chrome/chrome_watcher/chrome_watcher_main.cc

   1 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <windows.h>
   6
   7 #include "base/at_exit.h"
   8 #include "base/command_line.h"
   9 #include "base/logging_win.h"
  10 #include "base/template_util.h"
  11 #include "components/browser_watcher/exit_code_watcher_win.h"
  12 #include "components/browser_watcher/watcher_main_api_win.h"
  13
  14 namespace {
  15
  16 // Use the same log facility as Chrome for convenience.
  17 // {7FE69228-633E-4f06-80C1-527FEA23E3A7}
  18 const GUID kChromeWatcherTraceProviderName = {
  19     0x7fe69228, 0x633e, 0x4f06,
  20         { 0x80, 0xc1, 0x52, 0x7f, 0xea, 0x23, 0xe3, 0xa7 } };
  21
  22 }  // namespace
  23
  24 // The main entry point to the watcher, declared as extern "C" to avoid name
  25 // mangling.
  26 extern "C" int WatcherMain(const base::char16* registry_path) {
  27   // The exit manager is in charge of calling the dtors of singletons.
  28   base::AtExitManager exit_manager;
  29   // Initialize the commandline singleton from the environment.
  30   base::CommandLine::Init(0, NULL);
  31
  32   logging::LogEventProvider::Initialize(kChromeWatcherTraceProviderName);
  33
  34   // Arrange to be shut down as late as possible, as we want to outlive
  35   // chrome.exe in order to report its exit status.
  36   // TODO(siggi): Does this (windowless) process need to register a console
  37   //     handler too, in order to get notice of logoff events?
  38   ::SetProcessShutdownParameters(0x100, SHUTDOWN_NORETRY);
  39
  40   browser_watcher::ExitCodeWatcher exit_code_watcher(registry_path);
  41   int ret = 1;
  42   // Attempt to wait on our parent process, and record its exit status.
  43   if (exit_code_watcher.ParseArguments(
  44         *base::CommandLine::ForCurrentProcess())) {
  45     // Wait on the process.
  46     exit_code_watcher.WaitForExit();
  47     ret = 0;
  48   }
  49
  50   // Wind logging down.
  51   logging::LogEventProvider::Uninitialize();
  52
  53   return ret;
  54 }
  55
  56 static_assert(base::is_same<decltype(&WatcherMain),
  57                             browser_watcher::WatcherMainFunction>::value,
  58               "WatcherMain() has wrong type");