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dbus-connection.c

00001 /* -*- mode: C; c-file-style: "gnu" -*- */
00002 /* dbus-connection.c DBusConnection object
00003  *
00004  * Copyright (C) 2002, 2003  Red Hat Inc.
00005  *
00006  * Licensed under the Academic Free License version 1.2
00007  * 
00008  * This program is free software; you can redistribute it and/or modify
00009  * it under the terms of the GNU General Public License as published by
00010  * the Free Software Foundation; either version 2 of the License, or
00011  * (at your option) any later version.
00012  *
00013  * This program is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00016  * GNU General Public License for more details.
00017  * 
00018  * You should have received a copy of the GNU General Public License
00019  * along with this program; if not, write to the Free Software
00020  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00021  *
00022  */
00023 
00024 #include <config.h>
00025 #include "dbus-connection.h"
00026 #include "dbus-list.h"
00027 #include "dbus-timeout.h"
00028 #include "dbus-transport.h"
00029 #include "dbus-watch.h"
00030 #include "dbus-connection-internal.h"
00031 #include "dbus-list.h"
00032 #include "dbus-hash.h"
00033 #include "dbus-message-internal.h"
00034 #include "dbus-message-handler.h"
00035 #include "dbus-threads.h"
00036 #include "dbus-protocol.h"
00037 #include "dbus-dataslot.h"
00038 
00039 #if 0
00040 #define CONNECTION_LOCK(connection)   do {                      \
00041     _dbus_verbose ("  LOCK: %s\n", _DBUS_FUNCTION_NAME);        \
00042     dbus_mutex_lock ((connection)->mutex);                      \
00043   } while (0)
00044 #define CONNECTION_UNLOCK(connection) do {                      \
00045     _dbus_verbose ("  UNLOCK: %s\n", _DBUS_FUNCTION_NAME);      \
00046     dbus_mutex_unlock ((connection)->mutex);                    \
00047   } while (0)
00048 #else
00049 #define CONNECTION_LOCK(connection)    dbus_mutex_lock ((connection)->mutex)
00050 #define CONNECTION_UNLOCK(connection)  dbus_mutex_unlock ((connection)->mutex)
00051 #endif
00052 
00126 #define DEFAULT_TIMEOUT_VALUE (15 * 1000)
00127 
00128 static dbus_bool_t _dbus_modify_sigpipe = TRUE;
00129 
00133 struct DBusConnection
00134 {
00135   DBusAtomic refcount; 
00137   DBusMutex *mutex; 
00139   dbus_bool_t dispatch_acquired; 
00140   DBusCondVar *dispatch_cond;    
00142   dbus_bool_t io_path_acquired;  
00143   DBusCondVar *io_path_cond;     
00145   DBusList *outgoing_messages; 
00146   DBusList *incoming_messages; 
00148   DBusMessage *message_borrowed; 
00149   DBusCondVar *message_returned_cond; 
00151   int n_outgoing;              
00152   int n_incoming;              
00154   DBusCounter *outgoing_counter; 
00156   DBusTransport *transport;    
00157   DBusWatchList *watches;      
00158   DBusTimeoutList *timeouts;   
00160   DBusHashTable *handler_table; 
00161   DBusList *filter_list;        
00163   DBusDataSlotList slot_list;   
00165   DBusHashTable *pending_replies;  
00167   dbus_uint32_t client_serial;       
00168   DBusList *disconnect_message_link; 
00170   DBusWakeupMainFunction wakeup_main_function; 
00171   void *wakeup_main_data; 
00172   DBusFreeFunction free_wakeup_main_data; 
00174   DBusDispatchStatusFunction dispatch_status_function; 
00175   void *dispatch_status_data; 
00176   DBusFreeFunction free_dispatch_status_data; 
00178   DBusDispatchStatus last_dispatch_status; 
00180   DBusList *link_cache; 
00183 };
00184 
00185 typedef struct
00186 {
00187   DBusConnection *connection;
00188   DBusMessageHandler *handler;
00189   DBusTimeout *timeout;
00190   int serial;
00191 
00192   DBusList *timeout_link; /* Preallocated timeout response */
00193   
00194   dbus_bool_t timeout_added;
00195   dbus_bool_t connection_added;
00196 } ReplyHandlerData;
00197 
00198 static void reply_handler_data_free (ReplyHandlerData *data);
00199 
00200 static void               _dbus_connection_remove_timeout_locked             (DBusConnection     *connection,
00201                                                                               DBusTimeout        *timeout);
00202 static DBusDispatchStatus _dbus_connection_get_dispatch_status_unlocked      (DBusConnection     *connection);
00203 static void               _dbus_connection_update_dispatch_status_and_unlock (DBusConnection     *connection,
00204                                                                               DBusDispatchStatus  new_status);
00205 
00206 
00207 
00213 void
00214 _dbus_connection_lock (DBusConnection *connection)
00215 {
00216   CONNECTION_LOCK (connection);
00217 }
00218 
00224 void
00225 _dbus_connection_unlock (DBusConnection *connection)
00226 {
00227   CONNECTION_UNLOCK (connection);
00228 }
00229 
00237 static void
00238 _dbus_connection_wakeup_mainloop (DBusConnection *connection)
00239 {
00240   if (connection->wakeup_main_function)
00241     (*connection->wakeup_main_function) (connection->wakeup_main_data);
00242 }
00243 
00244 #ifdef DBUS_BUILD_TESTS
00245 /* For now this function isn't used */
00255 dbus_bool_t
00256 _dbus_connection_queue_received_message (DBusConnection *connection,
00257                                          DBusMessage    *message)
00258 {
00259   DBusList *link;
00260 
00261   link = _dbus_list_alloc_link (message);
00262   if (link == NULL)
00263     return FALSE;
00264 
00265   dbus_message_ref (message);
00266   _dbus_connection_queue_received_message_link (connection, link);
00267 
00268   return TRUE;
00269 }
00270 #endif
00271 
00280 void
00281 _dbus_connection_queue_received_message_link (DBusConnection  *connection,
00282                                               DBusList        *link)
00283 {
00284   ReplyHandlerData *reply_handler_data;
00285   dbus_int32_t reply_serial;
00286   DBusMessage *message;
00287   
00288   _dbus_assert (_dbus_transport_get_is_authenticated (connection->transport));
00289   
00290   _dbus_list_append_link (&connection->incoming_messages,
00291                           link);
00292   message = link->data;
00293 
00294   /* If this is a reply we're waiting on, remove timeout for it */
00295   reply_serial = dbus_message_get_reply_serial (message);
00296   if (reply_serial != -1)
00297     {
00298       reply_handler_data = _dbus_hash_table_lookup_int (connection->pending_replies,
00299                                                         reply_serial);
00300       if (reply_handler_data != NULL)
00301         {
00302           if (reply_handler_data->timeout_added)
00303             _dbus_connection_remove_timeout_locked (connection,
00304                                                     reply_handler_data->timeout);
00305           reply_handler_data->timeout_added = FALSE;
00306         }
00307     }
00308   
00309   connection->n_incoming += 1;
00310 
00311   _dbus_connection_wakeup_mainloop (connection);
00312   
00313   _dbus_assert (dbus_message_get_name (message) != NULL);
00314   _dbus_verbose ("Message %p (%s) added to incoming queue %p, %d incoming\n",
00315                  message, dbus_message_get_name (message),
00316                  connection,
00317                  connection->n_incoming);
00318 }
00319 
00330 static void
00331 _dbus_connection_queue_synthesized_message_link (DBusConnection *connection,
00332                                                  DBusList *link)
00333 {
00334   _dbus_list_append_link (&connection->incoming_messages, link);
00335 
00336   connection->n_incoming += 1;
00337 
00338   _dbus_connection_wakeup_mainloop (connection);
00339   
00340   _dbus_verbose ("Synthesized message %p added to incoming queue %p, %d incoming\n",
00341                  link->data, connection, connection->n_incoming);
00342 }
00343 
00344 
00351 dbus_bool_t
00352 _dbus_connection_have_messages_to_send (DBusConnection *connection)
00353 {
00354   return connection->outgoing_messages != NULL;
00355 }
00356 
00364 DBusMessage*
00365 _dbus_connection_get_message_to_send (DBusConnection *connection)
00366 {
00367   return _dbus_list_get_last (&connection->outgoing_messages);
00368 }
00369 
00378 void
00379 _dbus_connection_message_sent (DBusConnection *connection,
00380                                DBusMessage    *message)
00381 {
00382   DBusList *link;
00383   
00384   _dbus_assert (_dbus_transport_get_is_authenticated (connection->transport));
00385   
00386   link = _dbus_list_get_last_link (&connection->outgoing_messages);
00387   _dbus_assert (link != NULL);
00388   _dbus_assert (link->data == message);
00389 
00390   /* Save this link in the link cache */
00391   _dbus_list_unlink (&connection->outgoing_messages,
00392                      link);
00393   _dbus_list_prepend_link (&connection->link_cache, link);
00394   
00395   connection->n_outgoing -= 1;
00396 
00397   _dbus_verbose ("Message %p (%s) removed from outgoing queue %p, %d left to send\n",
00398                  message, dbus_message_get_name (message),
00399                  connection, connection->n_outgoing);
00400 
00401   /* Save this link in the link cache also */
00402   _dbus_message_remove_size_counter (message, connection->outgoing_counter,
00403                                      &link);
00404   _dbus_list_prepend_link (&connection->link_cache, link);
00405   
00406   dbus_message_unref (message);
00407   
00408   if (connection->n_outgoing == 0)
00409     _dbus_transport_messages_pending (connection->transport,
00410                                       connection->n_outgoing);  
00411 }
00412 
00423 dbus_bool_t
00424 _dbus_connection_add_watch (DBusConnection *connection,
00425                             DBusWatch      *watch)
00426 {
00427   if (connection->watches) /* null during finalize */
00428     return _dbus_watch_list_add_watch (connection->watches,
00429                                        watch);
00430   else
00431     return FALSE;
00432 }
00433 
00442 void
00443 _dbus_connection_remove_watch (DBusConnection *connection,
00444                                DBusWatch      *watch)
00445 {
00446   if (connection->watches) /* null during finalize */
00447     _dbus_watch_list_remove_watch (connection->watches,
00448                                    watch);
00449 }
00450 
00460 void
00461 _dbus_connection_toggle_watch (DBusConnection *connection,
00462                                DBusWatch      *watch,
00463                                dbus_bool_t     enabled)
00464 {
00465   if (connection->watches) /* null during finalize */
00466     _dbus_watch_list_toggle_watch (connection->watches,
00467                                    watch, enabled);
00468 }
00469 
00481 dbus_bool_t
00482 _dbus_connection_add_timeout (DBusConnection *connection,
00483                               DBusTimeout    *timeout)
00484 {
00485  if (connection->timeouts) /* null during finalize */
00486     return _dbus_timeout_list_add_timeout (connection->timeouts,
00487                                            timeout);
00488   else
00489     return FALSE;  
00490 }
00491 
00500 void
00501 _dbus_connection_remove_timeout (DBusConnection *connection,
00502                                  DBusTimeout    *timeout)
00503 {
00504   if (connection->timeouts) /* null during finalize */
00505     _dbus_timeout_list_remove_timeout (connection->timeouts,
00506                                        timeout);
00507 }
00508 
00509 static void
00510 _dbus_connection_remove_timeout_locked (DBusConnection *connection,
00511                                         DBusTimeout    *timeout)
00512 {
00513   CONNECTION_LOCK (connection);
00514   _dbus_connection_remove_timeout (connection, timeout);
00515   CONNECTION_UNLOCK (connection);
00516 }
00517 
00527 void
00528 _dbus_connection_toggle_timeout (DBusConnection *connection,
00529                                  DBusTimeout      *timeout,
00530                                  dbus_bool_t     enabled)
00531 {
00532   if (connection->timeouts) /* null during finalize */
00533     _dbus_timeout_list_toggle_timeout (connection->timeouts,
00534                                        timeout, enabled);
00535 }
00536 
00544 void
00545 _dbus_connection_notify_disconnected (DBusConnection *connection)
00546 {
00547   if (connection->disconnect_message_link)
00548     {
00549       /* We haven't sent the disconnect message already */
00550       _dbus_connection_queue_synthesized_message_link (connection,
00551                                                        connection->disconnect_message_link);
00552       connection->disconnect_message_link = NULL;
00553     }
00554 }
00555 
00556 
00566 static dbus_bool_t
00567 _dbus_connection_acquire_io_path (DBusConnection *connection,
00568                                   int timeout_milliseconds)
00569 {
00570   dbus_bool_t res = TRUE;
00571 
00572   if (connection->io_path_acquired)
00573     {
00574       if (timeout_milliseconds != -1) 
00575         res = dbus_condvar_wait_timeout (connection->io_path_cond,
00576                                          connection->mutex,
00577                                          timeout_milliseconds);
00578       else
00579         dbus_condvar_wait (connection->io_path_cond, connection->mutex);
00580     }
00581   
00582   if (res)
00583     {
00584       _dbus_assert (!connection->io_path_acquired);
00585 
00586       connection->io_path_acquired = TRUE;
00587     }
00588   
00589   return res;
00590 }
00591 
00599 static void
00600 _dbus_connection_release_io_path (DBusConnection *connection)
00601 {
00602   _dbus_assert (connection->io_path_acquired);
00603 
00604   connection->io_path_acquired = FALSE;
00605   dbus_condvar_wake_one (connection->io_path_cond);
00606 }
00607 
00608 
00635 void
00636 _dbus_connection_do_iteration (DBusConnection *connection,
00637                                unsigned int    flags,
00638                                int             timeout_milliseconds)
00639 {
00640   if (connection->n_outgoing == 0)
00641     flags &= ~DBUS_ITERATION_DO_WRITING;
00642 
00643   if (_dbus_connection_acquire_io_path (connection,
00644                                         (flags & DBUS_ITERATION_BLOCK) ? timeout_milliseconds : 0))
00645     {
00646       _dbus_transport_do_iteration (connection->transport,
00647                                     flags, timeout_milliseconds);
00648       _dbus_connection_release_io_path (connection);
00649     }
00650 }
00651 
00661 DBusConnection*
00662 _dbus_connection_new_for_transport (DBusTransport *transport)
00663 {
00664   DBusConnection *connection;
00665   DBusWatchList *watch_list;
00666   DBusTimeoutList *timeout_list;
00667   DBusHashTable *handler_table, *pending_replies;
00668   DBusMutex *mutex;
00669   DBusCondVar *message_returned_cond;
00670   DBusCondVar *dispatch_cond;
00671   DBusCondVar *io_path_cond;
00672   DBusList *disconnect_link;
00673   DBusMessage *disconnect_message;
00674   DBusCounter *outgoing_counter;
00675   
00676   watch_list = NULL;
00677   connection = NULL;
00678   handler_table = NULL;
00679   pending_replies = NULL;
00680   timeout_list = NULL;
00681   mutex = NULL;
00682   message_returned_cond = NULL;
00683   dispatch_cond = NULL;
00684   io_path_cond = NULL;
00685   disconnect_link = NULL;
00686   disconnect_message = NULL;
00687   outgoing_counter = NULL;
00688   
00689   watch_list = _dbus_watch_list_new ();
00690   if (watch_list == NULL)
00691     goto error;
00692 
00693   timeout_list = _dbus_timeout_list_new ();
00694   if (timeout_list == NULL)
00695     goto error;
00696   
00697   handler_table =
00698     _dbus_hash_table_new (DBUS_HASH_STRING,
00699                           dbus_free, NULL);
00700   if (handler_table == NULL)
00701     goto error;
00702 
00703   pending_replies =
00704     _dbus_hash_table_new (DBUS_HASH_INT,
00705                           NULL, (DBusFreeFunction)reply_handler_data_free);
00706   if (pending_replies == NULL)
00707     goto error;
00708   
00709   connection = dbus_new0 (DBusConnection, 1);
00710   if (connection == NULL)
00711     goto error;
00712 
00713   mutex = dbus_mutex_new ();
00714   if (mutex == NULL)
00715     goto error;
00716   
00717   message_returned_cond = dbus_condvar_new ();
00718   if (message_returned_cond == NULL)
00719     goto error;
00720   
00721   dispatch_cond = dbus_condvar_new ();
00722   if (dispatch_cond == NULL)
00723     goto error;
00724   
00725   io_path_cond = dbus_condvar_new ();
00726   if (io_path_cond == NULL)
00727     goto error;
00728 
00729   disconnect_message = dbus_message_new (DBUS_MESSAGE_LOCAL_DISCONNECT, NULL);
00730   if (disconnect_message == NULL)
00731     goto error;
00732 
00733   disconnect_link = _dbus_list_alloc_link (disconnect_message);
00734   if (disconnect_link == NULL)
00735     goto error;
00736 
00737   outgoing_counter = _dbus_counter_new ();
00738   if (outgoing_counter == NULL)
00739     goto error;
00740   
00741   if (_dbus_modify_sigpipe)
00742     _dbus_disable_sigpipe ();
00743   
00744   connection->refcount.value = 1;
00745   connection->mutex = mutex;
00746   connection->dispatch_cond = dispatch_cond;
00747   connection->io_path_cond = io_path_cond;
00748   connection->message_returned_cond = message_returned_cond;
00749   connection->transport = transport;
00750   connection->watches = watch_list;
00751   connection->timeouts = timeout_list;
00752   connection->handler_table = handler_table;
00753   connection->pending_replies = pending_replies;
00754   connection->outgoing_counter = outgoing_counter;
00755   connection->filter_list = NULL;
00756   connection->last_dispatch_status = DBUS_DISPATCH_COMPLETE; /* so we're notified first time there's data */
00757   
00758   _dbus_data_slot_list_init (&connection->slot_list);
00759 
00760   connection->client_serial = 1;
00761 
00762   connection->disconnect_message_link = disconnect_link;
00763   
00764   if (!_dbus_transport_set_connection (transport, connection))
00765     goto error;
00766 
00767   _dbus_transport_ref (transport);  
00768   
00769   return connection;
00770   
00771  error:
00772   if (disconnect_message != NULL)
00773     dbus_message_unref (disconnect_message);
00774   
00775   if (disconnect_link != NULL)
00776     _dbus_list_free_link (disconnect_link);
00777   
00778   if (io_path_cond != NULL)
00779     dbus_condvar_free (io_path_cond);
00780   
00781   if (dispatch_cond != NULL)
00782     dbus_condvar_free (dispatch_cond);
00783   
00784   if (message_returned_cond != NULL)
00785     dbus_condvar_free (message_returned_cond);
00786   
00787   if (mutex != NULL)
00788     dbus_mutex_free (mutex);
00789 
00790   if (connection != NULL)
00791     dbus_free (connection);
00792 
00793   if (handler_table)
00794     _dbus_hash_table_unref (handler_table);
00795 
00796   if (pending_replies)
00797     _dbus_hash_table_unref (pending_replies);
00798   
00799   if (watch_list)
00800     _dbus_watch_list_free (watch_list);
00801 
00802   if (timeout_list)
00803     _dbus_timeout_list_free (timeout_list);
00804 
00805   if (outgoing_counter)
00806     _dbus_counter_unref (outgoing_counter);
00807   
00808   return NULL;
00809 }
00810 
00817 void
00818 _dbus_connection_ref_unlocked (DBusConnection *connection)
00819 {
00820 #ifdef DBUS_HAVE_ATOMIC_INT
00821   _dbus_atomic_inc (&connection->refcount);
00822 #else
00823   _dbus_assert (connection->refcount.value > 0);
00824   connection->refcount.value += 1;
00825 #endif
00826 }
00827 
00828 static dbus_uint32_t
00829 _dbus_connection_get_next_client_serial (DBusConnection *connection)
00830 {
00831   int serial;
00832 
00833   serial = connection->client_serial++;
00834 
00835   if (connection->client_serial < 0)
00836     connection->client_serial = 1;
00837   
00838   return serial;
00839 }
00840 
00852 void
00853 _dbus_connection_handler_destroyed_locked (DBusConnection     *connection,
00854                                            DBusMessageHandler *handler)
00855 {
00856   DBusHashIter iter;
00857   DBusList *link;
00858 
00859   CONNECTION_LOCK (connection);
00860   
00861   _dbus_hash_iter_init (connection->handler_table, &iter);
00862   while (_dbus_hash_iter_next (&iter))
00863     {
00864       DBusMessageHandler *h = _dbus_hash_iter_get_value (&iter);
00865 
00866       if (h == handler)
00867         _dbus_hash_iter_remove_entry (&iter);
00868     }
00869 
00870   link = _dbus_list_get_first_link (&connection->filter_list);
00871   while (link != NULL)
00872     {
00873       DBusMessageHandler *h = link->data;
00874       DBusList *next = _dbus_list_get_next_link (&connection->filter_list, link);
00875 
00876       if (h == handler)
00877         _dbus_list_remove_link (&connection->filter_list,
00878                                 link);
00879       
00880       link = next;
00881     }
00882   CONNECTION_UNLOCK (connection);
00883 }
00884 
00898 dbus_bool_t
00899 _dbus_connection_handle_watch (DBusWatch                   *watch,
00900                                unsigned int                 condition,
00901                                void                        *data)
00902 {
00903   DBusConnection *connection;
00904   dbus_bool_t retval;
00905   DBusDispatchStatus status;
00906 
00907   connection = data;
00908   
00909   CONNECTION_LOCK (connection);
00910   _dbus_connection_acquire_io_path (connection, -1);
00911   retval = _dbus_transport_handle_watch (connection->transport,
00912                                          watch, condition);
00913   _dbus_connection_release_io_path (connection);
00914 
00915   status = _dbus_connection_get_dispatch_status_unlocked (connection);
00916 
00917   /* this calls out to user code */
00918   _dbus_connection_update_dispatch_status_and_unlock (connection, status);
00919   
00920   return retval;
00921 }
00922 
00947 DBusConnection*
00948 dbus_connection_open (const char     *address,
00949                       DBusError      *error)
00950 {
00951   DBusConnection *connection;
00952   DBusTransport *transport;
00953 
00954   _dbus_return_val_if_fail (address != NULL, NULL);
00955   _dbus_return_val_if_error_is_set (error, NULL);
00956   
00957   transport = _dbus_transport_open (address, error);
00958   if (transport == NULL)
00959     {
00960       _DBUS_ASSERT_ERROR_IS_SET (error);
00961       return NULL;
00962     }
00963   
00964   connection = _dbus_connection_new_for_transport (transport);
00965 
00966   _dbus_transport_unref (transport);
00967   
00968   if (connection == NULL)
00969     {
00970       dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
00971       return NULL;
00972     }
00973   
00974   return connection;
00975 }
00976 
00982 void
00983 dbus_connection_ref (DBusConnection *connection)
00984 {
00985   _dbus_return_if_fail (connection != NULL);
00986 
00987   /* The connection lock is better than the global
00988    * lock in the atomic increment fallback
00989    */
00990   
00991 #ifdef DBUS_HAVE_ATOMIC_INT
00992   _dbus_atomic_inc (&connection->refcount);
00993 #else
00994   CONNECTION_LOCK (connection);
00995   _dbus_assert (connection->refcount.value > 0);
00996 
00997   connection->refcount.value += 1;
00998   CONNECTION_UNLOCK (connection);
00999 #endif
01000 }
01001 
01002 static void
01003 free_outgoing_message (void *element,
01004                        void *data)
01005 {
01006   DBusMessage *message = element;
01007   DBusConnection *connection = data;
01008 
01009   _dbus_message_remove_size_counter (message,
01010                                      connection->outgoing_counter,
01011                                      NULL);
01012   dbus_message_unref (message);
01013 }
01014 
01015 /* This is run without the mutex held, but after the last reference
01016  * to the connection has been dropped we should have no thread-related
01017  * problems
01018  */
01019 static void
01020 _dbus_connection_last_unref (DBusConnection *connection)
01021 {
01022   DBusHashIter iter;
01023   DBusList *link;
01024 
01025   _dbus_verbose ("Finalizing connection %p\n", connection);
01026   
01027   _dbus_assert (connection->refcount.value == 0);
01028   
01029   /* You have to disconnect the connection before unref:ing it. Otherwise
01030    * you won't get the disconnected message.
01031    */
01032   _dbus_assert (!_dbus_transport_get_is_connected (connection->transport));
01033 
01034   /* ---- We're going to call various application callbacks here, hope it doesn't break anything... */
01035   dbus_connection_set_dispatch_status_function (connection, NULL, NULL, NULL);
01036   dbus_connection_set_wakeup_main_function (connection, NULL, NULL, NULL);
01037   dbus_connection_set_unix_user_function (connection, NULL, NULL, NULL);
01038   
01039   _dbus_watch_list_free (connection->watches);
01040   connection->watches = NULL;
01041   
01042   _dbus_timeout_list_free (connection->timeouts);
01043   connection->timeouts = NULL;
01044 
01045   _dbus_data_slot_list_free (&connection->slot_list);
01046   /* ---- Done with stuff that invokes application callbacks */
01047   
01048   _dbus_hash_iter_init (connection->handler_table, &iter);
01049   while (_dbus_hash_iter_next (&iter))
01050     {
01051       DBusMessageHandler *h = _dbus_hash_iter_get_value (&iter);
01052       
01053       _dbus_message_handler_remove_connection (h, connection);
01054     }
01055   
01056   link = _dbus_list_get_first_link (&connection->filter_list);
01057   while (link != NULL)
01058     {
01059       DBusMessageHandler *h = link->data;
01060       DBusList *next = _dbus_list_get_next_link (&connection->filter_list, link);
01061       
01062       _dbus_message_handler_remove_connection (h, connection);
01063       
01064       link = next;
01065     }
01066 
01067   _dbus_hash_table_unref (connection->handler_table);
01068   connection->handler_table = NULL;
01069 
01070   _dbus_hash_table_unref (connection->pending_replies);
01071   connection->pending_replies = NULL;
01072   
01073   _dbus_list_clear (&connection->filter_list);
01074   
01075   _dbus_list_foreach (&connection->outgoing_messages,
01076                       free_outgoing_message,
01077                       connection);
01078   _dbus_list_clear (&connection->outgoing_messages);
01079   
01080   _dbus_list_foreach (&connection->incoming_messages,
01081                       (DBusForeachFunction) dbus_message_unref,
01082                       NULL);
01083   _dbus_list_clear (&connection->incoming_messages);
01084 
01085   _dbus_counter_unref (connection->outgoing_counter);
01086   
01087   _dbus_transport_unref (connection->transport);
01088 
01089   if (connection->disconnect_message_link)
01090     {
01091       DBusMessage *message = connection->disconnect_message_link->data;
01092       dbus_message_unref (message);
01093       _dbus_list_free_link (connection->disconnect_message_link);
01094     }
01095 
01096   _dbus_list_clear (&connection->link_cache);
01097   
01098   dbus_condvar_free (connection->dispatch_cond);
01099   dbus_condvar_free (connection->io_path_cond);
01100   dbus_condvar_free (connection->message_returned_cond);  
01101   
01102   dbus_mutex_free (connection->mutex);
01103   
01104   dbus_free (connection);
01105 }
01106 
01118 void
01119 dbus_connection_unref (DBusConnection *connection)
01120 {
01121   dbus_bool_t last_unref;
01122 
01123   _dbus_return_if_fail (connection != NULL);
01124 
01125   /* The connection lock is better than the global
01126    * lock in the atomic increment fallback
01127    */
01128   
01129 #ifdef DBUS_HAVE_ATOMIC_INT
01130   last_unref = (_dbus_atomic_dec (&connection->refcount) == 1);
01131 #else
01132   CONNECTION_LOCK (connection);
01133   
01134   _dbus_assert (connection->refcount.value > 0);
01135 
01136   connection->refcount.value -= 1;
01137   last_unref = (connection->refcount.value == 0);
01138 
01139 #if 0
01140   printf ("unref() connection %p count = %d\n", connection, connection->refcount.value);
01141 #endif
01142   
01143   CONNECTION_UNLOCK (connection);
01144 #endif
01145   
01146   if (last_unref)
01147     _dbus_connection_last_unref (connection);
01148 }
01149 
01160 void
01161 dbus_connection_disconnect (DBusConnection *connection)
01162 {
01163   _dbus_return_if_fail (connection != NULL);
01164   
01165   CONNECTION_LOCK (connection);
01166   _dbus_transport_disconnect (connection->transport);
01167   CONNECTION_UNLOCK (connection);
01168 }
01169 
01170 static dbus_bool_t
01171 _dbus_connection_get_is_connected_unlocked (DBusConnection *connection)
01172 {
01173   return _dbus_transport_get_is_connected (connection->transport);
01174 }
01175 
01186 dbus_bool_t
01187 dbus_connection_get_is_connected (DBusConnection *connection)
01188 {
01189   dbus_bool_t res;
01190 
01191   _dbus_return_val_if_fail (connection != NULL, FALSE);
01192   
01193   CONNECTION_LOCK (connection);
01194   res = _dbus_connection_get_is_connected_unlocked (connection);
01195   CONNECTION_UNLOCK (connection);
01196   
01197   return res;
01198 }
01199 
01208 dbus_bool_t
01209 dbus_connection_get_is_authenticated (DBusConnection *connection)
01210 {
01211   dbus_bool_t res;
01212 
01213   _dbus_return_val_if_fail (connection != NULL, FALSE);
01214   
01215   CONNECTION_LOCK (connection);
01216   res = _dbus_transport_get_is_authenticated (connection->transport);
01217   CONNECTION_UNLOCK (connection);
01218   
01219   return res;
01220 }
01221 
01222 struct DBusPreallocatedSend
01223 {
01224   DBusConnection *connection;
01225   DBusList *queue_link;
01226   DBusList *counter_link;
01227 };
01228 
01229 static DBusPreallocatedSend*
01230 _dbus_connection_preallocate_send_unlocked (DBusConnection *connection)
01231 {
01232   DBusPreallocatedSend *preallocated;
01233 
01234   _dbus_return_val_if_fail (connection != NULL, NULL);
01235   
01236   preallocated = dbus_new (DBusPreallocatedSend, 1);
01237   if (preallocated == NULL)
01238     return NULL;
01239 
01240   if (connection->link_cache != NULL)
01241     {
01242       preallocated->queue_link =
01243         _dbus_list_pop_first_link (&connection->link_cache);
01244       preallocated->queue_link->data = NULL;
01245     }
01246   else
01247     {
01248       preallocated->queue_link = _dbus_list_alloc_link (NULL);
01249       if (preallocated->queue_link == NULL)
01250         goto failed_0;
01251     }
01252   
01253   if (connection->link_cache != NULL)
01254     {
01255       preallocated->counter_link =
01256         _dbus_list_pop_first_link (&connection->link_cache);
01257       preallocated->counter_link->data = connection->outgoing_counter;
01258     }
01259   else
01260     {
01261       preallocated->counter_link = _dbus_list_alloc_link (connection->outgoing_counter);
01262       if (preallocated->counter_link == NULL)
01263         goto failed_1;
01264     }
01265 
01266   _dbus_counter_ref (preallocated->counter_link->data);
01267 
01268   preallocated->connection = connection;
01269   
01270   return preallocated;
01271   
01272  failed_1:
01273   _dbus_list_free_link (preallocated->queue_link);
01274  failed_0:
01275   dbus_free (preallocated);
01276   
01277   return NULL;
01278 }
01279 
01289 DBusPreallocatedSend*
01290 dbus_connection_preallocate_send (DBusConnection *connection)
01291 {
01292   DBusPreallocatedSend *preallocated;
01293 
01294   _dbus_return_val_if_fail (connection != NULL, NULL);
01295 
01296   CONNECTION_LOCK (connection);
01297   
01298   preallocated =
01299     _dbus_connection_preallocate_send_unlocked (connection);
01300 
01301   CONNECTION_UNLOCK (connection);
01302 
01303   return preallocated;
01304 }
01305 
01315 void
01316 dbus_connection_free_preallocated_send (DBusConnection       *connection,
01317                                         DBusPreallocatedSend *preallocated)
01318 {
01319   _dbus_return_if_fail (connection != NULL);
01320   _dbus_return_if_fail (preallocated != NULL);  
01321   _dbus_return_if_fail (connection == preallocated->connection);
01322 
01323   _dbus_list_free_link (preallocated->queue_link);
01324   _dbus_counter_unref (preallocated->counter_link->data);
01325   _dbus_list_free_link (preallocated->counter_link);
01326   dbus_free (preallocated);
01327 }
01328 
01329 static void
01330 _dbus_connection_send_preallocated_unlocked (DBusConnection       *connection,
01331                                              DBusPreallocatedSend *preallocated,
01332                                              DBusMessage          *message,
01333                                              dbus_uint32_t        *client_serial)
01334 {
01335   dbus_uint32_t serial;
01336 
01337   preallocated->queue_link->data = message;
01338   _dbus_list_prepend_link (&connection->outgoing_messages,
01339                            preallocated->queue_link);
01340 
01341   _dbus_message_add_size_counter_link (message,
01342                                        preallocated->counter_link);
01343 
01344   dbus_free (preallocated);
01345   preallocated = NULL;
01346   
01347   dbus_message_ref (message);
01348   
01349   connection->n_outgoing += 1;
01350 
01351   _dbus_verbose ("Message %p (%s) added to outgoing queue %p, %d pending to send\n",
01352                  message,
01353                  dbus_message_get_name (message),
01354                  connection,
01355                  connection->n_outgoing);
01356 
01357   if (dbus_message_get_serial (message) == 0)
01358     {
01359       serial = _dbus_connection_get_next_client_serial (connection);
01360       _dbus_message_set_serial (message, serial);
01361       if (client_serial)
01362         *client_serial = serial;
01363     }
01364   else
01365     {
01366       if (client_serial)
01367         *client_serial = dbus_message_get_serial (message);
01368     }
01369   
01370   _dbus_message_lock (message);
01371 
01372   if (connection->n_outgoing == 1)
01373     _dbus_transport_messages_pending (connection->transport,
01374                                       connection->n_outgoing);
01375   
01376   _dbus_connection_wakeup_mainloop (connection);
01377 }
01378 
01391 void
01392 dbus_connection_send_preallocated (DBusConnection       *connection,
01393                                    DBusPreallocatedSend *preallocated,
01394                                    DBusMessage          *message,
01395                                    dbus_uint32_t        *client_serial)
01396 {
01397   _dbus_return_if_fail (connection != NULL);
01398   _dbus_return_if_fail (preallocated != NULL);
01399   _dbus_return_if_fail (message != NULL);
01400   _dbus_return_if_fail (preallocated->connection == connection);
01401   _dbus_return_if_fail (dbus_message_get_name (message) != NULL);
01402   
01403   CONNECTION_LOCK (connection);
01404   _dbus_connection_send_preallocated_unlocked (connection,
01405                                                preallocated,
01406                                                message, client_serial);
01407   CONNECTION_UNLOCK (connection);  
01408 }
01409 
01428 dbus_bool_t
01429 dbus_connection_send (DBusConnection *connection,
01430                       DBusMessage    *message,
01431                       dbus_uint32_t  *client_serial)
01432 {
01433   DBusPreallocatedSend *preallocated;
01434 
01435   _dbus_return_val_if_fail (connection != NULL, FALSE);
01436   _dbus_return_val_if_fail (message != NULL, FALSE);
01437 
01438   CONNECTION_LOCK (connection);
01439   
01440   preallocated = _dbus_connection_preallocate_send_unlocked (connection);
01441   if (preallocated == NULL)
01442     {
01443       CONNECTION_UNLOCK (connection);
01444       return FALSE;
01445     }
01446   else
01447     {
01448       _dbus_connection_send_preallocated_unlocked (connection,
01449                                                    preallocated,
01450                                                    message,
01451                                                    client_serial);
01452       CONNECTION_UNLOCK (connection);
01453       return TRUE;
01454     }
01455 }
01456 
01457 static dbus_bool_t
01458 reply_handler_timeout (void *data)
01459 {
01460   DBusConnection *connection;
01461   ReplyHandlerData *reply_handler_data = data;
01462   DBusDispatchStatus status;
01463 
01464   connection = reply_handler_data->connection;
01465   
01466   CONNECTION_LOCK (connection);
01467   if (reply_handler_data->timeout_link)
01468     {
01469       _dbus_connection_queue_synthesized_message_link (connection,
01470                                                        reply_handler_data->timeout_link);
01471       reply_handler_data->timeout_link = NULL;
01472     }
01473 
01474   _dbus_connection_remove_timeout (connection,
01475                                    reply_handler_data->timeout);
01476   reply_handler_data->timeout_added = FALSE;
01477 
01478   status = _dbus_connection_get_dispatch_status_unlocked (connection);
01479 
01480   /* Unlocks, and calls out to user code */
01481   _dbus_connection_update_dispatch_status_and_unlock (connection, status);
01482   
01483   return TRUE;
01484 }
01485 
01486 static void
01487 reply_handler_data_free (ReplyHandlerData *data)
01488 {
01489   if (!data)
01490     return;
01491 
01492   if (data->timeout_added)
01493     _dbus_connection_remove_timeout_locked (data->connection,
01494                                             data->timeout);
01495 
01496   if (data->connection_added)
01497     _dbus_message_handler_remove_connection (data->handler,
01498                                              data->connection);
01499 
01500   if (data->timeout_link)
01501     {
01502       dbus_message_unref ((DBusMessage *)data->timeout_link->data);
01503       _dbus_list_free_link (data->timeout_link);
01504     }
01505   
01506   dbus_message_handler_unref (data->handler);
01507   
01508   dbus_free (data);
01509 }
01510 
01546 dbus_bool_t
01547 dbus_connection_send_with_reply (DBusConnection     *connection,
01548                                  DBusMessage        *message,
01549                                  DBusMessageHandler *reply_handler,
01550                                  int                 timeout_milliseconds)
01551 {
01552   DBusTimeout *timeout;
01553   ReplyHandlerData *data;
01554   DBusMessage *reply;
01555   DBusList *reply_link;
01556   dbus_int32_t serial = -1;
01557 
01558   _dbus_return_val_if_fail (connection != NULL, FALSE);
01559   _dbus_return_val_if_fail (message != NULL, FALSE);
01560   _dbus_return_val_if_fail (reply_handler != NULL, FALSE);
01561   _dbus_return_val_if_fail (timeout_milliseconds >= 0 || timeout_milliseconds == -1, FALSE);
01562   
01563   if (timeout_milliseconds == -1)
01564     timeout_milliseconds = DEFAULT_TIMEOUT_VALUE;
01565 
01566   data = dbus_new0 (ReplyHandlerData, 1);
01567 
01568   if (!data)
01569     return FALSE;
01570   
01571   timeout = _dbus_timeout_new (timeout_milliseconds, reply_handler_timeout,
01572                                data, NULL);
01573 
01574   if (!timeout)
01575     {
01576       reply_handler_data_free (data);
01577       return FALSE;
01578     }
01579 
01580   CONNECTION_LOCK (connection);
01581   
01582   /* Add timeout */
01583   if (!_dbus_connection_add_timeout (connection, timeout))
01584     {
01585       reply_handler_data_free (data);
01586       _dbus_timeout_unref (timeout);
01587       CONNECTION_UNLOCK (connection);
01588       return FALSE;
01589     }
01590 
01591   /* The connection now owns the reference to the timeout. */
01592   _dbus_timeout_unref (timeout);
01593   
01594   data->timeout_added = TRUE;
01595   data->timeout = timeout;
01596   data->connection = connection;
01597   
01598   if (!_dbus_message_handler_add_connection (reply_handler, connection))
01599     {
01600       CONNECTION_UNLOCK (connection);
01601       reply_handler_data_free (data);
01602       return FALSE;
01603     }
01604   data->connection_added = TRUE;
01605   
01606   /* Assign a serial to the message */
01607   if (dbus_message_get_serial (message) == 0)
01608     {
01609       serial = _dbus_connection_get_next_client_serial (connection);
01610       _dbus_message_set_serial (message, serial);
01611     }
01612 
01613   data->handler = reply_handler;
01614   data->serial = serial;
01615 
01616   dbus_message_handler_ref (reply_handler);
01617 
01618   reply = dbus_message_new_error_reply (message, DBUS_ERROR_NO_REPLY,
01619                                         "No reply within specified time");
01620   if (!reply)
01621     {
01622       CONNECTION_UNLOCK (connection);
01623       reply_handler_data_free (data);
01624       return FALSE;
01625     }
01626 
01627   reply_link = _dbus_list_alloc_link (reply);
01628   if (!reply)
01629     {
01630       CONNECTION_UNLOCK (connection);
01631       dbus_message_unref (reply);
01632       reply_handler_data_free (data);
01633       return FALSE;
01634     }
01635 
01636   data->timeout_link = reply_link;
01637   
01638   /* Insert the serial in the pending replies hash. */
01639   if (!_dbus_hash_table_insert_int (connection->pending_replies, serial, data))
01640     {
01641       CONNECTION_UNLOCK (connection);
01642       reply_handler_data_free (data);      
01643       return FALSE;
01644     }
01645 
01646   CONNECTION_UNLOCK (connection);
01647   
01648   if (!dbus_connection_send (connection, message, NULL))
01649     {
01650       /* This will free the handler data too */
01651       _dbus_hash_table_remove_int (connection->pending_replies, serial);
01652       return FALSE;
01653     }
01654 
01655   return TRUE;
01656 }
01657 
01658 
01659 static DBusMessage*
01660 check_for_reply_unlocked (DBusConnection *connection,
01661                           dbus_uint32_t   client_serial)
01662 {
01663   DBusList *link;
01664   
01665   link = _dbus_list_get_first_link (&connection->incoming_messages);
01666 
01667   while (link != NULL)
01668     {
01669       DBusMessage *reply = link->data;
01670 
01671       if (dbus_message_get_reply_serial (reply) == client_serial)
01672         {
01673           _dbus_list_remove_link (&connection->incoming_messages, link);
01674           connection->n_incoming  -= 1;
01675           dbus_message_ref (reply);
01676           return reply;
01677         }
01678       link = _dbus_list_get_next_link (&connection->incoming_messages, link);
01679     }
01680 
01681   return NULL;
01682 }
01683 
01705 DBusMessage *
01706 dbus_connection_send_with_reply_and_block (DBusConnection     *connection,
01707                                            DBusMessage        *message,
01708                                            int                 timeout_milliseconds,
01709                                            DBusError          *error)
01710 {
01711   dbus_uint32_t client_serial;
01712   long start_tv_sec, start_tv_usec;
01713   long end_tv_sec, end_tv_usec;
01714   long tv_sec, tv_usec;
01715   DBusDispatchStatus status;
01716 
01717   _dbus_return_val_if_fail (connection != NULL, NULL);
01718   _dbus_return_val_if_fail (message != NULL, NULL);
01719   _dbus_return_val_if_fail (timeout_milliseconds >= 0 || timeout_milliseconds == -1, FALSE);  
01720   _dbus_return_val_if_error_is_set (error, NULL);
01721   
01722   if (timeout_milliseconds == -1)
01723     timeout_milliseconds = DEFAULT_TIMEOUT_VALUE;
01724 
01725   /* it would probably seem logical to pass in _DBUS_INT_MAX
01726    * for infinite timeout, but then math below would get
01727    * all overflow-prone, so smack that down.
01728    */
01729   if (timeout_milliseconds > _DBUS_ONE_HOUR_IN_MILLISECONDS * 6)
01730     timeout_milliseconds = _DBUS_ONE_HOUR_IN_MILLISECONDS * 6;
01731   
01732   if (!dbus_connection_send (connection, message, &client_serial))
01733     {
01734       _DBUS_SET_OOM (error);
01735       return NULL;
01736     }
01737 
01738   message = NULL;
01739   
01740   /* Flush message queue */
01741   dbus_connection_flush (connection);
01742 
01743   CONNECTION_LOCK (connection);
01744 
01745   _dbus_get_current_time (&start_tv_sec, &start_tv_usec);
01746   end_tv_sec = start_tv_sec + timeout_milliseconds / 1000;
01747   end_tv_usec = start_tv_usec + (timeout_milliseconds % 1000) * 1000;
01748   end_tv_sec += end_tv_usec / _DBUS_USEC_PER_SECOND;
01749   end_tv_usec = end_tv_usec % _DBUS_USEC_PER_SECOND;
01750 
01751   _dbus_verbose ("dbus_connection_send_with_reply_and_block(): will block %d milliseconds for reply serial %u from %ld sec %ld usec to %ld sec %ld usec\n",
01752                  timeout_milliseconds,
01753                  client_serial,
01754                  start_tv_sec, start_tv_usec,
01755                  end_tv_sec, end_tv_usec);
01756   
01757   /* Now we wait... */
01758   /* THREAD TODO: This is busted. What if a dispatch() or pop_message
01759    * gets the message before we do?
01760    */
01761   /* always block at least once as we know we don't have the reply yet */
01762   _dbus_connection_do_iteration (connection,
01763                                  DBUS_ITERATION_DO_READING |
01764                                  DBUS_ITERATION_BLOCK,
01765                                  timeout_milliseconds);
01766 
01767  recheck_status:
01768 
01769   /* queue messages and get status */
01770   status = _dbus_connection_get_dispatch_status_unlocked (connection);
01771 
01772   if (status == DBUS_DISPATCH_DATA_REMAINS)
01773     {
01774       DBusMessage *reply;
01775       
01776       reply = check_for_reply_unlocked (connection, client_serial);
01777       if (reply != NULL)
01778         {          
01779           status = _dbus_connection_get_dispatch_status_unlocked (connection);
01780 
01781           _dbus_verbose ("dbus_connection_send_with_reply_and_block(): got reply %s\n",
01782                          dbus_message_get_name (reply));
01783 
01784           /* Unlocks, and calls out to user code */
01785           _dbus_connection_update_dispatch_status_and_unlock (connection, status);
01786           
01787           return reply;
01788         }
01789     }
01790   
01791   _dbus_get_current_time (&tv_sec, &tv_usec);
01792   
01793   if (tv_sec < start_tv_sec)
01794     _dbus_verbose ("dbus_connection_send_with_reply_and_block(): clock set backward\n");
01795   else if (connection->disconnect_message_link == NULL)
01796     _dbus_verbose ("dbus_connection_send_with_reply_and_block(): disconnected\n");
01797   else if (tv_sec < end_tv_sec ||
01798            (tv_sec == end_tv_sec && tv_usec < end_tv_usec))
01799     {
01800       timeout_milliseconds = (end_tv_sec - tv_sec) * 1000 +
01801         (end_tv_usec - tv_usec) / 1000;
01802       _dbus_verbose ("dbus_connection_send_with_reply_and_block(): %d milliseconds remain\n", timeout_milliseconds);
01803       _dbus_assert (timeout_milliseconds >= 0);
01804       
01805       if (status == DBUS_DISPATCH_NEED_MEMORY)
01806         {
01807           /* Try sleeping a bit, as we aren't sure we need to block for reading,
01808            * we may already have a reply in the buffer and just can't process
01809            * it.
01810            */
01811           _dbus_verbose ("dbus_connection_send_with_reply_and_block() waiting for more memory\n");
01812           
01813           if (timeout_milliseconds < 100)
01814             ; /* just busy loop */
01815           else if (timeout_milliseconds <= 1000)
01816             _dbus_sleep_milliseconds (timeout_milliseconds / 3);
01817           else
01818             _dbus_sleep_milliseconds (1000);
01819         }
01820       else
01821         {          
01822           /* block again, we don't have the reply buffered yet. */
01823           _dbus_connection_do_iteration (connection,
01824                                          DBUS_ITERATION_DO_READING |
01825                                          DBUS_ITERATION_BLOCK,
01826                                          timeout_milliseconds);
01827         }
01828 
01829       goto recheck_status;
01830     }
01831 
01832   _dbus_verbose ("dbus_connection_send_with_reply_and_block(): Waited %ld milliseconds and got no reply\n",
01833                  (tv_sec - start_tv_sec) * 1000 + (tv_usec - start_tv_usec) / 1000);
01834   
01835   if (dbus_connection_get_is_connected (connection))
01836     dbus_set_error (error, DBUS_ERROR_NO_REPLY, "Message did not receive a reply");
01837   else
01838     dbus_set_error (error, DBUS_ERROR_DISCONNECTED, "Disconnected prior to receiving a reply");
01839 
01840   /* unlocks and calls out to user code */
01841   _dbus_connection_update_dispatch_status_and_unlock (connection, status);
01842 
01843   return NULL;
01844 }
01845 
01851 void
01852 dbus_connection_flush (DBusConnection *connection)
01853 {
01854   /* We have to specify DBUS_ITERATION_DO_READING here because
01855    * otherwise we could have two apps deadlock if they are both doing
01856    * a flush(), and the kernel buffers fill up. This could change the
01857    * dispatch status.
01858    */
01859   DBusDispatchStatus status;
01860 
01861   _dbus_return_if_fail (connection != NULL);
01862   
01863   CONNECTION_LOCK (connection);
01864   while (connection->n_outgoing > 0 &&
01865          _dbus_connection_get_is_connected_unlocked (connection))
01866     _dbus_connection_do_iteration (connection,
01867                                    DBUS_ITERATION_DO_READING |
01868                                    DBUS_ITERATION_DO_WRITING |
01869                                    DBUS_ITERATION_BLOCK,
01870                                    -1);
01871 
01872   status = _dbus_connection_get_dispatch_status_unlocked (connection);
01873 
01874   /* Unlocks and calls out to user code */
01875   _dbus_connection_update_dispatch_status_and_unlock (connection, status);
01876 }
01877 
01878 /* Call with mutex held. Will drop it while waiting and re-acquire
01879  * before returning
01880  */
01881 static void
01882 _dbus_connection_wait_for_borrowed (DBusConnection *connection)
01883 {
01884   _dbus_assert (connection->message_borrowed != NULL);
01885 
01886   while (connection->message_borrowed != NULL)
01887     dbus_condvar_wait (connection->message_returned_cond, connection->mutex);
01888 }
01889 
01904 DBusMessage*
01905 dbus_connection_borrow_message  (DBusConnection *connection)
01906 {
01907   DBusMessage *message;
01908   DBusDispatchStatus status;
01909 
01910   _dbus_return_val_if_fail (connection != NULL, NULL);
01911   
01912   /* this is called for the side effect that it queues
01913    * up any messages from the transport
01914    */
01915   status = dbus_connection_get_dispatch_status (connection);
01916   if (status != DBUS_DISPATCH_DATA_REMAINS)
01917     return NULL;
01918   
01919   CONNECTION_LOCK (connection);
01920 
01921   if (connection->message_borrowed != NULL)
01922     _dbus_connection_wait_for_borrowed (connection);
01923   
01924   message = _dbus_list_get_first (&connection->incoming_messages);
01925 
01926   if (message) 
01927     connection->message_borrowed = message;
01928   
01929   CONNECTION_UNLOCK (connection);
01930   return message;
01931 }
01932 
01940 void
01941 dbus_connection_return_message (DBusConnection *connection,
01942                                 DBusMessage    *message)
01943 {
01944   _dbus_return_if_fail (connection != NULL);
01945   _dbus_return_if_fail (message != NULL);
01946   
01947   CONNECTION_LOCK (connection);
01948   
01949   _dbus_assert (message == connection->message_borrowed);
01950   
01951   connection->message_borrowed = NULL;
01952   dbus_condvar_wake_all (connection->message_returned_cond);
01953   
01954   CONNECTION_UNLOCK (connection);
01955 }
01956 
01966 void
01967 dbus_connection_steal_borrowed_message (DBusConnection *connection,
01968                                         DBusMessage    *message)
01969 {
01970   DBusMessage *pop_message;
01971 
01972   _dbus_return_if_fail (connection != NULL);
01973   _dbus_return_if_fail (message != NULL);
01974   
01975   CONNECTION_LOCK (connection);
01976  
01977   _dbus_assert (message == connection->message_borrowed);
01978 
01979   pop_message = _dbus_list_pop_first (&connection->incoming_messages);
01980   _dbus_assert (message == pop_message);
01981   
01982   connection->n_incoming -= 1;
01983  
01984   _dbus_verbose ("Incoming message %p stolen from queue, %d incoming\n",
01985                  message, connection->n_incoming);
01986  
01987   connection->message_borrowed = NULL;
01988   dbus_condvar_wake_all (connection->message_returned_cond);
01989   
01990   CONNECTION_UNLOCK (connection);
01991 }
01992 
01993 /* See dbus_connection_pop_message, but requires the caller to own
01994  * the lock before calling. May drop the lock while running.
01995  */
01996 static DBusList*
01997 _dbus_connection_pop_message_link_unlocked (DBusConnection *connection)
01998 {
01999   if (connection->message_borrowed != NULL)
02000     _dbus_connection_wait_for_borrowed (connection);
02001   
02002   if (connection->n_incoming > 0)
02003     {
02004       DBusList *link;
02005 
02006       link = _dbus_list_pop_first_link (&connection->incoming_messages);
02007       connection->n_incoming -= 1;
02008 
02009       _dbus_verbose ("Message %p (%s) removed from incoming queue %p, %d incoming\n",
02010                      link->data, dbus_message_get_name (link->data),
02011                      connection, connection->n_incoming);
02012 
02013       return link;
02014     }
02015   else
02016     return NULL;
02017 }
02018 
02019 /* See dbus_connection_pop_message, but requires the caller to own
02020  * the lock before calling. May drop the lock while running.
02021  */
02022 static DBusMessage*
02023 _dbus_connection_pop_message_unlocked (DBusConnection *connection)
02024 {
02025   DBusList *link;
02026   
02027   link = _dbus_connection_pop_message_link_unlocked (connection);
02028 
02029   if (link != NULL)
02030     {
02031       DBusMessage *message;
02032       
02033       message = link->data;
02034       
02035       _dbus_list_free_link (link);
02036       
02037       return message;
02038     }
02039   else
02040     return NULL;
02041 }
02042 
02043 
02058 DBusMessage*
02059 dbus_connection_pop_message (DBusConnection *connection)
02060 {
02061   DBusMessage *message;
02062   DBusDispatchStatus status;
02063 
02064   /* this is called for the side effect that it queues
02065    * up any messages from the transport
02066    */
02067   status = dbus_connection_get_dispatch_status (connection);
02068   if (status != DBUS_DISPATCH_DATA_REMAINS)
02069     return NULL;
02070   
02071   CONNECTION_LOCK (connection);
02072 
02073   message = _dbus_connection_pop_message_unlocked (connection);
02074 
02075   _dbus_verbose ("Returning popped message %p\n", message);    
02076   
02077   CONNECTION_UNLOCK (connection);
02078   
02079   return message;
02080 }
02081 
02090 static void
02091 _dbus_connection_acquire_dispatch (DBusConnection *connection)
02092 {
02093   if (connection->dispatch_acquired)
02094     dbus_condvar_wait (connection->dispatch_cond, connection->mutex);
02095   _dbus_assert (!connection->dispatch_acquired);
02096 
02097   connection->dispatch_acquired = TRUE;
02098 }
02099 
02107 static void
02108 _dbus_connection_release_dispatch (DBusConnection *connection)
02109 {
02110   _dbus_assert (connection->dispatch_acquired);
02111 
02112   connection->dispatch_acquired = FALSE;
02113   dbus_condvar_wake_one (connection->dispatch_cond);
02114 }
02115 
02116 static void
02117 _dbus_connection_failed_pop (DBusConnection *connection,
02118                              DBusList       *message_link)
02119 {
02120   _dbus_list_prepend_link (&connection->incoming_messages,
02121                            message_link);
02122   connection->n_incoming += 1;
02123 }
02124 
02125 static DBusDispatchStatus
02126 _dbus_connection_get_dispatch_status_unlocked (DBusConnection *connection)
02127 {
02128   if (connection->n_incoming > 0)
02129     return DBUS_DISPATCH_DATA_REMAINS;
02130   else if (!_dbus_transport_queue_messages (connection->transport))
02131     return DBUS_DISPATCH_NEED_MEMORY;
02132   else
02133     {
02134       DBusDispatchStatus status;
02135       
02136       status = _dbus_transport_get_dispatch_status (connection->transport);
02137 
02138       if (status != DBUS_DISPATCH_COMPLETE)
02139         return status;
02140       else if (connection->n_incoming > 0)
02141         return DBUS_DISPATCH_DATA_REMAINS;
02142       else
02143         return DBUS_DISPATCH_COMPLETE;
02144     }
02145 }
02146 
02147 static void
02148 _dbus_connection_update_dispatch_status_and_unlock (DBusConnection    *connection,
02149                                                     DBusDispatchStatus new_status)
02150 {
02151   dbus_bool_t changed;
02152   DBusDispatchStatusFunction function;
02153   void *data;
02154 
02155   /* We have the lock */
02156 
02157   _dbus_connection_ref_unlocked (connection);
02158 
02159   changed = new_status != connection->last_dispatch_status;
02160 
02161   connection->last_dispatch_status = new_status;
02162 
02163   function = connection->dispatch_status_function;
02164   data = connection->dispatch_status_data;
02165 
02166   /* We drop the lock */
02167   CONNECTION_UNLOCK (connection);
02168   
02169   if (changed && function)
02170     {
02171       _dbus_verbose ("Notifying of change to dispatch status of %p now %d (%s)\n",
02172                      connection, new_status,
02173                      new_status == DBUS_DISPATCH_COMPLETE ? "complete" :
02174                      new_status == DBUS_DISPATCH_DATA_REMAINS ? "data remains" :
02175                      new_status == DBUS_DISPATCH_NEED_MEMORY ? "need memory" :
02176                      "???");
02177       (* function) (connection, new_status, data);      
02178     }
02179   
02180   dbus_connection_unref (connection);
02181 }
02182 
02191 DBusDispatchStatus
02192 dbus_connection_get_dispatch_status (DBusConnection *connection)
02193 {
02194   DBusDispatchStatus status;
02195 
02196   _dbus_return_val_if_fail (connection != NULL, DBUS_DISPATCH_COMPLETE);
02197   
02198   CONNECTION_LOCK (connection);
02199 
02200   status = _dbus_connection_get_dispatch_status_unlocked (connection);
02201   
02202   CONNECTION_UNLOCK (connection);
02203 
02204   return status;
02205 }
02206 
02221 DBusDispatchStatus
02222 dbus_connection_dispatch (DBusConnection *connection)
02223 {
02224   DBusMessageHandler *handler;
02225   DBusMessage *message;
02226   DBusList *link, *filter_list_copy, *message_link;
02227   DBusHandlerResult result;
02228   ReplyHandlerData *reply_handler_data;
02229   const char *name;
02230   dbus_int32_t reply_serial;
02231   DBusDispatchStatus status;
02232 
02233   _dbus_return_val_if_fail (connection != NULL, DBUS_DISPATCH_COMPLETE);
02234 
02235   CONNECTION_LOCK (connection);
02236   status = _dbus_connection_get_dispatch_status_unlocked (connection);
02237   if (status != DBUS_DISPATCH_DATA_REMAINS)
02238     {
02239       /* unlocks and calls out to user code */
02240       _dbus_connection_update_dispatch_status_and_unlock (connection, status);
02241       return status;
02242     }
02243   
02244   /* We need to ref the connection since the callback could potentially
02245    * drop the last ref to it
02246    */
02247   _dbus_connection_ref_unlocked (connection);
02248 
02249   _dbus_connection_acquire_dispatch (connection);
02250   
02251   /* This call may drop the lock during the execution (if waiting for
02252    * borrowed messages to be returned) but the order of message
02253    * dispatch if several threads call dispatch() is still
02254    * protected by the lock, since only one will get the lock, and that
02255    * one will finish the message dispatching
02256    */
02257   message_link = _dbus_connection_pop_message_link_unlocked (connection);
02258   if (message_link == NULL)
02259     {
02260       /* another thread dispatched our stuff */
02261 
02262       _dbus_connection_release_dispatch (connection);
02263 
02264       status = _dbus_connection_get_dispatch_status_unlocked (connection);
02265 
02266       _dbus_connection_update_dispatch_status_and_unlock (connection, status);
02267       
02268       dbus_connection_unref (connection);
02269       
02270       return status;
02271     }
02272 
02273   message = message_link->data;
02274   
02275   result = DBUS_HANDLER_RESULT_ALLOW_MORE_HANDLERS;
02276 
02277   reply_serial = dbus_message_get_reply_serial (message);
02278   reply_handler_data = _dbus_hash_table_lookup_int (connection->pending_replies,
02279                                                     reply_serial);
02280   
02281   if (!_dbus_list_copy (&connection->filter_list, &filter_list_copy))
02282     {
02283       _dbus_connection_release_dispatch (connection);
02284 
02285       _dbus_connection_failed_pop (connection, message_link);
02286 
02287       /* unlocks and calls user code */
02288       _dbus_connection_update_dispatch_status_and_unlock (connection,
02289                                                           DBUS_DISPATCH_NEED_MEMORY);
02290 
02291       dbus_connection_unref (connection);
02292       
02293       return DBUS_DISPATCH_NEED_MEMORY;
02294     }
02295   
02296   _dbus_list_foreach (&filter_list_copy,
02297                       (DBusForeachFunction)dbus_message_handler_ref,
02298                       NULL);
02299 
02300   /* We're still protected from dispatch() reentrancy here
02301    * since we acquired the dispatcher
02302    */
02303   CONNECTION_UNLOCK (connection);
02304   
02305   link = _dbus_list_get_first_link (&filter_list_copy);
02306   while (link != NULL)
02307     {
02308       DBusMessageHandler *handler = link->data;
02309       DBusList *next = _dbus_list_get_next_link (&filter_list_copy, link);
02310 
02311       _dbus_verbose ("  running filter on message %p\n", message);
02312       result = _dbus_message_handler_handle_message (handler, connection,
02313                                                      message);
02314 
02315       if (result == DBUS_HANDLER_RESULT_REMOVE_MESSAGE)
02316         break;
02317 
02318       link = next;
02319     }
02320 
02321   _dbus_list_foreach (&filter_list_copy,
02322                       (DBusForeachFunction)dbus_message_handler_unref,
02323                       NULL);
02324   _dbus_list_clear (&filter_list_copy);
02325   
02326   CONNECTION_LOCK (connection);
02327 
02328   /* Did a reply we were waiting on get filtered? */
02329   if (reply_handler_data && result == DBUS_HANDLER_RESULT_REMOVE_MESSAGE)
02330     {
02331       /* Queue the timeout immediately! */
02332       if (reply_handler_data->timeout_link)
02333         {
02334           _dbus_connection_queue_synthesized_message_link (connection,
02335                                                            reply_handler_data->timeout_link);
02336           reply_handler_data->timeout_link = NULL;
02337         }
02338       else
02339         {
02340           /* We already queued the timeout? Then it was filtered! */
02341           _dbus_warn ("The timeout error with reply serial %d was filtered, so the reply handler will never be called.\n", reply_serial);
02342         }
02343     }
02344   
02345   if (result == DBUS_HANDLER_RESULT_REMOVE_MESSAGE)
02346     goto out;
02347 
02348   if (reply_handler_data)
02349     {
02350       CONNECTION_UNLOCK (connection);
02351 
02352       _dbus_verbose ("  running reply handler on message %p\n", message);
02353       
02354       result = _dbus_message_handler_handle_message (reply_handler_data->handler,
02355                                                      connection, message);
02356       reply_handler_data_free (reply_handler_data);
02357       CONNECTION_LOCK (connection);
02358       goto out;
02359     }
02360   
02361   name = dbus_message_get_name (message);
02362   if (name != NULL)
02363     {
02364       handler = _dbus_hash_table_lookup_string (connection->handler_table,
02365                                                 name);
02366       if (handler != NULL)
02367         {
02368           /* We're still protected from dispatch() reentrancy here
02369            * since we acquired the dispatcher
02370            */
02371           CONNECTION_UNLOCK (connection);
02372 
02373           _dbus_verbose ("  running app handler on message %p (%s)\n",
02374                          message, dbus_message_get_name (message));
02375           
02376           result = _dbus_message_handler_handle_message (handler, connection,
02377                                                          message);
02378           CONNECTION_LOCK (connection);
02379           if (result == DBUS_HANDLER_RESULT_REMOVE_MESSAGE)
02380             goto out;
02381         }
02382     }
02383 
02384   _dbus_verbose ("  done dispatching %p (%s) on connection %p\n", message,
02385                  dbus_message_get_name (message), connection);
02386   
02387  out:
02388   _dbus_connection_release_dispatch (connection);
02389 
02390   _dbus_list_free_link (message_link);
02391   dbus_message_unref (message); /* don't want the message to count in max message limits
02392                                  * in computing dispatch status
02393                                  */
02394   
02395   status = _dbus_connection_get_dispatch_status_unlocked (connection);
02396 
02397   /* unlocks and calls user code */
02398   _dbus_connection_update_dispatch_status_and_unlock (connection, status);
02399   
02400   dbus_connection_unref (connection);
02401   
02402   return status;
02403 }
02404 
02463 dbus_bool_t
02464 dbus_connection_set_watch_functions (DBusConnection              *connection,
02465                                      DBusAddWatchFunction         add_function,
02466                                      DBusRemoveWatchFunction      remove_function,
02467                                      DBusWatchToggledFunction     toggled_function,
02468                                      void                        *data,
02469                                      DBusFreeFunction             free_data_function)
02470 {
02471   dbus_bool_t retval;
02472 
02473   _dbus_return_val_if_fail (connection != NULL, FALSE);
02474   
02475   CONNECTION_LOCK (connection);
02476   /* ref connection for slightly better reentrancy */
02477   _dbus_connection_ref_unlocked (connection);
02478 
02479   /* FIXME this can call back into user code, and we need to drop the
02480    * connection lock when it does.
02481    */
02482   retval = _dbus_watch_list_set_functions (connection->watches,
02483                                            add_function, remove_function,
02484                                            toggled_function,
02485                                            data, free_data_function);
02486   
02487   CONNECTION_UNLOCK (connection);
02488   /* drop our paranoid refcount */
02489   dbus_connection_unref (connection);
02490 
02491   return retval;
02492 }
02493 
02527 dbus_bool_t
02528 dbus_connection_set_timeout_functions   (DBusConnection            *connection,
02529                                          DBusAddTimeoutFunction     add_function,
02530                                          DBusRemoveTimeoutFunction  remove_function,
02531                                          DBusTimeoutToggledFunction toggled_function,
02532                                          void                      *data,
02533                                          DBusFreeFunction           free_data_function)
02534 {
02535   dbus_bool_t retval;
02536 
02537   _dbus_return_val_if_fail (connection != NULL, FALSE);
02538   
02539   CONNECTION_LOCK (connection);
02540   /* ref connection for slightly better reentrancy */
02541   _dbus_connection_ref_unlocked (connection);
02542   
02543   retval = _dbus_timeout_list_set_functions (connection->timeouts,
02544                                              add_function, remove_function,
02545                                              toggled_function,
02546                                              data, free_data_function);
02547   
02548   CONNECTION_UNLOCK (connection);
02549   /* drop our paranoid refcount */
02550   dbus_connection_unref (connection);
02551 
02552   return retval;
02553 }
02554 
02569 void
02570 dbus_connection_set_wakeup_main_function (DBusConnection            *connection,
02571                                           DBusWakeupMainFunction     wakeup_main_function,
02572                                           void                      *data,
02573                                           DBusFreeFunction           free_data_function)
02574 {
02575   void *old_data;
02576   DBusFreeFunction old_free_data;
02577 
02578   _dbus_return_if_fail (connection != NULL);
02579   
02580   CONNECTION_LOCK (connection);
02581   old_data = connection->wakeup_main_data;
02582   old_free_data = connection->free_wakeup_main_data;
02583 
02584   connection->wakeup_main_function = wakeup_main_function;
02585   connection->wakeup_main_data = data;
02586   connection->free_wakeup_main_data = free_data_function;
02587   
02588   CONNECTION_UNLOCK (connection);
02589 
02590   /* Callback outside the lock */
02591   if (old_free_data)
02592     (*old_free_data) (old_data);
02593 }
02594 
02611 void
02612 dbus_connection_set_dispatch_status_function (DBusConnection             *connection,
02613                                               DBusDispatchStatusFunction  function,
02614                                               void                       *data,
02615                                               DBusFreeFunction            free_data_function)
02616 {
02617   void *old_data;
02618   DBusFreeFunction old_free_data;
02619 
02620   _dbus_return_if_fail (connection != NULL);
02621   
02622   CONNECTION_LOCK (connection);
02623   old_data = connection->dispatch_status_data;
02624   old_free_data = connection->free_dispatch_status_data;
02625 
02626   connection->dispatch_status_function = function;
02627   connection->dispatch_status_data = data;
02628   connection->free_dispatch_status_data = free_data_function;
02629   
02630   CONNECTION_UNLOCK (connection);
02631 
02632   /* Callback outside the lock */
02633   if (old_free_data)
02634     (*old_free_data) (old_data);
02635 }
02636 
02648 dbus_bool_t
02649 dbus_connection_get_unix_user (DBusConnection *connection,
02650                                unsigned long  *uid)
02651 {
02652   dbus_bool_t result;
02653 
02654   _dbus_return_val_if_fail (connection != NULL, FALSE);
02655   _dbus_return_val_if_fail (uid != NULL, FALSE);
02656   
02657   CONNECTION_LOCK (connection);
02658 
02659   if (!_dbus_transport_get_is_authenticated (connection->transport))
02660     result = FALSE;
02661   else
02662     result = _dbus_transport_get_unix_user (connection->transport,
02663                                             uid);
02664   CONNECTION_UNLOCK (connection);
02665 
02666   return result;
02667 }
02668 
02685 void
02686 dbus_connection_set_unix_user_function (DBusConnection             *connection,
02687                                         DBusAllowUnixUserFunction   function,
02688                                         void                       *data,
02689                                         DBusFreeFunction            free_data_function)
02690 {
02691   void *old_data = NULL;
02692   DBusFreeFunction old_free_function = NULL;
02693 
02694   _dbus_return_if_fail (connection != NULL);
02695   
02696   CONNECTION_LOCK (connection);
02697   _dbus_transport_set_unix_user_function (connection->transport,
02698                                           function, data, free_data_function,
02699                                           &old_data, &old_free_function);
02700   CONNECTION_UNLOCK (connection);
02701 
02702   if (old_free_function != NULL)
02703     (* old_free_function) (old_data);    
02704 }
02705 
02725 dbus_bool_t
02726 dbus_connection_add_filter (DBusConnection      *connection,
02727                             DBusMessageHandler  *handler)
02728 {
02729   _dbus_return_val_if_fail (connection != NULL, FALSE);
02730   _dbus_return_val_if_fail (handler != NULL, FALSE);
02731 
02732   CONNECTION_LOCK (connection);
02733   if (!_dbus_message_handler_add_connection (handler, connection))
02734     {
02735       CONNECTION_UNLOCK (connection);
02736       return FALSE;
02737     }
02738 
02739   if (!_dbus_list_append (&connection->filter_list,
02740                           handler))
02741     {
02742       _dbus_message_handler_remove_connection (handler, connection);
02743       CONNECTION_UNLOCK (connection);
02744       return FALSE;
02745     }
02746 
02747   CONNECTION_UNLOCK (connection);
02748   return TRUE;
02749 }
02750 
02762 void
02763 dbus_connection_remove_filter (DBusConnection      *connection,
02764                                DBusMessageHandler  *handler)
02765 {
02766   _dbus_return_if_fail (connection != NULL);
02767   _dbus_return_if_fail (handler != NULL);
02768   
02769   CONNECTION_LOCK (connection);
02770   if (!_dbus_list_remove_last (&connection->filter_list, handler))
02771     {
02772       _dbus_warn ("Tried to remove a DBusConnection filter that had not been added\n");
02773       CONNECTION_UNLOCK (connection);
02774       return;
02775     }
02776 
02777   _dbus_message_handler_remove_connection (handler, connection);
02778 
02779   CONNECTION_UNLOCK (connection);
02780 }
02781 
02808 dbus_bool_t
02809 dbus_connection_register_handler (DBusConnection     *connection,
02810                                   DBusMessageHandler *handler,
02811                                   const char        **messages_to_handle,
02812                                   int                 n_messages)
02813 {
02814   int i;
02815 
02816   _dbus_return_val_if_fail (connection != NULL, FALSE);
02817   _dbus_return_val_if_fail (handler != NULL, FALSE);
02818   _dbus_return_val_if_fail (n_messages >= 0, FALSE);
02819   _dbus_return_val_if_fail (n_messages == 0 || messages_to_handle != NULL, FALSE);
02820   
02821   CONNECTION_LOCK (connection);
02822   i = 0;
02823   while (i < n_messages)
02824     {
02825       DBusHashIter iter;
02826       char *key;
02827 
02828       key = _dbus_strdup (messages_to_handle[i]);
02829       if (key == NULL)
02830         goto failed;
02831       
02832       if (!_dbus_hash_iter_lookup (connection->handler_table,
02833                                    key, TRUE,
02834                                    &iter))
02835         {
02836           dbus_free (key);
02837           goto failed;
02838         }
02839 
02840       if (_dbus_hash_iter_get_value (&iter) != NULL)
02841         {
02842           _dbus_warn ("Bug in application: attempted to register a second handler for %s\n",
02843                       messages_to_handle[i]);
02844           dbus_free (key); /* won't have replaced the old key with the new one */
02845           goto failed;
02846         }
02847 
02848       if (!_dbus_message_handler_add_connection (handler, connection))
02849         {
02850           _dbus_hash_iter_remove_entry (&iter);
02851           /* key has freed on nuking the entry */
02852           goto failed;
02853         }
02854       
02855       _dbus_hash_iter_set_value (&iter, handler);
02856 
02857       ++i;
02858     }
02859   
02860   CONNECTION_UNLOCK (connection);
02861   return TRUE;
02862   
02863  failed:
02864   /* unregister everything registered so far,
02865    * so we don't fail partially
02866    */
02867   dbus_connection_unregister_handler (connection,
02868                                       handler,
02869                                       messages_to_handle,
02870                                       i);
02871 
02872   CONNECTION_UNLOCK (connection);
02873   return FALSE;
02874 }
02875 
02886 void
02887 dbus_connection_unregister_handler (DBusConnection     *connection,
02888                                     DBusMessageHandler *handler,
02889                                     const char        **messages_to_handle,
02890                                     int                 n_messages)
02891 {
02892   int i;
02893 
02894   _dbus_return_if_fail (connection != NULL);
02895   _dbus_return_if_fail (handler != NULL);
02896   _dbus_return_if_fail (n_messages >= 0);
02897   _dbus_return_if_fail (n_messages == 0 || messages_to_handle != NULL);
02898   
02899   CONNECTION_LOCK (connection);
02900   i = 0;
02901   while (i < n_messages)
02902     {
02903       DBusHashIter iter;
02904 
02905       if (!_dbus_hash_iter_lookup (connection->handler_table,
02906                                    (char*) messages_to_handle[i], FALSE,
02907                                    &iter))
02908         {
02909           _dbus_warn ("Bug in application: attempted to unregister handler for %s which was not registered\n",
02910                       messages_to_handle[i]);
02911         }
02912       else if (_dbus_hash_iter_get_value (&iter) != handler)
02913         {
02914           _dbus_warn ("Bug in application: attempted to unregister handler for %s which was registered by a different handler\n",
02915                       messages_to_handle[i]);
02916         }
02917       else
02918         {
02919           _dbus_hash_iter_remove_entry (&iter);
02920           _dbus_message_handler_remove_connection (handler, connection);
02921         }
02922 
02923       ++i;
02924     }
02925 
02926   CONNECTION_UNLOCK (connection);
02927 }
02928 
02929 static DBusDataSlotAllocator slot_allocator;
02930 _DBUS_DEFINE_GLOBAL_LOCK (connection_slots);
02931 
02946 dbus_bool_t
02947 dbus_connection_allocate_data_slot (dbus_int32_t *slot_p)
02948 {
02949   return _dbus_data_slot_allocator_alloc (&slot_allocator,
02950                                           _DBUS_LOCK_NAME (connection_slots),
02951                                           slot_p);
02952 }
02953 
02965 void
02966 dbus_connection_free_data_slot (dbus_int32_t *slot_p)
02967 {
02968   _dbus_return_if_fail (*slot_p >= 0);
02969   
02970   _dbus_data_slot_allocator_free (&slot_allocator, slot_p);
02971 }
02972 
02986 dbus_bool_t
02987 dbus_connection_set_data (DBusConnection   *connection,
02988                           dbus_int32_t      slot,
02989                           void             *data,
02990                           DBusFreeFunction  free_data_func)
02991 {
02992   DBusFreeFunction old_free_func;
02993   void *old_data;
02994   dbus_bool_t retval;
02995 
02996   _dbus_return_val_if_fail (connection != NULL, FALSE);
02997   _dbus_return_val_if_fail (slot >= 0, FALSE);
02998   
02999   CONNECTION_LOCK (connection);
03000 
03001   retval = _dbus_data_slot_list_set (&slot_allocator,
03002                                      &connection->slot_list,
03003                                      slot, data, free_data_func,
03004                                      &old_free_func, &old_data);
03005   
03006   CONNECTION_UNLOCK (connection);
03007 
03008   if (retval)
03009     {
03010       /* Do the actual free outside the connection lock */
03011       if (old_free_func)
03012         (* old_free_func) (old_data);
03013     }
03014 
03015   return retval;
03016 }
03017 
03026 void*
03027 dbus_connection_get_data (DBusConnection   *connection,
03028                           dbus_int32_t      slot)
03029 {
03030   void *res;
03031 
03032   _dbus_return_val_if_fail (connection != NULL, NULL);
03033   
03034   CONNECTION_LOCK (connection);
03035 
03036   res = _dbus_data_slot_list_get (&slot_allocator,
03037                                   &connection->slot_list,
03038                                   slot);
03039   
03040   CONNECTION_UNLOCK (connection);
03041 
03042   return res;
03043 }
03044 
03051 void
03052 dbus_connection_set_change_sigpipe (dbus_bool_t will_modify_sigpipe)
03053 {  
03054   _dbus_modify_sigpipe = will_modify_sigpipe != FALSE;
03055 }
03056 
03065 void
03066 dbus_connection_set_max_message_size (DBusConnection *connection,
03067                                       long            size)
03068 {
03069   _dbus_return_if_fail (connection != NULL);
03070   
03071   CONNECTION_LOCK (connection);
03072   _dbus_transport_set_max_message_size (connection->transport,
03073                                         size);
03074   CONNECTION_UNLOCK (connection);
03075 }
03076 
03083 long
03084 dbus_connection_get_max_message_size (DBusConnection *connection)
03085 {
03086   long res;
03087 
03088   _dbus_return_val_if_fail (connection != NULL, 0);
03089   
03090   CONNECTION_LOCK (connection);
03091   res = _dbus_transport_get_max_message_size (connection->transport);
03092   CONNECTION_UNLOCK (connection);
03093   return res;
03094 }
03095 
03121 void
03122 dbus_connection_set_max_received_size (DBusConnection *connection,
03123                                        long            size)
03124 {
03125   _dbus_return_if_fail (connection != NULL);
03126   
03127   CONNECTION_LOCK (connection);
03128   _dbus_transport_set_max_received_size (connection->transport,
03129                                          size);
03130   CONNECTION_UNLOCK (connection);
03131 }
03132 
03139 long
03140 dbus_connection_get_max_received_size (DBusConnection *connection)
03141 {
03142   long res;
03143 
03144   _dbus_return_val_if_fail (connection != NULL, 0);
03145   
03146   CONNECTION_LOCK (connection);
03147   res = _dbus_transport_get_max_received_size (connection->transport);
03148   CONNECTION_UNLOCK (connection);
03149   return res;
03150 }
03151 
03162 long
03163 dbus_connection_get_outgoing_size (DBusConnection *connection)
03164 {
03165   long res;
03166 
03167   _dbus_return_val_if_fail (connection != NULL, 0);
03168   
03169   CONNECTION_LOCK (connection);
03170   res = _dbus_counter_get_value (connection->outgoing_counter);
03171   CONNECTION_UNLOCK (connection);
03172   return res;
03173 }
03174 

Generated on Wed Oct 22 14:05:01 2003 for D-BUS by doxygen1.3-rc3