1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* dbus-connection.c DBusConnection object
4 * Copyright (C) 2002-2006 Red Hat Inc.
6 * Licensed under the Academic Free License version 2.1
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #include "dbus-shared.h"
26 #include "dbus-connection.h"
27 #include "dbus-list.h"
28 #include "dbus-timeout.h"
29 #include "dbus-transport.h"
30 #include "dbus-watch.h"
31 #include "dbus-connection-internal.h"
32 #include "dbus-pending-call-internal.h"
33 #include "dbus-list.h"
34 #include "dbus-hash.h"
35 #include "dbus-message-internal.h"
36 #include "dbus-message-private.h"
37 #include "dbus-threads.h"
38 #include "dbus-protocol.h"
39 #include "dbus-dataslot.h"
40 #include "dbus-string.h"
41 #include "dbus-signature.h"
42 #include "dbus-pending-call.h"
43 #include "dbus-object-tree.h"
44 #include "dbus-threads-internal.h"
46 #include "dbus-marshal-basic.h"
48 #ifdef DBUS_DISABLE_CHECKS
49 #define TOOK_LOCK_CHECK(connection)
50 #define RELEASING_LOCK_CHECK(connection)
51 #define HAVE_LOCK_CHECK(connection)
53 #define TOOK_LOCK_CHECK(connection) do { \
54 _dbus_assert (!(connection)->have_connection_lock); \
55 (connection)->have_connection_lock = TRUE; \
57 #define RELEASING_LOCK_CHECK(connection) do { \
58 _dbus_assert ((connection)->have_connection_lock); \
59 (connection)->have_connection_lock = FALSE; \
61 #define HAVE_LOCK_CHECK(connection) _dbus_assert ((connection)->have_connection_lock)
62 /* A "DO_NOT_HAVE_LOCK_CHECK" is impossible since we need the lock to check the flag */
67 #define CONNECTION_LOCK(connection) do { \
68 if (TRACE_LOCKS) { _dbus_verbose ("LOCK\n"); } \
69 _dbus_mutex_lock ((connection)->mutex); \
70 TOOK_LOCK_CHECK (connection); \
73 #define CONNECTION_UNLOCK(connection) _dbus_connection_unlock (connection)
75 #define SLOTS_LOCK(connection) do { \
76 _dbus_mutex_lock ((connection)->slot_mutex); \
79 #define SLOTS_UNLOCK(connection) do { \
80 _dbus_mutex_unlock ((connection)->slot_mutex); \
83 #define DISPATCH_STATUS_NAME(s) \
84 ((s) == DBUS_DISPATCH_COMPLETE ? "complete" : \
85 (s) == DBUS_DISPATCH_DATA_REMAINS ? "data remains" : \
86 (s) == DBUS_DISPATCH_NEED_MEMORY ? "need memory" : \
90 * @defgroup DBusConnection DBusConnection
92 * @brief Connection to another application
94 * A DBusConnection represents a connection to another
95 * application. Messages can be sent and received via this connection.
96 * The other application may be a message bus; for convenience, the
97 * function dbus_bus_get() is provided to automatically open a
98 * connection to the well-known message buses.
100 * In brief a DBusConnection is a message queue associated with some
101 * message transport mechanism such as a socket. The connection
102 * maintains a queue of incoming messages and a queue of outgoing
105 * Several functions use the following terms:
107 * <li><b>read</b> means to fill the incoming message queue by reading from the socket</li>
108 * <li><b>write</b> means to drain the outgoing queue by writing to the socket</li>
109 * <li><b>dispatch</b> means to drain the incoming queue by invoking application-provided message handlers</li>
112 * The function dbus_connection_read_write_dispatch() for example does all
113 * three of these things, offering a simple alternative to a main loop.
115 * In an application with a main loop, the read/write/dispatch
116 * operations are usually separate.
118 * The connection provides #DBusWatch and #DBusTimeout objects to
119 * the main loop. These are used to know when reading, writing, or
120 * dispatching should be performed.
122 * Incoming messages are processed
123 * by calling dbus_connection_dispatch(). dbus_connection_dispatch()
124 * runs any handlers registered for the topmost message in the message
125 * queue, then discards the message, then returns.
127 * dbus_connection_get_dispatch_status() indicates whether
128 * messages are currently in the queue that need dispatching.
129 * dbus_connection_set_dispatch_status_function() allows
130 * you to set a function to be used to monitor the dispatch status.
132 * If you're using GLib or Qt add-on libraries for D-Bus, there are
133 * special convenience APIs in those libraries that hide
134 * all the details of dispatch and watch/timeout monitoring.
135 * For example, dbus_connection_setup_with_g_main().
137 * If you aren't using these add-on libraries, but want to process
138 * messages asynchronously, you must manually call
139 * dbus_connection_set_dispatch_status_function(),
140 * dbus_connection_set_watch_functions(),
141 * dbus_connection_set_timeout_functions() providing appropriate
142 * functions to integrate the connection with your application's main
143 * loop. This can be tricky to get right; main loops are not simple.
145 * If you don't need to be asynchronous, you can ignore #DBusWatch,
146 * #DBusTimeout, and dbus_connection_dispatch(). Instead,
147 * dbus_connection_read_write_dispatch() can be used.
149 * Or, in <em>very</em> simple applications,
150 * dbus_connection_pop_message() may be all you need, allowing you to
151 * avoid setting up any handler functions (see
152 * dbus_connection_add_filter(),
153 * dbus_connection_register_object_path() for more on handlers).
155 * When you use dbus_connection_send() or one of its variants to send
156 * a message, the message is added to the outgoing queue. It's
157 * actually written to the network later; either in
158 * dbus_watch_handle() invoked by your main loop, or in
159 * dbus_connection_flush() which blocks until it can write out the
160 * entire outgoing queue. The GLib/Qt add-on libraries again
161 * handle the details here for you by setting up watch functions.
163 * When a connection is disconnected, you are guaranteed to get a
164 * signal "Disconnected" from the interface
165 * #DBUS_INTERFACE_LOCAL, path
168 * You may not drop the last reference to a #DBusConnection
169 * until that connection has been disconnected.
171 * You may dispatch the unprocessed incoming message queue even if the
172 * connection is disconnected. However, "Disconnected" will always be
173 * the last message in the queue (obviously no messages are received
174 * after disconnection).
176 * After calling dbus_threads_init(), #DBusConnection has thread
177 * locks and drops them when invoking user callbacks, so in general is
178 * transparently threadsafe. However, #DBusMessage does NOT have
179 * thread locks; you must not send the same message to multiple
180 * #DBusConnection if those connections will be used from different threads,
183 * Also, if you dispatch or pop messages from multiple threads, it
184 * may work in the sense that it won't crash, but it's tough to imagine
185 * sane results; it will be completely unpredictable which messages
186 * go to which threads.
188 * It's recommended to dispatch from a single thread.
190 * The most useful function to call from multiple threads at once
191 * is dbus_connection_send_with_reply_and_block(). That is,
192 * multiple threads can make method calls at the same time.
194 * If you aren't using threads, you can use a main loop and
195 * dbus_pending_call_set_notify() to achieve a similar result.
199 * @defgroup DBusConnectionInternals DBusConnection implementation details
200 * @ingroup DBusInternals
201 * @brief Implementation details of DBusConnection
207 * Internal struct representing a message filter function
209 typedef struct DBusMessageFilter DBusMessageFilter;
212 * Internal struct representing a message filter function
214 struct DBusMessageFilter
216 DBusAtomic refcount; /**< Reference count */
217 DBusHandleMessageFunction function; /**< Function to call to filter */
218 void *user_data; /**< User data for the function */
219 DBusFreeFunction free_user_data_function; /**< Function to free the user data */
224 * Internals of DBusPreallocatedSend
226 struct DBusPreallocatedSend
228 DBusConnection *connection; /**< Connection we'd send the message to */
229 DBusList *queue_link; /**< Preallocated link in the queue */
230 DBusList *counter_link; /**< Preallocated link in the resource counter */
233 #if HAVE_DECL_MSG_NOSIGNAL
234 static dbus_bool_t _dbus_modify_sigpipe = FALSE;
236 static dbus_bool_t _dbus_modify_sigpipe = TRUE;
240 * Implementation details of DBusConnection. All fields are private.
242 struct DBusConnection
244 DBusAtomic refcount; /**< Reference count. */
246 DBusMutex *mutex; /**< Lock on the entire DBusConnection */
248 DBusMutex *dispatch_mutex; /**< Protects dispatch_acquired */
249 DBusCondVar *dispatch_cond; /**< Notify when dispatch_acquired is available */
250 DBusMutex *io_path_mutex; /**< Protects io_path_acquired */
251 DBusCondVar *io_path_cond; /**< Notify when io_path_acquired is available */
253 DBusList *outgoing_messages; /**< Queue of messages we need to send, send the end of the list first. */
254 DBusList *incoming_messages; /**< Queue of messages we have received, end of the list received most recently. */
255 DBusList *expired_messages; /**< Messages that will be released when we next unlock. */
257 DBusMessage *message_borrowed; /**< Filled in if the first incoming message has been borrowed;
258 * dispatch_acquired will be set by the borrower
261 int n_outgoing; /**< Length of outgoing queue. */
262 int n_incoming; /**< Length of incoming queue. */
264 DBusCounter *outgoing_counter; /**< Counts size of outgoing messages. */
266 DBusTransport *transport; /**< Object that sends/receives messages over network. */
267 DBusWatchList *watches; /**< Stores active watches. */
268 DBusTimeoutList *timeouts; /**< Stores active timeouts. */
270 DBusList *filter_list; /**< List of filters. */
272 DBusMutex *slot_mutex; /**< Lock on slot_list so overall connection lock need not be taken */
273 DBusDataSlotList slot_list; /**< Data stored by allocated integer ID */
275 DBusHashTable *pending_replies; /**< Hash of message serials to #DBusPendingCall. */
277 dbus_uint32_t client_serial; /**< Client serial. Increments each time a message is sent */
278 DBusList *disconnect_message_link; /**< Preallocated list node for queueing the disconnection message */
280 DBusWakeupMainFunction wakeup_main_function; /**< Function to wake up the mainloop */
281 void *wakeup_main_data; /**< Application data for wakeup_main_function */
282 DBusFreeFunction free_wakeup_main_data; /**< free wakeup_main_data */
284 DBusDispatchStatusFunction dispatch_status_function; /**< Function on dispatch status changes */
285 void *dispatch_status_data; /**< Application data for dispatch_status_function */
286 DBusFreeFunction free_dispatch_status_data; /**< free dispatch_status_data */
288 DBusDispatchStatus last_dispatch_status; /**< The last dispatch status we reported to the application. */
290 DBusObjectTree *objects; /**< Object path handlers registered with this connection */
292 char *server_guid; /**< GUID of server if we are in shared_connections, #NULL if server GUID is unknown or connection is private */
294 /* These two MUST be bools and not bitfields, because they are protected by a separate lock
295 * from connection->mutex and all bitfields in a word have to be read/written together.
296 * So you can't have a different lock for different bitfields in the same word.
298 dbus_bool_t dispatch_acquired; /**< Someone has dispatch path (can drain incoming queue) */
299 dbus_bool_t io_path_acquired; /**< Someone has transport io path (can use the transport to read/write messages) */
301 unsigned int shareable : 1; /**< #TRUE if libdbus owns a reference to the connection and can return it from dbus_connection_open() more than once */
303 unsigned int exit_on_disconnect : 1; /**< If #TRUE, exit after handling disconnect signal */
305 unsigned int route_peer_messages : 1; /**< If #TRUE, if org.freedesktop.DBus.Peer messages have a bus name, don't handle them automatically */
307 unsigned int disconnected_message_arrived : 1; /**< We popped or are dispatching the disconnected message.
308 * if the disconnect_message_link is NULL then we queued it, but
309 * this flag is whether it got to the head of the queue.
311 unsigned int disconnected_message_processed : 1; /**< We did our default handling of the disconnected message,
312 * such as closing the connection.
315 #ifndef DBUS_DISABLE_CHECKS
316 unsigned int have_connection_lock : 1; /**< Used to check locking */
319 #ifndef DBUS_DISABLE_CHECKS
320 int generation; /**< _dbus_current_generation that should correspond to this connection */
324 static DBusDispatchStatus _dbus_connection_get_dispatch_status_unlocked (DBusConnection *connection);
325 static void _dbus_connection_update_dispatch_status_and_unlock (DBusConnection *connection,
326 DBusDispatchStatus new_status);
327 static void _dbus_connection_last_unref (DBusConnection *connection);
328 static void _dbus_connection_acquire_dispatch (DBusConnection *connection);
329 static void _dbus_connection_release_dispatch (DBusConnection *connection);
330 static DBusDispatchStatus _dbus_connection_flush_unlocked (DBusConnection *connection);
331 static void _dbus_connection_close_possibly_shared_and_unlock (DBusConnection *connection);
332 static dbus_bool_t _dbus_connection_get_is_connected_unlocked (DBusConnection *connection);
333 static dbus_bool_t _dbus_connection_peek_for_reply_unlocked (DBusConnection *connection,
334 dbus_uint32_t client_serial);
336 static DBusMessageFilter *
337 _dbus_message_filter_ref (DBusMessageFilter *filter)
339 #ifdef DBUS_DISABLE_ASSERT
340 _dbus_atomic_inc (&filter->refcount);
342 dbus_int32_t old_value;
344 old_value = _dbus_atomic_inc (&filter->refcount);
345 _dbus_assert (old_value > 0);
352 _dbus_message_filter_unref (DBusMessageFilter *filter)
354 dbus_int32_t old_value;
356 old_value = _dbus_atomic_dec (&filter->refcount);
357 _dbus_assert (old_value > 0);
361 if (filter->free_user_data_function)
362 (* filter->free_user_data_function) (filter->user_data);
369 * Acquires the connection lock.
371 * @param connection the connection.
374 _dbus_connection_lock (DBusConnection *connection)
376 CONNECTION_LOCK (connection);
380 * Releases the connection lock.
382 * @param connection the connection.
385 _dbus_connection_unlock (DBusConnection *connection)
387 DBusList *expired_messages;
392 _dbus_verbose ("UNLOCK\n");
395 /* If we had messages that expired (fell off the incoming or outgoing
396 * queues) while we were locked, actually release them now */
397 expired_messages = connection->expired_messages;
398 connection->expired_messages = NULL;
400 RELEASING_LOCK_CHECK (connection);
401 _dbus_mutex_unlock (connection->mutex);
403 for (iter = _dbus_list_pop_first_link (&expired_messages);
405 iter = _dbus_list_pop_first_link (&expired_messages))
407 DBusMessage *message = iter->data;
409 dbus_message_unref (message);
410 _dbus_list_free_link (iter);
415 * Wakes up the main loop if it is sleeping
416 * Needed if we're e.g. queueing outgoing messages
417 * on a thread while the mainloop sleeps.
419 * @param connection the connection.
422 _dbus_connection_wakeup_mainloop (DBusConnection *connection)
424 if (connection->wakeup_main_function)
425 (*connection->wakeup_main_function) (connection->wakeup_main_data);
428 #ifdef DBUS_BUILD_TESTS
429 /* For now this function isn't used */
431 * Adds a message to the incoming message queue, returning #FALSE
432 * if there's insufficient memory to queue the message.
433 * Does not take over refcount of the message.
435 * @param connection the connection.
436 * @param message the message to queue.
437 * @returns #TRUE on success.
440 _dbus_connection_queue_received_message (DBusConnection *connection,
441 DBusMessage *message)
445 link = _dbus_list_alloc_link (message);
449 dbus_message_ref (message);
450 _dbus_connection_queue_received_message_link (connection, link);
456 * Gets the locks so we can examine them
458 * @param connection the connection.
459 * @param mutex_loc return for the location of the main mutex pointer
460 * @param dispatch_mutex_loc return location of the dispatch mutex pointer
461 * @param io_path_mutex_loc return location of the io_path mutex pointer
462 * @param dispatch_cond_loc return location of the dispatch conditional
464 * @param io_path_cond_loc return location of the io_path conditional
468 _dbus_connection_test_get_locks (DBusConnection *connection,
469 DBusMutex **mutex_loc,
470 DBusMutex **dispatch_mutex_loc,
471 DBusMutex **io_path_mutex_loc,
472 DBusCondVar **dispatch_cond_loc,
473 DBusCondVar **io_path_cond_loc)
475 *mutex_loc = connection->mutex;
476 *dispatch_mutex_loc = connection->dispatch_mutex;
477 *io_path_mutex_loc = connection->io_path_mutex;
478 *dispatch_cond_loc = connection->dispatch_cond;
479 *io_path_cond_loc = connection->io_path_cond;
484 * Adds a message-containing list link to the incoming message queue,
485 * taking ownership of the link and the message's current refcount.
486 * Cannot fail due to lack of memory.
488 * @param connection the connection.
489 * @param link the message link to queue.
492 _dbus_connection_queue_received_message_link (DBusConnection *connection,
495 DBusPendingCall *pending;
496 dbus_uint32_t reply_serial;
497 DBusMessage *message;
499 _dbus_assert (_dbus_transport_get_is_authenticated (connection->transport));
501 _dbus_list_append_link (&connection->incoming_messages,
503 message = link->data;
505 /* If this is a reply we're waiting on, remove timeout for it */
506 reply_serial = dbus_message_get_reply_serial (message);
507 if (reply_serial != 0)
509 pending = _dbus_hash_table_lookup_int (connection->pending_replies,
513 if (_dbus_pending_call_is_timeout_added_unlocked (pending))
514 _dbus_connection_remove_timeout_unlocked (connection,
515 _dbus_pending_call_get_timeout_unlocked (pending));
517 _dbus_pending_call_set_timeout_added_unlocked (pending, FALSE);
523 connection->n_incoming += 1;
525 _dbus_connection_wakeup_mainloop (connection);
527 _dbus_verbose ("Message %p (%s %s %s %s '%s' reply to %u) added to incoming queue %p, %d incoming\n",
529 dbus_message_type_to_string (dbus_message_get_type (message)),
530 dbus_message_get_path (message) ?
531 dbus_message_get_path (message) :
533 dbus_message_get_interface (message) ?
534 dbus_message_get_interface (message) :
536 dbus_message_get_member (message) ?
537 dbus_message_get_member (message) :
539 dbus_message_get_signature (message),
540 dbus_message_get_reply_serial (message),
542 connection->n_incoming);}
545 * Adds a link + message to the incoming message queue.
546 * Can't fail. Takes ownership of both link and message.
548 * @param connection the connection.
549 * @param link the list node and message to queue.
553 _dbus_connection_queue_synthesized_message_link (DBusConnection *connection,
556 HAVE_LOCK_CHECK (connection);
558 _dbus_list_append_link (&connection->incoming_messages, link);
560 connection->n_incoming += 1;
562 _dbus_connection_wakeup_mainloop (connection);
564 _dbus_verbose ("Synthesized message %p added to incoming queue %p, %d incoming\n",
565 link->data, connection, connection->n_incoming);
570 * Checks whether there are messages in the outgoing message queue.
571 * Called with connection lock held.
573 * @param connection the connection.
574 * @returns #TRUE if the outgoing queue is non-empty.
577 _dbus_connection_has_messages_to_send_unlocked (DBusConnection *connection)
579 HAVE_LOCK_CHECK (connection);
580 return connection->outgoing_messages != NULL;
584 * Checks whether there are messages in the outgoing message queue.
585 * Use dbus_connection_flush() to block until all outgoing
586 * messages have been written to the underlying transport
587 * (such as a socket).
589 * @param connection the connection.
590 * @returns #TRUE if the outgoing queue is non-empty.
593 dbus_connection_has_messages_to_send (DBusConnection *connection)
597 _dbus_return_val_if_fail (connection != NULL, FALSE);
599 CONNECTION_LOCK (connection);
600 v = _dbus_connection_has_messages_to_send_unlocked (connection);
601 CONNECTION_UNLOCK (connection);
607 * Gets the next outgoing message. The message remains in the
608 * queue, and the caller does not own a reference to it.
610 * @param connection the connection.
611 * @returns the message to be sent.
614 _dbus_connection_get_message_to_send (DBusConnection *connection)
616 HAVE_LOCK_CHECK (connection);
618 return _dbus_list_get_last (&connection->outgoing_messages);
622 * Notifies the connection that a message has been sent, so the
623 * message can be removed from the outgoing queue.
624 * Called with the connection lock held.
626 * @param connection the connection.
627 * @param message the message that was sent.
630 _dbus_connection_message_sent_unlocked (DBusConnection *connection,
631 DBusMessage *message)
635 HAVE_LOCK_CHECK (connection);
637 /* This can be called before we even complete authentication, since
638 * it's called on disconnect to clean up the outgoing queue.
639 * It's also called as we successfully send each message.
642 link = _dbus_list_get_last_link (&connection->outgoing_messages);
643 _dbus_assert (link != NULL);
644 _dbus_assert (link->data == message);
646 _dbus_list_unlink (&connection->outgoing_messages,
648 _dbus_list_prepend_link (&connection->expired_messages, link);
650 connection->n_outgoing -= 1;
652 _dbus_verbose ("Message %p (%s %s %s %s '%s') removed from outgoing queue %p, %d left to send\n",
654 dbus_message_type_to_string (dbus_message_get_type (message)),
655 dbus_message_get_path (message) ?
656 dbus_message_get_path (message) :
658 dbus_message_get_interface (message) ?
659 dbus_message_get_interface (message) :
661 dbus_message_get_member (message) ?
662 dbus_message_get_member (message) :
664 dbus_message_get_signature (message),
665 connection, connection->n_outgoing);
667 /* It's OK that in principle we call the notify function, because for the
668 * outgoing limit, there isn't one */
669 _dbus_message_remove_counter (message, connection->outgoing_counter, NULL);
671 /* The message will actually be unreffed when we unlock */
674 /** Function to be called in protected_change_watch() with refcount held */
675 typedef dbus_bool_t (* DBusWatchAddFunction) (DBusWatchList *list,
677 /** Function to be called in protected_change_watch() with refcount held */
678 typedef void (* DBusWatchRemoveFunction) (DBusWatchList *list,
680 /** Function to be called in protected_change_watch() with refcount held */
681 typedef void (* DBusWatchToggleFunction) (DBusWatchList *list,
683 dbus_bool_t enabled);
686 protected_change_watch (DBusConnection *connection,
688 DBusWatchAddFunction add_function,
689 DBusWatchRemoveFunction remove_function,
690 DBusWatchToggleFunction toggle_function,
695 HAVE_LOCK_CHECK (connection);
697 /* The original purpose of protected_change_watch() was to hold a
698 * ref on the connection while dropping the connection lock, then
699 * calling out to the app. This was a broken hack that did not
700 * work, since the connection was in a hosed state (no WatchList
701 * field) while calling out.
703 * So for now we'll just keep the lock while calling out. This means
704 * apps are not allowed to call DBusConnection methods inside a
705 * watch function or they will deadlock.
707 * The "real fix" is to use the _and_unlock() pattern found
708 * elsewhere in the code, to defer calling out to the app until
709 * we're about to drop locks and return flow of control to the app
712 * See http://lists.freedesktop.org/archives/dbus/2007-July/thread.html#8144
715 if (connection->watches)
718 retval = (* add_function) (connection->watches, watch);
719 else if (remove_function)
722 (* remove_function) (connection->watches, watch);
727 (* toggle_function) (connection->watches, watch, enabled);
737 * Adds a watch using the connection's DBusAddWatchFunction if
738 * available. Otherwise records the watch to be added when said
739 * function is available. Also re-adds the watch if the
740 * DBusAddWatchFunction changes. May fail due to lack of memory.
741 * Connection lock should be held when calling this.
743 * @param connection the connection.
744 * @param watch the watch to add.
745 * @returns #TRUE on success.
748 _dbus_connection_add_watch_unlocked (DBusConnection *connection,
751 return protected_change_watch (connection, watch,
752 _dbus_watch_list_add_watch,
757 * Removes a watch using the connection's DBusRemoveWatchFunction
758 * if available. It's an error to call this function on a watch
759 * that was not previously added.
760 * Connection lock should be held when calling this.
762 * @param connection the connection.
763 * @param watch the watch to remove.
766 _dbus_connection_remove_watch_unlocked (DBusConnection *connection,
769 protected_change_watch (connection, watch,
771 _dbus_watch_list_remove_watch,
776 * Toggles a watch and notifies app via connection's
777 * DBusWatchToggledFunction if available. It's an error to call this
778 * function on a watch that was not previously added.
779 * Connection lock should be held when calling this.
781 * @param connection the connection.
782 * @param watch the watch to toggle.
783 * @param enabled whether to enable or disable
786 _dbus_connection_toggle_watch_unlocked (DBusConnection *connection,
790 _dbus_assert (watch != NULL);
792 protected_change_watch (connection, watch,
794 _dbus_watch_list_toggle_watch,
798 /** Function to be called in protected_change_timeout() with refcount held */
799 typedef dbus_bool_t (* DBusTimeoutAddFunction) (DBusTimeoutList *list,
800 DBusTimeout *timeout);
801 /** Function to be called in protected_change_timeout() with refcount held */
802 typedef void (* DBusTimeoutRemoveFunction) (DBusTimeoutList *list,
803 DBusTimeout *timeout);
804 /** Function to be called in protected_change_timeout() with refcount held */
805 typedef void (* DBusTimeoutToggleFunction) (DBusTimeoutList *list,
806 DBusTimeout *timeout,
807 dbus_bool_t enabled);
810 protected_change_timeout (DBusConnection *connection,
811 DBusTimeout *timeout,
812 DBusTimeoutAddFunction add_function,
813 DBusTimeoutRemoveFunction remove_function,
814 DBusTimeoutToggleFunction toggle_function,
819 HAVE_LOCK_CHECK (connection);
821 /* The original purpose of protected_change_timeout() was to hold a
822 * ref on the connection while dropping the connection lock, then
823 * calling out to the app. This was a broken hack that did not
824 * work, since the connection was in a hosed state (no TimeoutList
825 * field) while calling out.
827 * So for now we'll just keep the lock while calling out. This means
828 * apps are not allowed to call DBusConnection methods inside a
829 * timeout function or they will deadlock.
831 * The "real fix" is to use the _and_unlock() pattern found
832 * elsewhere in the code, to defer calling out to the app until
833 * we're about to drop locks and return flow of control to the app
836 * See http://lists.freedesktop.org/archives/dbus/2007-July/thread.html#8144
839 if (connection->timeouts)
842 retval = (* add_function) (connection->timeouts, timeout);
843 else if (remove_function)
846 (* remove_function) (connection->timeouts, timeout);
851 (* toggle_function) (connection->timeouts, timeout, enabled);
860 * Adds a timeout using the connection's DBusAddTimeoutFunction if
861 * available. Otherwise records the timeout to be added when said
862 * function is available. Also re-adds the timeout if the
863 * DBusAddTimeoutFunction changes. May fail due to lack of memory.
864 * The timeout will fire repeatedly until removed.
865 * Connection lock should be held when calling this.
867 * @param connection the connection.
868 * @param timeout the timeout to add.
869 * @returns #TRUE on success.
872 _dbus_connection_add_timeout_unlocked (DBusConnection *connection,
873 DBusTimeout *timeout)
875 return protected_change_timeout (connection, timeout,
876 _dbus_timeout_list_add_timeout,
881 * Removes a timeout using the connection's DBusRemoveTimeoutFunction
882 * if available. It's an error to call this function on a timeout
883 * that was not previously added.
884 * Connection lock should be held when calling this.
886 * @param connection the connection.
887 * @param timeout the timeout to remove.
890 _dbus_connection_remove_timeout_unlocked (DBusConnection *connection,
891 DBusTimeout *timeout)
893 protected_change_timeout (connection, timeout,
895 _dbus_timeout_list_remove_timeout,
900 * Toggles a timeout and notifies app via connection's
901 * DBusTimeoutToggledFunction if available. It's an error to call this
902 * function on a timeout that was not previously added.
903 * Connection lock should be held when calling this.
905 * @param connection the connection.
906 * @param timeout the timeout to toggle.
907 * @param enabled whether to enable or disable
910 _dbus_connection_toggle_timeout_unlocked (DBusConnection *connection,
911 DBusTimeout *timeout,
914 protected_change_timeout (connection, timeout,
916 _dbus_timeout_list_toggle_timeout,
921 _dbus_connection_attach_pending_call_unlocked (DBusConnection *connection,
922 DBusPendingCall *pending)
924 dbus_uint32_t reply_serial;
925 DBusTimeout *timeout;
927 HAVE_LOCK_CHECK (connection);
929 reply_serial = _dbus_pending_call_get_reply_serial_unlocked (pending);
931 _dbus_assert (reply_serial != 0);
933 timeout = _dbus_pending_call_get_timeout_unlocked (pending);
937 if (!_dbus_connection_add_timeout_unlocked (connection, timeout))
940 if (!_dbus_hash_table_insert_int (connection->pending_replies,
944 _dbus_connection_remove_timeout_unlocked (connection, timeout);
946 _dbus_pending_call_set_timeout_added_unlocked (pending, FALSE);
947 HAVE_LOCK_CHECK (connection);
951 _dbus_pending_call_set_timeout_added_unlocked (pending, TRUE);
955 if (!_dbus_hash_table_insert_int (connection->pending_replies,
959 HAVE_LOCK_CHECK (connection);
964 _dbus_pending_call_ref_unlocked (pending);
966 HAVE_LOCK_CHECK (connection);
972 free_pending_call_on_hash_removal (void *data)
974 DBusPendingCall *pending;
975 DBusConnection *connection;
982 connection = _dbus_pending_call_get_connection_unlocked (pending);
984 HAVE_LOCK_CHECK (connection);
986 if (_dbus_pending_call_is_timeout_added_unlocked (pending))
988 _dbus_connection_remove_timeout_unlocked (connection,
989 _dbus_pending_call_get_timeout_unlocked (pending));
991 _dbus_pending_call_set_timeout_added_unlocked (pending, FALSE);
994 /* FIXME 1.0? this is sort of dangerous and undesirable to drop the lock
995 * here, but the pending call finalizer could in principle call out to
996 * application code so we pretty much have to... some larger code reorg
999 _dbus_connection_ref_unlocked (connection);
1000 _dbus_pending_call_unref_and_unlock (pending);
1001 CONNECTION_LOCK (connection);
1002 _dbus_connection_unref_unlocked (connection);
1006 _dbus_connection_detach_pending_call_unlocked (DBusConnection *connection,
1007 DBusPendingCall *pending)
1009 /* This ends up unlocking to call the pending call finalizer, which is unexpected to
1012 _dbus_hash_table_remove_int (connection->pending_replies,
1013 _dbus_pending_call_get_reply_serial_unlocked (pending));
1017 _dbus_connection_detach_pending_call_and_unlock (DBusConnection *connection,
1018 DBusPendingCall *pending)
1020 /* The idea here is to avoid finalizing the pending call
1021 * with the lock held, since there's a destroy notifier
1022 * in pending call that goes out to application code.
1024 * There's an extra unlock inside the hash table
1025 * "free pending call" function FIXME...
1027 _dbus_pending_call_ref_unlocked (pending);
1028 _dbus_hash_table_remove_int (connection->pending_replies,
1029 _dbus_pending_call_get_reply_serial_unlocked (pending));
1031 if (_dbus_pending_call_is_timeout_added_unlocked (pending))
1032 _dbus_connection_remove_timeout_unlocked (connection,
1033 _dbus_pending_call_get_timeout_unlocked (pending));
1035 _dbus_pending_call_set_timeout_added_unlocked (pending, FALSE);
1037 _dbus_pending_call_unref_and_unlock (pending);
1041 * Removes a pending call from the connection, such that
1042 * the pending reply will be ignored. May drop the last
1043 * reference to the pending call.
1045 * @param connection the connection
1046 * @param pending the pending call
1049 _dbus_connection_remove_pending_call (DBusConnection *connection,
1050 DBusPendingCall *pending)
1052 CONNECTION_LOCK (connection);
1053 _dbus_connection_detach_pending_call_and_unlock (connection, pending);
1057 * Acquire the transporter I/O path. This must be done before
1058 * doing any I/O in the transporter. May sleep and drop the
1059 * IO path mutex while waiting for the I/O path.
1061 * @param connection the connection.
1062 * @param timeout_milliseconds maximum blocking time, or -1 for no limit.
1063 * @returns TRUE if the I/O path was acquired.
1066 _dbus_connection_acquire_io_path (DBusConnection *connection,
1067 int timeout_milliseconds)
1069 dbus_bool_t we_acquired;
1071 HAVE_LOCK_CHECK (connection);
1073 /* We don't want the connection to vanish */
1074 _dbus_connection_ref_unlocked (connection);
1076 /* We will only touch io_path_acquired which is protected by our mutex */
1077 CONNECTION_UNLOCK (connection);
1079 _dbus_verbose ("locking io_path_mutex\n");
1080 _dbus_mutex_lock (connection->io_path_mutex);
1082 _dbus_verbose ("start connection->io_path_acquired = %d timeout = %d\n",
1083 connection->io_path_acquired, timeout_milliseconds);
1085 we_acquired = FALSE;
1087 if (connection->io_path_acquired)
1089 if (timeout_milliseconds != -1)
1091 _dbus_verbose ("waiting %d for IO path to be acquirable\n",
1092 timeout_milliseconds);
1094 if (!_dbus_condvar_wait_timeout (connection->io_path_cond,
1095 connection->io_path_mutex,
1096 timeout_milliseconds))
1098 /* We timed out before anyone signaled. */
1099 /* (writing the loop to handle the !timedout case by
1100 * waiting longer if needed is a pain since dbus
1101 * wraps pthread_cond_timedwait to take a relative
1102 * time instead of absolute, something kind of stupid
1103 * on our part. for now it doesn't matter, we will just
1104 * end up back here eventually.)
1110 while (connection->io_path_acquired)
1112 _dbus_verbose ("waiting for IO path to be acquirable\n");
1113 _dbus_condvar_wait (connection->io_path_cond,
1114 connection->io_path_mutex);
1119 if (!connection->io_path_acquired)
1122 connection->io_path_acquired = TRUE;
1125 _dbus_verbose ("end connection->io_path_acquired = %d we_acquired = %d\n",
1126 connection->io_path_acquired, we_acquired);
1128 _dbus_verbose ("unlocking io_path_mutex\n");
1129 _dbus_mutex_unlock (connection->io_path_mutex);
1131 CONNECTION_LOCK (connection);
1133 HAVE_LOCK_CHECK (connection);
1135 _dbus_connection_unref_unlocked (connection);
1141 * Release the I/O path when you're done with it. Only call
1142 * after you've acquired the I/O. Wakes up at most one thread
1143 * currently waiting to acquire the I/O path.
1145 * @param connection the connection.
1148 _dbus_connection_release_io_path (DBusConnection *connection)
1150 HAVE_LOCK_CHECK (connection);
1152 _dbus_verbose ("locking io_path_mutex\n");
1153 _dbus_mutex_lock (connection->io_path_mutex);
1155 _dbus_assert (connection->io_path_acquired);
1157 _dbus_verbose ("start connection->io_path_acquired = %d\n",
1158 connection->io_path_acquired);
1160 connection->io_path_acquired = FALSE;
1161 _dbus_condvar_wake_one (connection->io_path_cond);
1163 _dbus_verbose ("unlocking io_path_mutex\n");
1164 _dbus_mutex_unlock (connection->io_path_mutex);
1168 * Queues incoming messages and sends outgoing messages for this
1169 * connection, optionally blocking in the process. Each call to
1170 * _dbus_connection_do_iteration_unlocked() will call select() or poll() one
1171 * time and then read or write data if possible.
1173 * The purpose of this function is to be able to flush outgoing
1174 * messages or queue up incoming messages without returning
1175 * control to the application and causing reentrancy weirdness.
1177 * The flags parameter allows you to specify whether to
1178 * read incoming messages, write outgoing messages, or both,
1179 * and whether to block if no immediate action is possible.
1181 * The timeout_milliseconds parameter does nothing unless the
1182 * iteration is blocking.
1184 * If there are no outgoing messages and DBUS_ITERATION_DO_READING
1185 * wasn't specified, then it's impossible to block, even if
1186 * you specify DBUS_ITERATION_BLOCK; in that case the function
1187 * returns immediately.
1189 * If pending is not NULL then a check is made if the pending call
1190 * is completed after the io path has been required. If the call
1191 * has been completed nothing is done. This must be done since
1192 * the _dbus_connection_acquire_io_path releases the connection
1195 * Called with connection lock held.
1197 * @param connection the connection.
1198 * @param pending the pending call that should be checked or NULL
1199 * @param flags iteration flags.
1200 * @param timeout_milliseconds maximum blocking time, or -1 for no limit.
1203 _dbus_connection_do_iteration_unlocked (DBusConnection *connection,
1204 DBusPendingCall *pending,
1206 int timeout_milliseconds)
1208 _dbus_verbose ("start\n");
1210 HAVE_LOCK_CHECK (connection);
1212 if (connection->n_outgoing == 0)
1213 flags &= ~DBUS_ITERATION_DO_WRITING;
1215 if (_dbus_connection_acquire_io_path (connection,
1216 (flags & DBUS_ITERATION_BLOCK) ? timeout_milliseconds : 0))
1218 HAVE_LOCK_CHECK (connection);
1220 if ( (pending != NULL) && _dbus_pending_call_get_completed_unlocked(pending))
1222 _dbus_verbose ("pending call completed while acquiring I/O path");
1224 else if ( (pending != NULL) &&
1225 _dbus_connection_peek_for_reply_unlocked (connection,
1226 _dbus_pending_call_get_reply_serial_unlocked (pending)))
1228 _dbus_verbose ("pending call completed while acquiring I/O path (reply found in queue)");
1232 _dbus_transport_do_iteration (connection->transport,
1233 flags, timeout_milliseconds);
1236 _dbus_connection_release_io_path (connection);
1239 HAVE_LOCK_CHECK (connection);
1241 _dbus_verbose ("end\n");
1245 * Creates a new connection for the given transport. A transport
1246 * represents a message stream that uses some concrete mechanism, such
1247 * as UNIX domain sockets. May return #NULL if insufficient
1248 * memory exists to create the connection.
1250 * @param transport the transport.
1251 * @returns the new connection, or #NULL on failure.
1254 _dbus_connection_new_for_transport (DBusTransport *transport)
1256 DBusConnection *connection;
1257 DBusWatchList *watch_list;
1258 DBusTimeoutList *timeout_list;
1259 DBusHashTable *pending_replies;
1260 DBusList *disconnect_link;
1261 DBusMessage *disconnect_message;
1262 DBusCounter *outgoing_counter;
1263 DBusObjectTree *objects;
1267 pending_replies = NULL;
1268 timeout_list = NULL;
1269 disconnect_link = NULL;
1270 disconnect_message = NULL;
1271 outgoing_counter = NULL;
1274 watch_list = _dbus_watch_list_new ();
1275 if (watch_list == NULL)
1278 timeout_list = _dbus_timeout_list_new ();
1279 if (timeout_list == NULL)
1283 _dbus_hash_table_new (DBUS_HASH_INT,
1285 (DBusFreeFunction)free_pending_call_on_hash_removal);
1286 if (pending_replies == NULL)
1289 connection = dbus_new0 (DBusConnection, 1);
1290 if (connection == NULL)
1293 _dbus_mutex_new_at_location (&connection->mutex);
1294 if (connection->mutex == NULL)
1297 _dbus_mutex_new_at_location (&connection->io_path_mutex);
1298 if (connection->io_path_mutex == NULL)
1301 _dbus_mutex_new_at_location (&connection->dispatch_mutex);
1302 if (connection->dispatch_mutex == NULL)
1305 _dbus_condvar_new_at_location (&connection->dispatch_cond);
1306 if (connection->dispatch_cond == NULL)
1309 _dbus_condvar_new_at_location (&connection->io_path_cond);
1310 if (connection->io_path_cond == NULL)
1313 _dbus_mutex_new_at_location (&connection->slot_mutex);
1314 if (connection->slot_mutex == NULL)
1317 disconnect_message = dbus_message_new_signal (DBUS_PATH_LOCAL,
1318 DBUS_INTERFACE_LOCAL,
1321 if (disconnect_message == NULL)
1324 disconnect_link = _dbus_list_alloc_link (disconnect_message);
1325 if (disconnect_link == NULL)
1328 outgoing_counter = _dbus_counter_new ();
1329 if (outgoing_counter == NULL)
1332 objects = _dbus_object_tree_new (connection);
1333 if (objects == NULL)
1336 if (_dbus_modify_sigpipe)
1337 _dbus_disable_sigpipe ();
1339 /* initialized to 0: use atomic op to avoid mixing atomic and non-atomic */
1340 _dbus_atomic_inc (&connection->refcount);
1341 connection->transport = transport;
1342 connection->watches = watch_list;
1343 connection->timeouts = timeout_list;
1344 connection->pending_replies = pending_replies;
1345 connection->outgoing_counter = outgoing_counter;
1346 connection->filter_list = NULL;
1347 connection->last_dispatch_status = DBUS_DISPATCH_COMPLETE; /* so we're notified first time there's data */
1348 connection->objects = objects;
1349 connection->exit_on_disconnect = FALSE;
1350 connection->shareable = FALSE;
1351 connection->route_peer_messages = FALSE;
1352 connection->disconnected_message_arrived = FALSE;
1353 connection->disconnected_message_processed = FALSE;
1355 #ifndef DBUS_DISABLE_CHECKS
1356 connection->generation = _dbus_current_generation;
1359 _dbus_data_slot_list_init (&connection->slot_list);
1361 connection->client_serial = 1;
1363 connection->disconnect_message_link = disconnect_link;
1365 CONNECTION_LOCK (connection);
1367 if (!_dbus_transport_set_connection (transport, connection))
1369 CONNECTION_UNLOCK (connection);
1374 _dbus_transport_ref (transport);
1376 CONNECTION_UNLOCK (connection);
1381 if (disconnect_message != NULL)
1382 dbus_message_unref (disconnect_message);
1384 if (disconnect_link != NULL)
1385 _dbus_list_free_link (disconnect_link);
1387 if (connection != NULL)
1389 _dbus_condvar_free_at_location (&connection->io_path_cond);
1390 _dbus_condvar_free_at_location (&connection->dispatch_cond);
1391 _dbus_mutex_free_at_location (&connection->mutex);
1392 _dbus_mutex_free_at_location (&connection->io_path_mutex);
1393 _dbus_mutex_free_at_location (&connection->dispatch_mutex);
1394 _dbus_mutex_free_at_location (&connection->slot_mutex);
1395 dbus_free (connection);
1397 if (pending_replies)
1398 _dbus_hash_table_unref (pending_replies);
1401 _dbus_watch_list_free (watch_list);
1404 _dbus_timeout_list_free (timeout_list);
1406 if (outgoing_counter)
1407 _dbus_counter_unref (outgoing_counter);
1410 _dbus_object_tree_unref (objects);
1416 * Increments the reference count of a DBusConnection.
1417 * Requires that the caller already holds the connection lock.
1419 * @param connection the connection.
1420 * @returns the connection.
1423 _dbus_connection_ref_unlocked (DBusConnection *connection)
1425 _dbus_assert (connection != NULL);
1426 _dbus_assert (connection->generation == _dbus_current_generation);
1428 HAVE_LOCK_CHECK (connection);
1430 _dbus_atomic_inc (&connection->refcount);
1436 * Decrements the reference count of a DBusConnection.
1437 * Requires that the caller already holds the connection lock.
1439 * @param connection the connection.
1442 _dbus_connection_unref_unlocked (DBusConnection *connection)
1444 dbus_bool_t last_unref;
1446 HAVE_LOCK_CHECK (connection);
1448 _dbus_assert (connection != NULL);
1450 last_unref = (_dbus_atomic_dec (&connection->refcount) == 1);
1453 _dbus_connection_last_unref (connection);
1456 static dbus_uint32_t
1457 _dbus_connection_get_next_client_serial (DBusConnection *connection)
1459 dbus_uint32_t serial;
1461 serial = connection->client_serial++;
1463 if (connection->client_serial == 0)
1464 connection->client_serial = 1;
1470 * A callback for use with dbus_watch_new() to create a DBusWatch.
1472 * @todo This is basically a hack - we could delete _dbus_transport_handle_watch()
1473 * and the virtual handle_watch in DBusTransport if we got rid of it.
1474 * The reason this is some work is threading, see the _dbus_connection_handle_watch()
1477 * @param watch the watch.
1478 * @param condition the current condition of the file descriptors being watched.
1479 * @param data must be a pointer to a #DBusConnection
1480 * @returns #FALSE if the IO condition may not have been fully handled due to lack of memory
1483 _dbus_connection_handle_watch (DBusWatch *watch,
1484 unsigned int condition,
1487 DBusConnection *connection;
1489 DBusDispatchStatus status;
1493 _dbus_verbose ("start\n");
1495 CONNECTION_LOCK (connection);
1497 if (!_dbus_connection_acquire_io_path (connection, 1))
1499 /* another thread is handling the message */
1500 CONNECTION_UNLOCK (connection);
1504 HAVE_LOCK_CHECK (connection);
1505 retval = _dbus_transport_handle_watch (connection->transport,
1508 _dbus_connection_release_io_path (connection);
1510 HAVE_LOCK_CHECK (connection);
1512 _dbus_verbose ("middle\n");
1514 status = _dbus_connection_get_dispatch_status_unlocked (connection);
1516 /* this calls out to user code */
1517 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
1519 _dbus_verbose ("end\n");
1524 _DBUS_DEFINE_GLOBAL_LOCK (shared_connections);
1525 static DBusHashTable *shared_connections = NULL;
1526 static DBusList *shared_connections_no_guid = NULL;
1529 close_connection_on_shutdown (DBusConnection *connection)
1531 DBusMessage *message;
1533 dbus_connection_ref (connection);
1534 _dbus_connection_close_possibly_shared (connection);
1536 /* Churn through to the Disconnected message */
1537 while ((message = dbus_connection_pop_message (connection)))
1539 dbus_message_unref (message);
1541 dbus_connection_unref (connection);
1545 shared_connections_shutdown (void *data)
1549 _DBUS_LOCK (shared_connections);
1551 /* This is a little bit unpleasant... better ideas? */
1552 while ((n_entries = _dbus_hash_table_get_n_entries (shared_connections)) > 0)
1554 DBusConnection *connection;
1557 _dbus_hash_iter_init (shared_connections, &iter);
1558 _dbus_hash_iter_next (&iter);
1560 connection = _dbus_hash_iter_get_value (&iter);
1562 _DBUS_UNLOCK (shared_connections);
1563 close_connection_on_shutdown (connection);
1564 _DBUS_LOCK (shared_connections);
1566 /* The connection should now be dead and not in our hash ... */
1567 _dbus_assert (_dbus_hash_table_get_n_entries (shared_connections) < n_entries);
1570 _dbus_assert (_dbus_hash_table_get_n_entries (shared_connections) == 0);
1572 _dbus_hash_table_unref (shared_connections);
1573 shared_connections = NULL;
1575 if (shared_connections_no_guid != NULL)
1577 DBusConnection *connection;
1578 connection = _dbus_list_pop_first (&shared_connections_no_guid);
1579 while (connection != NULL)
1581 _DBUS_UNLOCK (shared_connections);
1582 close_connection_on_shutdown (connection);
1583 _DBUS_LOCK (shared_connections);
1584 connection = _dbus_list_pop_first (&shared_connections_no_guid);
1588 shared_connections_no_guid = NULL;
1590 _DBUS_UNLOCK (shared_connections);
1594 connection_lookup_shared (DBusAddressEntry *entry,
1595 DBusConnection **result)
1597 _dbus_verbose ("checking for existing connection\n");
1601 _DBUS_LOCK (shared_connections);
1603 if (shared_connections == NULL)
1605 _dbus_verbose ("creating shared_connections hash table\n");
1607 shared_connections = _dbus_hash_table_new (DBUS_HASH_STRING,
1610 if (shared_connections == NULL)
1612 _DBUS_UNLOCK (shared_connections);
1616 if (!_dbus_register_shutdown_func (shared_connections_shutdown, NULL))
1618 _dbus_hash_table_unref (shared_connections);
1619 shared_connections = NULL;
1620 _DBUS_UNLOCK (shared_connections);
1624 _dbus_verbose (" successfully created shared_connections\n");
1626 _DBUS_UNLOCK (shared_connections);
1627 return TRUE; /* no point looking up in the hash we just made */
1633 guid = dbus_address_entry_get_value (entry, "guid");
1637 DBusConnection *connection;
1639 connection = _dbus_hash_table_lookup_string (shared_connections,
1644 /* The DBusConnection can't be finalized without taking
1645 * the shared_connections lock to remove it from the
1646 * hash. So it's safe to ref the connection here.
1647 * However, it may be disconnected if the Disconnected
1648 * message hasn't been processed yet, in which case we
1649 * want to pretend it isn't in the hash and avoid
1652 * The idea is to avoid ever returning a disconnected connection
1653 * from dbus_connection_open(). We could just synchronously
1654 * drop our shared ref to the connection on connection disconnect,
1655 * and then assert here that the connection is connected, but
1656 * that causes reentrancy headaches.
1658 CONNECTION_LOCK (connection);
1659 if (_dbus_connection_get_is_connected_unlocked (connection))
1661 _dbus_connection_ref_unlocked (connection);
1662 *result = connection;
1663 _dbus_verbose ("looked up existing connection to server guid %s\n",
1668 _dbus_verbose ("looked up existing connection to server guid %s but it was disconnected so ignoring it\n",
1671 CONNECTION_UNLOCK (connection);
1675 _DBUS_UNLOCK (shared_connections);
1681 connection_record_shared_unlocked (DBusConnection *connection,
1685 char *guid_in_connection;
1687 HAVE_LOCK_CHECK (connection);
1688 _dbus_assert (connection->server_guid == NULL);
1689 _dbus_assert (connection->shareable);
1691 /* get a hard ref on this connection, even if
1692 * we won't in fact store it in the hash, we still
1693 * need to hold a ref on it until it's disconnected.
1695 _dbus_connection_ref_unlocked (connection);
1699 _DBUS_LOCK (shared_connections);
1701 if (!_dbus_list_prepend (&shared_connections_no_guid, connection))
1703 _DBUS_UNLOCK (shared_connections);
1707 _DBUS_UNLOCK (shared_connections);
1708 return TRUE; /* don't store in the hash */
1711 /* A separate copy of the key is required in the hash table, because
1712 * we don't have a lock on the connection when we are doing a hash
1716 guid_key = _dbus_strdup (guid);
1717 if (guid_key == NULL)
1720 guid_in_connection = _dbus_strdup (guid);
1721 if (guid_in_connection == NULL)
1723 dbus_free (guid_key);
1727 _DBUS_LOCK (shared_connections);
1728 _dbus_assert (shared_connections != NULL);
1730 if (!_dbus_hash_table_insert_string (shared_connections,
1731 guid_key, connection))
1733 dbus_free (guid_key);
1734 dbus_free (guid_in_connection);
1735 _DBUS_UNLOCK (shared_connections);
1739 connection->server_guid = guid_in_connection;
1741 _dbus_verbose ("stored connection to %s to be shared\n",
1742 connection->server_guid);
1744 _DBUS_UNLOCK (shared_connections);
1746 _dbus_assert (connection->server_guid != NULL);
1752 connection_forget_shared_unlocked (DBusConnection *connection)
1754 HAVE_LOCK_CHECK (connection);
1756 if (!connection->shareable)
1759 _DBUS_LOCK (shared_connections);
1761 if (connection->server_guid != NULL)
1763 _dbus_verbose ("dropping connection to %s out of the shared table\n",
1764 connection->server_guid);
1766 if (!_dbus_hash_table_remove_string (shared_connections,
1767 connection->server_guid))
1768 _dbus_assert_not_reached ("connection was not in the shared table");
1770 dbus_free (connection->server_guid);
1771 connection->server_guid = NULL;
1775 _dbus_list_remove (&shared_connections_no_guid, connection);
1778 _DBUS_UNLOCK (shared_connections);
1780 /* remove our reference held on all shareable connections */
1781 _dbus_connection_unref_unlocked (connection);
1784 static DBusConnection*
1785 connection_try_from_address_entry (DBusAddressEntry *entry,
1788 DBusTransport *transport;
1789 DBusConnection *connection;
1791 transport = _dbus_transport_open (entry, error);
1793 if (transport == NULL)
1795 _DBUS_ASSERT_ERROR_IS_SET (error);
1799 connection = _dbus_connection_new_for_transport (transport);
1801 _dbus_transport_unref (transport);
1803 if (connection == NULL)
1805 _DBUS_SET_OOM (error);
1809 #ifndef DBUS_DISABLE_CHECKS
1810 _dbus_assert (!connection->have_connection_lock);
1816 * If the shared parameter is true, then any existing connection will
1817 * be used (and if a new connection is created, it will be available
1818 * for use by others). If the shared parameter is false, a new
1819 * connection will always be created, and the new connection will
1820 * never be returned to other callers.
1822 * @param address the address
1823 * @param shared whether the connection is shared or private
1824 * @param error error return
1825 * @returns the connection or #NULL on error
1827 static DBusConnection*
1828 _dbus_connection_open_internal (const char *address,
1832 DBusConnection *connection;
1833 DBusAddressEntry **entries;
1834 DBusError tmp_error = DBUS_ERROR_INIT;
1835 DBusError first_error = DBUS_ERROR_INIT;
1838 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1840 _dbus_verbose ("opening %s connection to: %s\n",
1841 shared ? "shared" : "private", address);
1843 if (!dbus_parse_address (address, &entries, &len, error))
1846 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1850 for (i = 0; i < len; i++)
1854 if (!connection_lookup_shared (entries[i], &connection))
1855 _DBUS_SET_OOM (&tmp_error);
1858 if (connection == NULL)
1860 connection = connection_try_from_address_entry (entries[i],
1863 if (connection != NULL && shared)
1867 connection->shareable = TRUE;
1869 /* guid may be NULL */
1870 guid = dbus_address_entry_get_value (entries[i], "guid");
1872 CONNECTION_LOCK (connection);
1874 if (!connection_record_shared_unlocked (connection, guid))
1876 _DBUS_SET_OOM (&tmp_error);
1877 _dbus_connection_close_possibly_shared_and_unlock (connection);
1878 dbus_connection_unref (connection);
1882 CONNECTION_UNLOCK (connection);
1889 _DBUS_ASSERT_ERROR_IS_SET (&tmp_error);
1892 dbus_move_error (&tmp_error, &first_error);
1894 dbus_error_free (&tmp_error);
1897 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1898 _DBUS_ASSERT_ERROR_IS_CLEAR (&tmp_error);
1900 if (connection == NULL)
1902 _DBUS_ASSERT_ERROR_IS_SET (&first_error);
1903 dbus_move_error (&first_error, error);
1906 dbus_error_free (&first_error);
1908 dbus_address_entries_free (entries);
1913 * Closes a shared OR private connection, while dbus_connection_close() can
1914 * only be used on private connections. Should only be called by the
1915 * dbus code that owns the connection - an owner must be known,
1916 * the open/close state is like malloc/free, not like ref/unref.
1918 * @param connection the connection
1921 _dbus_connection_close_possibly_shared (DBusConnection *connection)
1923 _dbus_assert (connection != NULL);
1924 _dbus_assert (connection->generation == _dbus_current_generation);
1926 CONNECTION_LOCK (connection);
1927 _dbus_connection_close_possibly_shared_and_unlock (connection);
1930 static DBusPreallocatedSend*
1931 _dbus_connection_preallocate_send_unlocked (DBusConnection *connection)
1933 DBusPreallocatedSend *preallocated;
1935 HAVE_LOCK_CHECK (connection);
1937 _dbus_assert (connection != NULL);
1939 preallocated = dbus_new (DBusPreallocatedSend, 1);
1940 if (preallocated == NULL)
1943 preallocated->queue_link = _dbus_list_alloc_link (NULL);
1944 if (preallocated->queue_link == NULL)
1947 preallocated->counter_link = _dbus_list_alloc_link (connection->outgoing_counter);
1948 if (preallocated->counter_link == NULL)
1951 _dbus_counter_ref (preallocated->counter_link->data);
1953 preallocated->connection = connection;
1955 return preallocated;
1958 _dbus_list_free_link (preallocated->queue_link);
1960 dbus_free (preallocated);
1965 /* Called with lock held, does not update dispatch status */
1967 _dbus_connection_send_preallocated_unlocked_no_update (DBusConnection *connection,
1968 DBusPreallocatedSend *preallocated,
1969 DBusMessage *message,
1970 dbus_uint32_t *client_serial)
1972 dbus_uint32_t serial;
1974 preallocated->queue_link->data = message;
1975 _dbus_list_prepend_link (&connection->outgoing_messages,
1976 preallocated->queue_link);
1978 /* It's OK that we'll never call the notify function, because for the
1979 * outgoing limit, there isn't one */
1980 _dbus_message_add_counter_link (message,
1981 preallocated->counter_link);
1983 dbus_free (preallocated);
1984 preallocated = NULL;
1986 dbus_message_ref (message);
1988 connection->n_outgoing += 1;
1990 _dbus_verbose ("Message %p (%s %s %s %s '%s') for %s added to outgoing queue %p, %d pending to send\n",
1992 dbus_message_type_to_string (dbus_message_get_type (message)),
1993 dbus_message_get_path (message) ?
1994 dbus_message_get_path (message) :
1996 dbus_message_get_interface (message) ?
1997 dbus_message_get_interface (message) :
1999 dbus_message_get_member (message) ?
2000 dbus_message_get_member (message) :
2002 dbus_message_get_signature (message),
2003 dbus_message_get_destination (message) ?
2004 dbus_message_get_destination (message) :
2007 connection->n_outgoing);
2009 if (dbus_message_get_serial (message) == 0)
2011 serial = _dbus_connection_get_next_client_serial (connection);
2012 dbus_message_set_serial (message, serial);
2014 *client_serial = serial;
2019 *client_serial = dbus_message_get_serial (message);
2022 _dbus_verbose ("Message %p serial is %u\n",
2023 message, dbus_message_get_serial (message));
2025 dbus_message_lock (message);
2027 /* Now we need to run an iteration to hopefully just write the messages
2028 * out immediately, and otherwise get them queued up
2030 _dbus_connection_do_iteration_unlocked (connection,
2032 DBUS_ITERATION_DO_WRITING,
2035 /* If stuff is still queued up, be sure we wake up the main loop */
2036 if (connection->n_outgoing > 0)
2037 _dbus_connection_wakeup_mainloop (connection);
2041 _dbus_connection_send_preallocated_and_unlock (DBusConnection *connection,
2042 DBusPreallocatedSend *preallocated,
2043 DBusMessage *message,
2044 dbus_uint32_t *client_serial)
2046 DBusDispatchStatus status;
2048 HAVE_LOCK_CHECK (connection);
2050 _dbus_connection_send_preallocated_unlocked_no_update (connection,
2052 message, client_serial);
2054 _dbus_verbose ("middle\n");
2055 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2057 /* this calls out to user code */
2058 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2062 * Like dbus_connection_send(), but assumes the connection
2063 * is already locked on function entry, and unlocks before returning.
2065 * @param connection the connection
2066 * @param message the message to send
2067 * @param client_serial return location for client serial of sent message
2068 * @returns #FALSE on out-of-memory
2071 _dbus_connection_send_and_unlock (DBusConnection *connection,
2072 DBusMessage *message,
2073 dbus_uint32_t *client_serial)
2075 DBusPreallocatedSend *preallocated;
2077 _dbus_assert (connection != NULL);
2078 _dbus_assert (message != NULL);
2080 preallocated = _dbus_connection_preallocate_send_unlocked (connection);
2081 if (preallocated == NULL)
2083 CONNECTION_UNLOCK (connection);
2087 _dbus_connection_send_preallocated_and_unlock (connection,
2095 * Used internally to handle the semantics of dbus_server_set_new_connection_function().
2096 * If the new connection function does not ref the connection, we want to close it.
2098 * A bit of a hack, probably the new connection function should have returned a value
2099 * for whether to close, or should have had to close the connection itself if it
2102 * But, this works OK as long as the new connection function doesn't do anything
2103 * crazy like keep the connection around without ref'ing it.
2105 * We have to lock the connection across refcount check and close in case
2106 * the new connection function spawns a thread that closes and unrefs.
2107 * In that case, if the app thread
2108 * closes and unrefs first, we'll harmlessly close again; if the app thread
2109 * still has the ref, we'll close and then the app will close harmlessly.
2110 * If the app unrefs without closing, the app is broken since if the
2111 * app refs from the new connection function it is supposed to also close.
2113 * If we didn't atomically check the refcount and close with the lock held
2114 * though, we could screw this up.
2116 * @param connection the connection
2119 _dbus_connection_close_if_only_one_ref (DBusConnection *connection)
2121 dbus_int32_t refcount;
2123 CONNECTION_LOCK (connection);
2125 refcount = _dbus_atomic_get (&connection->refcount);
2126 /* The caller should have at least one ref */
2127 _dbus_assert (refcount >= 1);
2130 _dbus_connection_close_possibly_shared_and_unlock (connection);
2132 CONNECTION_UNLOCK (connection);
2137 * When a function that blocks has been called with a timeout, and we
2138 * run out of memory, the time to wait for memory is based on the
2139 * timeout. If the caller was willing to block a long time we wait a
2140 * relatively long time for memory, if they were only willing to block
2141 * briefly then we retry for memory at a rapid rate.
2143 * @timeout_milliseconds the timeout requested for blocking
2146 _dbus_memory_pause_based_on_timeout (int timeout_milliseconds)
2148 if (timeout_milliseconds == -1)
2149 _dbus_sleep_milliseconds (1000);
2150 else if (timeout_milliseconds < 100)
2151 ; /* just busy loop */
2152 else if (timeout_milliseconds <= 1000)
2153 _dbus_sleep_milliseconds (timeout_milliseconds / 3);
2155 _dbus_sleep_milliseconds (1000);
2158 static DBusMessage *
2159 generate_local_error_message (dbus_uint32_t serial,
2163 DBusMessage *message;
2164 message = dbus_message_new (DBUS_MESSAGE_TYPE_ERROR);
2168 if (!dbus_message_set_error_name (message, error_name))
2170 dbus_message_unref (message);
2175 dbus_message_set_no_reply (message, TRUE);
2177 if (!dbus_message_set_reply_serial (message,
2180 dbus_message_unref (message);
2185 if (error_msg != NULL)
2187 DBusMessageIter iter;
2189 dbus_message_iter_init_append (message, &iter);
2190 if (!dbus_message_iter_append_basic (&iter,
2194 dbus_message_unref (message);
2205 * Peek the incoming queue to see if we got reply for a specific serial
2208 _dbus_connection_peek_for_reply_unlocked (DBusConnection *connection,
2209 dbus_uint32_t client_serial)
2212 HAVE_LOCK_CHECK (connection);
2214 link = _dbus_list_get_first_link (&connection->incoming_messages);
2216 while (link != NULL)
2218 DBusMessage *reply = link->data;
2220 if (dbus_message_get_reply_serial (reply) == client_serial)
2222 _dbus_verbose ("%s reply to %d found in queue\n", _DBUS_FUNCTION_NAME, client_serial);
2225 link = _dbus_list_get_next_link (&connection->incoming_messages, link);
2231 /* This is slightly strange since we can pop a message here without
2232 * the dispatch lock.
2235 check_for_reply_unlocked (DBusConnection *connection,
2236 dbus_uint32_t client_serial)
2240 HAVE_LOCK_CHECK (connection);
2242 link = _dbus_list_get_first_link (&connection->incoming_messages);
2244 while (link != NULL)
2246 DBusMessage *reply = link->data;
2248 if (dbus_message_get_reply_serial (reply) == client_serial)
2250 _dbus_list_remove_link (&connection->incoming_messages, link);
2251 connection->n_incoming -= 1;
2254 link = _dbus_list_get_next_link (&connection->incoming_messages, link);
2261 connection_timeout_and_complete_all_pending_calls_unlocked (DBusConnection *connection)
2263 /* We can't iterate over the hash in the normal way since we'll be
2264 * dropping the lock for each item. So we restart the
2265 * iter each time as we drain the hash table.
2268 while (_dbus_hash_table_get_n_entries (connection->pending_replies) > 0)
2270 DBusPendingCall *pending;
2273 _dbus_hash_iter_init (connection->pending_replies, &iter);
2274 _dbus_hash_iter_next (&iter);
2276 pending = _dbus_hash_iter_get_value (&iter);
2277 _dbus_pending_call_ref_unlocked (pending);
2279 _dbus_pending_call_queue_timeout_error_unlocked (pending,
2282 if (_dbus_pending_call_is_timeout_added_unlocked (pending))
2283 _dbus_connection_remove_timeout_unlocked (connection,
2284 _dbus_pending_call_get_timeout_unlocked (pending));
2285 _dbus_pending_call_set_timeout_added_unlocked (pending, FALSE);
2286 _dbus_hash_iter_remove_entry (&iter);
2288 _dbus_pending_call_unref_and_unlock (pending);
2289 CONNECTION_LOCK (connection);
2291 HAVE_LOCK_CHECK (connection);
2295 complete_pending_call_and_unlock (DBusConnection *connection,
2296 DBusPendingCall *pending,
2297 DBusMessage *message)
2299 _dbus_pending_call_set_reply_unlocked (pending, message);
2300 _dbus_pending_call_ref_unlocked (pending); /* in case there's no app with a ref held */
2301 _dbus_connection_detach_pending_call_and_unlock (connection, pending);
2303 /* Must be called unlocked since it invokes app callback */
2304 _dbus_pending_call_complete (pending);
2305 dbus_pending_call_unref (pending);
2309 check_for_reply_and_update_dispatch_unlocked (DBusConnection *connection,
2310 DBusPendingCall *pending)
2313 DBusDispatchStatus status;
2315 reply = check_for_reply_unlocked (connection,
2316 _dbus_pending_call_get_reply_serial_unlocked (pending));
2319 _dbus_verbose ("checked for reply\n");
2321 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): got reply\n");
2323 complete_pending_call_and_unlock (connection, pending, reply);
2324 dbus_message_unref (reply);
2326 CONNECTION_LOCK (connection);
2327 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2328 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2329 dbus_pending_call_unref (pending);
2338 * Blocks until a pending call times out or gets a reply.
2340 * Does not re-enter the main loop or run filter/path-registered
2341 * callbacks. The reply to the message will not be seen by
2344 * Returns immediately if pending call already got a reply.
2346 * @todo could use performance improvements (it keeps scanning
2347 * the whole message queue for example)
2349 * @param pending the pending call we block for a reply on
2352 _dbus_connection_block_pending_call (DBusPendingCall *pending)
2354 long start_tv_sec, start_tv_usec;
2355 long tv_sec, tv_usec;
2356 DBusDispatchStatus status;
2357 DBusConnection *connection;
2358 dbus_uint32_t client_serial;
2359 DBusTimeout *timeout;
2360 int timeout_milliseconds, elapsed_milliseconds;
2362 _dbus_assert (pending != NULL);
2364 if (dbus_pending_call_get_completed (pending))
2367 dbus_pending_call_ref (pending); /* necessary because the call could be canceled */
2369 connection = _dbus_pending_call_get_connection_and_lock (pending);
2371 /* Flush message queue - note, can affect dispatch status */
2372 _dbus_connection_flush_unlocked (connection);
2374 client_serial = _dbus_pending_call_get_reply_serial_unlocked (pending);
2376 /* note that timeout_milliseconds is limited to a smallish value
2377 * in _dbus_pending_call_new() so overflows aren't possible
2380 timeout = _dbus_pending_call_get_timeout_unlocked (pending);
2381 _dbus_get_current_time (&start_tv_sec, &start_tv_usec);
2384 timeout_milliseconds = dbus_timeout_get_interval (timeout);
2386 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): will block %d milliseconds for reply serial %u from %ld sec %ld usec\n",
2387 timeout_milliseconds,
2389 start_tv_sec, start_tv_usec);
2393 timeout_milliseconds = -1;
2395 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): will block for reply serial %u\n", client_serial);
2398 /* check to see if we already got the data off the socket */
2399 /* from another blocked pending call */
2400 if (check_for_reply_and_update_dispatch_unlocked (connection, pending))
2403 /* Now we wait... */
2404 /* always block at least once as we know we don't have the reply yet */
2405 _dbus_connection_do_iteration_unlocked (connection,
2407 DBUS_ITERATION_DO_READING |
2408 DBUS_ITERATION_BLOCK,
2409 timeout_milliseconds);
2413 _dbus_verbose ("top of recheck\n");
2415 HAVE_LOCK_CHECK (connection);
2417 /* queue messages and get status */
2419 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2421 /* the get_completed() is in case a dispatch() while we were blocking
2422 * got the reply instead of us.
2424 if (_dbus_pending_call_get_completed_unlocked (pending))
2426 _dbus_verbose ("Pending call completed by dispatch\n");
2427 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2428 dbus_pending_call_unref (pending);
2432 if (status == DBUS_DISPATCH_DATA_REMAINS)
2434 if (check_for_reply_and_update_dispatch_unlocked (connection, pending))
2438 _dbus_get_current_time (&tv_sec, &tv_usec);
2439 elapsed_milliseconds = (tv_sec - start_tv_sec) * 1000 +
2440 (tv_usec - start_tv_usec) / 1000;
2442 if (!_dbus_connection_get_is_connected_unlocked (connection))
2444 DBusMessage *error_msg;
2446 error_msg = generate_local_error_message (client_serial,
2447 DBUS_ERROR_DISCONNECTED,
2448 "Connection was disconnected before a reply was received");
2450 /* on OOM error_msg is set to NULL */
2451 complete_pending_call_and_unlock (connection, pending, error_msg);
2452 dbus_pending_call_unref (pending);
2455 else if (connection->disconnect_message_link == NULL)
2456 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): disconnected\n");
2457 else if (timeout == NULL)
2459 if (status == DBUS_DISPATCH_NEED_MEMORY)
2461 /* Try sleeping a bit, as we aren't sure we need to block for reading,
2462 * we may already have a reply in the buffer and just can't process
2465 _dbus_verbose ("dbus_connection_send_with_reply_and_block() waiting for more memory\n");
2467 _dbus_memory_pause_based_on_timeout (timeout_milliseconds - elapsed_milliseconds);
2471 /* block again, we don't have the reply buffered yet. */
2472 _dbus_connection_do_iteration_unlocked (connection,
2474 DBUS_ITERATION_DO_READING |
2475 DBUS_ITERATION_BLOCK,
2476 timeout_milliseconds - elapsed_milliseconds);
2479 goto recheck_status;
2481 else if (tv_sec < start_tv_sec)
2482 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): clock set backward\n");
2483 else if (elapsed_milliseconds < timeout_milliseconds)
2485 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): %d milliseconds remain\n", timeout_milliseconds - elapsed_milliseconds);
2487 if (status == DBUS_DISPATCH_NEED_MEMORY)
2489 /* Try sleeping a bit, as we aren't sure we need to block for reading,
2490 * we may already have a reply in the buffer and just can't process
2493 _dbus_verbose ("dbus_connection_send_with_reply_and_block() waiting for more memory\n");
2495 _dbus_memory_pause_based_on_timeout (timeout_milliseconds - elapsed_milliseconds);
2499 /* block again, we don't have the reply buffered yet. */
2500 _dbus_connection_do_iteration_unlocked (connection,
2502 DBUS_ITERATION_DO_READING |
2503 DBUS_ITERATION_BLOCK,
2504 timeout_milliseconds - elapsed_milliseconds);
2507 goto recheck_status;
2510 _dbus_verbose ("dbus_connection_send_with_reply_and_block(): Waited %d milliseconds and got no reply\n",
2511 elapsed_milliseconds);
2513 _dbus_assert (!_dbus_pending_call_get_completed_unlocked (pending));
2515 /* unlock and call user code */
2516 complete_pending_call_and_unlock (connection, pending, NULL);
2518 /* update user code on dispatch status */
2519 CONNECTION_LOCK (connection);
2520 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2521 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2522 dbus_pending_call_unref (pending);
2528 * @addtogroup DBusConnection
2534 * Gets a connection to a remote address. If a connection to the given
2535 * address already exists, returns the existing connection with its
2536 * reference count incremented. Otherwise, returns a new connection
2537 * and saves the new connection for possible re-use if a future call
2538 * to dbus_connection_open() asks to connect to the same server.
2540 * Use dbus_connection_open_private() to get a dedicated connection
2541 * not shared with other callers of dbus_connection_open().
2543 * If the open fails, the function returns #NULL, and provides a
2544 * reason for the failure in the error parameter. Pass #NULL for the
2545 * error parameter if you aren't interested in the reason for
2548 * Because this connection is shared, no user of the connection
2549 * may call dbus_connection_close(). However, when you are done with the
2550 * connection you should call dbus_connection_unref().
2552 * @note Prefer dbus_connection_open() to dbus_connection_open_private()
2553 * unless you have good reason; connections are expensive enough
2554 * that it's wasteful to create lots of connections to the same
2557 * @param address the address.
2558 * @param error address where an error can be returned.
2559 * @returns new connection, or #NULL on failure.
2562 dbus_connection_open (const char *address,
2565 DBusConnection *connection;
2567 _dbus_return_val_if_fail (address != NULL, NULL);
2568 _dbus_return_val_if_error_is_set (error, NULL);
2570 connection = _dbus_connection_open_internal (address,
2578 * Opens a new, dedicated connection to a remote address. Unlike
2579 * dbus_connection_open(), always creates a new connection.
2580 * This connection will not be saved or recycled by libdbus.
2582 * If the open fails, the function returns #NULL, and provides a
2583 * reason for the failure in the error parameter. Pass #NULL for the
2584 * error parameter if you aren't interested in the reason for
2587 * When you are done with this connection, you must
2588 * dbus_connection_close() to disconnect it,
2589 * and dbus_connection_unref() to free the connection object.
2591 * (The dbus_connection_close() can be skipped if the
2592 * connection is already known to be disconnected, for example
2593 * if you are inside a handler for the Disconnected signal.)
2595 * @note Prefer dbus_connection_open() to dbus_connection_open_private()
2596 * unless you have good reason; connections are expensive enough
2597 * that it's wasteful to create lots of connections to the same
2600 * @param address the address.
2601 * @param error address where an error can be returned.
2602 * @returns new connection, or #NULL on failure.
2605 dbus_connection_open_private (const char *address,
2608 DBusConnection *connection;
2610 _dbus_return_val_if_fail (address != NULL, NULL);
2611 _dbus_return_val_if_error_is_set (error, NULL);
2613 connection = _dbus_connection_open_internal (address,
2621 * Increments the reference count of a DBusConnection.
2623 * @param connection the connection.
2624 * @returns the connection.
2627 dbus_connection_ref (DBusConnection *connection)
2629 _dbus_return_val_if_fail (connection != NULL, NULL);
2630 _dbus_return_val_if_fail (connection->generation == _dbus_current_generation, NULL);
2632 _dbus_atomic_inc (&connection->refcount);
2638 free_outgoing_message (void *element,
2641 DBusMessage *message = element;
2642 DBusConnection *connection = data;
2644 _dbus_message_remove_counter (message,
2645 connection->outgoing_counter,
2647 dbus_message_unref (message);
2650 /* This is run without the mutex held, but after the last reference
2651 * to the connection has been dropped we should have no thread-related
2655 _dbus_connection_last_unref (DBusConnection *connection)
2659 _dbus_verbose ("Finalizing connection %p\n", connection);
2661 _dbus_assert (_dbus_atomic_get (&connection->refcount) == 0);
2663 /* You have to disconnect the connection before unref:ing it. Otherwise
2664 * you won't get the disconnected message.
2666 _dbus_assert (!_dbus_transport_get_is_connected (connection->transport));
2667 _dbus_assert (connection->server_guid == NULL);
2669 /* ---- We're going to call various application callbacks here, hope it doesn't break anything... */
2670 _dbus_object_tree_free_all_unlocked (connection->objects);
2672 dbus_connection_set_dispatch_status_function (connection, NULL, NULL, NULL);
2673 dbus_connection_set_wakeup_main_function (connection, NULL, NULL, NULL);
2674 dbus_connection_set_unix_user_function (connection, NULL, NULL, NULL);
2676 _dbus_watch_list_free (connection->watches);
2677 connection->watches = NULL;
2679 _dbus_timeout_list_free (connection->timeouts);
2680 connection->timeouts = NULL;
2682 _dbus_data_slot_list_free (&connection->slot_list);
2684 link = _dbus_list_get_first_link (&connection->filter_list);
2685 while (link != NULL)
2687 DBusMessageFilter *filter = link->data;
2688 DBusList *next = _dbus_list_get_next_link (&connection->filter_list, link);
2690 filter->function = NULL;
2691 _dbus_message_filter_unref (filter); /* calls app callback */
2696 _dbus_list_clear (&connection->filter_list);
2698 /* ---- Done with stuff that invokes application callbacks */
2700 _dbus_object_tree_unref (connection->objects);
2702 _dbus_hash_table_unref (connection->pending_replies);
2703 connection->pending_replies = NULL;
2705 _dbus_list_clear (&connection->filter_list);
2707 _dbus_list_foreach (&connection->outgoing_messages,
2708 free_outgoing_message,
2710 _dbus_list_clear (&connection->outgoing_messages);
2712 _dbus_list_foreach (&connection->incoming_messages,
2713 (DBusForeachFunction) dbus_message_unref,
2715 _dbus_list_clear (&connection->incoming_messages);
2717 _dbus_counter_unref (connection->outgoing_counter);
2719 _dbus_transport_unref (connection->transport);
2721 if (connection->disconnect_message_link)
2723 DBusMessage *message = connection->disconnect_message_link->data;
2724 dbus_message_unref (message);
2725 _dbus_list_free_link (connection->disconnect_message_link);
2728 _dbus_condvar_free_at_location (&connection->dispatch_cond);
2729 _dbus_condvar_free_at_location (&connection->io_path_cond);
2731 _dbus_mutex_free_at_location (&connection->io_path_mutex);
2732 _dbus_mutex_free_at_location (&connection->dispatch_mutex);
2734 _dbus_mutex_free_at_location (&connection->slot_mutex);
2736 _dbus_mutex_free_at_location (&connection->mutex);
2738 dbus_free (connection);
2742 * Decrements the reference count of a DBusConnection, and finalizes
2743 * it if the count reaches zero.
2745 * Note: it is a bug to drop the last reference to a connection that
2746 * is still connected.
2748 * For shared connections, libdbus will own a reference
2749 * as long as the connection is connected, so you can know that either
2750 * you don't have the last reference, or it's OK to drop the last reference.
2751 * Most connections are shared. dbus_connection_open() and dbus_bus_get()
2752 * return shared connections.
2754 * For private connections, the creator of the connection must arrange for
2755 * dbus_connection_close() to be called prior to dropping the last reference.
2756 * Private connections come from dbus_connection_open_private() or dbus_bus_get_private().
2758 * @param connection the connection.
2761 dbus_connection_unref (DBusConnection *connection)
2763 dbus_bool_t last_unref;
2765 _dbus_return_if_fail (connection != NULL);
2766 _dbus_return_if_fail (connection->generation == _dbus_current_generation);
2768 last_unref = (_dbus_atomic_dec (&connection->refcount) == 1);
2772 #ifndef DBUS_DISABLE_CHECKS
2773 if (_dbus_transport_get_is_connected (connection->transport))
2775 _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",
2776 connection->shareable ?
2777 "Most likely, the application called unref() too many times and removed a reference belonging to libdbus, since this is a shared connection.\n" :
2778 "Most likely, the application was supposed to call dbus_connection_close(), since this is a private connection.\n");
2782 _dbus_connection_last_unref (connection);
2787 * Note that the transport can disconnect itself (other end drops us)
2788 * and in that case this function never runs. So this function must
2789 * not do anything more than disconnect the transport and update the
2792 * If the transport self-disconnects, then we assume someone will
2793 * dispatch the connection to cause the dispatch status update.
2796 _dbus_connection_close_possibly_shared_and_unlock (DBusConnection *connection)
2798 DBusDispatchStatus status;
2800 HAVE_LOCK_CHECK (connection);
2802 _dbus_verbose ("Disconnecting %p\n", connection);
2804 /* We need to ref because update_dispatch_status_and_unlock will unref
2805 * the connection if it was shared and libdbus was the only remaining
2808 _dbus_connection_ref_unlocked (connection);
2810 _dbus_transport_disconnect (connection->transport);
2812 /* This has the side effect of queuing the disconnect message link
2813 * (unless we don't have enough memory, possibly, so don't assert it).
2814 * After the disconnect message link is queued, dbus_bus_get/dbus_connection_open
2815 * should never again return the newly-disconnected connection.
2817 * However, we only unref the shared connection and exit_on_disconnect when
2818 * the disconnect message reaches the head of the message queue,
2819 * NOT when it's first queued.
2821 status = _dbus_connection_get_dispatch_status_unlocked (connection);
2823 /* This calls out to user code */
2824 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
2826 /* Could also call out to user code */
2827 dbus_connection_unref (connection);
2831 * Closes a private connection, so no further data can be sent or received.
2832 * This disconnects the transport (such as a socket) underlying the
2835 * Attempts to send messages after closing a connection are safe, but will result in
2836 * error replies generated locally in libdbus.
2838 * This function does not affect the connection's reference count. It's
2839 * safe to close a connection more than once; all calls after the
2840 * first do nothing. It's impossible to "reopen" a connection, a
2841 * new connection must be created. This function may result in a call
2842 * to the DBusDispatchStatusFunction set with
2843 * dbus_connection_set_dispatch_status_function(), as the disconnect
2844 * message it generates needs to be dispatched.
2846 * If a connection is dropped by the remote application, it will
2849 * You must close a connection prior to releasing the last reference to
2850 * the connection. If you dbus_connection_unref() for the last time
2851 * without closing the connection, the results are undefined; it
2852 * is a bug in your program and libdbus will try to print a warning.
2854 * You may not close a shared connection. Connections created with
2855 * dbus_connection_open() or dbus_bus_get() are shared.
2856 * These connections are owned by libdbus, and applications should
2857 * only unref them, never close them. Applications can know it is
2858 * safe to unref these connections because libdbus will be holding a
2859 * reference as long as the connection is open. Thus, either the
2860 * connection is closed and it is OK to drop the last reference,
2861 * or the connection is open and the app knows it does not have the
2864 * Connections created with dbus_connection_open_private() or
2865 * dbus_bus_get_private() are not kept track of or referenced by
2866 * libdbus. The creator of these connections is responsible for
2867 * calling dbus_connection_close() prior to releasing the last
2868 * reference, if the connection is not already disconnected.
2870 * @param connection the private (unshared) connection to close
2873 dbus_connection_close (DBusConnection *connection)
2875 _dbus_return_if_fail (connection != NULL);
2876 _dbus_return_if_fail (connection->generation == _dbus_current_generation);
2878 CONNECTION_LOCK (connection);
2880 #ifndef DBUS_DISABLE_CHECKS
2881 if (connection->shareable)
2883 CONNECTION_UNLOCK (connection);
2885 _dbus_warn_check_failed ("Applications must not close shared connections - see dbus_connection_close() docs. This is a bug in the application.\n");
2890 _dbus_connection_close_possibly_shared_and_unlock (connection);
2894 _dbus_connection_get_is_connected_unlocked (DBusConnection *connection)
2896 HAVE_LOCK_CHECK (connection);
2897 return _dbus_transport_get_is_connected (connection->transport);
2901 * Gets whether the connection is currently open. A connection may
2902 * become disconnected when the remote application closes its end, or
2903 * exits; a connection may also be disconnected with
2904 * dbus_connection_close().
2906 * There are not separate states for "closed" and "disconnected," the two
2907 * terms are synonymous. This function should really be called
2908 * get_is_open() but for historical reasons is not.
2910 * @param connection the connection.
2911 * @returns #TRUE if the connection is still alive.
2914 dbus_connection_get_is_connected (DBusConnection *connection)
2918 _dbus_return_val_if_fail (connection != NULL, FALSE);
2920 CONNECTION_LOCK (connection);
2921 res = _dbus_connection_get_is_connected_unlocked (connection);
2922 CONNECTION_UNLOCK (connection);
2928 * Gets whether the connection was authenticated. (Note that
2929 * if the connection was authenticated then disconnected,
2930 * this function still returns #TRUE)
2932 * @param connection the connection
2933 * @returns #TRUE if the connection was ever authenticated
2936 dbus_connection_get_is_authenticated (DBusConnection *connection)
2940 _dbus_return_val_if_fail (connection != NULL, FALSE);
2942 CONNECTION_LOCK (connection);
2943 res = _dbus_transport_get_is_authenticated (connection->transport);
2944 CONNECTION_UNLOCK (connection);
2950 * Gets whether the connection is not authenticated as a specific
2951 * user. If the connection is not authenticated, this function
2952 * returns #TRUE, and if it is authenticated but as an anonymous user,
2953 * it returns #TRUE. If it is authenticated as a specific user, then
2954 * this returns #FALSE. (Note that if the connection was authenticated
2955 * as anonymous then disconnected, this function still returns #TRUE.)
2957 * If the connection is not anonymous, you can use
2958 * dbus_connection_get_unix_user() and
2959 * dbus_connection_get_windows_user() to see who it's authorized as.
2961 * If you want to prevent non-anonymous authorization, use
2962 * dbus_server_set_auth_mechanisms() to remove the mechanisms that
2963 * allow proving user identity (i.e. only allow the ANONYMOUS
2966 * @param connection the connection
2967 * @returns #TRUE if not authenticated or authenticated as anonymous
2970 dbus_connection_get_is_anonymous (DBusConnection *connection)
2974 _dbus_return_val_if_fail (connection != NULL, FALSE);
2976 CONNECTION_LOCK (connection);
2977 res = _dbus_transport_get_is_anonymous (connection->transport);
2978 CONNECTION_UNLOCK (connection);
2984 * Gets the ID of the server address we are authenticated to, if this
2985 * connection is on the client side. If the connection is on the
2986 * server side, this will always return #NULL - use dbus_server_get_id()
2987 * to get the ID of your own server, if you are the server side.
2989 * If a client-side connection is not authenticated yet, the ID may be
2990 * available if it was included in the server address, but may not be
2991 * available. The only way to be sure the server ID is available
2992 * is to wait for authentication to complete.
2994 * In general, each mode of connecting to a given server will have
2995 * its own ID. So for example, if the session bus daemon is listening
2996 * on UNIX domain sockets and on TCP, then each of those modalities
2997 * will have its own server ID.
2999 * If you want an ID that identifies an entire session bus, look at
3000 * dbus_bus_get_id() instead (which is just a convenience wrapper
3001 * around the org.freedesktop.DBus.GetId method invoked on the bus).
3003 * You can also get a machine ID; see dbus_get_local_machine_id() to
3004 * get the machine you are on. There isn't a convenience wrapper, but
3005 * you can invoke org.freedesktop.DBus.Peer.GetMachineId on any peer
3006 * to get the machine ID on the other end.
3008 * The D-Bus specification describes the server ID and other IDs in a
3011 * @param connection the connection
3012 * @returns the server ID or #NULL if no memory or the connection is server-side
3015 dbus_connection_get_server_id (DBusConnection *connection)
3019 _dbus_return_val_if_fail (connection != NULL, NULL);
3021 CONNECTION_LOCK (connection);
3022 id = _dbus_strdup (_dbus_transport_get_server_id (connection->transport));
3023 CONNECTION_UNLOCK (connection);
3029 * Tests whether a certain type can be send via the connection. This
3030 * will always return TRUE for all types, with the exception of
3031 * DBUS_TYPE_UNIX_FD. The function will return TRUE for
3032 * DBUS_TYPE_UNIX_FD only on systems that know Unix file descriptors
3033 * and can send them via the chosen transport and when the remote side
3036 * This function can be used to do runtime checking for types that
3037 * might be unknown to the specific D-Bus client implementation
3038 * version, i.e. it will return FALSE for all types this
3039 * implementation does not know, including invalid or reserved types.
3041 * @param connection the connection
3042 * @param type the type to check
3043 * @returns TRUE if the type may be send via the connection
3046 dbus_connection_can_send_type(DBusConnection *connection,
3049 _dbus_return_val_if_fail (connection != NULL, FALSE);
3051 if (!dbus_type_is_valid (type))
3054 if (type != DBUS_TYPE_UNIX_FD)
3057 #ifdef HAVE_UNIX_FD_PASSING
3061 CONNECTION_LOCK(connection);
3062 b = _dbus_transport_can_pass_unix_fd(connection->transport);
3063 CONNECTION_UNLOCK(connection);
3073 * Set whether _exit() should be called when the connection receives a
3074 * disconnect signal. The call to _exit() comes after any handlers for
3075 * the disconnect signal run; handlers can cancel the exit by calling
3078 * By default, exit_on_disconnect is #FALSE; but for message bus
3079 * connections returned from dbus_bus_get() it will be toggled on
3082 * @param connection the connection
3083 * @param exit_on_disconnect #TRUE if _exit() should be called after a disconnect signal
3086 dbus_connection_set_exit_on_disconnect (DBusConnection *connection,
3087 dbus_bool_t exit_on_disconnect)
3089 _dbus_return_if_fail (connection != NULL);
3091 CONNECTION_LOCK (connection);
3092 connection->exit_on_disconnect = exit_on_disconnect != FALSE;
3093 CONNECTION_UNLOCK (connection);
3097 * Preallocates resources needed to send a message, allowing the message
3098 * to be sent without the possibility of memory allocation failure.
3099 * Allows apps to create a future guarantee that they can send
3100 * a message regardless of memory shortages.
3102 * @param connection the connection we're preallocating for.
3103 * @returns the preallocated resources, or #NULL
3105 DBusPreallocatedSend*
3106 dbus_connection_preallocate_send (DBusConnection *connection)
3108 DBusPreallocatedSend *preallocated;
3110 _dbus_return_val_if_fail (connection != NULL, NULL);
3112 CONNECTION_LOCK (connection);
3115 _dbus_connection_preallocate_send_unlocked (connection);
3117 CONNECTION_UNLOCK (connection);
3119 return preallocated;
3123 * Frees preallocated message-sending resources from
3124 * dbus_connection_preallocate_send(). Should only
3125 * be called if the preallocated resources are not used
3126 * to send a message.
3128 * @param connection the connection
3129 * @param preallocated the resources
3132 dbus_connection_free_preallocated_send (DBusConnection *connection,
3133 DBusPreallocatedSend *preallocated)
3135 _dbus_return_if_fail (connection != NULL);
3136 _dbus_return_if_fail (preallocated != NULL);
3137 _dbus_return_if_fail (connection == preallocated->connection);
3139 _dbus_list_free_link (preallocated->queue_link);
3140 _dbus_counter_unref (preallocated->counter_link->data);
3141 _dbus_list_free_link (preallocated->counter_link);
3142 dbus_free (preallocated);
3146 * Sends a message using preallocated resources. This function cannot fail.
3147 * It works identically to dbus_connection_send() in other respects.
3148 * Preallocated resources comes from dbus_connection_preallocate_send().
3149 * This function "consumes" the preallocated resources, they need not
3150 * be freed separately.
3152 * @param connection the connection
3153 * @param preallocated the preallocated resources
3154 * @param message the message to send
3155 * @param client_serial return location for client serial assigned to the message
3158 dbus_connection_send_preallocated (DBusConnection *connection,
3159 DBusPreallocatedSend *preallocated,
3160 DBusMessage *message,
3161 dbus_uint32_t *client_serial)
3163 _dbus_return_if_fail (connection != NULL);
3164 _dbus_return_if_fail (preallocated != NULL);
3165 _dbus_return_if_fail (message != NULL);
3166 _dbus_return_if_fail (preallocated->connection == connection);
3167 _dbus_return_if_fail (dbus_message_get_type (message) != DBUS_MESSAGE_TYPE_METHOD_CALL ||
3168 dbus_message_get_member (message) != NULL);
3169 _dbus_return_if_fail (dbus_message_get_type (message) != DBUS_MESSAGE_TYPE_SIGNAL ||
3170 (dbus_message_get_interface (message) != NULL &&
3171 dbus_message_get_member (message) != NULL));
3173 CONNECTION_LOCK (connection);
3175 #ifdef HAVE_UNIX_FD_PASSING
3177 if (!_dbus_transport_can_pass_unix_fd(connection->transport) &&
3178 message->n_unix_fds > 0)
3180 /* Refuse to send fds on a connection that cannot handle
3181 them. Unfortunately we cannot return a proper error here, so
3182 the best we can is just return. */
3183 CONNECTION_UNLOCK (connection);
3189 _dbus_connection_send_preallocated_and_unlock (connection,
3191 message, client_serial);
3195 _dbus_connection_send_unlocked_no_update (DBusConnection *connection,
3196 DBusMessage *message,
3197 dbus_uint32_t *client_serial)
3199 DBusPreallocatedSend *preallocated;
3201 _dbus_assert (connection != NULL);
3202 _dbus_assert (message != NULL);
3204 preallocated = _dbus_connection_preallocate_send_unlocked (connection);
3205 if (preallocated == NULL)
3208 _dbus_connection_send_preallocated_unlocked_no_update (connection,
3216 * Adds a message to the outgoing message queue. Does not block to
3217 * write the message to the network; that happens asynchronously. To
3218 * force the message to be written, call dbus_connection_flush() however
3219 * it is not necessary to call dbus_connection_flush() by hand; the
3220 * message will be sent the next time the main loop is run.
3221 * dbus_connection_flush() should only be used, for example, if
3222 * the application was expected to exit before running the main loop.
3224 * Because this only queues the message, the only reason it can
3225 * fail is lack of memory. Even if the connection is disconnected,
3226 * no error will be returned. If the function fails due to lack of memory,
3227 * it returns #FALSE. The function will never fail for other reasons; even
3228 * if the connection is disconnected, you can queue an outgoing message,
3229 * though obviously it won't be sent.
3231 * The message serial is used by the remote application to send a
3232 * reply; see dbus_message_get_serial() or the D-Bus specification.
3234 * dbus_message_unref() can be called as soon as this method returns
3235 * as the message queue will hold its own ref until the message is sent.
3237 * @param connection the connection.
3238 * @param message the message to write.
3239 * @param serial return location for message serial, or #NULL if you don't care
3240 * @returns #TRUE on success.
3243 dbus_connection_send (DBusConnection *connection,
3244 DBusMessage *message,
3245 dbus_uint32_t *serial)
3247 _dbus_return_val_if_fail (connection != NULL, FALSE);
3248 _dbus_return_val_if_fail (message != NULL, FALSE);
3250 CONNECTION_LOCK (connection);
3252 #ifdef HAVE_UNIX_FD_PASSING
3254 if (!_dbus_transport_can_pass_unix_fd(connection->transport) &&
3255 message->n_unix_fds > 0)
3257 /* Refuse to send fds on a connection that cannot handle
3258 them. Unfortunately we cannot return a proper error here, so
3259 the best we can is just return. */
3260 CONNECTION_UNLOCK (connection);
3266 return _dbus_connection_send_and_unlock (connection,
3272 reply_handler_timeout (void *data)
3274 DBusConnection *connection;
3275 DBusDispatchStatus status;
3276 DBusPendingCall *pending = data;
3278 connection = _dbus_pending_call_get_connection_and_lock (pending);
3279 _dbus_connection_ref_unlocked (connection);
3281 _dbus_pending_call_queue_timeout_error_unlocked (pending,
3283 _dbus_connection_remove_timeout_unlocked (connection,
3284 _dbus_pending_call_get_timeout_unlocked (pending));
3285 _dbus_pending_call_set_timeout_added_unlocked (pending, FALSE);
3287 _dbus_verbose ("middle\n");
3288 status = _dbus_connection_get_dispatch_status_unlocked (connection);
3290 /* Unlocks, and calls out to user code */
3291 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
3292 dbus_connection_unref (connection);
3298 * Queues a message to send, as with dbus_connection_send(),
3299 * but also returns a #DBusPendingCall used to receive a reply to the
3300 * message. If no reply is received in the given timeout_milliseconds,
3301 * this function expires the pending reply and generates a synthetic
3302 * error reply (generated in-process, not by the remote application)
3303 * indicating that a timeout occurred.
3305 * A #DBusPendingCall will see a reply message before any filters or
3306 * registered object path handlers. See dbus_connection_dispatch() for
3307 * details on when handlers are run.
3309 * A #DBusPendingCall will always see exactly one reply message,
3310 * unless it's cancelled with dbus_pending_call_cancel().
3312 * If #NULL is passed for the pending_return, the #DBusPendingCall
3313 * will still be generated internally, and used to track
3314 * the message reply timeout. This means a timeout error will
3315 * occur if no reply arrives, unlike with dbus_connection_send().
3317 * If -1 is passed for the timeout, a sane default timeout is used. -1
3318 * is typically the best value for the timeout for this reason, unless
3319 * you want a very short or very long timeout. If #DBUS_TIMEOUT_INFINITE is
3320 * passed for the timeout, no timeout will be set and the call will block
3323 * @warning if the connection is disconnected or you try to send Unix
3324 * file descriptors on a connection that does not support them, the
3325 * #DBusPendingCall will be set to #NULL, so be careful with this.
3327 * @param connection the connection
3328 * @param message the message to send
3329 * @param pending_return return location for a #DBusPendingCall
3330 * object, or #NULL if connection is disconnected or when you try to
3331 * send Unix file descriptors on a connection that does not support
3333 * @param timeout_milliseconds timeout in milliseconds, -1 (or
3334 * #DBUS_TIMEOUT_USE_DEFAULT) for default or #DBUS_TIMEOUT_INFINITE for no
3336 * @returns #FALSE if no memory, #TRUE otherwise.
3340 dbus_connection_send_with_reply (DBusConnection *connection,
3341 DBusMessage *message,
3342 DBusPendingCall **pending_return,
3343 int timeout_milliseconds)
3345 DBusPendingCall *pending;
3346 dbus_int32_t serial = -1;
3347 DBusDispatchStatus status;
3349 _dbus_return_val_if_fail (connection != NULL, FALSE);
3350 _dbus_return_val_if_fail (message != NULL, FALSE);
3351 _dbus_return_val_if_fail (timeout_milliseconds >= 0 || timeout_milliseconds == -1, FALSE);
3354 *pending_return = NULL;
3356 CONNECTION_LOCK (connection);
3358 #ifdef HAVE_UNIX_FD_PASSING
3360 if (!_dbus_transport_can_pass_unix_fd(connection->transport) &&
3361 message->n_unix_fds > 0)
3363 /* Refuse to send fds on a connection that cannot handle
3364 them. Unfortunately we cannot return a proper error here, so
3365 the best we can do is return TRUE but leave *pending_return
3367 CONNECTION_UNLOCK (connection);
3373 if (!_dbus_connection_get_is_connected_unlocked (connection))
3375 CONNECTION_UNLOCK (connection);
3380 pending = _dbus_pending_call_new_unlocked (connection,
3381 timeout_milliseconds,
3382 reply_handler_timeout);
3384 if (pending == NULL)
3386 CONNECTION_UNLOCK (connection);
3390 /* Assign a serial to the message */
3391 serial = dbus_message_get_serial (message);
3394 serial = _dbus_connection_get_next_client_serial (connection);
3395 dbus_message_set_serial (message, serial);
3398 if (!_dbus_pending_call_set_timeout_error_unlocked (pending, message, serial))
3401 /* Insert the serial in the pending replies hash;
3402 * hash takes a refcount on DBusPendingCall.
3403 * Also, add the timeout.
3405 if (!_dbus_connection_attach_pending_call_unlocked (connection,
3409 if (!_dbus_connection_send_unlocked_no_update (connection, message, NULL))
3411 _dbus_connection_detach_pending_call_and_unlock (connection,
3413 goto error_unlocked;
3417 *pending_return = pending; /* hand off refcount */
3420 _dbus_connection_detach_pending_call_unlocked (connection, pending);
3421 /* we still have a ref to the pending call in this case, we unref
3422 * after unlocking, below
3426 status = _dbus_connection_get_dispatch_status_unlocked (connection);
3428 /* this calls out to user code */
3429 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
3431 if (pending_return == NULL)
3432 dbus_pending_call_unref (pending);
3437 CONNECTION_UNLOCK (connection);
3439 dbus_pending_call_unref (pending);
3444 * Sends a message and blocks a certain time period while waiting for
3445 * a reply. This function does not reenter the main loop,
3446 * i.e. messages other than the reply are queued up but not
3447 * processed. This function is used to invoke method calls on a
3450 * If a normal reply is received, it is returned, and removed from the
3451 * incoming message queue. If it is not received, #NULL is returned
3452 * and the error is set to #DBUS_ERROR_NO_REPLY. If an error reply is
3453 * received, it is converted to a #DBusError and returned as an error,
3454 * then the reply message is deleted and #NULL is returned. If
3455 * something else goes wrong, result is set to whatever is
3456 * appropriate, such as #DBUS_ERROR_NO_MEMORY or
3457 * #DBUS_ERROR_DISCONNECTED.
3459 * @warning While this function blocks the calling thread will not be
3460 * processing the incoming message queue. This means you can end up
3461 * deadlocked if the application you're talking to needs you to reply
3462 * to a method. To solve this, either avoid the situation, block in a
3463 * separate thread from the main connection-dispatching thread, or use
3464 * dbus_pending_call_set_notify() to avoid blocking.
3466 * @param connection the connection
3467 * @param message the message to send
3468 * @param timeout_milliseconds timeout in milliseconds, -1 (or
3469 * #DBUS_TIMEOUT_USE_DEFAULT) for default or #DBUS_TIMEOUT_INFINITE for no
3471 * @param error return location for error message
3472 * @returns the message that is the reply or #NULL with an error code if the
3476 dbus_connection_send_with_reply_and_block (DBusConnection *connection,
3477 DBusMessage *message,
3478 int timeout_milliseconds,
3482 DBusPendingCall *pending;
3484 _dbus_return_val_if_fail (connection != NULL, NULL);
3485 _dbus_return_val_if_fail (message != NULL, NULL);
3486 _dbus_return_val_if_fail (timeout_milliseconds >= 0 || timeout_milliseconds == -1, NULL);
3487 _dbus_return_val_if_error_is_set (error, NULL);
3489 #ifdef HAVE_UNIX_FD_PASSING
3491 CONNECTION_LOCK (connection);
3492 if (!_dbus_transport_can_pass_unix_fd(connection->transport) &&
3493 message->n_unix_fds > 0)
3495 CONNECTION_UNLOCK (connection);
3496 dbus_set_error(error, DBUS_ERROR_FAILED, "Cannot send file descriptors on this connection.");
3499 CONNECTION_UNLOCK (connection);
3503 if (!dbus_connection_send_with_reply (connection, message,
3504 &pending, timeout_milliseconds))
3506 _DBUS_SET_OOM (error);
3510 if (pending == NULL)
3512 dbus_set_error (error, DBUS_ERROR_DISCONNECTED, "Connection is closed");
3516 dbus_pending_call_block (pending);
3518 reply = dbus_pending_call_steal_reply (pending);
3519 dbus_pending_call_unref (pending);
3521 /* call_complete_and_unlock() called from pending_call_block() should
3522 * always fill this in.
3524 _dbus_assert (reply != NULL);
3526 if (dbus_set_error_from_message (error, reply))
3528 dbus_message_unref (reply);
3536 * Blocks until the outgoing message queue is empty.
3537 * Assumes connection lock already held.
3539 * If you call this, you MUST call update_dispatch_status afterword...
3541 * @param connection the connection.
3543 static DBusDispatchStatus
3544 _dbus_connection_flush_unlocked (DBusConnection *connection)
3546 /* We have to specify DBUS_ITERATION_DO_READING here because
3547 * otherwise we could have two apps deadlock if they are both doing
3548 * a flush(), and the kernel buffers fill up. This could change the
3551 DBusDispatchStatus status;
3553 HAVE_LOCK_CHECK (connection);
3555 while (connection->n_outgoing > 0 &&
3556 _dbus_connection_get_is_connected_unlocked (connection))
3558 _dbus_verbose ("doing iteration in\n");
3559 HAVE_LOCK_CHECK (connection);
3560 _dbus_connection_do_iteration_unlocked (connection,
3562 DBUS_ITERATION_DO_READING |
3563 DBUS_ITERATION_DO_WRITING |
3564 DBUS_ITERATION_BLOCK,
3568 HAVE_LOCK_CHECK (connection);
3569 _dbus_verbose ("middle\n");
3570 status = _dbus_connection_get_dispatch_status_unlocked (connection);
3572 HAVE_LOCK_CHECK (connection);
3577 * Blocks until the outgoing message queue is empty.
3579 * @param connection the connection.
3582 dbus_connection_flush (DBusConnection *connection)
3584 /* We have to specify DBUS_ITERATION_DO_READING here because
3585 * otherwise we could have two apps deadlock if they are both doing
3586 * a flush(), and the kernel buffers fill up. This could change the
3589 DBusDispatchStatus status;
3591 _dbus_return_if_fail (connection != NULL);
3593 CONNECTION_LOCK (connection);
3595 status = _dbus_connection_flush_unlocked (connection);
3597 HAVE_LOCK_CHECK (connection);
3598 /* Unlocks and calls out to user code */
3599 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
3601 _dbus_verbose ("end\n");
3605 * This function implements dbus_connection_read_write_dispatch() and
3606 * dbus_connection_read_write() (they pass a different value for the
3607 * dispatch parameter).
3609 * @param connection the connection
3610 * @param timeout_milliseconds max time to block or -1 for infinite
3611 * @param dispatch dispatch new messages or leave them on the incoming queue
3612 * @returns #TRUE if the disconnect message has not been processed
3615 _dbus_connection_read_write_dispatch (DBusConnection *connection,
3616 int timeout_milliseconds,
3617 dbus_bool_t dispatch)
3619 DBusDispatchStatus dstatus;
3620 dbus_bool_t progress_possible;
3622 /* Need to grab a ref here in case we're a private connection and
3623 * the user drops the last ref in a handler we call; see bug
3624 * https://bugs.freedesktop.org/show_bug.cgi?id=15635
3626 dbus_connection_ref (connection);
3627 dstatus = dbus_connection_get_dispatch_status (connection);
3629 if (dispatch && dstatus == DBUS_DISPATCH_DATA_REMAINS)
3631 _dbus_verbose ("doing dispatch\n");
3632 dbus_connection_dispatch (connection);
3633 CONNECTION_LOCK (connection);
3635 else if (dstatus == DBUS_DISPATCH_NEED_MEMORY)
3637 _dbus_verbose ("pausing for memory\n");
3638 _dbus_memory_pause_based_on_timeout (timeout_milliseconds);
3639 CONNECTION_LOCK (connection);
3643 CONNECTION_LOCK (connection);
3644 if (_dbus_connection_get_is_connected_unlocked (connection))
3646 _dbus_verbose ("doing iteration\n");
3647 _dbus_connection_do_iteration_unlocked (connection,
3649 DBUS_ITERATION_DO_READING |
3650 DBUS_ITERATION_DO_WRITING |
3651 DBUS_ITERATION_BLOCK,
3652 timeout_milliseconds);
3656 HAVE_LOCK_CHECK (connection);
3657 /* If we can dispatch, we can make progress until the Disconnected message
3658 * has been processed; if we can only read/write, we can make progress
3659 * as long as the transport is open.
3662 progress_possible = connection->n_incoming != 0 ||
3663 connection->disconnect_message_link != NULL;
3665 progress_possible = _dbus_connection_get_is_connected_unlocked (connection);
3667 CONNECTION_UNLOCK (connection);
3669 dbus_connection_unref (connection);
3671 return progress_possible; /* TRUE if we can make more progress */
3676 * This function is intended for use with applications that don't want
3677 * to write a main loop and deal with #DBusWatch and #DBusTimeout. An
3678 * example usage would be:
3681 * while (dbus_connection_read_write_dispatch (connection, -1))
3682 * ; // empty loop body
3685 * In this usage you would normally have set up a filter function to look
3686 * at each message as it is dispatched. The loop terminates when the last
3687 * message from the connection (the disconnected signal) is processed.
3689 * If there are messages to dispatch, this function will
3690 * dbus_connection_dispatch() once, and return. If there are no
3691 * messages to dispatch, this function will block until it can read or
3692 * write, then read or write, then return.
3694 * The way to think of this function is that it either makes some sort
3695 * of progress, or it blocks. Note that, while it is blocked on I/O, it
3696 * cannot be interrupted (even by other threads), which makes this function
3697 * unsuitable for applications that do more than just react to received
3700 * The return value indicates whether the disconnect message has been
3701 * processed, NOT whether the connection is connected. This is
3702 * important because even after disconnecting, you want to process any
3703 * messages you received prior to the disconnect.
3705 * @param connection the connection
3706 * @param timeout_milliseconds max time to block or -1 for infinite
3707 * @returns #TRUE if the disconnect message has not been processed
3710 dbus_connection_read_write_dispatch (DBusConnection *connection,
3711 int timeout_milliseconds)
3713 _dbus_return_val_if_fail (connection != NULL, FALSE);
3714 _dbus_return_val_if_fail (timeout_milliseconds >= 0 || timeout_milliseconds == -1, FALSE);
3715 return _dbus_connection_read_write_dispatch(connection, timeout_milliseconds, TRUE);
3719 * This function is intended for use with applications that don't want to
3720 * write a main loop and deal with #DBusWatch and #DBusTimeout. See also
3721 * dbus_connection_read_write_dispatch().
3723 * As long as the connection is open, this function will block until it can
3724 * read or write, then read or write, then return #TRUE.
3726 * If the connection is closed, the function returns #FALSE.
3728 * The return value indicates whether reading or writing is still
3729 * possible, i.e. whether the connection is connected.
3731 * Note that even after disconnection, messages may remain in the
3732 * incoming queue that need to be
3733 * processed. dbus_connection_read_write_dispatch() dispatches
3734 * incoming messages for you; with dbus_connection_read_write() you
3735 * have to arrange to drain the incoming queue yourself.
3737 * @param connection the connection
3738 * @param timeout_milliseconds max time to block or -1 for infinite
3739 * @returns #TRUE if still connected
3742 dbus_connection_read_write (DBusConnection *connection,
3743 int timeout_milliseconds)
3745 _dbus_return_val_if_fail (connection != NULL, FALSE);
3746 _dbus_return_val_if_fail (timeout_milliseconds >= 0 || timeout_milliseconds == -1, FALSE);
3747 return _dbus_connection_read_write_dispatch(connection, timeout_milliseconds, FALSE);
3750 /* We need to call this anytime we pop the head of the queue, and then
3751 * update_dispatch_status_and_unlock needs to be called afterward
3752 * which will "process" the disconnected message and set
3753 * disconnected_message_processed.
3756 check_disconnected_message_arrived_unlocked (DBusConnection *connection,
3757 DBusMessage *head_of_queue)
3759 HAVE_LOCK_CHECK (connection);
3761 /* checking that the link is NULL is an optimization to avoid the is_signal call */
3762 if (connection->disconnect_message_link == NULL &&
3763 dbus_message_is_signal (head_of_queue,
3764 DBUS_INTERFACE_LOCAL,
3767 connection->disconnected_message_arrived = TRUE;
3772 * Returns the first-received message from the incoming message queue,
3773 * leaving it in the queue. If the queue is empty, returns #NULL.
3775 * The caller does not own a reference to the returned message, and
3776 * must either return it using dbus_connection_return_message() or
3777 * keep it after calling dbus_connection_steal_borrowed_message(). No
3778 * one can get at the message while its borrowed, so return it as
3779 * quickly as possible and don't keep a reference to it after
3780 * returning it. If you need to keep the message, make a copy of it.
3782 * dbus_connection_dispatch() will block if called while a borrowed
3783 * message is outstanding; only one piece of code can be playing with
3784 * the incoming queue at a time. This function will block if called
3785 * during a dbus_connection_dispatch().
3787 * @param connection the connection.
3788 * @returns next message in the incoming queue.
3791 dbus_connection_borrow_message (DBusConnection *connection)
3793 DBusDispatchStatus status;
3794 DBusMessage *message;
3796 _dbus_return_val_if_fail (connection != NULL, NULL);
3798 _dbus_verbose ("start\n");
3800 /* this is called for the side effect that it queues
3801 * up any messages from the transport
3803 status = dbus_connection_get_dispatch_status (connection);
3804 if (status != DBUS_DISPATCH_DATA_REMAINS)
3807 CONNECTION_LOCK (connection);
3809 _dbus_connection_acquire_dispatch (connection);
3811 /* While a message is outstanding, the dispatch lock is held */
3812 _dbus_assert (connection->message_borrowed == NULL);
3814 connection->message_borrowed = _dbus_list_get_first (&connection->incoming_messages);
3816 message = connection->message_borrowed;
3818 check_disconnected_message_arrived_unlocked (connection, message);
3820 /* Note that we KEEP the dispatch lock until the message is returned */
3821 if (message == NULL)
3822 _dbus_connection_release_dispatch (connection);
3824 CONNECTION_UNLOCK (connection);
3826 /* We don't update dispatch status until it's returned or stolen */
3832 * Used to return a message after peeking at it using
3833 * dbus_connection_borrow_message(). Only called if
3834 * message from dbus_connection_borrow_message() was non-#NULL.
3836 * @param connection the connection
3837 * @param message the message from dbus_connection_borrow_message()
3840 dbus_connection_return_message (DBusConnection *connection,
3841 DBusMessage *message)
3843 DBusDispatchStatus status;
3845 _dbus_return_if_fail (connection != NULL);
3846 _dbus_return_if_fail (message != NULL);
3847 _dbus_return_if_fail (message == connection->message_borrowed);
3848 _dbus_return_if_fail (connection->dispatch_acquired);
3850 CONNECTION_LOCK (connection);
3852 _dbus_assert (message == connection->message_borrowed);
3854 connection->message_borrowed = NULL;
3856 _dbus_connection_release_dispatch (connection);
3858 status = _dbus_connection_get_dispatch_status_unlocked (connection);
3859 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
3863 * Used to keep a message after peeking at it using
3864 * dbus_connection_borrow_message(). Before using this function, see
3865 * the caveats/warnings in the documentation for
3866 * dbus_connection_pop_message().
3868 * @param connection the connection
3869 * @param message the message from dbus_connection_borrow_message()
3872 dbus_connection_steal_borrowed_message (DBusConnection *connection,
3873 DBusMessage *message)
3875 DBusMessage *pop_message;
3876 DBusDispatchStatus status;
3878 _dbus_return_if_fail (connection != NULL);
3879 _dbus_return_if_fail (message != NULL);
3880 _dbus_return_if_fail (message == connection->message_borrowed);
3881 _dbus_return_if_fail (connection->dispatch_acquired);
3883 CONNECTION_LOCK (connection);
3885 _dbus_assert (message == connection->message_borrowed);
3887 pop_message = _dbus_list_pop_first (&connection->incoming_messages);
3888 _dbus_assert (message == pop_message);
3890 connection->n_incoming -= 1;
3892 _dbus_verbose ("Incoming message %p stolen from queue, %d incoming\n",
3893 message, connection->n_incoming);
3895 connection->message_borrowed = NULL;
3897 _dbus_connection_release_dispatch (connection);
3899 status = _dbus_connection_get_dispatch_status_unlocked (connection);
3900 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
3903 /* See dbus_connection_pop_message, but requires the caller to own
3904 * the lock before calling. May drop the lock while running.
3907 _dbus_connection_pop_message_link_unlocked (DBusConnection *connection)
3909 HAVE_LOCK_CHECK (connection);
3911 _dbus_assert (connection->message_borrowed == NULL);
3913 if (connection->n_incoming > 0)
3917 link = _dbus_list_pop_first_link (&connection->incoming_messages);
3918 connection->n_incoming -= 1;
3920 _dbus_verbose ("Message %p (%s %s %s %s '%s') removed from incoming queue %p, %d incoming\n",
3922 dbus_message_type_to_string (dbus_message_get_type (link->data)),
3923 dbus_message_get_path (link->data) ?
3924 dbus_message_get_path (link->data) :
3926 dbus_message_get_interface (link->data) ?
3927 dbus_message_get_interface (link->data) :
3929 dbus_message_get_member (link->data) ?
3930 dbus_message_get_member (link->data) :
3932 dbus_message_get_signature (link->data),
3933 connection, connection->n_incoming);
3935 check_disconnected_message_arrived_unlocked (connection, link->data);
3943 /* See dbus_connection_pop_message, but requires the caller to own
3944 * the lock before calling. May drop the lock while running.
3947 _dbus_connection_pop_message_unlocked (DBusConnection *connection)
3951 HAVE_LOCK_CHECK (connection);
3953 link = _dbus_connection_pop_message_link_unlocked (connection);
3957 DBusMessage *message;
3959 message = link->data;
3961 _dbus_list_free_link (link);
3970 _dbus_connection_putback_message_link_unlocked (DBusConnection *connection,
3971 DBusList *message_link)
3973 HAVE_LOCK_CHECK (connection);
3975 _dbus_assert (message_link != NULL);
3976 /* You can't borrow a message while a link is outstanding */
3977 _dbus_assert (connection->message_borrowed == NULL);
3978 /* We had to have the dispatch lock across the pop/putback */
3979 _dbus_assert (connection->dispatch_acquired);
3981 _dbus_list_prepend_link (&connection->incoming_messages,
3983 connection->n_incoming += 1;
3985 _dbus_verbose ("Message %p (%s %s %s '%s') put back into queue %p, %d incoming\n",
3987 dbus_message_type_to_string (dbus_message_get_type (message_link->data)),
3988 dbus_message_get_interface (message_link->data) ?
3989 dbus_message_get_interface (message_link->data) :
3991 dbus_message_get_member (message_link->data) ?
3992 dbus_message_get_member (message_link->data) :
3994 dbus_message_get_signature (message_link->data),
3995 connection, connection->n_incoming);
3999 * Returns the first-received message from the incoming message queue,
4000 * removing it from the queue. The caller owns a reference to the
4001 * returned message. If the queue is empty, returns #NULL.
4003 * This function bypasses any message handlers that are registered,
4004 * and so using it is usually wrong. Instead, let the main loop invoke
4005 * dbus_connection_dispatch(). Popping messages manually is only
4006 * useful in very simple programs that don't share a #DBusConnection
4007 * with any libraries or other modules.
4009 * There is a lock that covers all ways of accessing the incoming message
4010 * queue, so dbus_connection_dispatch(), dbus_connection_pop_message(),
4011 * dbus_connection_borrow_message(), etc. will all block while one of the others
4012 * in the group is running.
4014 * @param connection the connection.
4015 * @returns next message in the incoming queue.
4018 dbus_connection_pop_message (DBusConnection *connection)
4020 DBusMessage *message;
4021 DBusDispatchStatus status;
4023 _dbus_verbose ("start\n");
4025 /* this is called for the side effect that it queues
4026 * up any messages from the transport
4028 status = dbus_connection_get_dispatch_status (connection);
4029 if (status != DBUS_DISPATCH_DATA_REMAINS)
4032 CONNECTION_LOCK (connection);
4033 _dbus_connection_acquire_dispatch (connection);
4034 HAVE_LOCK_CHECK (connection);
4036 message = _dbus_connection_pop_message_unlocked (connection);
4038 _dbus_verbose ("Returning popped message %p\n", message);
4040 _dbus_connection_release_dispatch (connection);
4042 status = _dbus_connection_get_dispatch_status_unlocked (connection);
4043 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
4049 * Acquire the dispatcher. This is a separate lock so the main
4050 * connection lock can be dropped to call out to application dispatch
4053 * @param connection the connection.
4056 _dbus_connection_acquire_dispatch (DBusConnection *connection)
4058 HAVE_LOCK_CHECK (connection);
4060 _dbus_connection_ref_unlocked (connection);
4061 CONNECTION_UNLOCK (connection);
4063 _dbus_verbose ("locking dispatch_mutex\n");
4064 _dbus_mutex_lock (connection->dispatch_mutex);
4066 while (connection->dispatch_acquired)
4068 _dbus_verbose ("waiting for dispatch to be acquirable\n");
4069 _dbus_condvar_wait (connection->dispatch_cond,
4070 connection->dispatch_mutex);
4073 _dbus_assert (!connection->dispatch_acquired);
4075 connection->dispatch_acquired = TRUE;
4077 _dbus_verbose ("unlocking dispatch_mutex\n");
4078 _dbus_mutex_unlock (connection->dispatch_mutex);
4080 CONNECTION_LOCK (connection);
4081 _dbus_connection_unref_unlocked (connection);
4085 * Release the dispatcher when you're done with it. Only call
4086 * after you've acquired the dispatcher. Wakes up at most one
4087 * thread currently waiting to acquire the dispatcher.
4089 * @param connection the connection.
4092 _dbus_connection_release_dispatch (DBusConnection *connection)
4094 HAVE_LOCK_CHECK (connection);
4096 _dbus_verbose ("locking dispatch_mutex\n");
4097 _dbus_mutex_lock (connection->dispatch_mutex);
4099 _dbus_assert (connection->dispatch_acquired);
4101 connection->dispatch_acquired = FALSE;
4102 _dbus_condvar_wake_one (connection->dispatch_cond);
4104 _dbus_verbose ("unlocking dispatch_mutex\n");
4105 _dbus_mutex_unlock (connection->dispatch_mutex);
4109 _dbus_connection_failed_pop (DBusConnection *connection,
4110 DBusList *message_link)
4112 _dbus_list_prepend_link (&connection->incoming_messages,
4114 connection->n_incoming += 1;
4117 /* Note this may be called multiple times since we don't track whether we already did it */
4119 notify_disconnected_unlocked (DBusConnection *connection)
4121 HAVE_LOCK_CHECK (connection);
4123 /* Set the weakref in dbus-bus.c to NULL, so nobody will get a disconnected
4124 * connection from dbus_bus_get(). We make the same guarantee for
4125 * dbus_connection_open() but in a different way since we don't want to
4126 * unref right here; we instead check for connectedness before returning
4127 * the connection from the hash.
4129 _dbus_bus_notify_shared_connection_disconnected_unlocked (connection);
4131 /* Dump the outgoing queue, we aren't going to be able to
4132 * send it now, and we'd like accessors like
4133 * dbus_connection_get_outgoing_size() to be accurate.
4135 if (connection->n_outgoing > 0)
4139 _dbus_verbose ("Dropping %d outgoing messages since we're disconnected\n",
4140 connection->n_outgoing);
4142 while ((link = _dbus_list_get_last_link (&connection->outgoing_messages)))
4144 _dbus_connection_message_sent_unlocked (connection, link->data);
4149 /* Note this may be called multiple times since we don't track whether we already did it */
4150 static DBusDispatchStatus
4151 notify_disconnected_and_dispatch_complete_unlocked (DBusConnection *connection)
4153 HAVE_LOCK_CHECK (connection);
4155 if (connection->disconnect_message_link != NULL)
4157 _dbus_verbose ("Sending disconnect message\n");
4159 /* If we have pending calls, queue their timeouts - we want the Disconnected
4160 * to be the last message, after these timeouts.
4162 connection_timeout_and_complete_all_pending_calls_unlocked (connection);
4164 /* We haven't sent the disconnect message already,
4165 * and all real messages have been queued up.
4167 _dbus_connection_queue_synthesized_message_link (connection,
4168 connection->disconnect_message_link);
4169 connection->disconnect_message_link = NULL;
4171 return DBUS_DISPATCH_DATA_REMAINS;
4174 return DBUS_DISPATCH_COMPLETE;
4177 static DBusDispatchStatus
4178 _dbus_connection_get_dispatch_status_unlocked (DBusConnection *connection)
4180 HAVE_LOCK_CHECK (connection);
4182 if (connection->n_incoming > 0)
4183 return DBUS_DISPATCH_DATA_REMAINS;
4184 else if (!_dbus_transport_queue_messages (connection->transport))
4185 return DBUS_DISPATCH_NEED_MEMORY;
4188 DBusDispatchStatus status;
4189 dbus_bool_t is_connected;
4191 status = _dbus_transport_get_dispatch_status (connection->transport);
4192 is_connected = _dbus_transport_get_is_connected (connection->transport);
4194 _dbus_verbose ("dispatch status = %s is_connected = %d\n",
4195 DISPATCH_STATUS_NAME (status), is_connected);
4199 /* It's possible this would be better done by having an explicit
4200 * notification from _dbus_transport_disconnect() that would
4201 * synchronously do this, instead of waiting for the next dispatch
4202 * status check. However, probably not good to change until it causes
4205 notify_disconnected_unlocked (connection);
4207 /* I'm not sure this is needed; the idea is that we want to
4208 * queue the Disconnected only after we've read all the
4209 * messages, but if we're disconnected maybe we are guaranteed
4210 * to have read them all ?
4212 if (status == DBUS_DISPATCH_COMPLETE)
4213 status = notify_disconnected_and_dispatch_complete_unlocked (connection);
4216 if (status != DBUS_DISPATCH_COMPLETE)
4218 else if (connection->n_incoming > 0)
4219 return DBUS_DISPATCH_DATA_REMAINS;
4221 return DBUS_DISPATCH_COMPLETE;
4226 _dbus_connection_update_dispatch_status_and_unlock (DBusConnection *connection,
4227 DBusDispatchStatus new_status)
4229 dbus_bool_t changed;
4230 DBusDispatchStatusFunction function;
4233 HAVE_LOCK_CHECK (connection);
4235 _dbus_connection_ref_unlocked (connection);
4237 changed = new_status != connection->last_dispatch_status;
4239 connection->last_dispatch_status = new_status;
4241 function = connection->dispatch_status_function;
4242 data = connection->dispatch_status_data;
4244 if (connection->disconnected_message_arrived &&
4245 !connection->disconnected_message_processed)
4247 connection->disconnected_message_processed = TRUE;
4249 /* this does an unref, but we have a ref
4250 * so we should not run the finalizer here
4253 connection_forget_shared_unlocked (connection);
4255 if (connection->exit_on_disconnect)
4257 CONNECTION_UNLOCK (connection);
4259 _dbus_verbose ("Exiting on Disconnected signal\n");
4261 _dbus_assert_not_reached ("Call to exit() returned");
4265 /* We drop the lock */
4266 CONNECTION_UNLOCK (connection);
4268 if (changed && function)
4270 _dbus_verbose ("Notifying of change to dispatch status of %p now %d (%s)\n",
4271 connection, new_status,
4272 DISPATCH_STATUS_NAME (new_status));
4273 (* function) (connection, new_status, data);
4276 dbus_connection_unref (connection);
4280 * Gets the current state of the incoming message queue.
4281 * #DBUS_DISPATCH_DATA_REMAINS indicates that the message queue
4282 * may contain messages. #DBUS_DISPATCH_COMPLETE indicates that the
4283 * incoming queue is empty. #DBUS_DISPATCH_NEED_MEMORY indicates that
4284 * there could be data, but we can't know for sure without more
4287 * To process the incoming message queue, use dbus_connection_dispatch()
4288 * or (in rare cases) dbus_connection_pop_message().
4290 * Note, #DBUS_DISPATCH_DATA_REMAINS really means that either we
4291 * have messages in the queue, or we have raw bytes buffered up
4292 * that need to be parsed. When these bytes are parsed, they
4293 * may not add up to an entire message. Thus, it's possible
4294 * to see a status of #DBUS_DISPATCH_DATA_REMAINS but not
4295 * have a message yet.
4297 * In particular this happens on initial connection, because all sorts
4298 * of authentication protocol stuff has to be parsed before the
4299 * first message arrives.
4301 * @param connection the connection.
4302 * @returns current dispatch status
4305 dbus_connection_get_dispatch_status (DBusConnection *connection)
4307 DBusDispatchStatus status;
4309 _dbus_return_val_if_fail (connection != NULL, DBUS_DISPATCH_COMPLETE);
4311 _dbus_verbose ("start\n");
4313 CONNECTION_LOCK (connection);
4315 status = _dbus_connection_get_dispatch_status_unlocked (connection);
4317 CONNECTION_UNLOCK (connection);
4323 * Filter funtion for handling the Peer standard interface.
4325 static DBusHandlerResult
4326 _dbus_connection_peer_filter_unlocked_no_update (DBusConnection *connection,
4327 DBusMessage *message)
4329 dbus_bool_t sent = FALSE;
4330 DBusMessage *ret = NULL;
4331 DBusList *expire_link;
4333 if (connection->route_peer_messages && dbus_message_get_destination (message) != NULL)
4335 /* This means we're letting the bus route this message */
4336 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
4339 if (!dbus_message_has_interface (message, DBUS_INTERFACE_PEER))
4341 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
4344 /* Preallocate a linked-list link, so that if we need to dispose of a
4345 * message, we can attach it to the expired list */
4346 expire_link = _dbus_list_alloc_link (NULL);
4349 return DBUS_HANDLER_RESULT_NEED_MEMORY;
4351 if (dbus_message_is_method_call (message,
4352 DBUS_INTERFACE_PEER,
4355 ret = dbus_message_new_method_return (message);
4359 sent = _dbus_connection_send_unlocked_no_update (connection, ret, NULL);
4361 else if (dbus_message_is_method_call (message,
4362 DBUS_INTERFACE_PEER,
4367 ret = dbus_message_new_method_return (message);
4371 _dbus_string_init (&uuid);
4372 if (_dbus_get_local_machine_uuid_encoded (&uuid))
4374 const char *v_STRING = _dbus_string_get_const_data (&uuid);
4375 if (dbus_message_append_args (ret,
4376 DBUS_TYPE_STRING, &v_STRING,
4379 sent = _dbus_connection_send_unlocked_no_update (connection, ret, NULL);
4382 _dbus_string_free (&uuid);
4386 /* We need to bounce anything else with this interface, otherwise apps
4387 * could start extending the interface and when we added extensions
4388 * here to DBusConnection we'd break those apps.
4390 ret = dbus_message_new_error (message,
4391 DBUS_ERROR_UNKNOWN_METHOD,
4392 "Unknown method invoked on org.freedesktop.DBus.Peer interface");
4396 sent = _dbus_connection_send_unlocked_no_update (connection, ret, NULL);
4402 _dbus_list_free_link (expire_link);
4406 /* It'll be safe to unref the reply when we unlock */
4407 expire_link->data = ret;
4408 _dbus_list_prepend_link (&connection->expired_messages, expire_link);
4412 return DBUS_HANDLER_RESULT_NEED_MEMORY;
4414 return DBUS_HANDLER_RESULT_HANDLED;
4418 * Processes all builtin filter functions
4420 * If the spec specifies a standard interface
4421 * they should be processed from this method
4423 static DBusHandlerResult
4424 _dbus_connection_run_builtin_filters_unlocked_no_update (DBusConnection *connection,
4425 DBusMessage *message)
4427 /* We just run one filter for now but have the option to run more
4428 if the spec calls for it in the future */
4430 return _dbus_connection_peer_filter_unlocked_no_update (connection, message);
4434 * Processes any incoming data.
4436 * If there's incoming raw data that has not yet been parsed, it is
4437 * parsed, which may or may not result in adding messages to the
4440 * The incoming data buffer is filled when the connection reads from
4441 * its underlying transport (such as a socket). Reading usually
4442 * happens in dbus_watch_handle() or dbus_connection_read_write().
4444 * If there are complete messages in the incoming queue,
4445 * dbus_connection_dispatch() removes one message from the queue and
4446 * processes it. Processing has three steps.
4448 * First, any method replies are passed to #DBusPendingCall or
4449 * dbus_connection_send_with_reply_and_block() in order to
4450 * complete the pending method call.
4452 * Second, any filters registered with dbus_connection_add_filter()
4453 * are run. If any filter returns #DBUS_HANDLER_RESULT_HANDLED
4454 * then processing stops after that filter.
4456 * Third, if the message is a method call it is forwarded to
4457 * any registered object path handlers added with
4458 * dbus_connection_register_object_path() or
4459 * dbus_connection_register_fallback().
4461 * A single call to dbus_connection_dispatch() will process at most
4462 * one message; it will not clear the entire message queue.
4464 * Be careful about calling dbus_connection_dispatch() from inside a
4465 * message handler, i.e. calling dbus_connection_dispatch()
4466 * recursively. If threads have been initialized with a recursive
4467 * mutex function, then this will not deadlock; however, it can
4468 * certainly confuse your application.
4470 * @todo some FIXME in here about handling DBUS_HANDLER_RESULT_NEED_MEMORY
4472 * @param connection the connection
4473 * @returns dispatch status, see dbus_connection_get_dispatch_status()
4476 dbus_connection_dispatch (DBusConnection *connection)
4478 DBusMessage *message;
4479 DBusList *link, *filter_list_copy, *message_link;
4480 DBusHandlerResult result;
4481 DBusPendingCall *pending;
4482 dbus_int32_t reply_serial;
4483 DBusDispatchStatus status;
4484 dbus_bool_t found_object;
4486 _dbus_return_val_if_fail (connection != NULL, DBUS_DISPATCH_COMPLETE);
4488 _dbus_verbose ("\n");
4490 CONNECTION_LOCK (connection);
4491 status = _dbus_connection_get_dispatch_status_unlocked (connection);
4492 if (status != DBUS_DISPATCH_DATA_REMAINS)
4494 /* unlocks and calls out to user code */
4495 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
4499 /* We need to ref the connection since the callback could potentially
4500 * drop the last ref to it
4502 _dbus_connection_ref_unlocked (connection);
4504 _dbus_connection_acquire_dispatch (connection);
4505 HAVE_LOCK_CHECK (connection);
4507 message_link = _dbus_connection_pop_message_link_unlocked (connection);
4508 if (message_link == NULL)
4510 /* another thread dispatched our stuff */
4512 _dbus_verbose ("another thread dispatched message (during acquire_dispatch above)\n");
4514 _dbus_connection_release_dispatch (connection);
4516 status = _dbus_connection_get_dispatch_status_unlocked (connection);
4518 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
4520 dbus_connection_unref (connection);
4525 message = message_link->data;
4527 _dbus_verbose (" dispatching message %p (%s %s %s '%s')\n",
4529 dbus_message_type_to_string (dbus_message_get_type (message)),
4530 dbus_message_get_interface (message) ?
4531 dbus_message_get_interface (message) :
4533 dbus_message_get_member (message) ?
4534 dbus_message_get_member (message) :
4536 dbus_message_get_signature (message));
4538 result = DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
4540 /* Pending call handling must be first, because if you do
4541 * dbus_connection_send_with_reply_and_block() or
4542 * dbus_pending_call_block() then no handlers/filters will be run on
4543 * the reply. We want consistent semantics in the case where we
4544 * dbus_connection_dispatch() the reply.
4547 reply_serial = dbus_message_get_reply_serial (message);
4548 pending = _dbus_hash_table_lookup_int (connection->pending_replies,
4552 _dbus_verbose ("Dispatching a pending reply\n");
4553 complete_pending_call_and_unlock (connection, pending, message);
4554 pending = NULL; /* it's probably unref'd */
4556 CONNECTION_LOCK (connection);
4557 _dbus_verbose ("pending call completed in dispatch\n");
4558 result = DBUS_HANDLER_RESULT_HANDLED;
4562 result = _dbus_connection_run_builtin_filters_unlocked_no_update (connection, message);
4563 if (result != DBUS_HANDLER_RESULT_NOT_YET_HANDLED)
4566 if (!_dbus_list_copy (&connection->filter_list, &filter_list_copy))
4568 _dbus_connection_release_dispatch (connection);
4569 HAVE_LOCK_CHECK (connection);
4571 _dbus_connection_failed_pop (connection, message_link);
4573 /* unlocks and calls user code */
4574 _dbus_connection_update_dispatch_status_and_unlock (connection,
4575 DBUS_DISPATCH_NEED_MEMORY);
4576 dbus_connection_unref (connection);
4578 return DBUS_DISPATCH_NEED_MEMORY;
4581 _dbus_list_foreach (&filter_list_copy,
4582 (DBusForeachFunction)_dbus_message_filter_ref,
4585 /* We're still protected from dispatch() reentrancy here
4586 * since we acquired the dispatcher
4588 CONNECTION_UNLOCK (connection);
4590 link = _dbus_list_get_first_link (&filter_list_copy);
4591 while (link != NULL)
4593 DBusMessageFilter *filter = link->data;
4594 DBusList *next = _dbus_list_get_next_link (&filter_list_copy, link);
4596 if (filter->function == NULL)
4598 _dbus_verbose (" filter was removed in a callback function\n");
4603 _dbus_verbose (" running filter on message %p\n", message);
4604 result = (* filter->function) (connection, message, filter->user_data);
4606 if (result != DBUS_HANDLER_RESULT_NOT_YET_HANDLED)
4612 _dbus_list_foreach (&filter_list_copy,
4613 (DBusForeachFunction)_dbus_message_filter_unref,
4615 _dbus_list_clear (&filter_list_copy);
4617 CONNECTION_LOCK (connection);
4619 if (result == DBUS_HANDLER_RESULT_NEED_MEMORY)
4621 _dbus_verbose ("No memory\n");
4624 else if (result == DBUS_HANDLER_RESULT_HANDLED)
4626 _dbus_verbose ("filter handled message in dispatch\n");
4630 /* We're still protected from dispatch() reentrancy here
4631 * since we acquired the dispatcher
4633 _dbus_verbose (" running object path dispatch on message %p (%s %s %s '%s')\n",
4635 dbus_message_type_to_string (dbus_message_get_type (message)),
4636 dbus_message_get_interface (message) ?
4637 dbus_message_get_interface (message) :
4639 dbus_message_get_member (message) ?
4640 dbus_message_get_member (message) :
4642 dbus_message_get_signature (message));
4644 HAVE_LOCK_CHECK (connection);
4645 result = _dbus_object_tree_dispatch_and_unlock (connection->objects,
4649 CONNECTION_LOCK (connection);
4651 if (result != DBUS_HANDLER_RESULT_NOT_YET_HANDLED)
4653 _dbus_verbose ("object tree handled message in dispatch\n");
4657 if (dbus_message_get_type (message) == DBUS_MESSAGE_TYPE_METHOD_CALL)
4661 DBusPreallocatedSend *preallocated;
4662 DBusList *expire_link;
4664 _dbus_verbose (" sending error %s\n",
4665 DBUS_ERROR_UNKNOWN_METHOD);
4667 if (!_dbus_string_init (&str))
4669 result = DBUS_HANDLER_RESULT_NEED_MEMORY;
4670 _dbus_verbose ("no memory for error string in dispatch\n");
4674 if (!_dbus_string_append_printf (&str,
4675 "Method \"%s\" with signature \"%s\" on interface \"%s\" doesn't exist\n",
4676 dbus_message_get_member (message),
4677 dbus_message_get_signature (message),
4678 dbus_message_get_interface (message)))
4680 _dbus_string_free (&str);
4681 result = DBUS_HANDLER_RESULT_NEED_MEMORY;
4682 _dbus_verbose ("no memory for error string in dispatch\n");
4686 reply = dbus_message_new_error (message,
4687 found_object ? DBUS_ERROR_UNKNOWN_METHOD : DBUS_ERROR_UNKNOWN_OBJECT,
4688 _dbus_string_get_const_data (&str));
4689 _dbus_string_free (&str);
4693 result = DBUS_HANDLER_RESULT_NEED_MEMORY;
4694 _dbus_verbose ("no memory for error reply in dispatch\n");
4698 expire_link = _dbus_list_alloc_link (reply);
4700 if (expire_link == NULL)
4702 dbus_message_unref (reply);
4703 result = DBUS_HANDLER_RESULT_NEED_MEMORY;
4704 _dbus_verbose ("no memory for error send in dispatch\n");
4708 preallocated = _dbus_connection_preallocate_send_unlocked (connection);
4710 if (preallocated == NULL)
4712 _dbus_list_free_link (expire_link);
4713 /* It's OK that this is finalized, because it hasn't been seen by
4714 * anything that could attach user callbacks */
4715 dbus_message_unref (reply);
4716 result = DBUS_HANDLER_RESULT_NEED_MEMORY;
4717 _dbus_verbose ("no memory for error send in dispatch\n");
4721 _dbus_connection_send_preallocated_unlocked_no_update (connection, preallocated,
4723 /* reply will be freed when we release the lock */
4724 _dbus_list_prepend_link (&connection->expired_messages, expire_link);
4726 result = DBUS_HANDLER_RESULT_HANDLED;
4729 _dbus_verbose (" done dispatching %p (%s %s %s '%s') on connection %p\n", message,
4730 dbus_message_type_to_string (dbus_message_get_type (message)),
4731 dbus_message_get_interface (message) ?
4732 dbus_message_get_interface (message) :
4734 dbus_message_get_member (message) ?
4735 dbus_message_get_member (message) :
4737 dbus_message_get_signature (message),
4741 if (result == DBUS_HANDLER_RESULT_NEED_MEMORY)
4743 _dbus_verbose ("out of memory\n");
4745 /* Put message back, and we'll start over.
4746 * Yes this means handlers must be idempotent if they
4747 * don't return HANDLED; c'est la vie.
4749 _dbus_connection_putback_message_link_unlocked (connection,
4751 /* now we don't want to free them */
4752 message_link = NULL;
4757 _dbus_verbose (" ... done dispatching\n");
4760 _dbus_connection_release_dispatch (connection);
4761 HAVE_LOCK_CHECK (connection);
4763 if (message != NULL)
4765 /* We don't want this message to count in maximum message limits when
4766 * computing the dispatch status, below. We have to drop the lock
4767 * temporarily, because finalizing a message can trigger callbacks.
4769 * We have a reference to the connection, and we don't use any cached
4770 * pointers to the connection's internals below this point, so it should
4771 * be safe to drop the lock and take it back. */
4772 CONNECTION_UNLOCK (connection);
4773 dbus_message_unref (message);
4774 CONNECTION_LOCK (connection);
4777 if (message_link != NULL)
4778 _dbus_list_free_link (message_link);
4780 _dbus_verbose ("before final status update\n");
4781 status = _dbus_connection_get_dispatch_status_unlocked (connection);
4783 /* unlocks and calls user code */
4784 _dbus_connection_update_dispatch_status_and_unlock (connection, status);
4786 dbus_connection_unref (connection);
4792 * Sets the watch functions for the connection. These functions are
4793 * responsible for making the application's main loop aware of file
4794 * descriptors that need to be monitored for events, using select() or
4795 * poll(). When using Qt, typically the DBusAddWatchFunction would
4796 * create a QSocketNotifier. When using GLib, the DBusAddWatchFunction
4797 * could call g_io_add_watch(), or could be used as part of a more
4798 * elaborate GSource. Note that when a watch is added, it may
4801 * The DBusWatchToggledFunction notifies the application that the
4802 * watch has been enabled or disabled. Call dbus_watch_get_enabled()
4803 * to check this. A disabled watch should have no effect, and enabled
4804 * watch should be added to the main loop. This feature is used
4805 * instead of simply adding/removing the watch because
4806 * enabling/disabling can be done without memory allocation. The
4807 * toggled function may be NULL if a main loop re-queries
4808 * dbus_watch_get_enabled() every time anyway.
4810 * The DBusWatch can be queried for the file descriptor to watch using
4811 * dbus_watch_get_unix_fd() or dbus_watch_get_socket(), and for the
4812 * events to watch for using dbus_watch_get_flags(). The flags
4813 * returned by dbus_watch_get_flags() will only contain
4814 * DBUS_WATCH_READABLE and DBUS_WATCH_WRITABLE, never
4815 * DBUS_WATCH_HANGUP or DBUS_WATCH_ERROR; all watches implicitly
4816 * include a watch for hangups, errors, and other exceptional
4819 * Once a file descriptor becomes readable or writable, or an exception
4820 * occurs, dbus_watch_handle() should be called to
4821 * notify the connection of the file descriptor's condition.
4823 * dbus_watch_handle() cannot be called during the
4824 * DBusAddWatchFunction, as the connection will not be ready to handle
4827 * It is not allowed to reference a DBusWatch after it has been passed
4828 * to remove_function.
4830 * If #FALSE is returned due to lack of memory, the failure may be due
4831 * to a #FALSE return from the new add_function. If so, the
4832 * add_function may have been called successfully one or more times,
4833 * but the remove_function will also have been called to remove any
4834 * successful adds. i.e. if #FALSE is returned the net result
4835 * should be that dbus_connection_set_watch_functions() has no effect,
4836 * but the add_function and remove_function may have been called.
4838 * @note The thread lock on DBusConnection is held while
4839 * watch functions are invoked, so inside these functions you
4840 * may not invoke any methods on DBusConnection or it will deadlock.
4841 * See the comments in the code or http://lists.freedesktop.org/archives/dbus/2007-July/tread.html#8144
4842 * if you encounter this issue and want to attempt writing a patch.
4844 * @param connection the connection.
4845 * @param add_function function to begin monitoring a new descriptor.
4846 * @param remove_function function to stop monitoring a descriptor.
4847 * @param toggled_function function to notify of enable/disable
4848 * @param data data to pass to add_function and remove_function.
4849 * @param free_data_function function to be called to free the data.
4850 * @returns #FALSE on failure (no memory)
4853 dbus_connection_set_watch_functions (DBusConnection *connection,
4854 DBusAddWatchFunction add_function,
4855 DBusRemoveWatchFunction remove_function,
4856 DBusWatchToggledFunction toggled_function,
4858 DBusFreeFunction free_data_function)
4862 _dbus_return_val_if_fail (connection != NULL, FALSE);
4864 CONNECTION_LOCK (connection);
4866 retval = _dbus_watch_list_set_functions (connection->watches,
4867 add_function, remove_function,
4869 data, free_data_function);
4871 CONNECTION_UNLOCK (connection);
4877 * Sets the timeout functions for the connection. These functions are
4878 * responsible for making the application's main loop aware of timeouts.
4879 * When using Qt, typically the DBusAddTimeoutFunction would create a
4880 * QTimer. When using GLib, the DBusAddTimeoutFunction would call
4883 * The DBusTimeoutToggledFunction notifies the application that the
4884 * timeout has been enabled or disabled. Call
4885 * dbus_timeout_get_enabled() to check this. A disabled timeout should
4886 * have no effect, and enabled timeout should be added to the main
4887 * loop. This feature is used instead of simply adding/removing the
4888 * timeout because enabling/disabling can be done without memory
4889 * allocation. With Qt, QTimer::start() and QTimer::stop() can be used
4890 * to enable and disable. The toggled function may be NULL if a main
4891 * loop re-queries dbus_timeout_get_enabled() every time anyway.
4892 * Whenever a timeout is toggled, its interval may change.
4894 * The DBusTimeout can be queried for the timer interval using
4895 * dbus_timeout_get_interval(). dbus_timeout_handle() should be called
4896 * repeatedly, each time the interval elapses, starting after it has
4897 * elapsed once. The timeout stops firing when it is removed with the
4898 * given remove_function. The timer interval may change whenever the
4899 * timeout is added, removed, or toggled.
4901 * @note The thread lock on DBusConnection is held while
4902 * timeout functions are invoked, so inside these functions you
4903 * may not invoke any methods on DBusConnection or it will deadlock.
4904 * See the comments in the code or http://lists.freedesktop.org/archives/dbus/2007-July/thread.html#8144
4905 * if you encounter this issue and want to attempt writing a patch.
4907 * @param connection the connection.
4908 * @param add_function function to add a timeout.
4909 * @param remove_function function to remove a timeout.
4910 * @param toggled_function function to notify of enable/disable
4911 * @param data data to pass to add_function and remove_function.
4912 * @param free_data_function function to be called to free the data.
4913 * @returns #FALSE on failure (no memory)
4916 dbus_connection_set_timeout_functions (DBusConnection *connection,
4917 DBusAddTimeoutFunction add_function,
4918 DBusRemoveTimeoutFunction remove_function,
4919 DBusTimeoutToggledFunction toggled_function,
4921 DBusFreeFunction free_data_function)
4925 _dbus_return_val_if_fail (connection != NULL, FALSE);
4927 CONNECTION_LOCK (connection);
4929 retval = _dbus_timeout_list_set_functions (connection->timeouts,
4930 add_function, remove_function,
4932 data, free_data_function);
4934 CONNECTION_UNLOCK (connection);
4940 * Sets the mainloop wakeup function for the connection. This function
4941 * is responsible for waking up the main loop (if its sleeping in
4942 * another thread) when some some change has happened to the
4943 * connection that the mainloop needs to reconsider (e.g. a message
4944 * has been queued for writing). When using Qt, this typically
4945 * results in a call to QEventLoop::wakeUp(). When using GLib, it
4946 * would call g_main_context_wakeup().
4948 * @param connection the connection.
4949 * @param wakeup_main_function function to wake up the mainloop
4950 * @param data data to pass wakeup_main_function
4951 * @param free_data_function function to be called to free the data.
4954 dbus_connection_set_wakeup_main_function (DBusConnection *connection,
4955 DBusWakeupMainFunction wakeup_main_function,
4957 DBusFreeFunction free_data_function)
4960 DBusFreeFunction old_free_data;
4962 _dbus_return_if_fail (connection != NULL);
4964 CONNECTION_LOCK (connection);
4965 old_data = connection->wakeup_main_data;
4966 old_free_data = connection->free_wakeup_main_data;
4968 connection->wakeup_main_function = wakeup_main_function;
4969 connection->wakeup_main_data = data;
4970 connection->free_wakeup_main_data = free_data_function;
4972 CONNECTION_UNLOCK (connection);
4974 /* Callback outside the lock */
4976 (*old_free_data) (old_data);
4980 * Set a function to be invoked when the dispatch status changes.
4981 * If the dispatch status is #DBUS_DISPATCH_DATA_REMAINS, then
4982 * dbus_connection_dispatch() needs to be called to process incoming
4983 * messages. However, dbus_connection_dispatch() MUST NOT BE CALLED
4984 * from inside the DBusDispatchStatusFunction. Indeed, almost
4985 * any reentrancy in this function is a bad idea. Instead,
4986 * the DBusDispatchStatusFunction should simply save an indication
4987 * that messages should be dispatched later, when the main loop
4990 * If you don't set a dispatch status function, you have to be sure to
4991 * dispatch on every iteration of your main loop, especially if
4992 * dbus_watch_handle() or dbus_timeout_handle() were called.
4994 * @param connection the connection
4995 * @param function function to call on dispatch status changes
4996 * @param data data for function
4997 * @param free_data_function free the function data
5000 dbus_connection_set_dispatch_status_function (DBusConnection *connection,
5001 DBusDispatchStatusFunction function,
5003 DBusFreeFunction free_data_function)
5006 DBusFreeFunction old_free_data;
5008 _dbus_return_if_fail (connection != NULL);
5010 CONNECTION_LOCK (connection);
5011 old_data = connection->dispatch_status_data;
5012 old_free_data = connection->free_dispatch_status_data;
5014 connection->dispatch_status_function = function;
5015 connection->dispatch_status_data = data;
5016 connection->free_dispatch_status_data = free_data_function;
5018 CONNECTION_UNLOCK (connection);
5020 /* Callback outside the lock */
5022 (*old_free_data) (old_data);
5026 * Get the UNIX file descriptor of the connection, if any. This can
5027 * be used for SELinux access control checks with getpeercon() for
5028 * example. DO NOT read or write to the file descriptor, or try to
5029 * select() on it; use DBusWatch for main loop integration. Not all
5030 * connections will have a file descriptor. So for adding descriptors
5031 * to the main loop, use dbus_watch_get_unix_fd() and so forth.
5033 * If the connection is socket-based, you can also use
5034 * dbus_connection_get_socket(), which will work on Windows too.
5035 * This function always fails on Windows.
5037 * Right now the returned descriptor is always a socket, but
5038 * that is not guaranteed.
5040 * @param connection the connection
5041 * @param fd return location for the file descriptor.
5042 * @returns #TRUE if fd is successfully obtained.
5045 dbus_connection_get_unix_fd (DBusConnection *connection,
5048 _dbus_return_val_if_fail (connection != NULL, FALSE);
5049 _dbus_return_val_if_fail (connection->transport != NULL, FALSE);
5052 /* FIXME do this on a lower level */
5056 return dbus_connection_get_socket(connection, fd);
5060 * Gets the underlying Windows or UNIX socket file descriptor
5061 * of the connection, if any. DO NOT read or write to the file descriptor, or try to
5062 * select() on it; use DBusWatch for main loop integration. Not all
5063 * connections will have a socket. So for adding descriptors
5064 * to the main loop, use dbus_watch_get_socket() and so forth.
5066 * If the connection is not socket-based, this function will return FALSE,
5067 * even if the connection does have a file descriptor of some kind.
5068 * i.e. this function always returns specifically a socket file descriptor.
5070 * @param connection the connection
5071 * @param fd return location for the file descriptor.
5072 * @returns #TRUE if fd is successfully obtained.
5075 dbus_connection_get_socket(DBusConnection *connection,
5080 _dbus_return_val_if_fail (connection != NULL, FALSE);
5081 _dbus_return_val_if_fail (connection->transport != NULL, FALSE);
5083 CONNECTION_LOCK (connection);
5085 retval = _dbus_transport_get_socket_fd (connection->transport,
5088 CONNECTION_UNLOCK (connection);
5095 * Gets the UNIX user ID of the connection if known. Returns #TRUE if
5096 * the uid is filled in. Always returns #FALSE on non-UNIX platforms
5097 * for now, though in theory someone could hook Windows to NIS or
5098 * something. Always returns #FALSE prior to authenticating the
5101 * The UID is only read by servers from clients; clients can't usually
5102 * get the UID of servers, because servers do not authenticate to
5103 * clients. The returned UID is the UID the connection authenticated
5106 * The message bus is a server and the apps connecting to the bus
5109 * You can ask the bus to tell you the UID of another connection though
5110 * if you like; this is done with dbus_bus_get_unix_user().
5112 * @param connection the connection
5113 * @param uid return location for the user ID
5114 * @returns #TRUE if uid is filled in with a valid user ID
5117 dbus_connection_get_unix_user (DBusConnection *connection,
5122 _dbus_return_val_if_fail (connection != NULL, FALSE);
5123 _dbus_return_val_if_fail (uid != NULL, FALSE);
5125 CONNECTION_LOCK (connection);
5127 if (!_dbus_transport_get_is_authenticated (connection->transport))
5130 result = _dbus_transport_get_unix_user (connection->transport,
5134 _dbus_assert (!result);
5137 CONNECTION_UNLOCK (connection);
5143 * Gets the process ID of the connection if any.
5144 * Returns #TRUE if the pid is filled in.
5145 * Always returns #FALSE prior to authenticating the
5148 * @param connection the connection
5149 * @param pid return location for the process ID
5150 * @returns #TRUE if uid is filled in with a valid process ID
5153 dbus_connection_get_unix_process_id (DBusConnection *connection,
5158 _dbus_return_val_if_fail (connection != NULL, FALSE);
5159 _dbus_return_val_if_fail (pid != NULL, FALSE);
5161 CONNECTION_LOCK (connection);
5163 if (!_dbus_transport_get_is_authenticated (connection->transport))
5166 result = _dbus_transport_get_unix_process_id (connection->transport,
5169 CONNECTION_UNLOCK (connection);
5175 * Gets the ADT audit data of the connection if any.
5176 * Returns #TRUE if the structure pointer is returned.
5177 * Always returns #FALSE prior to authenticating the
5180 * @param connection the connection
5181 * @param data return location for audit data
5182 * @returns #TRUE if audit data is filled in with a valid ucred pointer
5185 dbus_connection_get_adt_audit_session_data (DBusConnection *connection,
5187 dbus_int32_t *data_size)
5191 _dbus_return_val_if_fail (connection != NULL, FALSE);
5192 _dbus_return_val_if_fail (data != NULL, FALSE);
5193 _dbus_return_val_if_fail (data_size != NULL, FALSE);
5195 CONNECTION_LOCK (connection);
5197 if (!_dbus_transport_get_is_authenticated (connection->transport))
5200 result = _dbus_transport_get_adt_audit_session_data (connection->transport,
5203 CONNECTION_UNLOCK (connection);
5209 * Sets a predicate function used to determine whether a given user ID
5210 * is allowed to connect. When an incoming connection has
5211 * authenticated with a particular user ID, this function is called;
5212 * if it returns #TRUE, the connection is allowed to proceed,
5213 * otherwise the connection is disconnected.
5215 * If the function is set to #NULL (as it is by default), then
5216 * only the same UID as the server process will be allowed to
5217 * connect. Also, root is always allowed to connect.
5219 * On Windows, the function will be set and its free_data_function will
5220 * be invoked when the connection is freed or a new function is set.
5221 * However, the function will never be called, because there are
5222 * no UNIX user ids to pass to it, or at least none of the existing
5223 * auth protocols would allow authenticating as a UNIX user on Windows.
5225 * @param connection the connection
5226 * @param function the predicate
5227 * @param data data to pass to the predicate
5228 * @param free_data_function function to free the data
5231 dbus_connection_set_unix_user_function (DBusConnection *connection,
5232 DBusAllowUnixUserFunction function,
5234 DBusFreeFunction free_data_function)
5236 void *old_data = NULL;
5237 DBusFreeFunction old_free_function = NULL;
5239 _dbus_return_if_fail (connection != NULL);
5241 CONNECTION_LOCK (connection);
5242 _dbus_transport_set_unix_user_function (connection->transport,
5243 function, data, free_data_function,
5244 &old_data, &old_free_function);
5245 CONNECTION_UNLOCK (connection);
5247 if (old_free_function != NULL)
5248 (* old_free_function) (old_data);
5252 * Gets the Windows user SID of the connection if known. Returns
5253 * #TRUE if the ID is filled in. Always returns #FALSE on non-Windows
5254 * platforms for now, though in theory someone could hook UNIX to
5255 * Active Directory or something. Always returns #FALSE prior to
5256 * authenticating the connection.
5258 * The user is only read by servers from clients; clients can't usually
5259 * get the user of servers, because servers do not authenticate to
5260 * clients. The returned user is the user the connection authenticated
5263 * The message bus is a server and the apps connecting to the bus
5266 * The returned user string has to be freed with dbus_free().
5268 * The return value indicates whether the user SID is available;
5269 * if it's available but we don't have the memory to copy it,
5270 * then the return value is #TRUE and #NULL is given as the SID.
5272 * @todo We would like to be able to say "You can ask the bus to tell
5273 * you the user of another connection though if you like; this is done
5274 * with dbus_bus_get_windows_user()." But this has to be implemented
5275 * in bus/driver.c and dbus/dbus-bus.c, and is pointless anyway
5276 * since on Windows we only use the session bus for now.
5278 * @param connection the connection
5279 * @param windows_sid_p return location for an allocated copy of the user ID, or #NULL if no memory
5280 * @returns #TRUE if user is available (returned value may be #NULL anyway if no memory)
5283 dbus_connection_get_windows_user (DBusConnection *connection,
5284 char **windows_sid_p)
5288 _dbus_return_val_if_fail (connection != NULL, FALSE);
5289 _dbus_return_val_if_fail (windows_sid_p != NULL, FALSE);
5291 CONNECTION_LOCK (connection);
5293 if (!_dbus_transport_get_is_authenticated (connection->transport))
5296 result = _dbus_transport_get_windows_user (connection->transport,
5300 _dbus_assert (!result);
5303 CONNECTION_UNLOCK (connection);
5309 * Sets a predicate function used to determine whether a given user ID
5310 * is allowed to connect. When an incoming connection has
5311 * authenticated with a particular user ID, this function is called;
5312 * if it returns #TRUE, the connection is allowed to proceed,
5313 * otherwise the connection is disconnected.
5315 * If the function is set to #NULL (as it is by default), then
5316 * only the same user owning the server process will be allowed to
5319 * On UNIX, the function will be set and its free_data_function will
5320 * be invoked when the connection is freed or a new function is set.
5321 * However, the function will never be called, because there is no
5322 * way right now to authenticate as a Windows user on UNIX.
5324 * @param connection the connection
5325 * @param function the predicate
5326 * @param data data to pass to the predicate
5327 * @param free_data_function function to free the data
5330 dbus_connection_set_windows_user_function (DBusConnection *connection,
5331 DBusAllowWindowsUserFunction function,
5333 DBusFreeFunction free_data_function)
5335 void *old_data = NULL;
5336 DBusFreeFunction old_free_function = NULL;
5338 _dbus_return_if_fail (connection != NULL);
5340 CONNECTION_LOCK (connection);
5341 _dbus_transport_set_windows_user_function (connection->transport,
5342 function, data, free_data_function,
5343 &old_data, &old_free_function);
5344 CONNECTION_UNLOCK (connection);
5346 if (old_free_function != NULL)
5347 (* old_free_function) (old_data);
5351 * This function must be called on the server side of a connection when the
5352 * connection is first seen in the #DBusNewConnectionFunction. If set to
5353 * #TRUE (the default is #FALSE), then the connection can proceed even if
5354 * the client does not authenticate as some user identity, i.e. clients
5355 * can connect anonymously.
5357 * This setting interacts with the available authorization mechanisms
5358 * (see dbus_server_set_auth_mechanisms()). Namely, an auth mechanism
5359 * such as ANONYMOUS that supports anonymous auth must be included in
5360 * the list of available mechanisms for anonymous login to work.
5362 * This setting also changes the default rule for connections
5363 * authorized as a user; normally, if a connection authorizes as
5364 * a user identity, it is permitted if the user identity is
5365 * root or the user identity matches the user identity of the server
5366 * process. If anonymous connections are allowed, however,
5367 * then any user identity is allowed.
5369 * You can override the rules for connections authorized as a
5370 * user identity with dbus_connection_set_unix_user_function()
5371 * and dbus_connection_set_windows_user_function().
5373 * @param connection the connection
5374 * @param value whether to allow authentication as an anonymous user
5377 dbus_connection_set_allow_anonymous (DBusConnection *connection,
5380 _dbus_return_if_fail (connection != NULL);
5382 CONNECTION_LOCK (connection);
5383 _dbus_transport_set_allow_anonymous (connection->transport, value);
5384 CONNECTION_UNLOCK (connection);
5389 * Normally #DBusConnection automatically handles all messages to the
5390 * org.freedesktop.DBus.Peer interface. However, the message bus wants
5391 * to be able to route methods on that interface through the bus and
5392 * to other applications. If routing peer messages is enabled, then
5393 * messages with the org.freedesktop.DBus.Peer interface that also
5394 * have a bus destination name set will not be automatically
5395 * handled by the #DBusConnection and instead will be dispatched
5396 * normally to the application.
5398 * If a normal application sets this flag, it can break things badly.
5399 * So don't set this unless you are the message bus.
5401 * @param connection the connection
5402 * @param value #TRUE to pass through org.freedesktop.DBus.Peer messages with a bus name set
5405 dbus_connection_set_route_peer_messages (DBusConnection *connection,
5408 _dbus_return_if_fail (connection != NULL);
5410 CONNECTION_LOCK (connection);
5411 connection->route_peer_messages = TRUE;
5412 CONNECTION_UNLOCK (connection);
5416 * Adds a message filter. Filters are handlers that are run on all
5417 * incoming messages, prior to the objects registered with
5418 * dbus_connection_register_object_path(). Filters are run in the
5419 * order that they were added. The same handler can be added as a
5420 * filter more than once, in which case it will be run more than once.
5421 * Filters added during a filter callback won't be run on the message
5424 * @todo we don't run filters on messages while blocking without
5425 * entering the main loop, since filters are run as part of
5426 * dbus_connection_dispatch(). This is probably a feature, as filters
5427 * could create arbitrary reentrancy. But kind of sucks if you're
5428 * trying to filter METHOD_RETURN for some reason.
5430 * @param connection the connection
5431 * @param function function to handle messages
5432 * @param user_data user data to pass to the function
5433 * @param free_data_function function to use for freeing user data
5434 * @returns #TRUE on success, #FALSE if not enough memory.
5437 dbus_connection_add_filter (DBusConnection *connection,
5438 DBusHandleMessageFunction function,
5440 DBusFreeFunction free_data_function)
5442 DBusMessageFilter *filter;
5444 _dbus_return_val_if_fail (connection != NULL, FALSE);
5445 _dbus_return_val_if_fail (function != NULL, FALSE);
5447 filter = dbus_new0 (DBusMessageFilter, 1);
5451 _dbus_atomic_inc (&filter->refcount);
5453 CONNECTION_LOCK (connection);
5455 if (!_dbus_list_append (&connection->filter_list,
5458 _dbus_message_filter_unref (filter);
5459 CONNECTION_UNLOCK (connection);
5463 /* Fill in filter after all memory allocated,
5464 * so we don't run the free_user_data_function
5465 * if the add_filter() fails
5468 filter->function = function;
5469 filter->user_data = user_data;
5470 filter->free_user_data_function = free_data_function;
5472 CONNECTION_UNLOCK (connection);
5477 * Removes a previously-added message filter. It is a programming
5478 * error to call this function for a handler that has not been added
5479 * as a filter. If the given handler was added more than once, only
5480 * one instance of it will be removed (the most recently-added
5483 * @param connection the connection
5484 * @param function the handler to remove
5485 * @param user_data user data for the handler to remove
5489 dbus_connection_remove_filter (DBusConnection *connection,
5490 DBusHandleMessageFunction function,
5494 DBusMessageFilter *filter;
5496 _dbus_return_if_fail (connection != NULL);
5497 _dbus_return_if_fail (function != NULL);
5499 CONNECTION_LOCK (connection);
5503 link = _dbus_list_get_last_link (&connection->filter_list);
5504 while (link != NULL)
5506 filter = link->data;
5508 if (filter->function == function &&
5509 filter->user_data == user_data)
5511 _dbus_list_remove_link (&connection->filter_list, link);
5512 filter->function = NULL;
5517 link = _dbus_list_get_prev_link (&connection->filter_list, link);
5521 CONNECTION_UNLOCK (connection);
5523 #ifndef DBUS_DISABLE_CHECKS
5526 _dbus_warn_check_failed ("Attempt to remove filter function %p user data %p, but no such filter has been added\n",
5527 function, user_data);
5532 /* Call application code */
5533 if (filter->free_user_data_function)
5534 (* filter->free_user_data_function) (filter->user_data);
5536 filter->free_user_data_function = NULL;
5537 filter->user_data = NULL;
5539 _dbus_message_filter_unref (filter);
5543 * Registers a handler for a given path or subsection in the object
5544 * hierarchy. The given vtable handles messages sent to exactly the
5545 * given path or also for paths bellow that, depending on fallback
5548 * @param connection the connection
5549 * @param fallback whether to handle messages also for "subdirectory"
5550 * @param path a '/' delimited string of path elements
5551 * @param vtable the virtual table
5552 * @param user_data data to pass to functions in the vtable
5553 * @param error address where an error can be returned
5554 * @returns #FALSE if an error (#DBUS_ERROR_NO_MEMORY or
5555 * #DBUS_ERROR_OBJECT_PATH_IN_USE) is reported
5558 _dbus_connection_register_object_path (DBusConnection *connection,
5559 dbus_bool_t fallback,
5561 const DBusObjectPathVTable *vtable,
5565 char **decomposed_path;
5568 if (!_dbus_decompose_path (path, strlen (path), &decomposed_path, NULL))
5571 CONNECTION_LOCK (connection);
5573 retval = _dbus_object_tree_register (connection->objects,
5575 (const char **) decomposed_path, vtable,
5578 CONNECTION_UNLOCK (connection);
5580 dbus_free_string_array (decomposed_path);
5586 * Registers a handler for a given path in the object hierarchy.
5587 * The given vtable handles messages sent to exactly the given path.
5589 * @param connection the connection
5590 * @param path a '/' delimited string of path elements
5591 * @param vtable the virtual table
5592 * @param user_data data to pass to functions in the vtable
5593 * @param error address where an error can be returned
5594 * @returns #FALSE if an error (#DBUS_ERROR_NO_MEMORY or
5595 * #DBUS_ERROR_OBJECT_PATH_IN_USE) is reported
5598 dbus_connection_try_register_object_path (DBusConnection *connection,
5600 const DBusObjectPathVTable *vtable,
5604 _dbus_return_val_if_fail (connection != NULL, FALSE);
5605 _dbus_return_val_if_fail (path != NULL, FALSE);
5606 _dbus_return_val_if_fail (path[0] == '/', FALSE);
5607 _dbus_return_val_if_fail (vtable != NULL, FALSE);
5609 return _dbus_connection_register_object_path (connection, FALSE, path, vtable, user_data, error);
5613 * Registers a handler for a given path in the object hierarchy.
5614 * The given vtable handles messages sent to exactly the given path.
5616 * It is a bug to call this function for object paths which already
5617 * have a handler. Use dbus_connection_try_register_object_path() if this
5618 * might be the case.
5620 * @param connection the connection
5621 * @param path a '/' delimited string of path elements
5622 * @param vtable the virtual table
5623 * @param user_data data to pass to functions in the vtable
5624 * @returns #FALSE if an error (#DBUS_ERROR_NO_MEMORY or
5625 * #DBUS_ERROR_OBJECT_PATH_IN_USE) ocurred
5628 dbus_connection_register_object_path (DBusConnection *connection,
5630 const DBusObjectPathVTable *vtable,
5634 DBusError error = DBUS_ERROR_INIT;
5636 _dbus_return_val_if_fail (connection != NULL, FALSE);
5637 _dbus_return_val_if_fail (path != NULL, FALSE);
5638 _dbus_return_val_if_fail (path[0] == '/', FALSE);
5639 _dbus_return_val_if_fail (vtable != NULL, FALSE);
5641 retval = _dbus_connection_register_object_path (connection, FALSE, path, vtable, user_data, &error);
5643 if (dbus_error_has_name (&error, DBUS_ERROR_OBJECT_PATH_IN_USE))
5645 _dbus_warn ("%s\n", error.message);
5646 dbus_error_free (&error);
5654 * Registers a fallback handler for a given subsection of the object
5655 * hierarchy. The given vtable handles messages at or below the given
5656 * path. You can use this to establish a default message handling
5657 * policy for a whole "subdirectory."
5659 * @param connection the connection
5660 * @param path a '/' delimited string of path elements
5661 * @param vtable the virtual table
5662 * @param user_data data to pass to functions in the vtable
5663 * @param error address where an error can be returned
5664 * @returns #FALSE if an error (#DBUS_ERROR_NO_MEMORY or
5665 * #DBUS_ERROR_OBJECT_PATH_IN_USE) is reported
5668 dbus_connection_try_register_fallback (DBusConnection *connection,
5670 const DBusObjectPathVTable *vtable,
5674 _dbus_return_val_if_fail (connection != NULL, FALSE);
5675 _dbus_return_val_if_fail (path != NULL, FALSE);
5676 _dbus_return_val_if_fail (path[0] == '/', FALSE);
5677 _dbus_return_val_if_fail (vtable != NULL, FALSE);
5679 return _dbus_connection_register_object_path (connection, TRUE, path, vtable, user_data, error);
5683 * Registers a fallback handler for a given subsection of the object
5684 * hierarchy. The given vtable handles messages at or below the given
5685 * path. You can use this to establish a default message handling
5686 * policy for a whole "subdirectory."
5688 * It is a bug to call this function for object paths which already
5689 * have a handler. Use dbus_connection_try_register_fallback() if this
5690 * might be the case.
5692 * @param connection the connection
5693 * @param path a '/' delimited string of path elements
5694 * @param vtable the virtual table
5695 * @param user_data data to pass to functions in the vtable
5696 * @returns #FALSE if an error (#DBUS_ERROR_NO_MEMORY or
5697 * #DBUS_ERROR_OBJECT_PATH_IN_USE) occured
5700 dbus_connection_register_fallback (DBusConnection *connection,
5702 const DBusObjectPathVTable *vtable,
5706 DBusError error = DBUS_ERROR_INIT;
5708 _dbus_return_val_if_fail (connection != NULL, FALSE);
5709 _dbus_return_val_if_fail (path != NULL, FALSE);
5710 _dbus_return_val_if_fail (path[0] == '/', FALSE);
5711 _dbus_return_val_if_fail (vtable != NULL, FALSE);
5713 retval = _dbus_connection_register_object_path (connection, TRUE, path, vtable, user_data, &error);
5715 if (dbus_error_has_name (&error, DBUS_ERROR_OBJECT_PATH_IN_USE))
5717 _dbus_warn ("%s\n", error.message);
5718 dbus_error_free (&error);
5726 * Unregisters the handler registered with exactly the given path.
5727 * It's a bug to call this function for a path that isn't registered.
5728 * Can unregister both fallback paths and object paths.
5730 * @param connection the connection
5731 * @param path a '/' delimited string of path elements
5732 * @returns #FALSE if not enough memory
5735 dbus_connection_unregister_object_path (DBusConnection *connection,
5738 char **decomposed_path;
5740 _dbus_return_val_if_fail (connection != NULL, FALSE);
5741 _dbus_return_val_if_fail (path != NULL, FALSE);
5742 _dbus_return_val_if_fail (path[0] == '/', FALSE);
5744 if (!_dbus_decompose_path (path, strlen (path), &decomposed_path, NULL))
5747 CONNECTION_LOCK (connection);
5749 _dbus_object_tree_unregister_and_unlock (connection->objects, (const char **) decomposed_path);
5751 dbus_free_string_array (decomposed_path);
5757 * Gets the user data passed to dbus_connection_register_object_path()
5758 * or dbus_connection_register_fallback(). If nothing was registered
5759 * at this path, the data is filled in with #NULL.
5761 * @param connection the connection
5762 * @param path the path you registered with
5763 * @param data_p location to store the user data, or #NULL
5764 * @returns #FALSE if not enough memory
5767 dbus_connection_get_object_path_data (DBusConnection *connection,
5771 char **decomposed_path;
5773 _dbus_return_val_if_fail (connection != NULL, FALSE);
5774 _dbus_return_val_if_fail (path != NULL, FALSE);
5775 _dbus_return_val_if_fail (data_p != NULL, FALSE);
5779 if (!_dbus_decompose_path (path, strlen (path), &decomposed_path, NULL))
5782 CONNECTION_LOCK (connection);
5784 *data_p = _dbus_object_tree_get_user_data_unlocked (connection->objects, (const char**) decomposed_path);
5786 CONNECTION_UNLOCK (connection);
5788 dbus_free_string_array (decomposed_path);
5794 * Lists the registered fallback handlers and object path handlers at
5795 * the given parent_path. The returned array should be freed with
5796 * dbus_free_string_array().
5798 * @param connection the connection
5799 * @param parent_path the path to list the child handlers of
5800 * @param child_entries returns #NULL-terminated array of children
5801 * @returns #FALSE if no memory to allocate the child entries
5804 dbus_connection_list_registered (DBusConnection *connection,
5805 const char *parent_path,
5806 char ***child_entries)
5808 char **decomposed_path;
5810 _dbus_return_val_if_fail (connection != NULL, FALSE);
5811 _dbus_return_val_if_fail (parent_path != NULL, FALSE);
5812 _dbus_return_val_if_fail (parent_path[0] == '/', FALSE);
5813 _dbus_return_val_if_fail (child_entries != NULL, FALSE);
5815 if (!_dbus_decompose_path (parent_path, strlen (parent_path), &decomposed_path, NULL))
5818 CONNECTION_LOCK (connection);
5820 retval = _dbus_object_tree_list_registered_and_unlock (connection->objects,
5821 (const char **) decomposed_path,
5823 dbus_free_string_array (decomposed_path);
5828 static DBusDataSlotAllocator slot_allocator;
5829 _DBUS_DEFINE_GLOBAL_LOCK (connection_slots);
5832 * Allocates an integer ID to be used for storing application-specific
5833 * data on any DBusConnection. The allocated ID may then be used
5834 * with dbus_connection_set_data() and dbus_connection_get_data().
5835 * The passed-in slot must be initialized to -1, and is filled in
5836 * with the slot ID. If the passed-in slot is not -1, it's assumed
5837 * to be already allocated, and its refcount is incremented.
5839 * The allocated slot is global, i.e. all DBusConnection objects will
5840 * have a slot with the given integer ID reserved.
5842 * @param slot_p address of a global variable storing the slot
5843 * @returns #FALSE on failure (no memory)
5846 dbus_connection_allocate_data_slot (dbus_int32_t *slot_p)
5848 return _dbus_data_slot_allocator_alloc (&slot_allocator,
5849 &_DBUS_LOCK_NAME (connection_slots),
5854 * Deallocates a global ID for connection data slots.
5855 * dbus_connection_get_data() and dbus_connection_set_data() may no
5856 * longer be used with this slot. Existing data stored on existing
5857 * DBusConnection objects will be freed when the connection is
5858 * finalized, but may not be retrieved (and may only be replaced if
5859 * someone else reallocates the slot). When the refcount on the
5860 * passed-in slot reaches 0, it is set to -1.
5862 * @param slot_p address storing the slot to deallocate
5865 dbus_connection_free_data_slot (dbus_int32_t *slot_p)
5867 _dbus_return_if_fail (*slot_p >= 0);
5869 _dbus_data_slot_allocator_free (&slot_allocator, slot_p);
5873 * Stores a pointer on a DBusConnection, along
5874 * with an optional function to be used for freeing
5875 * the data when the data is set again, or when
5876 * the connection is finalized. The slot number
5877 * must have been allocated with dbus_connection_allocate_data_slot().
5879 * @note This function does not take the
5880 * main thread lock on DBusConnection, which allows it to be
5881 * used from inside watch and timeout functions. (See the
5882 * note in docs for dbus_connection_set_watch_functions().)
5883 * A side effect of this is that you need to know there's
5884 * a reference held on the connection while invoking
5885 * dbus_connection_set_data(), or the connection could be
5886 * finalized during dbus_connection_set_data().
5888 * @param connection the connection
5889 * @param slot the slot number
5890 * @param data the data to store
5891 * @param free_data_func finalizer function for the data
5892 * @returns #TRUE if there was enough memory to store the data
5895 dbus_connection_set_data (DBusConnection *connection,
5898 DBusFreeFunction free_data_func)
5900 DBusFreeFunction old_free_func;
5904 _dbus_return_val_if_fail (connection != NULL, FALSE);
5905 _dbus_return_val_if_fail (slot >= 0, FALSE);
5907 SLOTS_LOCK (connection);
5909 retval = _dbus_data_slot_list_set (&slot_allocator,
5910 &connection->slot_list,
5911 slot, data, free_data_func,
5912 &old_free_func, &old_data);
5914 SLOTS_UNLOCK (connection);
5918 /* Do the actual free outside the connection lock */
5920 (* old_free_func) (old_data);
5927 * Retrieves data previously set with dbus_connection_set_data().
5928 * The slot must still be allocated (must not have been freed).
5930 * @note This function does not take the
5931 * main thread lock on DBusConnection, which allows it to be
5932 * used from inside watch and timeout functions. (See the
5933 * note in docs for dbus_connection_set_watch_functions().)
5934 * A side effect of this is that you need to know there's
5935 * a reference held on the connection while invoking
5936 * dbus_connection_get_data(), or the connection could be
5937 * finalized during dbus_connection_get_data().
5939 * @param connection the connection
5940 * @param slot the slot to get data from
5941 * @returns the data, or #NULL if not found
5944 dbus_connection_get_data (DBusConnection *connection,
5949 _dbus_return_val_if_fail (connection != NULL, NULL);
5951 SLOTS_LOCK (connection);
5953 res = _dbus_data_slot_list_get (&slot_allocator,
5954 &connection->slot_list,
5957 SLOTS_UNLOCK (connection);
5963 * This function sets a global flag for whether dbus_connection_new()
5964 * will set SIGPIPE behavior to SIG_IGN.
5966 * @param will_modify_sigpipe #TRUE to allow sigpipe to be set to SIG_IGN
5969 dbus_connection_set_change_sigpipe (dbus_bool_t will_modify_sigpipe)
5971 _dbus_modify_sigpipe = will_modify_sigpipe != FALSE;
5975 * Specifies the maximum size message this connection is allowed to
5976 * receive. Larger messages will result in disconnecting the
5979 * @param connection a #DBusConnection
5980 * @param size maximum message size the connection can receive, in bytes
5983 dbus_connection_set_max_message_size (DBusConnection *connection,
5986 _dbus_return_if_fail (connection != NULL);
5988 CONNECTION_LOCK (connection);
5989 _dbus_transport_set_max_message_size (connection->transport,
5991 CONNECTION_UNLOCK (connection);
5995 * Gets the value set by dbus_connection_set_max_message_size().
5997 * @param connection the connection
5998 * @returns the max size of a single message
6001 dbus_connection_get_max_message_size (DBusConnection *connection)
6005 _dbus_return_val_if_fail (connection != NULL, 0);
6007 CONNECTION_LOCK (connection);
6008 res = _dbus_transport_get_max_message_size (connection->transport);
6009 CONNECTION_UNLOCK (connection);
6014 * Specifies the maximum number of unix fds a message on this
6015 * connection is allowed to receive. Messages with more unix fds will
6016 * result in disconnecting the connection.
6018 * @param connection a #DBusConnection
6019 * @param size maximum message unix fds the connection can receive
6022 dbus_connection_set_max_message_unix_fds (DBusConnection *connection,
6025 _dbus_return_if_fail (connection != NULL);
6027 CONNECTION_LOCK (connection);
6028 _dbus_transport_set_max_message_unix_fds (connection->transport,
6030 CONNECTION_UNLOCK (connection);
6034 * Gets the value set by dbus_connection_set_max_message_unix_fds().
6036 * @param connection the connection
6037 * @returns the max numer of unix fds of a single message
6040 dbus_connection_get_max_message_unix_fds (DBusConnection *connection)
6044 _dbus_return_val_if_fail (connection != NULL, 0);
6046 CONNECTION_LOCK (connection);
6047 res = _dbus_transport_get_max_message_unix_fds (connection->transport);
6048 CONNECTION_UNLOCK (connection);
6053 * Sets the maximum total number of bytes that can be used for all messages
6054 * received on this connection. Messages count toward the maximum until
6055 * they are finalized. When the maximum is reached, the connection will
6056 * not read more data until some messages are finalized.
6058 * The semantics of the maximum are: if outstanding messages are
6059 * already above the maximum, additional messages will not be read.
6060 * The semantics are not: if the next message would cause us to exceed
6061 * the maximum, we don't read it. The reason is that we don't know the
6062 * size of a message until after we read it.
6064 * Thus, the max live messages size can actually be exceeded
6065 * by up to the maximum size of a single message.
6067 * Also, if we read say 1024 bytes off the wire in a single read(),
6068 * and that contains a half-dozen small messages, we may exceed the
6069 * size max by that amount. But this should be inconsequential.
6071 * This does imply that we can't call read() with a buffer larger
6072 * than we're willing to exceed this limit by.
6074 * @param connection the connection
6075 * @param size the maximum size in bytes of all outstanding messages
6078 dbus_connection_set_max_received_size (DBusConnection *connection,
6081 _dbus_return_if_fail (connection != NULL);
6083 CONNECTION_LOCK (connection);
6084 _dbus_transport_set_max_received_size (connection->transport,
6086 CONNECTION_UNLOCK (connection);
6090 * Gets the value set by dbus_connection_set_max_received_size().
6092 * @param connection the connection
6093 * @returns the max size of all live messages
6096 dbus_connection_get_max_received_size (DBusConnection *connection)
6100 _dbus_return_val_if_fail (connection != NULL, 0);
6102 CONNECTION_LOCK (connection);
6103 res = _dbus_transport_get_max_received_size (connection->transport);
6104 CONNECTION_UNLOCK (connection);
6109 * Sets the maximum total number of unix fds that can be used for all messages
6110 * received on this connection. Messages count toward the maximum until
6111 * they are finalized. When the maximum is reached, the connection will
6112 * not read more data until some messages are finalized.
6114 * The semantics are analogous to those of dbus_connection_set_max_received_size().
6116 * @param connection the connection
6117 * @param size the maximum size in bytes of all outstanding messages
6120 dbus_connection_set_max_received_unix_fds (DBusConnection *connection,
6123 _dbus_return_if_fail (connection != NULL);
6125 CONNECTION_LOCK (connection);
6126 _dbus_transport_set_max_received_unix_fds (connection->transport,
6128 CONNECTION_UNLOCK (connection);
6132 * Gets the value set by dbus_connection_set_max_received_unix_fds().
6134 * @param connection the connection
6135 * @returns the max unix fds of all live messages
6138 dbus_connection_get_max_received_unix_fds (DBusConnection *connection)
6142 _dbus_return_val_if_fail (connection != NULL, 0);
6144 CONNECTION_LOCK (connection);
6145 res = _dbus_transport_get_max_received_unix_fds (connection->transport);
6146 CONNECTION_UNLOCK (connection);
6151 * Gets the approximate size in bytes of all messages in the outgoing
6152 * message queue. The size is approximate in that you shouldn't use
6153 * it to decide how many bytes to read off the network or anything
6154 * of that nature, as optimizations may choose to tell small white lies
6155 * to avoid performance overhead.
6157 * @param connection the connection
6158 * @returns the number of bytes that have been queued up but not sent
6161 dbus_connection_get_outgoing_size (DBusConnection *connection)
6165 _dbus_return_val_if_fail (connection != NULL, 0);
6167 CONNECTION_LOCK (connection);
6168 res = _dbus_counter_get_size_value (connection->outgoing_counter);
6169 CONNECTION_UNLOCK (connection);
6173 #ifdef DBUS_ENABLE_STATS
6175 _dbus_connection_get_stats (DBusConnection *connection,
6176 dbus_uint32_t *in_messages,
6177 dbus_uint32_t *in_bytes,
6178 dbus_uint32_t *in_fds,
6179 dbus_uint32_t *in_peak_bytes,
6180 dbus_uint32_t *in_peak_fds,
6181 dbus_uint32_t *out_messages,
6182 dbus_uint32_t *out_bytes,
6183 dbus_uint32_t *out_fds,
6184 dbus_uint32_t *out_peak_bytes,
6185 dbus_uint32_t *out_peak_fds,
6186 dbus_uint32_t *link_cache_size)
6188 CONNECTION_LOCK (connection);
6190 if (in_messages != NULL)
6191 *in_messages = connection->n_incoming;
6193 _dbus_transport_get_stats (connection->transport,
6194 in_bytes, in_fds, in_peak_bytes, in_peak_fds);
6196 if (out_messages != NULL)
6197 *out_messages = connection->n_outgoing;
6199 if (out_bytes != NULL)
6200 *out_bytes = _dbus_counter_get_size_value (connection->outgoing_counter);
6202 if (out_fds != NULL)
6203 *out_fds = _dbus_counter_get_unix_fd_value (connection->outgoing_counter);
6205 if (out_peak_bytes != NULL)
6206 *out_peak_bytes = _dbus_counter_get_peak_size_value (connection->outgoing_counter);
6208 if (out_peak_fds != NULL)
6209 *out_peak_fds = _dbus_counter_get_peak_unix_fd_value (connection->outgoing_counter);
6211 if (link_cache_size != NULL)
6213 *link_cache_size = _dbus_list_get_length (&connection->link_cache) * sizeof (DBusList);
6216 CONNECTION_UNLOCK (connection);
6218 #endif /* DBUS_ENABLE_STATS */
6221 * Gets the approximate number of uni fds of all messages in the
6222 * outgoing message queue.
6224 * @param connection the connection
6225 * @returns the number of unix fds that have been queued up but not sent
6228 dbus_connection_get_outgoing_unix_fds (DBusConnection *connection)
6232 _dbus_return_val_if_fail (connection != NULL, 0);
6234 CONNECTION_LOCK (connection);
6235 res = _dbus_counter_get_unix_fd_value (connection->outgoing_counter);
6236 CONNECTION_UNLOCK (connection);