1 /* -*- mode: C; c-file-style: "gnu" -*- */
2 /* dbus-connection.c DBusConnection object
4 * Copyright (C) 2002, 2003, 2004, 2005 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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-list.h"
33 #include "dbus-hash.h"
34 #include "dbus-message-internal.h"
35 #include "dbus-threads.h"
36 #include "dbus-protocol.h"
37 #include "dbus-dataslot.h"
38 #include "dbus-string.h"
39 #include "dbus-pending-call.h"
40 #include "dbus-object-tree.h"
41 #include "dbus-threads-internal.h"
43 #ifdef DBUS_DISABLE_CHECKS
44 #define TOOK_LOCK_CHECK(connection)
45 #define RELEASING_LOCK_CHECK(connection)
46 #define HAVE_LOCK_CHECK(connection)
48 #define TOOK_LOCK_CHECK(connection) do { \
49 _dbus_assert (!(connection)->have_connection_lock); \
50 (connection)->have_connection_lock = TRUE; \
52 #define RELEASING_LOCK_CHECK(connection) do { \
53 _dbus_assert ((connection)->have_connection_lock); \
54 (connection)->have_connection_lock = FALSE; \
56 #define HAVE_LOCK_CHECK(connection) _dbus_assert ((connection)->have_connection_lock)
57 /* A "DO_NOT_HAVE_LOCK_CHECK" is impossible since we need the lock to check the flag */
62 #define CONNECTION_LOCK(connection) do { \
63 if (TRACE_LOCKS) { _dbus_verbose (" LOCK: %s\n", _DBUS_FUNCTION_NAME); } \
64 _dbus_mutex_lock ((connection)->mutex); \
65 TOOK_LOCK_CHECK (connection); \
68 #define CONNECTION_UNLOCK(connection) do { \
69 if (TRACE_LOCKS) { _dbus_verbose (" UNLOCK: %s\n", _DBUS_FUNCTION_NAME); } \
70 RELEASING_LOCK_CHECK (connection); \
71 _dbus_mutex_unlock ((connection)->mutex); \
74 #define DISPATCH_STATUS_NAME(s) \
75 ((s) == DBUS_DISPATCH_COMPLETE ? "complete" : \
76 (s) == DBUS_DISPATCH_DATA_REMAINS ? "data remains" : \
77 (s) == DBUS_DISPATCH_NEED_MEMORY ? "need memory" : \
81 * @defgroup DBusConnection DBusConnection
83 * @brief Connection to another application
85 * A DBusConnection represents a connection to another
86 * application. Messages can be sent and received via this connection.
87 * The other application may be a message bus; for convenience, the
88 * function dbus_bus_get() is provided to automatically open a
89 * connection to the well-known message buses.
91 * In brief a DBusConnection is a message queue associated with some
92 * message transport mechanism such as a socket. The connection
93 * maintains a queue of incoming messages and a queue of outgoing
96 * Incoming messages are normally processed by calling
97 * dbus_connection_dispatch(). dbus_connection_dispatch() runs any
98 * handlers registered for the topmost message in the message queue,
99 * then discards the message, then returns.
101 * dbus_connection_get_dispatch_status() indicates whether
102 * messages are currently in the queue that need dispatching.
103 * dbus_connection_set_dispatch_status_function() allows
104 * you to set a function to be used to monitor the dispatch status.
106 * If you're using GLib or Qt add-on libraries for D-BUS, there are
107 * special convenience APIs in those libraries that hide
108 * all the details of dispatch and watch/timeout monitoring.
109 * For example, dbus_connection_setup_with_g_main().
111 * If you aren't using these add-on libraries, you have to manually
112 * call dbus_connection_set_dispatch_status_function(),
113 * dbus_connection_set_watch_functions(),
114 * dbus_connection_set_timeout_functions() providing appropriate
115 * functions to integrate the connection with your application's main
118 * When you use dbus_connection_send() or one of its variants to send
119 * a message, the message is added to the outgoing queue. It's
120 * actually written to the network later; either in
121 * dbus_watch_handle() invoked by your main loop, or in
122 * dbus_connection_flush() which blocks until it can write out the
123 * entire outgoing queue. The GLib/Qt add-on libraries again
124 * handle the details here for you by setting up watch functions.
126 * When a connection is disconnected, you are guaranteed to get a
127 * signal "Disconnected" from the interface
128 * #DBUS_INTERFACE_LOCAL, path
131 * You may not drop the last reference to a #DBusConnection
132 * until that connection has been disconnected.
134 * You may dispatch the unprocessed incoming message queue even if the
135 * connection is disconnected. However, "Disconnected" will always be
136 * the last message in the queue (obviously no messages are received
137 * after disconnection).
139 * #DBusConnection has thread locks and drops them when invoking user
140 * callbacks, so in general is transparently threadsafe. However,
141 * #DBusMessage does NOT have thread locks; you must not send the same
142 * message to multiple #DBusConnection that will be used from
147 * @defgroup DBusConnectionInternals DBusConnection implementation details
148 * @ingroup DBusInternals
149 * @brief Implementation details of DBusConnection
155 * Internal struct representing a message filter function
157 typedef struct DBusMessageFilter DBusMessageFilter;
160 * Internal struct representing a message filter function
162 struct DBusMessageFilter
164 DBusAtomic refcount; /**< Reference count */
165 DBusHandleMessageFunction function; /**< Function to call to filter */
166 void *user_data; /**< User data for the function */
167 DBusFreeFunction free_user_data_function; /**< Function to free the user data */
172 * Internals of DBusPreallocatedSend
174 struct DBusPreallocatedSend
176 DBusConnection *connection; /**< Connection we'd send the message to */
177 DBusList *queue_link; /**< Preallocated link in the queue */
178 DBusList *counter_link; /**< Preallocated link in the resource counter */
181 static dbus_bool_t _dbus_modify_sigpipe = TRUE;
184 * Implementation details of DBusConnection. All fields are private.
186 struct DBusConnection
188 DBusAtomic refcount; /**< Reference count. */
190 DBusMutex *mutex; /**< Lock on the entire DBusConnection */
192 DBusMutex *dispatch_mutex; /**< Protects dispatch_acquired */
193 DBusCondVar *dispatch_cond; /**< Notify when dispatch_acquired is available */
194 DBusMutex *io_path_mutex; /**< Protects io_path_acquired */
195 DBusCondVar *io_path_cond; /**< Notify when io_path_acquired is available */
197 DBusList *outgoing_messages; /**< Queue of messages we need to send, send the end of the list first. */
198 DBusList *incoming_messages; /**< Queue of messages we have received, end of the list received most recently. */
200 DBusMessage *message_borrowed; /**< Filled in if the first incoming message has been borrowed;
201 * dispatch_acquired will be set by the borrower
204 int n_outgoing; /**< Length of outgoing queue. */
205 int n_incoming; /**< Length of incoming queue. */
207 DBusCounter *outgoing_counter; /**< Counts size of outgoing messages. */
209 DBusTransport *transport; /**< Object that sends/receives messages over network. */
210 DBusWatchList *watches; /**< Stores active watches. */
211 DBusTimeoutList *timeouts; /**< Stores active timeouts. */
213 DBusList *filter_list; /**< List of filters. */
215 DBusDataSlotList slot_list; /**< Data stored by allocated integer ID */
217 DBusHashTable *pending_replies; /**< Hash of message serials to #DBusPendingCall. */
219 dbus_uint32_t client_serial; /**< Client serial. Increments each time a message is sent */
220 DBusList *disconnect_message_link; /**< Preallocated list node for queueing the disconnection message */
222 DBusWakeupMainFunction wakeup_main_function; /**< Function to wake up the mainloop */
223 void *wakeup_main_data; /**< Application data for wakeup_main_function */
224 DBusFreeFunction free_wakeup_main_data; /**< free wakeup_main_data */
226 DBusDispatchStatusFunction dispatch_status_function; /**< Function on dispatch status changes */
227 void *dispatch_status_data; /**< Application data for dispatch_status_function */
228 DBusFreeFunction free_dispatch_status_data; /**< free dispatch_status_data */
230 DBusDispatchStatus last_dispatch_status; /**< The last dispatch status we reported to the application. */
232 DBusList *link_cache; /**< A cache of linked list links to prevent contention
233 * for the global linked list mempool lock
235 DBusObjectTree *objects; /**< Object path handlers registered with this connection */
237 char *server_guid; /**< GUID of server if we are in shared_connections, #NULL if server GUID is unknown or connection is private */
239 unsigned int shareable : 1; /**< #TRUE if connection can go in shared_connections once we know the GUID */
241 unsigned int dispatch_acquired : 1; /**< Someone has dispatch path (can drain incoming queue) */
242 unsigned int io_path_acquired : 1; /**< Someone has transport io path (can use the transport to read/write messages) */
244 unsigned int exit_on_disconnect : 1; /**< If #TRUE, exit after handling disconnect signal */
246 #ifndef DBUS_DISABLE_CHECKS
247 unsigned int have_connection_lock : 1; /**< Used to check locking */
250 #ifndef DBUS_DISABLE_CHECKS
251 int generation; /**< _dbus_current_generation that should correspond to this connection */
255 static DBusDispatchStatus _dbus_connection_get_dispatch_status_unlocked (DBusConnection *connection);
256 static void _dbus_connection_update_dispatch_status_and_unlock (DBusConnection *connection,
257 DBusDispatchStatus new_status);
258 static void _dbus_connection_last_unref (DBusConnection *connection);
259 static void _dbus_connection_acquire_dispatch (DBusConnection *connection);
260 static void _dbus_connection_release_dispatch (DBusConnection *connection);
262 static DBusMessageFilter *
263 _dbus_message_filter_ref (DBusMessageFilter *filter)
265 _dbus_assert (filter->refcount.value > 0);
266 _dbus_atomic_inc (&filter->refcount);
272 _dbus_message_filter_unref (DBusMessageFilter *filter)
274 _dbus_assert (filter->refcount.value > 0);
276 if (_dbus_atomic_dec (&filter->refcount) == 1)
278 if (filter->free_user_data_function)
279 (* filter->free_user_data_function) (filter->user_data);
286 * Acquires the connection lock.
288 * @param connection the connection.
291 _dbus_connection_lock (DBusConnection *connection)
293 CONNECTION_LOCK (connection);
297 * Releases the connection lock.
299 * @param connection the connection.
302 _dbus_connection_unlock (DBusConnection *connection)
304 CONNECTION_UNLOCK (connection);
308 * Wakes up the main loop if it is sleeping
309 * Needed if we're e.g. queueing outgoing messages
310 * on a thread while the mainloop sleeps.
312 * @param connection the connection.
315 _dbus_connection_wakeup_mainloop (DBusConnection *connection)
317 if (connection->wakeup_main_function)
318 (*connection->wakeup_main_function) (connection->wakeup_main_data);
321 #ifdef DBUS_BUILD_TESTS
322 /* For now this function isn't used */
324 * Adds a message to the incoming message queue, returning #FALSE
325 * if there's insufficient memory to queue the message.
326 * Does not take over refcount of the message.
328 * @param connection the connection.
329 * @param message the message to queue.
330 * @returns #TRUE on success.
333 _dbus_connection_queue_received_message (DBusConnection *connection,
334 DBusMessage *message)
338 link = _dbus_list_alloc_link (message);
342 dbus_message_ref (message);
343 _dbus_connection_queue_received_message_link (connection, link);
350 * Adds a message-containing list link to the incoming message queue,
351 * taking ownership of the link and the message's current refcount.
352 * Cannot fail due to lack of memory.
354 * @param connection the connection.
355 * @param link the message link to queue.
358 _dbus_connection_queue_received_message_link (DBusConnection *connection,
361 DBusPendingCall *pending;
362 dbus_int32_t reply_serial;
363 DBusMessage *message;
365 _dbus_assert (_dbus_transport_get_is_authenticated (connection->transport));
367 _dbus_list_append_link (&connection->incoming_messages,
369 message = link->data;
371 /* If this is a reply we're waiting on, remove timeout for it */
372 reply_serial = dbus_message_get_reply_serial (message);
373 if (reply_serial != -1)
375 pending = _dbus_hash_table_lookup_int (connection->pending_replies,
379 if (pending->timeout_added)
380 _dbus_connection_remove_timeout_unlocked (connection,
383 pending->timeout_added = FALSE;
387 connection->n_incoming += 1;
389 _dbus_connection_wakeup_mainloop (connection);
391 _dbus_verbose ("Message %p (%d %s %s %s '%s' reply to %u) added to incoming queue %p, %d incoming\n",
393 dbus_message_get_type (message),
394 dbus_message_get_path (message) ?
395 dbus_message_get_path (message) :
397 dbus_message_get_interface (message) ?
398 dbus_message_get_interface (message) :
400 dbus_message_get_member (message) ?
401 dbus_message_get_member (message) :
403 dbus_message_get_signature (message),
404 dbus_message_get_reply_serial (message),
406 connection->n_incoming);
410 * Adds a link + message to the incoming message queue.
411 * Can't fail. Takes ownership of both link and message.
413 * @param connection the connection.
414 * @param link the list node and message to queue.
416 * @todo This needs to wake up the mainloop if it is in
417 * a poll/select and this is a multithreaded app.
420 _dbus_connection_queue_synthesized_message_link (DBusConnection *connection,
423 HAVE_LOCK_CHECK (connection);
425 _dbus_list_append_link (&connection->incoming_messages, link);
427 connection->n_incoming += 1;
429 _dbus_connection_wakeup_mainloop (connection);
431 _dbus_verbose ("Synthesized message %p added to incoming queue %p, %d incoming\n",
432 link->data, connection, connection->n_incoming);
437 * Checks whether there are messages in the outgoing message queue.
438 * Called with connection lock held.
440 * @param connection the connection.
441 * @returns #TRUE if the outgoing queue is non-empty.
444 _dbus_connection_has_messages_to_send_unlocked (DBusConnection *connection)
446 HAVE_LOCK_CHECK (connection);
447 return connection->outgoing_messages != NULL;
451 * Checks whether there are messages in the outgoing message queue.
453 * @param connection the connection.
454 * @returns #TRUE if the outgoing queue is non-empty.
457 dbus_connection_has_messages_to_send (DBusConnection *connection)
461 _dbus_return_val_if_fail (connection != NULL, FALSE);
463 CONNECTION_LOCK (connection);
464 v = _dbus_connection_has_messages_to_send_unlocked (connection);
465 CONNECTION_UNLOCK (connection);
471 * Gets the next outgoing message. The message remains in the
472 * queue, and the caller does not own a reference to it.
474 * @param connection the connection.
475 * @returns the message to be sent.
478 _dbus_connection_get_message_to_send (DBusConnection *connection)
480 HAVE_LOCK_CHECK (connection);
482 return _dbus_list_get_last (&connection->outgoing_messages);
486 * Notifies the connection that a message has been sent, so the
487 * message can be removed from the outgoing queue.
488 * Called with the connection lock held.
490 * @param connection the connection.
491 * @param message the message that was sent.
494 _dbus_connection_message_sent (DBusConnection *connection,
495 DBusMessage *message)
499 HAVE_LOCK_CHECK (connection);
501 /* This can be called before we even complete authentication, since
502 * it's called on disconnect to clean up the outgoing queue.
503 * It's also called as we successfully send each message.
506 link = _dbus_list_get_last_link (&connection->outgoing_messages);
507 _dbus_assert (link != NULL);
508 _dbus_assert (link->data == message);
510 /* Save this link in the link cache */
511 _dbus_list_unlink (&connection->outgoing_messages,
513 _dbus_list_prepend_link (&connection->link_cache, link);
515 connection->n_outgoing -= 1;
517 _dbus_verbose ("Message %p (%d %s %s %s '%s') removed from outgoing queue %p, %d left to send\n",
519 dbus_message_get_type (message),
520 dbus_message_get_path (message) ?
521 dbus_message_get_path (message) :
523 dbus_message_get_interface (message) ?
524 dbus_message_get_interface (message) :
526 dbus_message_get_member (message) ?
527 dbus_message_get_member (message) :
529 dbus_message_get_signature (message),
530 connection, connection->n_outgoing);
532 /* Save this link in the link cache also */
533 _dbus_message_remove_size_counter (message, connection->outgoing_counter,
535 _dbus_list_prepend_link (&connection->link_cache, link);
537 dbus_message_unref (message);
540 typedef dbus_bool_t (* DBusWatchAddFunction) (DBusWatchList *list,
542 typedef void (* DBusWatchRemoveFunction) (DBusWatchList *list,
544 typedef void (* DBusWatchToggleFunction) (DBusWatchList *list,
546 dbus_bool_t enabled);
549 protected_change_watch (DBusConnection *connection,
551 DBusWatchAddFunction add_function,
552 DBusWatchRemoveFunction remove_function,
553 DBusWatchToggleFunction toggle_function,
556 DBusWatchList *watches;
559 HAVE_LOCK_CHECK (connection);
561 /* This isn't really safe or reasonable; a better pattern is the "do everything, then
562 * drop lock and call out" one; but it has to be propagated up through all callers
565 watches = connection->watches;
568 connection->watches = NULL;
569 _dbus_connection_ref_unlocked (connection);
570 CONNECTION_UNLOCK (connection);
573 retval = (* add_function) (watches, watch);
574 else if (remove_function)
577 (* remove_function) (watches, watch);
582 (* toggle_function) (watches, watch, enabled);
585 CONNECTION_LOCK (connection);
586 connection->watches = watches;
587 _dbus_connection_unref_unlocked (connection);
597 * Adds a watch using the connection's DBusAddWatchFunction if
598 * available. Otherwise records the watch to be added when said
599 * function is available. Also re-adds the watch if the
600 * DBusAddWatchFunction changes. May fail due to lack of memory.
601 * Connection lock should be held when calling this.
603 * @param connection the connection.
604 * @param watch the watch to add.
605 * @returns #TRUE on success.
608 _dbus_connection_add_watch_unlocked (DBusConnection *connection,
611 return protected_change_watch (connection, watch,
612 _dbus_watch_list_add_watch,
617 * Removes a watch using the connection's DBusRemoveWatchFunction
618 * if available. It's an error to call this function on a watch
619 * that was not previously added.
620 * Connection lock should be held when calling this.
622 * @param connection the connection.
623 * @param watch the watch to remove.
626 _dbus_connection_remove_watch_unlocked (DBusConnection *connection,
629 protected_change_watch (connection, watch,
631 _dbus_watch_list_remove_watch,
636 * Toggles a watch and notifies app via connection's
637 * DBusWatchToggledFunction if available. It's an error to call this
638 * function on a watch that was not previously added.
639 * Connection lock should be held when calling this.
641 * @param connection the connection.
642 * @param watch the watch to toggle.
643 * @param enabled whether to enable or disable
646 _dbus_connection_toggle_watch_unlocked (DBusConnection *connection,
650 _dbus_assert (watch != NULL);
652 protected_change_watch (connection, watch,
654 _dbus_watch_list_toggle_watch,
658 typedef dbus_bool_t (* DBusTimeoutAddFunction) (DBusTimeoutList *list,
659 DBusTimeout *timeout);
660 typedef void (* DBusTimeoutRemoveFunction) (DBusTimeoutList *list,
661 DBusTimeout *timeout);
662 typedef void (* DBusTimeoutToggleFunction) (DBusTimeoutList *list,
663 DBusTimeout *timeout,
664 dbus_bool_t enabled);
667 protected_change_timeout (DBusConnection *connection,
668 DBusTimeout *timeout,
669 DBusTimeoutAddFunction add_function,
670 DBusTimeoutRemoveFunction remove_function,
671 DBusTimeoutToggleFunction toggle_function,
674 DBusTimeoutList *timeouts;
677 HAVE_LOCK_CHECK (connection);
679 /* This isn't really safe or reasonable; a better pattern is the "do everything, then
680 * drop lock and call out" one; but it has to be propagated up through all callers
683 timeouts = connection->timeouts;
686 connection->timeouts = NULL;
687 _dbus_connection_ref_unlocked (connection);
688 CONNECTION_UNLOCK (connection);
691 retval = (* add_function) (timeouts, timeout);
692 else if (remove_function)
695 (* remove_function) (timeouts, timeout);
700 (* toggle_function) (timeouts, timeout, enabled);
703 CONNECTION_LOCK (connection);
704 connection->timeouts = timeouts;
705 _dbus_connection_unref_unlocked (connection);
714 * Adds a timeout using the connection's DBusAddTimeoutFunction if
715 * available. Otherwise records the timeout to be added when said
716 * function is available. Also re-adds the timeout if the
717 * DBusAddTimeoutFunction changes. May fail due to lack of memory.
718 * The timeout will fire repeatedly until removed.
719 * Connection lock should be held when calling this.
721 * @param connection the connection.
722 * @param timeout the timeout to add.
723 * @returns #TRUE on success.
726 _dbus_connection_add_timeout_unlocked (DBusConnection *connection,
727 DBusTimeout *timeout)
729 return protected_change_timeout (connection, timeout,
730 _dbus_timeout_list_add_timeout,
735 * Removes a timeout using the connection's DBusRemoveTimeoutFunction
736 * if available. It's an error to call this function on a timeout
737 * that was not previously added.
738 * Connection lock should be held when calling this.
740 * @param connection the connection.
741 * @param timeout the timeout to remove.
744 _dbus_connection_remove_timeout_unlocked (DBusConnection *connection,
745 DBusTimeout *timeout)
747 protected_change_timeout (connection, timeout,
749 _dbus_timeout_list_remove_timeout,
754 * Toggles a timeout and notifies app via connection's
755 * DBusTimeoutToggledFunction if available. It's an error to call this
756 * function on a timeout that was not previously added.
757 * Connection lock should be held when calling this.
759 * @param connection the connection.
760 * @param timeout the timeout to toggle.
761 * @param enabled whether to enable or disable
764 _dbus_connection_toggle_timeout_unlocked (DBusConnection *connection,
765 DBusTimeout *timeout,
768 protected_change_timeout (connection, timeout,
770 _dbus_timeout_list_toggle_timeout,
775 _dbus_connection_attach_pending_call_unlocked (DBusConnection *connection,
776 DBusPendingCall *pending)
778 HAVE_LOCK_CHECK (connection);
780 _dbus_assert (pending->reply_serial != 0);
782 if (!_dbus_connection_add_timeout_unlocked (connection, pending->timeout))
785 if (!_dbus_hash_table_insert_int (connection->pending_replies,
786 pending->reply_serial,
789 _dbus_connection_remove_timeout_unlocked (connection, pending->timeout);
791 HAVE_LOCK_CHECK (connection);
795 pending->timeout_added = TRUE;
796 pending->connection = connection;
798 dbus_pending_call_ref (pending);
800 HAVE_LOCK_CHECK (connection);
806 free_pending_call_on_hash_removal (void *data)
808 DBusPendingCall *pending;
815 if (pending->connection)
817 if (pending->timeout_added)
819 _dbus_connection_remove_timeout_unlocked (pending->connection,
821 pending->timeout_added = FALSE;
824 pending->connection = NULL;
826 dbus_pending_call_unref (pending);
831 _dbus_connection_detach_pending_call_unlocked (DBusConnection *connection,
832 DBusPendingCall *pending)
834 /* Can't have a destroy notifier on the pending call if we're going to do this */
836 dbus_pending_call_ref (pending);
837 _dbus_hash_table_remove_int (connection->pending_replies,
838 pending->reply_serial);
839 _dbus_assert (pending->connection == NULL);
840 dbus_pending_call_unref (pending);
844 _dbus_connection_detach_pending_call_and_unlock (DBusConnection *connection,
845 DBusPendingCall *pending)
847 /* The idea here is to avoid finalizing the pending call
848 * with the lock held, since there's a destroy notifier
849 * in pending call that goes out to application code.
851 dbus_pending_call_ref (pending);
852 _dbus_hash_table_remove_int (connection->pending_replies,
853 pending->reply_serial);
854 _dbus_assert (pending->connection == NULL);
855 CONNECTION_UNLOCK (connection);
856 dbus_pending_call_unref (pending);
860 * Removes a pending call from the connection, such that
861 * the pending reply will be ignored. May drop the last
862 * reference to the pending call.
864 * @param connection the connection
865 * @param pending the pending call
868 _dbus_connection_remove_pending_call (DBusConnection *connection,
869 DBusPendingCall *pending)
871 CONNECTION_LOCK (connection);
872 _dbus_connection_detach_pending_call_and_unlock (connection, pending);
876 * Completes a pending call with the given message,
877 * or if the message is #NULL, by timing out the pending call.
879 * @param pending the pending call
880 * @param message the message to complete the call with, or #NULL
881 * to time out the call
884 _dbus_pending_call_complete_and_unlock (DBusPendingCall *pending,
885 DBusMessage *message)
889 message = pending->timeout_link->data;
890 _dbus_list_clear (&pending->timeout_link);
893 dbus_message_ref (message);
895 _dbus_verbose (" handing message %p (%s) to pending call serial %u\n",
897 dbus_message_get_type (message) == DBUS_MESSAGE_TYPE_METHOD_RETURN ?
899 dbus_message_get_type (message) == DBUS_MESSAGE_TYPE_ERROR ?
900 "error" : "other type",
901 pending->reply_serial);
903 _dbus_assert (pending->reply == NULL);
904 _dbus_assert (pending->reply_serial == dbus_message_get_reply_serial (message));
905 pending->reply = message;
907 dbus_pending_call_ref (pending); /* in case there's no app with a ref held */
908 _dbus_connection_detach_pending_call_and_unlock (pending->connection, pending);
910 /* Must be called unlocked since it invokes app callback */
911 _dbus_pending_call_notify (pending);
912 dbus_pending_call_unref (pending);
916 * Acquire the transporter I/O path. This must be done before
917 * doing any I/O in the transporter. May sleep and drop the
918 * IO path mutex while waiting for the I/O path.
920 * @param connection the connection.
921 * @param timeout_milliseconds maximum blocking time, or -1 for no limit.
922 * @returns TRUE if the I/O path was acquired.
925 _dbus_connection_acquire_io_path (DBusConnection *connection,
926 int timeout_milliseconds)
928 dbus_bool_t we_acquired;
930 HAVE_LOCK_CHECK (connection);
932 /* We don't want the connection to vanish */
933 _dbus_connection_ref_unlocked (connection);
935 /* We will only touch io_path_acquired which is protected by our mutex */
936 CONNECTION_UNLOCK (connection);
938 _dbus_verbose ("%s locking io_path_mutex\n", _DBUS_FUNCTION_NAME);
939 _dbus_mutex_lock (connection->io_path_mutex);
941 _dbus_verbose ("%s start connection->io_path_acquired = %d timeout = %d\n",
942 _DBUS_FUNCTION_NAME, connection->io_path_acquired, timeout_milliseconds);
946 if (connection->io_path_acquired)
948 if (timeout_milliseconds != -1)
950 _dbus_verbose ("%s waiting %d for IO path to be acquirable\n",
951 _DBUS_FUNCTION_NAME, timeout_milliseconds);
952 _dbus_condvar_wait_timeout (connection->io_path_cond,
953 connection->io_path_mutex,
954 timeout_milliseconds);
958 while (connection->io_path_acquired)
960 _dbus_verbose ("%s waiting for IO path to be acquirable\n", _DBUS_FUNCTION_NAME);
961 _dbus_condvar_wait (connection->io_path_cond, connection->io_path_mutex);
966 if (!connection->io_path_acquired)
969 connection->io_path_acquired = TRUE;
972 _dbus_verbose ("%s end connection->io_path_acquired = %d we_acquired = %d\n",
973 _DBUS_FUNCTION_NAME, connection->io_path_acquired, we_acquired);
975 _dbus_verbose ("%s unlocking io_path_mutex\n", _DBUS_FUNCTION_NAME);
976 _dbus_mutex_unlock (connection->io_path_mutex);
978 CONNECTION_LOCK (connection);
980 HAVE_LOCK_CHECK (connection);
982 _dbus_connection_unref_unlocked (connection);
988 * Release the I/O path when you're done with it. Only call
989 * after you've acquired the I/O. Wakes up at most one thread
990 * currently waiting to acquire the I/O path.
992 * @param connection the connection.
995 _dbus_connection_release_io_path (DBusConnection *connection)
997 HAVE_LOCK_CHECK (connection);
999 _dbus_verbose ("%s locking io_path_mutex\n", _DBUS_FUNCTION_NAME);
1000 _dbus_mutex_lock (connection->io_path_mutex);
1002 _dbus_assert (connection->io_path_acquired);
1004 _dbus_verbose ("%s start connection->io_path_acquired = %d\n",
1005 _DBUS_FUNCTION_NAME, connection->io_path_acquired);
1007 connection->io_path_acquired = FALSE;
1008 _dbus_condvar_wake_one (connection->io_path_cond);
1010 _dbus_verbose ("%s unlocking io_path_mutex\n", _DBUS_FUNCTION_NAME);
1011 _dbus_mutex_unlock (connection->io_path_mutex);
1015 * Queues incoming messages and sends outgoing messages for this
1016 * connection, optionally blocking in the process. Each call to
1017 * _dbus_connection_do_iteration_unlocked() will call select() or poll() one
1018 * time and then read or write data if possible.
1020 * The purpose of this function is to be able to flush outgoing
1021 * messages or queue up incoming messages without returning
1022 * control to the application and causing reentrancy weirdness.
1024 * The flags parameter allows you to specify whether to
1025 * read incoming messages, write outgoing messages, or both,
1026 * and whether to block if no immediate action is possible.
1028 * The timeout_milliseconds parameter does nothing unless the
1029 * iteration is blocking.
1031 * If there are no outgoing messages and DBUS_ITERATION_DO_READING
1032 * wasn't specified, then it's impossible to block, even if
1033 * you specify DBUS_ITERATION_BLOCK; in that case the function
1034 * returns immediately.
1036 * Called with connection lock held.
1038 * @param connection the connection.
1039 * @param flags iteration flags.
1040 * @param timeout_milliseconds maximum blocking time, or -1 for no limit.
1043 _dbus_connection_do_iteration_unlocked (DBusConnection *connection,
1045 int timeout_milliseconds)
1047 _dbus_verbose ("%s start\n", _DBUS_FUNCTION_NAME);
1049 HAVE_LOCK_CHECK (connection);
1051 if (connection->n_outgoing == 0)
1052 flags &= ~DBUS_ITERATION_DO_WRITING;
1054 if (_dbus_connection_acquire_io_path (connection,
1055 (flags & DBUS_ITERATION_BLOCK) ? timeout_milliseconds : 0))
1057 HAVE_LOCK_CHECK (connection);
1059 _dbus_transport_do_iteration (connection->transport,
1060 flags, timeout_milliseconds);
1061 _dbus_connection_release_io_path (connection);
1064 HAVE_LOCK_CHECK (connection);
1066 _dbus_verbose ("%s end\n", _DBUS_FUNCTION_NAME);
1070 * Creates a new connection for the given transport. A transport
1071 * represents a message stream that uses some concrete mechanism, such
1072 * as UNIX domain sockets. May return #NULL if insufficient
1073 * memory exists to create the connection.
1075 * @param transport the transport.
1076 * @returns the new connection, or #NULL on failure.
1079 _dbus_connection_new_for_transport (DBusTransport *transport)
1081 DBusConnection *connection;
1082 DBusWatchList *watch_list;
1083 DBusTimeoutList *timeout_list;
1084 DBusHashTable *pending_replies;
1086 DBusMutex *io_path_mutex;
1087 DBusMutex *dispatch_mutex;
1088 DBusCondVar *dispatch_cond;
1089 DBusCondVar *io_path_cond;
1090 DBusList *disconnect_link;
1091 DBusMessage *disconnect_message;
1092 DBusCounter *outgoing_counter;
1093 DBusObjectTree *objects;
1097 pending_replies = NULL;
1098 timeout_list = NULL;
1100 io_path_mutex = NULL;
1101 dispatch_mutex = NULL;
1102 dispatch_cond = NULL;
1103 io_path_cond = NULL;
1104 disconnect_link = NULL;
1105 disconnect_message = NULL;
1106 outgoing_counter = NULL;
1109 watch_list = _dbus_watch_list_new ();
1110 if (watch_list == NULL)
1113 timeout_list = _dbus_timeout_list_new ();
1114 if (timeout_list == NULL)
1118 _dbus_hash_table_new (DBUS_HASH_INT,
1120 (DBusFreeFunction)free_pending_call_on_hash_removal);
1121 if (pending_replies == NULL)
1124 connection = dbus_new0 (DBusConnection, 1);
1125 if (connection == NULL)
1128 mutex = _dbus_mutex_new ();
1132 io_path_mutex = _dbus_mutex_new ();
1133 if (io_path_mutex == NULL)
1136 dispatch_mutex = _dbus_mutex_new ();
1137 if (dispatch_mutex == NULL)
1140 dispatch_cond = _dbus_condvar_new ();
1141 if (dispatch_cond == NULL)
1144 io_path_cond = _dbus_condvar_new ();
1145 if (io_path_cond == NULL)
1148 disconnect_message = dbus_message_new_signal (DBUS_PATH_LOCAL,
1149 DBUS_INTERFACE_LOCAL,
1152 if (disconnect_message == NULL)
1155 disconnect_link = _dbus_list_alloc_link (disconnect_message);
1156 if (disconnect_link == NULL)
1159 outgoing_counter = _dbus_counter_new ();
1160 if (outgoing_counter == NULL)
1163 objects = _dbus_object_tree_new (connection);
1164 if (objects == NULL)
1167 if (_dbus_modify_sigpipe)
1168 _dbus_disable_sigpipe ();
1170 connection->refcount.value = 1;
1171 connection->mutex = mutex;
1172 connection->dispatch_cond = dispatch_cond;
1173 connection->dispatch_mutex = dispatch_mutex;
1174 connection->io_path_cond = io_path_cond;
1175 connection->io_path_mutex = io_path_mutex;
1176 connection->transport = transport;
1177 connection->watches = watch_list;
1178 connection->timeouts = timeout_list;
1179 connection->pending_replies = pending_replies;
1180 connection->outgoing_counter = outgoing_counter;
1181 connection->filter_list = NULL;
1182 connection->last_dispatch_status = DBUS_DISPATCH_COMPLETE; /* so we're notified first time there's data */
1183 connection->objects = objects;
1184 connection->exit_on_disconnect = FALSE;
1185 connection->shareable = FALSE;
1186 #ifndef DBUS_DISABLE_CHECKS
1187 connection->generation = _dbus_current_generation;
1190 _dbus_data_slot_list_init (&connection->slot_list);
1192 connection->client_serial = 1;
1194 connection->disconnect_message_link = disconnect_link;
1196 CONNECTION_LOCK (connection);
1198 if (!_dbus_transport_set_connection (transport, connection))
1201 _dbus_transport_ref (transport);
1203 CONNECTION_UNLOCK (connection);
1208 if (disconnect_message != NULL)
1209 dbus_message_unref (disconnect_message);
1211 if (disconnect_link != NULL)
1212 _dbus_list_free_link (disconnect_link);
1214 if (io_path_cond != NULL)
1215 _dbus_condvar_free (io_path_cond);
1217 if (dispatch_cond != NULL)
1218 _dbus_condvar_free (dispatch_cond);
1221 _dbus_mutex_free (mutex);
1223 if (io_path_mutex != NULL)
1224 _dbus_mutex_free (io_path_mutex);
1226 if (dispatch_mutex != NULL)
1227 _dbus_mutex_free (dispatch_mutex);
1229 if (connection != NULL)
1230 dbus_free (connection);
1232 if (pending_replies)
1233 _dbus_hash_table_unref (pending_replies);
1236 _dbus_watch_list_free (watch_list);
1239 _dbus_timeout_list_free (timeout_list);
1241 if (outgoing_counter)
1242 _dbus_counter_unref (outgoing_counter);
1245 _dbus_object_tree_unref (objects);
1251 * Increments the reference count of a DBusConnection.
1252 * Requires that the caller already holds the connection lock.
1254 * @param connection the connection.
1255 * @returns the connection.
1258 _dbus_connection_ref_unlocked (DBusConnection *connection)
1260 _dbus_assert (connection != NULL);
1261 _dbus_assert (connection->generation == _dbus_current_generation);
1263 HAVE_LOCK_CHECK (connection);
1265 #ifdef DBUS_HAVE_ATOMIC_INT
1266 _dbus_atomic_inc (&connection->refcount);
1268 _dbus_assert (connection->refcount.value > 0);
1269 connection->refcount.value += 1;
1276 * Decrements the reference count of a DBusConnection.
1277 * Requires that the caller already holds the connection lock.
1279 * @param connection the connection.
1282 _dbus_connection_unref_unlocked (DBusConnection *connection)
1284 dbus_bool_t last_unref;
1286 HAVE_LOCK_CHECK (connection);
1288 _dbus_assert (connection != NULL);
1290 /* The connection lock is better than the global
1291 * lock in the atomic increment fallback
1294 #ifdef DBUS_HAVE_ATOMIC_INT
1295 last_unref = (_dbus_atomic_dec (&connection->refcount) == 1);
1297 _dbus_assert (connection->refcount.value > 0);
1299 connection->refcount.value -= 1;
1300 last_unref = (connection->refcount.value == 0);
1302 printf ("unref_unlocked() connection %p count = %d\n", connection, connection->refcount.value);
1307 _dbus_connection_last_unref (connection);
1310 static dbus_uint32_t
1311 _dbus_connection_get_next_client_serial (DBusConnection *connection)
1315 serial = connection->client_serial++;
1317 if (connection->client_serial < 0)
1318 connection->client_serial = 1;
1324 * A callback for use with dbus_watch_new() to create a DBusWatch.
1326 * @todo This is basically a hack - we could delete _dbus_transport_handle_watch()
1327 * and the virtual handle_watch in DBusTransport if we got rid of it.
1328 * The reason this is some work is threading, see the _dbus_connection_handle_watch()
1331 * @param watch the watch.
1332 * @param condition the current condition of the file descriptors being watched.
1333 * @param data must be a pointer to a #DBusConnection
1334 * @returns #FALSE if the IO condition may not have been fully handled due to lack of memory
1337 _dbus_connection_handle_watch (DBusWatch *watch,
1338 unsigned int condition,
1341 DBusConnection *connection;
1343 DBusDispatchStatus status;
1347 _dbus_verbose ("%s start\n", _DBUS_FUNCTION_NAME);
1349 CONNECTION_LOCK (connection);
1350 _dbus_connection_acquire_io_path (connection, -1);
1351 HAVE_LOCK_CHECK (connection);
1352 retval = _dbus_transport_handle_watch (connection->transport,
1355 _dbus_connection_release_io_path (connection);
1357 HAVE_LOCK_CHECK (connection);
1359 _dbus_verbose ("%s middle\n", _DBUS_FUNCTION_NAME);
1361 status = _dbus_connection_get_dispatch_status_unlocked (connection);
1363 /* this calls out to user code */
1364 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
1366 _dbus_verbose ("%s end\n", _DBUS_FUNCTION_NAME);
1371 _DBUS_DEFINE_GLOBAL_LOCK (shared_connections);
1372 static DBusHashTable *shared_connections = NULL;
1375 shared_connections_shutdown (void *data)
1377 _DBUS_LOCK (shared_connections);
1379 _dbus_assert (_dbus_hash_table_get_n_entries (shared_connections) == 0);
1380 _dbus_hash_table_unref (shared_connections);
1381 shared_connections = NULL;
1383 _DBUS_UNLOCK (shared_connections);
1387 connection_lookup_shared (DBusAddressEntry *entry,
1388 DBusConnection **result)
1390 _dbus_verbose ("checking for existing connection\n");
1394 _DBUS_LOCK (shared_connections);
1396 if (shared_connections == NULL)
1398 _dbus_verbose ("creating shared_connections hash table\n");
1400 shared_connections = _dbus_hash_table_new (DBUS_HASH_STRING,
1403 if (shared_connections == NULL)
1405 _DBUS_UNLOCK (shared_connections);
1409 if (!_dbus_register_shutdown_func (shared_connections_shutdown, NULL))
1411 _dbus_hash_table_unref (shared_connections);
1412 shared_connections = NULL;
1413 _DBUS_UNLOCK (shared_connections);
1417 _dbus_verbose (" successfully created shared_connections\n");
1419 _DBUS_UNLOCK (shared_connections);
1420 return TRUE; /* no point looking up in the hash we just made */
1426 guid = dbus_address_entry_get_value (entry, "guid");
1430 *result = _dbus_hash_table_lookup_string (shared_connections,
1435 /* The DBusConnection can't have been disconnected
1436 * between the lookup and this code, because the
1437 * disconnection will take the shared_connections lock to
1438 * remove the connection. It can't have been finalized
1439 * since you have to disconnect prior to finalize.
1441 * Thus it's safe to ref the connection.
1443 dbus_connection_ref (*result);
1445 _dbus_verbose ("looked up existing connection to server guid %s\n",
1450 _DBUS_UNLOCK (shared_connections);
1456 connection_record_shared_unlocked (DBusConnection *connection,
1460 char *guid_in_connection;
1462 /* A separate copy of the key is required in the hash table, because
1463 * we don't have a lock on the connection when we are doing a hash
1467 _dbus_assert (connection->server_guid == NULL);
1468 _dbus_assert (connection->shareable);
1470 guid_key = _dbus_strdup (guid);
1471 if (guid_key == NULL)
1474 guid_in_connection = _dbus_strdup (guid);
1475 if (guid_in_connection == NULL)
1477 dbus_free (guid_key);
1481 _DBUS_LOCK (shared_connections);
1482 _dbus_assert (shared_connections != NULL);
1484 if (!_dbus_hash_table_insert_string (shared_connections,
1485 guid_key, connection))
1487 dbus_free (guid_key);
1488 dbus_free (guid_in_connection);
1489 _DBUS_UNLOCK (shared_connections);
1493 connection->server_guid = guid_in_connection;
1495 _dbus_verbose ("stored connection to %s to be shared\n",
1496 connection->server_guid);
1498 _DBUS_UNLOCK (shared_connections);
1500 _dbus_assert (connection->server_guid != NULL);
1506 connection_forget_shared_unlocked (DBusConnection *connection)
1508 HAVE_LOCK_CHECK (connection);
1510 if (connection->server_guid == NULL)
1513 _dbus_verbose ("dropping connection to %s out of the shared table\n",
1514 connection->server_guid);
1516 _DBUS_LOCK (shared_connections);
1518 if (!_dbus_hash_table_remove_string (shared_connections,
1519 connection->server_guid))
1520 _dbus_assert_not_reached ("connection was not in the shared table");
1522 dbus_free (connection->server_guid);
1523 connection->server_guid = NULL;
1525 _DBUS_UNLOCK (shared_connections);
1528 static DBusConnection*
1529 connection_try_from_address_entry (DBusAddressEntry *entry,
1532 DBusTransport *transport;
1533 DBusConnection *connection;
1535 transport = _dbus_transport_open (entry, error);
1537 if (transport == NULL)
1539 _DBUS_ASSERT_ERROR_IS_SET (error);
1543 connection = _dbus_connection_new_for_transport (transport);
1545 _dbus_transport_unref (transport);
1547 if (connection == NULL)
1549 _DBUS_SET_OOM (error);
1553 #ifndef DBUS_DISABLE_CHECKS
1554 _dbus_assert (!connection->have_connection_lock);
1560 * If the shared parameter is true, then any existing connection will
1561 * be used (and if a new connection is created, it will be available
1562 * for use by others). If the shared parameter is false, a new
1563 * connection will always be created, and the new connection will
1564 * never be returned to other callers.
1566 * @param address the address
1567 * @param shared whether the connection is shared or private
1568 * @param error error return
1569 * @returns the connection or #NULL on error
1571 static DBusConnection*
1572 _dbus_connection_open_internal (const char *address,
1576 DBusConnection *connection;
1577 DBusAddressEntry **entries;
1578 DBusError tmp_error;
1579 DBusError first_error;
1582 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1584 _dbus_verbose ("opening %s connection to: %s\n",
1585 shared ? "shared" : "private", address);
1587 if (!dbus_parse_address (address, &entries, &len, error))
1590 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1594 dbus_error_init (&tmp_error);
1595 dbus_error_init (&first_error);
1596 for (i = 0; i < len; i++)
1600 if (!connection_lookup_shared (entries[i], &connection))
1601 _DBUS_SET_OOM (&tmp_error);
1604 if (connection == NULL)
1606 connection = connection_try_from_address_entry (entries[i],
1609 if (connection != NULL && shared)
1613 connection->shareable = TRUE;
1615 guid = dbus_address_entry_get_value (entries[i], "guid");
1617 /* we don't have a connection lock but we know nobody
1618 * else has a handle to the connection
1622 !connection_record_shared_unlocked (connection, guid))
1624 _DBUS_SET_OOM (&tmp_error);
1625 dbus_connection_close (connection);
1626 dbus_connection_unref (connection);
1630 /* but as of now the connection is possibly shared
1631 * since another thread could have pulled it from the table
1639 _DBUS_ASSERT_ERROR_IS_SET (&tmp_error);
1642 dbus_move_error (&tmp_error, &first_error);
1644 dbus_error_free (&tmp_error);
1647 /* NOTE we don't have a lock on a possibly-shared connection object */
1649 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1650 _DBUS_ASSERT_ERROR_IS_CLEAR (&tmp_error);
1652 if (connection == NULL)
1654 _DBUS_ASSERT_ERROR_IS_SET (&first_error);
1655 dbus_move_error (&first_error, error);
1659 dbus_error_free (&first_error);
1662 dbus_address_entries_free (entries);
1669 * @addtogroup DBusConnection
1675 * Gets a connection to a remote address. If a connection to the given
1676 * address already exists, returns the existing connection with its
1677 * reference count incremented. Otherwise, returns a new connection
1678 * and saves the new connection for possible re-use if a future call
1679 * to dbus_connection_open() asks to connect to the same server.
1681 * Use dbus_connection_open_private() to get a dedicated connection
1682 * not shared with other callers of dbus_connection_open().
1684 * If the open fails, the function returns #NULL, and provides a
1685 * reason for the failure in the error parameter. Pass #NULL for the
1686 * error parameter if you aren't interested in the reason for
1689 * @param address the address.
1690 * @param error address where an error can be returned.
1691 * @returns new connection, or #NULL on failure.
1694 dbus_connection_open (const char *address,
1697 DBusConnection *connection;
1699 _dbus_return_val_if_fail (address != NULL, NULL);
1700 _dbus_return_val_if_error_is_set (error, NULL);
1702 connection = _dbus_connection_open_internal (address,
1710 * Opens a new, dedicated connection to a remote address. Unlike
1711 * dbus_connection_open(), always creates a new connection.
1712 * This connection will not be saved or recycled by libdbus.
1714 * If the open fails, the function returns #NULL, and provides a
1715 * reason for the failure in the error parameter. Pass #NULL for the
1716 * error parameter if you aren't interested in the reason for
1719 * @param address the address.
1720 * @param error address where an error can be returned.
1721 * @returns new connection, or #NULL on failure.
1724 dbus_connection_open_private (const char *address,
1727 DBusConnection *connection;
1729 _dbus_return_val_if_fail (address != NULL, NULL);
1730 _dbus_return_val_if_error_is_set (error, NULL);
1732 connection = _dbus_connection_open_internal (address,
1740 * Increments the reference count of a DBusConnection.
1742 * @param connection the connection.
1743 * @returns the connection.
1746 dbus_connection_ref (DBusConnection *connection)
1748 _dbus_return_val_if_fail (connection != NULL, NULL);
1749 _dbus_return_val_if_fail (connection->generation == _dbus_current_generation, NULL);
1751 /* The connection lock is better than the global
1752 * lock in the atomic increment fallback
1755 #ifdef DBUS_HAVE_ATOMIC_INT
1756 _dbus_atomic_inc (&connection->refcount);
1758 CONNECTION_LOCK (connection);
1759 _dbus_assert (connection->refcount.value > 0);
1761 connection->refcount.value += 1;
1762 CONNECTION_UNLOCK (connection);
1769 free_outgoing_message (void *element,
1772 DBusMessage *message = element;
1773 DBusConnection *connection = data;
1775 _dbus_message_remove_size_counter (message,
1776 connection->outgoing_counter,
1778 dbus_message_unref (message);
1781 /* This is run without the mutex held, but after the last reference
1782 * to the connection has been dropped we should have no thread-related
1786 _dbus_connection_last_unref (DBusConnection *connection)
1790 _dbus_verbose ("Finalizing connection %p\n", connection);
1792 _dbus_assert (connection->refcount.value == 0);
1794 /* You have to disconnect the connection before unref:ing it. Otherwise
1795 * you won't get the disconnected message.
1797 _dbus_assert (!_dbus_transport_get_is_connected (connection->transport));
1798 _dbus_assert (connection->server_guid == NULL);
1800 /* ---- We're going to call various application callbacks here, hope it doesn't break anything... */
1801 _dbus_object_tree_free_all_unlocked (connection->objects);
1803 dbus_connection_set_dispatch_status_function (connection, NULL, NULL, NULL);
1804 dbus_connection_set_wakeup_main_function (connection, NULL, NULL, NULL);
1805 dbus_connection_set_unix_user_function (connection, NULL, NULL, NULL);
1807 _dbus_watch_list_free (connection->watches);
1808 connection->watches = NULL;
1810 _dbus_timeout_list_free (connection->timeouts);
1811 connection->timeouts = NULL;
1813 _dbus_data_slot_list_free (&connection->slot_list);
1815 link = _dbus_list_get_first_link (&connection->filter_list);
1816 while (link != NULL)
1818 DBusMessageFilter *filter = link->data;
1819 DBusList *next = _dbus_list_get_next_link (&connection->filter_list, link);
1821 filter->function = NULL;
1822 _dbus_message_filter_unref (filter); /* calls app callback */
1827 _dbus_list_clear (&connection->filter_list);
1829 /* ---- Done with stuff that invokes application callbacks */
1831 _dbus_object_tree_unref (connection->objects);
1833 _dbus_hash_table_unref (connection->pending_replies);
1834 connection->pending_replies = NULL;
1836 _dbus_list_clear (&connection->filter_list);
1838 _dbus_list_foreach (&connection->outgoing_messages,
1839 free_outgoing_message,
1841 _dbus_list_clear (&connection->outgoing_messages);
1843 _dbus_list_foreach (&connection->incoming_messages,
1844 (DBusForeachFunction) dbus_message_unref,
1846 _dbus_list_clear (&connection->incoming_messages);
1848 _dbus_counter_unref (connection->outgoing_counter);
1850 _dbus_transport_unref (connection->transport);
1852 if (connection->disconnect_message_link)
1854 DBusMessage *message = connection->disconnect_message_link->data;
1855 dbus_message_unref (message);
1856 _dbus_list_free_link (connection->disconnect_message_link);
1859 _dbus_list_clear (&connection->link_cache);
1861 _dbus_condvar_free (connection->dispatch_cond);
1862 _dbus_condvar_free (connection->io_path_cond);
1864 _dbus_mutex_free (connection->io_path_mutex);
1865 _dbus_mutex_free (connection->dispatch_mutex);
1867 _dbus_mutex_free (connection->mutex);
1869 dbus_free (connection);
1873 * Decrements the reference count of a DBusConnection, and finalizes
1874 * it if the count reaches zero. It is a bug to drop the last reference
1875 * to a connection that has not been disconnected.
1877 * @todo in practice it can be quite tricky to never unref a connection
1878 * that's still connected; maybe there's some way we could avoid
1881 * @param connection the connection.
1884 dbus_connection_unref (DBusConnection *connection)
1886 dbus_bool_t last_unref;
1888 _dbus_return_if_fail (connection != NULL);
1889 _dbus_return_if_fail (connection->generation == _dbus_current_generation);
1891 /* The connection lock is better than the global
1892 * lock in the atomic increment fallback
1895 #ifdef DBUS_HAVE_ATOMIC_INT
1896 last_unref = (_dbus_atomic_dec (&connection->refcount) == 1);
1898 CONNECTION_LOCK (connection);
1900 _dbus_assert (connection->refcount.value > 0);
1902 connection->refcount.value -= 1;
1903 last_unref = (connection->refcount.value == 0);
1906 printf ("unref() connection %p count = %d\n", connection, connection->refcount.value);
1909 CONNECTION_UNLOCK (connection);
1913 _dbus_connection_last_unref (connection);
1917 * Closes the connection, so no further data can be sent or received.
1918 * Any further attempts to send data will result in errors. This
1919 * function does not affect the connection's reference count. It's
1920 * safe to disconnect a connection more than once; all calls after the
1921 * first do nothing. It's impossible to "reopen" a connection, a
1922 * new connection must be created. This function may result in a call
1923 * to the DBusDispatchStatusFunction set with
1924 * dbus_connection_set_dispatch_status_function(), as the disconnect
1925 * message it generates needs to be dispatched.
1927 * @param connection the connection.
1930 dbus_connection_close (DBusConnection *connection)
1932 DBusDispatchStatus status;
1934 _dbus_return_if_fail (connection != NULL);
1935 _dbus_return_if_fail (connection->generation == _dbus_current_generation);
1937 _dbus_verbose ("Disconnecting %p\n", connection);
1939 CONNECTION_LOCK (connection);
1941 _dbus_transport_disconnect (connection->transport);
1943 _dbus_verbose ("%s middle\n", _DBUS_FUNCTION_NAME);
1944 status = _dbus_connection_get_dispatch_status_unlocked (connection);
1946 /* this calls out to user code */
1947 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
1950 /** Alias for dbus_connection_close(). This method is DEPRECATED and will be
1951 * removed for 1.0. Change your code to use dbus_connection_close() instead.
1953 * @param connection the connection.
1957 dbus_connection_disconnect (DBusConnection *connection)
1959 dbus_connection_close (connection);
1963 _dbus_connection_get_is_connected_unlocked (DBusConnection *connection)
1965 HAVE_LOCK_CHECK (connection);
1966 return _dbus_transport_get_is_connected (connection->transport);
1970 * Gets whether the connection is currently connected. All
1971 * connections are connected when they are opened. A connection may
1972 * become disconnected when the remote application closes its end, or
1973 * exits; a connection may also be disconnected with
1974 * dbus_connection_close().
1976 * @param connection the connection.
1977 * @returns #TRUE if the connection is still alive.
1980 dbus_connection_get_is_connected (DBusConnection *connection)
1984 _dbus_return_val_if_fail (connection != NULL, FALSE);
1986 CONNECTION_LOCK (connection);
1987 res = _dbus_connection_get_is_connected_unlocked (connection);
1988 CONNECTION_UNLOCK (connection);
1994 * Gets whether the connection was authenticated. (Note that
1995 * if the connection was authenticated then disconnected,
1996 * this function still returns #TRUE)
1998 * @param connection the connection
1999 * @returns #TRUE if the connection was ever authenticated
2002 dbus_connection_get_is_authenticated (DBusConnection *connection)
2006 _dbus_return_val_if_fail (connection != NULL, FALSE);
2008 CONNECTION_LOCK (connection);
2009 res = _dbus_transport_get_is_authenticated (connection->transport);
2010 CONNECTION_UNLOCK (connection);
2016 * Set whether _exit() should be called when the connection receives a
2017 * disconnect signal. The call to _exit() comes after any handlers for
2018 * the disconnect signal run; handlers can cancel the exit by calling
2021 * By default, exit_on_disconnect is #FALSE; but for message bus
2022 * connections returned from dbus_bus_get() it will be toggled on
2025 * @param connection the connection
2026 * @param exit_on_disconnect #TRUE if _exit() should be called after a disconnect signal
2029 dbus_connection_set_exit_on_disconnect (DBusConnection *connection,
2030 dbus_bool_t exit_on_disconnect)
2032 _dbus_return_if_fail (connection != NULL);
2034 CONNECTION_LOCK (connection);
2035 connection->exit_on_disconnect = exit_on_disconnect != FALSE;
2036 CONNECTION_UNLOCK (connection);
2039 static DBusPreallocatedSend*
2040 _dbus_connection_preallocate_send_unlocked (DBusConnection *connection)
2042 DBusPreallocatedSend *preallocated;
2044 HAVE_LOCK_CHECK (connection);
2046 _dbus_assert (connection != NULL);
2048 preallocated = dbus_new (DBusPreallocatedSend, 1);
2049 if (preallocated == NULL)
2052 if (connection->link_cache != NULL)
2054 preallocated->queue_link =
2055 _dbus_list_pop_first_link (&connection->link_cache);
2056 preallocated->queue_link->data = NULL;
2060 preallocated->queue_link = _dbus_list_alloc_link (NULL);
2061 if (preallocated->queue_link == NULL)
2065 if (connection->link_cache != NULL)
2067 preallocated->counter_link =
2068 _dbus_list_pop_first_link (&connection->link_cache);
2069 preallocated->counter_link->data = connection->outgoing_counter;
2073 preallocated->counter_link = _dbus_list_alloc_link (connection->outgoing_counter);
2074 if (preallocated->counter_link == NULL)
2078 _dbus_counter_ref (preallocated->counter_link->data);
2080 preallocated->connection = connection;
2082 return preallocated;
2085 _dbus_list_free_link (preallocated->queue_link);
2087 dbus_free (preallocated);
2093 * Preallocates resources needed to send a message, allowing the message
2094 * to be sent without the possibility of memory allocation failure.
2095 * Allows apps to create a future guarantee that they can send
2096 * a message regardless of memory shortages.
2098 * @param connection the connection we're preallocating for.
2099 * @returns the preallocated resources, or #NULL
2101 DBusPreallocatedSend*
2102 dbus_connection_preallocate_send (DBusConnection *connection)
2104 DBusPreallocatedSend *preallocated;
2106 _dbus_return_val_if_fail (connection != NULL, NULL);
2108 CONNECTION_LOCK (connection);
2111 _dbus_connection_preallocate_send_unlocked (connection);
2113 CONNECTION_UNLOCK (connection);
2115 return preallocated;
2119 * Frees preallocated message-sending resources from
2120 * dbus_connection_preallocate_send(). Should only
2121 * be called if the preallocated resources are not used
2122 * to send a message.
2124 * @param connection the connection
2125 * @param preallocated the resources
2128 dbus_connection_free_preallocated_send (DBusConnection *connection,
2129 DBusPreallocatedSend *preallocated)
2131 _dbus_return_if_fail (connection != NULL);
2132 _dbus_return_if_fail (preallocated != NULL);
2133 _dbus_return_if_fail (connection == preallocated->connection);
2135 _dbus_list_free_link (preallocated->queue_link);
2136 _dbus_counter_unref (preallocated->counter_link->data);
2137 _dbus_list_free_link (preallocated->counter_link);
2138 dbus_free (preallocated);
2141 /* Called with lock held, does not update dispatch status */
2143 _dbus_connection_send_preallocated_unlocked_no_update (DBusConnection *connection,
2144 DBusPreallocatedSend *preallocated,
2145 DBusMessage *message,
2146 dbus_uint32_t *client_serial)
2148 dbus_uint32_t serial;
2151 preallocated->queue_link->data = message;
2152 _dbus_list_prepend_link (&connection->outgoing_messages,
2153 preallocated->queue_link);
2155 _dbus_message_add_size_counter_link (message,
2156 preallocated->counter_link);
2158 dbus_free (preallocated);
2159 preallocated = NULL;
2161 dbus_message_ref (message);
2163 connection->n_outgoing += 1;
2165 sig = dbus_message_get_signature (message);
2167 _dbus_verbose ("Message %p (%d %s %s %s '%s') for %s added to outgoing queue %p, %d pending to send\n",
2169 dbus_message_get_type (message),
2170 dbus_message_get_path (message) ?
2171 dbus_message_get_path (message) :
2173 dbus_message_get_interface (message) ?
2174 dbus_message_get_interface (message) :
2176 dbus_message_get_member (message) ?
2177 dbus_message_get_member (message) :
2180 dbus_message_get_destination (message) ?
2181 dbus_message_get_destination (message) :
2184 connection->n_outgoing);
2186 if (dbus_message_get_serial (message) == 0)
2188 serial = _dbus_connection_get_next_client_serial (connection);
2189 _dbus_message_set_serial (message, serial);
2191 *client_serial = serial;
2196 *client_serial = dbus_message_get_serial (message);
2199 _dbus_verbose ("Message %p serial is %u\n",
2200 message, dbus_message_get_serial (message));
2202 _dbus_message_lock (message);
2204 /* Now we need to run an iteration to hopefully just write the messages
2205 * out immediately, and otherwise get them queued up
2207 _dbus_connection_do_iteration_unlocked (connection,
2208 DBUS_ITERATION_DO_WRITING,
2211 /* If stuff is still queued up, be sure we wake up the main loop */
2212 if (connection->n_outgoing > 0)
2213 _dbus_connection_wakeup_mainloop (connection);
2217 _dbus_connection_send_preallocated_and_unlock (DBusConnection *connection,
2218 DBusPreallocatedSend *preallocated,
2219 DBusMessage *message,
2220 dbus_uint32_t *client_serial)
2222 DBusDispatchStatus status;
2224 HAVE_LOCK_CHECK (connection);
2226 _dbus_connection_send_preallocated_unlocked_no_update (connection,
2228 message, client_serial);
2230 _dbus_verbose ("%s middle\n", _DBUS_FUNCTION_NAME);
2231 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2233 /* this calls out to user code */
2234 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2238 * Sends a message using preallocated resources. This function cannot fail.
2239 * It works identically to dbus_connection_send() in other respects.
2240 * Preallocated resources comes from dbus_connection_preallocate_send().
2241 * This function "consumes" the preallocated resources, they need not
2242 * be freed separately.
2244 * @param connection the connection
2245 * @param preallocated the preallocated resources
2246 * @param message the message to send
2247 * @param client_serial return location for client serial assigned to the message
2250 dbus_connection_send_preallocated (DBusConnection *connection,
2251 DBusPreallocatedSend *preallocated,
2252 DBusMessage *message,
2253 dbus_uint32_t *client_serial)
2255 _dbus_return_if_fail (connection != NULL);
2256 _dbus_return_if_fail (preallocated != NULL);
2257 _dbus_return_if_fail (message != NULL);
2258 _dbus_return_if_fail (preallocated->connection == connection);
2259 _dbus_return_if_fail (dbus_message_get_type (message) != DBUS_MESSAGE_TYPE_METHOD_CALL ||
2260 (dbus_message_get_interface (message) != NULL &&
2261 dbus_message_get_member (message) != NULL));
2262 _dbus_return_if_fail (dbus_message_get_type (message) != DBUS_MESSAGE_TYPE_SIGNAL ||
2263 (dbus_message_get_interface (message) != NULL &&
2264 dbus_message_get_member (message) != NULL));
2266 CONNECTION_LOCK (connection);
2267 _dbus_connection_send_preallocated_and_unlock (connection,
2269 message, client_serial);
2273 _dbus_connection_send_unlocked_no_update (DBusConnection *connection,
2274 DBusMessage *message,
2275 dbus_uint32_t *client_serial)
2277 DBusPreallocatedSend *preallocated;
2279 _dbus_assert (connection != NULL);
2280 _dbus_assert (message != NULL);
2282 preallocated = _dbus_connection_preallocate_send_unlocked (connection);
2283 if (preallocated == NULL)
2286 _dbus_connection_send_preallocated_unlocked_no_update (connection,
2294 _dbus_connection_send_and_unlock (DBusConnection *connection,
2295 DBusMessage *message,
2296 dbus_uint32_t *client_serial)
2298 DBusPreallocatedSend *preallocated;
2300 _dbus_assert (connection != NULL);
2301 _dbus_assert (message != NULL);
2303 preallocated = _dbus_connection_preallocate_send_unlocked (connection);
2304 if (preallocated == NULL)
2306 CONNECTION_UNLOCK (connection);
2310 _dbus_connection_send_preallocated_and_unlock (connection,
2318 * Adds a message to the outgoing message queue. Does not block to
2319 * write the message to the network; that happens asynchronously. To
2320 * force the message to be written, call dbus_connection_flush().
2321 * Because this only queues the message, the only reason it can
2322 * fail is lack of memory. Even if the connection is disconnected,
2323 * no error will be returned.
2325 * If the function fails due to lack of memory, it returns #FALSE.
2326 * The function will never fail for other reasons; even if the
2327 * connection is disconnected, you can queue an outgoing message,
2328 * though obviously it won't be sent.
2330 * @param connection the connection.
2331 * @param message the message to write.
2332 * @param client_serial return location for client serial.
2333 * @returns #TRUE on success.
2336 dbus_connection_send (DBusConnection *connection,
2337 DBusMessage *message,
2338 dbus_uint32_t *client_serial)
2340 _dbus_return_val_if_fail (connection != NULL, FALSE);
2341 _dbus_return_val_if_fail (message != NULL, FALSE);
2343 CONNECTION_LOCK (connection);
2345 return _dbus_connection_send_and_unlock (connection,
2351 reply_handler_timeout (void *data)
2353 DBusConnection *connection;
2354 DBusDispatchStatus status;
2355 DBusPendingCall *pending = data;
2357 connection = pending->connection;
2359 CONNECTION_LOCK (connection);
2360 if (pending->timeout_link)
2362 _dbus_connection_queue_synthesized_message_link (connection,
2363 pending->timeout_link);
2364 pending->timeout_link = NULL;
2367 _dbus_connection_remove_timeout_unlocked (connection,
2369 pending->timeout_added = FALSE;
2371 _dbus_verbose ("%s middle\n", _DBUS_FUNCTION_NAME);
2372 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2374 /* Unlocks, and calls out to user code */
2375 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2381 * Queues a message to send, as with dbus_connection_send_message(),
2382 * but also returns a #DBusPendingCall used to receive a reply to the
2383 * message. If no reply is received in the given timeout_milliseconds,
2384 * this function expires the pending reply and generates a synthetic
2385 * error reply (generated in-process, not by the remote application)
2386 * indicating that a timeout occurred.
2388 * A #DBusPendingCall will see a reply message after any filters, but
2389 * before any object instances or other handlers. A #DBusPendingCall
2390 * will always see exactly one reply message, unless it's cancelled
2391 * with dbus_pending_call_cancel().
2393 * If a filter filters out the reply before the handler sees it, the
2394 * reply is immediately timed out and a timeout error reply is
2395 * generated. If a filter removes the timeout error reply then the
2396 * #DBusPendingCall will get confused. Filtering the timeout error
2397 * is thus considered a bug and will print a warning.
2399 * If #NULL is passed for the pending_return, the #DBusPendingCall
2400 * will still be generated internally, and used to track
2401 * the message reply timeout. This means a timeout error will
2402 * occur if no reply arrives, unlike with dbus_connection_send().
2404 * If -1 is passed for the timeout, a sane default timeout is used. -1
2405 * is typically the best value for the timeout for this reason, unless
2406 * you want a very short or very long timeout. There is no way to
2407 * avoid a timeout entirely, other than passing INT_MAX for the
2408 * timeout to postpone it indefinitely.
2410 * @param connection the connection
2411 * @param message the message to send
2412 * @param pending_return return location for a #DBusPendingCall object, or #NULL
2413 * @param timeout_milliseconds timeout in milliseconds or -1 for default
2414 * @returns #TRUE if the message is successfully queued, #FALSE if no memory.
2418 dbus_connection_send_with_reply (DBusConnection *connection,
2419 DBusMessage *message,
2420 DBusPendingCall **pending_return,
2421 int timeout_milliseconds)
2423 DBusPendingCall *pending;
2425 DBusList *reply_link;
2426 dbus_int32_t serial = -1;
2427 DBusDispatchStatus status;
2429 _dbus_return_val_if_fail (connection != NULL, FALSE);
2430 _dbus_return_val_if_fail (message != NULL, FALSE);
2431 _dbus_return_val_if_fail (timeout_milliseconds >= 0 || timeout_milliseconds == -1, FALSE);
2434 *pending_return = NULL;
2436 pending = _dbus_pending_call_new (connection,
2437 timeout_milliseconds,
2438 reply_handler_timeout);
2440 if (pending == NULL)
2443 CONNECTION_LOCK (connection);
2445 /* Assign a serial to the message */
2446 if (dbus_message_get_serial (message) == 0)
2448 serial = _dbus_connection_get_next_client_serial (connection);
2449 _dbus_message_set_serial (message, serial);
2452 pending->reply_serial = serial;
2454 reply = dbus_message_new_error (message, DBUS_ERROR_NO_REPLY,
2455 "No reply within specified time");
2459 reply_link = _dbus_list_alloc_link (reply);
2460 if (reply_link == NULL)
2462 CONNECTION_UNLOCK (connection);
2463 dbus_message_unref (reply);
2464 goto error_unlocked;
2467 pending->timeout_link = reply_link;
2469 /* Insert the serial in the pending replies hash;
2470 * hash takes a refcount on DBusPendingCall.
2471 * Also, add the timeout.
2473 if (!_dbus_connection_attach_pending_call_unlocked (connection,
2477 if (!_dbus_connection_send_unlocked_no_update (connection, message, NULL))
2479 _dbus_connection_detach_pending_call_and_unlock (connection,
2481 goto error_unlocked;
2485 *pending_return = pending;
2488 _dbus_connection_detach_pending_call_unlocked (connection, pending);
2489 dbus_pending_call_unref (pending);
2492 _dbus_verbose ("%s middle\n", _DBUS_FUNCTION_NAME);
2493 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2495 /* this calls out to user code */
2496 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2501 CONNECTION_UNLOCK (connection);
2503 dbus_pending_call_unref (pending);
2507 /* This is slightly strange since we can pop a message here without
2508 * the dispatch lock.
2511 check_for_reply_unlocked (DBusConnection *connection,
2512 dbus_uint32_t client_serial)
2516 HAVE_LOCK_CHECK (connection);
2518 link = _dbus_list_get_first_link (&connection->incoming_messages);
2520 while (link != NULL)
2522 DBusMessage *reply = link->data;
2524 if (dbus_message_get_reply_serial (reply) == client_serial)
2526 _dbus_list_remove_link (&connection->incoming_messages, link);
2527 connection->n_incoming -= 1;
2530 link = _dbus_list_get_next_link (&connection->incoming_messages, link);
2537 * When a function that blocks has been called with a timeout, and we
2538 * run out of memory, the time to wait for memory is based on the
2539 * timeout. If the caller was willing to block a long time we wait a
2540 * relatively long time for memory, if they were only willing to block
2541 * briefly then we retry for memory at a rapid rate.
2543 * @timeout_milliseconds the timeout requested for blocking
2546 _dbus_memory_pause_based_on_timeout (int timeout_milliseconds)
2548 if (timeout_milliseconds == -1)
2549 _dbus_sleep_milliseconds (1000);
2550 else if (timeout_milliseconds < 100)
2551 ; /* just busy loop */
2552 else if (timeout_milliseconds <= 1000)
2553 _dbus_sleep_milliseconds (timeout_milliseconds / 3);
2555 _dbus_sleep_milliseconds (1000);
2559 * Blocks until a pending call times out or gets a reply.
2561 * Does not re-enter the main loop or run filter/path-registered
2562 * callbacks. The reply to the message will not be seen by
2565 * Returns immediately if pending call already got a reply.
2567 * @todo could use performance improvements (it keeps scanning
2568 * the whole message queue for example)
2570 * @param pending the pending call we block for a reply on
2573 _dbus_connection_block_pending_call (DBusPendingCall *pending)
2575 long start_tv_sec, start_tv_usec;
2576 long end_tv_sec, end_tv_usec;
2577 long tv_sec, tv_usec;
2578 DBusDispatchStatus status;
2579 DBusConnection *connection;
2580 dbus_uint32_t client_serial;
2581 int timeout_milliseconds;
2583 _dbus_assert (pending != NULL);
2585 if (dbus_pending_call_get_completed (pending))
2588 if (pending->connection == NULL)
2589 return; /* call already detached */
2591 dbus_pending_call_ref (pending); /* necessary because the call could be canceled */
2593 connection = pending->connection;
2594 client_serial = pending->reply_serial;
2596 /* note that timeout_milliseconds is limited to a smallish value
2597 * in _dbus_pending_call_new() so overflows aren't possible
2600 timeout_milliseconds = dbus_timeout_get_interval (pending->timeout);
2602 /* Flush message queue */
2603 dbus_connection_flush (connection);
2605 CONNECTION_LOCK (connection);
2607 _dbus_get_current_time (&start_tv_sec, &start_tv_usec);
2608 end_tv_sec = start_tv_sec + timeout_milliseconds / 1000;
2609 end_tv_usec = start_tv_usec + (timeout_milliseconds % 1000) * 1000;
2610 end_tv_sec += end_tv_usec / _DBUS_USEC_PER_SECOND;
2611 end_tv_usec = end_tv_usec % _DBUS_USEC_PER_SECOND;
2613 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): will block %d milliseconds for reply serial %u from %ld sec %ld usec to %ld sec %ld usec\n",
2614 timeout_milliseconds,
2616 start_tv_sec, start_tv_usec,
2617 end_tv_sec, end_tv_usec);
2619 /* Now we wait... */
2620 /* always block at least once as we know we don't have the reply yet */
2621 _dbus_connection_do_iteration_unlocked (connection,
2622 DBUS_ITERATION_DO_READING |
2623 DBUS_ITERATION_BLOCK,
2624 timeout_milliseconds);
2628 _dbus_verbose ("%s top of recheck\n", _DBUS_FUNCTION_NAME);
2630 HAVE_LOCK_CHECK (connection);
2632 /* queue messages and get status */
2634 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2636 /* the get_completed() is in case a dispatch() while we were blocking
2637 * got the reply instead of us.
2639 if (dbus_pending_call_get_completed (pending))
2641 _dbus_verbose ("Pending call completed by dispatch in %s\n", _DBUS_FUNCTION_NAME);
2642 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2643 dbus_pending_call_unref (pending);
2647 if (status == DBUS_DISPATCH_DATA_REMAINS)
2651 reply = check_for_reply_unlocked (connection, client_serial);
2654 _dbus_verbose ("%s checked for reply\n", _DBUS_FUNCTION_NAME);
2656 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): got reply\n");
2658 _dbus_pending_call_complete_and_unlock (pending, reply);
2659 dbus_message_unref (reply);
2661 CONNECTION_LOCK (connection);
2662 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2663 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2664 dbus_pending_call_unref (pending);
2670 _dbus_get_current_time (&tv_sec, &tv_usec);
2672 if (!_dbus_connection_get_is_connected_unlocked (connection))
2674 /* FIXME send a "DBUS_ERROR_DISCONNECTED" instead, just to help
2675 * programmers understand what went wrong since the timeout is
2679 _dbus_pending_call_complete_and_unlock (pending, NULL);
2680 dbus_pending_call_unref (pending);
2683 else if (tv_sec < start_tv_sec)
2684 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): clock set backward\n");
2685 else if (connection->disconnect_message_link == NULL)
2686 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): disconnected\n");
2687 else if (tv_sec < end_tv_sec ||
2688 (tv_sec == end_tv_sec && tv_usec < end_tv_usec))
2690 timeout_milliseconds = (end_tv_sec - tv_sec) * 1000 +
2691 (end_tv_usec - tv_usec) / 1000;
2692 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): %d milliseconds remain\n", timeout_milliseconds);
2693 _dbus_assert (timeout_milliseconds >= 0);
2695 if (status == DBUS_DISPATCH_NEED_MEMORY)
2697 /* Try sleeping a bit, as we aren't sure we need to block for reading,
2698 * we may already have a reply in the buffer and just can't process
2701 _dbus_verbose ("dbus_connection_send_with_reply_and_block() waiting for more memory\n");
2703 _dbus_memory_pause_based_on_timeout (timeout_milliseconds);
2707 /* block again, we don't have the reply buffered yet. */
2708 _dbus_connection_do_iteration_unlocked (connection,
2709 DBUS_ITERATION_DO_READING |
2710 DBUS_ITERATION_BLOCK,
2711 timeout_milliseconds);
2714 goto recheck_status;
2717 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): Waited %ld milliseconds and got no reply\n",
2718 (tv_sec - start_tv_sec) * 1000 + (tv_usec - start_tv_usec) / 1000);
2720 _dbus_assert (!dbus_pending_call_get_completed (pending));
2722 /* unlock and call user code */
2723 _dbus_pending_call_complete_and_unlock (pending, NULL);
2725 /* update user code on dispatch status */
2726 CONNECTION_LOCK (connection);
2727 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2728 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2729 dbus_pending_call_unref (pending);
2733 * Sends a message and blocks a certain time period while waiting for
2734 * a reply. This function does not reenter the main loop,
2735 * i.e. messages other than the reply are queued up but not
2736 * processed. This function is used to do non-reentrant "method
2739 * If a normal reply is received, it is returned, and removed from the
2740 * incoming message queue. If it is not received, #NULL is returned
2741 * and the error is set to #DBUS_ERROR_NO_REPLY. If an error reply is
2742 * received, it is converted to a #DBusError and returned as an error,
2743 * then the reply message is deleted. If something else goes wrong,
2744 * result is set to whatever is appropriate, such as
2745 * #DBUS_ERROR_NO_MEMORY or #DBUS_ERROR_DISCONNECTED.
2747 * @param connection the connection
2748 * @param message the message to send
2749 * @param timeout_milliseconds timeout in milliseconds or -1 for default
2750 * @param error return location for error message
2751 * @returns the message that is the reply or #NULL with an error code if the
2755 dbus_connection_send_with_reply_and_block (DBusConnection *connection,
2756 DBusMessage *message,
2757 int timeout_milliseconds,
2761 DBusPendingCall *pending;
2763 _dbus_return_val_if_fail (connection != NULL, NULL);
2764 _dbus_return_val_if_fail (message != NULL, NULL);
2765 _dbus_return_val_if_fail (timeout_milliseconds >= 0 || timeout_milliseconds == -1, NULL);
2766 _dbus_return_val_if_error_is_set (error, NULL);
2768 if (!dbus_connection_send_with_reply (connection, message,
2769 &pending, timeout_milliseconds))
2771 _DBUS_SET_OOM (error);
2775 _dbus_assert (pending != NULL);
2777 dbus_pending_call_block (pending);
2779 reply = dbus_pending_call_steal_reply (pending);
2780 dbus_pending_call_unref (pending);
2782 /* call_complete_and_unlock() called from pending_call_block() should
2783 * always fill this in.
2785 _dbus_assert (reply != NULL);
2787 if (dbus_set_error_from_message (error, reply))
2789 dbus_message_unref (reply);
2797 * Blocks until the outgoing message queue is empty.
2799 * @param connection the connection.
2802 dbus_connection_flush (DBusConnection *connection)
2804 /* We have to specify DBUS_ITERATION_DO_READING here because
2805 * otherwise we could have two apps deadlock if they are both doing
2806 * a flush(), and the kernel buffers fill up. This could change the
2809 DBusDispatchStatus status;
2811 _dbus_return_if_fail (connection != NULL);
2813 CONNECTION_LOCK (connection);
2814 while (connection->n_outgoing > 0 &&
2815 _dbus_connection_get_is_connected_unlocked (connection))
2817 _dbus_verbose ("doing iteration in %s\n", _DBUS_FUNCTION_NAME);
2818 HAVE_LOCK_CHECK (connection);
2819 _dbus_connection_do_iteration_unlocked (connection,
2820 DBUS_ITERATION_DO_READING |
2821 DBUS_ITERATION_DO_WRITING |
2822 DBUS_ITERATION_BLOCK,
2826 HAVE_LOCK_CHECK (connection);
2827 _dbus_verbose ("%s middle\n", _DBUS_FUNCTION_NAME);
2828 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2830 HAVE_LOCK_CHECK (connection);
2831 /* Unlocks and calls out to user code */
2832 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2834 _dbus_verbose ("%s end\n", _DBUS_FUNCTION_NAME);
2838 * This function is intended for use with applications that don't want
2839 * to write a main loop and deal with #DBusWatch and #DBusTimeout. An
2840 * example usage would be:
2843 * while (dbus_connection_read_write_dispatch (connection, -1))
2844 * ; // empty loop body
2847 * In this usage you would normally have set up a filter function to look
2848 * at each message as it is dispatched. The loop terminates when the last
2849 * message from the connection (the disconnected signal) is processed.
2851 * If there are messages to dispatch and the dispatch flag is set, this
2852 * function will dbus_connection_dispatch() once, and return. If there are no
2853 * messages to dispatch, this function will block until it can read or write,
2854 * then read or write, then return.
2856 * The way to think of this function is that it either makes some sort
2857 * of progress, or it blocks.
2859 * The return value indicates whether the disconnect message has been
2860 * processed, NOT whether the connection is connected. This is
2861 * important because even after disconnecting, you want to process any
2862 * messages you received prior to the disconnect.
2864 * @param connection the connection
2865 * @param timeout_milliseconds max time to block or -1 for infinite
2866 * @param dispatch dispatch new messages or leave them on the incoming queue
2867 * @returns #TRUE if the disconnect message has not been processed
2870 _dbus_connection_read_write_dispatch (DBusConnection *connection,
2871 int timeout_milliseconds,
2872 dbus_bool_t dispatch)
2874 DBusDispatchStatus dstatus;
2875 dbus_bool_t dispatched_disconnected;
2877 _dbus_return_val_if_fail (connection != NULL, FALSE);
2878 _dbus_return_val_if_fail (timeout_milliseconds >= 0 || timeout_milliseconds == -1, FALSE);
2879 dstatus = dbus_connection_get_dispatch_status (connection);
2881 if (dispatch && dstatus == DBUS_DISPATCH_DATA_REMAINS)
2883 _dbus_verbose ("doing dispatch in %s\n", _DBUS_FUNCTION_NAME);
2884 dbus_connection_dispatch (connection);
2885 CONNECTION_LOCK (connection);
2887 else if (dstatus == DBUS_DISPATCH_NEED_MEMORY)
2889 _dbus_verbose ("pausing for memory in %s\n", _DBUS_FUNCTION_NAME);
2890 _dbus_memory_pause_based_on_timeout (timeout_milliseconds);
2891 CONNECTION_LOCK (connection);
2895 CONNECTION_LOCK (connection);
2896 if (_dbus_connection_get_is_connected_unlocked (connection))
2898 _dbus_verbose ("doing iteration in %s\n", _DBUS_FUNCTION_NAME);
2899 _dbus_connection_do_iteration_unlocked (connection,
2900 DBUS_ITERATION_DO_READING |
2901 DBUS_ITERATION_DO_WRITING |
2902 DBUS_ITERATION_BLOCK,
2903 timeout_milliseconds);
2907 HAVE_LOCK_CHECK (connection);
2908 dispatched_disconnected = connection->n_incoming == 0 &&
2909 connection->disconnect_message_link == NULL;
2910 CONNECTION_UNLOCK (connection);
2911 return !dispatched_disconnected; /* TRUE if we have not processed disconnected */
2916 * This function is intended for use with applications that don't want
2917 * to write a main loop and deal with #DBusWatch and #DBusTimeout. An
2918 * example usage would be:
2921 * while (dbus_connection_read_write_dispatch (connection, -1))
2922 * ; // empty loop body
2925 * In this usage you would normally have set up a filter function to look
2926 * at each message as it is dispatched. The loop terminates when the last
2927 * message from the connection (the disconnected signal) is processed.
2929 * If there are messages to dispatch, this function will
2930 * dbus_connection_dispatch() once, and return. If there are no
2931 * messages to dispatch, this function will block until it can read or
2932 * write, then read or write, then return.
2934 * The way to think of this function is that it either makes some sort
2935 * of progress, or it blocks.
2937 * The return value indicates whether the disconnect message has been
2938 * processed, NOT whether the connection is connected. This is
2939 * important because even after disconnecting, you want to process any
2940 * messages you received prior to the disconnect.
2942 * @param connection the connection
2943 * @param timeout_milliseconds max time to block or -1 for infinite
2944 * @returns #TRUE if the disconnect message has not been processed
2947 dbus_connection_read_write_dispatch (DBusConnection *connection,
2948 int timeout_milliseconds)
2950 return _dbus_connection_read_write_dispatch(connection, timeout_milliseconds, TRUE);
2954 * This function is intended for use with applications that don't want to
2955 * write a main loop and deal with #DBusWatch and #DBusTimeout.
2957 * If there are no messages to dispatch, this function will block until it can
2958 * read or write, then read or write, then return.
2960 * The return value indicates whether the disconnect message has been
2961 * processed, NOT whether the connection is connected. This is important
2962 * because even after disconnecting, you want to process any messages you
2963 * received prior to the disconnect.
2965 * @param connection the connection
2966 * @param timeout_milliseconds max time to block or -1 for infinite
2967 * @returns #TRUE if the disconnect message has not been processed
2970 dbus_connection_read_write (DBusConnection *connection,
2971 int timeout_milliseconds)
2973 return _dbus_connection_read_write_dispatch(connection, timeout_milliseconds, FALSE);
2977 * Returns the first-received message from the incoming message queue,
2978 * leaving it in the queue. If the queue is empty, returns #NULL.
2980 * The caller does not own a reference to the returned message, and
2981 * must either return it using dbus_connection_return_message() or
2982 * keep it after calling dbus_connection_steal_borrowed_message(). No
2983 * one can get at the message while its borrowed, so return it as
2984 * quickly as possible and don't keep a reference to it after
2985 * returning it. If you need to keep the message, make a copy of it.
2987 * dbus_connection_dispatch() will block if called while a borrowed
2988 * message is outstanding; only one piece of code can be playing with
2989 * the incoming queue at a time. This function will block if called
2990 * during a dbus_connection_dispatch().
2992 * @param connection the connection.
2993 * @returns next message in the incoming queue.
2996 dbus_connection_borrow_message (DBusConnection *connection)
2998 DBusDispatchStatus status;
2999 DBusMessage *message;
3001 _dbus_return_val_if_fail (connection != NULL, NULL);
3003 _dbus_verbose ("%s start\n", _DBUS_FUNCTION_NAME);
3005 /* this is called for the side effect that it queues
3006 * up any messages from the transport
3008 status = dbus_connection_get_dispatch_status (connection);
3009 if (status != DBUS_DISPATCH_DATA_REMAINS)
3012 CONNECTION_LOCK (connection);
3014 _dbus_connection_acquire_dispatch (connection);
3016 /* While a message is outstanding, the dispatch lock is held */
3017 _dbus_assert (connection->message_borrowed == NULL);
3019 connection->message_borrowed = _dbus_list_get_first (&connection->incoming_messages);
3021 message = connection->message_borrowed;
3023 /* Note that we KEEP the dispatch lock until the message is returned */
3024 if (message == NULL)
3025 _dbus_connection_release_dispatch (connection);
3027 CONNECTION_UNLOCK (connection);
3033 * Used to return a message after peeking at it using
3034 * dbus_connection_borrow_message(). Only called if
3035 * message from dbus_connection_borrow_message() was non-#NULL.
3037 * @param connection the connection
3038 * @param message the message from dbus_connection_borrow_message()
3041 dbus_connection_return_message (DBusConnection *connection,
3042 DBusMessage *message)
3044 _dbus_return_if_fail (connection != NULL);
3045 _dbus_return_if_fail (message != NULL);
3046 _dbus_return_if_fail (message == connection->message_borrowed);
3047 _dbus_return_if_fail (connection->dispatch_acquired);
3049 CONNECTION_LOCK (connection);
3051 _dbus_assert (message == connection->message_borrowed);
3053 connection->message_borrowed = NULL;
3055 _dbus_connection_release_dispatch (connection);
3057 CONNECTION_UNLOCK (connection);
3061 * Used to keep a message after peeking at it using
3062 * dbus_connection_borrow_message(). Before using this function, see
3063 * the caveats/warnings in the documentation for
3064 * dbus_connection_pop_message().
3066 * @param connection the connection
3067 * @param message the message from dbus_connection_borrow_message()
3070 dbus_connection_steal_borrowed_message (DBusConnection *connection,
3071 DBusMessage *message)
3073 DBusMessage *pop_message;
3075 _dbus_return_if_fail (connection != NULL);
3076 _dbus_return_if_fail (message != NULL);
3077 _dbus_return_if_fail (message == connection->message_borrowed);
3078 _dbus_return_if_fail (connection->dispatch_acquired);
3080 CONNECTION_LOCK (connection);
3082 _dbus_assert (message == connection->message_borrowed);
3084 pop_message = _dbus_list_pop_first (&connection->incoming_messages);
3085 _dbus_assert (message == pop_message);
3087 connection->n_incoming -= 1;
3089 _dbus_verbose ("Incoming message %p stolen from queue, %d incoming\n",
3090 message, connection->n_incoming);
3092 connection->message_borrowed = NULL;
3094 _dbus_connection_release_dispatch (connection);
3096 CONNECTION_UNLOCK (connection);
3099 /* See dbus_connection_pop_message, but requires the caller to own
3100 * the lock before calling. May drop the lock while running.
3103 _dbus_connection_pop_message_link_unlocked (DBusConnection *connection)
3105 HAVE_LOCK_CHECK (connection);
3107 _dbus_assert (connection->message_borrowed == NULL);
3109 if (connection->n_incoming > 0)
3113 link = _dbus_list_pop_first_link (&connection->incoming_messages);
3114 connection->n_incoming -= 1;
3116 _dbus_verbose ("Message %p (%d %s %s %s '%s') removed from incoming queue %p, %d incoming\n",
3118 dbus_message_get_type (link->data),
3119 dbus_message_get_path (link->data) ?
3120 dbus_message_get_path (link->data) :
3122 dbus_message_get_interface (link->data) ?
3123 dbus_message_get_interface (link->data) :
3125 dbus_message_get_member (link->data) ?
3126 dbus_message_get_member (link->data) :
3128 dbus_message_get_signature (link->data),
3129 connection, connection->n_incoming);
3137 /* See dbus_connection_pop_message, but requires the caller to own
3138 * the lock before calling. May drop the lock while running.
3141 _dbus_connection_pop_message_unlocked (DBusConnection *connection)
3145 HAVE_LOCK_CHECK (connection);
3147 link = _dbus_connection_pop_message_link_unlocked (connection);
3151 DBusMessage *message;
3153 message = link->data;
3155 _dbus_list_free_link (link);
3164 _dbus_connection_putback_message_link_unlocked (DBusConnection *connection,
3165 DBusList *message_link)
3167 HAVE_LOCK_CHECK (connection);
3169 _dbus_assert (message_link != NULL);
3170 /* You can't borrow a message while a link is outstanding */
3171 _dbus_assert (connection->message_borrowed == NULL);
3172 /* We had to have the dispatch lock across the pop/putback */
3173 _dbus_assert (connection->dispatch_acquired);
3175 _dbus_list_prepend_link (&connection->incoming_messages,
3177 connection->n_incoming += 1;
3179 _dbus_verbose ("Message %p (%d %s %s '%s') put back into queue %p, %d incoming\n",
3181 dbus_message_get_type (message_link->data),
3182 dbus_message_get_interface (message_link->data) ?
3183 dbus_message_get_interface (message_link->data) :
3185 dbus_message_get_member (message_link->data) ?
3186 dbus_message_get_member (message_link->data) :
3188 dbus_message_get_signature (message_link->data),
3189 connection, connection->n_incoming);
3193 * Returns the first-received message from the incoming message queue,
3194 * removing it from the queue. The caller owns a reference to the
3195 * returned message. If the queue is empty, returns #NULL.
3197 * This function bypasses any message handlers that are registered,
3198 * and so using it is usually wrong. Instead, let the main loop invoke
3199 * dbus_connection_dispatch(). Popping messages manually is only
3200 * useful in very simple programs that don't share a #DBusConnection
3201 * with any libraries or other modules.
3203 * There is a lock that covers all ways of accessing the incoming message
3204 * queue, so dbus_connection_dispatch(), dbus_connection_pop_message(),
3205 * dbus_connection_borrow_message(), etc. will all block while one of the others
3206 * in the group is running.
3208 * @param connection the connection.
3209 * @returns next message in the incoming queue.
3212 dbus_connection_pop_message (DBusConnection *connection)
3214 DBusMessage *message;
3215 DBusDispatchStatus status;
3217 _dbus_verbose ("%s start\n", _DBUS_FUNCTION_NAME);
3219 /* this is called for the side effect that it queues
3220 * up any messages from the transport
3222 status = dbus_connection_get_dispatch_status (connection);
3223 if (status != DBUS_DISPATCH_DATA_REMAINS)
3226 CONNECTION_LOCK (connection);
3227 _dbus_connection_acquire_dispatch (connection);
3228 HAVE_LOCK_CHECK (connection);
3230 message = _dbus_connection_pop_message_unlocked (connection);
3232 _dbus_verbose ("Returning popped message %p\n", message);
3234 _dbus_connection_release_dispatch (connection);
3235 CONNECTION_UNLOCK (connection);
3241 * Acquire the dispatcher. This is a separate lock so the main
3242 * connection lock can be dropped to call out to application dispatch
3245 * @param connection the connection.
3248 _dbus_connection_acquire_dispatch (DBusConnection *connection)
3250 HAVE_LOCK_CHECK (connection);
3252 _dbus_connection_ref_unlocked (connection);
3253 CONNECTION_UNLOCK (connection);
3255 _dbus_verbose ("%s locking dispatch_mutex\n", _DBUS_FUNCTION_NAME);
3256 _dbus_mutex_lock (connection->dispatch_mutex);
3258 while (connection->dispatch_acquired)
3260 _dbus_verbose ("%s waiting for dispatch to be acquirable\n", _DBUS_FUNCTION_NAME);
3261 _dbus_condvar_wait (connection->dispatch_cond, connection->dispatch_mutex);
3264 _dbus_assert (!connection->dispatch_acquired);
3266 connection->dispatch_acquired = TRUE;
3268 _dbus_verbose ("%s unlocking dispatch_mutex\n", _DBUS_FUNCTION_NAME);
3269 _dbus_mutex_unlock (connection->dispatch_mutex);
3271 CONNECTION_LOCK (connection);
3272 _dbus_connection_unref_unlocked (connection);
3276 * Release the dispatcher when you're done with it. Only call
3277 * after you've acquired the dispatcher. Wakes up at most one
3278 * thread currently waiting to acquire the dispatcher.
3280 * @param connection the connection.
3283 _dbus_connection_release_dispatch (DBusConnection *connection)
3285 HAVE_LOCK_CHECK (connection);
3287 _dbus_verbose ("%s locking dispatch_mutex\n", _DBUS_FUNCTION_NAME);
3288 _dbus_mutex_lock (connection->dispatch_mutex);
3290 _dbus_assert (connection->dispatch_acquired);
3292 connection->dispatch_acquired = FALSE;
3293 _dbus_condvar_wake_one (connection->dispatch_cond);
3295 _dbus_verbose ("%s unlocking dispatch_mutex\n", _DBUS_FUNCTION_NAME);
3296 _dbus_mutex_unlock (connection->dispatch_mutex);
3300 _dbus_connection_failed_pop (DBusConnection *connection,
3301 DBusList *message_link)
3303 _dbus_list_prepend_link (&connection->incoming_messages,
3305 connection->n_incoming += 1;
3308 static DBusDispatchStatus
3309 _dbus_connection_get_dispatch_status_unlocked (DBusConnection *connection)
3311 HAVE_LOCK_CHECK (connection);
3313 if (connection->n_incoming > 0)
3314 return DBUS_DISPATCH_DATA_REMAINS;
3315 else if (!_dbus_transport_queue_messages (connection->transport))
3316 return DBUS_DISPATCH_NEED_MEMORY;
3319 DBusDispatchStatus status;
3320 dbus_bool_t is_connected;
3322 status = _dbus_transport_get_dispatch_status (connection->transport);
3323 is_connected = _dbus_transport_get_is_connected (connection->transport);
3325 _dbus_verbose ("dispatch status = %s is_connected = %d\n",
3326 DISPATCH_STATUS_NAME (status), is_connected);
3330 if (status == DBUS_DISPATCH_COMPLETE &&
3331 connection->disconnect_message_link)
3333 _dbus_verbose ("Sending disconnect message from %s\n",
3334 _DBUS_FUNCTION_NAME);
3336 connection_forget_shared_unlocked (connection);
3338 /* We haven't sent the disconnect message already,
3339 * and all real messages have been queued up.
3341 _dbus_connection_queue_synthesized_message_link (connection,
3342 connection->disconnect_message_link);
3343 connection->disconnect_message_link = NULL;
3345 status = DBUS_DISPATCH_DATA_REMAINS;
3348 /* Dump the outgoing queue, we aren't going to be able to
3349 * send it now, and we'd like accessors like
3350 * dbus_connection_get_outgoing_size() to be accurate.
3352 if (connection->n_outgoing > 0)
3356 _dbus_verbose ("Dropping %d outgoing messages since we're disconnected\n",
3357 connection->n_outgoing);
3359 while ((link = _dbus_list_get_last_link (&connection->outgoing_messages)))
3361 _dbus_connection_message_sent (connection, link->data);
3366 if (status != DBUS_DISPATCH_COMPLETE)
3368 else if (connection->n_incoming > 0)
3369 return DBUS_DISPATCH_DATA_REMAINS;
3371 return DBUS_DISPATCH_COMPLETE;
3376 _dbus_connection_update_dispatch_status_and_unlock (DBusConnection *connection,
3377 DBusDispatchStatus new_status)
3379 dbus_bool_t changed;
3380 DBusDispatchStatusFunction function;
3383 HAVE_LOCK_CHECK (connection);
3385 _dbus_connection_ref_unlocked (connection);
3387 changed = new_status != connection->last_dispatch_status;
3389 connection->last_dispatch_status = new_status;
3391 function = connection->dispatch_status_function;
3392 data = connection->dispatch_status_data;
3394 /* We drop the lock */
3395 CONNECTION_UNLOCK (connection);
3397 if (changed && function)
3399 _dbus_verbose ("Notifying of change to dispatch status of %p now %d (%s)\n",
3400 connection, new_status,
3401 DISPATCH_STATUS_NAME (new_status));
3402 (* function) (connection, new_status, data);
3405 dbus_connection_unref (connection);
3409 * Gets the current state (what we would currently return
3410 * from dbus_connection_dispatch()) but doesn't actually
3411 * dispatch any messages.
3413 * @param connection the connection.
3414 * @returns current dispatch status
3417 dbus_connection_get_dispatch_status (DBusConnection *connection)
3419 DBusDispatchStatus status;
3421 _dbus_return_val_if_fail (connection != NULL, DBUS_DISPATCH_COMPLETE);
3423 _dbus_verbose ("%s start\n", _DBUS_FUNCTION_NAME);
3425 CONNECTION_LOCK (connection);
3427 status = _dbus_connection_get_dispatch_status_unlocked (connection);
3429 CONNECTION_UNLOCK (connection);
3435 * Filter funtion for handling the Peer standard interface
3437 static DBusHandlerResult
3438 _dbus_connection_peer_filter_unlocked_no_update (DBusConnection *connection,
3439 DBusMessage *message)
3441 if (dbus_message_is_method_call (message,
3442 DBUS_INTERFACE_PEER,
3448 ret = dbus_message_new_method_return (message);
3450 return DBUS_HANDLER_RESULT_NEED_MEMORY;
3452 sent = _dbus_connection_send_unlocked_no_update (connection, ret, NULL);
3454 dbus_message_unref (ret);
3457 return DBUS_HANDLER_RESULT_NEED_MEMORY;
3459 return DBUS_HANDLER_RESULT_HANDLED;
3463 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
3467 * Processes all builtin filter functions
3469 * If the spec specifies a standard interface
3470 * they should be processed from this method
3472 static DBusHandlerResult
3473 _dbus_connection_run_builtin_filters_unlocked_no_update (DBusConnection *connection,
3474 DBusMessage *message)
3476 /* We just run one filter for now but have the option to run more
3477 if the spec calls for it in the future */
3479 return _dbus_connection_peer_filter_unlocked_no_update (connection, message);
3483 * Processes data buffered while handling watches, queueing zero or
3484 * more incoming messages. Then pops the first-received message from
3485 * the current incoming message queue, runs any handlers for it, and
3486 * unrefs the message. Returns a status indicating whether messages/data
3487 * remain, more memory is needed, or all data has been processed.
3489 * Even if the dispatch status is #DBUS_DISPATCH_DATA_REMAINS,
3490 * does not necessarily dispatch a message, as the data may
3491 * be part of authentication or the like.
3493 * @todo some FIXME in here about handling DBUS_HANDLER_RESULT_NEED_MEMORY
3495 * @todo FIXME what if we call out to application code to handle a
3496 * message, holding the dispatch lock, and the application code runs
3497 * the main loop and dispatches again? Probably deadlocks at the
3498 * moment. Maybe we want a dispatch status of DBUS_DISPATCH_IN_PROGRESS,
3499 * and then the GSource etc. could handle the situation? Right now
3500 * our GSource is NO_RECURSE
3502 * @param connection the connection
3503 * @returns dispatch status
3506 dbus_connection_dispatch (DBusConnection *connection)
3508 DBusMessage *message;
3509 DBusList *link, *filter_list_copy, *message_link;
3510 DBusHandlerResult result;
3511 DBusPendingCall *pending;
3512 dbus_int32_t reply_serial;
3513 DBusDispatchStatus status;
3515 _dbus_return_val_if_fail (connection != NULL, DBUS_DISPATCH_COMPLETE);
3517 _dbus_verbose ("%s\n", _DBUS_FUNCTION_NAME);
3519 CONNECTION_LOCK (connection);
3520 status = _dbus_connection_get_dispatch_status_unlocked (connection);
3521 if (status != DBUS_DISPATCH_DATA_REMAINS)
3523 /* unlocks and calls out to user code */
3524 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
3528 /* We need to ref the connection since the callback could potentially
3529 * drop the last ref to it
3531 _dbus_connection_ref_unlocked (connection);
3533 _dbus_connection_acquire_dispatch (connection);
3534 HAVE_LOCK_CHECK (connection);
3536 message_link = _dbus_connection_pop_message_link_unlocked (connection);
3537 if (message_link == NULL)
3539 /* another thread dispatched our stuff */
3541 _dbus_verbose ("another thread dispatched message (during acquire_dispatch above)\n");
3543 _dbus_connection_release_dispatch (connection);
3545 status = _dbus_connection_get_dispatch_status_unlocked (connection);
3547 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
3549 dbus_connection_unref (connection);
3554 message = message_link->data;
3556 _dbus_verbose (" dispatching message %p (%d %s %s '%s')\n",
3558 dbus_message_get_type (message),
3559 dbus_message_get_interface (message) ?
3560 dbus_message_get_interface (message) :
3562 dbus_message_get_member (message) ?
3563 dbus_message_get_member (message) :
3565 dbus_message_get_signature (message));
3567 result = DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
3569 /* Pending call handling must be first, because if you do
3570 * dbus_connection_send_with_reply_and_block() or
3571 * dbus_pending_call_block() then no handlers/filters will be run on
3572 * the reply. We want consistent semantics in the case where we
3573 * dbus_connection_dispatch() the reply.
3576 reply_serial = dbus_message_get_reply_serial (message);
3577 pending = _dbus_hash_table_lookup_int (connection->pending_replies,
3581 _dbus_verbose ("Dispatching a pending reply\n");
3582 _dbus_pending_call_complete_and_unlock (pending, message);
3583 pending = NULL; /* it's probably unref'd */
3585 CONNECTION_LOCK (connection);
3586 _dbus_verbose ("pending call completed in dispatch\n");
3587 result = DBUS_HANDLER_RESULT_HANDLED;
3591 result = _dbus_connection_run_builtin_filters_unlocked_no_update (connection, message);
3592 if (result != DBUS_HANDLER_RESULT_NOT_YET_HANDLED)
3595 if (!_dbus_list_copy (&connection->filter_list, &filter_list_copy))
3597 _dbus_connection_release_dispatch (connection);
3598 HAVE_LOCK_CHECK (connection);
3600 _dbus_connection_failed_pop (connection, message_link);
3602 /* unlocks and calls user code */
3603 _dbus_connection_update_dispatch_status_and_unlock (connection,
3604 DBUS_DISPATCH_NEED_MEMORY);
3607 dbus_pending_call_unref (pending);
3608 dbus_connection_unref (connection);
3610 return DBUS_DISPATCH_NEED_MEMORY;
3613 _dbus_list_foreach (&filter_list_copy,
3614 (DBusForeachFunction)_dbus_message_filter_ref,
3617 /* We're still protected from dispatch() reentrancy here
3618 * since we acquired the dispatcher
3620 CONNECTION_UNLOCK (connection);
3622 link = _dbus_list_get_first_link (&filter_list_copy);
3623 while (link != NULL)
3625 DBusMessageFilter *filter = link->data;
3626 DBusList *next = _dbus_list_get_next_link (&filter_list_copy, link);
3628 _dbus_verbose (" running filter on message %p\n", message);
3629 result = (* filter->function) (connection, message, filter->user_data);
3631 if (result != DBUS_HANDLER_RESULT_NOT_YET_HANDLED)
3637 _dbus_list_foreach (&filter_list_copy,
3638 (DBusForeachFunction)_dbus_message_filter_unref,
3640 _dbus_list_clear (&filter_list_copy);
3642 CONNECTION_LOCK (connection);
3644 if (result == DBUS_HANDLER_RESULT_NEED_MEMORY)
3646 _dbus_verbose ("No memory in %s\n", _DBUS_FUNCTION_NAME);
3649 else if (result == DBUS_HANDLER_RESULT_HANDLED)
3651 _dbus_verbose ("filter handled message in dispatch\n");
3655 /* We're still protected from dispatch() reentrancy here
3656 * since we acquired the dispatcher
3658 _dbus_verbose (" running object path dispatch on message %p (%d %s %s '%s')\n",
3660 dbus_message_get_type (message),
3661 dbus_message_get_interface (message) ?
3662 dbus_message_get_interface (message) :
3664 dbus_message_get_member (message) ?
3665 dbus_message_get_member (message) :
3667 dbus_message_get_signature (message));
3669 HAVE_LOCK_CHECK (connection);
3670 result = _dbus_object_tree_dispatch_and_unlock (connection->objects,
3673 CONNECTION_LOCK (connection);
3675 if (result != DBUS_HANDLER_RESULT_NOT_YET_HANDLED)
3677 _dbus_verbose ("object tree handled message in dispatch\n");
3681 if (dbus_message_get_type (message) == DBUS_MESSAGE_TYPE_METHOD_CALL)
3685 DBusPreallocatedSend *preallocated;
3687 _dbus_verbose (" sending error %s\n",
3688 DBUS_ERROR_UNKNOWN_METHOD);
3690 if (!_dbus_string_init (&str))
3692 result = DBUS_HANDLER_RESULT_NEED_MEMORY;
3693 _dbus_verbose ("no memory for error string in dispatch\n");
3697 if (!_dbus_string_append_printf (&str,
3698 "Method \"%s\" with signature \"%s\" on interface \"%s\" doesn't exist\n",
3699 dbus_message_get_member (message),
3700 dbus_message_get_signature (message),
3701 dbus_message_get_interface (message)))
3703 _dbus_string_free (&str);
3704 result = DBUS_HANDLER_RESULT_NEED_MEMORY;
3705 _dbus_verbose ("no memory for error string in dispatch\n");
3709 reply = dbus_message_new_error (message,
3710 DBUS_ERROR_UNKNOWN_METHOD,
3711 _dbus_string_get_const_data (&str));
3712 _dbus_string_free (&str);
3716 result = DBUS_HANDLER_RESULT_NEED_MEMORY;
3717 _dbus_verbose ("no memory for error reply in dispatch\n");
3721 preallocated = _dbus_connection_preallocate_send_unlocked (connection);
3723 if (preallocated == NULL)
3725 dbus_message_unref (reply);
3726 result = DBUS_HANDLER_RESULT_NEED_MEMORY;
3727 _dbus_verbose ("no memory for error send in dispatch\n");
3731 _dbus_connection_send_preallocated_unlocked_no_update (connection, preallocated,
3734 dbus_message_unref (reply);
3736 result = DBUS_HANDLER_RESULT_HANDLED;
3739 _dbus_verbose (" done dispatching %p (%d %s %s '%s') on connection %p\n", message,
3740 dbus_message_get_type (message),
3741 dbus_message_get_interface (message) ?
3742 dbus_message_get_interface (message) :
3744 dbus_message_get_member (message) ?
3745 dbus_message_get_member (message) :
3747 dbus_message_get_signature (message),
3751 if (result == DBUS_HANDLER_RESULT_NEED_MEMORY)
3753 _dbus_verbose ("out of memory in %s\n", _DBUS_FUNCTION_NAME);
3755 /* Put message back, and we'll start over.
3756 * Yes this means handlers must be idempotent if they
3757 * don't return HANDLED; c'est la vie.
3759 _dbus_connection_putback_message_link_unlocked (connection,
3764 _dbus_verbose (" ... done dispatching in %s\n", _DBUS_FUNCTION_NAME);
3766 if (connection->exit_on_disconnect &&
3767 dbus_message_is_signal (message,
3768 DBUS_INTERFACE_LOCAL,
3771 _dbus_verbose ("Exiting on Disconnected signal\n");
3772 CONNECTION_UNLOCK (connection);
3774 _dbus_assert_not_reached ("Call to exit() returned");
3777 _dbus_list_free_link (message_link);
3778 dbus_message_unref (message); /* don't want the message to count in max message limits
3779 * in computing dispatch status below
3783 _dbus_connection_release_dispatch (connection);
3784 HAVE_LOCK_CHECK (connection);
3786 _dbus_verbose ("%s before final status update\n", _DBUS_FUNCTION_NAME);
3787 status = _dbus_connection_get_dispatch_status_unlocked (connection);
3789 /* unlocks and calls user code */
3790 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
3792 dbus_connection_unref (connection);
3798 * Sets the watch functions for the connection. These functions are
3799 * responsible for making the application's main loop aware of file
3800 * descriptors that need to be monitored for events, using select() or
3801 * poll(). When using Qt, typically the DBusAddWatchFunction would
3802 * create a QSocketNotifier. When using GLib, the DBusAddWatchFunction
3803 * could call g_io_add_watch(), or could be used as part of a more
3804 * elaborate GSource. Note that when a watch is added, it may
3807 * The DBusWatchToggledFunction notifies the application that the
3808 * watch has been enabled or disabled. Call dbus_watch_get_enabled()
3809 * to check this. A disabled watch should have no effect, and enabled
3810 * watch should be added to the main loop. This feature is used
3811 * instead of simply adding/removing the watch because
3812 * enabling/disabling can be done without memory allocation. The
3813 * toggled function may be NULL if a main loop re-queries
3814 * dbus_watch_get_enabled() every time anyway.
3816 * The DBusWatch can be queried for the file descriptor to watch using
3817 * dbus_watch_get_fd(), and for the events to watch for using
3818 * dbus_watch_get_flags(). The flags returned by
3819 * dbus_watch_get_flags() will only contain DBUS_WATCH_READABLE and
3820 * DBUS_WATCH_WRITABLE, never DBUS_WATCH_HANGUP or DBUS_WATCH_ERROR;
3821 * all watches implicitly include a watch for hangups, errors, and
3822 * other exceptional conditions.
3824 * Once a file descriptor becomes readable or writable, or an exception
3825 * occurs, dbus_watch_handle() should be called to
3826 * notify the connection of the file descriptor's condition.
3828 * dbus_watch_handle() cannot be called during the
3829 * DBusAddWatchFunction, as the connection will not be ready to handle
3832 * It is not allowed to reference a DBusWatch after it has been passed
3833 * to remove_function.
3835 * If #FALSE is returned due to lack of memory, the failure may be due
3836 * to a #FALSE return from the new add_function. If so, the
3837 * add_function may have been called successfully one or more times,
3838 * but the remove_function will also have been called to remove any
3839 * successful adds. i.e. if #FALSE is returned the net result
3840 * should be that dbus_connection_set_watch_functions() has no effect,
3841 * but the add_function and remove_function may have been called.
3843 * @todo We need to drop the lock when we call the
3844 * add/remove/toggled functions which can be a side effect
3845 * of setting the watch functions.
3847 * @param connection the connection.
3848 * @param add_function function to begin monitoring a new descriptor.
3849 * @param remove_function function to stop monitoring a descriptor.
3850 * @param toggled_function function to notify of enable/disable
3851 * @param data data to pass to add_function and remove_function.
3852 * @param free_data_function function to be called to free the data.
3853 * @returns #FALSE on failure (no memory)
3856 dbus_connection_set_watch_functions (DBusConnection *connection,
3857 DBusAddWatchFunction add_function,
3858 DBusRemoveWatchFunction remove_function,
3859 DBusWatchToggledFunction toggled_function,
3861 DBusFreeFunction free_data_function)
3864 DBusWatchList *watches;
3866 _dbus_return_val_if_fail (connection != NULL, FALSE);
3868 CONNECTION_LOCK (connection);
3870 #ifndef DBUS_DISABLE_CHECKS
3871 if (connection->watches == NULL)
3873 _dbus_warn ("Re-entrant call to %s is not allowed\n",
3874 _DBUS_FUNCTION_NAME);
3879 /* ref connection for slightly better reentrancy */
3880 _dbus_connection_ref_unlocked (connection);
3882 /* This can call back into user code, and we need to drop the
3883 * connection lock when it does. This is kind of a lame
3886 watches = connection->watches;
3887 connection->watches = NULL;
3888 CONNECTION_UNLOCK (connection);
3890 retval = _dbus_watch_list_set_functions (watches,
3891 add_function, remove_function,
3893 data, free_data_function);
3894 CONNECTION_LOCK (connection);
3895 connection->watches = watches;
3897 CONNECTION_UNLOCK (connection);
3898 /* drop our paranoid refcount */
3899 dbus_connection_unref (connection);
3905 * Sets the timeout functions for the connection. These functions are
3906 * responsible for making the application's main loop aware of timeouts.
3907 * When using Qt, typically the DBusAddTimeoutFunction would create a
3908 * QTimer. When using GLib, the DBusAddTimeoutFunction would call
3911 * The DBusTimeoutToggledFunction notifies the application that the
3912 * timeout has been enabled or disabled. Call
3913 * dbus_timeout_get_enabled() to check this. A disabled timeout should
3914 * have no effect, and enabled timeout should be added to the main
3915 * loop. This feature is used instead of simply adding/removing the
3916 * timeout because enabling/disabling can be done without memory
3917 * allocation. With Qt, QTimer::start() and QTimer::stop() can be used
3918 * to enable and disable. The toggled function may be NULL if a main
3919 * loop re-queries dbus_timeout_get_enabled() every time anyway.
3920 * Whenever a timeout is toggled, its interval may change.
3922 * The DBusTimeout can be queried for the timer interval using
3923 * dbus_timeout_get_interval(). dbus_timeout_handle() should be called
3924 * repeatedly, each time the interval elapses, starting after it has
3925 * elapsed once. The timeout stops firing when it is removed with the
3926 * given remove_function. The timer interval may change whenever the
3927 * timeout is added, removed, or toggled.
3929 * @param connection the connection.
3930 * @param add_function function to add a timeout.
3931 * @param remove_function function to remove a timeout.
3932 * @param toggled_function function to notify of enable/disable
3933 * @param data data to pass to add_function and remove_function.
3934 * @param free_data_function function to be called to free the data.
3935 * @returns #FALSE on failure (no memory)
3938 dbus_connection_set_timeout_functions (DBusConnection *connection,
3939 DBusAddTimeoutFunction add_function,
3940 DBusRemoveTimeoutFunction remove_function,
3941 DBusTimeoutToggledFunction toggled_function,
3943 DBusFreeFunction free_data_function)
3946 DBusTimeoutList *timeouts;
3948 _dbus_return_val_if_fail (connection != NULL, FALSE);
3950 CONNECTION_LOCK (connection);
3952 #ifndef DBUS_DISABLE_CHECKS
3953 if (connection->timeouts == NULL)
3955 _dbus_warn ("Re-entrant call to %s is not allowed\n",
3956 _DBUS_FUNCTION_NAME);
3961 /* ref connection for slightly better reentrancy */
3962 _dbus_connection_ref_unlocked (connection);
3964 timeouts = connection->timeouts;
3965 connection->timeouts = NULL;
3966 CONNECTION_UNLOCK (connection);
3968 retval = _dbus_timeout_list_set_functions (timeouts,
3969 add_function, remove_function,
3971 data, free_data_function);
3972 CONNECTION_LOCK (connection);
3973 connection->timeouts = timeouts;
3975 CONNECTION_UNLOCK (connection);
3976 /* drop our paranoid refcount */
3977 dbus_connection_unref (connection);
3983 * Sets the mainloop wakeup function for the connection. This function is
3984 * responsible for waking up the main loop (if its sleeping) when some some
3985 * change has happened to the connection that the mainloop needs to reconsider
3986 * (e.g. a message has been queued for writing).
3987 * When using Qt, this typically results in a call to QEventLoop::wakeUp().
3988 * When using GLib, it would call g_main_context_wakeup().
3991 * @param connection the connection.
3992 * @param wakeup_main_function function to wake up the mainloop
3993 * @param data data to pass wakeup_main_function
3994 * @param free_data_function function to be called to free the data.
3997 dbus_connection_set_wakeup_main_function (DBusConnection *connection,
3998 DBusWakeupMainFunction wakeup_main_function,
4000 DBusFreeFunction free_data_function)
4003 DBusFreeFunction old_free_data;
4005 _dbus_return_if_fail (connection != NULL);
4007 CONNECTION_LOCK (connection);
4008 old_data = connection->wakeup_main_data;
4009 old_free_data = connection->free_wakeup_main_data;
4011 connection->wakeup_main_function = wakeup_main_function;
4012 connection->wakeup_main_data = data;
4013 connection->free_wakeup_main_data = free_data_function;
4015 CONNECTION_UNLOCK (connection);
4017 /* Callback outside the lock */
4019 (*old_free_data) (old_data);
4023 * Set a function to be invoked when the dispatch status changes.
4024 * If the dispatch status is #DBUS_DISPATCH_DATA_REMAINS, then
4025 * dbus_connection_dispatch() needs to be called to process incoming
4026 * messages. However, dbus_connection_dispatch() MUST NOT BE CALLED
4027 * from inside the DBusDispatchStatusFunction. Indeed, almost
4028 * any reentrancy in this function is a bad idea. Instead,
4029 * the DBusDispatchStatusFunction should simply save an indication
4030 * that messages should be dispatched later, when the main loop
4033 * @param connection the connection
4034 * @param function function to call on dispatch status changes
4035 * @param data data for function
4036 * @param free_data_function free the function data
4039 dbus_connection_set_dispatch_status_function (DBusConnection *connection,
4040 DBusDispatchStatusFunction function,
4042 DBusFreeFunction free_data_function)
4045 DBusFreeFunction old_free_data;
4047 _dbus_return_if_fail (connection != NULL);
4049 CONNECTION_LOCK (connection);
4050 old_data = connection->dispatch_status_data;
4051 old_free_data = connection->free_dispatch_status_data;
4053 connection->dispatch_status_function = function;
4054 connection->dispatch_status_data = data;
4055 connection->free_dispatch_status_data = free_data_function;
4057 CONNECTION_UNLOCK (connection);
4059 /* Callback outside the lock */
4061 (*old_free_data) (old_data);
4065 * Get the UNIX file descriptor of the connection, if any. This can
4066 * be used for SELinux access control checks with getpeercon() for
4067 * example. DO NOT read or write to the file descriptor, or try to
4068 * select() on it; use DBusWatch for main loop integration. Not all
4069 * connections will have a file descriptor. So for adding descriptors
4070 * to the main loop, use dbus_watch_get_fd() and so forth.
4072 * @param connection the connection
4073 * @param fd return location for the file descriptor.
4074 * @returns #TRUE if fd is successfully obtained.
4077 dbus_connection_get_unix_fd (DBusConnection *connection,
4082 _dbus_return_val_if_fail (connection != NULL, FALSE);
4083 _dbus_return_val_if_fail (connection->transport != NULL, FALSE);
4085 CONNECTION_LOCK (connection);
4087 retval = _dbus_transport_get_unix_fd (connection->transport,
4090 CONNECTION_UNLOCK (connection);
4096 * Gets the UNIX user ID of the connection if any.
4097 * Returns #TRUE if the uid is filled in.
4098 * Always returns #FALSE on non-UNIX platforms.
4099 * Always returns #FALSE prior to authenticating the
4102 * @param connection the connection
4103 * @param uid return location for the user ID
4104 * @returns #TRUE if uid is filled in with a valid user ID
4107 dbus_connection_get_unix_user (DBusConnection *connection,
4112 _dbus_return_val_if_fail (connection != NULL, FALSE);
4113 _dbus_return_val_if_fail (uid != NULL, FALSE);
4115 CONNECTION_LOCK (connection);
4117 if (!_dbus_transport_get_is_authenticated (connection->transport))
4120 result = _dbus_transport_get_unix_user (connection->transport,
4122 CONNECTION_UNLOCK (connection);
4128 * Gets the process ID of the connection if any.
4129 * Returns #TRUE if the uid is filled in.
4130 * Always returns #FALSE prior to authenticating the
4133 * @param connection the connection
4134 * @param pid return location for the process ID
4135 * @returns #TRUE if uid is filled in with a valid process ID
4138 dbus_connection_get_unix_process_id (DBusConnection *connection,
4143 _dbus_return_val_if_fail (connection != NULL, FALSE);
4144 _dbus_return_val_if_fail (pid != NULL, FALSE);
4146 CONNECTION_LOCK (connection);
4148 if (!_dbus_transport_get_is_authenticated (connection->transport))
4151 result = _dbus_transport_get_unix_process_id (connection->transport,
4153 CONNECTION_UNLOCK (connection);
4159 * Sets a predicate function used to determine whether a given user ID
4160 * is allowed to connect. When an incoming connection has
4161 * authenticated with a particular user ID, this function is called;
4162 * if it returns #TRUE, the connection is allowed to proceed,
4163 * otherwise the connection is disconnected.
4165 * If the function is set to #NULL (as it is by default), then
4166 * only the same UID as the server process will be allowed to
4169 * @param connection the connection
4170 * @param function the predicate
4171 * @param data data to pass to the predicate
4172 * @param free_data_function function to free the data
4175 dbus_connection_set_unix_user_function (DBusConnection *connection,
4176 DBusAllowUnixUserFunction function,
4178 DBusFreeFunction free_data_function)
4180 void *old_data = NULL;
4181 DBusFreeFunction old_free_function = NULL;
4183 _dbus_return_if_fail (connection != NULL);
4185 CONNECTION_LOCK (connection);
4186 _dbus_transport_set_unix_user_function (connection->transport,
4187 function, data, free_data_function,
4188 &old_data, &old_free_function);
4189 CONNECTION_UNLOCK (connection);
4191 if (old_free_function != NULL)
4192 (* old_free_function) (old_data);
4196 * Adds a message filter. Filters are handlers that are run on all
4197 * incoming messages, prior to the objects registered with
4198 * dbus_connection_register_object_path(). Filters are run in the
4199 * order that they were added. The same handler can be added as a
4200 * filter more than once, in which case it will be run more than once.
4201 * Filters added during a filter callback won't be run on the message
4204 * @todo we don't run filters on messages while blocking without
4205 * entering the main loop, since filters are run as part of
4206 * dbus_connection_dispatch(). This is probably a feature, as filters
4207 * could create arbitrary reentrancy. But kind of sucks if you're
4208 * trying to filter METHOD_RETURN for some reason.
4210 * @param connection the connection
4211 * @param function function to handle messages
4212 * @param user_data user data to pass to the function
4213 * @param free_data_function function to use for freeing user data
4214 * @returns #TRUE on success, #FALSE if not enough memory.
4217 dbus_connection_add_filter (DBusConnection *connection,
4218 DBusHandleMessageFunction function,
4220 DBusFreeFunction free_data_function)
4222 DBusMessageFilter *filter;
4224 _dbus_return_val_if_fail (connection != NULL, FALSE);
4225 _dbus_return_val_if_fail (function != NULL, FALSE);
4227 filter = dbus_new0 (DBusMessageFilter, 1);
4231 filter->refcount.value = 1;
4233 CONNECTION_LOCK (connection);
4235 if (!_dbus_list_append (&connection->filter_list,
4238 _dbus_message_filter_unref (filter);
4239 CONNECTION_UNLOCK (connection);
4243 /* Fill in filter after all memory allocated,
4244 * so we don't run the free_user_data_function
4245 * if the add_filter() fails
4248 filter->function = function;
4249 filter->user_data = user_data;
4250 filter->free_user_data_function = free_data_function;
4252 CONNECTION_UNLOCK (connection);
4257 * Removes a previously-added message filter. It is a programming
4258 * error to call this function for a handler that has not been added
4259 * as a filter. If the given handler was added more than once, only
4260 * one instance of it will be removed (the most recently-added
4263 * @param connection the connection
4264 * @param function the handler to remove
4265 * @param user_data user data for the handler to remove
4269 dbus_connection_remove_filter (DBusConnection *connection,
4270 DBusHandleMessageFunction function,
4274 DBusMessageFilter *filter;
4276 _dbus_return_if_fail (connection != NULL);
4277 _dbus_return_if_fail (function != NULL);
4279 CONNECTION_LOCK (connection);
4283 link = _dbus_list_get_last_link (&connection->filter_list);
4284 while (link != NULL)
4286 filter = link->data;
4288 if (filter->function == function &&
4289 filter->user_data == user_data)
4291 _dbus_list_remove_link (&connection->filter_list, link);
4292 filter->function = NULL;
4297 link = _dbus_list_get_prev_link (&connection->filter_list, link);
4300 CONNECTION_UNLOCK (connection);
4302 #ifndef DBUS_DISABLE_CHECKS
4305 _dbus_warn ("Attempt to remove filter function %p user data %p, but no such filter has been added\n",
4306 function, user_data);
4311 /* Call application code */
4312 if (filter->free_user_data_function)
4313 (* filter->free_user_data_function) (filter->user_data);
4315 filter->free_user_data_function = NULL;
4316 filter->user_data = NULL;
4318 _dbus_message_filter_unref (filter);
4322 * Registers a handler for a given path in the object hierarchy.
4323 * The given vtable handles messages sent to exactly the given path.
4326 * @param connection the connection
4327 * @param path a '/' delimited string of path elements
4328 * @param vtable the virtual table
4329 * @param user_data data to pass to functions in the vtable
4330 * @returns #FALSE if not enough memory
4333 dbus_connection_register_object_path (DBusConnection *connection,
4335 const DBusObjectPathVTable *vtable,
4338 char **decomposed_path;
4341 _dbus_return_val_if_fail (connection != NULL, FALSE);
4342 _dbus_return_val_if_fail (path != NULL, FALSE);
4343 _dbus_return_val_if_fail (path[0] == '/', FALSE);
4344 _dbus_return_val_if_fail (vtable != NULL, FALSE);
4346 if (!_dbus_decompose_path (path, strlen (path), &decomposed_path, NULL))
4349 CONNECTION_LOCK (connection);
4351 retval = _dbus_object_tree_register (connection->objects,
4353 (const char **) decomposed_path, vtable,
4356 CONNECTION_UNLOCK (connection);
4358 dbus_free_string_array (decomposed_path);
4364 * Registers a fallback handler for a given subsection of the object
4365 * hierarchy. The given vtable handles messages at or below the given
4366 * path. You can use this to establish a default message handling
4367 * policy for a whole "subdirectory."
4369 * @param connection the connection
4370 * @param path a '/' delimited string of path elements
4371 * @param vtable the virtual table
4372 * @param user_data data to pass to functions in the vtable
4373 * @returns #FALSE if not enough memory
4376 dbus_connection_register_fallback (DBusConnection *connection,
4378 const DBusObjectPathVTable *vtable,
4381 char **decomposed_path;
4384 _dbus_return_val_if_fail (connection != NULL, FALSE);
4385 _dbus_return_val_if_fail (path != NULL, FALSE);
4386 _dbus_return_val_if_fail (path[0] == '/', FALSE);
4387 _dbus_return_val_if_fail (vtable != NULL, FALSE);
4389 if (!_dbus_decompose_path (path, strlen (path), &decomposed_path, NULL))
4392 CONNECTION_LOCK (connection);
4394 retval = _dbus_object_tree_register (connection->objects,
4396 (const char **) decomposed_path, vtable,
4399 CONNECTION_UNLOCK (connection);
4401 dbus_free_string_array (decomposed_path);
4407 * Unregisters the handler registered with exactly the given path.
4408 * It's a bug to call this function for a path that isn't registered.
4409 * Can unregister both fallback paths and object paths.
4411 * @param connection the connection
4412 * @param path a '/' delimited string of path elements
4413 * @returns #FALSE if not enough memory
4416 dbus_connection_unregister_object_path (DBusConnection *connection,
4419 char **decomposed_path;
4421 _dbus_return_val_if_fail (connection != NULL, FALSE);
4422 _dbus_return_val_if_fail (path != NULL, FALSE);
4423 _dbus_return_val_if_fail (path[0] == '/', FALSE);
4425 if (!_dbus_decompose_path (path, strlen (path), &decomposed_path, NULL))
4428 CONNECTION_LOCK (connection);
4430 _dbus_object_tree_unregister_and_unlock (connection->objects, (const char **) decomposed_path);
4432 dbus_free_string_array (decomposed_path);
4438 * Gets the user data passed to dbus_connection_register_object_path()
4439 * or dbus_connection_register_fallback(). If nothing was registered
4440 * at this path, the data is filled in with #NULL.
4442 * @param connection the connection
4443 * @param path the path you registered with
4444 * @param data_p location to store the user data, or #NULL
4445 * @returns #FALSE if not enough memory
4448 dbus_connection_get_object_path_data (DBusConnection *connection,
4452 char **decomposed_path;
4454 _dbus_return_val_if_fail (connection != NULL, FALSE);
4455 _dbus_return_val_if_fail (path != NULL, FALSE);
4456 _dbus_return_val_if_fail (data_p != NULL, FALSE);
4460 if (!_dbus_decompose_path (path, strlen (path), &decomposed_path, NULL))
4463 CONNECTION_LOCK (connection);
4465 *data_p = _dbus_object_tree_get_user_data_unlocked (connection->objects, (const char**) decomposed_path);
4467 CONNECTION_UNLOCK (connection);
4469 dbus_free_string_array (decomposed_path);
4475 * Lists the registered fallback handlers and object path handlers at
4476 * the given parent_path. The returned array should be freed with
4477 * dbus_free_string_array().
4479 * @param connection the connection
4480 * @param parent_path the path to list the child handlers of
4481 * @param child_entries returns #NULL-terminated array of children
4482 * @returns #FALSE if no memory to allocate the child entries
4485 dbus_connection_list_registered (DBusConnection *connection,
4486 const char *parent_path,
4487 char ***child_entries)
4489 char **decomposed_path;
4491 _dbus_return_val_if_fail (connection != NULL, FALSE);
4492 _dbus_return_val_if_fail (parent_path != NULL, FALSE);
4493 _dbus_return_val_if_fail (parent_path[0] == '/', FALSE);
4494 _dbus_return_val_if_fail (child_entries != NULL, FALSE);
4496 if (!_dbus_decompose_path (parent_path, strlen (parent_path), &decomposed_path, NULL))
4499 CONNECTION_LOCK (connection);
4501 retval = _dbus_object_tree_list_registered_and_unlock (connection->objects,
4502 (const char **) decomposed_path,
4504 dbus_free_string_array (decomposed_path);
4509 static DBusDataSlotAllocator slot_allocator;
4510 _DBUS_DEFINE_GLOBAL_LOCK (connection_slots);
4513 * Allocates an integer ID to be used for storing application-specific
4514 * data on any DBusConnection. The allocated ID may then be used
4515 * with dbus_connection_set_data() and dbus_connection_get_data().
4516 * The passed-in slot must be initialized to -1, and is filled in
4517 * with the slot ID. If the passed-in slot is not -1, it's assumed
4518 * to be already allocated, and its refcount is incremented.
4520 * The allocated slot is global, i.e. all DBusConnection objects will
4521 * have a slot with the given integer ID reserved.
4523 * @param slot_p address of a global variable storing the slot
4524 * @returns #FALSE on failure (no memory)
4527 dbus_connection_allocate_data_slot (dbus_int32_t *slot_p)
4529 return _dbus_data_slot_allocator_alloc (&slot_allocator,
4530 _DBUS_LOCK_NAME (connection_slots),
4535 * Deallocates a global ID for connection data slots.
4536 * dbus_connection_get_data() and dbus_connection_set_data() may no
4537 * longer be used with this slot. Existing data stored on existing
4538 * DBusConnection objects will be freed when the connection is
4539 * finalized, but may not be retrieved (and may only be replaced if
4540 * someone else reallocates the slot). When the refcount on the
4541 * passed-in slot reaches 0, it is set to -1.
4543 * @param slot_p address storing the slot to deallocate
4546 dbus_connection_free_data_slot (dbus_int32_t *slot_p)
4548 _dbus_return_if_fail (*slot_p >= 0);
4550 _dbus_data_slot_allocator_free (&slot_allocator, slot_p);
4554 * Stores a pointer on a DBusConnection, along
4555 * with an optional function to be used for freeing
4556 * the data when the data is set again, or when
4557 * the connection is finalized. The slot number
4558 * must have been allocated with dbus_connection_allocate_data_slot().
4560 * @param connection the connection
4561 * @param slot the slot number
4562 * @param data the data to store
4563 * @param free_data_func finalizer function for the data
4564 * @returns #TRUE if there was enough memory to store the data
4567 dbus_connection_set_data (DBusConnection *connection,
4570 DBusFreeFunction free_data_func)
4572 DBusFreeFunction old_free_func;
4576 _dbus_return_val_if_fail (connection != NULL, FALSE);
4577 _dbus_return_val_if_fail (slot >= 0, FALSE);
4579 CONNECTION_LOCK (connection);
4581 retval = _dbus_data_slot_list_set (&slot_allocator,
4582 &connection->slot_list,
4583 slot, data, free_data_func,
4584 &old_free_func, &old_data);
4586 CONNECTION_UNLOCK (connection);
4590 /* Do the actual free outside the connection lock */
4592 (* old_free_func) (old_data);
4599 * Retrieves data previously set with dbus_connection_set_data().
4600 * The slot must still be allocated (must not have been freed).
4602 * @param connection the connection
4603 * @param slot the slot to get data from
4604 * @returns the data, or #NULL if not found
4607 dbus_connection_get_data (DBusConnection *connection,
4612 _dbus_return_val_if_fail (connection != NULL, NULL);
4614 CONNECTION_LOCK (connection);
4616 res = _dbus_data_slot_list_get (&slot_allocator,
4617 &connection->slot_list,
4620 CONNECTION_UNLOCK (connection);
4626 * This function sets a global flag for whether dbus_connection_new()
4627 * will set SIGPIPE behavior to SIG_IGN.
4629 * @param will_modify_sigpipe #TRUE to allow sigpipe to be set to SIG_IGN
4632 dbus_connection_set_change_sigpipe (dbus_bool_t will_modify_sigpipe)
4634 _dbus_modify_sigpipe = will_modify_sigpipe != FALSE;
4638 * Specifies the maximum size message this connection is allowed to
4639 * receive. Larger messages will result in disconnecting the
4642 * @param connection a #DBusConnection
4643 * @param size maximum message size the connection can receive, in bytes
4646 dbus_connection_set_max_message_size (DBusConnection *connection,
4649 _dbus_return_if_fail (connection != NULL);
4651 CONNECTION_LOCK (connection);
4652 _dbus_transport_set_max_message_size (connection->transport,
4654 CONNECTION_UNLOCK (connection);
4658 * Gets the value set by dbus_connection_set_max_message_size().
4660 * @param connection the connection
4661 * @returns the max size of a single message
4664 dbus_connection_get_max_message_size (DBusConnection *connection)
4668 _dbus_return_val_if_fail (connection != NULL, 0);
4670 CONNECTION_LOCK (connection);
4671 res = _dbus_transport_get_max_message_size (connection->transport);
4672 CONNECTION_UNLOCK (connection);
4677 * Sets the maximum total number of bytes that can be used for all messages
4678 * received on this connection. Messages count toward the maximum until
4679 * they are finalized. When the maximum is reached, the connection will
4680 * not read more data until some messages are finalized.
4682 * The semantics of the maximum are: if outstanding messages are
4683 * already above the maximum, additional messages will not be read.
4684 * The semantics are not: if the next message would cause us to exceed
4685 * the maximum, we don't read it. The reason is that we don't know the
4686 * size of a message until after we read it.
4688 * Thus, the max live messages size can actually be exceeded
4689 * by up to the maximum size of a single message.
4691 * Also, if we read say 1024 bytes off the wire in a single read(),
4692 * and that contains a half-dozen small messages, we may exceed the
4693 * size max by that amount. But this should be inconsequential.
4695 * This does imply that we can't call read() with a buffer larger
4696 * than we're willing to exceed this limit by.
4698 * @param connection the connection
4699 * @param size the maximum size in bytes of all outstanding messages
4702 dbus_connection_set_max_received_size (DBusConnection *connection,
4705 _dbus_return_if_fail (connection != NULL);
4707 CONNECTION_LOCK (connection);
4708 _dbus_transport_set_max_received_size (connection->transport,
4710 CONNECTION_UNLOCK (connection);
4714 * Gets the value set by dbus_connection_set_max_received_size().
4716 * @param connection the connection
4717 * @returns the max size of all live messages
4720 dbus_connection_get_max_received_size (DBusConnection *connection)
4724 _dbus_return_val_if_fail (connection != NULL, 0);
4726 CONNECTION_LOCK (connection);
4727 res = _dbus_transport_get_max_received_size (connection->transport);
4728 CONNECTION_UNLOCK (connection);
4733 * Gets the approximate size in bytes of all messages in the outgoing
4734 * message queue. The size is approximate in that you shouldn't use
4735 * it to decide how many bytes to read off the network or anything
4736 * of that nature, as optimizations may choose to tell small white lies
4737 * to avoid performance overhead.
4739 * @param connection the connection
4740 * @returns the number of bytes that have been queued up but not sent
4743 dbus_connection_get_outgoing_size (DBusConnection *connection)
4747 _dbus_return_val_if_fail (connection != NULL, 0);
4749 CONNECTION_LOCK (connection);
4750 res = _dbus_counter_get_value (connection->outgoing_counter);
4751 CONNECTION_UNLOCK (connection);