145 HAVE_LOCK_CHECK (connection);
4147 if (connection->disconnect_message_link != NULL)
4149 _dbus_verbose ("Sending disconnect message\n");
4151 /* If we have pending calls, queue their timeouts - we want the Disconnected
4152 * to be the last message, after these timeouts.
4154 connection_timeout_and_complete_all_pending_calls_unlocked (connection);
4156 /* We haven't sent the disconnect message already,
4157 * and all real messages have been queued up.
4159 _dbus_connection_queue_synthesized_message_link (connection,
4160 connection->disconnect_message_link);
4161 connection->disconnect_message_link = NULL;
4163 return DBUS_DISPATCH_DATA_REMAINS;
4166 return DBUS_DISPATCH_COMPLETE;
4169 static DBusDispatchStatus
4170 _dbus_connection_get_dispatch_status_unlocked (DBusConnection *connection)
4172 HAVE_LOCK_CHECK (connection);
4174 if (connection->n_incoming > 0)
4175 return DBUS_DISPATCH_DATA_REMAINS;
4176 else if (!_dbus_transport_queue_messages (connection->transport))
4177 return DBUS_DISPATCH_NEED_MEMORY;
4180 DBusDispatchStatus status;
4181 dbus_bool_t is_connected;
4183 status = _dbus_transport_get_dispatch_status (connection->transport);
4184 is_connected = _dbus_transport_get_is_connected (connection->transport);
4186 _dbus_verbose ("dispatch status = %s is_connected = %d\n",
4187 DISPATCH_STATUS_NAME (status), is_connected);
4191 /* It's possible this would be better done by having an explicit
4192 * notification from _dbus_transport_disconnect() that would
4193 * synchronously do this, instead of waiting for the next dispatch
4194 * status check. However, probably not good to change until it causes
4197 notify_disconnected_unlocked (connection);
4199 /* I'm not sure this is needed; the idea is that we want to
4200 * queue the Disconnected only after we've read all the
4201 * messages, but if we're disconnected maybe we are guaranteed
4202 * to have read them all ?
4204 if (status == DBUS_DISPATCH_COMPLETE)
4205 status = notify_disconnected_and_dispatch_complete_unlocked (connection);
4208 if (status != DBUS_DISPATCH_COMPLETE)
4210 else if (connection->n_incoming > 0)
4211 return DBUS_DISPATCH_DATA_REMAINS;
4213 return DBUS_DISPATCH_COMPLETE;
4218 _dbus_connection_update_dispatch_status_and_unlock (DBusConnection *connection,
4219 DBusDispatchStatus new_status)
4221 dbus_bool_t changed;
4222 DBusDispatchStatusFunction function;
4225 HAVE_LOCK_CHECK (connection);
4227 _dbus_connection_ref_unlocked (connection);
4229 changed = new_status != connection->last_dispatch_status;
4231 connection->last_dispatch_status = new_status;
4233 function = connection->dispatch_status_function;
4234 data = connection->dispatch_status_data;
4236 if (connection->disconnected_message_arrived &&
4237 !connection->disconnected_message_processed)
4239 connection->disconnected_message_processed = TRUE;
4241 /* this does an unref, but we have a ref
4242 * so we should not run the finalizer here
4245 connection_forget_shared_unlocked (connection);
4247 if (connection->exit_on_disconnect)
4249 CONNECTION_UNLOCK (connection);
4251 _dbus_verbose ("Exiting on Disconnected signal\n");
4253 _dbus_assert_not_reached ("Call to exit() returned");
4257 /* We drop the lock */
4258 CONNECTION_UNLOCK (connection);
4260 if (changed && function)
4262 _dbus_verbose ("Notifying of change to dispatch status of %p now %d (%s)\n",
4263 connection, new_status,
4264 DISPATCH_STATUS_NAME (new_status));
4265 (* function) (connection, new_status, data);
4268 dbus_connection_unref (connection);
4272 * Gets the current state of the incoming message queue.
4273 * #DBUS_DISPATCH_DATA_REMAINS indicates that the message queue
4274 * may contain messages. #DBUS_DISPATCH_COMPLETE indicates that the
4275 * incoming queue is empty. #DBUS_DISPATCH_NEED_MEMORY indicates that
4276 * there could be data, but we can't know for sure without more
4279 * To process the incoming message queue, use dbus_connection_dispatch()
4280 * or (in rare cases) dbus_connection_pop_message().
4282 * Note, #DBUS_DISPATCH_DATA_REMAINS really means that either we
4283 * have messages in the queue, or we have raw bytes buffered up
4284 * that need to be parsed. When these bytes are parsed, they
4285 * may not add up to an entire message. Thus, it's possible
4286 * to see a status of #DBUS_DISPATCH_DATA_REMAINS but not
4287 * have a message yet.
4289 * In particular this happens on initial connection, because all sorts
4290 * of authentication protocol stuff has to be parsed before the
4291 * first message arrives.
4293 * @param connection the connection.
4294 * @returns current dispatch status
4297 dbus_connection_get_dispatch_status (DBusConnection *connection)
4299 DBusDispatchStatus status;
4301 _dbus_return_val_if_fail (connection != NULL, DBUS_DISPATCH_COMPLETE);
4303 _dbus_verbose ("start\n");
4305 CONNECTION_LOCK (connection);
4307 status = _dbus_connection_get_dispatch_status_unlocked (connection);
4309 CONNECTION_UNLOCK (connection);
4315 * Filter funtion for handling the Peer standard interface.
4317 static DBusHandlerResult
4318 _dbus_connection_peer_filter_unlocked_no_update (DBusConnection *connection,
4319 DBusMessage *message)
4321 dbus_bool_t sent = FALSE;
4322 DBusMessage *ret = NULL;
4323 DBusList *expire_link;
4325 if (connection->route_peer_messages && dbus_message_get_destination (message) != NULL)
4327 /* This means we're letting the bus route this message */
4328 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
4331 if (!dbus_message_has_interface (message, DBUS_INTERFACE_PEER))
4333 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
4336 /* Preallocate a linked-list link, so that if we need to dispose of a
4337 * message, we can attach it to the expired list */
4338 expire_link = _dbus_list_alloc_link (NULL);
4341 return DBUS_HANDLER_RESULT_NEED_MEMORY;
4343 if (dbus_message_is_method_call (message,
4344 DBUS_INTERFACE_PEER,
4347 ret = dbus_message_new_method_return (message);
4351 sent = _dbus_connection_send_unlocked_no_update (connection, ret, NULL);
4353 else if (dbus_message_is_method_call (message,
4354 DBUS_INTERFACE_PEER,
4359 ret = dbus_message_new_method_return (message);
4363 _dbus_string_init (&uuid);
4364 if (_dbus_get_local_machine_uuid_encoded (&uuid))
4366 const char *v_STRING = _dbus_string_get_const_data (&uuid);
4367 if (dbus_message_append_args (ret,
4368 DBUS_TYPE_STRING, &v_STRING,
4371 sent = _dbus_connection_send_unlocked_no_update (connection, ret, NULL);
4374 _dbus_string_free (&uuid);
4378 /* We need to bounce anything else with this interface, otherwise apps
4379 * could start extending the interface and when we added extensions
4380 * here to DBusConnection we'd break those apps.
4382 ret = dbus_message_new_error (message,
4383 DBUS_ERROR_UNKNOWN_METHOD,
4384 "Unknown method invoked on org.freedesktop.DBus.Peer interface");
4388 sent = _dbus_connection_send_unlocked_no_update (connection, ret, NULL);
4394 _dbus_list_free_link (expire_link);
4398 /* It'll be safe to unref the reply when we unlock */
4399 expire_link->data = ret;
4400 _dbus_list_prepend_link (&connection->expired_messages, expire_link);
4404 return DBUS_HANDLER_RESULT_NEED_MEMORY;
4406 return DBUS_HANDLER_RESULT_HANDLED;
4410 * Processes all builtin filter functions
4412 * If the spec specifies a standard interface
4413 * they should be processed from this method
4415 static DBusHandlerResult
4416 _dbus_connection_run_builtin_filters_unlocked_no_update (DBusConnection *connection,
4417 DBusMessage *message)
4419 /* We just run one filter for now but have the option to run more
4420 if the spec calls for it in the future */
4422 return _dbus_connection_peer_filter_unlocked_no_update (connection, message);
4426 * Processes any incoming data.
4428 * If there's incoming raw data that has not yet been parsed, it is
4429 * parsed, which may or may not result in adding messages to the
4432 * The incoming data buffer is filled when the connection reads from
4433 * its underlying transport (such as a socket). Reading usually
4434 * happens in dbus_watch_handle() or dbus_connection_read_write().
4436 * If there are complete messages in the incoming queue,
4437 * dbus_connection_dispatch() removes one message from the queue and
4438 * processes it. Processing has three steps.
4440 * First, any method replies are passed to #DBusPendingCall or
4441 * dbus_connection_send_with_reply_and_block() in order to
4442 * complete the pending method call.
4444 * Second, any filters registered with dbus_connection_add_filter()
4445 * are run. If any filter returns #DBUS_HANDLER_RESULT_HANDLED
4446 * then processing stops after that filter.
4448 * Third, if the message is a method call it is forwarded to
4449 * any registered object path handlers added with
4450 * dbus_connection_register_object_path() or
4451 * dbus_connection_register_fallback().
4453 * A single call to dbus_connection_dispatch() will process at most
4454 * one message; it will not clear the entire message queue.
4456 * Be careful about calling dbus_connection_dispatch() from inside a
4457 * message handler, i.e. calling dbus_connection_dispatch()
4458 * recursively. If threads have been initialized with a recursive
4459 * mutex function, then this will not deadlock; however, it can
4460 * certainly confuse your application.
4462 * @todo some FIXME in here about handling DBUS_HANDLER_RESULT_NEED_MEMORY
4464 * @param connection the connection
4465 * @returns dispatch status, see dbus_connection_get_dispatch_status()
4468 dbus_connection_dispatch (DBusConnection *connection)
4470 DBusMessage *message;
4471 DBusList *link, *filter_list_copy, *message_link;
4472 DBusHandlerResult result;
4473 DBusPendingCall *pending;
4474 dbus_int32_t reply_serial;
4475 DBusDispatchStatus status;
4476 dbus_bool_t found_object;
4478 _dbus_return_val_if_fail (connection != NULL, DBUS_DISPATCH_COMPLETE);
4480 _dbus_verbose ("\n");
4482 CONNECTION_LOCK (connection);
4483 status = _dbus_connection_get_dispatch_status_unlocked (connection);
4484 if (status != DBUS_DISPATCH_DATA_REMAINS)
4486 /* unlocks and calls out to user code */
4487 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
4491 /* We need to ref the connection since the callback could potentially
4492 * drop the last ref to it
4494 _dbus_connection_ref_unlocked (connection);
4496 _dbus_connection_acquire_dispatch (connection);
4497 HAVE_LOCK_CHECK (connection);
4499 message_link = _dbus_connection_pop_message_link_unlocked (connection);
4500 if (message_link == NULL)
4502 /* another thread dispatched our stuff */
4504 _dbus_verbose ("another thread dispatched message (during acquire_dispatch above)\n");
4506 _dbus_connection_release_dispatch (connection);
4508 status = _dbus_connection_get_dispatch_status_unlocked (connection);
4510 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
4512 dbus_connection_unref (connection);
4517 message = message_link->data;
4519 _dbus_verbose (" dispatching message %p (%s %s %s '%s')\n",
4521 dbus_message_type_to_string (dbus_message_get_type (message)),
4522 dbus_message_get_interface (message) ?
4523 dbus_message_get_interface (message) :
4525 dbus_message_get_member (message) ?
4526 dbus_message_get_member (message) :
4528 dbus_message_get_signature (message));
4530 result = DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
4532 /* Pending call handling must be first, because if you do
4533 * dbus_connection_send_with_reply_and_block() or
4534 * dbus_pending_call_block() then no handlers/filters will be run on
4535 * the reply. We want consistent semantics in the case where we
4536 * dbus_connection_dispatch() the reply.
4539 reply_serial = dbus_message_get_reply_serial (message);
4540 pending = _dbus_hash_table_lookup_int (connection->pending_replies,
4544 _dbus_verbose ("Dispatching a pending reply\n");
4545 complete_pending_call_and_unlock (connection, pending, message);
4546 pending = NULL; /* it's probably unref'd */
4548 CONNECTION_LOCK (connection);
4549 _dbus_verbose ("pending call completed in dispatch\n");
4550 result = DBUS_HANDLER_RESULT_HANDLED;
4554 result = _dbus_connection_run_builtin_filters_unlocked_no_update (connection, message);
4555 if (result != DBUS_HANDLER_RESULT_NOT_YET_HANDLED)
4558 if (!_dbus_list_copy (&connection->filter_list, &filter_list_copy))
4560 _dbus_connection_release_dispatch (connection);
4561 HAVE_LOCK_CHECK (connection);
4563 _dbus_connection_failed_pop (connection, message_link);
4565 /* unlocks and calls user code */
4566 _dbus_connection_update_dispatch_status_and_unlock (connection,
4567 DBUS_DISPATCH_NEED_MEMORY);
4568 dbus_connection_unref (connection);
4570 return DBUS_DISPATCH_NEED_MEMORY;
4573 _dbus_list_foreach (&filter_list_copy,
4574 (DBusForeachFunction)_dbus_message_filter_ref,
4577 /* We're still protected from dispatch() reentrancy here
4578 * since we acquired the dispatcher
4580 CONNECTION_UNLOCK (connection);
4582 link = _dbus_list_get_first_link (&filter_list_copy);
4583 while (link != NULL)
4585 DBusMessageFilter *filter = link->data;
4586 DBusList *next = _dbus_list_get_next_link (&filter_list_copy, link);
4588 if (filter->function == NULL)
4590 _dbus_verbose (" filter was removed in a callback function\n");
4595 _dbus_verbose (" running filter on message %p\n", message);
4596 result = (* filter->function) (connection, message, filter->user_data);
4598 if (result != DBUS_HANDLER_RESULT_NOT_YET_HANDLED)
4604 _dbus_list_foreach (&filter_list_copy,
4605 (DBusForeachFunction)_dbus_message_filter_unref,
4607 _dbus_list_clear (&filter_list_copy);
4609 CONNECTION_LOCK (connection);
4611 if (result == DBUS_HANDLER_RESULT_NEED_MEMORY)
4613 _dbus_verbose ("No memory\n");
4616 else if (result == DBUS_HANDLER_RESULT_HANDLED)
4618 _dbus_verbose ("filter handled message in dispatch\n");
4622 /* We're still protected from dispatch() reentrancy here
4623 * since we acquired the dispatcher
4625 _dbus_verbose (" running object path dispatch on message %p (%s %s %s '%s')\n",
4627 dbus_message_type_to_string (dbus_message_get_type (message)),
4628 dbus_message_get_interface (message) ?
4629 dbus_message_get_interface (message) :
4631 dbus_message_get_member (message) ?
4632 dbus_message_get_member (message) :
4634 dbus_message_get_signature (message));
4636 HAVE_LOCK_CHECK (connection);
4637 result = _dbus_object_tree_dispatch_and_unlock (connection->objects,
4641 CONNECTION_LOCK (connection);
4643 if (result != DBUS_HANDLER_RESULT_NOT_YET_HANDLED)
4645 _dbus_verbose ("object tree handled message in dispatch\n");
4649 if (dbus_message_get_type (message) == DBUS_MESSAGE_TYPE_METHOD_CALL)
4653 DBusPreallocatedSend *preallocated;
4654 DBusList *expire_link;
4656 _dbus_verbose (" sending error %s\n",
4657 DBUS_ERROR_UNKNOWN_METHOD);
4659 if (!_dbus_string_init (&str))
4661 result = DBUS_HANDLER_RESULT_NEED_MEMORY;
4662 _dbus_verbose ("no memory for error string in dispatch\n");
4666 if (!_dbus_string_append_printf (&str,
4667 "Method \"%s\" with signature \"%s\" on interface \"%s\" doesn't exist\n",
4668 dbus_message_get_member (message),
4669 dbus_message_get_signature (message),
4670 dbus_message_get_interface (message)))
4672 _dbus_string_free (&str);
4673 result = DBUS_HANDLER_RESULT_NEED_MEMORY;
4674 _dbus_verbose ("no memory for error string in dispatch\n");
4678 reply = dbus_message_new_error (message,
4679 found_object ? DBUS_ERROR_UNKNOWN_METHOD : DBUS_ERROR_UNKNOWN_OBJECT,
4680 _dbus_string_get_const_data (&str));
4681 _dbus_string_free (&str);
4685 result = DBUS_HANDLER_RESULT_NEED_MEMORY;
4686 _dbus_verbose ("no memory for error reply in dispatch\n");
4690 expire_link = _dbus_list_alloc_link (reply);
4692 if (expire_link == NULL)
4694 dbus_message_unref (reply);
4695 result = DBUS_HANDLER_RESULT_NEED_MEMORY;
4696 _dbus_verbose ("no memory for error send in dispatch\n");
4700 preallocated = _dbus_connection_preallocate_send_unlocked (connection);
4702 if (preallocated == NULL)
4704 _dbus_list_free_link (expire_link);
4705 /* It's OK that this is finalized, because it hasn't been seen by
4706 * anything that could attach user callbacks */
4707 dbus_message_unref (reply);
4708 result = DBUS_HANDLER_RESULT_NEED_MEMORY;
4709 _dbus_verbose ("no memory for error send in dispatch\n");
4713 _dbus_connection_send_preallocated_unlocked_no_update (connection, preallocated,
4715 /* reply will be freed when we release the lock */
4716 _dbus_list_prepend_link (&connection->expired_messages, expire_link);
4718 result = DBUS_HANDLER_RESULT_HANDLED;
4721 _dbus_verbose (" done dispatching %p (%s %s %s '%s') on connection %p\n", message,
4722 dbus_message_type_to_string (dbus_message_get_type (message)),
4723 dbus_message_get_interface (message) ?
4724 dbus_message_get_interface (message) :
4726 dbus_message_get_member (message) ?
4727 dbus_message_get_member (message) :
4729 dbus_message_get_signature (message),
4733 if (result == DBUS_HANDLER_RESULT_NEED_MEMORY)
4735 _dbus_verbose ("out of memory\n");
4737 /* Put message back, and we'll start over.
4738 * Yes this means handlers must be idempotent if they
4739 * don't return HANDLED; c'est la vie.
4741 _dbus_connection_putback_message_link_unlocked (connection,
4743 /* now we don't want to free them */
4744 message_link = NULL;
4749 _dbus_verbose (" ... done dispatching\n");
4752 _dbus_connection_release_dispatch (connection);
4753 HAVE_LOCK_CHECK (connection);
4755 if (message != NULL)
4757 /* We don't want this message to count in maximum message limits when
4758 * computing the dispatch status, below. We have to drop the lock
4759 * temporarily, because finalizing a message can trigger callbacks.
4761 * We have a reference to the connection, and we don't use any cached
4762 * pointers to the connection's internals below this point, so it should
4763 * be safe to drop the lock and take it back. */
4764 CONNECTION_UNLOCK (connection);
4765 dbus_message_unref (message);
4766 CONNECTION_LOCK (connection);
4769 if (message_link != NULL)
4770 _dbus_list_free_link (message_link);
4772 _dbus_verbose ("before final status update\n");
4773 status = _dbus_connection_get_dispatch_status_unlocked (connection);
4775 /* unlocks and calls user code */
4776 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
4778 dbus_connection_unref (connection);
4784 * Sets the watch functions for the connection. These functions are
4785 * responsible for making the application's main loop aware of file
4786 * descriptors that need to be monitored for events, using select() or
4787 * poll(). When using Qt, typically the DBusAddWatchFunction would
4788 * create a QSocketNotifier. When using GLib, the DBusAddWatchFunction
4789 * could call g_io_add_watch(), or could be used as part of a more
4790 * elaborate GSource. Note that when a watch is added, it may
4793 * The DBusWatchToggledFunction notifies the application that the
4794 * watch has been enabled or disabled. Call dbus_watch_get_enabled()
4795 * to check this. A disabled watch should have no effect, and enabled
4796 * watch should be added to the main loop. This feature is used
4797 * instead of simply adding/removing the watch because
4798 * enabling/disabling can be done without memory allocation. The
4799 * toggled function may be NULL if a main loop re-queries
4800 * dbus_watch_get_enabled() every time anyway.
4802 * The DBusWatch can be queried for the file descriptor to watch using
4803 * dbus_watch_get_unix_fd() or dbus_watch_get_socket(), and for the
4804 * events to watch for using dbus_watch_get_flags(). The flags
4805 * returned by dbus_watch_get_flags() will only contain
4806 * DBUS_WATCH_READABLE and DBUS_WATCH_WRITABLE, never
4807 * DBUS_WATCH_HANGUP or DBUS_WATCH_ERROR; all watches implicitly
4808 * include a watch for hangups, errors, and other exceptional
4811 * Once a file descriptor becomes readable or writable, or an exception
4812 * occurs, dbus_watch_handle() should be called to
4813 * notify the connection of the file descriptor's condition.
4815 * dbus_watch_handle() cannot be called during the
4816 * DBusAddWatchFunction, as the connection will not be ready to handle
4819 * It is not allowed to reference a DBusWatch after it has been passed
4820 * to remove_function.
4822 * If #FALSE is returned due to lack of memory, the failure may be due
4823 * to a #FALSE return from the new add_function. If so, the
4824 * add_function may have been called successfully one or more times,
4825 * but the remove_function will also have been called to remove any
4826 * successful adds. i.e. if #FALSE is returned the net result
4827 * should be that dbus_connection_set_watch_functions() has no effect,
4828 * but the add_function and remove_function may have been called.
4830 * @note The thread lock on DBusConnection is held while
4831 * watch functions are invoked, so inside these functions you
4832 * may not invoke any methods on DBusConnection or it will deadlock.
4833 * See the comments in the code or http://lists.freedesktop.org/archives/dbus/2007-July/tread.html#8144
4834 * if you encounter this issue and want to attempt writing a patch.
4836 * @param connection the connection.
4837 * @param add_function function to begin monitoring a new descriptor.
4838 * @param remove_function function to stop monitoring a descriptor.
4839 * @param toggled_function function to notify of enable/disable
4840 * @param data data to pass to add_function and remove_function.
4841 * @param free_data_function function to be called to free the data.
4842 * @returns #FALSE on failure (no memory)
4845 dbus_connection_set_watch_functions (DBusConnection *connection,
4846 DBusAddWatchFunction add_function,
4847 DBusRemoveWatchFunction remove_function,
4848 DBusWatchToggledFunction toggled_function,
4850 DBusFreeFunction free_data_function)
4854 _dbus_return_val_if_fail (connection != NULL, FALSE);
4856 CONNECTION_LOCK (connection);
4858 retval = _dbus_watch_list_set_functions (connection->watches,
4859 add_function, remove_function,
4861 data, free_data_function);
4863 CONNECTION_UNLOCK (connection);
4869 * Sets the timeout functions for the connection. These functions are
4870 * responsible for making the application's main loop aware of timeouts.
4871 * When using Qt, typically the DBusAddTimeoutFunction would create a
4872 * QTimer. When using GLib, the DBusAddTimeoutFunction would call
4875 * The DBusTimeoutToggledFunction notifies the application that the
4876 * timeout has been enabled or disabled. Call
4877 * dbus_timeout_get_enabled() to check this. A disabled timeout should
4878 * have no effect, and enabled timeout should be added to the main
4879 * loop. This feature is used instead of simply adding/removing the
4880 * timeout because enabling/disabling can be done without memory
4881 * allocation. With Qt, QTimer::start() and QTimer::stop() can be used
4882 * to enable and disable. The toggled function may be NULL if a main
4883 * loop re-queries dbus_timeout_get_enabled() every time anyway.
4884 * Whenever a timeout is toggled, its interval may change.
4886 * The DBusTimeout can be queried for the timer interval using
4887 * dbus_timeout_get_interval(). dbus_timeout_handle() should be called
4888 * repeatedly, each time the interval elapses, starting after it has
4889 * elapsed once. The timeout stops firing when it is removed with the
4890 * given remove_function. The timer interval may change whenever the
4891 * timeout is added, removed, or toggled.
4893 * @note The thread lock on DBusConnection is held while
4894 * timeout functions are invoked, so inside these functions you
4895 * may not invoke any methods on DBusConnection or it will deadlock.
4896 * See the comments in the code or http://lists.freedesktop.org/archives/dbus/2007-July/thread.html#8144
4897 * if you encounter this issue and want to attempt writing a patch.
4899 * @param connection the connection.
4900 * @param add_function function to add a timeout.
4901 * @param remove_function function to remove a timeout.
4902 * @param toggled_function function to notify of enable/disable
4903 * @param data data to pass to add_function and remove_function.
4904 * @param free_data_function function to be called to free the data.
4905 * @returns #FALSE on failure (no memory)
4908 dbus_connection_set_timeout_functions (DBusConnection *connection,
4909 DBusAddTimeoutFunction add_function,
4910 DBusRemoveTimeoutFunction remove_function,
4911 DBusTimeoutToggledFunction toggled_function,
4913 DBusFreeFunction free_data_function)
4917 _dbus_return_val_if_fail (connection != NULL, FALSE);
4919 CONNECTION_LOCK (connection);
4921 retval = _dbus_timeout_list_set_functions (connection->timeouts,
4922 add_function, remove_function,
4924 data, free_data_function);
4926 CONNECTION_UNLOCK (connection);
4932 * Sets the mainloop wakeup function for the connection. This function
4933 * is responsible for waking up the main loop (if its sleeping in
4934 * another thread) when some some change has happened to the
4935 * connection that the mainloop needs to reconsider (e.g. a message
4936 * has been queued for writing). When using Qt, this typically
4937 * results in a call to QEventLoop::wakeUp(). When using GLib, it
4938 * would call g_main_context_wakeup().
4940 * @param connection the connection.
4941 * @param wakeup_main_function function to wake up the mainloop
4942 * @param data data to pass wakeup_main_function
4943 * @param free_data_function function to be called to free the data.
4946 dbus_connection_set_wakeup_main_function (DBusConnection *connection,
4947 DBusWakeupMainFunction wakeup_main_function,
4949 DBusFreeFunction free_data_function)
4952 DBusFreeFunction old_free_data;
4954 _dbus_return_if_fail (connection != NULL);
4956 CONNECTION_LOCK (connection);
4957 old_data = connection->wakeup_main_data;
4958 old_free_data = connection->free_wakeup_main_data;
4960 connection->wakeup_main_function = wakeup_main_function;
4961 connection->wakeup_main_data = data;
4962 connection->free_wakeup_main_data = free_data_function;
4964 CONNECTION_UNLOCK (connection);
4966 /* Callback outside the lock */
4968 (*old_free_data) (old_data);
4972 * Set a function to be invoked when the dispatch status changes.
4973 * If the dispatch status is #DBUS_DISPATCH_DATA_REMAINS, then
4974 * dbus_connection_dispatch() needs to be called to process incoming
4975 * messages. However, dbus_connection_dispatch() MUST NOT BE CALLED
4976 * from inside the DBusDispatchStatusFunction. Indeed, almost
4977 * any reentrancy in this function is a bad idea. Instead,
4978 * the DBusDispatchStatusFunction should simply save an indication
4979 * that messages should be dispatched later, when the main loop
4982 * If you don't set a dispatch status function, you have to be sure to
4983 * dispatch on every iteration of your main loop, especially if
4984 * dbus_watch_handle() or dbus_timeout_handle() were called.
4986 * @param connection the connection
4987 * @param function function to call on dispatch status changes
4988 * @param data data for function
4989 * @param free_data_function free the function data
4992 dbus_connection_set_dispatch_status_function (DBusConnection *connection,
4993 DBusDispatchStatusFunction function,
4995 DBusFreeFunction free_data_function)
4998 DBusFreeFunction old_free_data;
5000 _dbus_return_if_fail (connection != NULL);
5002 CONNECTION_LOCK (connection);
5003 old_data = connection->dispatch_status_data;
5004 old_free_data = connection->free_dispatch_status_data;
5006 connection->dispatch_status_function = function;
5007 connection->dispatch_status_data = data;
5008 connection->free_dispatch_status_data = free_data_function;
5010 CONNECTION_UNLOCK (connection);
5012 /* Callback outside the lock */
5014 (*old_free_data) (old_data);
5018 * Get the UNIX file descriptor of the connection, if any. This can
5019 * be used for SELinux access control checks with getpeercon() for
5020 * example. DO NOT read or write to the file descriptor, or try to
5021 * select() on it; use DBusWatch for main loop integration. Not all
5022 * connections will have a file descriptor. So for adding descriptors
5023 * to the main loop, use dbus_watch_get_unix_fd() and so forth.
5025 * If the connection is socket-based, you can also use
5026 * dbus_connection_get_socket(), which will work on Windows too.
5027 * This function always fails on Windows.
5029 * Right now the returned descriptor is always a socket, but
5030 * that is not guaranteed.
5032 * @param connection the connection
5033 * @param fd return location for the file descriptor.
5034 * @returns #TRUE if fd is successfully obtained.
5037 dbus_connection_get_unix_fd (DBusConnection *connection,
5040 _dbus_return_val_if_fail (connection != NULL, FALSE);
5041 _dbus_return_val_if_fail (connection->transport != NULL, FALSE);
5044 /* FIXME do this on a lower level */
5048 return dbus_connection_get_socket(connection, fd);
5052 * Gets the underlying Windows or UNIX socket file descriptor
5053 * of the connection, if any. DO NOT read or write to the file descriptor, or try to
5054 * select() on it; use DBusWatch for main loop integration. Not all
5055 * connections will have a socket. So for adding descriptors
5056 * to the main loop, use dbus_watch_get_socket() and so forth.
5058 * If the connection is not socket-based, this function will return FALSE,
5059 * even if the connection does have a file descriptor of some kind.
5060 * i.e. this function always returns specifically a socket file descriptor.
5062 * @param connection the connection
5063 * @param fd return location for the file descriptor.
5064 * @returns #TRUE if fd is successfully obtained.
5067 dbus_connection_get_socket(DBusConnection *connection,
5072 _dbus_return_val_if_fail (connection != NULL, FALSE);
5073 _dbus_return_val_if_fail (connection->transport != NULL, FALSE);
5075 CONNECTION_LOCK (connection);
5077 retval = _dbus_transport_get_socket_fd (connection->transport,
5080 CONNECTION_UNLOCK (connection);
5087 * Gets the UNIX user ID of the connection if known. Returns #TRUE if
5088 * the uid is filled in. Always returns #FALSE on non-UNIX platforms
5089 * for now, though in theory someone could hook Windows to NIS or
5090 * something. Always returns #FALSE prior to authenticating the
5093 * The UID is only read by servers from clients; clients can't usually
5094 * get the UID of servers, because servers do not authenticate to
5095 * clients. The returned UID is the UID the connection authenticated
5098 * The message bus is a server and the apps connecting to the bus
5101 * You can ask the bus to tell you the UID of another connection though
5102 * if you like; this is done with dbus_bus_get_unix_user().
5104 * @param connection the connection
5105 * @param uid return location for the user ID
5106 * @returns #TRUE if uid is filled in with a valid user ID
5109 dbus_connection_get_unix_user (DBusConnection *connection,
5114 _dbus_return_val_if_fail (connection != NULL, FALSE);
5115 _dbus_return_val_if_fail (uid != NULL, FALSE);
5117 CONNECTION_LOCK (connection);
5119 if (!_dbus_transport_get_is_authenticated (connection->transport))
5122 result = _dbus_transport_get_unix_user (connection->transport,
5126 _dbus_assert (!result);
5129 CONNECTION_UNLOCK (connection);
5135 * Gets the process ID of the connection if any.
5136 * Returns #TRUE if the pid is filled in.
5137 * Always returns #FALSE prior to authenticating the
5140 * @param connection the connection
5141 * @param pid return location for the process ID
5142 * @returns #TRUE if uid is filled in with a valid process ID
5145 dbus_connection_get_unix_process_id (DBusConnection *connection,
5150 _dbus_return_val_if_fail (connection != NULL, FALSE);
5151 _dbus_return_val_if_fail (pid != NULL, FALSE);
5153 CONNECTION_LOCK (connection);
5155 if (!_dbus_transport_get_is_authenticated (connection->transport))
5158 result = _dbus_transport_get_unix_process_id (connection->transport,
5161 CONNECTION_UNLOCK (connection);
5167 * Gets the ADT audit data of the connection if any.
5168 * Returns #TRUE if the structure pointer is returned.
5169 * Always returns #FALSE prior to authenticating the
5172 * @param connection the connection
5173 * @param data return location for audit data
5174 * @returns #TRUE if audit data is filled in with a valid ucred pointer
5177 dbus_connection_get_adt_audit_session_data (DBusConnection *connection,
5179 dbus_int32_t *data_size)
5183 _dbus_return_val_if_fail (connection != NULL, FALSE);
5184 _dbus_return_val_if_fail (data != NULL, FALSE);
5185 _dbus_return_val_if_fail (data_size != NULL, FALSE);
5187 CONNECTION_LOCK (connection);
5189 if (!_dbus_transport_get_is_authenticated (connection->transport))
5192 result = _dbus_transport_get_adt_audit_session_data (connection->transport,
5195 CONNECTION_UNLOCK (connection);
5201 * Sets a predicate function used to determine whether a given user ID
5202 * is allowed to connect. When an incoming connection has
5203 * authenticated with a particular user ID, this function is called;
5204 * if it returns #TRUE, the connection is allowed to proceed,
5205 * otherwise the connection is disconnected.
5207 * If the function is set to #NULL (as it is by default), then
5208 * only the same UID as the server process will be allowed to
5209 * connect. Also, root is always allowed to connect.
5211 * On Windows, the function will be set and its free_data_function will
5212 * be invoked when the connection is freed or a new function is set.
5213 * However, the function will never be called, because there are
5214 * no UNIX user ids to pass to it, or at least none of the existing
5215 * auth protocols would allow authenticating as a UNIX user on Windows.
5217 * @param connection the connection
5218 * @param function the predicate
5219 * @param data data to pass to the predicate
5220 * @param free_data_function function to free the data
5223 dbus_connection_set_unix_user_function (DBusConnection *connection,
5224 DBusAllowUnixUserFunction function,
5226 DBusFreeFunction free_data_function)
5228 void *old_data = NULL;
5229 DBusFreeFunction old_free_function = NULL;
5231 _dbus_return_if_fail (connection != NULL);
5233 CONNECTION_LOCK (connection);
5234 _dbus_transport_set_unix_user_function (connection->transport,
5235 function, data, free_data_function,
5236 &old_data, &old_free_function);
5237 CONNECTION_UNLOCK (connection);
5239 if (old_free_function != NULL)
5240 (* old_free_function) (old_data);
5244 * Gets the Windows user SID of the connection if known. Returns
5245 * #TRUE if the ID is filled in. Always returns #FALSE on non-Windows
5246 * platforms for now, though in theory someone could hook UNIX to
5247 * Active Directory or something. Always returns #FALSE prior to
5248 * authenticating the connection.
5250 * The user is only read by servers from clients; clients can't usually
5251 * get the user of servers, because servers do not authenticate to
5252 * clients. The returned user is the user the connection authenticated
5255 * The message bus is a server and the apps connecting to the bus
5258 * The returned user string has to be freed with dbus_free().
5260 * The return value indicates whether the user SID is available;
5261 * if it's available but we don't have the memory to copy it,
5262 * then the return value is #TRUE and #NULL is given as the SID.
5264 * @todo We would like to be able to say "You can ask the bus to tell
5265 * you the user of another connection though if you like; this is done
5266 * with dbus_bus_get_windows_user()." But this has to be implemented
5267 * in bus/driver.c and dbus/dbus-bus.c, and is pointless anyway
5268 * since on Windows we only use the session bus for now.
5270 * @param connection the connection
5271 * @param windows_sid_p return location for an allocated copy of the user ID, or #NULL if no memory
5272 * @returns #TRUE if user is available (returned value may be #NULL anyway if no memory)
5275 dbus_connection_get_windows_user (DBusConnection *connection,
5276 char **windows_sid_p)
5280 _dbus_return_val_if_fail (connection != NULL, FALSE);
5281 _dbus_return_val_if_fail (windows_sid_p != NULL, FALSE);
5283 CONNECTION_LOCK (connection);
5285 if (!_dbus_transport_get_is_authenticated (connection->transport))
5288 result = _dbus_transport_get_windows_user (connection->transport,
5292 _dbus_assert (!result);
5295 CONNECTION_UNLOCK (connection);
5301 * Sets a predicate function used to determine whether a given user ID
5302 * is allowed to connect. When an incoming connection has
5303 * authenticated with a particular user ID, this function is called;
5304 * if it returns #TRUE, the connection is allowed to proceed,
5305 * otherwise the connection is disconnected.
5307 * If the function is set to #NULL (as it is by default), then
5308 * only the same user owning the server process will be allowed to
5311 * On UNIX, the function will be set and its free_data_function will
5312 * be invoked when the connection is freed or a new function is set.
5313 * However, the function will never be called, because there is no
5314 * way right now to authenticate as a Windows user on UNIX.
5316 * @param connection the connection
5317 * @param function the predicate
5318 * @param data data to pass to the predicate
5319 * @param free_data_function function to free the data
5322 dbus_connection_set_windows_user_function (DBusConnection *connection,
5323 DBusAllowWindowsUserFunction function,
5325 DBusFreeFunction free_data_function)
5327 void *old_data = NULL;
5328 DBusFreeFunction old_free_function = NULL;
5330 _dbus_return_if_fail (connection != NULL);
5332 CONNECTION_LOCK (connection);
5333 _dbus_transport_set_windows_user_function (connection->transport,
5334 function, data, free_data_function,
5335 &old_data, &old_free_function);
5336 CONNECTION_UNLOCK (connection);
5338 if (old_free_function != NULL)
5339 (* old_free_function) (old_data);
5343 * This function must be called on the server side of a connection when the
5344 * connection is first seen in the #DBusNewConnectionFunction. If set to
5345 * #TRUE (the default is #FALSE), then the connection can proceed even if
5346 * the client does not authenticate as some user identity, i.e. clients
5347 * can connect anonymously.
5349 * This setting interacts with the available authorization mechanisms
5350 * (see dbus_server_set_auth_mechanisms()). Namely, an auth mechanism
5351 * such as ANONYMOUS that supports anonymous auth must be included in
5352 * the list of available mechanisms for anonymous login to work.
5354 * This setting also changes the default rule for connections
5355 * authorized as a user; normally, if a connection authorizes as
5356 * a user identity, it is permitted if the user identity is
5357 * root or the user identity matches the user identity of the server
5358 * process. If anonymous connections are allowed, however,
5359 * then any user identity is allowed.
5361 * You can override the rules for connections authorized as a
5362 * user identity with dbus_connection_set_unix_user_function()
5363 * and dbus_connection_set_windows_user_function().
5365 * @param connection the connection
5366 * @param value whether to allow authentication as an anonymous user
5369 dbus_connection_set_allow_anonymous (DBusConnection *connection,
5372 _dbus_return_if_fail (connection != NULL);
5374 CONNECTION_LOCK (connection);
5375 _dbus_transport_set_allow_anonymous (connection->transport, value);
5376 CONNECTION_UNLOCK (connection);
5381 * Normally #DBusConnection automatically handles all messages to the
5382 * org.freedesktop.DBus.Peer interface. However, the message bus wants
5383 * to be able to route methods on that interface through the bus and
5384 * to other applications. If routing peer messages is enabled, then
5385 * messages with the org.freedesktop.DBus.Peer interface that also
5386 * have a bus destination name set will not be automatically
5387 * handled by the #DBusConnection and instead will be dispatched
5388 * normally to the application.
5390 * If a normal application sets this flag, it can break things badly.
5391 * So don't set this unless you are the message bus.
5393 * @param connection the connection
5394 * @param value #TRUE to pass through org.freedesktop.DBus.Peer messages with a bus name set
5397 dbus_connection_set_route_peer_messages (DBusConnection *connection,
5400 _dbus_return_if_fail (connection != NULL);
5402 CONNECTION_LOCK (connection);
5403 connection->route_peer_messages = TRUE;
5404 CONNECTION_UNLOCK (connection);
5408 * Adds a message filter. Filters are handlers that are run on all
5409 * incoming messages, prior to the objects registered with
5410 * dbus_connection_register_object_path(). Filters are run in the
5411 * order that they were added. The same handler can be added as a
5412 * filter more than once, in which case it will be run more than once.
5413 * Filters added during a filter callback won't be run on the message
5416 * @todo we don't run filters on messages while blocking without
5417 * entering the main loop, since filters are run as part of
5418 * dbus_connection_dispatch(). This is probably a feature, as filters
5419 * could create arbitrary reentrancy. But kind of sucks if you're
5420 * trying to filter METHOD_RETURN for some reason.
5422 * @param connection the connection
5423 * @param function function to handle messages
5424 * @param user_data user data to pass to the function
5425 * @param free_data_function function to use for freeing user data
5426 * @returns #TRUE on success, #FALSE if not enough memory.
5429 dbus_connection_add_filter (DBusConnection *connection,
5430 DBusHandleMessageFunction function,
5432 DBusFreeFunction free_data_function)
5434 DBusMessageFilter *filter;
5436 _dbus_return_val_if_fail (connection != NULL, FALSE);
5437 _dbus_return_val_if_fail (function != NULL, FALSE);
5439 filter = dbus_new0 (DBusMessageFilter, 1);
5443 _dbus_atomic_inc (&filter->refcount);
5445 CONNECTION_LOCK (connection);
5447 if (!_dbus_list_append (&connection->filter_list,
5450 _dbus_message_filter_unref (filter);
5451 CONNECTION_UNLOCK (connection);
5455 /* Fill in filter after all memory allocated,
5456 * so we don't run the free_user_data_function
5457 * if the add_filter() fails
5460 filter->function = function;
5461 filter->user_data = user_data;
5462 filter->free_user_data_function = free_data_function;
5464 CONNECTION_UNLOCK (connection);
5469 * Removes a previously-added message filter. It is a programming
5470 * error to call this function for a handler that has not been added
5471 * as a filter. If the given handler was added more than once, only
5472 * one instance of it will be removed (the most recently-added
5475 * @param connection the connection
5476 * @param function the handler to remove
5477 * @param user_data user data for the handler to remove
5481 dbus_connection_remove_filter (DBusConnection *connection,
5482 DBusHandleMessageFunction function,
5486 DBusMessageFilter *filter;
5488 _dbus_return_if_fail (connection != NULL);
5489 _dbus_return_if_fail (function != NULL);
5491 CONNECTION_LOCK (connection);
5495 link = _dbus_list_get_last_link (&connection->filter_list);
5496 while (link != NULL)
5498 filter = link->data;
5500 if (filter->function == function &&
5501 filter->user_data == user_data)
5503 _dbus_list_remove_link (&connection->filter_list, link);
5504 filter->function = NULL;
5509 link = _dbus_list_get_prev_link (&connection->filter_list, link);
5513 CONNECTION_UNLOCK (connection);
5515 #ifndef DBUS_DISABLE_CHECKS
5518 _dbus_warn_check_failed ("Attempt to remove filter function %p user data %p, but no such filter has been added\n",
5519 function, user_data);
5524 /* Call application code */
5525 if (filter->free_user_data_function)
5526 (* filter->free_user_data_function) (filter->user_data);
5528 filter->free_user_data_function = NULL;
5529 filter->user_data = NULL;
5531 _dbus_message_filter_unref (filter);
5535 * Registers a handler for a given path or subsection in the object
5536 * hierarchy. The given vtable handles messages sent to exactly the
5537 * given path or also for paths bellow that, depending on fallback
5540 * @param connection the connection
5541 * @param fallback whether to handle messages also for "subdirectory"
5542 * @param path a '/' delimited string of path elements
5543 * @param vtable the virtual table
5544 * @param user_data data to pass to functions in the vtable
5545 * @param error address where an error can be returned
5546 * @returns #FALSE if an error (#DBUS_ERROR_NO_MEMORY or
5547 * #DBUS_ERROR_OBJECT_PATH_IN_USE) is reported
5550 _dbus_connection_register_object_path (DBusConnection *connection,
5551 dbus_bool_t fallback,
5553 const DBusObjectPathVTable *vtable,
5557 char **decomposed_path;
5560 if (!_dbus_decompose_path (path, strlen (path), &decomposed_path, NULL))
5563 CONNECTION_LOCK (connection);
5565 retval = _dbus_object_tree_register (connection->objects,
5567 (const char **) decomposed_path, vtable,
5570 CONNECTION_UNLOCK (connection);
5572 dbus_free_string_array (decomposed_path);
5578 * Registers a handler for a given path in the object hierarchy.
5579 * The given vtable handles messages sent to exactly the given path.
5581 * @param connection the connection
5582 * @param path a '/' delimited string of path elements
5583 * @param vtable the virtual table
5584 * @param user_data data to pass to functions in the vtable
5585 * @param error address where an error can be returned
5586 * @returns #FALSE if an error (#DBUS_ERROR_NO_MEMORY or
5587 * #DBUS_ERROR_OBJECT_PATH_IN_USE) is reported
5590 dbus_connection_try_register_object_path (DBusConnection *connection,
5592 const DBusObjectPathVTable *vtable,
5596 _dbus_return_val_if_fail (connection != NULL, FALSE);
5597 _dbus_return_val_if_fail (path != NULL, FALSE);
5598 _dbus_return_val_if_fail (path[0] == '/', FALSE);
5599 _dbus_return_val_if_fail (vtable != NULL, FALSE);
5601 return _dbus_connection_register_object_path (connection, FALSE, path, vtable, user_data, error);
5605 * Registers a handler for a given path in the object hierarchy.
5606 * The given vtable handles messages sent to exactly the given path.
5608 * It is a bug to call this function for object paths which already
5609 * have a handler. Use dbus_connection_try_register_object_path() if this
5610 * might be the case.
5612 * @param connection the connection
5613 * @param path a '/' delimited string of path elements
5614 * @param vtable the virtual table
5615 * @param user_data data to pass to functions in the vtable
5616 * @returns #FALSE if an error (#DBUS_ERROR_NO_MEMORY or
5617 * #DBUS_ERROR_OBJECT_PATH_IN_USE) ocurred
5620 dbus_connection_register_object_path (DBusConnection *connection,
5622 const DBusObjectPathVTable *vtable,
5626 DBusError error = DBUS_ERROR_INIT;
5628 _dbus_return_val_if_fail (connection != NULL, FALSE);
5629 _dbus_return_val_if_fail (path != NULL, FALSE);
5630 _dbus_return_val_if_fail (path[0] == '/', FALSE);
5631 _dbus_return_val_if_fail (vtable != NULL, FALSE);
5633 retval = _dbus_connection_register_object_path (connection, FALSE, path, vtable, user_data, &error);
5635 if (dbus_error_has_name (&error, DBUS_ERROR_OBJECT_PATH_IN_USE))
5637 _dbus_warn ("%s\n", error.message);
5638 dbus_error_free (&error);
5646 * Registers a fallback handler for a given subsection of the object
5647 * hierarchy. The given vtable handles messages at or below the given
5648 * path. You can use this to establish a default message handling
5649 * policy for a whole "subdirectory."
5651 * @param connection the connection
5652 * @param path a '/' delimited string of path elements
5653 * @param vtable the virtual table
5654 * @param user_data data to pass to functions in the vtable
5655 * @param error address where an error can be returned
5656 * @returns #FALSE if an error (#DBUS_ERROR_NO_MEMORY or
5657 * #DBUS_ERROR_OBJECT_PATH_IN_USE) is reported
5660 dbus_connection_try_register_fallback (DBusConnection *connection,
5662 const DBusObjectPathVTable *vtable,
5666 _dbus_return_val_if_fail (connection != NULL, FALSE);
5667 _dbus_return_val_if_fail (path != NULL, FALSE);
5668 _dbus_return_val_if_fail (path[0] == '/', FALSE);
5669 _dbus_return_val_if_fail (vtable != NULL, FALSE);
5671 return _dbus_connection_register_object_path (connection, TRUE, path, vtable, user_data, error);
5675 * Registers a fallback handler for a given subsection of the object
5676 * hierarchy. The given vtable handles messages at or below the given
5677 * path. You can use this to establish a default message handling
5678 * policy for a whole "subdirectory."
5680 * It is a bug to call this function for object paths which already
5681 * have a handler. Use dbus_connection_try_register_fallback() if this
5682 * might be the case.
5684 * @param connection the connection
5685 * @param path a '/' delimited string of path elements
5686 * @param vtable the virtual table
5687 * @param user_data data to pass to functions in the vtable
5688 * @returns #FALSE if an error (#DBUS_ERROR_NO_MEMORY or
5689 * #DBUS_ERROR_OBJECT_PATH_IN_USE) occured
5692 dbus_connection_register_fallback (DBusConnection *connection,
5694 const DBusObjectPathVTable *vtable,
5698 DBusError error = DBUS_ERROR_INIT;
5700 _dbus_return_val_if_fail (connection != NULL, FALSE);
5701 _dbus_return_val_if_fail (path != NULL, FALSE);
5702 _dbus_return_val_if_fail (path[0] == '/', FALSE);
5703 _dbus_return_val_if_fail (vtable != NULL, FALSE);
5705 retval = _dbus_connection_register_object_path (connection, TRUE, path, vtable, user_data, &error);
5707 if (dbus_error_has_name (&error, DBUS_ERROR_OBJECT_PATH_IN_USE))
5709 _dbus_warn ("%s\n", error.message);
5710 dbus_error_free (&error);
5718 * Unregisters the handler registered with exactly the given path.
5719 * It's a bug to call this function for a path that isn't registered.
5720 * Can unregister both fallback paths and object paths.
5722 * @param connection the connection
5723 * @param path a '/' delimited string of path elements
5724 * @returns #FALSE if not enough memory
5727 dbus_connection_unregister_object_path (DBusConnection *connection,
5730 char **decomposed_path;
5732 _dbus_return_val_if_fail (connection != NULL, FALSE);
5733 _dbus_return_val_if_fail (path != NULL, FALSE);
5734 _dbus_return_val_if_fail (path[0] == '/', FALSE);
5736 if (!_dbus_decompose_path (path, strlen (path), &decomposed_path, NULL))
5739 CONNECTION_LOCK (connection);
5741 _dbus_object_tree_unregister_and_unlock (connection->objects, (const char **) decomposed_path);
5743 dbus_free_string_array (decomposed_path);
5749 * Gets the user data passed to dbus_connection_register_object_path()
5750 * or dbus_connection_register_fallback(). If nothing was registered
5751 * at this path, the data is filled in with #NULL.
5753 * @param connection the connection
5754 * @param path the path you registered with
5755 * @param data_p location to store the user data, or #NULL
5756 * @returns #FALSE if not enough memory
5759 dbus_connection_get_object_path_data (DBusConnection *connection,
5763 char **decomposed_path;
5765 _dbus_return_val_if_fail (connection != NULL, FALSE);
5766 _dbus_return_val_if_fail (path != NULL, FALSE);
5767 _dbus_return_val_if_fail (data_p != NULL, FALSE);
5771 if (!_dbus_decompose_path (path, strlen (path), &decomposed_path, NULL))
5774 CONNECTION_LOCK (connection);
5776 *data_p = _dbus_object_tree_get_user_data_unlocked (connection->objects, (const char**) decomposed_path);
5778 CONNECTION_UNLOCK (connection);
5780 dbus_free_string_array (decomposed_path);
5786 * Lists the registered fallback handlers and object path handlers at
5787 * the given parent_path. The returned array should be freed with
5788 * dbus_free_string_array().
5790 * @param connection the connection
5791 * @param parent_path the path to list the child handlers of
5792 * @param child_entries returns #NULL-terminated array of children
5793 * @returns #FALSE if no memory to allocate the child entries
5796 dbus_connection_list_registered (DBusConnection *connection,
5797 const char *parent_path,
5798 char ***child_entries)
5800 char **decomposed_path;
5802 _dbus_return_val_if_fail (connection != NULL, FALSE);
5803 _dbus_return_val_if_fail (parent_path != NULL, FALSE);
5804 _dbus_return_val_if_fail (parent_path[0] == '/', FALSE);
5805 _dbus_return_val_if_fail (child_entries != NULL, FALSE);
5807 if (!_dbus_decompose_path (parent_path, strlen (parent_path), &decomposed_path, NULL))
5810 CONNECTION_LOCK (connection);
5812 retval = _dbus_object_tree_list_registered_and_unlock (connection->objects,
5813 (const char **) decomposed_path,
5815 dbus_free_string_array (decomposed_path);
5820 static DBusDataSlotAllocator slot_allocator;
5821 _DBUS_DEFINE_GLOBAL_LOCK (connection_slots);
5824 * Allocates an integer ID to be used for storing application-specific
5825 * data on any DBusConnection. The allocated ID may then be used
5826 * with dbus_connection_set_data() and dbus_connection_get_data().
5827 * The passed-in slot must be initialized to -1, and is filled in
5828 * with the slot ID. If the passed-in slot is not -1, it's assumed
5829 * to be already allocated, and its refcount is incremented.
5831 * The allocated slot is global, i.e. all DBusConnection objects will
5832 * have a slot with the given integer ID reserved.
5834 * @param slot_p address of a global variable storing the slot
5835 * @returns #FALSE on failure (no memory)
5838 dbus_connection_allocate_data_slot (dbus_int32_t *slot_p)
5840 return _dbus_data_slot_allocator_alloc (&slot_allocator,
5841 &_DBUS_LOCK_NAME (connection_slots),
5846 * Deallocates a global ID for connection data slots.
5847 * dbus_connection_get_data() and dbus_connection_set_data() may no
5848 * longer be used with this slot. Existing data stored on existing
5849 * DBusConnection objects will be freed when the connection is
5850 * finalized, but may not be retrieved (and may only be replaced if
5851 * someone else reallocates the slot). When the refcount on the
5852 * passed-in slot reaches 0, it is set to -1.
5854 * @param slot_p address storing the slot to deallocate
5857 dbus_connection_free_data_slot (dbus_int32_t *slot_p)
5859 _dbus_return_if_fail (*slot_p >= 0);
5861 _dbus_data_slot_allocator_free (&slot_allocator, slot_p);
5865 * Stores a pointer on a DBusConnection, along
5866 * with an optional function to be used for freeing
5867 * the data when the data is set again, or when
5868 * the connection is finalized. The slot number
5869 * must have been allocated with dbus_connection_allocate_data_slot().
5871 * @note This function does not take the
5872 * main thread lock on DBusConnection, which allows it to be
5873 * used from inside watch and timeout functions. (See the
5874 * note in docs for dbus_connection_set_watch_functions().)
5875 * A side effect of this is that you need to know there's
5876 * a reference held on the connection while invoking
5877 * dbus_connection_set_data(), or the connection could be
5878 * finalized during dbus_connection_set_data().
5880 * @param connection the connection
5881 * @param slot the slot number
5882 * @param data the data to store
5883 * @param free_data_func finalizer function for the data
5884 * @returns #TRUE if there was enough memory to store the data
5887 dbus_connection_set_data (DBusConnection *connection,
5890 DBusFreeFunction free_data_func)
5892 DBusFreeFunction old_free_func;
5896 _dbus_return_val_if_fail (connection != NULL, FALSE);
5897 _dbus_return_val_if_fail (slot >= 0, FALSE);
5899 SLOTS_LOCK (connection);
5901 retval = _dbus_data_slot_list_set (&slot_allocator,
5902 &connection->slot_list,
5903 slot, data, free_data_func,
5904 &old_free_func, &old_data);
5906 SLOTS_UNLOCK (connection);
5910 /* Do the actual free outside the connection lock */
5912 (* old_free_func) (old_data);
5919 * Retrieves data previously set with dbus_connection_set_data().
5920 * The slot must still be allocated (must not have been freed).
5922 * @note This function does not take the
5923 * main thread lock on DBusConnection, which allows it to be
5924 * used from inside watch and timeout functions. (See the
5925 * note in docs for dbus_connection_set_watch_functions().)
5926 * A side effect of this is that you need to know there's
5927 * a reference held on the connection while invoking
5928 * dbus_connection_get_data(), or the connection could be
5929 * finalized during dbus_connection_get_data().
5931 * @param connection the connection
5932 * @param slot the slot to get data from
5933 * @returns the data, or #NULL if not found
5936 dbus_connection_get_data (DBusConnection *connection,
5941 _dbus_return_val_if_fail (connection != NULL, NULL);
5943 SLOTS_LOCK (connection);
5945 res = _dbus_data_slot_list_get (&slot_allocator,
5946 &connection->slot_list,
5949 SLOTS_UNLOCK (connection);
5955 * This function sets a global flag for whether dbus_connection_new()
5956 * will set SIGPIPE behavior to SIG_IGN.
5958 * @param will_modify_sigpipe #TRUE to allow sigpipe to be set to SIG_IGN
5961 dbus_connection_set_change_sigpipe (dbus_bool_t will_modify_sigpipe)
5963 _dbus_modify_sigpipe = will_modify_sigpipe != FALSE;
5967 * Specifies the maximum size message this connection is allowed to
5968 * receive. Larger messages will result in disconnecting the
5971 * @param connection a #DBusConnection
5972 * @param size maximum message size the connection can receive, in bytes
5975 dbus_connection_set_max_message_size (DBusConnection *connection,
5978 _dbus_return_if_fail (connection != NULL);
5980 CONNECTION_LOCK (connection);
5981 _dbus_transport_set_max_message_size (connection->transport,
5983 CONNECTION_UNLOCK (connection);
5987 * Gets the value set by dbus_connection_set_max_message_size().
5989 * @param connection the connection
5990 * @returns the max size of a single message
5993 dbus_connection_get_max_message_size (DBusConnection *connection)
5997 _dbus_return_val_if_fail (connection != NULL, 0);
5999 CONNECTION_LOCK (connection);
6000 res = _dbus_transport_get_max_message_size (connection->transport);
6001 CONNECTION_UNLOCK (connection);
6006 * Specifies the maximum number of unix fds a message on this
6007 * connection is allowed to receive. Messages with more unix fds will
6008 * result in disconnecting the connection.
6010 * @param connection a #DBusConnection
6011 * @param size maximum message unix fds the connection can receive
6014 dbus_connection_set_max_message_unix_fds (DBusConnection *connection,
6017 _dbus_return_if_fail (connection != NULL);
6019 CONNECTION_LOCK (connection);
6020 _dbus_transport_set_max_message_unix_fds (connection->transport,
6022 CONNECTION_UNLOCK (connection);
6026 * Gets the value set by dbus_connection_set_max_message_unix_fds().
6028 * @param connection the connection
6029 * @returns the max numer of unix fds of a single message
6032 dbus_connection_get_max_message_unix_fds (DBusConnection *connection)
6036 _dbus_return_val_if_fail (connection != NULL, 0);
6038 CONNECTION_LOCK (connection);
6039 res = _dbus_transport_get_max_message_unix_fds (connection->transport);
6040 CONNECTION_UNLOCK (connection);
6045 * Sets the maximum total number of bytes that can be used for all messages
6046 * received on this connection. Messages count toward the maximum until
6047 * they are finalized. When the maximum is reached, the connection will
6048 * not read more data until some messages are finalized.
6050 * The semantics of the maximum are: if outstanding messages are
6051 * already above the maximum, additional messages will not be read.
6052 * The semantics are not: if the next message would cause us to exceed
6053 * the maximum, we don't read it. The reason is that we don't know the
6054 * size of a message until after we read it.
6056 * Thus, the max live messages size can actually be exceeded
6057 * by up to the maximum size of a single message.
6059 * Also, if we read say 1024 bytes off the wire in a single read(),
6060 * and that contains a half-dozen small messages, we may exceed the
6061 * size max by that amount. But this should be inconsequential.
6063 * This does imply that we can't call read() with a buffer larger
6064 * than we're willing to exceed this limit by.
6066 * @param connection the connection
6067 * @param size the maximum size in bytes of all outstanding messages
6070 dbus_connection_set_max_received_size (DBusConnection *connection,
6073 _dbus_return_if_fail (connection != NULL);
6075 CONNECTION_LOCK (connection);
6076 _dbus_transport_set_max_received_size (connection->transport,
6078 CONNECTION_UNLOCK (connection);
6082 * Gets the value set by dbus_connection_set_max_received_size().
6084 * @param connection the connection
6085 * @returns the max size of all live messages
6088 dbus_connection_get_max_received_size (DBusConnection *connection)
6092 _dbus_return_val_if_fail (connection != NULL, 0);
6094 CONNECTION_LOCK (connection);
6095 res = _dbus_transport_get_max_received_size (connection->transport);
6096 CONNECTION_UNLOCK (connection);
6101 * Sets the maximum total number of unix fds that can be used for all messages
6102 * received on this connection. Messages count toward the maximum until
6103 * they are finalized. When the maximum is reached, the connection will
6104 * not read more data until some messages are finalized.
6106 * The semantics are analogous to those of dbus_connection_set_max_received_size().
6108 * @param connection the connection
6109 * @param size the maximum size in bytes of all outstanding messages
6112 dbus_connection_set_max_received_unix_fds (DBusConnection *connection,
6115 _dbus_return_if_fail (connection != NULL);
6117 CONNECTION_LOCK (connection);
6118 _dbus_transport_set_max_received_unix_fds (connection->transport,
6120 CONNECTION_UNLOCK (connection);
6124 * Gets the value set by dbus_connection_set_max_received_unix_fds().
6126 * @param connection the connection
6127 * @returns the max unix fds of all live messages
6130 dbus_connection_get_max_received_unix_fds (DBusConnection *connection)
6134 _dbus_return_val_if_fail (connection != NULL, 0);
6136 CONNECTION_LOCK (connection);
6137 res = _dbus_transport_get_max_received_unix_fds (connection->transport);
6138 CONNECTION_UNLOCK (connection);
6143 * Gets the approximate size in bytes of all messages in the outgoing
6144 * message queue. The size is approximate in that you shouldn't use
6145 * it to decide how many bytes to read off the network or anything
6146 * of that nature, as optimizations may choose to tell small white lies
6147 * to avoid performance overhead.
6149 * @param connection the connection
6150 * @returns the number of bytes that have been queued up but not sent
6153 dbus_connection_get_outgoing_size (DBusConnection *connection)
6157 _dbus_return_val_if_fail (connection != NULL, 0);
6159 CONNECTION_LOCK (connection);
6160 res = _dbus_counter_get_size_value (connection->outgoing_counter);
6161 CONNECTION_UNLOCK (connection);
6165 #ifdef DBUS_ENABLE_STATS
6167 _dbus_connection_get_stats (DBusConnection *connection,
6168 dbus_uint32_t *in_messages,
6169 dbus_uint32_t *in_bytes,
6170 dbus_uint32_t *in_fds,
6171 dbus_uint32_t *in_peak_bytes,
6172 dbus_uint32_t *in_peak_fds,
6173 dbus_uint32_t *out_messages,
6174 dbus_uint32_t *out_bytes,
6175 dbus_uint32_t *out_fds,
6176 dbus_uint32_t *out_peak_bytes,
6177 dbus_uint32_t *out_peak_fds)
6179 CONNECTION_LOCK (connection);
6181 if (in_messages != NULL)
6182 *in_messages = connection->n_incoming;
6184 _dbus_transport_get_stats (connection->transport,
6185 in_bytes, in_fds, in_peak_bytes, in_peak_fds);
6187 if (out_messages != NULL)
6188 *out_messages = connection->n_outgoing;
6190 if (out_bytes != NULL)
6191 *out_bytes = _dbus_counter_get_size_value (connection->outgoing_counter);
6193 if (out_fds != NULL)
6194 *out_fds = _dbus_counter_get_unix_fd_value (connection->outgoing_counter);
6196 if (out_peak_bytes != NULL)
6197 *out_peak_bytes = _dbus_counter_get_peak_size_value (connection->outgoing_counter);
6199 if (out_peak_fds != NULL)
6200 *out_peak_fds = _dbus_counter_get_peak_unix_fd_value (connection->outgoing_counter);
6202 CONNECTION_UNLOCK (connection);
6204 #endif /* DBUS_ENABLE_STATS */
6207 * Gets the approximate number of uni fds of all messages in the
6208 * outgoing message queue.
6210 * @param connection the connection
6211 * @returns the number of unix fds that have been queued up but not sent
6214 dbus_connection_get_outgoing_unix_fds (DBusConnection *connection)
6218 _dbus_return_val_if_fail (connection != NULL, 0);
6220 CONNECTION_LOCK (connection);
6221 res = _dbus_counter_get_unix_fd_value (connection->outgoing_counter);
6222 CONNECTION_UNLOCK (connection);