Browser watcher, part deux.

components/browser_watcher/watcher_win.h

-// 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.
-#ifndef COMPONENTS_BROWSER_WATCHER_WATCHER_WIN_H_
-#define COMPONENTS_BROWSER_WATCHER_WATCHER_WIN_H_
-
-#include "base/macros.h"
-#include "base/process/process_handle.h"
-#include "base/strings/string16.h"
-#include "base/time/time.h"
-#include "base/win/scoped_handle.h"
-
-namespace base {
-class CommandLine;
-}
-
-namespace browser_watcher {
-
-// Watches for the exit code of a process and records it in a given registry
-// location.
-class ExitCodeWatcher {
- public:
-  // Name of the switch used for the parent process handle.
-  static const char kParenthHandleSwitch[];
-
-  // Initialize the watcher with a registry path.
-  explicit ExitCodeWatcher(const base::char16* registry_path);
-  ~ExitCodeWatcher();
-
-  // Initializes from arguments on |cmd_line|, returns true on success.
-  // This function expects the process handle indicated by kParentHandleSwitch
-  // in |cmd_line| to be open with sufficient privilege to wait and retrieve
-  // the process exit code.
-  // It checks the handle for validity and takes ownership of it.
-  // The intent is for this handle to be inherited into the watcher process
-  // hosting the instance of this class.
-  bool ParseArguments(const base::CommandLine& cmd_line);
-
-  // Waits for the process to exit and records its exit code in registry.
-  // This is a blocking call.
-  void WaitForExit();
-
-  base::ProcessHandle process() const { return process_.Get(); }
-
- private:
-  // Writes |exit_code| to registry, returns true on success.
-  bool WriteProcessExitCode(int exit_code);
-
-  // The registry path the exit codes are written to.
-  base::string16 registry_path_;
-
-  // Handle, PID, and creation time of the watched process.
-  base::win::ScopedHandle process_;
-  base::ProcessId process_pid_;
-  base::Time process_creation_time_;
-
-  DISALLOW_COPY_AND_ASSIGN(ExitCodeWatcher);
-};
-
-}  // namespace browser_watcher
-
-#endif  // COMPONENTS_BROWSER_WATCHER_WATCHER_WIN_H_