Call dbus_bus_register at the beginning of connection.

dbus/bus.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // TODO(satorux):
 // - Handle "disconnected" signal.
 
 #include "dbus/bus.h"
 
 #include "base/bind.h"
@@ skipping 290 matching lines @@
       connection_ = dbus_bus_get_private(dbus_bus_type, error.get());
     } else {
       connection_ = dbus_bus_get(dbus_bus_type, error.get());
     }
   }
   if (!connection_) {
     LOG(ERROR) << "Failed to connect to the bus: "
                << (error.is_set() ? error.message() : "");
     return false;
   }
+
+  if (bus_type_ == CUSTOM_ADDRESS) {
+    // We should call dbus_bus_register here, otherwise unique name can not be
+    // acquired. According to dbus specification, it is responsible to call
+    // org.freedesktop.DBus.Hello method at the beging of bus connection to
+    // acquire unique name. In the case of dbus_bus_get, dbus_bus_register is
+    // called internally.
+    if (!dbus_bus_register(connection_, error.get())) {
+      LOG(ERROR) << "Failed to register the bus component: "
+                 << (error.is_set() ? error.message() : "");
+      return false;
+    }
+  }
   // We shouldn't exit on the disconnected signal.
   dbus_connection_set_exit_on_disconnect(connection_, false);
 
   return true;
 }
 
 void Bus::ShutdownAndBlock() {
   AssertOnDBusThread();
 
   // Unregister the exported objects.
@@ skipping 509 matching lines @@
 }
 
 void Bus::OnDispatchStatusChangedThunk(DBusConnection* connection,
                                        DBusDispatchStatus status,
                                        void* data) {
   Bus* self = static_cast<Bus*>(data);
   self->OnDispatchStatusChanged(connection, status);
 }
 
 }  // namespace dbus