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// 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_CLIENT_WIN_H_
#define COMPONENTS_BROWSER_WATCHER_WATCHER_CLIENT_WIN_H_
#include "base/callback.h"
#include "base/macros.h"
#include "base/process/process.h"
namespace base {
class CommandLine;
} // namespace base
namespace browser_watcher {
// An interface class to take care of the details in launching a browser
// watch process.
class WatcherClient {
public:
// A CommandLineGenerator generates command lines that will launch a separate
// process and pass the supplied HANDLE to ExitCodeWatcher in that process.
typedef base::Callback<base::CommandLine(HANDLE)> CommandLineGenerator;
// Constructs a watcher client that launches its watcher process using the
// command line generated by |command_line_generator|.
explicit WatcherClient(const CommandLineGenerator& command_line_generator);
// Launches the watcher process such that the child process is able to inherit
// a handle to the current process. If use_legacy_launch() is true, this uses
// a non-threadsafe legacy launch mode that's compatible with Windows XP.
void LaunchWatcher();
// Accessors, exposed only for testing.
bool use_legacy_launch() const { return use_legacy_launch_; }
void set_use_legacy_launch(bool use_legacy_launch) {
use_legacy_launch_ = use_legacy_launch;
}
base::ProcessHandle process() const { return process_.Handle(); }
private:
// If true, the watcher process will be launched with XP legacy handle
// inheritance. This is not thread safe and can leak random handles into the
// child process, but it's the best we can do on XP.
bool use_legacy_launch_;
// The CommandLineGenerator passed to the constructor.
CommandLineGenerator command_line_generator_;
// A handle to the launched watcher process. Valid after a successful
// LaunchWatcher() call.
base::Process process_;
DISALLOW_COPY_AND_ASSIGN(WatcherClient);
};
} // namespace browser_watcher
#endif // COMPONENTS_BROWSER_WATCHER_WATCHER_CLIENT_WIN_H_
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