<DIV> <DIV> Hello.  I have some quesion about dbus.Can you help me? Please. 1.     Does dbus have to use cache in file system? where is it ?Does it use default user's home directory for cache? Does it have to be writable in the home directory. I embedded dbus in arm linux, where there is no user( only root) and no root directory and files is read only. 2.     How is dbus secure policy? Does it have to use users file such as /etc/group and  /etc/passwd to work safely? Which files have something to do with dbus at least if yes? Now I get stuck  on a dbus failure when I ran hcid .Please help me. I have compliled dbus with verbose enabled.When I ran daemon,the following message apparred [root@(none) /]# DBUS_VERBOSE=1 dbus-daemon --system 433: Allocated slot 0 on allocator 0x5cd58 total 1 slots allocated 1 used 433: No cache for UID 0 433: Using cache for UID 0 information 433: listening on unix socket /var/run/dbus/system_bus_socket abstract=0 433: Read 12 bytes from /dev/urandom 433:Initialized server on address unix:path=/var/run/dbus/system_bus_socket,guid=692b534d9b592b6ede4e0d0000000152 433: Adding a read watch on fd 3 using newly-set add watch function 433: Allocated slot 0 on allocator 0x5ccfc total 1 slots allocated 1 used 433: No cache for user "messagebus" 433: Becoming a daemon... 433: chdir to / 433: forking... 434: in child, closing std file descriptors 433: parent writing pid file 433: parent exiting When I ran dbus-monitor,it failed. [root@(none) /]# dbus-monitor --system 436: Filling in system bus address... 436:   used default system bus "unix:path=/var/run/dbus/system_bus_socket" 436: Filling in session bus address... 436:   "autolaunch:" 436: Filling in activation bus address... 436:   "none set" 436: opening shared connection to: unix:path=/var/run/dbus/system_bus_socket 436: checking for existing connection 436: creating shared_connections hash table 436:   successfully created shared_connections 436: connecting to unix socket /var/run/dbus/system_bus_socket abstract=0 436: Successfully connected to unix socket /var/run/dbus/system_bus_socket 436: client: going from state NeedSendAuth to state WaitingForData 436: Initialized transport on address unix:path=/var/run/dbus/system_bus_socket 436:   LOCK: _dbus_connection_new_for_transport 436:   UNLOCK: protected_change_watch 436:   LOCK: protected_change_watch 436:   UNLOCK: protected_change_watch 436:   LOCK: protected_change_watch 436: check_read_watch: fd = 3 436:   setting read watch enabled = 0 436:   UNLOCK: protected_change_watch 436:   LOCK: protected_change_watch 436: check_write_watch(): needed = 1 on connection 0x136e8 watch 0x13388 fd = 3 outgoing messages exist 0 436:   UNLOCK: protected_change_watch 436:   LOCK: protected_change_watch 436:   UNLOCK: _dbus_connection_new_for_transport 436:   LOCK: _dbus_connection_open_internal 436:   UNLOCK: _dbus_connection_open_internal 436:   LOCK: dbus_connection_set_exit_on_disconnect 436:   UNLOCK: dbus_connection_set_exit_on_disconnect 436: Allocated slot 0 on allocator 0x4005a450 total 1 slots allocated 1 used 436:   LOCK: dbus_connection_get_data 436:   UNLOCK: dbus_connection_get_data 436:   LOCK: dbus_connection_set_data 436:   UNLOCK: dbus_connection_set_data 436:   LOCK: dbus_connection_send_with_reply 436: Allocated slot 0 on allocator 0x4005a498 total 1 slots allocated 1 used 436:   UNLOCK: protected_change_timeout 436:   LOCK: protected_change_timeout 436: Message 0x13918 (1 /org/freedesktop/DBus org.freedesktop.DBus Hello '') for org.freedesktop.DBus added to outgoing queue 0x136e8, 1 pending to send 436: Message 0x13918 serial is 1 436: _dbus_connection_do_iteration_unlocked start 436:   UNLOCK: _dbus_connection_acquire_io_path 436: _dbus_connection_acquire_io_path locking io_path_mutex 436: _dbus_connection_acquire_io_path start connection->io_path_acquired = 0 timeout = 0 436: _dbus_connection_acquire_io_path end connection->io_path_acquired = 1 we_acquired = 1 436: _dbus_connection_acquire_io_path unlocking io_path_mutex 436:   LOCK: _dbus_connection_acquire_io_path 436: Transport iteration flags 0x1 timeout -1 connected = 1 436:  iteration flags = write timeout = -1 read_watch = 0x133b0 write_watch = 0x13388 fd = 3 436: in iteration, need_read=0 need_write=1 436: exchange_credentials: do_reading = 0, do_writing = 1 436: wrote credentials byte 436:  client auth state: bytes to send 436: client: Sent 18 bytes of: AUTH EXTERNAL 30 436: exchange_credentials: do_reading = 0, do_writing = 1 436:  client auth state: waiting for input 436: check_read_watch: fd = 3 436:   setting read watch enabled = 1 436:   UNLOCK: protected_change_watch 436:   LOCK: protected_change_watch 436: check_write_watch(): needed = 0 on connection 0x136e8 watch 0x13388 fd = 3 outgoing messages exist 1 436:   UNLOCK: protected_change_watch 436:   LOCK: protected_change_watch 436: Not authenticated, not writing anything 436: check_write_watch(): needed = 0 on connection 0x136e8 watch 0x13388 fd = 3 outgoing messages exist 1 436:   UNLOCK: protected_change_watch 436:   LOCK: protected_change_watch 436:  ... leaving do_iteration() 436: _dbus_transport_do_iteration end 436: _dbus_connection_release_io_path locking io_path_mutex 436: _dbus_connection_release_io_path start connection->io_path_acquired = 1 436: _dbus_connection_release_io_path unlocking io_path_mutex 436: _dbus_connection_do_iteration_unlocked end 436: dispatch status = complete is_connected = 1 436:   UNLOCK: _dbus_connection_update_dispatch_status_and_unlock 436:   LOCK: dbus_connection_unref 436:   UNLOCK: dbus_connection_unref 436:   LOCK: _dbus_connection_lock 436:   UNLOCK: _dbus_connection_unlock 436:   LOCK: _dbus_connection_lock 436:   UNLOCK: _dbus_connection_unlock 436:   LOCK: _dbus_connection_lock 436: doing iteration in _dbus_connection_flush_unlocked 436: _dbus_connection_do_iteration_unlocked start 436:   UNLOCK: _dbus_connection_acquire_io_path 436: _dbus_connection_acquire_io_path locking io_path_mutex 436: _dbus_connection_acquire_io_path start connection->io_path_acquired = 0 timeout = -1 436: _dbus_connection_acquire_io_path end connection->io_path_acquired = 1 we_acquired = 1 436: _dbus_connection_acquire_io_path unlocking io_path_mutex 436:   LOCK: _dbus_connection_acquire_io_path 436: Transport iteration flags 0x7 timeout -1 connected = 1 436:  iteration flags = readwrite timeout = -1 read_watch = 0x133b0 write_watch = 0x13388 fd = 3 436: unlock socket_do_iteration pre poll 436:   UNLOCK: _dbus_connection_unlock 436: lock socket_do_iteration post poll 436:   LOCK: _dbus_connection_lock 436: in iteration, need_read=1 need_write=0 436: exchange_credentials: do_reading = 1, do_writing = 0 436:  client auth state: waiting for input 436:  read 37 bytes in auth phase 436: client: got command "OK 692b534d9b592b6ede4e0d0000000152" 436: Got GUID '692b534d9b592b6ede4e0d0000000152' from the server 436: client: going from state WaitingForData to state Authenticated 436: exchange_credentials: do_reading = 1, do_writing = 0 436:  client auth state: bytes to send 436: check_read_watch: fd = 3 436:   setting read watch enabled = 0 436:   UNLOCK: protected_change_watch 436:   LOCK: protected_change_watch 436: check_write_watch(): needed = 1 on connection 0x136e8 watch 0x13388 fd = 3 outgoing messages exist 1 436:   UNLOCK: protected_change_watch 436:   LOCK: protected_change_watch 436: do_reading: fd = 3 436: check_write_watch(): needed = 1 on connection 0x136e8 watch 0x13388 fd = 3 outgoing messages exist 1 436:   UNLOCK: protected_change_watch 436:   LOCK: protected_change_watch 436:  ... leaving do_iteration() 436: _dbus_transport_do_iteration end 436: _dbus_connection_release_io_path locking io_path_mutex 436: _dbus_connection_release_io_path start connection->io_path_acquired = 1 436: _dbus_connection_release_io_path unlocking io_path_mutex 436: _dbus_connection_do_iteration_unlocked end 436: doing iteration in _dbus_connection_flush_unlocked 436: _dbus_connection_do_iteration_unlocked start 436:   UNLOCK: _dbus_connection_acquire_io_path 436: _dbus_connection_acquire_io_path locking io_path_mutex 436: _dbus_connection_acquire_io_path start connection->io_path_acquired = 0 timeout = -1 436: _dbus_connection_acquire_io_path end connection->io_path_acquired = 1 we_acquired = 1 436: _dbus_connection_acquire_io_path unlocking io_path_mutex 436:   LOCK: _dbus_connection_acquire_io_path 436: Transport iteration flags 0x7 timeout -1 connected = 1 436:  iteration flags = readwrite timeout = -1 read_watch = 0x133b0 write_watch = 0x13388 fd = 3 436: unlock socket_do_iteration pre poll 436:   UNLOCK: _dbus_connection_unlock 436: lock socket_do_iteration post poll 436:   LOCK: _dbus_connection_lock 436: in iteration, need_read=0 need_write=1 436: exchange_credentials: do_reading = 0, do_writing = 1 436:  client auth state: bytes to send 436: client: Sent 7 bytes of: BEGIN 436: check_read_watch: fd = 3 436:   setting read watch enabled = 1 436:   UNLOCK: protected_change_watch 436:   LOCK: protected_change_watch 436: check_write_watch(): needed = 1 on connection 0x136e8 watch 0x13388 fd = 3 outgoing messages exist 1 436:   UNLOCK: protected_change_watch 436:   LOCK: protected_change_watch 436: check_write_watch(): needed = 1 on connection 0x136e8 watch 0x13388 fd = 3 outgoing messages exist 1 436:   UNLOCK: protected_change_watch 436:   LOCK: protected_change_watch 436:  ... leaving do_iteration() 436: _dbus_transport_do_iteration end 436: _dbus_connection_release_io_path locking io_path_mutex 436: _dbus_connection_release_io_path start connection->io_path_acquired = 1 436: _dbus_connection_release_io_path unlocking io_path_mutex 436: _dbus_connection_do_iteration_unlocked end 436: doing iteration in _dbus_connection_flush_unlocked 436: _dbus_connection_do_iteration_unlocked start 436:   UNLOCK: _dbus_connection_acquire_io_path 436: _dbus_connection_acquire_io_path locking io_path_mutex 436: _dbus_connection_acquire_io_path start connection->io_path_acquired = 0 timeout = -1 436: _dbus_connection_acquire_io_path end connection->io_path_acquired = 1 we_acquired = 1 436: _dbus_connection_acquire_io_path unlocking io_path_mutex 436:   LOCK: _dbus_connection_acquire_io_path 436: Transport iteration flags 0x7 timeout -1 connected = 1 436:  iteration flags = readwrite timeout = -1 read_watch = 0x133b0 write_watch = 0x13388 fd = 3 436: unlock socket_do_iteration pre poll 436:   UNLOCK: _dbus_connection_unlock 436: lock socket_do_iteration post poll 436:   LOCK: _dbus_connection_lock 436: in iteration, need_read=0 need_write=1 436: do_writing(), have_messages = 1, fd = 3 436:  wrote 128 bytes of 128 436: Message 0x13918 (1 /org/freedesktop/DBus org.freedesktop.DBus Hello '') removed from outgoing queue 0x136e8, 0 left to send 436: check_write_watch(): needed = 0 on connection 0x136e8 watch 0x13388 fd = 3 outgoing messages exist 0 436:   UNLOCK: protected_change_watch 436:   LOCK: protected_change_watch 436:  ... leaving do_iteration() 436: _dbus_transport_do_iteration end 436: _dbus_connection_release_io_path locking io_path_mutex 436: _dbus_connection_release_io_path start connection->io_path_acquired = 1 436: _dbus_connection_release_io_path unlocking io_path_mutex 436: _dbus_connection_do_iteration_unlocked end 436: _dbus_connection_flush_unlocked middle 436:  0 unused bytes sent to message loader 436: dispatch status = complete is_connected = 1 436: dbus_connection_send_with_reply_and_block(): will block 25000 milliseconds for reply serial 1 from 377 sec 251411 usec to 402 sec 251411 usec 436: _dbus_connection_do_iteration_unlocked start 436:   UNLOCK: _dbus_connection_acquire_io_path 436: _dbus_connection_acquire_io_path locking io_path_mutex 436: _dbus_connection_acquire_io_path start connection->io_path_acquired = 0 timeout = 25000 436: _dbus_connection_acquire_io_path end connection->io_path_acquired = 1 we_acquired = 1 436: _dbus_connection_acquire_io_path unlocking io_path_mutex 436:   LOCK: _dbus_connection_acquire_io_path 436: Transport iteration flags 0x6 timeout 25000 connected = 1 436:  iteration flags = read timeout = 25000 read_watch = 0x133b0 write_watch = 0x13388 fd = 3 436: unlock socket_do_iteration pre poll 436:   UNLOCK: _dbus_connection_unlock 436: lock socket_do_iteration post poll 436:   LOCK: _dbus_connection_lock 436: in iteration, need_read=1 need_write=0 436: do_reading: fd = 3 436: check_read_watch: fd = 3 436:   setting read watch enabled = 1 436:   UNLOCK: protected_change_watch 436:   LOCK: protected_change_watch 436: Disconnected from remote app 436: _dbus_transport_disconnect start 436: socket_disconnect 436: free_watches start 436:   UNLOCK: protected_change_watch 436:   LOCK: protected_change_watch 436: Setting watch fd -1 data to data = (nil) function = (nil) from data = (nil) function = (nil) 436:   UNLOCK: protected_change_watch 436:   LOCK: protected_change_watch 436: Setting watch fd -1 data to data = (nil) function = (nil) from data = (nil) function = (nil) 436: free_watches end 436: _dbus_transport_disconnect end 436:  ... leaving do_iteration() 436: _dbus_transport_do_iteration end 436: _dbus_connection_release_io_path locking io_path_mutex 436: _dbus_connection_release_io_path start connection->io_path_acquired = 1 436: _dbus_connection_release_io_path unlocking io_path_mutex 436: _dbus_connection_do_iteration_unlocked end 436: _dbus_connection_block_pending_call top of recheck 436: dispatch status = complete is_connected = 0 436: Sending disconnect message from notify_disconnected_and_dispatch_complete_unlocked 436: Synthesized message 0x13a78 added to incoming queue 0x136e8, 1 incoming 436:   UNLOCK: protected_change_timeout 436:   LOCK: protected_change_timeout 436:   UNLOCK: _dbus_connection_unlock 436:   LOCK: free_pending_call_on_hash_removal 436:   UNLOCK: _dbus_connection_unlock 436:   LOCK: connection_timeout_and_complete_all_pending_calls_unlocked 436: Synthesized message 0x13770 added to incoming queue 0x136e8, 2 incoming 436: check_for_reply_and_update_dispatch_unlocked checked for reply 436: dbus_connection_send_with_reply_and_block(): got reply 436:   handing message 0x13a78 (error) to pending call serial 1 436:   UNLOCK: _dbus_connection_unlock 436:   LOCK: _dbus_connection_lock 436:   UNLOCK: _dbus_connection_unlock 436:   LOCK: check_for_reply_and_update_dispatch_unlocked 436:   UNLOCK: _dbus_connection_update_dispatch_status_and_unlock 436:   LOCK: dbus_connection_unref 436:   UNLOCK: dbus_connection_unref 436:   LOCK: _dbus_connection_lock 436:   UNLOCK: _dbus_connection_unlock 436:   LOCK: _dbus_connection_lock 436:   UNLOCK: _dbus_connection_unlock 436:   LOCK: _dbus_connection_lock 436:   UNLOCK: _dbus_connection_unlock 436: Freeing slot 0 on allocator 0x4005a498 total 1 allocated 1 used 436:   LOCK: dbus_connection_unref 436:   UNLOCK: dbus_connection_unref 436:   LOCK: _dbus_connection_close_possibly_shared 436: Disconnecting 0x136e8 436: _dbus_transport_disconnect start 436:   UNLOCK: _dbus_connection_update_dispatch_status_and_unlock 436:   LOCK: dbus_connection_unref 436:   UNLOCK: dbus_connection_unref 436:   LOCK: dbus_connection_unref 436:   UNLOCK: dbus_connection_unref 436:   LOCK: dbus_connection_unref 436:   UNLOCK: dbus_connection_unref Failed to open connection to system message bus: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.                                                                                                          Wang Jimscen                                                            Jun 15,2007</DIV> <DIV> </DIV></DIV> <DIV> </DIV> <DIV> </DIV> <DIV> </DIV>  <hr> <a style="font-size:14px;line-height:15px; color:#000; text-decoration:none" href="http://event.mail.163.com/chanel/xyq.htm?from=163_NO1" target="_blank">150 حٍ بث ح¬ ت± شع حو µؤ حّ سخ£¬ؤم ²» تش تش آً £؟ </a>