Browser watcher end-end-to-end .

components/browser_watcher/watcher_main_win.cc

+// Copyright (c) 2014 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.
+
+#include "base/at_exit.h"
+#include "base/command_line.h"
+#include "base/logging_win.h"
+#include "components/browser_watcher/watcher_main_api_win.h"
+#include "components/browser_watcher/watcher_win.h"
+
+namespace {
+
+// Use the same log facility as Chrome for convenience.
+// {7FE69228-633E-4f06-80C1-527FEA23E3A7}
+const GUID kChromeWatcherTraceProviderName = {
+    0x7fe69228, 0x633e, 0x4f06,
+        { 0x80, 0xc1, 0x52, 0x7f, 0xea, 0x23, 0xe3, 0xa7 } };
+
+}  // namespace
+
+// The main entry point to the watcher, declared as extern "C" to avoid name
+// mangling.
+extern "C" int __declspec(dllexport) WatcherMain(const wchar_t* registry_path) {
+  // The exit manager is in charge of calling the dtors of singletons.
+  base::AtExitManager exit_manager;
+  // Initialize the commandline singleton from the environment.
+  base::CommandLine::Init(0, NULL);
+
+  logging::LogEventProvider::Initialize(kChromeWatcherTraceProviderName);
+
+  // Arrange to be shut down as late as possible, as we want to outlive
+  // chrome.exe in order to report its exit status.
+  // TODO(siggi): Does this (windowless) process need to register a console
+  //     handler too, in order to get notice of logoff events?
+  ::SetProcessShutdownParameters(0x100, SHUTDOWN_NORETRY);
+
+  browser_watcher::ExitCodeWatcher exit_code_watcher(registry_path);
+  int ret = 1;
+  // Attempt to wait on our parent process, and record its exit status.
+  if (exit_code_watcher.ParseArguments(
+        *base::CommandLine::ForCurrentProcess())) {
+    // Wait on the process.
+    exit_code_watcher.WaitForExit();
+    ret = 0;
+  }
+
+  // Wind logging down.
+  logging::LogEventProvider::Uninitialize();
+
+  return ret;
+}
+
+namespace {
+
+void CompileAsserts() {
+  // Make sure the exported function's type matches the typedef.
+  browser_watcher::WatcherMainFunction fn = &WatcherMain;
+}
+
+}  // namespace