1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* dbus-connection.c DBusConnection object
4 * Copyright (C) 2002-2006 Red Hat Inc.
6 * Licensed under the Academic Free License version 2.1
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #include "dbus-shared.h"
26 #include "dbus-connection.h"
27 #include "dbus-list.h"
28 #include "dbus-timeout.h"
29 #include "dbus-transport.h"
30 #include "dbus-watch.h"
31 #include "dbus-connection-internal.h"
32 #include "dbus-pending-call-internal.h"
33 #include "dbus-list.h"
34 #include "dbus-hash.h"
35 #include "dbus-message-internal.h"
36 #include "dbus-threads.h"
37 #include "dbus-protocol.h"
38 #include "dbus-dataslot.h"
39 #include "dbus-string.h"
40 #include "dbus-pending-call.h"
41 #include "dbus-object-tree.h"
42 #include "dbus-threads-internal.h"
45 #ifdef DBUS_DISABLE_CHECKS
46 #define TOOK_LOCK_CHECK(connection)
47 #define RELEASING_LOCK_CHECK(connection)
48 #define HAVE_LOCK_CHECK(connection)
50 #define TOOK_LOCK_CHECK(connection) do { \
51 _dbus_assert (!(connection)->have_connection_lock); \
52 (connection)->have_connection_lock = TRUE; \
54 #define RELEASING_LOCK_CHECK(connection) do { \
55 _dbus_assert ((connection)->have_connection_lock); \
56 (connection)->have_connection_lock = FALSE; \
58 #define HAVE_LOCK_CHECK(connection) _dbus_assert ((connection)->have_connection_lock)
59 /* A "DO_NOT_HAVE_LOCK_CHECK" is impossible since we need the lock to check the flag */
64 #define CONNECTION_LOCK(connection) do { \
65 if (TRACE_LOCKS) { _dbus_verbose (" LOCK: %s\n", _DBUS_FUNCTION_NAME); } \
66 _dbus_mutex_lock ((connection)->mutex); \
67 TOOK_LOCK_CHECK (connection); \
70 #define CONNECTION_UNLOCK(connection) do { \
71 if (TRACE_LOCKS) { _dbus_verbose (" UNLOCK: %s\n", _DBUS_FUNCTION_NAME); } \
72 RELEASING_LOCK_CHECK (connection); \
73 _dbus_mutex_unlock ((connection)->mutex); \
76 #define DISPATCH_STATUS_NAME(s) \
77 ((s) == DBUS_DISPATCH_COMPLETE ? "complete" : \
78 (s) == DBUS_DISPATCH_DATA_REMAINS ? "data remains" : \
79 (s) == DBUS_DISPATCH_NEED_MEMORY ? "need memory" : \
83 * @defgroup DBusConnection DBusConnection
85 * @brief Connection to another application
87 * A DBusConnection represents a connection to another
88 * application. Messages can be sent and received via this connection.
89 * The other application may be a message bus; for convenience, the
90 * function dbus_bus_get() is provided to automatically open a
91 * connection to the well-known message buses.
93 * In brief a DBusConnection is a message queue associated with some
94 * message transport mechanism such as a socket. The connection
95 * maintains a queue of incoming messages and a queue of outgoing
98 * Several functions use the following terms:
100 * <li><b>read</b> means to fill the incoming message queue by reading from the socket</li>
101 * <li><b>write</b> means to drain the outgoing queue by writing to the socket</li>
102 * <li><b>dispatch</b> means to drain the incoming queue by invoking application-provided message handlers</li>
105 * The function dbus_connection_read_write_dispatch() for example does all
106 * three of these things, offering a simple alternative to a main loop.
108 * In an application with a main loop, the read/write/dispatch
109 * operations are usually separate.
111 * The connection provides #DBusWatch and #DBusTimeout objects to
112 * the main loop. These are used to know when reading, writing, or
113 * dispatching should be performed.
115 * Incoming messages are processed
116 * by calling dbus_connection_dispatch(). dbus_connection_dispatch()
117 * runs any handlers registered for the topmost message in the message
118 * queue, then discards the message, then returns.
120 * dbus_connection_get_dispatch_status() indicates whether
121 * messages are currently in the queue that need dispatching.
122 * dbus_connection_set_dispatch_status_function() allows
123 * you to set a function to be used to monitor the dispatch status.
125 * If you're using GLib or Qt add-on libraries for D-Bus, there are
126 * special convenience APIs in those libraries that hide
127 * all the details of dispatch and watch/timeout monitoring.
128 * For example, dbus_connection_setup_with_g_main().
130 * If you aren't using these add-on libraries, but want to process
131 * messages asynchronously, you must manually call
132 * dbus_connection_set_dispatch_status_function(),
133 * dbus_connection_set_watch_functions(),
134 * dbus_connection_set_timeout_functions() providing appropriate
135 * functions to integrate the connection with your application's main
136 * loop. This can be tricky to get right; main loops are not simple.
138 * If you don't need to be asynchronous, you can ignore #DBusWatch,
139 * #DBusTimeout, and dbus_connection_dispatch(). Instead,
140 * dbus_connection_read_write_dispatch() can be used.
142 * Or, in <em>very</em> simple applications,
143 * dbus_connection_pop_message() may be all you need, allowing you to
144 * avoid setting up any handler functions (see
145 * dbus_connection_add_filter(),
146 * dbus_connection_register_object_path() for more on handlers).
148 * When you use dbus_connection_send() or one of its variants to send
149 * a message, the message is added to the outgoing queue. It's
150 * actually written to the network later; either in
151 * dbus_watch_handle() invoked by your main loop, or in
152 * dbus_connection_flush() which blocks until it can write out the
153 * entire outgoing queue. The GLib/Qt add-on libraries again
154 * handle the details here for you by setting up watch functions.
156 * When a connection is disconnected, you are guaranteed to get a
157 * signal "Disconnected" from the interface
158 * #DBUS_INTERFACE_LOCAL, path
161 * You may not drop the last reference to a #DBusConnection
162 * until that connection has been disconnected.
164 * You may dispatch the unprocessed incoming message queue even if the
165 * connection is disconnected. However, "Disconnected" will always be
166 * the last message in the queue (obviously no messages are received
167 * after disconnection).
169 * After calling dbus_threads_init(), #DBusConnection has thread
170 * locks and drops them when invoking user callbacks, so in general is
171 * transparently threadsafe. However, #DBusMessage does NOT have
172 * thread locks; you must not send the same message to multiple
173 * #DBusConnection if those connections will be used from different threads,
176 * Also, if you dispatch or pop messages from multiple threads, it
177 * may work in the sense that it won't crash, but it's tough to imagine
178 * sane results; it will be completely unpredictable which messages
179 * go to which threads.
181 * It's recommended to dispatch from a single thread.
183 * The most useful function to call from multiple threads at once
184 * is dbus_connection_send_with_reply_and_block(). That is,
185 * multiple threads can make method calls at the same time.
187 * If you aren't using threads, you can use a main loop and
188 * dbus_pending_call_set_notify() to achieve a similar result.
192 * @defgroup DBusConnectionInternals DBusConnection implementation details
193 * @ingroup DBusInternals
194 * @brief Implementation details of DBusConnection
200 * Internal struct representing a message filter function
202 typedef struct DBusMessageFilter DBusMessageFilter;
205 * Internal struct representing a message filter function
207 struct DBusMessageFilter
209 DBusAtomic refcount; /**< Reference count */
210 DBusHandleMessageFunction function; /**< Function to call to filter */
211 void *user_data; /**< User data for the function */
212 DBusFreeFunction free_user_data_function; /**< Function to free the user data */
217 * Internals of DBusPreallocatedSend
219 struct DBusPreallocatedSend
221 DBusConnection *connection; /**< Connection we'd send the message to */
222 DBusList *queue_link; /**< Preallocated link in the queue */
223 DBusList *counter_link; /**< Preallocated link in the resource counter */
226 static dbus_bool_t _dbus_modify_sigpipe = TRUE;
229 * Implementation details of DBusConnection. All fields are private.
231 struct DBusConnection
233 DBusAtomic refcount; /**< Reference count. */
235 DBusMutex *mutex; /**< Lock on the entire DBusConnection */
237 DBusMutex *dispatch_mutex; /**< Protects dispatch_acquired */
238 DBusCondVar *dispatch_cond; /**< Notify when dispatch_acquired is available */
239 DBusMutex *io_path_mutex; /**< Protects io_path_acquired */
240 DBusCondVar *io_path_cond; /**< Notify when io_path_acquired is available */
242 DBusList *outgoing_messages; /**< Queue of messages we need to send, send the end of the list first. */
243 DBusList *incoming_messages; /**< Queue of messages we have received, end of the list received most recently. */
245 DBusMessage *message_borrowed; /**< Filled in if the first incoming message has been borrowed;
246 * dispatch_acquired will be set by the borrower
249 int n_outgoing; /**< Length of outgoing queue. */
250 int n_incoming; /**< Length of incoming queue. */
252 DBusCounter *outgoing_counter; /**< Counts size of outgoing messages. */
254 DBusTransport *transport; /**< Object that sends/receives messages over network. */
255 DBusWatchList *watches; /**< Stores active watches. */
256 DBusTimeoutList *timeouts; /**< Stores active timeouts. */
258 DBusList *filter_list; /**< List of filters. */
260 DBusDataSlotList slot_list; /**< Data stored by allocated integer ID */
262 DBusHashTable *pending_replies; /**< Hash of message serials to #DBusPendingCall. */
264 dbus_uint32_t client_serial; /**< Client serial. Increments each time a message is sent */
265 DBusList *disconnect_message_link; /**< Preallocated list node for queueing the disconnection message */
267 DBusWakeupMainFunction wakeup_main_function; /**< Function to wake up the mainloop */
268 void *wakeup_main_data; /**< Application data for wakeup_main_function */
269 DBusFreeFunction free_wakeup_main_data; /**< free wakeup_main_data */
271 DBusDispatchStatusFunction dispatch_status_function; /**< Function on dispatch status changes */
272 void *dispatch_status_data; /**< Application data for dispatch_status_function */
273 DBusFreeFunction free_dispatch_status_data; /**< free dispatch_status_data */
275 DBusDispatchStatus last_dispatch_status; /**< The last dispatch status we reported to the application. */
277 DBusList *link_cache; /**< A cache of linked list links to prevent contention
278 * for the global linked list mempool lock
280 DBusObjectTree *objects; /**< Object path handlers registered with this connection */
282 char *server_guid; /**< GUID of server if we are in shared_connections, #NULL if server GUID is unknown or connection is private */
284 /* These two MUST be bools and not bitfields, because they are protected by a separate lock
285 * from connection->mutex and all bitfields in a word have to be read/written together.
286 * So you can't have a different lock for different bitfields in the same word.
288 dbus_bool_t dispatch_acquired; /**< Someone has dispatch path (can drain incoming queue) */
289 dbus_bool_t io_path_acquired; /**< Someone has transport io path (can use the transport to read/write messages) */
291 unsigned int shareable : 1; /**< #TRUE if libdbus owns a reference to the connection and can return it from dbus_connection_open() more than once */
293 unsigned int exit_on_disconnect : 1; /**< If #TRUE, exit after handling disconnect signal */
295 unsigned int route_peer_messages : 1; /**< If #TRUE, if org.freedesktop.DBus.Peer messages have a bus name, don't handle them automatically */
297 unsigned int disconnected_message_arrived : 1; /**< We popped or are dispatching the disconnected message.
298 * if the disconnect_message_link is NULL then we queued it, but
299 * this flag is whether it got to the head of the queue.
301 unsigned int disconnected_message_processed : 1; /**< We did our default handling of the disconnected message,
302 * such as closing the connection.
305 #ifndef DBUS_DISABLE_CHECKS
306 unsigned int have_connection_lock : 1; /**< Used to check locking */
309 #ifndef DBUS_DISABLE_CHECKS
310 int generation; /**< _dbus_current_generation that should correspond to this connection */
314 static DBusDispatchStatus _dbus_connection_get_dispatch_status_unlocked (DBusConnection *connection);
315 static void _dbus_connection_update_dispatch_status_and_unlock (DBusConnection *connection,
316 DBusDispatchStatus new_status);
317 static void _dbus_connection_last_unref (DBusConnection *connection);
318 static void _dbus_connection_acquire_dispatch (DBusConnection *connection);
319 static void _dbus_connection_release_dispatch (DBusConnection *connection);
320 static DBusDispatchStatus _dbus_connection_flush_unlocked (DBusConnection *connection);
321 static void _dbus_connection_close_possibly_shared_and_unlock (DBusConnection *connection);
322 static dbus_bool_t _dbus_connection_get_is_connected_unlocked (DBusConnection *connection);
323 static dbus_bool_t _dbus_connection_peek_for_reply_unlocked (DBusConnection *connection,
324 dbus_uint32_t client_serial);
326 static DBusMessageFilter *
327 _dbus_message_filter_ref (DBusMessageFilter *filter)
329 _dbus_assert (filter->refcount.value > 0);
330 _dbus_atomic_inc (&filter->refcount);
336 _dbus_message_filter_unref (DBusMessageFilter *filter)
338 _dbus_assert (filter->refcount.value > 0);
340 if (_dbus_atomic_dec (&filter->refcount) == 1)
342 if (filter->free_user_data_function)
343 (* filter->free_user_data_function) (filter->user_data);
350 * Acquires the connection lock.
352 * @param connection the connection.
355 _dbus_connection_lock (DBusConnection *connection)
357 CONNECTION_LOCK (connection);
361 * Releases the connection lock.
363 * @param connection the connection.
366 _dbus_connection_unlock (DBusConnection *connection)
368 CONNECTION_UNLOCK (connection);
372 * Wakes up the main loop if it is sleeping
373 * Needed if we're e.g. queueing outgoing messages
374 * on a thread while the mainloop sleeps.
376 * @param connection the connection.
379 _dbus_connection_wakeup_mainloop (DBusConnection *connection)
381 if (connection->wakeup_main_function)
382 (*connection->wakeup_main_function) (connection->wakeup_main_data);
385 #ifdef DBUS_BUILD_TESTS
386 /* For now this function isn't used */
388 * Adds a message to the incoming message queue, returning #FALSE
389 * if there's insufficient memory to queue the message.
390 * Does not take over refcount of the message.
392 * @param connection the connection.
393 * @param message the message to queue.
394 * @returns #TRUE on success.
397 _dbus_connection_queue_received_message (DBusConnection *connection,
398 DBusMessage *message)
402 link = _dbus_list_alloc_link (message);
406 dbus_message_ref (message);
407 _dbus_connection_queue_received_message_link (connection, link);
413 * Gets the locks so we can examine them
415 * @param connection the connection.
416 * @param mutex_loc return for the location of the main mutex pointer
417 * @param dispatch_mutex_loc return location of the dispatch mutex pointer
418 * @param io_path_mutex_loc return location of the io_path mutex pointer
419 * @param dispatch_cond_loc return location of the dispatch conditional
421 * @param io_path_cond_loc return location of the io_path conditional
425 _dbus_connection_test_get_locks (DBusConnection *connection,
426 DBusMutex **mutex_loc,
427 DBusMutex **dispatch_mutex_loc,
428 DBusMutex **io_path_mutex_loc,
429 DBusCondVar **dispatch_cond_loc,
430 DBusCondVar **io_path_cond_loc)
432 *mutex_loc = connection->mutex;
433 *dispatch_mutex_loc = connection->dispatch_mutex;
434 *io_path_mutex_loc = connection->io_path_mutex;
435 *dispatch_cond_loc = connection->dispatch_cond;
436 *io_path_cond_loc = connection->io_path_cond;
441 * Adds a message-containing list link to the incoming message queue,
442 * taking ownership of the link and the message's current refcount.
443 * Cannot fail due to lack of memory.
445 * @param connection the connection.
446 * @param link the message link to queue.
449 _dbus_connection_queue_received_message_link (DBusConnection *connection,
452 DBusPendingCall *pending;
453 dbus_uint32_t reply_serial;
454 DBusMessage *message;
456 _dbus_assert (_dbus_transport_get_is_authenticated (connection->transport));
458 _dbus_list_append_link (&connection->incoming_messages,
460 message = link->data;
462 /* If this is a reply we're waiting on, remove timeout for it */
463 reply_serial = dbus_message_get_reply_serial (message);
464 if (reply_serial != 0)
466 pending = _dbus_hash_table_lookup_int (connection->pending_replies,
470 if (_dbus_pending_call_is_timeout_added_unlocked (pending))
471 _dbus_connection_remove_timeout_unlocked (connection,
472 _dbus_pending_call_get_timeout_unlocked (pending));
474 _dbus_pending_call_set_timeout_added_unlocked (pending, FALSE);
480 connection->n_incoming += 1;
482 _dbus_connection_wakeup_mainloop (connection);
484 _dbus_verbose ("Message %p (%d %s %s %s '%s' reply to %u) added to incoming queue %p, %d incoming\n",
486 dbus_message_get_type (message),
487 dbus_message_get_path (message) ?
488 dbus_message_get_path (message) :
490 dbus_message_get_interface (message) ?
491 dbus_message_get_interface (message) :
493 dbus_message_get_member (message) ?
494 dbus_message_get_member (message) :
496 dbus_message_get_signature (message),
497 dbus_message_get_reply_serial (message),
499 connection->n_incoming);}
502 * Adds a link + message to the incoming message queue.
503 * Can't fail. Takes ownership of both link and message.
505 * @param connection the connection.
506 * @param link the list node and message to queue.
510 _dbus_connection_queue_synthesized_message_link (DBusConnection *connection,
513 HAVE_LOCK_CHECK (connection);
515 _dbus_list_append_link (&connection->incoming_messages, link);
517 connection->n_incoming += 1;
519 _dbus_connection_wakeup_mainloop (connection);
521 _dbus_verbose ("Synthesized message %p added to incoming queue %p, %d incoming\n",
522 link->data, connection, connection->n_incoming);
527 * Checks whether there are messages in the outgoing message queue.
528 * Called with connection lock held.
530 * @param connection the connection.
531 * @returns #TRUE if the outgoing queue is non-empty.
534 _dbus_connection_has_messages_to_send_unlocked (DBusConnection *connection)
536 HAVE_LOCK_CHECK (connection);
537 return connection->outgoing_messages != NULL;
541 * Checks whether there are messages in the outgoing message queue.
542 * Use dbus_connection_flush() to block until all outgoing
543 * messages have been written to the underlying transport
544 * (such as a socket).
546 * @param connection the connection.
547 * @returns #TRUE if the outgoing queue is non-empty.
550 dbus_connection_has_messages_to_send (DBusConnection *connection)
554 _dbus_return_val_if_fail (connection != NULL, FALSE);
556 CONNECTION_LOCK (connection);
557 v = _dbus_connection_has_messages_to_send_unlocked (connection);
558 CONNECTION_UNLOCK (connection);
564 * Gets the next outgoing message. The message remains in the
565 * queue, and the caller does not own a reference to it.
567 * @param connection the connection.
568 * @returns the message to be sent.
571 _dbus_connection_get_message_to_send (DBusConnection *connection)
573 HAVE_LOCK_CHECK (connection);
575 return _dbus_list_get_last (&connection->outgoing_messages);
579 * Notifies the connection that a message has been sent, so the
580 * message can be removed from the outgoing queue.
581 * Called with the connection lock held.
583 * @param connection the connection.
584 * @param message the message that was sent.
587 _dbus_connection_message_sent (DBusConnection *connection,
588 DBusMessage *message)
592 HAVE_LOCK_CHECK (connection);
594 /* This can be called before we even complete authentication, since
595 * it's called on disconnect to clean up the outgoing queue.
596 * It's also called as we successfully send each message.
599 link = _dbus_list_get_last_link (&connection->outgoing_messages);
600 _dbus_assert (link != NULL);
601 _dbus_assert (link->data == message);
603 /* Save this link in the link cache */
604 _dbus_list_unlink (&connection->outgoing_messages,
606 _dbus_list_prepend_link (&connection->link_cache, link);
608 connection->n_outgoing -= 1;
610 _dbus_verbose ("Message %p (%d %s %s %s '%s') removed from outgoing queue %p, %d left to send\n",
612 dbus_message_get_type (message),
613 dbus_message_get_path (message) ?
614 dbus_message_get_path (message) :
616 dbus_message_get_interface (message) ?
617 dbus_message_get_interface (message) :
619 dbus_message_get_member (message) ?
620 dbus_message_get_member (message) :
622 dbus_message_get_signature (message),
623 connection, connection->n_outgoing);
625 /* Save this link in the link cache also */
626 _dbus_message_remove_size_counter (message, connection->outgoing_counter,
628 _dbus_list_prepend_link (&connection->link_cache, link);
630 dbus_message_unref (message);
633 /** Function to be called in protected_change_watch() with refcount held */
634 typedef dbus_bool_t (* DBusWatchAddFunction) (DBusWatchList *list,
636 /** Function to be called in protected_change_watch() with refcount held */
637 typedef void (* DBusWatchRemoveFunction) (DBusWatchList *list,
639 /** Function to be called in protected_change_watch() with refcount held */
640 typedef void (* DBusWatchToggleFunction) (DBusWatchList *list,
642 dbus_bool_t enabled);
645 protected_change_watch (DBusConnection *connection,
647 DBusWatchAddFunction add_function,
648 DBusWatchRemoveFunction remove_function,
649 DBusWatchToggleFunction toggle_function,
652 DBusWatchList *watches;
655 HAVE_LOCK_CHECK (connection);
657 /* This isn't really safe or reasonable; a better pattern is the "do everything, then
658 * drop lock and call out" one; but it has to be propagated up through all callers
661 watches = connection->watches;
664 connection->watches = NULL;
665 _dbus_connection_ref_unlocked (connection);
666 CONNECTION_UNLOCK (connection);
669 retval = (* add_function) (watches, watch);
670 else if (remove_function)
673 (* remove_function) (watches, watch);
678 (* toggle_function) (watches, watch, enabled);
681 CONNECTION_LOCK (connection);
682 connection->watches = watches;
683 _dbus_connection_unref_unlocked (connection);
693 * Adds a watch using the connection's DBusAddWatchFunction if
694 * available. Otherwise records the watch to be added when said
695 * function is available. Also re-adds the watch if the
696 * DBusAddWatchFunction changes. May fail due to lack of memory.
697 * Connection lock should be held when calling this.
699 * @param connection the connection.
700 * @param watch the watch to add.
701 * @returns #TRUE on success.
704 _dbus_connection_add_watch_unlocked (DBusConnection *connection,
707 return protected_change_watch (connection, watch,
708 _dbus_watch_list_add_watch,
713 * Removes a watch using the connection's DBusRemoveWatchFunction
714 * if available. It's an error to call this function on a watch
715 * that was not previously added.
716 * Connection lock should be held when calling this.
718 * @param connection the connection.
719 * @param watch the watch to remove.
722 _dbus_connection_remove_watch_unlocked (DBusConnection *connection,
725 protected_change_watch (connection, watch,
727 _dbus_watch_list_remove_watch,
732 * Toggles a watch and notifies app via connection's
733 * DBusWatchToggledFunction if available. It's an error to call this
734 * function on a watch that was not previously added.
735 * Connection lock should be held when calling this.
737 * @param connection the connection.
738 * @param watch the watch to toggle.
739 * @param enabled whether to enable or disable
742 _dbus_connection_toggle_watch_unlocked (DBusConnection *connection,
746 _dbus_assert (watch != NULL);
748 protected_change_watch (connection, watch,
750 _dbus_watch_list_toggle_watch,
754 /** Function to be called in protected_change_timeout() with refcount held */
755 typedef dbus_bool_t (* DBusTimeoutAddFunction) (DBusTimeoutList *list,
756 DBusTimeout *timeout);
757 /** Function to be called in protected_change_timeout() with refcount held */
758 typedef void (* DBusTimeoutRemoveFunction) (DBusTimeoutList *list,
759 DBusTimeout *timeout);
760 /** Function to be called in protected_change_timeout() with refcount held */
761 typedef void (* DBusTimeoutToggleFunction) (DBusTimeoutList *list,
762 DBusTimeout *timeout,
763 dbus_bool_t enabled);
766 protected_change_timeout (DBusConnection *connection,
767 DBusTimeout *timeout,
768 DBusTimeoutAddFunction add_function,
769 DBusTimeoutRemoveFunction remove_function,
770 DBusTimeoutToggleFunction toggle_function,
773 DBusTimeoutList *timeouts;
776 HAVE_LOCK_CHECK (connection);
778 /* This isn't really safe or reasonable; a better pattern is the "do everything, then
779 * drop lock and call out" one; but it has to be propagated up through all callers
782 timeouts = connection->timeouts;
785 connection->timeouts = NULL;
786 _dbus_connection_ref_unlocked (connection);
787 CONNECTION_UNLOCK (connection);
790 retval = (* add_function) (timeouts, timeout);
791 else if (remove_function)
794 (* remove_function) (timeouts, timeout);
799 (* toggle_function) (timeouts, timeout, enabled);
802 CONNECTION_LOCK (connection);
803 connection->timeouts = timeouts;
804 _dbus_connection_unref_unlocked (connection);
813 * Adds a timeout using the connection's DBusAddTimeoutFunction if
814 * available. Otherwise records the timeout to be added when said
815 * function is available. Also re-adds the timeout if the
816 * DBusAddTimeoutFunction changes. May fail due to lack of memory.
817 * The timeout will fire repeatedly until removed.
818 * Connection lock should be held when calling this.
820 * @param connection the connection.
821 * @param timeout the timeout to add.
822 * @returns #TRUE on success.
825 _dbus_connection_add_timeout_unlocked (DBusConnection *connection,
826 DBusTimeout *timeout)
828 return protected_change_timeout (connection, timeout,
829 _dbus_timeout_list_add_timeout,
834 * Removes a timeout using the connection's DBusRemoveTimeoutFunction
835 * if available. It's an error to call this function on a timeout
836 * that was not previously added.
837 * Connection lock should be held when calling this.
839 * @param connection the connection.
840 * @param timeout the timeout to remove.
843 _dbus_connection_remove_timeout_unlocked (DBusConnection *connection,
844 DBusTimeout *timeout)
846 protected_change_timeout (connection, timeout,
848 _dbus_timeout_list_remove_timeout,
853 * Toggles a timeout and notifies app via connection's
854 * DBusTimeoutToggledFunction if available. It's an error to call this
855 * function on a timeout that was not previously added.
856 * Connection lock should be held when calling this.
858 * @param connection the connection.
859 * @param timeout the timeout to toggle.
860 * @param enabled whether to enable or disable
863 _dbus_connection_toggle_timeout_unlocked (DBusConnection *connection,
864 DBusTimeout *timeout,
867 protected_change_timeout (connection, timeout,
869 _dbus_timeout_list_toggle_timeout,
874 _dbus_connection_attach_pending_call_unlocked (DBusConnection *connection,
875 DBusPendingCall *pending)
877 dbus_uint32_t reply_serial;
878 DBusTimeout *timeout;
880 HAVE_LOCK_CHECK (connection);
882 reply_serial = _dbus_pending_call_get_reply_serial_unlocked (pending);
884 _dbus_assert (reply_serial != 0);
886 timeout = _dbus_pending_call_get_timeout_unlocked (pending);
890 if (!_dbus_connection_add_timeout_unlocked (connection, timeout))
893 if (!_dbus_hash_table_insert_int (connection->pending_replies,
897 _dbus_connection_remove_timeout_unlocked (connection, timeout);
899 _dbus_pending_call_set_timeout_added_unlocked (pending, FALSE);
900 HAVE_LOCK_CHECK (connection);
904 _dbus_pending_call_set_timeout_added_unlocked (pending, TRUE);
908 if (!_dbus_hash_table_insert_int (connection->pending_replies,
912 HAVE_LOCK_CHECK (connection);
917 _dbus_pending_call_ref_unlocked (pending);
919 HAVE_LOCK_CHECK (connection);
925 free_pending_call_on_hash_removal (void *data)
927 DBusPendingCall *pending;
928 DBusConnection *connection;
935 connection = _dbus_pending_call_get_connection_unlocked (pending);
937 HAVE_LOCK_CHECK (connection);
939 if (_dbus_pending_call_is_timeout_added_unlocked (pending))
941 _dbus_connection_remove_timeout_unlocked (connection,
942 _dbus_pending_call_get_timeout_unlocked (pending));
944 _dbus_pending_call_set_timeout_added_unlocked (pending, FALSE);
947 /* FIXME 1.0? this is sort of dangerous and undesirable to drop the lock
948 * here, but the pending call finalizer could in principle call out to
949 * application code so we pretty much have to... some larger code reorg
952 _dbus_connection_ref_unlocked (connection);
953 _dbus_pending_call_unref_and_unlock (pending);
954 CONNECTION_LOCK (connection);
955 _dbus_connection_unref_unlocked (connection);
959 _dbus_connection_detach_pending_call_unlocked (DBusConnection *connection,
960 DBusPendingCall *pending)
962 /* This ends up unlocking to call the pending call finalizer, which is unexpected to
965 _dbus_hash_table_remove_int (connection->pending_replies,
966 _dbus_pending_call_get_reply_serial_unlocked (pending));
970 _dbus_connection_detach_pending_call_and_unlock (DBusConnection *connection,
971 DBusPendingCall *pending)
973 /* The idea here is to avoid finalizing the pending call
974 * with the lock held, since there's a destroy notifier
975 * in pending call that goes out to application code.
977 * There's an extra unlock inside the hash table
978 * "free pending call" function FIXME...
980 _dbus_pending_call_ref_unlocked (pending);
981 _dbus_hash_table_remove_int (connection->pending_replies,
982 _dbus_pending_call_get_reply_serial_unlocked (pending));
984 if (_dbus_pending_call_is_timeout_added_unlocked (pending))
985 _dbus_connection_remove_timeout_unlocked (connection,
986 _dbus_pending_call_get_timeout_unlocked (pending));
988 _dbus_pending_call_set_timeout_added_unlocked (pending, FALSE);
990 _dbus_pending_call_unref_and_unlock (pending);
994 * Removes a pending call from the connection, such that
995 * the pending reply will be ignored. May drop the last
996 * reference to the pending call.
998 * @param connection the connection
999 * @param pending the pending call
1002 _dbus_connection_remove_pending_call (DBusConnection *connection,
1003 DBusPendingCall *pending)
1005 CONNECTION_LOCK (connection);
1006 _dbus_connection_detach_pending_call_and_unlock (connection, pending);
1010 * Acquire the transporter I/O path. This must be done before
1011 * doing any I/O in the transporter. May sleep and drop the
1012 * IO path mutex while waiting for the I/O path.
1014 * @param connection the connection.
1015 * @param timeout_milliseconds maximum blocking time, or -1 for no limit.
1016 * @returns TRUE if the I/O path was acquired.
1019 _dbus_connection_acquire_io_path (DBusConnection *connection,
1020 int timeout_milliseconds)
1022 dbus_bool_t we_acquired;
1024 HAVE_LOCK_CHECK (connection);
1026 /* We don't want the connection to vanish */
1027 _dbus_connection_ref_unlocked (connection);
1029 /* We will only touch io_path_acquired which is protected by our mutex */
1030 CONNECTION_UNLOCK (connection);
1032 _dbus_verbose ("%s locking io_path_mutex\n", _DBUS_FUNCTION_NAME);
1033 _dbus_mutex_lock (connection->io_path_mutex);
1035 _dbus_verbose ("%s start connection->io_path_acquired = %d timeout = %d\n",
1036 _DBUS_FUNCTION_NAME, connection->io_path_acquired, timeout_milliseconds);
1038 we_acquired = FALSE;
1040 if (connection->io_path_acquired)
1042 if (timeout_milliseconds != -1)
1044 _dbus_verbose ("%s waiting %d for IO path to be acquirable\n",
1045 _DBUS_FUNCTION_NAME, timeout_milliseconds);
1047 if (!_dbus_condvar_wait_timeout (connection->io_path_cond,
1048 connection->io_path_mutex,
1049 timeout_milliseconds))
1051 /* We timed out before anyone signaled. */
1052 /* (writing the loop to handle the !timedout case by
1053 * waiting longer if needed is a pain since dbus
1054 * wraps pthread_cond_timedwait to take a relative
1055 * time instead of absolute, something kind of stupid
1056 * on our part. for now it doesn't matter, we will just
1057 * end up back here eventually.)
1063 while (connection->io_path_acquired)
1065 _dbus_verbose ("%s waiting for IO path to be acquirable\n", _DBUS_FUNCTION_NAME);
1066 _dbus_condvar_wait (connection->io_path_cond,
1067 connection->io_path_mutex);
1072 if (!connection->io_path_acquired)
1075 connection->io_path_acquired = TRUE;
1078 _dbus_verbose ("%s end connection->io_path_acquired = %d we_acquired = %d\n",
1079 _DBUS_FUNCTION_NAME, connection->io_path_acquired, we_acquired);
1081 _dbus_verbose ("%s unlocking io_path_mutex\n", _DBUS_FUNCTION_NAME);
1082 _dbus_mutex_unlock (connection->io_path_mutex);
1084 CONNECTION_LOCK (connection);
1086 HAVE_LOCK_CHECK (connection);
1088 _dbus_connection_unref_unlocked (connection);
1094 * Release the I/O path when you're done with it. Only call
1095 * after you've acquired the I/O. Wakes up at most one thread
1096 * currently waiting to acquire the I/O path.
1098 * @param connection the connection.
1101 _dbus_connection_release_io_path (DBusConnection *connection)
1103 HAVE_LOCK_CHECK (connection);
1105 _dbus_verbose ("%s locking io_path_mutex\n", _DBUS_FUNCTION_NAME);
1106 _dbus_mutex_lock (connection->io_path_mutex);
1108 _dbus_assert (connection->io_path_acquired);
1110 _dbus_verbose ("%s start connection->io_path_acquired = %d\n",
1111 _DBUS_FUNCTION_NAME, connection->io_path_acquired);
1113 connection->io_path_acquired = FALSE;
1114 _dbus_condvar_wake_one (connection->io_path_cond);
1116 _dbus_verbose ("%s unlocking io_path_mutex\n", _DBUS_FUNCTION_NAME);
1117 _dbus_mutex_unlock (connection->io_path_mutex);
1121 * Queues incoming messages and sends outgoing messages for this
1122 * connection, optionally blocking in the process. Each call to
1123 * _dbus_connection_do_iteration_unlocked() will call select() or poll() one
1124 * time and then read or write data if possible.
1126 * The purpose of this function is to be able to flush outgoing
1127 * messages or queue up incoming messages without returning
1128 * control to the application and causing reentrancy weirdness.
1130 * The flags parameter allows you to specify whether to
1131 * read incoming messages, write outgoing messages, or both,
1132 * and whether to block if no immediate action is possible.
1134 * The timeout_milliseconds parameter does nothing unless the
1135 * iteration is blocking.
1137 * If there are no outgoing messages and DBUS_ITERATION_DO_READING
1138 * wasn't specified, then it's impossible to block, even if
1139 * you specify DBUS_ITERATION_BLOCK; in that case the function
1140 * returns immediately.
1142 * If pending is not NULL then a check is made if the pending call
1143 * is completed after the io path has been required. If the call
1144 * has been completed nothing is done. This must be done since
1145 * the _dbus_connection_acquire_io_path releases the connection
1148 * Called with connection lock held.
1150 * @param connection the connection.
1151 * @param pending the pending call that should be checked or NULL
1152 * @param flags iteration flags.
1153 * @param timeout_milliseconds maximum blocking time, or -1 for no limit.
1156 _dbus_connection_do_iteration_unlocked (DBusConnection *connection,
1157 DBusPendingCall *pending,
1159 int timeout_milliseconds)
1161 _dbus_verbose ("%s start\n", _DBUS_FUNCTION_NAME);
1163 HAVE_LOCK_CHECK (connection);
1165 if (connection->n_outgoing == 0)
1166 flags &= ~DBUS_ITERATION_DO_WRITING;
1168 if (_dbus_connection_acquire_io_path (connection,
1169 (flags & DBUS_ITERATION_BLOCK) ? timeout_milliseconds : 0))
1171 HAVE_LOCK_CHECK (connection);
1173 if ( (pending != NULL) && _dbus_pending_call_get_completed_unlocked(pending))
1175 _dbus_verbose ("pending call completed while acquiring I/O path");
1177 else if ( (pending != NULL) &&
1178 _dbus_connection_peek_for_reply_unlocked (connection,
1179 _dbus_pending_call_get_reply_serial_unlocked (pending)))
1181 _dbus_verbose ("pending call completed while acquiring I/O path (reply found in queue)");
1185 _dbus_transport_do_iteration (connection->transport,
1186 flags, timeout_milliseconds);
1189 _dbus_connection_release_io_path (connection);
1192 HAVE_LOCK_CHECK (connection);
1194 _dbus_verbose ("%s end\n", _DBUS_FUNCTION_NAME);
1198 * Creates a new connection for the given transport. A transport
1199 * represents a message stream that uses some concrete mechanism, such
1200 * as UNIX domain sockets. May return #NULL if insufficient
1201 * memory exists to create the connection.
1203 * @param transport the transport.
1204 * @returns the new connection, or #NULL on failure.
1207 _dbus_connection_new_for_transport (DBusTransport *transport)
1209 DBusConnection *connection;
1210 DBusWatchList *watch_list;
1211 DBusTimeoutList *timeout_list;
1212 DBusHashTable *pending_replies;
1213 DBusList *disconnect_link;
1214 DBusMessage *disconnect_message;
1215 DBusCounter *outgoing_counter;
1216 DBusObjectTree *objects;
1220 pending_replies = NULL;
1221 timeout_list = NULL;
1222 disconnect_link = NULL;
1223 disconnect_message = NULL;
1224 outgoing_counter = NULL;
1227 watch_list = _dbus_watch_list_new ();
1228 if (watch_list == NULL)
1231 timeout_list = _dbus_timeout_list_new ();
1232 if (timeout_list == NULL)
1236 _dbus_hash_table_new (DBUS_HASH_INT,
1238 (DBusFreeFunction)free_pending_call_on_hash_removal);
1239 if (pending_replies == NULL)
1242 connection = dbus_new0 (DBusConnection, 1);
1243 if (connection == NULL)
1246 _dbus_mutex_new_at_location (&connection->mutex);
1247 if (connection->mutex == NULL)
1250 _dbus_mutex_new_at_location (&connection->io_path_mutex);
1251 if (connection->io_path_mutex == NULL)
1254 _dbus_mutex_new_at_location (&connection->dispatch_mutex);
1255 if (connection->dispatch_mutex == NULL)
1258 _dbus_condvar_new_at_location (&connection->dispatch_cond);
1259 if (connection->dispatch_cond == NULL)
1262 _dbus_condvar_new_at_location (&connection->io_path_cond);
1263 if (connection->io_path_cond == NULL)
1266 disconnect_message = dbus_message_new_signal (DBUS_PATH_LOCAL,
1267 DBUS_INTERFACE_LOCAL,
1270 if (disconnect_message == NULL)
1273 disconnect_link = _dbus_list_alloc_link (disconnect_message);
1274 if (disconnect_link == NULL)
1277 outgoing_counter = _dbus_counter_new ();
1278 if (outgoing_counter == NULL)
1281 objects = _dbus_object_tree_new (connection);
1282 if (objects == NULL)
1285 if (_dbus_modify_sigpipe)
1286 _dbus_disable_sigpipe ();
1288 connection->refcount.value = 1;
1289 connection->transport = transport;
1290 connection->watches = watch_list;
1291 connection->timeouts = timeout_list;
1292 connection->pending_replies = pending_replies;
1293 connection->outgoing_counter = outgoing_counter;
1294 connection->filter_list = NULL;
1295 connection->last_dispatch_status = DBUS_DISPATCH_COMPLETE; /* so we're notified first time there's data */
1296 connection->objects = objects;
1297 connection->exit_on_disconnect = FALSE;
1298 connection->shareable = FALSE;
1299 connection->route_peer_messages = FALSE;
1300 connection->disconnected_message_arrived = FALSE;
1301 connection->disconnected_message_processed = FALSE;
1303 #ifndef DBUS_DISABLE_CHECKS
1304 connection->generation = _dbus_current_generation;
1307 _dbus_data_slot_list_init (&connection->slot_list);
1309 connection->client_serial = 1;
1311 connection->disconnect_message_link = disconnect_link;
1313 CONNECTION_LOCK (connection);
1315 if (!_dbus_transport_set_connection (transport, connection))
1317 CONNECTION_UNLOCK (connection);
1322 _dbus_transport_ref (transport);
1324 CONNECTION_UNLOCK (connection);
1329 if (disconnect_message != NULL)
1330 dbus_message_unref (disconnect_message);
1332 if (disconnect_link != NULL)
1333 _dbus_list_free_link (disconnect_link);
1335 if (connection != NULL)
1337 _dbus_condvar_free_at_location (&connection->io_path_cond);
1338 _dbus_condvar_free_at_location (&connection->dispatch_cond);
1339 _dbus_mutex_free_at_location (&connection->mutex);
1340 _dbus_mutex_free_at_location (&connection->io_path_mutex);
1341 _dbus_mutex_free_at_location (&connection->dispatch_mutex);
1342 dbus_free (connection);
1344 if (pending_replies)
1345 _dbus_hash_table_unref (pending_replies);
1348 _dbus_watch_list_free (watch_list);
1351 _dbus_timeout_list_free (timeout_list);
1353 if (outgoing_counter)
1354 _dbus_counter_unref (outgoing_counter);
1357 _dbus_object_tree_unref (objects);
1363 * Increments the reference count of a DBusConnection.
1364 * Requires that the caller already holds the connection lock.
1366 * @param connection the connection.
1367 * @returns the connection.
1370 _dbus_connection_ref_unlocked (DBusConnection *connection)
1372 _dbus_assert (connection != NULL);
1373 _dbus_assert (connection->generation == _dbus_current_generation);
1375 HAVE_LOCK_CHECK (connection);
1377 #ifdef DBUS_HAVE_ATOMIC_INT
1378 _dbus_atomic_inc (&connection->refcount);
1380 _dbus_assert (connection->refcount.value > 0);
1381 connection->refcount.value += 1;
1388 * Decrements the reference count of a DBusConnection.
1389 * Requires that the caller already holds the connection lock.
1391 * @param connection the connection.
1394 _dbus_connection_unref_unlocked (DBusConnection *connection)
1396 dbus_bool_t last_unref;
1398 HAVE_LOCK_CHECK (connection);
1400 _dbus_assert (connection != NULL);
1402 /* The connection lock is better than the global
1403 * lock in the atomic increment fallback
1406 #ifdef DBUS_HAVE_ATOMIC_INT
1407 last_unref = (_dbus_atomic_dec (&connection->refcount) == 1);
1409 _dbus_assert (connection->refcount.value > 0);
1411 connection->refcount.value -= 1;
1412 last_unref = (connection->refcount.value == 0);
1414 printf ("unref_unlocked() connection %p count = %d\n", connection, connection->refcount.value);
1419 _dbus_connection_last_unref (connection);
1422 static dbus_uint32_t
1423 _dbus_connection_get_next_client_serial (DBusConnection *connection)
1425 dbus_uint32_t serial;
1427 serial = connection->client_serial++;
1429 if (connection->client_serial == 0)
1430 connection->client_serial = 1;
1436 * A callback for use with dbus_watch_new() to create a DBusWatch.
1438 * @todo This is basically a hack - we could delete _dbus_transport_handle_watch()
1439 * and the virtual handle_watch in DBusTransport if we got rid of it.
1440 * The reason this is some work is threading, see the _dbus_connection_handle_watch()
1443 * @param watch the watch.
1444 * @param condition the current condition of the file descriptors being watched.
1445 * @param data must be a pointer to a #DBusConnection
1446 * @returns #FALSE if the IO condition may not have been fully handled due to lack of memory
1449 _dbus_connection_handle_watch (DBusWatch *watch,
1450 unsigned int condition,
1453 DBusConnection *connection;
1455 DBusDispatchStatus status;
1459 _dbus_verbose ("%s start\n", _DBUS_FUNCTION_NAME);
1461 CONNECTION_LOCK (connection);
1463 if (!_dbus_connection_acquire_io_path (connection, 1))
1465 /* another thread is handling the message */
1466 CONNECTION_UNLOCK (connection);
1470 HAVE_LOCK_CHECK (connection);
1471 retval = _dbus_transport_handle_watch (connection->transport,
1474 _dbus_connection_release_io_path (connection);
1476 HAVE_LOCK_CHECK (connection);
1478 _dbus_verbose ("%s middle\n", _DBUS_FUNCTION_NAME);
1480 status = _dbus_connection_get_dispatch_status_unlocked (connection);
1482 /* this calls out to user code */
1483 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
1485 _dbus_verbose ("%s end\n", _DBUS_FUNCTION_NAME);
1490 _DBUS_DEFINE_GLOBAL_LOCK (shared_connections);
1491 static DBusHashTable *shared_connections = NULL;
1492 static DBusList *shared_connections_no_guid = NULL;
1495 close_connection_on_shutdown (DBusConnection *connection)
1497 DBusMessage *message;
1499 dbus_connection_ref (connection);
1500 _dbus_connection_close_possibly_shared (connection);
1502 /* Churn through to the Disconnected message */
1503 while ((message = dbus_connection_pop_message (connection)))
1505 dbus_message_unref (message);
1507 dbus_connection_unref (connection);
1511 shared_connections_shutdown (void *data)
1515 _DBUS_LOCK (shared_connections);
1517 /* This is a little bit unpleasant... better ideas? */
1518 while ((n_entries = _dbus_hash_table_get_n_entries (shared_connections)) > 0)
1520 DBusConnection *connection;
1523 _dbus_hash_iter_init (shared_connections, &iter);
1524 _dbus_hash_iter_next (&iter);
1526 connection = _dbus_hash_iter_get_value (&iter);
1528 _DBUS_UNLOCK (shared_connections);
1529 close_connection_on_shutdown (connection);
1530 _DBUS_LOCK (shared_connections);
1532 /* The connection should now be dead and not in our hash ... */
1533 _dbus_assert (_dbus_hash_table_get_n_entries (shared_connections) < n_entries);
1536 _dbus_assert (_dbus_hash_table_get_n_entries (shared_connections) == 0);
1538 _dbus_hash_table_unref (shared_connections);
1539 shared_connections = NULL;
1541 if (shared_connections_no_guid != NULL)
1543 DBusConnection *connection;
1544 connection = _dbus_list_pop_first (&shared_connections_no_guid);
1545 while (connection != NULL)
1547 _DBUS_UNLOCK (shared_connections);
1548 close_connection_on_shutdown (connection);
1549 _DBUS_LOCK (shared_connections);
1550 connection = _dbus_list_pop_first (&shared_connections_no_guid);
1554 shared_connections_no_guid = NULL;
1556 _DBUS_UNLOCK (shared_connections);
1560 connection_lookup_shared (DBusAddressEntry *entry,
1561 DBusConnection **result)
1563 _dbus_verbose ("checking for existing connection\n");
1567 _DBUS_LOCK (shared_connections);
1569 if (shared_connections == NULL)
1571 _dbus_verbose ("creating shared_connections hash table\n");
1573 shared_connections = _dbus_hash_table_new (DBUS_HASH_STRING,
1576 if (shared_connections == NULL)
1578 _DBUS_UNLOCK (shared_connections);
1582 if (!_dbus_register_shutdown_func (shared_connections_shutdown, NULL))
1584 _dbus_hash_table_unref (shared_connections);
1585 shared_connections = NULL;
1586 _DBUS_UNLOCK (shared_connections);
1590 _dbus_verbose (" successfully created shared_connections\n");
1592 _DBUS_UNLOCK (shared_connections);
1593 return TRUE; /* no point looking up in the hash we just made */
1599 guid = dbus_address_entry_get_value (entry, "guid");
1603 DBusConnection *connection;
1605 connection = _dbus_hash_table_lookup_string (shared_connections,
1610 /* The DBusConnection can't be finalized without taking
1611 * the shared_connections lock to remove it from the
1612 * hash. So it's safe to ref the connection here.
1613 * However, it may be disconnected if the Disconnected
1614 * message hasn't been processed yet, in which case we
1615 * want to pretend it isn't in the hash and avoid
1618 * The idea is to avoid ever returning a disconnected connection
1619 * from dbus_connection_open(). We could just synchronously
1620 * drop our shared ref to the connection on connection disconnect,
1621 * and then assert here that the connection is connected, but
1622 * that causes reentrancy headaches.
1624 CONNECTION_LOCK (connection);
1625 if (_dbus_connection_get_is_connected_unlocked (connection))
1627 _dbus_connection_ref_unlocked (connection);
1628 *result = connection;
1629 _dbus_verbose ("looked up existing connection to server guid %s\n",
1634 _dbus_verbose ("looked up existing connection to server guid %s but it was disconnected so ignoring it\n",
1637 CONNECTION_UNLOCK (connection);
1641 _DBUS_UNLOCK (shared_connections);
1647 connection_record_shared_unlocked (DBusConnection *connection,
1651 char *guid_in_connection;
1653 HAVE_LOCK_CHECK (connection);
1654 _dbus_assert (connection->server_guid == NULL);
1655 _dbus_assert (connection->shareable);
1657 /* get a hard ref on this connection, even if
1658 * we won't in fact store it in the hash, we still
1659 * need to hold a ref on it until it's disconnected.
1661 _dbus_connection_ref_unlocked (connection);
1665 _DBUS_LOCK (shared_connections);
1667 if (!_dbus_list_prepend (&shared_connections_no_guid, connection))
1669 _DBUS_UNLOCK (shared_connections);
1673 _DBUS_UNLOCK (shared_connections);
1674 return TRUE; /* don't store in the hash */
1677 /* A separate copy of the key is required in the hash table, because
1678 * we don't have a lock on the connection when we are doing a hash
1682 guid_key = _dbus_strdup (guid);
1683 if (guid_key == NULL)
1686 guid_in_connection = _dbus_strdup (guid);
1687 if (guid_in_connection == NULL)
1689 dbus_free (guid_key);
1693 _DBUS_LOCK (shared_connections);
1694 _dbus_assert (shared_connections != NULL);
1696 if (!_dbus_hash_table_insert_string (shared_connections,
1697 guid_key, connection))
1699 dbus_free (guid_key);
1700 dbus_free (guid_in_connection);
1701 _DBUS_UNLOCK (shared_connections);
1705 connection->server_guid = guid_in_connection;
1707 _dbus_verbose ("stored connection to %s to be shared\n",
1708 connection->server_guid);
1710 _DBUS_UNLOCK (shared_connections);
1712 _dbus_assert (connection->server_guid != NULL);
1718 connection_forget_shared_unlocked (DBusConnection *connection)
1720 HAVE_LOCK_CHECK (connection);
1722 if (!connection->shareable)
1725 _DBUS_LOCK (shared_connections);
1727 if (connection->server_guid != NULL)
1729 _dbus_verbose ("dropping connection to %s out of the shared table\n",
1730 connection->server_guid);
1732 if (!_dbus_hash_table_remove_string (shared_connections,
1733 connection->server_guid))
1734 _dbus_assert_not_reached ("connection was not in the shared table");
1736 dbus_free (connection->server_guid);
1737 connection->server_guid = NULL;
1741 _dbus_list_remove (&shared_connections_no_guid, connection);
1744 _DBUS_UNLOCK (shared_connections);
1746 /* remove our reference held on all shareable connections */
1747 _dbus_connection_unref_unlocked (connection);
1750 static DBusConnection*
1751 connection_try_from_address_entry (DBusAddressEntry *entry,
1754 DBusTransport *transport;
1755 DBusConnection *connection;
1757 transport = _dbus_transport_open (entry, error);
1759 if (transport == NULL)
1761 _DBUS_ASSERT_ERROR_IS_SET (error);
1765 connection = _dbus_connection_new_for_transport (transport);
1767 _dbus_transport_unref (transport);
1769 if (connection == NULL)
1771 _DBUS_SET_OOM (error);
1775 #ifndef DBUS_DISABLE_CHECKS
1776 _dbus_assert (!connection->have_connection_lock);
1782 * If the shared parameter is true, then any existing connection will
1783 * be used (and if a new connection is created, it will be available
1784 * for use by others). If the shared parameter is false, a new
1785 * connection will always be created, and the new connection will
1786 * never be returned to other callers.
1788 * @param address the address
1789 * @param shared whether the connection is shared or private
1790 * @param error error return
1791 * @returns the connection or #NULL on error
1793 static DBusConnection*
1794 _dbus_connection_open_internal (const char *address,
1798 DBusConnection *connection;
1799 DBusAddressEntry **entries;
1800 DBusError tmp_error = DBUS_ERROR_INIT;
1801 DBusError first_error = DBUS_ERROR_INIT;
1804 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1806 _dbus_verbose ("opening %s connection to: %s\n",
1807 shared ? "shared" : "private", address);
1809 if (!dbus_parse_address (address, &entries, &len, error))
1812 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1816 for (i = 0; i < len; i++)
1820 if (!connection_lookup_shared (entries[i], &connection))
1821 _DBUS_SET_OOM (&tmp_error);
1824 if (connection == NULL)
1826 connection = connection_try_from_address_entry (entries[i],
1829 if (connection != NULL && shared)
1833 connection->shareable = TRUE;
1835 /* guid may be NULL */
1836 guid = dbus_address_entry_get_value (entries[i], "guid");
1838 CONNECTION_LOCK (connection);
1840 if (!connection_record_shared_unlocked (connection, guid))
1842 _DBUS_SET_OOM (&tmp_error);
1843 _dbus_connection_close_possibly_shared_and_unlock (connection);
1844 dbus_connection_unref (connection);
1848 CONNECTION_UNLOCK (connection);
1855 _DBUS_ASSERT_ERROR_IS_SET (&tmp_error);
1858 dbus_move_error (&tmp_error, &first_error);
1860 dbus_error_free (&tmp_error);
1863 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1864 _DBUS_ASSERT_ERROR_IS_CLEAR (&tmp_error);
1866 if (connection == NULL)
1868 _DBUS_ASSERT_ERROR_IS_SET (&first_error);
1869 dbus_move_error (&first_error, error);
1872 dbus_error_free (&first_error);
1874 dbus_address_entries_free (entries);
1879 * Closes a shared OR private connection, while dbus_connection_close() can
1880 * only be used on private connections. Should only be called by the
1881 * dbus code that owns the connection - an owner must be known,
1882 * the open/close state is like malloc/free, not like ref/unref.
1884 * @param connection the connection
1887 _dbus_connection_close_possibly_shared (DBusConnection *connection)
1889 _dbus_assert (connection != NULL);
1890 _dbus_assert (connection->generation == _dbus_current_generation);
1892 CONNECTION_LOCK (connection);
1893 _dbus_connection_close_possibly_shared_and_unlock (connection);
1896 static DBusPreallocatedSend*
1897 _dbus_connection_preallocate_send_unlocked (DBusConnection *connection)
1899 DBusPreallocatedSend *preallocated;
1901 HAVE_LOCK_CHECK (connection);
1903 _dbus_assert (connection != NULL);
1905 preallocated = dbus_new (DBusPreallocatedSend, 1);
1906 if (preallocated == NULL)
1909 if (connection->link_cache != NULL)
1911 preallocated->queue_link =
1912 _dbus_list_pop_first_link (&connection->link_cache);
1913 preallocated->queue_link->data = NULL;
1917 preallocated->queue_link = _dbus_list_alloc_link (NULL);
1918 if (preallocated->queue_link == NULL)
1922 if (connection->link_cache != NULL)
1924 preallocated->counter_link =
1925 _dbus_list_pop_first_link (&connection->link_cache);
1926 preallocated->counter_link->data = connection->outgoing_counter;
1930 preallocated->counter_link = _dbus_list_alloc_link (connection->outgoing_counter);
1931 if (preallocated->counter_link == NULL)
1935 _dbus_counter_ref (preallocated->counter_link->data);
1937 preallocated->connection = connection;
1939 return preallocated;
1942 _dbus_list_free_link (preallocated->queue_link);
1944 dbus_free (preallocated);
1949 /* Called with lock held, does not update dispatch status */
1951 _dbus_connection_send_preallocated_unlocked_no_update (DBusConnection *connection,
1952 DBusPreallocatedSend *preallocated,
1953 DBusMessage *message,
1954 dbus_uint32_t *client_serial)
1956 dbus_uint32_t serial;
1959 preallocated->queue_link->data = message;
1960 _dbus_list_prepend_link (&connection->outgoing_messages,
1961 preallocated->queue_link);
1963 _dbus_message_add_size_counter_link (message,
1964 preallocated->counter_link);
1966 dbus_free (preallocated);
1967 preallocated = NULL;
1969 dbus_message_ref (message);
1971 connection->n_outgoing += 1;
1973 sig = dbus_message_get_signature (message);
1975 _dbus_verbose ("Message %p (%d %s %s %s '%s') for %s added to outgoing queue %p, %d pending to send\n",
1977 dbus_message_get_type (message),
1978 dbus_message_get_path (message) ?
1979 dbus_message_get_path (message) :
1981 dbus_message_get_interface (message) ?
1982 dbus_message_get_interface (message) :
1984 dbus_message_get_member (message) ?
1985 dbus_message_get_member (message) :
1988 dbus_message_get_destination (message) ?
1989 dbus_message_get_destination (message) :
1992 connection->n_outgoing);
1994 if (dbus_message_get_serial (message) == 0)
1996 serial = _dbus_connection_get_next_client_serial (connection);
1997 dbus_message_set_serial (message, serial);
1999 *client_serial = serial;
2004 *client_serial = dbus_message_get_serial (message);
2007 _dbus_verbose ("Message %p serial is %u\n",
2008 message, dbus_message_get_serial (message));
2010 dbus_message_lock (message);
2012 /* Now we need to run an iteration to hopefully just write the messages
2013 * out immediately, and otherwise get them queued up
2015 _dbus_connection_do_iteration_unlocked (connection,
2017 DBUS_ITERATION_DO_WRITING,
2020 /* If stuff is still queued up, be sure we wake up the main loop */
2021 if (connection->n_outgoing > 0)
2022 _dbus_connection_wakeup_mainloop (connection);
2026 _dbus_connection_send_preallocated_and_unlock (DBusConnection *connection,
2027 DBusPreallocatedSend *preallocated,
2028 DBusMessage *message,
2029 dbus_uint32_t *client_serial)
2031 DBusDispatchStatus status;
2033 HAVE_LOCK_CHECK (connection);
2035 _dbus_connection_send_preallocated_unlocked_no_update (connection,
2037 message, client_serial);
2039 _dbus_verbose ("%s middle\n", _DBUS_FUNCTION_NAME);
2040 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2042 /* this calls out to user code */
2043 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2047 * Like dbus_connection_send(), but assumes the connection
2048 * is already locked on function entry, and unlocks before returning.
2050 * @param connection the connection
2051 * @param message the message to send
2052 * @param client_serial return location for client serial of sent message
2053 * @returns #FALSE on out-of-memory
2056 _dbus_connection_send_and_unlock (DBusConnection *connection,
2057 DBusMessage *message,
2058 dbus_uint32_t *client_serial)
2060 DBusPreallocatedSend *preallocated;
2062 _dbus_assert (connection != NULL);
2063 _dbus_assert (message != NULL);
2065 preallocated = _dbus_connection_preallocate_send_unlocked (connection);
2066 if (preallocated == NULL)
2068 CONNECTION_UNLOCK (connection);
2072 _dbus_connection_send_preallocated_and_unlock (connection,
2080 * Used internally to handle the semantics of dbus_server_set_new_connection_function().
2081 * If the new connection function does not ref the connection, we want to close it.
2083 * A bit of a hack, probably the new connection function should have returned a value
2084 * for whether to close, or should have had to close the connection itself if it
2087 * But, this works OK as long as the new connection function doesn't do anything
2088 * crazy like keep the connection around without ref'ing it.
2090 * We have to lock the connection across refcount check and close in case
2091 * the new connection function spawns a thread that closes and unrefs.
2092 * In that case, if the app thread
2093 * closes and unrefs first, we'll harmlessly close again; if the app thread
2094 * still has the ref, we'll close and then the app will close harmlessly.
2095 * If the app unrefs without closing, the app is broken since if the
2096 * app refs from the new connection function it is supposed to also close.
2098 * If we didn't atomically check the refcount and close with the lock held
2099 * though, we could screw this up.
2101 * @param connection the connection
2104 _dbus_connection_close_if_only_one_ref (DBusConnection *connection)
2106 CONNECTION_LOCK (connection);
2108 _dbus_assert (connection->refcount.value > 0);
2110 if (connection->refcount.value == 1)
2111 _dbus_connection_close_possibly_shared_and_unlock (connection);
2113 CONNECTION_UNLOCK (connection);
2118 * When a function that blocks has been called with a timeout, and we
2119 * run out of memory, the time to wait for memory is based on the
2120 * timeout. If the caller was willing to block a long time we wait a
2121 * relatively long time for memory, if they were only willing to block
2122 * briefly then we retry for memory at a rapid rate.
2124 * @timeout_milliseconds the timeout requested for blocking
2127 _dbus_memory_pause_based_on_timeout (int timeout_milliseconds)
2129 if (timeout_milliseconds == -1)
2130 _dbus_sleep_milliseconds (1000);
2131 else if (timeout_milliseconds < 100)
2132 ; /* just busy loop */
2133 else if (timeout_milliseconds <= 1000)
2134 _dbus_sleep_milliseconds (timeout_milliseconds / 3);
2136 _dbus_sleep_milliseconds (1000);
2139 static DBusMessage *
2140 generate_local_error_message (dbus_uint32_t serial,
2144 DBusMessage *message;
2145 message = dbus_message_new (DBUS_MESSAGE_TYPE_ERROR);
2149 if (!dbus_message_set_error_name (message, error_name))
2151 dbus_message_unref (message);
2156 dbus_message_set_no_reply (message, TRUE);
2158 if (!dbus_message_set_reply_serial (message,
2161 dbus_message_unref (message);
2166 if (error_msg != NULL)
2168 DBusMessageIter iter;
2170 dbus_message_iter_init_append (message, &iter);
2171 if (!dbus_message_iter_append_basic (&iter,
2175 dbus_message_unref (message);
2186 * Peek the incoming queue to see if we got reply for a specific serial
2189 _dbus_connection_peek_for_reply_unlocked (DBusConnection *connection,
2190 dbus_uint32_t client_serial)
2193 HAVE_LOCK_CHECK (connection);
2195 link = _dbus_list_get_first_link (&connection->incoming_messages);
2197 while (link != NULL)
2199 DBusMessage *reply = link->data;
2201 if (dbus_message_get_reply_serial (reply) == client_serial)
2203 _dbus_verbose ("%s reply to %d found in queue\n", _DBUS_FUNCTION_NAME, client_serial);
2206 link = _dbus_list_get_next_link (&connection->incoming_messages, link);
2212 /* This is slightly strange since we can pop a message here without
2213 * the dispatch lock.
2216 check_for_reply_unlocked (DBusConnection *connection,
2217 dbus_uint32_t client_serial)
2221 HAVE_LOCK_CHECK (connection);
2223 link = _dbus_list_get_first_link (&connection->incoming_messages);
2225 while (link != NULL)
2227 DBusMessage *reply = link->data;
2229 if (dbus_message_get_reply_serial (reply) == client_serial)
2231 _dbus_list_remove_link (&connection->incoming_messages, link);
2232 connection->n_incoming -= 1;
2235 link = _dbus_list_get_next_link (&connection->incoming_messages, link);
2242 connection_timeout_and_complete_all_pending_calls_unlocked (DBusConnection *connection)
2244 /* We can't iterate over the hash in the normal way since we'll be
2245 * dropping the lock for each item. So we restart the
2246 * iter each time as we drain the hash table.
2249 while (_dbus_hash_table_get_n_entries (connection->pending_replies) > 0)
2251 DBusPendingCall *pending;
2254 _dbus_hash_iter_init (connection->pending_replies, &iter);
2255 _dbus_hash_iter_next (&iter);
2257 pending = _dbus_hash_iter_get_value (&iter);
2258 _dbus_pending_call_ref_unlocked (pending);
2260 _dbus_pending_call_queue_timeout_error_unlocked (pending,
2263 if (_dbus_pending_call_is_timeout_added_unlocked (pending))
2264 _dbus_connection_remove_timeout_unlocked (connection,
2265 _dbus_pending_call_get_timeout_unlocked (pending));
2266 _dbus_pending_call_set_timeout_added_unlocked (pending, FALSE);
2267 _dbus_hash_iter_remove_entry (&iter);
2269 _dbus_pending_call_unref_and_unlock (pending);
2270 CONNECTION_LOCK (connection);
2272 HAVE_LOCK_CHECK (connection);
2276 complete_pending_call_and_unlock (DBusConnection *connection,
2277 DBusPendingCall *pending,
2278 DBusMessage *message)
2280 _dbus_pending_call_set_reply_unlocked (pending, message);
2281 _dbus_pending_call_ref_unlocked (pending); /* in case there's no app with a ref held */
2282 _dbus_connection_detach_pending_call_and_unlock (connection, pending);
2284 /* Must be called unlocked since it invokes app callback */
2285 _dbus_pending_call_complete (pending);
2286 dbus_pending_call_unref (pending);
2290 check_for_reply_and_update_dispatch_unlocked (DBusConnection *connection,
2291 DBusPendingCall *pending)
2294 DBusDispatchStatus status;
2296 reply = check_for_reply_unlocked (connection,
2297 _dbus_pending_call_get_reply_serial_unlocked (pending));
2300 _dbus_verbose ("%s checked for reply\n", _DBUS_FUNCTION_NAME);
2302 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): got reply\n");
2304 complete_pending_call_and_unlock (connection, pending, reply);
2305 dbus_message_unref (reply);
2307 CONNECTION_LOCK (connection);
2308 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2309 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2310 dbus_pending_call_unref (pending);
2319 * Blocks until a pending call times out or gets a reply.
2321 * Does not re-enter the main loop or run filter/path-registered
2322 * callbacks. The reply to the message will not be seen by
2325 * Returns immediately if pending call already got a reply.
2327 * @todo could use performance improvements (it keeps scanning
2328 * the whole message queue for example)
2330 * @param pending the pending call we block for a reply on
2333 _dbus_connection_block_pending_call (DBusPendingCall *pending)
2335 long start_tv_sec, start_tv_usec;
2336 long tv_sec, tv_usec;
2337 DBusDispatchStatus status;
2338 DBusConnection *connection;
2339 dbus_uint32_t client_serial;
2340 DBusTimeout *timeout;
2341 int timeout_milliseconds, elapsed_milliseconds;
2343 _dbus_assert (pending != NULL);
2345 if (dbus_pending_call_get_completed (pending))
2348 dbus_pending_call_ref (pending); /* necessary because the call could be canceled */
2350 connection = _dbus_pending_call_get_connection_and_lock (pending);
2352 /* Flush message queue - note, can affect dispatch status */
2353 _dbus_connection_flush_unlocked (connection);
2355 client_serial = _dbus_pending_call_get_reply_serial_unlocked (pending);
2357 /* note that timeout_milliseconds is limited to a smallish value
2358 * in _dbus_pending_call_new() so overflows aren't possible
2361 timeout = _dbus_pending_call_get_timeout_unlocked (pending);
2364 timeout_milliseconds = dbus_timeout_get_interval (timeout);
2365 _dbus_get_current_time (&start_tv_sec, &start_tv_usec);
2367 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): will block %d milliseconds for reply serial %u from %ld sec %ld usec\n",
2368 timeout_milliseconds,
2370 start_tv_sec, start_tv_usec);
2374 timeout_milliseconds = -1;
2376 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): will block for reply serial %u\n", client_serial);
2379 /* check to see if we already got the data off the socket */
2380 /* from another blocked pending call */
2381 if (check_for_reply_and_update_dispatch_unlocked (connection, pending))
2384 /* Now we wait... */
2385 /* always block at least once as we know we don't have the reply yet */
2386 _dbus_connection_do_iteration_unlocked (connection,
2388 DBUS_ITERATION_DO_READING |
2389 DBUS_ITERATION_BLOCK,
2390 timeout_milliseconds);
2394 _dbus_verbose ("%s top of recheck\n", _DBUS_FUNCTION_NAME);
2396 HAVE_LOCK_CHECK (connection);
2398 /* queue messages and get status */
2400 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2402 /* the get_completed() is in case a dispatch() while we were blocking
2403 * got the reply instead of us.
2405 if (_dbus_pending_call_get_completed_unlocked (pending))
2407 _dbus_verbose ("Pending call completed by dispatch in %s\n", _DBUS_FUNCTION_NAME);
2408 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2409 dbus_pending_call_unref (pending);
2413 if (status == DBUS_DISPATCH_DATA_REMAINS)
2415 if (check_for_reply_and_update_dispatch_unlocked (connection, pending))
2419 _dbus_get_current_time (&tv_sec, &tv_usec);
2420 elapsed_milliseconds = (tv_sec - start_tv_sec) * 1000 +
2421 (tv_usec - start_tv_usec) / 1000;
2423 if (!_dbus_connection_get_is_connected_unlocked (connection))
2425 DBusMessage *error_msg;
2427 error_msg = generate_local_error_message (client_serial,
2428 DBUS_ERROR_DISCONNECTED,
2429 "Connection was disconnected before a reply was received");
2431 /* on OOM error_msg is set to NULL */
2432 complete_pending_call_and_unlock (connection, pending, error_msg);
2433 dbus_pending_call_unref (pending);
2436 else if (connection->disconnect_message_link == NULL)
2437 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): disconnected\n");
2438 else if (timeout == NULL)
2440 if (status == DBUS_DISPATCH_NEED_MEMORY)
2442 /* Try sleeping a bit, as we aren't sure we need to block for reading,
2443 * we may already have a reply in the buffer and just can't process
2446 _dbus_verbose ("dbus_connection_send_with_reply_and_block() waiting for more memory\n");
2448 _dbus_memory_pause_based_on_timeout (timeout_milliseconds - elapsed_milliseconds);
2452 /* block again, we don't have the reply buffered yet. */
2453 _dbus_connection_do_iteration_unlocked (connection,
2455 DBUS_ITERATION_DO_READING |
2456 DBUS_ITERATION_BLOCK,
2457 timeout_milliseconds - elapsed_milliseconds);
2460 goto recheck_status;
2462 else if (tv_sec < start_tv_sec)
2463 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): clock set backward\n");
2464 else if (elapsed_milliseconds < timeout_milliseconds)
2466 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): %d milliseconds remain\n", timeout_milliseconds - elapsed_milliseconds);
2468 if (status == DBUS_DISPATCH_NEED_MEMORY)
2470 /* Try sleeping a bit, as we aren't sure we need to block for reading,
2471 * we may already have a reply in the buffer and just can't process
2474 _dbus_verbose ("dbus_connection_send_with_reply_and_block() waiting for more memory\n");
2476 _dbus_memory_pause_based_on_timeout (timeout_milliseconds - elapsed_milliseconds);
2480 /* block again, we don't have the reply buffered yet. */
2481 _dbus_connection_do_iteration_unlocked (connection,
2483 DBUS_ITERATION_DO_READING |
2484 DBUS_ITERATION_BLOCK,
2485 timeout_milliseconds - elapsed_milliseconds);
2488 goto recheck_status;
2491 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): Waited %d milliseconds and got no reply\n",
2492 elapsed_milliseconds);
2494 _dbus_assert (!_dbus_pending_call_get_completed_unlocked (pending));
2496 /* unlock and call user code */
2497 complete_pending_call_and_unlock (connection, pending, NULL);
2499 /* update user code on dispatch status */
2500 CONNECTION_LOCK (connection);
2501 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2502 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2503 dbus_pending_call_unref (pending);
2509 * @addtogroup DBusConnection
2515 * Gets a connection to a remote address. If a connection to the given
2516 * address already exists, returns the existing connection with its
2517 * reference count incremented. Otherwise, returns a new connection
2518 * and saves the new connection for possible re-use if a future call
2519 * to dbus_connection_open() asks to connect to the same server.
2521 * Use dbus_connection_open_private() to get a dedicated connection
2522 * not shared with other callers of dbus_connection_open().
2524 * If the open fails, the function returns #NULL, and provides a
2525 * reason for the failure in the error parameter. Pass #NULL for the
2526 * error parameter if you aren't interested in the reason for
2529 * Because this connection is shared, no user of the connection
2530 * may call dbus_connection_close(). However, when you are done with the
2531 * connection you should call dbus_connection_unref().
2533 * @note Prefer dbus_connection_open() to dbus_connection_open_private()
2534 * unless you have good reason; connections are expensive enough
2535 * that it's wasteful to create lots of connections to the same
2538 * @param address the address.
2539 * @param error address where an error can be returned.
2540 * @returns new connection, or #NULL on failure.
2543 dbus_connection_open (const char *address,
2546 DBusConnection *connection;
2548 _dbus_return_val_if_fail (address != NULL, NULL);
2549 _dbus_return_val_if_error_is_set (error, NULL);
2551 connection = _dbus_connection_open_internal (address,
2559 * Opens a new, dedicated connection to a remote address. Unlike
2560 * dbus_connection_open(), always creates a new connection.
2561 * This connection will not be saved or recycled by libdbus.
2563 * If the open fails, the function returns #NULL, and provides a
2564 * reason for the failure in the error parameter. Pass #NULL for the
2565 * error parameter if you aren't interested in the reason for
2568 * When you are done with this connection, you must
2569 * dbus_connection_close() to disconnect it,
2570 * and dbus_connection_unref() to free the connection object.
2572 * (The dbus_connection_close() can be skipped if the
2573 * connection is already known to be disconnected, for example
2574 * if you are inside a handler for the Disconnected signal.)
2576 * @note Prefer dbus_connection_open() to dbus_connection_open_private()
2577 * unless you have good reason; connections are expensive enough
2578 * that it's wasteful to create lots of connections to the same
2581 * @param address the address.
2582 * @param error address where an error can be returned.
2583 * @returns new connection, or #NULL on failure.
2586 dbus_connection_open_private (const char *address,
2589 DBusConnection *connection;
2591 _dbus_return_val_if_fail (address != NULL, NULL);
2592 _dbus_return_val_if_error_is_set (error, NULL);
2594 connection = _dbus_connection_open_internal (address,
2602 * Increments the reference count of a DBusConnection.
2604 * @param connection the connection.
2605 * @returns the connection.
2608 dbus_connection_ref (DBusConnection *connection)
2610 _dbus_return_val_if_fail (connection != NULL, NULL);
2611 _dbus_return_val_if_fail (connection->generation == _dbus_current_generation, NULL);
2613 /* The connection lock is better than the global
2614 * lock in the atomic increment fallback
2617 #ifdef DBUS_HAVE_ATOMIC_INT
2618 _dbus_atomic_inc (&connection->refcount);
2620 CONNECTION_LOCK (connection);
2621 _dbus_assert (connection->refcount.value > 0);
2623 connection->refcount.value += 1;
2624 CONNECTION_UNLOCK (connection);
2631 free_outgoing_message (void *element,
2634 DBusMessage *message = element;
2635 DBusConnection *connection = data;
2637 _dbus_message_remove_size_counter (message,
2638 connection->outgoing_counter,
2640 dbus_message_unref (message);
2643 /* This is run without the mutex held, but after the last reference
2644 * to the connection has been dropped we should have no thread-related
2648 _dbus_connection_last_unref (DBusConnection *connection)
2652 _dbus_verbose ("Finalizing connection %p\n", connection);
2654 _dbus_assert (connection->refcount.value == 0);
2656 /* You have to disconnect the connection before unref:ing it. Otherwise
2657 * you won't get the disconnected message.
2659 _dbus_assert (!_dbus_transport_get_is_connected (connection->transport));
2660 _dbus_assert (connection->server_guid == NULL);
2662 /* ---- We're going to call various application callbacks here, hope it doesn't break anything... */
2663 _dbus_object_tree_free_all_unlocked (connection->objects);
2665 dbus_connection_set_dispatch_status_function (connection, NULL, NULL, NULL);
2666 dbus_connection_set_wakeup_main_function (connection, NULL, NULL, NULL);
2667 dbus_connection_set_unix_user_function (connection, NULL, NULL, NULL);
2669 _dbus_watch_list_free (connection->watches);
2670 connection->watches = NULL;
2672 _dbus_timeout_list_free (connection->timeouts);
2673 connection->timeouts = NULL;
2675 _dbus_data_slot_list_free (&connection->slot_list);
2677 link = _dbus_list_get_first_link (&connection->filter_list);
2678 while (link != NULL)
2680 DBusMessageFilter *filter = link->data;
2681 DBusList *next = _dbus_list_get_next_link (&connection->filter_list, link);
2683 filter->function = NULL;
2684 _dbus_message_filter_unref (filter); /* calls app callback */
2689 _dbus_list_clear (&connection->filter_list);
2691 /* ---- Done with stuff that invokes application callbacks */
2693 _dbus_object_tree_unref (connection->objects);
2695 _dbus_hash_table_unref (connection->pending_replies);
2696 connection->pending_replies = NULL;
2698 _dbus_list_clear (&connection->filter_list);
2700 _dbus_list_foreach (&connection->outgoing_messages,
2701 free_outgoing_message,
2703 _dbus_list_clear (&connection->outgoing_messages);
2705 _dbus_list_foreach (&connection->incoming_messages,
2706 (DBusForeachFunction) dbus_message_unref,
2708 _dbus_list_clear (&connection->incoming_messages);
2710 _dbus_counter_unref (connection->outgoing_counter);
2712 _dbus_transport_unref (connection->transport);
2714 if (connection->disconnect_message_link)
2716 DBusMessage *message = connection->disconnect_message_link->data;
2717 dbus_message_unref (message);
2718 _dbus_list_free_link (connection->disconnect_message_link);
2721 _dbus_list_clear (&connection->link_cache);
2723 _dbus_condvar_free_at_location (&connection->dispatch_cond);
2724 _dbus_condvar_free_at_location (&connection->io_path_cond);
2726 _dbus_mutex_free_at_location (&connection->io_path_mutex);
2727 _dbus_mutex_free_at_location (&connection->dispatch_mutex);
2729 _dbus_mutex_free_at_location (&connection->mutex);
2731 dbus_free (connection);
2735 * Decrements the reference count of a DBusConnection, and finalizes
2736 * it if the count reaches zero.
2738 * Note: it is a bug to drop the last reference to a connection that
2739 * is still connected.
2741 * For shared connections, libdbus will own a reference
2742 * as long as the connection is connected, so you can know that either
2743 * you don't have the last reference, or it's OK to drop the last reference.
2744 * Most connections are shared. dbus_connection_open() and dbus_bus_get()
2745 * return shared connections.
2747 * For private connections, the creator of the connection must arrange for
2748 * dbus_connection_close() to be called prior to dropping the last reference.
2749 * Private connections come from dbus_connection_open_private() or dbus_bus_get_private().
2751 * @param connection the connection.
2754 dbus_connection_unref (DBusConnection *connection)
2756 dbus_bool_t last_unref;
2758 _dbus_return_if_fail (connection != NULL);
2759 _dbus_return_if_fail (connection->generation == _dbus_current_generation);
2761 /* The connection lock is better than the global
2762 * lock in the atomic increment fallback
2765 #ifdef DBUS_HAVE_ATOMIC_INT
2766 last_unref = (_dbus_atomic_dec (&connection->refcount) == 1);
2768 CONNECTION_LOCK (connection);
2770 _dbus_assert (connection->refcount.value > 0);
2772 connection->refcount.value -= 1;
2773 last_unref = (connection->refcount.value == 0);
2776 printf ("unref() connection %p count = %d\n", connection, connection->refcount.value);
2779 CONNECTION_UNLOCK (connection);
2784 #ifndef DBUS_DISABLE_CHECKS
2785 if (_dbus_transport_get_is_connected (connection->transport))
2787 _dbus_warn_check_failed ("The last reference on a connection was dropped without closing the connection. This is a bug in an application. See dbus_connection_unref() documentation for details.\n%s",
2788 connection->shareable ?
2789 "Most likely, the application called unref() too many times and removed a reference belonging to libdbus, since this is a shared connection.\n" :
2790 "Most likely, the application was supposed to call dbus_connection_close(), since this is a private connection.\n");
2794 _dbus_connection_last_unref (connection);
2799 * Note that the transport can disconnect itself (other end drops us)
2800 * and in that case this function never runs. So this function must
2801 * not do anything more than disconnect the transport and update the
2804 * If the transport self-disconnects, then we assume someone will
2805 * dispatch the connection to cause the dispatch status update.
2808 _dbus_connection_close_possibly_shared_and_unlock (DBusConnection *connection)
2810 DBusDispatchStatus status;
2812 HAVE_LOCK_CHECK (connection);
2814 _dbus_verbose ("Disconnecting %p\n", connection);
2816 /* We need to ref because update_dispatch_status_and_unlock will unref
2817 * the connection if it was shared and libdbus was the only remaining
2820 _dbus_connection_ref_unlocked (connection);
2822 _dbus_transport_disconnect (connection->transport);
2824 /* This has the side effect of queuing the disconnect message link
2825 * (unless we don't have enough memory, possibly, so don't assert it).
2826 * After the disconnect message link is queued, dbus_bus_get/dbus_connection_open
2827 * should never again return the newly-disconnected connection.
2829 * However, we only unref the shared connection and exit_on_disconnect when
2830 * the disconnect message reaches the head of the message queue,
2831 * NOT when it's first queued.
2833 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2835 /* This calls out to user code */
2836 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2838 /* Could also call out to user code */
2839 dbus_connection_unref (connection);
2843 * Closes a private connection, so no further data can be sent or received.
2844 * This disconnects the transport (such as a socket) underlying the
2847 * Attempts to send messages after closing a connection are safe, but will result in
2848 * error replies generated locally in libdbus.
2850 * This function does not affect the connection's reference count. It's
2851 * safe to close a connection more than once; all calls after the
2852 * first do nothing. It's impossible to "reopen" a connection, a
2853 * new connection must be created. This function may result in a call
2854 * to the DBusDispatchStatusFunction set with
2855 * dbus_connection_set_dispatch_status_function(), as the disconnect
2856 * message it generates needs to be dispatched.
2858 * If a connection is dropped by the remote application, it will
2861 * You must close a connection prior to releasing the last reference to
2862 * the connection. If you dbus_connection_unref() for the last time
2863 * without closing the connection, the results are undefined; it
2864 * is a bug in your program and libdbus will try to print a warning.
2866 * You may not close a shared connection. Connections created with
2867 * dbus_connection_open() or dbus_bus_get() are shared.
2868 * These connections are owned by libdbus, and applications should
2869 * only unref them, never close them. Applications can know it is
2870 * safe to unref these connections because libdbus will be holding a
2871 * reference as long as the connection is open. Thus, either the
2872 * connection is closed and it is OK to drop the last reference,
2873 * or the connection is open and the app knows it does not have the
2876 * Connections created with dbus_connection_open_private() or
2877 * dbus_bus_get_private() are not kept track of or referenced by
2878 * libdbus. The creator of these connections is responsible for
2879 * calling dbus_connection_close() prior to releasing the last
2880 * reference, if the connection is not already disconnected.
2882 * @param connection the private (unshared) connection to close
2885 dbus_connection_close (DBusConnection *connection)
2887 _dbus_return_if_fail (connection != NULL);
2888 _dbus_return_if_fail (connection->generation == _dbus_current_generation);
2890 CONNECTION_LOCK (connection);
2892 #ifndef DBUS_DISABLE_CHECKS
2893 if (connection->shareable)
2895 CONNECTION_UNLOCK (connection);
2897 _dbus_warn_check_failed ("Applications must not close shared connections - see dbus_connection_close() docs. This is a bug in the application.\n");
2902 _dbus_connection_close_possibly_shared_and_unlock (connection);
2906 _dbus_connection_get_is_connected_unlocked (DBusConnection *connection)
2908 HAVE_LOCK_CHECK (connection);
2909 return _dbus_transport_get_is_connected (connection->transport);
2913 * Gets whether the connection is currently open. A connection may
2914 * become disconnected when the remote application closes its end, or
2915 * exits; a connection may also be disconnected with
2916 * dbus_connection_close().
2918 * There are not separate states for "closed" and "disconnected," the two
2919 * terms are synonymous. This function should really be called
2920 * get_is_open() but for historical reasons is not.
2922 * @param connection the connection.
2923 * @returns #TRUE if the connection is still alive.
2926 dbus_connection_get_is_connected (DBusConnection *connection)
2930 _dbus_return_val_if_fail (connection != NULL, FALSE);
2932 CONNECTION_LOCK (connection);
2933 res = _dbus_connection_get_is_connected_unlocked (connection);
2934 CONNECTION_UNLOCK (connection);
2940 * Gets whether the connection was authenticated. (Note that
2941 * if the connection was authenticated then disconnected,
2942 * this function still returns #TRUE)
2944 * @param connection the connection
2945 * @returns #TRUE if the connection was ever authenticated
2948 dbus_connection_get_is_authenticated (DBusConnection *connection)
2952 _dbus_return_val_if_fail (connection != NULL, FALSE);
2954 CONNECTION_LOCK (connection);
2955 res = _dbus_transport_get_is_authenticated (connection->transport);
2956 CONNECTION_UNLOCK (connection);
2962 * Gets whether the connection is not authenticated as a specific
2963 * user. If the connection is not authenticated, this function
2964 * returns #TRUE, and if it is authenticated but as an anonymous user,
2965 * it returns #TRUE. If it is authenticated as a specific user, then
2966 * this returns #FALSE. (Note that if the connection was authenticated
2967 * as anonymous then disconnected, this function still returns #TRUE.)
2969 * If the connection is not anonymous, you can use
2970 * dbus_connection_get_unix_user() and
2971 * dbus_connection_get_windows_user() to see who it's authorized as.
2973 * If you want to prevent non-anonymous authorization, use
2974 * dbus_server_set_auth_mechanisms() to remove the mechanisms that
2975 * allow proving user identity (i.e. only allow the ANONYMOUS
2978 * @param connection the connection
2979 * @returns #TRUE if not authenticated or authenticated as anonymous
2982 dbus_connection_get_is_anonymous (DBusConnection *connection)
2986 _dbus_return_val_if_fail (connection != NULL, FALSE);
2988 CONNECTION_LOCK (connection);
2989 res = _dbus_transport_get_is_anonymous (connection->transport);
2990 CONNECTION_UNLOCK (connection);
2996 * Gets the ID of the server address we are authenticated to, if this
2997 * connection is on the client side. If the connection is on the
2998 * server side, this will always return #NULL - use dbus_server_get_id()
2999 * to get the ID of your own server, if you are the server side.
3001 * If a client-side connection is not authenticated yet, the ID may be
3002 * available if it was included in the server address, but may not be
3003 * available. The only way to be sure the server ID is available
3004 * is to wait for authentication to complete.
3006 * In general, each mode of connecting to a given server will have
3007 * its own ID. So for example, if the session bus daemon is listening
3008 * on UNIX domain sockets and on TCP, then each of those modalities
3009 * will have its own server ID.
3011 * If you want an ID that identifies an entire session bus, look at
3012 * dbus_bus_get_id() instead (which is just a convenience wrapper
3013 * around the org.freedesktop.DBus.GetId method invoked on the bus).
3015 * You can also get a machine ID; see dbus_get_local_machine_id() to
3016 * get the machine you are on. There isn't a convenience wrapper, but
3017 * you can invoke org.freedesktop.DBus.Peer.GetMachineId on any peer
3018 * to get the machine ID on the other end.
3020 * The D-Bus specification describes the server ID and other IDs in a
3023 * @param connection the connection
3024 * @returns the server ID or #NULL if no memory or the connection is server-side
3027 dbus_connection_get_server_id (DBusConnection *connection)
3031 _dbus_return_val_if_fail (connection != NULL, NULL);
3033 CONNECTION_LOCK (connection);
3034 id = _dbus_strdup (_dbus_transport_get_server_id (connection->transport));
3035 CONNECTION_UNLOCK (connection);
3041 * Set whether _exit() should be called when the connection receives a
3042 * disconnect signal. The call to _exit() comes after any handlers for
3043 * the disconnect signal run; handlers can cancel the exit by calling
3046 * By default, exit_on_disconnect is #FALSE; but for message bus
3047 * connections returned from dbus_bus_get() it will be toggled on
3050 * @param connection the connection
3051 * @param exit_on_disconnect #TRUE if _exit() should be called after a disconnect signal
3054 dbus_connection_set_exit_on_disconnect (DBusConnection *connection,
3055 dbus_bool_t exit_on_disconnect)
3057 _dbus_return_if_fail (connection != NULL);
3059 CONNECTION_LOCK (connection);
3060 connection->exit_on_disconnect = exit_on_disconnect != FALSE;
3061 CONNECTION_UNLOCK (connection);
3065 * Preallocates resources needed to send a message, allowing the message
3066 * to be sent without the possibility of memory allocation failure.
3067 * Allows apps to create a future guarantee that they can send
3068 * a message regardless of memory shortages.
3070 * @param connection the connection we're preallocating for.
3071 * @returns the preallocated resources, or #NULL
3073 DBusPreallocatedSend*
3074 dbus_connection_preallocate_send (DBusConnection *connection)
3076 DBusPreallocatedSend *preallocated;
3078 _dbus_return_val_if_fail (connection != NULL, NULL);
3080 CONNECTION_LOCK (connection);
3083 _dbus_connection_preallocate_send_unlocked (connection);
3085 CONNECTION_UNLOCK (connection);
3087 return preallocated;
3091 * Frees preallocated message-sending resources from
3092 * dbus_connection_preallocate_send(). Should only
3093 * be called if the preallocated resources are not used
3094 * to send a message.
3096 * @param connection the connection
3097 * @param preallocated the resources
3100 dbus_connection_free_preallocated_send (DBusConnection *connection,
3101 DBusPreallocatedSend *preallocated)
3103 _dbus_return_if_fail (connection != NULL);
3104 _dbus_return_if_fail (preallocated != NULL);
3105 _dbus_return_if_fail (connection == preallocated->connection);
3107 _dbus_list_free_link (preallocated->queue_link);
3108 _dbus_counter_unref (preallocated->counter_link->data);
3109 _dbus_list_free_link (preallocated->counter_link);
3110 dbus_free (preallocated);
3114 * Sends a message using preallocated resources. This function cannot fail.
3115 * It works identically to dbus_connection_send() in other respects.
3116 * Preallocated resources comes from dbus_connection_preallocate_send().
3117 * This function "consumes" the preallocated resources, they need not
3118 * be freed separately.
3120 * @param connection the connection
3121 * @param preallocated the preallocated resources
3122 * @param message the message to send
3123 * @param client_serial return location for client serial assigned to the message
3126 dbus_connection_send_preallocated (DBusConnection *connection,
3127 DBusPreallocatedSend *preallocated,
3128 DBusMessage *message,
3129 dbus_uint32_t *client_serial)
3131 _dbus_return_if_fail (connection != NULL);
3132 _dbus_return_if_fail (preallocated != NULL);
3133 _dbus_return_if_fail (message != NULL);
3134 _dbus_return_if_fail (preallocated->connection == connection);
3135 _dbus_return_if_fail (dbus_message_get_type (message) != DBUS_MESSAGE_TYPE_METHOD_CALL ||
3136 dbus_message_get_member (message) != NULL);
3137 _dbus_return_if_fail (dbus_message_get_type (message) != DBUS_MESSAGE_TYPE_SIGNAL ||
3138 (dbus_message_get_interface (message) != NULL &&
3139 dbus_message_get_member (message) != NULL));
3141 CONNECTION_LOCK (connection);
3142 _dbus_connection_send_preallocated_and_unlock (connection,
3144 message, client_serial);
3148 _dbus_connection_send_unlocked_no_update (DBusConnection *connection,
3149 DBusMessage *message,
3150 dbus_uint32_t *client_serial)
3152 DBusPreallocatedSend *preallocated;
3154 _dbus_assert (connection != NULL);
3155 _dbus_assert (message != NULL);
3157 preallocated = _dbus_connection_preallocate_send_unlocked (connection);
3158 if (preallocated == NULL)
3161 _dbus_connection_send_preallocated_unlocked_no_update (connection,
3169 * Adds a message to the outgoing message queue. Does not block to
3170 * write the message to the network; that happens asynchronously. To
3171 * force the message to be written, call dbus_connection_flush() however
3172 * it is not necessary to call dbus_connection_flush() by hand; the
3173 * message will be sent the next time the main loop is run.
3174 * dbus_connection_flush() should only be used, for example, if
3175 * the application was expected to exit before running the main loop.
3177 * Because this only queues the message, the only reason it can
3178 * fail is lack of memory. Even if the connection is disconnected,
3179 * no error will be returned. If the function fails due to lack of memory,
3180 * it returns #FALSE. The function will never fail for other reasons; even
3181 * if the connection is disconnected, you can queue an outgoing message,
3182 * though obviously it won't be sent.
3184 * The message serial is used by the remote application to send a
3185 * reply; see dbus_message_get_serial() or the D-Bus specification.
3187 * dbus_message_unref() can be called as soon as this method returns
3188 * as the message queue will hold its own ref until the message is sent.
3190 * @param connection the connection.
3191 * @param message the message to write.
3192 * @param serial return location for message serial, or #NULL if you don't care
3193 * @returns #TRUE on success.
3196 dbus_connection_send (DBusConnection *connection,
3197 DBusMessage *message,
3198 dbus_uint32_t *serial)
3200 _dbus_return_val_if_fail (connection != NULL, FALSE);
3201 _dbus_return_val_if_fail (message != NULL, FALSE);
3203 CONNECTION_LOCK (connection);
3205 return _dbus_connection_send_and_unlock (connection,
3211 reply_handler_timeout (void *data)
3213 DBusConnection *connection;
3214 DBusDispatchStatus status;
3215 DBusPendingCall *pending = data;
3217 connection = _dbus_pending_call_get_connection_and_lock (pending);
3219 _dbus_pending_call_queue_timeout_error_unlocked (pending,
3221 _dbus_connection_remove_timeout_unlocked (connection,
3222 _dbus_pending_call_get_timeout_unlocked (pending));
3223 _dbus_pending_call_set_timeout_added_unlocked (pending, FALSE);
3225 _dbus_verbose ("%s middle\n", _DBUS_FUNCTION_NAME);
3226 status = _dbus_connection_get_dispatch_status_unlocked (connection);
3228 /* Unlocks, and calls out to user code */
3229 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
3235 * Queues a message to send, as with dbus_connection_send(),
3236 * but also returns a #DBusPendingCall used to receive a reply to the
3237 * message. If no reply is received in the given timeout_milliseconds,
3238 * this function expires the pending reply and generates a synthetic
3239 * error reply (generated in-process, not by the remote application)
3240 * indicating that a timeout occurred.
3242 * A #DBusPendingCall will see a reply message before any filters or
3243 * registered object path handlers. See dbus_connection_dispatch() for
3244 * details on when handlers are run.
3246 * A #DBusPendingCall will always see exactly one reply message,
3247 * unless it's cancelled with dbus_pending_call_cancel().
3249 * If #NULL is passed for the pending_return, the #DBusPendingCall
3250 * will still be generated internally, and used to track
3251 * the message reply timeout. This means a timeout error will
3252 * occur if no reply arrives, unlike with dbus_connection_send().
3254 * If -1 is passed for the timeout, a sane default timeout is used. -1
3255 * is typically the best value for the timeout for this reason, unless
3256 * you want a very short or very long timeout. If INT_MAX is passed for
3257 * the timeout, no timeout will be set and the call will block forever.
3259 * @warning if the connection is disconnected, the #DBusPendingCall
3260 * will be set to #NULL, so be careful with this.
3262 * @param connection the connection
3263 * @param message the message to send
3264 * @param pending_return return location for a #DBusPendingCall object, or #NULL if connection is disconnected
3265 * @param timeout_milliseconds timeout in milliseconds, -1 for default or INT_MAX for no timeout
3266 * @returns #FALSE if no memory, #TRUE otherwise.
3270 dbus_connection_send_with_reply (DBusConnection *connection,
3271 DBusMessage *message,
3272 DBusPendingCall **pending_return,
3273 int timeout_milliseconds)
3275 DBusPendingCall *pending;
3276 dbus_int32_t serial = -1;
3277 DBusDispatchStatus status;
3279 _dbus_return_val_if_fail (connection != NULL, FALSE);
3280 _dbus_return_val_if_fail (message != NULL, FALSE);
3281 _dbus_return_val_if_fail (timeout_milliseconds >= 0 || timeout_milliseconds == -1, FALSE);
3284 *pending_return = NULL;
3286 CONNECTION_LOCK (connection);
3288 if (!_dbus_connection_get_is_connected_unlocked (connection))
3290 CONNECTION_UNLOCK (connection);
3295 pending = _dbus_pending_call_new_unlocked (connection,
3296 timeout_milliseconds,
3297 reply_handler_timeout);
3299 if (pending == NULL)
3301 CONNECTION_UNLOCK (connection);
3305 /* Assign a serial to the message */
3306 serial = dbus_message_get_serial (message);
3309 serial = _dbus_connection_get_next_client_serial (connection);
3310 dbus_message_set_serial (message, serial);
3313 if (!_dbus_pending_call_set_timeout_error_unlocked (pending, message, serial))
3316 /* Insert the serial in the pending replies hash;
3317 * hash takes a refcount on DBusPendingCall.
3318 * Also, add the timeout.
3320 if (!_dbus_connection_attach_pending_call_unlocked (connection,
3324 if (!_dbus_connection_send_unlocked_no_update (connection, message, NULL))
3326 _dbus_connection_detach_pending_call_and_unlock (connection,
3328 goto error_unlocked;
3332 *pending_return = pending; /* hand off refcount */
3335 _dbus_connection_detach_pending_call_unlocked (connection, pending);
3336 /* we still have a ref to the pending call in this case, we unref
3337 * after unlocking, below
3341 status = _dbus_connection_get_dispatch_status_unlocked (connection);
3343 /* this calls out to user code */
3344 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
3346 if (pending_return == NULL)
3347 dbus_pending_call_unref (pending);
3352 CONNECTION_UNLOCK (connection);
3354 dbus_pending_call_unref (pending);
3359 * Sends a message and blocks a certain time period while waiting for
3360 * a reply. This function does not reenter the main loop,
3361 * i.e. messages other than the reply are queued up but not
3362 * processed. This function is used to invoke method calls on a
3365 * If a normal reply is received, it is returned, and removed from the
3366 * incoming message queue. If it is not received, #NULL is returned
3367 * and the error is set to #DBUS_ERROR_NO_REPLY. If an error reply is
3368 * received, it is converted to a #DBusError and returned as an error,
3369 * then the reply message is deleted and #NULL is returned. If
3370 * something else goes wrong, result is set to whatever is
3371 * appropriate, such as #DBUS_ERROR_NO_MEMORY or
3372 * #DBUS_ERROR_DISCONNECTED.
3374 * @warning While this function blocks the calling thread will not be
3375 * processing the incoming message queue. This means you can end up
3376 * deadlocked if the application you're talking to needs you to reply
3377 * to a method. To solve this, either avoid the situation, block in a
3378 * separate thread from the main connection-dispatching thread, or use
3379 * dbus_pending_call_set_notify() to avoid blocking.
3381 * @param connection the connection
3382 * @param message the message to send
3383 * @param timeout_milliseconds timeout in milliseconds, -1 for default or INT_MAX for no timeout.
3384 * @param error return location for error message
3385 * @returns the message that is the reply or #NULL with an error code if the
3389 dbus_connection_send_with_reply_and_block (DBusConnection *connection,
3390 DBusMessage *message,
3391 int timeout_milliseconds,
3395 DBusPendingCall *pending;
3397 _dbus_return_val_if_fail (connection != NULL, NULL);
3398 _dbus_return_val_if_fail (message != NULL, NULL);
3399 _dbus_return_val_if_fail (timeout_milliseconds >= 0 || timeout_milliseconds == -1, NULL);
3400 _dbus_return_val_if_error_is_set (error, NULL);
3402 if (!dbus_connection_send_with_reply (connection, message,
3403 &pending, timeout_milliseconds))
3405 _DBUS_SET_OOM (error);
3409 if (pending == NULL)
3411 dbus_set_error (error, DBUS_ERROR_DISCONNECTED, "Connection is closed");
3415 dbus_pending_call_block (pending);
3417 reply = dbus_pending_call_steal_reply (pending);
3418 dbus_pending_call_unref (pending);
3420 /* call_complete_and_unlock() called from pending_call_block() should
3421 * always fill this in.
3423 _dbus_assert (reply != NULL);
3425 if (dbus_set_error_from_message (error, reply))
3427 dbus_message_unref (reply);
3435 * Blocks until the outgoing message queue is empty.
3436 * Assumes connection lock already held.
3438 * If you call this, you MUST call update_dispatch_status afterword...
3440 * @param connection the connection.
3442 static DBusDispatchStatus
3443 _dbus_connection_flush_unlocked (DBusConnection *connection)
3445 /* We have to specify DBUS_ITERATION_DO_READING here because
3446 * otherwise we could have two apps deadlock if they are both doing
3447 * a flush(), and the kernel buffers fill up. This could change the
3450 DBusDispatchStatus status;
3452 HAVE_LOCK_CHECK (connection);
3454 while (connection->n_outgoing > 0 &&
3455 _dbus_connection_get_is_connected_unlocked (connection))
3457 _dbus_verbose ("doing iteration in %s\n", _DBUS_FUNCTION_NAME);
3458 HAVE_LOCK_CHECK (connection);
3459 _dbus_connection_do_iteration_unlocked (connection,
3461 DBUS_ITERATION_DO_READING |
3462 DBUS_ITERATION_DO_WRITING |
3463 DBUS_ITERATION_BLOCK,
3467 HAVE_LOCK_CHECK (connection);
3468 _dbus_verbose ("%s middle\n", _DBUS_FUNCTION_NAME);
3469 status = _dbus_connection_get_dispatch_status_unlocked (connection);
3471 HAVE_LOCK_CHECK (connection);
3476 * Blocks until the outgoing message queue is empty.
3478 * @param connection the connection.
3481 dbus_connection_flush (DBusConnection *connection)
3483 /* We have to specify DBUS_ITERATION_DO_READING here because
3484 * otherwise we could have two apps deadlock if they are both doing
3485 * a flush(), and the kernel buffers fill up. This could change the
3488 DBusDispatchStatus status;
3490 _dbus_return_if_fail (connection != NULL);
3492 CONNECTION_LOCK (connection);
3494 status = _dbus_connection_flush_unlocked (connection);
3496 HAVE_LOCK_CHECK (connection);
3497 /* Unlocks and calls out to user code */
3498 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
3500 _dbus_verbose ("%s end\n", _DBUS_FUNCTION_NAME);
3504 * This function implements dbus_connection_read_write_dispatch() and
3505 * dbus_connection_read_write() (they pass a different value for the
3506 * dispatch parameter).
3508 * @param connection the connection
3509 * @param timeout_milliseconds max time to block or -1 for infinite
3510 * @param dispatch dispatch new messages or leave them on the incoming queue
3511 * @returns #TRUE if the disconnect message has not been processed
3514 _dbus_connection_read_write_dispatch (DBusConnection *connection,
3515 int timeout_milliseconds,
3516 dbus_bool_t dispatch)
3518 DBusDispatchStatus dstatus;
3519 dbus_bool_t progress_possible;
3521 /* Need to grab a ref here in case we're a private connection and
3522 * the user drops the last ref in a handler we call; see bug
3523 * https://bugs.freedesktop.org/show_bug.cgi?id=15635
3525 dbus_connection_ref (connection);
3526 dstatus = dbus_connection_get_dispatch_status (connection);
3528 if (dispatch && dstatus == DBUS_DISPATCH_DATA_REMAINS)
3530 _dbus_verbose ("doing dispatch in %s\n", _DBUS_FUNCTION_NAME);
3531 dbus_connection_dispatch (connection);
3532 CONNECTION_LOCK (connection);
3534 else if (dstatus == DBUS_DISPATCH_NEED_MEMORY)
3536 _dbus_verbose ("pausing for memory in %s\n", _DBUS_FUNCTION_NAME);
3537 _dbus_memory_pause_based_on_timeout (timeout_milliseconds);
3538 CONNECTION_LOCK (connection);
3542 CONNECTION_LOCK (connection);
3543 if (_dbus_connection_get_is_connected_unlocked (connection))
3545 _dbus_verbose ("doing iteration in %s\n", _DBUS_FUNCTION_NAME);
3546 _dbus_connection_do_iteration_unlocked (connection,
3548 DBUS_ITERATION_DO_READING |
3549 DBUS_ITERATION_DO_WRITING |
3550 DBUS_ITERATION_BLOCK,
3551 timeout_milliseconds);
3555 HAVE_LOCK_CHECK (connection);
3556 /* If we can dispatch, we can make progress until the Disconnected message
3557 * has been processed; if we can only read/write, we can make progress
3558 * as long as the transport is open.
3561 progress_possible = connection->n_incoming != 0 ||
3562 connection->disconnect_message_link != NULL;
3564 progress_possible = _dbus_connection_get_is_connected_unlocked (connection);
3566 CONNECTION_UNLOCK (connection);
3568 dbus_connection_unref (connection);
3570 return progress_possible; /* TRUE if we can make more progress */
3575 * This function is intended for use with applications that don't want
3576 * to write a main loop and deal with #DBusWatch and #DBusTimeout. An
3577 * example usage would be:
3580 * while (dbus_connection_read_write_dispatch (connection, -1))
3581 * ; // empty loop body
3584 * In this usage you would normally have set up a filter function to look
3585 * at each message as it is dispatched. The loop terminates when the last
3586 * message from the connection (the disconnected signal) is processed.
3588 * If there are messages to dispatch, this function will
3589 * dbus_connection_dispatch() once, and return. If there are no
3590 * messages to dispatch, this function will block until it can read or
3591 * write, then read or write, then return.
3593 * The way to think of this function is that it either makes some sort
3594 * of progress, or it blocks. Note that, while it is blocked on I/O, it
3595 * cannot be interrupted (even by other threads), which makes this function
3596 * unsuitable for applications that do more than just react to received
3599 * The return value indicates whether the disconnect message has been
3600 * processed, NOT whether the connection is connected. This is
3601 * important because even after disconnecting, you want to process any
3602 * messages you received prior to the disconnect.
3604 * @param connection the connection
3605 * @param timeout_milliseconds max time to block or -1 for infinite
3606 * @returns #TRUE if the disconnect message has not been processed
3609 dbus_connection_read_write_dispatch (DBusConnection *connection,
3610 int timeout_milliseconds)
3612 _dbus_return_val_if_fail (connection != NULL, FALSE);
3613 _dbus_return_val_if_fail (timeout_milliseconds >= 0 || timeout_milliseconds == -1, FALSE);
3614 return _dbus_connection_read_write_dispatch(connection, timeout_milliseconds, TRUE);
3618 * This function is intended for use with applications that don't want to
3619 * write a main loop and deal with #DBusWatch and #DBusTimeout. See also
3620 * dbus_connection_read_write_dispatch().
3622 * As long as the connection is open, this function will block until it can
3623 * read or write, then read or write, then return #TRUE.
3625 * If the connection is closed, the function returns #FALSE.
3627 * The return value indicates whether reading or writing is still
3628 * possible, i.e. whether the connection is connected.
3630 * Note that even after disconnection, messages may remain in the
3631 * incoming queue that need to be
3632 * processed. dbus_connection_read_write_dispatch() dispatches
3633 * incoming messages for you; with dbus_connection_read_write() you
3634 * have to arrange to drain the incoming queue yourself.
3636 * @param connection the connection
3637 * @param timeout_milliseconds max time to block or -1 for infinite
3638 * @returns #TRUE if still connected
3641 dbus_connection_read_write (DBusConnection *connection,
3642 int timeout_milliseconds)
3644 _dbus_return_val_if_fail (connection != NULL, FALSE);
3645 _dbus_return_val_if_fail (timeout_milliseconds >= 0 || timeout_milliseconds == -1, FALSE);
3646 return _dbus_connection_read_write_dispatch(connection, timeout_milliseconds, FALSE);
3649 /* We need to call this anytime we pop the head of the queue, and then
3650 * update_dispatch_status_and_unlock needs to be called afterward
3651 * which will "process" the disconnected message and set
3652 * disconnected_message_processed.
3655 check_disconnected_message_arrived_unlocked (DBusConnection *connection,
3656 DBusMessage *head_of_queue)
3658 HAVE_LOCK_CHECK (connection);
3660 /* checking that the link is NULL is an optimization to avoid the is_signal call */
3661 if (connection->disconnect_message_link == NULL &&
3662 dbus_message_is_signal (head_of_queue,
3663 DBUS_INTERFACE_LOCAL,
3666 connection->disconnected_message_arrived = TRUE;
3671 * Returns the first-received message from the incoming message queue,
3672 * leaving it in the queue. If the queue is empty, returns #NULL.
3674 * The caller does not own a reference to the returned message, and
3675 * must either return it using dbus_connection_return_message() or
3676 * keep it after calling dbus_connection_steal_borrowed_message(). No
3677 * one can get at the message while its borrowed, so return it as
3678 * quickly as possible and don't keep a reference to it after
3679 * returning it. If you need to keep the message, make a copy of it.
3681 * dbus_connection_dispatch() will block if called while a borrowed
3682 * message is outstanding; only one piece of code can be playing with
3683 * the incoming queue at a time. This function will block if called
3684 * during a dbus_connection_dispatch().
3686 * @param connection the connection.
3687 * @returns next message in the incoming queue.
3690 dbus_connection_borrow_message (DBusConnection *connection)
3692 DBusDispatchStatus status;
3693 DBusMessage *message;
3695 _dbus_return_val_if_fail (connection != NULL, NULL);
3697 _dbus_verbose ("%s start\n", _DBUS_FUNCTION_NAME);
3699 /* this is called for the side effect that it queues
3700 * up any messages from the transport
3702 status = dbus_connection_get_dispatch_status (connection);
3703 if (status != DBUS_DISPATCH_DATA_REMAINS)
3706 CONNECTION_LOCK (connection);
3708 _dbus_connection_acquire_dispatch (connection);
3710 /* While a message is outstanding, the dispatch lock is held */
3711 _dbus_assert (connection->message_borrowed == NULL);
3713 connection->message_borrowed = _dbus_list_get_first (&connection->incoming_messages);
3715 message = connection->message_borrowed;
3717 check_disconnected_message_arrived_unlocked (connection, message);
3719 /* Note that we KEEP the dispatch lock until the message is returned */
3720 if (message == NULL)
3721 _dbus_connection_release_dispatch (connection);
3723 CONNECTION_UNLOCK (connection);
3725 /* We don't update dispatch status until it's returned or stolen */
3731 * Used to return a message after peeking at it using
3732 * dbus_connection_borrow_message(). Only called if
3733 * message from dbus_connection_borrow_message() was non-#NULL.
3735 * @param connection the connection
3736 * @param message the message from dbus_connection_borrow_message()
3739 dbus_connection_return_message (DBusConnection *connection,
3740 DBusMessage *message)
3742 DBusDispatchStatus status;
3744 _dbus_return_if_fail (connection != NULL);
3745 _dbus_return_if_fail (message != NULL);
3746 _dbus_return_if_fail (message == connection->message_borrowed);
3747 _dbus_return_if_fail (connection->dispatch_acquired);
3749 CONNECTION_LOCK (connection);
3751 _dbus_assert (message == connection->message_borrowed);
3753 connection->message_borrowed = NULL;
3755 _dbus_connection_release_dispatch (connection);
3757 status = _dbus_connection_get_dispatch_status_unlocked (connection);
3758 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
3762 * Used to keep a message after peeking at it using
3763 * dbus_connection_borrow_message(). Before using this function, see
3764 * the caveats/warnings in the documentation for
3765 * dbus_connection_pop_message().
3767 * @param connection the connection
3768 * @param message the message from dbus_connection_borrow_message()
3771 dbus_connection_steal_borrowed_message (DBusConnection *connection,
3772 DBusMessage *message)
3774 DBusMessage *pop_message;
3775 DBusDispatchStatus status;
3777 _dbus_return_if_fail (connection != NULL);
3778 _dbus_return_if_fail (message != NULL);
3779 _dbus_return_if_fail (message == connection->message_borrowed);
3780 _dbus_return_if_fail (connection->dispatch_acquired);
3782 CONNECTION_LOCK (connection);
3784 _dbus_assert (message == connection->message_borrowed);
3786 pop_message = _dbus_list_pop_first (&connection->incoming_messages);
3787 _dbus_assert (message == pop_message);
3789 connection->n_incoming -= 1;
3791 _dbus_verbose ("Incoming message %p stolen from queue, %d incoming\n",
3792 message, connection->n_incoming);
3794 connection->message_borrowed = NULL;
3796 _dbus_connection_release_dispatch (connection);
3798 status = _dbus_connection_get_dispatch_status_unlocked (connection);
3799 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
3802 /* See dbus_connection_pop_message, but requires the caller to own
3803 * the lock before calling. May drop the lock while running.
3806 _dbus_connection_pop_message_link_unlocked (DBusConnection *connection)
3808 HAVE_LOCK_CHECK (connection);
3810 _dbus_assert (connection->message_borrowed == NULL);
3812 if (connection->n_incoming > 0)
3816 link = _dbus_list_pop_first_link (&connection->incoming_messages);
3817 connection->n_incoming -= 1;
3819 _dbus_verbose ("Message %p (%d %s %s %s '%s') removed from incoming queue %p, %d incoming\n",
3821 dbus_message_get_type (link->data),
3822 dbus_message_get_path (link->data) ?
3823 dbus_message_get_path (link->data) :
3825 dbus_message_get_interface (link->data) ?
3826 dbus_message_get_interface (link->data) :
3828 dbus_message_get_member (link->data) ?
3829 dbus_message_get_member (link->data) :
3831 dbus_message_get_signature (link->data),
3832 connection, connection->n_incoming);
3834 check_disconnected_message_arrived_unlocked (connection, link->data);
3842 /* See dbus_connection_pop_message, but requires the caller to own
3843 * the lock before calling. May drop the lock while running.
3846 _dbus_connection_pop_message_unlocked (DBusConnection *connection)
3850 HAVE_LOCK_CHECK (connection);
3852 link = _dbus_connection_pop_message_link_unlocked (connection);
3856 DBusMessage *message;
3858 message = link->data;
3860 _dbus_list_free_link (link);
3869 _dbus_connection_putback_message_link_unlocked (DBusConnection *connection,
3870 DBusList *message_link)
3872 HAVE_LOCK_CHECK (connection);
3874 _dbus_assert (message_link != NULL);
3875 /* You can't borrow a message while a link is outstanding */
3876 _dbus_assert (connection->message_borrowed == NULL);
3877 /* We had to have the dispatch lock across the pop/putback */
3878 _dbus_assert (connection->dispatch_acquired);
3880 _dbus_list_prepend_link (&connection->incoming_messages,
3882 connection->n_incoming += 1;
3884 _dbus_verbose ("Message %p (%d %s %s '%s') put back into queue %p, %d incoming\n",
3886 dbus_message_get_type (message_link->data),
3887 dbus_message_get_interface (message_link->data) ?
3888 dbus_message_get_interface (message_link->data) :
3890 dbus_message_get_member (message_link->data) ?
3891 dbus_message_get_member (message_link->data) :
3893 dbus_message_get_signature (message_link->data),
3894 connection, connection->n_incoming);
3898 * Returns the first-received message from the incoming message queue,
3899 * removing it from the queue. The caller owns a reference to the
3900 * returned message. If the queue is empty, returns #NULL.
3902 * This function bypasses any message handlers that are registered,
3903 * and so using it is usually wrong. Instead, let the main loop invoke
3904 * dbus_connection_dispatch(). Popping messages manually is only
3905 * useful in very simple programs that don't share a #DBusConnection
3906 * with any libraries or other modules.
3908 * There is a lock that covers all ways of accessing the incoming message
3909 * queue, so dbus_connection_dispatch(), dbus_connection_pop_message(),
3910 * dbus_connection_borrow_message(), etc. will all block while one of the others
3911 * in the group is running.
3913 * @param connection the connection.
3914 * @returns next message in the incoming queue.
3917 dbus_connection_pop_message (DBusConnection *connection)
3919 DBusMessage *message;
3920 DBusDispatchStatus status;
3922 _dbus_verbose ("%s start\n", _DBUS_FUNCTION_NAME);
3924 /* this is called for the side effect that it queues
3925 * up any messages from the transport
3927 status = dbus_connection_get_dispatch_status (connection);
3928 if (status != DBUS_DISPATCH_DATA_REMAINS)
3931 CONNECTION_LOCK (connection);
3932 _dbus_connection_acquire_dispatch (connection);
3933 HAVE_LOCK_CHECK (connection);
3935 message = _dbus_connection_pop_message_unlocked (connection);
3937 _dbus_verbose ("Returning popped message %p\n", message);
3939 _dbus_connection_release_dispatch (connection);
3941 status = _dbus_connection_get_dispatch_status_unlocked (connection);
3942 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
3948 * Acquire the dispatcher. This is a separate lock so the main
3949 * connection lock can be dropped to call out to application dispatch
3952 * @param connection the connection.
3955 _dbus_connection_acquire_dispatch (DBusConnection *connection)
3957 HAVE_LOCK_CHECK (connection);
3959 _dbus_connection_ref_unlocked (connection);
3960 CONNECTION_UNLOCK (connection);
3962 _dbus_verbose ("%s locking dispatch_mutex\n", _DBUS_FUNCTION_NAME);
3963 _dbus_mutex_lock (connection->dispatch_mutex);
3965 while (connection->dispatch_acquired)
3967 _dbus_verbose ("%s waiting for dispatch to be acquirable\n", _DBUS_FUNCTION_NAME);
3968 _dbus_condvar_wait (connection->dispatch_cond,
3969 connection->dispatch_mutex);
3972 _dbus_assert (!connection->dispatch_acquired);
3974 connection->dispatch_acquired = TRUE;
3976 _dbus_verbose ("%s unlocking dispatch_mutex\n", _DBUS_FUNCTION_NAME);
3977 _dbus_mutex_unlock (connection->dispatch_mutex);
3979 CONNECTION_LOCK (connection);
3980 _dbus_connection_unref_unlocked (connection);
3984 * Release the dispatcher when you're done with it. Only call
3985 * after you've acquired the dispatcher. Wakes up at most one
3986 * thread currently waiting to acquire the dispatcher.
3988 * @param connection the connection.
3991 _dbus_connection_release_dispatch (DBusConnection *connection)
3993 HAVE_LOCK_CHECK (connection);
3995 _dbus_verbose ("%s locking dispatch_mutex\n", _DBUS_FUNCTION_NAME);
3996 _dbus_mutex_lock (connection->dispatch_mutex);
3998 _dbus_assert (connection->dispatch_acquired);
4000 connection->dispatch_acquired = FALSE;
4001 _dbus_condvar_wake_one (connection->dispatch_cond);
4003 _dbus_verbose ("%s unlocking dispatch_mutex\n", _DBUS_FUNCTION_NAME);
4004 _dbus_mutex_unlock (connection->dispatch_mutex);
4008 _dbus_connection_failed_pop (DBusConnection *connection,
4009 DBusList *message_link)
4011 _dbus_list_prepend_link (&connection->incoming_messages,
4013 connection->n_incoming += 1;
4016 /* Note this may be called multiple times since we don't track whether we already did it */
4018 notify_disconnected_unlocked (DBusConnection *connection)
4020 HAVE_LOCK_CHECK (connection);
4022 /* Set the weakref in dbus-bus.c to NULL, so nobody will get a disconnected
4023 * connection from dbus_bus_get(). We make the same guarantee for
4024 * dbus_connection_open() but in a different way since we don't want to
4025 * unref right here; we instead check for connectedness before returning
4026 * the connection from the hash.
4028 _dbus_bus_notify_shared_connection_disconnected_unlocked (connection);
4030 /* Dump the outgoing queue, we aren't going to be able to
4031 * send it now, and we'd like accessors like
4032 * dbus_connection_get_outgoing_size() to be accurate.
4034 if (connection->n_outgoing > 0)
4038 _dbus_verbose ("Dropping %d outgoing messages since we're disconnected\n",
4039 connection->n_outgoing);
4041 while ((link = _dbus_list_get_last_link (&connection->outgoing_messages)))
4043 _dbus_connection_message_sent (connection, link->data);
4048 /* Note this may be called multiple times since we don't track whether we already did it */
4049 static DBusDispatchStatus
4050 notify_disconnected_and_dispatch_complete_unlocked (DBusConnection *connection)
4052 HAVE_LOCK_CHECK (connection);
4054 if (connection->disconnect_message_link != NULL)
4056 _dbus_verbose ("Sending disconnect message from %s\n",
4057 _DBUS_FUNCTION_NAME);
4059 /* If we have pending calls, queue their timeouts - we want the Disconnected
4060 * to be the last message, after these timeouts.
4062 connection_timeout_and_complete_all_pending_calls_unlocked (connection);
4064 /* We haven't sent the disconnect message already,
4065 * and all real messages have been queued up.
4067 _dbus_connection_queue_synthesized_message_link (connection,
4068 connection->disconnect_message_link);
4069 connection->disconnect_message_link = NULL;
4071 return DBUS_DISPATCH_DATA_REMAINS;
4074 return DBUS_DISPATCH_COMPLETE;
4077 static DBusDispatchStatus
4078 _dbus_connection_get_dispatch_status_unlocked (DBusConnection *connection)
4080 HAVE_LOCK_CHECK (connection);
4082 if (connection->n_incoming > 0)
4083 return DBUS_DISPATCH_DATA_REMAINS;
4084 else if (!_dbus_transport_queue_messages (connection->transport))
4085 return DBUS_DISPATCH_NEED_MEMORY;
4088 DBusDispatchStatus status;
4089 dbus_bool_t is_connected;
4091 status = _dbus_transport_get_dispatch_status (connection->transport);
4092 is_connected = _dbus_transport_get_is_connected (connection->transport);
4094 _dbus_verbose ("dispatch status = %s is_connected = %d\n",
4095 DISPATCH_STATUS_NAME (status), is_connected);
4099 /* It's possible this would be better done by having an explicit
4100 * notification from _dbus_transport_disconnect() that would
4101 * synchronously do this, instead of waiting for the next dispatch
4102 * status check. However, probably not good to change until it causes
4105 notify_disconnected_unlocked (connection);
4107 /* I'm not sure this is needed; the idea is that we want to
4108 * queue the Disconnected only after we've read all the
4109 * messages, but if we're disconnected maybe we are guaranteed
4110 * to have read them all ?
4112 if (status == DBUS_DISPATCH_COMPLETE)
4113 status = notify_disconnected_and_dispatch_complete_unlocked (connection);
4116 if (status != DBUS_DISPATCH_COMPLETE)
4118 else if (connection->n_incoming > 0)
4119 return DBUS_DISPATCH_DATA_REMAINS;
4121 return DBUS_DISPATCH_COMPLETE;
4126 _dbus_connection_update_dispatch_status_and_unlock (DBusConnection *connection,
4127 DBusDispatchStatus new_status)
4129 dbus_bool_t changed;
4130 DBusDispatchStatusFunction function;
4133 HAVE_LOCK_CHECK (connection);
4135 _dbus_connection_ref_unlocked (connection);
4137 changed = new_status != connection->last_dispatch_status;
4139 connection->last_dispatch_status = new_status;
4141 function = connection->dispatch_status_function;
4142 data = connection->dispatch_status_data;
4144 if (connection->disconnected_message_arrived &&
4145 !connection->disconnected_message_processed)
4147 connection->disconnected_message_processed = TRUE;
4149 /* this does an unref, but we have a ref
4150 * so we should not run the finalizer here
4153 connection_forget_shared_unlocked (connection);
4155 if (connection->exit_on_disconnect)
4157 CONNECTION_UNLOCK (connection);
4159 _dbus_verbose ("Exiting on Disconnected signal\n");
4161 _dbus_assert_not_reached ("Call to exit() returned");
4165 /* We drop the lock */
4166 CONNECTION_UNLOCK (connection);
4168 if (changed && function)
4170 _dbus_verbose ("Notifying of change to dispatch status of %p now %d (%s)\n",
4171 connection, new_status,
4172 DISPATCH_STATUS_NAME (new_status));
4173 (* function) (connection, new_status, data);
4176 dbus_connection_unref (connection);
4180 * Gets the current state of the incoming message queue.
4181 * #DBUS_DISPATCH_DATA_REMAINS indicates that the message queue
4182 * may contain messages. #DBUS_DISPATCH_COMPLETE indicates that the
4183 * incoming queue is empty. #DBUS_DISPATCH_NEED_MEMORY indicates that
4184 * there could be data, but we can't know for sure without more
4187 * To process the incoming message queue, use dbus_connection_dispatch()
4188 * or (in rare cases) dbus_connection_pop_message().
4190 * Note, #DBUS_DISPATCH_DATA_REMAINS really means that either we
4191 * have messages in the queue, or we have raw bytes buffered up
4192 * that need to be parsed. When these bytes are parsed, they
4193 * may not add up to an entire message. Thus, it's possible
4194 * to see a status of #DBUS_DISPATCH_DATA_REMAINS but not
4195 * have a message yet.
4197 * In particular this happens on initial connection, because all sorts
4198 * of authentication protocol stuff has to be parsed before the
4199 * first message arrives.
4201 * @param connection the connection.
4202 * @returns current dispatch status
4205 dbus_connection_get_dispatch_status (DBusConnection *connection)
4207 DBusDispatchStatus status;
4209 _dbus_return_val_if_fail (connection != NULL, DBUS_DISPATCH_COMPLETE);
4211 _dbus_verbose ("%s start\n", _DBUS_FUNCTION_NAME);
4213 CONNECTION_LOCK (connection);
4215 status = _dbus_connection_get_dispatch_status_unlocked (connection);
4217 CONNECTION_UNLOCK (connection);
4223 * Filter funtion for handling the Peer standard interface.
4225 static DBusHandlerResult
4226 _dbus_connection_peer_filter_unlocked_no_update (DBusConnection *connection,
4227 DBusMessage *message)
4229 if (connection->route_peer_messages && dbus_message_get_destination (message) != NULL)
4231 /* This means we're letting the bus route this message */
4232 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
4234 else if (dbus_message_is_method_call (message,
4235 DBUS_INTERFACE_PEER,
4241 ret = dbus_message_new_method_return (message);
4243 return DBUS_HANDLER_RESULT_NEED_MEMORY;
4245 sent = _dbus_connection_send_unlocked_no_update (connection, ret, NULL);
4247 dbus_message_unref (ret);
4250 return DBUS_HANDLER_RESULT_NEED_MEMORY;
4252 return DBUS_HANDLER_RESULT_HANDLED;
4254 else if (dbus_message_is_method_call (message,
4255 DBUS_INTERFACE_PEER,
4262 ret = dbus_message_new_method_return (message);
4264 return DBUS_HANDLER_RESULT_NEED_MEMORY;
4267 _dbus_string_init (&uuid);
4268 if (_dbus_get_local_machine_uuid_encoded (&uuid))
4270 const char *v_STRING = _dbus_string_get_const_data (&uuid);
4271 if (dbus_message_append_args (ret,
4272 DBUS_TYPE_STRING, &v_STRING,
4275 sent = _dbus_connection_send_unlocked_no_update (connection, ret, NULL);
4278 _dbus_string_free (&uuid);
4280 dbus_message_unref (ret);
4283 return DBUS_HANDLER_RESULT_NEED_MEMORY;
4285 return DBUS_HANDLER_RESULT_HANDLED;
4287 else if (dbus_message_has_interface (message, DBUS_INTERFACE_PEER))
4289 /* We need to bounce anything else with this interface, otherwise apps
4290 * could start extending the interface and when we added extensions
4291 * here to DBusConnection we'd break those apps.
4297 ret = dbus_message_new_error (message,
4298 DBUS_ERROR_UNKNOWN_METHOD,
4299 "Unknown method invoked on org.freedesktop.DBus.Peer interface");
4301 return DBUS_HANDLER_RESULT_NEED_MEMORY;
4303 sent = _dbus_connection_send_unlocked_no_update (connection, ret, NULL);
4305 dbus_message_unref (ret);
4308 return DBUS_HANDLER_RESULT_NEED_MEMORY;
4310 return DBUS_HANDLER_RESULT_HANDLED;
4314 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
4319 * Processes all builtin filter functions
4321 * If the spec specifies a standard interface
4322 * they should be processed from this method
4324 static DBusHandlerResult
4325 _dbus_connection_run_builtin_filters_unlocked_no_update (DBusConnection *connection,
4326 DBusMessage *message)
4328 /* We just run one filter for now but have the option to run more
4329 if the spec calls for it in the future */
4331 return _dbus_connection_peer_filter_unlocked_no_update (connection, message);
4335 * Processes any incoming data.
4337 * If there's incoming raw data that has not yet been parsed, it is
4338 * parsed, which may or may not result in adding messages to the
4341 * The incoming data buffer is filled when the connection reads from
4342 * its underlying transport (such as a socket). Reading usually
4343 * happens in dbus_watch_handle() or dbus_connection_read_write().
4345 * If there are complete messages in the incoming queue,
4346 * dbus_connection_dispatch() removes one message from the queue and
4347 * processes it. Processing has three steps.
4349 * First, any method replies are passed to #DBusPendingCall or
4350 * dbus_connection_send_with_reply_and_block() in order to
4351 * complete the pending method call.
4353 * Second, any filters registered with dbus_connection_add_filter()
4354 * are run. If any filter returns #DBUS_HANDLER_RESULT_HANDLED
4355 * then processing stops after that filter.
4357 * Third, if the message is a method call it is forwarded to
4358 * any registered object path handlers added with
4359 * dbus_connection_register_object_path() or
4360 * dbus_connection_register_fallback().
4362 * A single call to dbus_connection_dispatch() will process at most
4363 * one message; it will not clear the entire message queue.
4365 * Be careful about calling dbus_connection_dispatch() from inside a
4366 * message handler, i.e. calling dbus_connection_dispatch()
4367 * recursively. If threads have been initialized with a recursive
4368 * mutex function, then this will not deadlock; however, it can
4369 * certainly confuse your application.
4371 * @todo some FIXME in here about handling DBUS_HANDLER_RESULT_NEED_MEMORY
4373 * @param connection the connection
4374 * @returns dispatch status, see dbus_connection_get_dispatch_status()
4377 dbus_connection_dispatch (DBusConnection *connection)
4379 DBusMessage *message;
4380 DBusList *link, *filter_list_copy, *message_link;
4381 DBusHandlerResult result;
4382 DBusPendingCall *pending;
4383 dbus_int32_t reply_serial;
4384 DBusDispatchStatus status;
4386 _dbus_return_val_if_fail (connection != NULL, DBUS_DISPATCH_COMPLETE);
4388 _dbus_verbose ("%s\n", _DBUS_FUNCTION_NAME);
4390 CONNECTION_LOCK (connection);
4391 status = _dbus_connection_get_dispatch_status_unlocked (connection);
4392 if (status != DBUS_DISPATCH_DATA_REMAINS)
4394 /* unlocks and calls out to user code */
4395 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
4399 /* We need to ref the connection since the callback could potentially
4400 * drop the last ref to it
4402 _dbus_connection_ref_unlocked (connection);
4404 _dbus_connection_acquire_dispatch (connection);
4405 HAVE_LOCK_CHECK (connection);
4407 message_link = _dbus_connection_pop_message_link_unlocked (connection);
4408 if (message_link == NULL)
4410 /* another thread dispatched our stuff */
4412 _dbus_verbose ("another thread dispatched message (during acquire_dispatch above)\n");
4414 _dbus_connection_release_dispatch (connection);
4416 status = _dbus_connection_get_dispatch_status_unlocked (connection);
4418 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
4420 dbus_connection_unref (connection);
4425 message = message_link->data;
4427 _dbus_verbose (" dispatching message %p (%d %s %s '%s')\n",
4429 dbus_message_get_type (message),
4430 dbus_message_get_interface (message) ?
4431 dbus_message_get_interface (message) :
4433 dbus_message_get_member (message) ?
4434 dbus_message_get_member (message) :
4436 dbus_message_get_signature (message));
4438 result = DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
4440 /* Pending call handling must be first, because if you do
4441 * dbus_connection_send_with_reply_and_block() or
4442 * dbus_pending_call_block() then no handlers/filters will be run on
4443 * the reply. We want consistent semantics in the case where we
4444 * dbus_connection_dispatch() the reply.
4447 reply_serial = dbus_message_get_reply_serial (message);
4448 pending = _dbus_hash_table_lookup_int (connection->pending_replies,
4452 _dbus_verbose ("Dispatching a pending reply\n");
4453 complete_pending_call_and_unlock (connection, pending, message);
4454 pending = NULL; /* it's probably unref'd */
4456 CONNECTION_LOCK (connection);
4457 _dbus_verbose ("pending call completed in dispatch\n");
4458 result = DBUS_HANDLER_RESULT_HANDLED;
4462 result = _dbus_connection_run_builtin_filters_unlocked_no_update (connection, message);
4463 if (result != DBUS_HANDLER_RESULT_NOT_YET_HANDLED)
4466 if (!_dbus_list_copy (&connection->filter_list, &filter_list_copy))
4468 _dbus_connection_release_dispatch (connection);
4469 HAVE_LOCK_CHECK (connection);
4471 _dbus_connection_failed_pop (connection, message_link);
4473 /* unlocks and calls user code */
4474 _dbus_connection_update_dispatch_status_and_unlock (connection,
4475 DBUS_DISPATCH_NEED_MEMORY);
4478 dbus_pending_call_unref (pending);
4479 dbus_connection_unref (connection);
4481 return DBUS_DISPATCH_NEED_MEMORY;
4484 _dbus_list_foreach (&filter_list_copy,
4485 (DBusForeachFunction)_dbus_message_filter_ref,
4488 /* We're still protected from dispatch() reentrancy here
4489 * since we acquired the dispatcher
4491 CONNECTION_UNLOCK (connection);
4493 link = _dbus_list_get_first_link (&filter_list_copy);
4494 while (link != NULL)
4496 DBusMessageFilter *filter = link->data;
4497 DBusList *next = _dbus_list_get_next_link (&filter_list_copy, link);
4499 if (filter->function == NULL)
4501 _dbus_verbose (" filter was removed in a callback function\n");
4506 _dbus_verbose (" running filter on message %p\n", message);
4507 result = (* filter->function) (connection, message, filter->user_data);
4509 if (result != DBUS_HANDLER_RESULT_NOT_YET_HANDLED)
4515 _dbus_list_foreach (&filter_list_copy,
4516 (DBusForeachFunction)_dbus_message_filter_unref,
4518 _dbus_list_clear (&filter_list_copy);
4520 CONNECTION_LOCK (connection);
4522 if (result == DBUS_HANDLER_RESULT_NEED_MEMORY)
4524 _dbus_verbose ("No memory in %s\n", _DBUS_FUNCTION_NAME);
4527 else if (result == DBUS_HANDLER_RESULT_HANDLED)
4529 _dbus_verbose ("filter handled message in dispatch\n");
4533 /* We're still protected from dispatch() reentrancy here
4534 * since we acquired the dispatcher
4536 _dbus_verbose (" running object path dispatch on message %p (%d %s %s '%s')\n",
4538 dbus_message_get_type (message),
4539 dbus_message_get_interface (message) ?
4540 dbus_message_get_interface (message) :
4542 dbus_message_get_member (message) ?
4543 dbus_message_get_member (message) :
4545 dbus_message_get_signature (message));
4547 HAVE_LOCK_CHECK (connection);
4548 result = _dbus_object_tree_dispatch_and_unlock (connection->objects,
4551 CONNECTION_LOCK (connection);
4553 if (result != DBUS_HANDLER_RESULT_NOT_YET_HANDLED)
4555 _dbus_verbose ("object tree handled message in dispatch\n");
4559 if (dbus_message_get_type (message) == DBUS_MESSAGE_TYPE_METHOD_CALL)
4563 DBusPreallocatedSend *preallocated;
4565 _dbus_verbose (" sending error %s\n",
4566 DBUS_ERROR_UNKNOWN_METHOD);
4568 if (!_dbus_string_init (&str))
4570 result = DBUS_HANDLER_RESULT_NEED_MEMORY;
4571 _dbus_verbose ("no memory for error string in dispatch\n");
4575 if (!_dbus_string_append_printf (&str,
4576 "Method \"%s\" with signature \"%s\" on interface \"%s\" doesn't exist\n",
4577 dbus_message_get_member (message),
4578 dbus_message_get_signature (message),
4579 dbus_message_get_interface (message)))
4581 _dbus_string_free (&str);
4582 result = DBUS_HANDLER_RESULT_NEED_MEMORY;
4583 _dbus_verbose ("no memory for error string in dispatch\n");
4587 reply = dbus_message_new_error (message,
4588 DBUS_ERROR_UNKNOWN_METHOD,
4589 _dbus_string_get_const_data (&str));
4590 _dbus_string_free (&str);
4594 result = DBUS_HANDLER_RESULT_NEED_MEMORY;
4595 _dbus_verbose ("no memory for error reply in dispatch\n");
4599 preallocated = _dbus_connection_preallocate_send_unlocked (connection);
4601 if (preallocated == NULL)
4603 dbus_message_unref (reply);
4604 result = DBUS_HANDLER_RESULT_NEED_MEMORY;
4605 _dbus_verbose ("no memory for error send in dispatch\n");
4609 _dbus_connection_send_preallocated_unlocked_no_update (connection, preallocated,
4612 dbus_message_unref (reply);
4614 result = DBUS_HANDLER_RESULT_HANDLED;
4617 _dbus_verbose (" done dispatching %p (%d %s %s '%s') on connection %p\n", message,
4618 dbus_message_get_type (message),
4619 dbus_message_get_interface (message) ?
4620 dbus_message_get_interface (message) :
4622 dbus_message_get_member (message) ?
4623 dbus_message_get_member (message) :
4625 dbus_message_get_signature (message),
4629 if (result == DBUS_HANDLER_RESULT_NEED_MEMORY)
4631 _dbus_verbose ("out of memory in %s\n", _DBUS_FUNCTION_NAME);
4633 /* Put message back, and we'll start over.
4634 * Yes this means handlers must be idempotent if they
4635 * don't return HANDLED; c'est la vie.
4637 _dbus_connection_putback_message_link_unlocked (connection,
4642 _dbus_verbose (" ... done dispatching in %s\n", _DBUS_FUNCTION_NAME);
4644 _dbus_list_free_link (message_link);
4645 dbus_message_unref (message); /* don't want the message to count in max message limits
4646 * in computing dispatch status below
4650 _dbus_connection_release_dispatch (connection);
4651 HAVE_LOCK_CHECK (connection);
4653 _dbus_verbose ("%s before final status update\n", _DBUS_FUNCTION_NAME);
4654 status = _dbus_connection_get_dispatch_status_unlocked (connection);
4656 /* unlocks and calls user code */
4657 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
4659 dbus_connection_unref (connection);
4665 * Sets the watch functions for the connection. These functions are
4666 * responsible for making the application's main loop aware of file
4667 * descriptors that need to be monitored for events, using select() or
4668 * poll(). When using Qt, typically the DBusAddWatchFunction would
4669 * create a QSocketNotifier. When using GLib, the DBusAddWatchFunction
4670 * could call g_io_add_watch(), or could be used as part of a more
4671 * elaborate GSource. Note that when a watch is added, it may
4674 * The DBusWatchToggledFunction notifies the application that the
4675 * watch has been enabled or disabled. Call dbus_watch_get_enabled()
4676 * to check this. A disabled watch should have no effect, and enabled
4677 * watch should be added to the main loop. This feature is used
4678 * instead of simply adding/removing the watch because
4679 * enabling/disabling can be done without memory allocation. The
4680 * toggled function may be NULL if a main loop re-queries
4681 * dbus_watch_get_enabled() every time anyway.
4683 * The DBusWatch can be queried for the file descriptor to watch using
4684 * dbus_watch_get_unix_fd() or dbus_watch_get_socket(), and for the
4685 * events to watch for using dbus_watch_get_flags(). The flags
4686 * returned by dbus_watch_get_flags() will only contain
4687 * DBUS_WATCH_READABLE and DBUS_WATCH_WRITABLE, never
4688 * DBUS_WATCH_HANGUP or DBUS_WATCH_ERROR; all watches implicitly
4689 * include a watch for hangups, errors, and other exceptional
4692 * Once a file descriptor becomes readable or writable, or an exception
4693 * occurs, dbus_watch_handle() should be called to
4694 * notify the connection of the file descriptor's condition.
4696 * dbus_watch_handle() cannot be called during the
4697 * DBusAddWatchFunction, as the connection will not be ready to handle
4700 * It is not allowed to reference a DBusWatch after it has been passed
4701 * to remove_function.
4703 * If #FALSE is returned due to lack of memory, the failure may be due
4704 * to a #FALSE return from the new add_function. If so, the
4705 * add_function may have been called successfully one or more times,
4706 * but the remove_function will also have been called to remove any
4707 * successful adds. i.e. if #FALSE is returned the net result
4708 * should be that dbus_connection_set_watch_functions() has no effect,
4709 * but the add_function and remove_function may have been called.
4711 * @todo We need to drop the lock when we call the
4712 * add/remove/toggled functions which can be a side effect
4713 * of setting the watch functions.
4715 * @param connection the connection.
4716 * @param add_function function to begin monitoring a new descriptor.
4717 * @param remove_function function to stop monitoring a descriptor.
4718 * @param toggled_function function to notify of enable/disable
4719 * @param data data to pass to add_function and remove_function.
4720 * @param free_data_function function to be called to free the data.
4721 * @returns #FALSE on failure (no memory)
4724 dbus_connection_set_watch_functions (DBusConnection *connection,
4725 DBusAddWatchFunction add_function,
4726 DBusRemoveWatchFunction remove_function,
4727 DBusWatchToggledFunction toggled_function,
4729 DBusFreeFunction free_data_function)
4732 DBusWatchList *watches;
4734 _dbus_return_val_if_fail (connection != NULL, FALSE);
4736 CONNECTION_LOCK (connection);
4738 #ifndef DBUS_DISABLE_CHECKS
4739 if (connection->watches == NULL)
4741 _dbus_warn_check_failed ("Re-entrant call to %s is not allowed\n",
4742 _DBUS_FUNCTION_NAME);
4747 /* ref connection for slightly better reentrancy */
4748 _dbus_connection_ref_unlocked (connection);
4750 /* This can call back into user code, and we need to drop the
4751 * connection lock when it does. This is kind of a lame
4754 watches = connection->watches;
4755 connection->watches = NULL;
4756 CONNECTION_UNLOCK (connection);
4758 retval = _dbus_watch_list_set_functions (watches,
4759 add_function, remove_function,
4761 data, free_data_function);
4762 CONNECTION_LOCK (connection);
4763 connection->watches = watches;
4765 CONNECTION_UNLOCK (connection);
4766 /* drop our paranoid refcount */
4767 dbus_connection_unref (connection);
4773 * Sets the timeout functions for the connection. These functions are
4774 * responsible for making the application's main loop aware of timeouts.
4775 * When using Qt, typically the DBusAddTimeoutFunction would create a
4776 * QTimer. When using GLib, the DBusAddTimeoutFunction would call
4779 * The DBusTimeoutToggledFunction notifies the application that the
4780 * timeout has been enabled or disabled. Call
4781 * dbus_timeout_get_enabled() to check this. A disabled timeout should
4782 * have no effect, and enabled timeout should be added to the main
4783 * loop. This feature is used instead of simply adding/removing the
4784 * timeout because enabling/disabling can be done without memory
4785 * allocation. With Qt, QTimer::start() and QTimer::stop() can be used
4786 * to enable and disable. The toggled function may be NULL if a main
4787 * loop re-queries dbus_timeout_get_enabled() every time anyway.
4788 * Whenever a timeout is toggled, its interval may change.
4790 * The DBusTimeout can be queried for the timer interval using
4791 * dbus_timeout_get_interval(). dbus_timeout_handle() should be called
4792 * repeatedly, each time the interval elapses, starting after it has
4793 * elapsed once. The timeout stops firing when it is removed with the
4794 * given remove_function. The timer interval may change whenever the
4795 * timeout is added, removed, or toggled.
4797 * @param connection the connection.
4798 * @param add_function function to add a timeout.
4799 * @param remove_function function to remove a timeout.
4800 * @param toggled_function function to notify of enable/disable
4801 * @param data data to pass to add_function and remove_function.
4802 * @param free_data_function function to be called to free the data.
4803 * @returns #FALSE on failure (no memory)
4806 dbus_connection_set_timeout_functions (DBusConnection *connection,
4807 DBusAddTimeoutFunction add_function,
4808 DBusRemoveTimeoutFunction remove_function,
4809 DBusTimeoutToggledFunction toggled_function,
4811 DBusFreeFunction free_data_function)
4814 DBusTimeoutList *timeouts;
4816 _dbus_return_val_if_fail (connection != NULL, FALSE);
4818 CONNECTION_LOCK (connection);
4820 #ifndef DBUS_DISABLE_CHECKS
4821 if (connection->timeouts == NULL)
4823 _dbus_warn_check_failed ("Re-entrant call to %s is not allowed\n",
4824 _DBUS_FUNCTION_NAME);
4829 /* ref connection for slightly better reentrancy */
4830 _dbus_connection_ref_unlocked (connection);
4832 timeouts = connection->timeouts;
4833 connection->timeouts = NULL;
4834 CONNECTION_UNLOCK (connection);
4836 retval = _dbus_timeout_list_set_functions (timeouts,
4837 add_function, remove_function,
4839 data, free_data_function);
4840 CONNECTION_LOCK (connection);
4841 connection->timeouts = timeouts;
4843 CONNECTION_UNLOCK (connection);
4844 /* drop our paranoid refcount */
4845 dbus_connection_unref (connection);
4851 * Sets the mainloop wakeup function for the connection. This function
4852 * is responsible for waking up the main loop (if its sleeping in
4853 * another thread) when some some change has happened to the
4854 * connection that the mainloop needs to reconsider (e.g. a message
4855 * has been queued for writing). When using Qt, this typically
4856 * results in a call to QEventLoop::wakeUp(). When using GLib, it
4857 * would call g_main_context_wakeup().
4859 * @param connection the connection.
4860 * @param wakeup_main_function function to wake up the mainloop
4861 * @param data data to pass wakeup_main_function
4862 * @param free_data_function function to be called to free the data.
4865 dbus_connection_set_wakeup_main_function (DBusConnection *connection,
4866 DBusWakeupMainFunction wakeup_main_function,
4868 DBusFreeFunction free_data_function)
4871 DBusFreeFunction old_free_data;
4873 _dbus_return_if_fail (connection != NULL);
4875 CONNECTION_LOCK (connection);
4876 old_data = connection->wakeup_main_data;
4877 old_free_data = connection->free_wakeup_main_data;
4879 connection->wakeup_main_function = wakeup_main_function;
4880 connection->wakeup_main_data = data;
4881 connection->free_wakeup_main_data = free_data_function;
4883 CONNECTION_UNLOCK (connection);
4885 /* Callback outside the lock */
4887 (*old_free_data) (old_data);
4891 * Set a function to be invoked when the dispatch status changes.
4892 * If the dispatch status is #DBUS_DISPATCH_DATA_REMAINS, then
4893 * dbus_connection_dispatch() needs to be called to process incoming
4894 * messages. However, dbus_connection_dispatch() MUST NOT BE CALLED
4895 * from inside the DBusDispatchStatusFunction. Indeed, almost
4896 * any reentrancy in this function is a bad idea. Instead,
4897 * the DBusDispatchStatusFunction should simply save an indication
4898 * that messages should be dispatched later, when the main loop
4901 * If you don't set a dispatch status function, you have to be sure to
4902 * dispatch on every iteration of your main loop, especially if
4903 * dbus_watch_handle() or dbus_timeout_handle() were called.
4905 * @param connection the connection
4906 * @param function function to call on dispatch status changes
4907 * @param data data for function
4908 * @param free_data_function free the function data
4911 dbus_connection_set_dispatch_status_function (DBusConnection *connection,
4912 DBusDispatchStatusFunction function,
4914 DBusFreeFunction free_data_function)
4917 DBusFreeFunction old_free_data;
4919 _dbus_return_if_fail (connection != NULL);
4921 CONNECTION_LOCK (connection);
4922 old_data = connection->dispatch_status_data;
4923 old_free_data = connection->free_dispatch_status_data;
4925 connection->dispatch_status_function = function;
4926 connection->dispatch_status_data = data;
4927 connection->free_dispatch_status_data = free_data_function;
4929 CONNECTION_UNLOCK (connection);
4931 /* Callback outside the lock */
4933 (*old_free_data) (old_data);
4937 * Get the UNIX file descriptor of the connection, if any. This can
4938 * be used for SELinux access control checks with getpeercon() for
4939 * example. DO NOT read or write to the file descriptor, or try to
4940 * select() on it; use DBusWatch for main loop integration. Not all
4941 * connections will have a file descriptor. So for adding descriptors
4942 * to the main loop, use dbus_watch_get_unix_fd() and so forth.
4944 * If the connection is socket-based, you can also use
4945 * dbus_connection_get_socket(), which will work on Windows too.
4946 * This function always fails on Windows.
4948 * Right now the returned descriptor is always a socket, but
4949 * that is not guaranteed.
4951 * @param connection the connection
4952 * @param fd return location for the file descriptor.
4953 * @returns #TRUE if fd is successfully obtained.
4956 dbus_connection_get_unix_fd (DBusConnection *connection,
4959 _dbus_return_val_if_fail (connection != NULL, FALSE);
4960 _dbus_return_val_if_fail (connection->transport != NULL, FALSE);
4963 /* FIXME do this on a lower level */
4967 return dbus_connection_get_socket(connection, fd);
4971 * Gets the underlying Windows or UNIX socket file descriptor
4972 * of the connection, if any. DO NOT read or write to the file descriptor, or try to
4973 * select() on it; use DBusWatch for main loop integration. Not all
4974 * connections will have a socket. So for adding descriptors
4975 * to the main loop, use dbus_watch_get_socket() and so forth.
4977 * If the connection is not socket-based, this function will return FALSE,
4978 * even if the connection does have a file descriptor of some kind.
4979 * i.e. this function always returns specifically a socket file descriptor.
4981 * @param connection the connection
4982 * @param fd return location for the file descriptor.
4983 * @returns #TRUE if fd is successfully obtained.
4986 dbus_connection_get_socket(DBusConnection *connection,
4991 _dbus_return_val_if_fail (connection != NULL, FALSE);
4992 _dbus_return_val_if_fail (connection->transport != NULL, FALSE);
4994 CONNECTION_LOCK (connection);
4996 retval = _dbus_transport_get_socket_fd (connection->transport,
4999 CONNECTION_UNLOCK (connection);
5006 * Gets the UNIX user ID of the connection if known. Returns #TRUE if
5007 * the uid is filled in. Always returns #FALSE on non-UNIX platforms
5008 * for now, though in theory someone could hook Windows to NIS or
5009 * something. Always returns #FALSE prior to authenticating the
5012 * The UID is only read by servers from clients; clients can't usually
5013 * get the UID of servers, because servers do not authenticate to
5014 * clients. The returned UID is the UID the connection authenticated
5017 * The message bus is a server and the apps connecting to the bus
5020 * You can ask the bus to tell you the UID of another connection though
5021 * if you like; this is done with dbus_bus_get_unix_user().
5023 * @param connection the connection
5024 * @param uid return location for the user ID
5025 * @returns #TRUE if uid is filled in with a valid user ID
5028 dbus_connection_get_unix_user (DBusConnection *connection,
5033 _dbus_return_val_if_fail (connection != NULL, FALSE);
5034 _dbus_return_val_if_fail (uid != NULL, FALSE);
5036 CONNECTION_LOCK (connection);
5038 if (!_dbus_transport_get_is_authenticated (connection->transport))
5041 result = _dbus_transport_get_unix_user (connection->transport,
5045 _dbus_assert (!result);
5048 CONNECTION_UNLOCK (connection);
5054 * Gets the process ID of the connection if any.
5055 * Returns #TRUE if the pid is filled in.
5056 * Always returns #FALSE prior to authenticating the
5059 * @param connection the connection
5060 * @param pid return location for the process ID
5061 * @returns #TRUE if uid is filled in with a valid process ID
5064 dbus_connection_get_unix_process_id (DBusConnection *connection,
5069 _dbus_return_val_if_fail (connection != NULL, FALSE);
5070 _dbus_return_val_if_fail (pid != NULL, FALSE);
5072 CONNECTION_LOCK (connection);
5074 if (!_dbus_transport_get_is_authenticated (connection->transport))
5077 result = _dbus_transport_get_unix_process_id (connection->transport,
5080 _dbus_assert (!result);
5083 CONNECTION_UNLOCK (connection);
5089 * Gets the ADT audit data of the connection if any.
5090 * Returns #TRUE if the structure pointer is returned.
5091 * Always returns #FALSE prior to authenticating the
5094 * @param connection the connection
5095 * @param data return location for audit data
5096 * @returns #TRUE if audit data is filled in with a valid ucred pointer
5099 dbus_connection_get_adt_audit_session_data (DBusConnection *connection,
5101 dbus_int32_t *data_size)
5105 _dbus_return_val_if_fail (connection != NULL, FALSE);
5106 _dbus_return_val_if_fail (data != NULL, FALSE);
5107 _dbus_return_val_if_fail (data_size != NULL, FALSE);
5109 CONNECTION_LOCK (connection);
5111 if (!_dbus_transport_get_is_authenticated (connection->transport))
5114 result = _dbus_transport_get_adt_audit_session_data (connection->transport,
5117 CONNECTION_UNLOCK (connection);
5123 * Sets a predicate function used to determine whether a given user ID
5124 * is allowed to connect. When an incoming connection has
5125 * authenticated with a particular user ID, this function is called;
5126 * if it returns #TRUE, the connection is allowed to proceed,
5127 * otherwise the connection is disconnected.
5129 * If the function is set to #NULL (as it is by default), then
5130 * only the same UID as the server process will be allowed to
5131 * connect. Also, root is always allowed to connect.
5133 * On Windows, the function will be set and its free_data_function will
5134 * be invoked when the connection is freed or a new function is set.
5135 * However, the function will never be called, because there are
5136 * no UNIX user ids to pass to it, or at least none of the existing
5137 * auth protocols would allow authenticating as a UNIX user on Windows.
5139 * @param connection the connection
5140 * @param function the predicate
5141 * @param data data to pass to the predicate
5142 * @param free_data_function function to free the data
5145 dbus_connection_set_unix_user_function (DBusConnection *connection,
5146 DBusAllowUnixUserFunction function,
5148 DBusFreeFunction free_data_function)
5150 void *old_data = NULL;
5151 DBusFreeFunction old_free_function = NULL;
5153 _dbus_return_if_fail (connection != NULL);
5155 CONNECTION_LOCK (connection);
5156 _dbus_transport_set_unix_user_function (connection->transport,
5157 function, data, free_data_function,
5158 &old_data, &old_free_function);
5159 CONNECTION_UNLOCK (connection);
5161 if (old_free_function != NULL)
5162 (* old_free_function) (old_data);
5166 * Gets the Windows user SID of the connection if known. Returns
5167 * #TRUE if the ID is filled in. Always returns #FALSE on non-Windows
5168 * platforms for now, though in theory someone could hook UNIX to
5169 * Active Directory or something. Always returns #FALSE prior to
5170 * authenticating the connection.
5172 * The user is only read by servers from clients; clients can't usually
5173 * get the user of servers, because servers do not authenticate to
5174 * clients. The returned user is the user the connection authenticated
5177 * The message bus is a server and the apps connecting to the bus
5180 * The returned user string has to be freed with dbus_free().
5182 * The return value indicates whether the user SID is available;
5183 * if it's available but we don't have the memory to copy it,
5184 * then the return value is #TRUE and #NULL is given as the SID.
5186 * @todo We would like to be able to say "You can ask the bus to tell
5187 * you the user of another connection though if you like; this is done
5188 * with dbus_bus_get_windows_user()." But this has to be implemented
5189 * in bus/driver.c and dbus/dbus-bus.c, and is pointless anyway
5190 * since on Windows we only use the session bus for now.
5192 * @param connection the connection
5193 * @param windows_sid_p return location for an allocated copy of the user ID, or #NULL if no memory
5194 * @returns #TRUE if user is available (returned value may be #NULL anyway if no memory)
5197 dbus_connection_get_windows_user (DBusConnection *connection,
5198 char **windows_sid_p)
5202 _dbus_return_val_if_fail (connection != NULL, FALSE);
5203 _dbus_return_val_if_fail (windows_sid_p != NULL, FALSE);
5205 CONNECTION_LOCK (connection);
5207 if (!_dbus_transport_get_is_authenticated (connection->transport))
5210 result = _dbus_transport_get_windows_user (connection->transport,
5214 _dbus_assert (!result);
5217 CONNECTION_UNLOCK (connection);
5223 * Sets a predicate function used to determine whether a given user ID
5224 * is allowed to connect. When an incoming connection has
5225 * authenticated with a particular user ID, this function is called;
5226 * if it returns #TRUE, the connection is allowed to proceed,
5227 * otherwise the connection is disconnected.
5229 * If the function is set to #NULL (as it is by default), then
5230 * only the same user owning the server process will be allowed to
5233 * On UNIX, the function will be set and its free_data_function will
5234 * be invoked when the connection is freed or a new function is set.
5235 * However, the function will never be called, because there is no
5236 * way right now to authenticate as a Windows user on UNIX.
5238 * @param connection the connection
5239 * @param function the predicate
5240 * @param data data to pass to the predicate
5241 * @param free_data_function function to free the data
5244 dbus_connection_set_windows_user_function (DBusConnection *connection,
5245 DBusAllowWindowsUserFunction function,
5247 DBusFreeFunction free_data_function)
5249 void *old_data = NULL;
5250 DBusFreeFunction old_free_function = NULL;
5252 _dbus_return_if_fail (connection != NULL);
5254 CONNECTION_LOCK (connection);
5255 _dbus_transport_set_windows_user_function (connection->transport,
5256 function, data, free_data_function,
5257 &old_data, &old_free_function);
5258 CONNECTION_UNLOCK (connection);
5260 if (old_free_function != NULL)
5261 (* old_free_function) (old_data);
5265 * This function must be called on the server side of a connection when the
5266 * connection is first seen in the #DBusNewConnectionFunction. If set to
5267 * #TRUE (the default is #FALSE), then the connection can proceed even if
5268 * the client does not authenticate as some user identity, i.e. clients
5269 * can connect anonymously.
5271 * This setting interacts with the available authorization mechanisms
5272 * (see dbus_server_set_auth_mechanisms()). Namely, an auth mechanism
5273 * such as ANONYMOUS that supports anonymous auth must be included in
5274 * the list of available mechanisms for anonymous login to work.
5276 * This setting also changes the default rule for connections
5277 * authorized as a user; normally, if a connection authorizes as
5278 * a user identity, it is permitted if the user identity is
5279 * root or the user identity matches the user identity of the server
5280 * process. If anonymous connections are allowed, however,
5281 * then any user identity is allowed.
5283 * You can override the rules for connections authorized as a
5284 * user identity with dbus_connection_set_unix_user_function()
5285 * and dbus_connection_set_windows_user_function().
5287 * @param connection the connection
5288 * @param value whether to allow authentication as an anonymous user
5291 dbus_connection_set_allow_anonymous (DBusConnection *connection,
5294 _dbus_return_if_fail (connection != NULL);
5296 CONNECTION_LOCK (connection);
5297 _dbus_transport_set_allow_anonymous (connection->transport, value);
5298 CONNECTION_UNLOCK (connection);
5303 * Normally #DBusConnection automatically handles all messages to the
5304 * org.freedesktop.DBus.Peer interface. However, the message bus wants
5305 * to be able to route methods on that interface through the bus and
5306 * to other applications. If routing peer messages is enabled, then
5307 * messages with the org.freedesktop.DBus.Peer interface that also
5308 * have a bus destination name set will not be automatically
5309 * handled by the #DBusConnection and instead will be dispatched
5310 * normally to the application.
5312 * If a normal application sets this flag, it can break things badly.
5313 * So don't set this unless you are the message bus.
5315 * @param connection the connection
5316 * @param value #TRUE to pass through org.freedesktop.DBus.Peer messages with a bus name set
5319 dbus_connection_set_route_peer_messages (DBusConnection *connection,
5322 _dbus_return_if_fail (connection != NULL);
5324 CONNECTION_LOCK (connection);
5325 connection->route_peer_messages = TRUE;
5326 CONNECTION_UNLOCK (connection);
5330 * Adds a message filter. Filters are handlers that are run on all
5331 * incoming messages, prior to the objects registered with
5332 * dbus_connection_register_object_path(). Filters are run in the
5333 * order that they were added. The same handler can be added as a
5334 * filter more than once, in which case it will be run more than once.
5335 * Filters added during a filter callback won't be run on the message
5338 * @todo we don't run filters on messages while blocking without
5339 * entering the main loop, since filters are run as part of
5340 * dbus_connection_dispatch(). This is probably a feature, as filters
5341 * could create arbitrary reentrancy. But kind of sucks if you're
5342 * trying to filter METHOD_RETURN for some reason.
5344 * @param connection the connection
5345 * @param function function to handle messages
5346 * @param user_data user data to pass to the function
5347 * @param free_data_function function to use for freeing user data
5348 * @returns #TRUE on success, #FALSE if not enough memory.
5351 dbus_connection_add_filter (DBusConnection *connection,
5352 DBusHandleMessageFunction function,
5354 DBusFreeFunction free_data_function)
5356 DBusMessageFilter *filter;
5358 _dbus_return_val_if_fail (connection != NULL, FALSE);
5359 _dbus_return_val_if_fail (function != NULL, FALSE);
5361 filter = dbus_new0 (DBusMessageFilter, 1);
5365 filter->refcount.value = 1;
5367 CONNECTION_LOCK (connection);
5369 if (!_dbus_list_append (&connection->filter_list,
5372 _dbus_message_filter_unref (filter);
5373 CONNECTION_UNLOCK (connection);
5377 /* Fill in filter after all memory allocated,
5378 * so we don't run the free_user_data_function
5379 * if the add_filter() fails
5382 filter->function = function;
5383 filter->user_data = user_data;
5384 filter->free_user_data_function = free_data_function;
5386 CONNECTION_UNLOCK (connection);
5391 * Removes a previously-added message filter. It is a programming
5392 * error to call this function for a handler that has not been added
5393 * as a filter. If the given handler was added more than once, only
5394 * one instance of it will be removed (the most recently-added
5397 * @param connection the connection
5398 * @param function the handler to remove
5399 * @param user_data user data for the handler to remove
5403 dbus_connection_remove_filter (DBusConnection *connection,
5404 DBusHandleMessageFunction function,
5408 DBusMessageFilter *filter;
5410 _dbus_return_if_fail (connection != NULL);
5411 _dbus_return_if_fail (function != NULL);
5413 CONNECTION_LOCK (connection);
5417 link = _dbus_list_get_last_link (&connection->filter_list);
5418 while (link != NULL)
5420 filter = link->data;
5422 if (filter->function == function &&
5423 filter->user_data == user_data)
5425 _dbus_list_remove_link (&connection->filter_list, link);
5426 filter->function = NULL;
5431 link = _dbus_list_get_prev_link (&connection->filter_list, link);
5435 CONNECTION_UNLOCK (connection);
5437 #ifndef DBUS_DISABLE_CHECKS
5440 _dbus_warn_check_failed ("Attempt to remove filter function %p user data %p, but no such filter has been added\n",
5441 function, user_data);
5446 /* Call application code */
5447 if (filter->free_user_data_function)
5448 (* filter->free_user_data_function) (filter->user_data);
5450 filter->free_user_data_function = NULL;
5451 filter->user_data = NULL;
5453 _dbus_message_filter_unref (filter);
5457 * Registers a handler for a given path in the object hierarchy.
5458 * The given vtable handles messages sent to exactly the given path.
5460 * @param connection the connection
5461 * @param path a '/' delimited string of path elements
5462 * @param vtable the virtual table
5463 * @param user_data data to pass to functions in the vtable
5464 * @param error address where an error can be returned
5465 * @returns #FALSE if an error (#DBUS_ERROR_NO_MEMORY or
5466 * #DBUS_ERROR_ADDRESS_IN_USE) is reported
5469 dbus_connection_try_register_object_path (DBusConnection *connection,
5471 const DBusObjectPathVTable *vtable,
5475 char **decomposed_path;
5478 _dbus_return_val_if_fail (connection != NULL, FALSE);
5479 _dbus_return_val_if_fail (path != NULL, FALSE);
5480 _dbus_return_val_if_fail (path[0] == '/', FALSE);
5481 _dbus_return_val_if_fail (vtable != NULL, FALSE);
5483 if (!_dbus_decompose_path (path, strlen (path), &decomposed_path, NULL))
5486 CONNECTION_LOCK (connection);
5488 retval = _dbus_object_tree_register (connection->objects,
5490 (const char **) decomposed_path, vtable,
5493 CONNECTION_UNLOCK (connection);
5495 dbus_free_string_array (decomposed_path);
5501 * Registers a handler for a given path in the object hierarchy.
5502 * The given vtable handles messages sent to exactly the given path.
5504 * It is a bug to call this function for object paths which already
5505 * have a handler. Use dbus_connection_try_register_object_path() if this
5506 * might be the case.
5508 * @param connection the connection
5509 * @param path a '/' delimited string of path elements
5510 * @param vtable the virtual table
5511 * @param user_data data to pass to functions in the vtable
5512 * @returns #FALSE if not enough memory
5515 dbus_connection_register_object_path (DBusConnection *connection,
5517 const DBusObjectPathVTable *vtable,
5520 char **decomposed_path;
5522 DBusError error = DBUS_ERROR_INIT;
5524 _dbus_return_val_if_fail (connection != NULL, FALSE);
5525 _dbus_return_val_if_fail (path != NULL, FALSE);
5526 _dbus_return_val_if_fail (path[0] == '/', FALSE);
5527 _dbus_return_val_if_fail (vtable != NULL, FALSE);
5529 if (!_dbus_decompose_path (path, strlen (path), &decomposed_path, NULL))
5532 CONNECTION_LOCK (connection);
5534 retval = _dbus_object_tree_register (connection->objects,
5536 (const char **) decomposed_path, vtable,
5539 CONNECTION_UNLOCK (connection);
5541 dbus_free_string_array (decomposed_path);
5543 if (dbus_error_has_name (&error, DBUS_ERROR_ADDRESS_IN_USE))
5545 _dbus_warn ("%s\n", error.message);
5546 dbus_error_free (&error);
5554 * Registers a fallback handler for a given subsection of the object
5555 * hierarchy. The given vtable handles messages at or below the given
5556 * path. You can use this to establish a default message handling
5557 * policy for a whole "subdirectory."
5559 * @param connection the connection
5560 * @param path a '/' delimited string of path elements
5561 * @param vtable the virtual table
5562 * @param user_data data to pass to functions in the vtable
5563 * @param error address where an error can be returned
5564 * @returns #FALSE if an error (#DBUS_ERROR_NO_MEMORY or
5565 * #DBUS_ERROR_ADDRESS_IN_USE) is reported
5568 dbus_connection_try_register_fallback (DBusConnection *connection,
5570 const DBusObjectPathVTable *vtable,
5574 char **decomposed_path;
5577 _dbus_return_val_if_fail (connection != NULL, FALSE);
5578 _dbus_return_val_if_fail (path != NULL, FALSE);
5579 _dbus_return_val_if_fail (path[0] == '/', FALSE);
5580 _dbus_return_val_if_fail (vtable != NULL, FALSE);
5582 if (!_dbus_decompose_path (path, strlen (path), &decomposed_path, NULL))
5585 CONNECTION_LOCK (connection);
5587 retval = _dbus_object_tree_register (connection->objects,
5589 (const char **) decomposed_path, vtable,
5592 CONNECTION_UNLOCK (connection);
5594 dbus_free_string_array (decomposed_path);
5600 * Registers a fallback handler for a given subsection of the object
5601 * hierarchy. The given vtable handles messages at or below the given
5602 * path. You can use this to establish a default message handling
5603 * policy for a whole "subdirectory."
5605 * It is a bug to call this function for object paths which already
5606 * have a handler. Use dbus_connection_try_register_fallback() if this
5607 * might be the case.
5609 * @param connection the connection
5610 * @param path a '/' delimited string of path elements
5611 * @param vtable the virtual table
5612 * @param user_data data to pass to functions in the vtable
5613 * @returns #FALSE if not enough memory
5616 dbus_connection_register_fallback (DBusConnection *connection,
5618 const DBusObjectPathVTable *vtable,
5621 char **decomposed_path;
5623 DBusError error = DBUS_ERROR_INIT;
5625 _dbus_return_val_if_fail (connection != NULL, FALSE);
5626 _dbus_return_val_if_fail (path != NULL, FALSE);
5627 _dbus_return_val_if_fail (path[0] == '/', FALSE);
5628 _dbus_return_val_if_fail (vtable != NULL, FALSE);
5630 if (!_dbus_decompose_path (path, strlen (path), &decomposed_path, NULL))
5633 CONNECTION_LOCK (connection);
5635 retval = _dbus_object_tree_register (connection->objects,
5637 (const char **) decomposed_path, vtable,
5640 CONNECTION_UNLOCK (connection);
5642 dbus_free_string_array (decomposed_path);
5644 if (dbus_error_has_name (&error, DBUS_ERROR_ADDRESS_IN_USE))
5646 _dbus_warn ("%s\n", error.message);
5647 dbus_error_free (&error);
5655 * Unregisters the handler registered with exactly the given path.
5656 * It's a bug to call this function for a path that isn't registered.
5657 * Can unregister both fallback paths and object paths.
5659 * @param connection the connection
5660 * @param path a '/' delimited string of path elements
5661 * @returns #FALSE if not enough memory
5664 dbus_connection_unregister_object_path (DBusConnection *connection,
5667 char **decomposed_path;
5669 _dbus_return_val_if_fail (connection != NULL, FALSE);
5670 _dbus_return_val_if_fail (path != NULL, FALSE);
5671 _dbus_return_val_if_fail (path[0] == '/', FALSE);
5673 if (!_dbus_decompose_path (path, strlen (path), &decomposed_path, NULL))
5676 CONNECTION_LOCK (connection);
5678 _dbus_object_tree_unregister_and_unlock (connection->objects, (const char **) decomposed_path);
5680 dbus_free_string_array (decomposed_path);
5686 * Gets the user data passed to dbus_connection_register_object_path()
5687 * or dbus_connection_register_fallback(). If nothing was registered
5688 * at this path, the data is filled in with #NULL.
5690 * @param connection the connection
5691 * @param path the path you registered with
5692 * @param data_p location to store the user data, or #NULL
5693 * @returns #FALSE if not enough memory
5696 dbus_connection_get_object_path_data (DBusConnection *connection,
5700 char **decomposed_path;
5702 _dbus_return_val_if_fail (connection != NULL, FALSE);
5703 _dbus_return_val_if_fail (path != NULL, FALSE);
5704 _dbus_return_val_if_fail (data_p != NULL, FALSE);
5708 if (!_dbus_decompose_path (path, strlen (path), &decomposed_path, NULL))
5711 CONNECTION_LOCK (connection);
5713 *data_p = _dbus_object_tree_get_user_data_unlocked (connection->objects, (const char**) decomposed_path);
5715 CONNECTION_UNLOCK (connection);
5717 dbus_free_string_array (decomposed_path);
5723 * Lists the registered fallback handlers and object path handlers at
5724 * the given parent_path. The returned array should be freed with
5725 * dbus_free_string_array().
5727 * @param connection the connection
5728 * @param parent_path the path to list the child handlers of
5729 * @param child_entries returns #NULL-terminated array of children
5730 * @returns #FALSE if no memory to allocate the child entries
5733 dbus_connection_list_registered (DBusConnection *connection,
5734 const char *parent_path,
5735 char ***child_entries)
5737 char **decomposed_path;
5739 _dbus_return_val_if_fail (connection != NULL, FALSE);
5740 _dbus_return_val_if_fail (parent_path != NULL, FALSE);
5741 _dbus_return_val_if_fail (parent_path[0] == '/', FALSE);
5742 _dbus_return_val_if_fail (child_entries != NULL, FALSE);
5744 if (!_dbus_decompose_path (parent_path, strlen (parent_path), &decomposed_path, NULL))
5747 CONNECTION_LOCK (connection);
5749 retval = _dbus_object_tree_list_registered_and_unlock (connection->objects,
5750 (const char **) decomposed_path,
5752 dbus_free_string_array (decomposed_path);
5757 static DBusDataSlotAllocator slot_allocator;
5758 _DBUS_DEFINE_GLOBAL_LOCK (connection_slots);
5761 * Allocates an integer ID to be used for storing application-specific
5762 * data on any DBusConnection. The allocated ID may then be used
5763 * with dbus_connection_set_data() and dbus_connection_get_data().
5764 * The passed-in slot must be initialized to -1, and is filled in
5765 * with the slot ID. If the passed-in slot is not -1, it's assumed
5766 * to be already allocated, and its refcount is incremented.
5768 * The allocated slot is global, i.e. all DBusConnection objects will
5769 * have a slot with the given integer ID reserved.
5771 * @param slot_p address of a global variable storing the slot
5772 * @returns #FALSE on failure (no memory)
5775 dbus_connection_allocate_data_slot (dbus_int32_t *slot_p)
5777 return _dbus_data_slot_allocator_alloc (&slot_allocator,
5778 &_DBUS_LOCK_NAME (connection_slots),
5783 * Deallocates a global ID for connection data slots.
5784 * dbus_connection_get_data() and dbus_connection_set_data() may no
5785 * longer be used with this slot. Existing data stored on existing
5786 * DBusConnection objects will be freed when the connection is
5787 * finalized, but may not be retrieved (and may only be replaced if
5788 * someone else reallocates the slot). When the refcount on the
5789 * passed-in slot reaches 0, it is set to -1.
5791 * @param slot_p address storing the slot to deallocate
5794 dbus_connection_free_data_slot (dbus_int32_t *slot_p)
5796 _dbus_return_if_fail (*slot_p >= 0);
5798 _dbus_data_slot_allocator_free (&slot_allocator, slot_p);
5802 * Stores a pointer on a DBusConnection, along
5803 * with an optional function to be used for freeing
5804 * the data when the data is set again, or when
5805 * the connection is finalized. The slot number
5806 * must have been allocated with dbus_connection_allocate_data_slot().
5808 * @param connection the connection
5809 * @param slot the slot number
5810 * @param data the data to store
5811 * @param free_data_func finalizer function for the data
5812 * @returns #TRUE if there was enough memory to store the data
5815 dbus_connection_set_data (DBusConnection *connection,
5818 DBusFreeFunction free_data_func)
5820 DBusFreeFunction old_free_func;
5824 _dbus_return_val_if_fail (connection != NULL, FALSE);
5825 _dbus_return_val_if_fail (slot >= 0, FALSE);
5827 CONNECTION_LOCK (connection);
5829 retval = _dbus_data_slot_list_set (&slot_allocator,
5830 &connection->slot_list,
5831 slot, data, free_data_func,
5832 &old_free_func, &old_data);
5834 CONNECTION_UNLOCK (connection);
5838 /* Do the actual free outside the connection lock */
5840 (* old_free_func) (old_data);
5847 * Retrieves data previously set with dbus_connection_set_data().
5848 * The slot must still be allocated (must not have been freed).
5850 * @param connection the connection
5851 * @param slot the slot to get data from
5852 * @returns the data, or #NULL if not found
5855 dbus_connection_get_data (DBusConnection *connection,
5860 _dbus_return_val_if_fail (connection != NULL, NULL);
5862 CONNECTION_LOCK (connection);
5864 res = _dbus_data_slot_list_get (&slot_allocator,
5865 &connection->slot_list,
5868 CONNECTION_UNLOCK (connection);
5874 * This function sets a global flag for whether dbus_connection_new()
5875 * will set SIGPIPE behavior to SIG_IGN.
5877 * @param will_modify_sigpipe #TRUE to allow sigpipe to be set to SIG_IGN
5880 dbus_connection_set_change_sigpipe (dbus_bool_t will_modify_sigpipe)
5882 _dbus_modify_sigpipe = will_modify_sigpipe != FALSE;
5886 * Specifies the maximum size message this connection is allowed to
5887 * receive. Larger messages will result in disconnecting the
5890 * @param connection a #DBusConnection
5891 * @param size maximum message size the connection can receive, in bytes
5894 dbus_connection_set_max_message_size (DBusConnection *connection,
5897 _dbus_return_if_fail (connection != NULL);
5899 CONNECTION_LOCK (connection);
5900 _dbus_transport_set_max_message_size (connection->transport,
5902 CONNECTION_UNLOCK (connection);
5906 * Gets the value set by dbus_connection_set_max_message_size().
5908 * @param connection the connection
5909 * @returns the max size of a single message
5912 dbus_connection_get_max_message_size (DBusConnection *connection)
5916 _dbus_return_val_if_fail (connection != NULL, 0);
5918 CONNECTION_LOCK (connection);
5919 res = _dbus_transport_get_max_message_size (connection->transport);
5920 CONNECTION_UNLOCK (connection);
5925 * Sets the maximum total number of bytes that can be used for all messages
5926 * received on this connection. Messages count toward the maximum until
5927 * they are finalized. When the maximum is reached, the connection will
5928 * not read more data until some messages are finalized.
5930 * The semantics of the maximum are: if outstanding messages are
5931 * already above the maximum, additional messages will not be read.
5932 * The semantics are not: if the next message would cause us to exceed
5933 * the maximum, we don't read it. The reason is that we don't know the
5934 * size of a message until after we read it.
5936 * Thus, the max live messages size can actually be exceeded
5937 * by up to the maximum size of a single message.
5939 * Also, if we read say 1024 bytes off the wire in a single read(),
5940 * and that contains a half-dozen small messages, we may exceed the
5941 * size max by that amount. But this should be inconsequential.
5943 * This does imply that we can't call read() with a buffer larger
5944 * than we're willing to exceed this limit by.
5946 * @param connection the connection
5947 * @param size the maximum size in bytes of all outstanding messages
5950 dbus_connection_set_max_received_size (DBusConnection *connection,
5953 _dbus_return_if_fail (connection != NULL);
5955 CONNECTION_LOCK (connection);
5956 _dbus_transport_set_max_received_size (connection->transport,
5958 CONNECTION_UNLOCK (connection);
5962 * Gets the value set by dbus_connection_set_max_received_size().
5964 * @param connection the connection
5965 * @returns the max size of all live messages
5968 dbus_connection_get_max_received_size (DBusConnection *connection)
5972 _dbus_return_val_if_fail (connection != NULL, 0);
5974 CONNECTION_LOCK (connection);
5975 res = _dbus_transport_get_max_received_size (connection->transport);
5976 CONNECTION_UNLOCK (connection);
5981 * Gets the approximate size in bytes of all messages in the outgoing
5982 * message queue. The size is approximate in that you shouldn't use
5983 * it to decide how many bytes to read off the network or anything
5984 * of that nature, as optimizations may choose to tell small white lies
5985 * to avoid performance overhead.
5987 * @param connection the connection
5988 * @returns the number of bytes that have been queued up but not sent
5991 dbus_connection_get_outgoing_size (DBusConnection *connection)
5995 _dbus_return_val_if_fail (connection != NULL, 0);
5997 CONNECTION_LOCK (connection);
5998 res = _dbus_counter_get_value (connection->outgoing_counter);
5999 CONNECTION_UNLOCK (connection);