Update linux host to handle SIGHUP. use it to reload config.

remoting/host/remoting_me2me_host.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.
 //
 // This file implements a standalone host process for Me2Me.
 
 #include <string>
 
 #include "base/at_exit.h"
 #include "base/bind.h"
@@ skipping 31 matching lines @@
 #include "remoting/host/log_to_server.h"
 #include "remoting/host/network_settings.h"
 #include "remoting/host/policy_hack/policy_watcher.h"
 #include "remoting/host/session_manager_factory.h"
 #include "remoting/host/signaling_connector.h"
 #include "remoting/host/usage_stats_consent.h"
 #include "remoting/host/video_frame_capturer.h"
 #include "remoting/jingle_glue/xmpp_signal_strategy.h"
 #include "remoting/protocol/me2me_host_authenticator_factory.h"
 
+#if defined(OS_POSIX)
+#include "remoting/host/posix/sighup_listener.h"
+#endif  // defined(OS_POSIX)
+
 #if defined(OS_MACOSX)
 #include "base/mac/scoped_cftyperef.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
 #include "remoting/host/curtain_mode_mac.h"
-#include "remoting/host/sighup_listener_mac.h"
-#endif
+#endif  // defined(OS_MACOSX)
+
 // N.B. OS_WIN is defined by including src/base headers.
 #if defined(OS_WIN)
 #include <commctrl.h>
-#endif
+#endif  // defined(OS_WIN)
+
 #if defined(TOOLKIT_GTK)
 #include "ui/gfx/gtk_util.h"
-#endif
+#endif  // defined(TOOLKIT_GTK)
 
 namespace {
 
 // This is used for tagging system event logs.
 const char kApplicationName[] = "chromoting";
 
 // These are used for parsing the config-file locations from the command line,
 // and for defining the default locations if the switches are not present.
 const char kAuthConfigSwitchName[] = "auth-config";
 const char kHostConfigSwitchName[] = "host-config";
@@ skipping 106 matching lines @@
 
    private:
     scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
     base::Closure callback_;
 
     DISALLOW_COPY_AND_ASSIGN(ConfigChangedDelegate);
   };
 #endif  // defined(OS_WIN)
 
   void ListenForConfigChanges() {
-#if defined(OS_MACOSX)
+#if defined(OS_POSIX)
     remoting::RegisterHupSignalHandler(
         base::Bind(&HostProcess::ConfigUpdatedDelayed, base::Unretained(this)));
 #elif defined(OS_WIN)
     scoped_refptr<base::files::FilePathWatcher::Delegate> delegate(
         new ConfigChangedDelegate(
             message_loop_.message_loop_proxy(),
             base::Bind(&HostProcess::ConfigUpdated, base::Unretained(this))));
     config_watcher_.reset(new base::files::FilePathWatcher());
     if (!config_watcher_->Watch(host_config_path_, delegate)) {
       LOG(ERROR) << "Couldn't watch file " << host_config_path_.value();
     }
-#endif
+#endif  // defined (OS_WIN)
   }
 
   void CreateAuthenticatorFactory() {
     DCHECK(context_->network_task_runner()->BelongsToCurrentThread());
     scoped_ptr<protocol::AuthenticatorFactory> factory(
         new protocol::Me2MeHostAuthenticatorFactory(
             key_pair_.GenerateCertificate(),
             *key_pair_.private_key(), host_secret_hash_));
     host_->SetAuthenticatorFactory(factory.Pass());
   }
@@ skipping 484 matching lines @@
             user32.GetFunctionPointer("SetProcessDPIAware"));
     set_process_dpi_aware();
   }
 
   // CommandLine::Init() ignores the passed |argc| and |argv| on Windows getting
   // the command line from GetCommandLineW(), so we can safely pass NULL here.
   return main(0, NULL);
 }
 
 #endif  // defined(OS_WIN)