C++ dbus_error_is_set函数代码示例

	int
conf_drp_show_domain_ip(DBusConnection *connection,
		domain_cst *domain_configs_ret)
{
	DBusMessage *query, *reply;
	DBusError err;
	DBusMessageIter  iter;
	DBusMessageIter  iter_array;
	int iRet=0;
	int i = 0, ip_num = 0;
	char *domain_name = NULL;
	int index = 0;
	unsigned long ipaddr = 0;

	query = dbus_message_new_method_call(
			DRP_DBUS_BUSNAME,
			DRP_DBUS_OBJPATH,
			DRP_DBUS_INTERFACE, 
			DRP_DBUS_METHOD_SHOW_DOMAIN_IP );
	dbus_error_init(&err);
	dbus_message_append_args( query,
					DBUS_TYPE_INVALID );

	reply = dbus_connection_send_with_reply_and_block (
			connection, query, -1, &err );

	dbus_message_unref(query);
	if ( NULL == reply ){	
		if (dbus_error_is_set(&err)){
			dbus_error_free(&err);
		}
		return DRP_ERR_DBUS_FAILED;
	}else{
		dbus_message_iter_init(reply,&iter);
		//dbus_message_iter_next(&iter);
		dbus_message_iter_get_basic(&iter, &iRet);
		if( DRP_RETURN_OK == iRet ){
			memset (domain_configs_ret, 0, sizeof(domain_configs_ret));
			dbus_message_iter_next(&iter);
			dbus_message_iter_get_basic(&iter, &ip_num);
			if( ip_num > MAX_DOMAIN_CONFIG_NUM*MAX_DOMAIN_IPADDR ){
				ip_num = MAX_DOMAIN_CONFIG_NUM*MAX_DOMAIN_IPADDR;
			}
			domain_configs_ret->num = ip_num;
			if( ip_num > 0 ){
				dbus_message_iter_next(&iter);	
				dbus_message_iter_recurse(&iter,&iter_array);			
				for( i=0; i<ip_num; i++ ){
					DBusMessageIter iter_struct;
					dbus_message_iter_recurse(&iter_array,&iter_struct);
					dbus_message_iter_get_basic(&iter_struct, &domain_name);
					strncpy((domain_configs_ret->domain[i].domain_name), domain_name,\
							sizeof(domain_configs_ret->domain[i].domain_name));
					dbus_message_iter_next(&iter_struct);
					dbus_message_iter_get_basic(&iter_struct,	\
							&(index));
					domain_configs_ret->domain[i].index = index;
					dbus_message_iter_next(&iter_struct);
					dbus_message_iter_get_basic(&iter_struct, \
							&(ipaddr));
					domain_configs_ret->domain[i].ipaddr = ipaddr;
					dbus_message_iter_next(&iter_array);
#ifdef drp_test_interface	
					printf("domain %s ip index %d ipaddr %lu\n",\
							(domain_configs_ret->domain[i].domain_name),\
							(domain_configs_ret->domain[i].index),\
							(domain_configs_ret->domain[i].ipaddr));
#endif
				}
			}
		}
	}

	dbus_message_unref(reply);

	return iRet;
}

int main(int argc, char *argv[])
{
	GOptionContext *context;
	GError *error = NULL;
	DBusConnection *conn;
	DBusError err;
	guint signal;

#ifdef NEED_THREADS
	if (g_thread_supported() == FALSE)
		g_thread_init(NULL);
#endif

	context = g_option_context_new(NULL);
	g_option_context_add_main_entries(context, options, NULL);

	if (g_option_context_parse(context, &argc, &argv, &error) == FALSE) {
		if (error != NULL) {
			g_printerr("%s\n", error->message);
			g_error_free(error);
		} else
			g_printerr("An unknown error occurred\n");
		exit(1);
	}

	g_option_context_free(context);

	if (option_version == TRUE) {
		printf("%s\n", VERSION);
		exit(0);
	}

	if (option_detach == TRUE) {
		if (daemon(0, 0)) {
			perror("Can't start daemon");
			exit(1);
		}
	}

	if (mkdir(STATEDIR, S_IRUSR | S_IWUSR | S_IXUSR |
				S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) < 0) {
		if (errno != EEXIST)
			perror("Failed to create state directory");
	}

	if (mkdir(STORAGEDIR, S_IRUSR | S_IWUSR | S_IXUSR |
				S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) < 0) {
		if (errno != EEXIST)
			perror("Failed to create storage directory");
	}

	umask(0077);

	main_loop = g_main_loop_new(NULL, FALSE);

#ifdef NEED_THREADS
	if (dbus_threads_init_default() == FALSE) {
		fprintf(stderr, "Can't init usage of threads\n");
		exit(1);
	}
#endif

	signal = setup_signalfd();

	dbus_error_init(&err);

	conn = g_dbus_setup_bus(DBUS_BUS_SYSTEM, CONNMAN_SERVICE, &err);
	if (conn == NULL) {
		if (dbus_error_is_set(&err) == TRUE) {
			fprintf(stderr, "%s\n", err.message);
			dbus_error_free(&err);
		} else
			fprintf(stderr, "Can't register with system bus\n");
		exit(1);
	}

	g_dbus_set_disconnect_function(conn, disconnect_callback, NULL, NULL);

	__connman_log_init(argv[0], option_debug, option_detach,
			option_backtrace, "Connection Manager", VERSION);

	__connman_dbus_init(conn);

	if (option_config == NULL)
		config_init(CONFIGMAINFILE);
	else
		config_init(option_config);

	__connman_inotify_init();
	__connman_technology_init();
	__connman_notifier_init();
	__connman_agent_init();
	__connman_service_init();
	__connman_provider_init();
	__connman_network_init();
	__connman_device_init(option_device, option_nodevice);

	__connman_ippool_init();
	__connman_iptables_init();
	__connman_firewall_init();
//.........这里部分代码省略.........

//.........这里部分代码省略.........
    _dbus_assert_not_reached ("received a NULL message");

  if (dbus_message_get_reply_serial (message) != 5678)
    _dbus_assert_not_reached ("reply serial fields differ");

  dbus_message_unref (message);

  /* ovveride the serial, since it was reset by dbus_message_copy() */
  dbus_message_set_serial(message_without_unix_fds, 8901);

  dbus_message_lock (message_without_unix_fds);

  verify_test_message (message_without_unix_fds);

    {
      /* Marshal and demarshal the message. */

      DBusMessage *message2;
      DBusError error = DBUS_ERROR_INIT;
      char *marshalled = NULL;
      int len = 0;
      char garbage_header[DBUS_MINIMUM_HEADER_SIZE] = "xxx";

      if (!dbus_message_marshal (message_without_unix_fds, &marshalled, &len))
        _dbus_assert_not_reached ("failed to marshal message");

      _dbus_assert (len != 0);
      _dbus_assert (marshalled != NULL);

      _dbus_assert (dbus_message_demarshal_bytes_needed (marshalled, len) == len);
      message2 = dbus_message_demarshal (marshalled, len, &error);

      _dbus_assert (message2 != NULL);
      _dbus_assert (!dbus_error_is_set (&error));
      verify_test_message (message2);

      dbus_message_unref (message2);
      dbus_free (marshalled);

      /* Demarshal invalid message. */

      message2 = dbus_message_demarshal ("invalid", 7, &error);
      _dbus_assert (message2 == NULL);
      _dbus_assert (dbus_error_is_set (&error));
      dbus_error_free (&error);

      /* Demarshal invalid (empty) message. */

      message2 = dbus_message_demarshal ("", 0, &error);
      _dbus_assert (message2 == NULL);
      _dbus_assert (dbus_error_is_set (&error));
      dbus_error_free (&error);

      /* Bytes needed to demarshal empty message: 0 (more) */

      _dbus_assert (dbus_message_demarshal_bytes_needed ("", 0) == 0);
      
      /* Bytes needed to demarshal invalid message: -1 (error). */

      _dbus_assert (dbus_message_demarshal_bytes_needed (garbage_header, DBUS_MINIMUM_HEADER_SIZE) == -1);
    }

  dbus_message_unref (message_without_unix_fds);
  _dbus_message_loader_unref (loader);

  check_memleaks ();

/**
 * Initialize D-Bus connection.
 */
bool
cdbus_init(session_t *ps) {
  DBusError err = { };

  // Initialize
  dbus_error_init(&err);

  // Connect to D-Bus
  // Use dbus_bus_get_private() so we can fully recycle it ourselves
  ps->dbus_conn = dbus_bus_get_private(DBUS_BUS_SESSION, &err);
  if (dbus_error_is_set(&err)) {
    printf_errf("(): D-Bus connection failed (%s).", err.message);
    dbus_error_free(&err);
    return false;
  }

  if (!ps->dbus_conn) {
    printf_errf("(): D-Bus connection failed for unknown reason.");
    return false;
  }

  // Avoid exiting on disconnect
  dbus_connection_set_exit_on_disconnect(ps->dbus_conn, false);

  // Request service name
  {
    // Build service name
    char *service = mstrjoin3(CDBUS_SERVICE_NAME, ".", ps->o.display_repr);
    ps->dbus_service = service;

    // Request for the name
    int ret = dbus_bus_request_name(ps->dbus_conn, service,
        DBUS_NAME_FLAG_DO_NOT_QUEUE, &err);

    if (dbus_error_is_set(&err)) {
      printf_errf("(): Failed to obtain D-Bus name (%s).", err.message);
      dbus_error_free(&err);
    }

    if (DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER != ret
        && DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER != ret) {
      printf_errf("(): Failed to become the primary owner of requested "
          "D-Bus name (%d).", ret);
    }
  }


  // Add watch handlers
  if (!dbus_connection_set_watch_functions(ps->dbus_conn,
        cdbus_callback_add_watch, cdbus_callback_remove_watch,
        cdbus_callback_watch_toggled, ps, NULL)) {
    printf_errf("(): Failed to add D-Bus watch functions.");
    return false;
  }

  // Add timeout handlers
  if (!dbus_connection_set_timeout_functions(ps->dbus_conn,
        cdbus_callback_add_timeout, cdbus_callback_remove_timeout,
        cdbus_callback_timeout_toggled, ps, NULL)) {
    printf_errf("(): Failed to add D-Bus timeout functions.");
    return false;
  }

  // Add match
  dbus_bus_add_match(ps->dbus_conn,
      "type='method_call',interface='" CDBUS_INTERFACE_NAME "'", &err);
  if (dbus_error_is_set(&err)) {
    printf_errf("(): Failed to add D-Bus match.");
    dbus_error_free(&err);
    return false;
  }

  return true;
}

static dbus_bool_t
match_name_owner_changed_signal (DBusConnection *conn, const char *bus_name, const char *lost_name, const char *acquired_name)
{
  int tries;
  DBusMessage *msg;
 
  for (tries = 0; tries < NUM_TRIES_TIL_FAIL; tries++)
    {
      _dbus_connection_lock (conn);
      _dbus_connection_do_iteration_unlocked (conn,
                                              DBUS_ITERATION_DO_READING |
                                              DBUS_ITERATION_DO_WRITING |
                                              DBUS_ITERATION_BLOCK,
                                              0);
      _dbus_connection_unlock (conn);
      msg = dbus_connection_pop_message (conn);
    
      if (msg != NULL)
        {
          if (dbus_message_is_signal (msg, 
              "org.freedesktop.DBus",
              "NameOwnerChanged"))
            {
              const char *n;
              const char *ln;
              const char *an;
              DBusError error;
              dbus_error_init (&error);

              dbus_message_get_args (msg, &error, DBUS_TYPE_STRING, &n, DBUS_TYPE_STRING, &ln, DBUS_TYPE_STRING, &an, DBUS_TYPE_INVALID);

              if (dbus_error_is_set (&error))
                {
                  fprintf (stderr, "Error getting args: %s\n", error.message);
                  dbus_error_free (&error);
                  dbus_message_unref (msg);
                  return FALSE;
                }

              if (strcmp (n, bus_name) == 0)
                {
                  if ((lost_name == NULL && strcmp (ln, "") == 0)
                        || strcmp (lost_name, ln) == 0)
                    {
                      if ((acquired_name == NULL && strcmp (an, "") == 0)
                            || strcmp (acquired_name, an) == 0)
                        {
                          dbus_message_unref (msg); 
                          break;
                        }
                      else
                        {
                          fprintf (stderr, "Error: name %s was expected to be acquired but we got %s instead\n", acquired_name, an);
                          dbus_message_unref (msg);
                          return FALSE;
                        }
                    }
                  else
                    {
                      fprintf (stderr, "Error: name %s was expected to be lost but we got %s instead\n", lost_name, ln);
                      dbus_message_unref (msg);
                      return FALSE;
                    }
                }
            }
          dbus_message_unref (msg);
        }
    }

  if (tries == NUM_TRIES_TIL_FAIL)
    {
      fprintf (stderr, "Did not recive the expected NameOwnerChanged signal!!!\n");
      return FALSE;
    }
  
  return TRUE;
}

/**
 * Try to open a new transport for the given address entry.  (This
 * opens a client-side-of-the-connection transport.)
 * 
 * @param entry the address entry
 * @param error location to store reason for failure.
 * @returns new transport of #NULL on failure.
 */
DBusTransport*
_dbus_transport_open (DBusAddressEntry *entry,
                      DBusError        *error)
{
  DBusTransport *transport;
  const char *expected_guid_orig;
  char *expected_guid;
  int i;
  DBusError tmp_error = DBUS_ERROR_INIT;

  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
  
  transport = NULL;
  expected_guid_orig = dbus_address_entry_get_value (entry, "guid");
  expected_guid = _dbus_strdup (expected_guid_orig);

  if (expected_guid_orig != NULL && expected_guid == NULL)
    {
      _DBUS_SET_OOM (error);
      return NULL;
    }

  for (i = 0; i < (int) _DBUS_N_ELEMENTS (open_funcs); ++i)
    {
      DBusTransportOpenResult result;

      _DBUS_ASSERT_ERROR_IS_CLEAR (&tmp_error);
      result = (* open_funcs[i].func) (entry, &transport, &tmp_error);

      switch (result)
        {
        case DBUS_TRANSPORT_OPEN_OK:
          _DBUS_ASSERT_ERROR_IS_CLEAR (&tmp_error);
          goto out;
          break;
        case DBUS_TRANSPORT_OPEN_NOT_HANDLED:
          _DBUS_ASSERT_ERROR_IS_CLEAR (&tmp_error);
          /* keep going through the loop of open funcs */
          break;
        case DBUS_TRANSPORT_OPEN_BAD_ADDRESS:
          _DBUS_ASSERT_ERROR_IS_SET (&tmp_error);
          goto out;
          break;
        case DBUS_TRANSPORT_OPEN_DID_NOT_CONNECT:
          _DBUS_ASSERT_ERROR_IS_SET (&tmp_error);
          goto out;
          break;
        }
    }

 out:
  
  if (transport == NULL)
    {
      if (!dbus_error_is_set (&tmp_error))
        _dbus_set_bad_address (&tmp_error,
                               NULL, NULL,
                               "Unknown address type (examples of valid types are \"tcp\" and on UNIX \"unix\")");
      
      _DBUS_ASSERT_ERROR_IS_SET (&tmp_error);
      dbus_move_error(&tmp_error, error);
      dbus_free (expected_guid);
    }
  else
    {
      _DBUS_ASSERT_ERROR_IS_CLEAR (&tmp_error);

      /* In the case of autostart the initial guid is NULL
       * and the autostart transport recursively calls
       * _dbus_open_transport wich returns a transport
       * with a guid.  That guid is the definitive one.
       *
       * FIXME: if more transports are added they may have
       * an effect on the expected_guid semantics (i.e. 
       * expected_guid and transport->expected_guid may
       * both have values).  This is very unlikely though
       * we should either throw asserts here for those 
       * corner cases or refactor the code so it is 
       * clearer on what is expected and what is not
       */
      if(expected_guid)
        transport->expected_guid = expected_guid;
    }

  return transport;
}

int main(int argc, char *argv[])
{
	GOptionContext *context;
	GError *error = NULL;
	DBusConnection *conn;
	DBusError err;
	guint signal;

	context = g_option_context_new(NULL);
	g_option_context_add_main_entries(context, options, NULL);

	if (!g_option_context_parse(context, &argc, &argv, &error)) {
		if (error) {
			g_printerr("%s\n", error->message);
			g_error_free(error);
		} else
			g_printerr("An unknown error occurred\n");
		exit(1);
	}

	g_option_context_free(context);

	if (option_version) {
		printf("%s\n", VERSION);
		exit(0);
	}

	if (option_detach) {
		if (daemon(0, 0)) {
			perror("Can't start daemon");
			exit(1);
		}
	}

	if (mkdir(STATEDIR, S_IRUSR | S_IWUSR | S_IXUSR |
				S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) < 0) {
		if (errno != EEXIST)
			perror("Failed to create state directory");
	}

	/*
	 * At some point the VPN stuff is migrated into VPN_STORAGEDIR
	 * and this mkdir() call can be removed.
	 */
	if (mkdir(STORAGEDIR, S_IRUSR | S_IWUSR | S_IXUSR |
				S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) < 0) {
		if (errno != EEXIST)
			perror("Failed to create storage directory");
	}

	if (mkdir(VPN_STORAGEDIR, S_IRUSR | S_IWUSR | S_IXUSR |
				S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) < 0) {
		if (errno != EEXIST)
			perror("Failed to create VPN storage directory");
	}

	umask(0077);

	main_loop = g_main_loop_new(NULL, FALSE);

	signal = setup_signalfd();

	dbus_error_init(&err);

	conn = g_dbus_setup_bus(DBUS_BUS_SYSTEM, VPN_SERVICE, &err);
	if (!conn) {
		if (dbus_error_is_set(&err)) {
			fprintf(stderr, "%s\n", err.message);
			dbus_error_free(&err);
		} else
			fprintf(stderr, "Can't register with system bus\n");
		exit(1);
	}

	g_dbus_set_disconnect_function(conn, disconnect_callback, NULL, NULL);

	__connman_log_init(argv[0], option_debug, option_detach, false,
			"Connection Manager VPN daemon", VERSION);
	__connman_dbus_init(conn);

	if (!option_config)
		config_init(CONFIGMAINFILE);
	else
		config_init(option_config);

	__connman_inotify_init();
	__connman_agent_init();
	__vpn_provider_init(option_routes);
	__vpn_manager_init();
	__vpn_ipconfig_init();
	__vpn_rtnl_init();
	__connman_task_init();
	__connman_plugin_init(option_plugin, option_noplugin);
	__vpn_config_init();

	__vpn_rtnl_start();

	g_free(option_plugin);
	g_free(option_noplugin);

//.........这里部分代码省略.........

    virtual int showNotify(const char *pcHeader, const char *pcBody)
    {
        int rc;
# ifdef VBOX_WITH_DBUS
        DBusConnection *conn;
        DBusMessage* msg = NULL;
        conn = dbus_bus_get (DBUS_BUS_SESSON, NULL);
        if (conn == NULL)
        {
            LogRelFlowFunc(("Could not retrieve D-BUS session bus!\n"));
            rc = VERR_INVALID_HANDLE;
        }
        else
        {
            msg = dbus_message_new_method_call("org.freedesktop.Notifications",
                                               "/org/freedesktop/Notifications",
                                               "org.freedesktop.Notifications",
                                               "Notify");
            if (msg == NULL)
            {
                LogRel(("Could not create D-BUS message!\n"));
                rc = VERR_INVALID_HANDLE;
            }
            else
                rc = VINF_SUCCESS;
        }
        if (RT_SUCCESS(rc))
        {
            uint32_t msg_replace_id = 0;
            const char *msg_app = "VBoxClient";
            const char *msg_icon = "";
            const char *msg_summary = pcHeader;
            const char *msg_body = pcBody;
            int32_t msg_timeout = -1;           /* Let the notification server decide */

            DBusMessageIter iter;
            DBusMessageIter array;
            DBusMessageIter dict;
            DBusMessageIter value;
            DBusMessageIter variant;
            DBusMessageIter data;

            /* Format: UINT32 org.freedesktop.Notifications.Notify
             *         (STRING app_name, UINT32 replaces_id, STRING app_icon, STRING summary, STRING body,
             *          ARRAY actions, DICT hints, INT32 expire_timeout)
             */
            dbus_message_iter_init_append(msg,&iter);
            dbus_message_iter_append_basic(&iter,DBUS_TYPE_STRING,&msg_app);
            dbus_message_iter_append_basic(&iter,DBUS_TYPE_UINT32,&msg_replace_id);
            dbus_message_iter_append_basic(&iter,DBUS_TYPE_STRING,&msg_icon);
            dbus_message_iter_append_basic(&iter,DBUS_TYPE_STRING,&msg_summary);
            dbus_message_iter_append_basic(&iter,DBUS_TYPE_STRING,&msg_body);
            dbus_message_iter_open_container(&iter,DBUS_TYPE_ARRAY,DBUS_TYPE_STRING_AS_STRING,&array);
            dbus_message_iter_close_container(&iter,&array);
            dbus_message_iter_open_container(&iter,DBUS_TYPE_ARRAY,"{sv}",&array);
            dbus_message_iter_close_container(&iter,&array);
            dbus_message_iter_append_basic(&iter,DBUS_TYPE_INT32,&msg_timeout);

            DBusError err;
            dbus_error_init(&err);

            DBusMessage *reply;
            reply = dbus_connection_send_with_reply_and_block(conn, msg,
                30 * 1000 /* 30 seconds timeout */, &err);
            if (dbus_error_is_set(&err))
            {
                LogRel(("D-BUS returned an error while sending the notification: %s", err.message));
            }
            else if (reply)
            {
                dbus_connection_flush(conn);
                dbus_message_unref(reply);
            }
            if (dbus_error_is_set(&err))
                dbus_error_free(&err);
        }
        if (msg != NULL)
            dbus_message_unref(msg);
# else
        /* TODO: Implement me */
        rc = VINF_SUCCESS;
# endif /* VBOX_WITH_DBUS */
        return rc;
    }

static DBusGProxy *dbus_connect (MoonshotError **error)
{
    DBusConnection  *dbconnection;
    DBusError        dbus_error;
    DBusGConnection *connection;
    DBusGProxy      *g_proxy;
    GError          *g_error = NULL;
    dbus_bool_t      name_has_owner;

    g_return_val_if_fail (*error == NULL, NULL);

    dbus_error_init (&dbus_error);

    /* Check for moonshot server and start the service if possible. We use
     * libdbus here because dbus-glib doesn't handle autostarting the service.
     * If/when we move to GDBus this code can become a one-liner.
     */

    if (is_setid()) {
        *error = moonshot_error_new (MOONSHOT_ERROR_IPC_ERROR,
	                             "Cannot use IPC while setid");
        return NULL;
    }
#ifdef IPC_DBUS_GLIB
    if (getenv("DISPLAY")==NULL) {
        connection = dbus_launch_moonshot();
        if (connection == NULL) {
            *error = moonshot_error_new (MOONSHOT_ERROR_IPC_ERROR,
                                         "Headless dbus launch failed");
            return NULL;
        }
    } else
#endif
    {
        connection = dbus_g_bus_get (DBUS_BUS_SESSION, &g_error);

        if (g_error_matches(g_error, DBUS_GERROR, DBUS_GERROR_NOT_SUPPORTED)) {
            /*Generally this means autolaunch failed because probably DISPLAY is unset*/
            connection = dbus_launch_moonshot();
            if (connection != NULL) {
                g_error_free(g_error);
                g_error = NULL;
            }
        }
        if (g_error != NULL) {
            *error = moonshot_error_new (MOONSHOT_ERROR_IPC_ERROR,
                                         "DBus error: %s",
                                         g_error->message);
            g_error_free (g_error);
            return NULL;
        }
    }


    dbconnection = dbus_g_connection_get_connection(connection);
    name_has_owner  = dbus_bus_name_has_owner (dbconnection,
                                               MOONSHOT_DBUS_NAME,
                                               &dbus_error);

    if (dbus_error_is_set (&dbus_error)) {
        *error = moonshot_error_new (MOONSHOT_ERROR_IPC_ERROR,
                                     "DBus error: %s",
                                     dbus_error.message);
        dbus_error_free (&dbus_error);
        return NULL;
    }

    if (! name_has_owner) {
        dbus_bus_start_service_by_name (dbconnection,
                                        MOONSHOT_DBUS_NAME,
                                        0,
                                        NULL,
                                        &dbus_error);

        if (dbus_error_is_set (&dbus_error)) {
            if (strcmp (dbus_error.name + 27, "ServiceUnknown") == 0) {
                /* Missing .service file; the moonshot-ui install is broken */
                *error = moonshot_error_new (MOONSHOT_ERROR_UNABLE_TO_START_SERVICE,
                                             "The Moonshot service was not found. "
                                             "Please make sure that moonshot-ui is "
                                             "correctly installed.");
            } else {
                *error = moonshot_error_new (MOONSHOT_ERROR_IPC_ERROR,
                                             "DBus error: %s",
                                             dbus_error.message);
            }
            dbus_error_free (&dbus_error);
            return NULL;
        }
    }

    /* Now the service should be running */
    g_error = NULL;

    g_proxy = dbus_g_proxy_new_for_name_owner (connection,
                                               MOONSHOT_DBUS_NAME,
                                               MOONSHOT_DBUS_PATH,
                                               MOONSHOT_DBUS_NAME,
                                               &g_error);

//.........这里部分代码省略.........

static DBusHandlerResult
message_filter(DBusConnection * connection, DBusMessage * message, void *data)
{
    struct systemd_logind_info *info = data;
    struct xf86_platform_device *pdev = NULL;
    InputInfoPtr pInfo = NULL;
    int ack = 0, pause = 0, fd = -1;
    DBusError error;
    dbus_int32_t major, minor;
    char *pause_str;

    dbus_error_init(&error);

    if (dbus_message_is_signal(message,
                               "org.freedesktop.DBus", "NameOwnerChanged")) {
        char *name, *old_owner, *new_owner;

        dbus_message_get_args(message, &error,
                              DBUS_TYPE_STRING, &name,
                              DBUS_TYPE_STRING, &old_owner,
                              DBUS_TYPE_STRING, &new_owner, DBUS_TYPE_INVALID);
        if (dbus_error_is_set(&error)) {
            LogMessage(X_ERROR, "systemd-logind: NameOwnerChanged: %s\n",
                       error.message);
            dbus_error_free(&error);
            return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
        }

        if (name && strcmp(name, "org.freedesktop.login1") == 0)
            FatalError("systemd-logind disappeared (stopped/restarted?)\n");

        return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
    }

    if (strcmp(dbus_message_get_path(message), info->session) != 0)
        return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;

    if (dbus_message_is_signal(message, "org.freedesktop.login1.Session",
                               "PauseDevice")) {
        if (!dbus_message_get_args(message, &error,
                               DBUS_TYPE_UINT32, &major,
                               DBUS_TYPE_UINT32, &minor,
                               DBUS_TYPE_STRING, &pause_str,
                               DBUS_TYPE_INVALID)) {
            LogMessage(X_ERROR, "systemd-logind: PauseDevice: %s\n",
                       error.message);
            dbus_error_free(&error);
            return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
        }

        if (strcmp(pause_str, "pause") == 0) {
            pause = 1;
            ack = 1;
        }
        else if (strcmp(pause_str, "force") == 0) {
            pause = 1;
        }
        else if (strcmp(pause_str, "gone") == 0) {
            /* Device removal is handled through udev */
            return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
        }
        else {
            LogMessage(X_WARNING, "systemd-logind: unknown pause type: %s\n",
                       pause_str);
            return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
        }
    }
    else if (dbus_message_is_signal(message, "org.freedesktop.login1.Session",
                                    "ResumeDevice")) {
        if (!dbus_message_get_args(message, &error,
                                   DBUS_TYPE_UINT32, &major,
                                   DBUS_TYPE_UINT32, &minor,
                                   DBUS_TYPE_UNIX_FD, &fd,
                                   DBUS_TYPE_INVALID)) {
            LogMessage(X_ERROR, "systemd-logind: ResumeDevice: %s\n",
                       error.message);
            dbus_error_free(&error);
            return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
        }
    } else
        return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;

    LogMessage(X_INFO, "systemd-logind: got %s for %u:%u\n",
               pause ? "pause" : "resume", major, minor);

    pdev = xf86_find_platform_device_by_devnum(major, minor);        
    if (!pdev)
        pInfo = systemd_logind_find_info_ptr_by_devnum(xf86InputDevs,
                                                       major, minor);
    if (!pdev && !pInfo) {
        LogMessage(X_WARNING, "systemd-logind: could not find dev %u:%u\n",
                   major, minor);
        return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
    }

    if (pause) {
        /* Our VT_PROCESS usage guarantees we've already given up the vt */
        info->active = info->vt_active = FALSE;
        /* Note the actual vtleave has already been handled by xf86Events.c */
        if (pdev)
//.........这里部分代码省略.........

static void
connect_hook(DBusConnection *connection, void *data)
{
    struct systemd_logind_info *info = data;
    DBusError error;
    DBusMessage *msg = NULL;
    DBusMessage *reply = NULL;
    dbus_int32_t arg;
    char *session = NULL;

    dbus_error_init(&error);

    msg = dbus_message_new_method_call("org.freedesktop.login1",
            "/org/freedesktop/login1", "org.freedesktop.login1.Manager",
            "GetSessionByPID");
    if (!msg) {
        LogMessage(X_ERROR, "systemd-logind: out of memory\n");
        goto cleanup;
    }

    arg = getpid();
    if (!dbus_message_append_args(msg, DBUS_TYPE_UINT32, &arg,
                                  DBUS_TYPE_INVALID)) {
        LogMessage(X_ERROR, "systemd-logind: out of memory\n");
        goto cleanup;
    }

    reply = dbus_connection_send_with_reply_and_block(connection, msg,
                                                      DBUS_TIMEOUT, &error);
    if (!reply) {
        LogMessage(X_ERROR, "systemd-logind: failed to get session: %s\n",
                   error.message);
        goto cleanup;
    }
    dbus_message_unref(msg);

    if (!dbus_message_get_args(reply, &error, DBUS_TYPE_OBJECT_PATH, &session,
                               DBUS_TYPE_INVALID)) {
        LogMessage(X_ERROR, "systemd-logind: GetSessionByPID: %s\n",
                   error.message);
        goto cleanup;
    }
    session = XNFstrdup(session);

    dbus_message_unref(reply);
    reply = NULL;


    msg = dbus_message_new_method_call("org.freedesktop.login1",
            session, "org.freedesktop.login1.Session", "TakeControl");
    if (!msg) {
        LogMessage(X_ERROR, "systemd-logind: out of memory\n");
        goto cleanup;
    }

    arg = FALSE; /* Don't forcibly take over over the session */
    if (!dbus_message_append_args(msg, DBUS_TYPE_BOOLEAN, &arg,
                                  DBUS_TYPE_INVALID)) {
        LogMessage(X_ERROR, "systemd-logind: out of memory\n");
        goto cleanup;
    }

    reply = dbus_connection_send_with_reply_and_block(connection, msg,
                                                      DBUS_TIMEOUT, &error);
    if (!reply) {
        LogMessage(X_ERROR, "systemd-logind: TakeControl failed: %s\n",
                   error.message);
        goto cleanup;
    }

    dbus_bus_add_match(connection,
        "type='signal',sender='org.freedesktop.DBus',interface='org.freedesktop.DBus',member='NameOwnerChanged',path='/org/freedesktop/DBus'",
        &error);
    if (dbus_error_is_set(&error)) {
        LogMessage(X_ERROR, "systemd-logind: could not add match: %s\n",
                   error.message);
        goto cleanup;
    }

    /*
     * HdG: This is not useful with systemd <= 208 since the signal only
     * contains invalidated property names there, rather than property, val
     * pairs as it should.  Instead we just use the first resume / pause now.
     */
#if 0
    snprintf(match, sizeof(match),
        "type='signal',sender='org.freedesktop.login1',interface='org.freedesktop.DBus.Properties',member='PropertiesChanged',path='%s'",
        session);
    dbus_bus_add_match(connection, match, &error);
    if (dbus_error_is_set(&error)) {
        LogMessage(X_ERROR, "systemd-logind: could not add match: %s\n",
                   error.message);
        goto cleanup;
    }
#endif

    if (!dbus_connection_add_filter(connection, message_filter, info, NULL)) {
        LogMessage(X_ERROR, "systemd-logind: could not add filter: %s\n",
                   error.message);
        goto cleanup;
//.........这里部分代码省略.........

void* DBusCreate(FcitxInstance* instance)
{
    FcitxDBus *dbusmodule = (FcitxDBus*) fcitx_utils_malloc0(sizeof(FcitxDBus));
    FcitxAddon* dbusaddon = FcitxAddonsGetAddonByName(FcitxInstanceGetAddons(instance), FCITX_DBUS_NAME);
    dbusmodule->owner = instance;

    DBusError err;

    if (FcitxInstanceIsTryReplace(instance)) {
        fcitx_utils_launch_tool("fcitx-remote", "-e");
        sleep(1);
    }

    dbus_threads_init_default();

    // first init dbus
    dbus_error_init(&err);

    int retry = 0;
    DBusConnection* conn = NULL;
    char* servicename = NULL;
    asprintf(&servicename, "%s-%d", FCITX_DBUS_SERVICE,
             fcitx_utils_get_display_number());

    /* do session dbus initialize */
    do {
        if (!getenv("DISPLAY") && !getenv("DBUS_SESSION_BUS_ADDRESS")) {
            FcitxLog(WARNING, "Without DISPLAY or DBUS_SESSION_BUS_ADDRESS session bus will not work");
            break;
        }
        /* try to get session dbus */
        while (1) {
            conn = dbus_bus_get(DBUS_BUS_SESSION, &err);
            if (dbus_error_is_set(&err)) {
                FcitxLog(WARNING, "Connection Error (%s)", err.message);
                dbus_error_free(&err);
                dbus_error_init(&err);
            }

            if (NULL == conn && retry < MAX_RETRY_TIMES) {
                retry ++;
                sleep(RETRY_INTERVAL * retry);
            } else {
                break;
            }
        }

        if (NULL == conn) {
            break;
        }

        if (!dbus_connection_add_filter(conn, DBusModuleFilter, dbusmodule, NULL))
            break;

        if (!dbus_connection_set_watch_functions(conn, DBusAddWatch, DBusRemoveWatch,
                NULL, &dbusmodule->watches, NULL)) {
            FcitxLog(WARNING, "Add Watch Function Error");
            dbus_error_free(&err);
            dbus_error_init(&err);
            dbus_connection_unref(conn);
            conn = NULL;
            break;
        }

        /* from here we know dbus connection is successful, now we need to register the service */
        dbus_connection_set_exit_on_disconnect(conn, FALSE);
        dbusmodule->conn = conn;

        boolean request_retry = false;

        int replaceCountdown = FcitxInstanceIsTryReplace(instance) ? 3 : 0;
        FcitxInstanceResetTryReplace(instance);
        do {
            request_retry = false;

            // request a name on the bus
            int ret = dbus_bus_request_name(conn, servicename,
                                            DBUS_NAME_FLAG_DO_NOT_QUEUE,
                                            &err);
            if (dbus_error_is_set(&err)) {
                FcitxLog(WARNING, "Name Error (%s)", err.message);
                goto dbus_init_failed;
            }
            if (DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER != ret) {
                FcitxLog(WARNING, "DBus Service Already Exists");

                if (replaceCountdown > 0) {
                    replaceCountdown --;
                    fcitx_utils_launch_tool("fcitx-remote", "-e");

                    /* sleep for a while and retry */
                    sleep(1);

                    request_retry = true;
                    continue;
                }

                /* if we know fcitx exists, we should exit. */
                dbus_error_free(&err);
                free(servicename);
//.........这里部分代码省略.........

void listen_signal()
{
    DBusMessage *msg;
    DBusMessageIter arg;
    DBusConnection *connection;
    DBusError err;
    int ret;
    char *sigvalue;

    //step 1. connect DBus
    dbus_error_init(&err);
    connection = dbus_bus_get(DBUS_BUS_SESSION, &err);
    if (dbus_error_is_set(&err)) {
        fprintf(stderr, "Connection Error %s\n", err.message);
        dbus_error_free(&err);
    }
    if (connection == NULL) {
        return;
    }

    //step 2. [OPTION] Assign a known name for connection
    ret = dbus_bus_request_name(connection, "test.singal.dest", DBUS_NAME_FLAG_REPLACE_EXISTING, &err);
    if (dbus_error_is_set(&err)) {
        fprintf(stderr, "Name Error %s\n", err.message);
        dbus_error_free(&err);
    }
    if (ret != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
        return ;
    }

    //step 3. Notify DBus daemon, listen test.signal.Type signal
    dbus_bus_add_match(connection, "type='signal', interface='test.signal.Type'", &err);
    dbus_connection_flush(connection);
    if (dbus_error_is_set(&err)) {
        fprintf(stderr, "Match Error %s\n", err.message);
        dbus_error_free(&err);
    }

    //step 4. listen in loop per 1s.
    while (1) {
        dbus_connection_read_write(connection, 0);
        msg = dbus_connection_pop_message(connection);
        if (msg == NULL) {
            sleep(1);
            continue;
        }

        if (dbus_message_is_signal(msg, "test.signal.Type", "Test")) {
            if (!dbus_message_iter_init(msg, &arg)) {
                fprintf(stderr, "Message Has no Param");
            } else if (dbus_message_iter_get_arg_type(&arg) != DBUS_TYPE_STRING) {
                g_printerr("Param is not string");
            } else {
                dbus_message_iter_get_basic(&arg, &sigvalue);
                printf("Got singal with value: %s\n", sigvalue);
            }
        }
    
        dbus_message_unref(msg);

    }//End of while
}

int
add_network_printer(LibHalContext *ctx, char *base, char *hostaddr,
		char *device, char *community)
{
	DBusError error;
	int rc = -1;
	char udi[128];
	char *tmp_udi = NULL;
	static char *parent = NULL;
	char *manufacturer = NULL, *model = NULL, *description = NULL,
	     *uri = NULL, *sn, *serial;

	sn = serial = pseudo_serialno_from_addr(hostaddr);

	if (parent == NULL)
		parent = getenv("UDI");

	dbus_error_init(&error);

	network_device_name_to_udi(udi, sizeof (udi), base, serial, NULL);

	if (libhal_device_exists(ctx, udi, &error) == TRUE)
		goto out;

	if ((tmp_udi = libhal_new_device(ctx, &error)) == NULL)
		goto out;

	snmp_printer_info(hostaddr, community, &manufacturer, &model,
			&description, &serial, NULL, &uri);

	libhal_device_set_property_string(ctx, tmp_udi,
			"info.parent", parent, &error);

	libhal_device_set_property_string(ctx, tmp_udi,
			"info.category", "printer", &error);

	libhal_device_property_strlist_append(ctx, tmp_udi,
				"info.capabilities", "printer", &error);
	libhal_device_property_strlist_append(ctx, tmp_udi,
				"info.capabilities", "network_device", &error);

	libhal_device_set_property_string(ctx, tmp_udi,
			"network_device.address", hostaddr, &error);

	if ((community != NULL) && (strcasecmp(community, "public") != 0))
		libhal_device_set_property_string(ctx, tmp_udi,
			"network_device.snmp_community", community, &error);

	if ((uri != NULL) || (device != NULL))
		libhal_device_set_property_string(ctx, tmp_udi,
			"printer.device", (uri ? uri : device), &error);

	if (serial != NULL)
		libhal_device_set_property_string(ctx, tmp_udi,
			"printer.serial", serial, &error);

	if (manufacturer != NULL)
		libhal_device_set_property_string(ctx, tmp_udi,
			"printer.vendor", manufacturer, &error);

	if (model != NULL)
		libhal_device_set_property_string(ctx, tmp_udi,
			"printer.product", model, &error);

	if (description != NULL)
		libhal_device_set_property_string(ctx, tmp_udi,
			"printer.description", description, &error);

	/* commit the changes to the new UDI */
	rc = libhal_device_commit_to_gdl(ctx, tmp_udi, udi, &error);

out:
	HAL_DEBUG(("result: %s (%s): %s, %s, %s, %s, %s", hostaddr, udi,
		NP(manufacturer), NP(model), NP(description), NP(serial),
		NP(uri)));

	if (tmp_udi != NULL)
		free(tmp_udi);
	if (manufacturer != NULL)
		free(manufacturer);
	if (model != NULL)
		free(model);
	if (description != NULL)
		free(description);
	if (uri != NULL)
		free(uri);
	if (sn != NULL)
		free(sn);

	if (dbus_error_is_set(&error)) {
		HAL_WARNING(("%s: %s", error.name, error.message));
		dbus_error_free(&error);
	}

	HAL_DEBUG(("add: %s (%s)", hostaddr, udi));

	return (rc);
}

static void track_pulseaudio_on_dbus(pa_context *c, DBusBusType type, pa_dbus_wrap_connection **conn) {
    DBusError error;

    pa_assert(c);
    pa_assert(conn);

    dbus_error_init(&error);

    if (!(*conn = pa_dbus_wrap_connection_new(c->mainloop, c->use_rtclock, type, &error)) || dbus_error_is_set(&error)) {
        pa_log_warn("Unable to contact DBUS: %s: %s", error.name, error.message);
        goto fail;
    }

    if (!dbus_connection_add_filter(pa_dbus_wrap_connection_get(*conn), filter_cb, c, NULL)) {
        pa_log_warn("Failed to add filter function");
        goto fail;
    }
    c->filter_added = TRUE;

    if (pa_dbus_add_matches(
                pa_dbus_wrap_connection_get(*conn), &error,
                "type='signal',sender='" DBUS_SERVICE_DBUS "',interface='" DBUS_INTERFACE_DBUS "',member='NameOwnerChanged',arg0='org.pulseaudio.Server',arg1=''", NULL) < 0) {

        pa_log_warn("Unable to track org.pulseaudio.Server: %s: %s", error.name, error.message);
        goto fail;
    }

    return;

fail:
    if (*conn) {
        pa_dbus_wrap_connection_free(*conn);
        *conn = NULL;
    }

    dbus_error_free(&error);
}