port to use centralized constants files, and add input validation

signaller.cc

 // Copyright (c) 2009-2010 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.
 
 // Not intended for use on the system, this is a handy helper binary for
 // manually testing the session_manager.  It may find its way into
 // autotest-based tests of this component.
 
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <signal.h>
 #include <stdio.h>
 #include <unistd.h>
 
 #include <base/basictypes.h>
 #include <base/command_line.h>
 #include <base/logging.h>
 #include <chromeos/dbus/dbus.h>
+#include <chromeos/dbus/service_constants.h>
 #include "login_manager/ipc_channel.h"
 #include "login_manager/bindings/client.h"
-#include "login_manager/constants.h"
 
 namespace switches {
 static const char kExitSad[] = "exit-sad";
 static const char kSuicide[] = "suicide";
 static const char kSessionPipe[] = "session-manager-pipe";
 }
 
 int main(int argc, char* argv[]) {
   CommandLine::Init(argc, argv);
   logging::InitLogging(NULL,
@@ skipping 39 matching lines @@
                                                          errptr)) {
     // TODO(cmasone): make a util function in for this error-message check.
     LOG(WARNING) << "StopSession failed: "
         << (error->message ? error->message : "Unknown Error.");
   }
   LOG_IF(ERROR, !done) << "stop did not complete?";
   LOG_IF(INFO, done) << "Call completed";
 
   exit(exit_val);
 }