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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

// Copyright (c) 2006-2008 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 BASE_PROCESS_H_

#define BASE_PROCESS_H_

#include "base/basictypes.h"

#include <sys/types.h>

#ifdef XP_WIN

#  include <windows.h>

#endif

namespace base {

// ProcessHandle is a platform specific type which represents the underlying OS

// handle to a process.

// ProcessId is a number which identifies the process in the OS.

#if defined(XP_WIN)

typedef HANDLE ProcessHandle;

typedef DWORD ProcessId;

// inttypes.h-like macro for ProcessId formatting.

#  define PRIPID "lu"

const ProcessHandle kInvalidProcessHandle = INVALID_HANDLE_VALUE;

// In theory, on Windows, this is a valid process ID, but in practice they are

// currently divisible by four. Process IDs share the kernel handle allocation

// code and they are guaranteed to be divisible by four.

// As this could change for process IDs we shouldn't generally rely on this

// property, however even if that were to change, it seems safe to rely on this

// particular value never being used.

const ProcessId kInvalidProcessId = kuint32max;

#else

// On POSIX, our ProcessHandle will just be the PID.

typedef pid_t ProcessHandle;

typedef pid_t ProcessId;

// inttypes.h-like macro for ProcessId formatting.

#  define PRIPID "d"

const ProcessHandle kInvalidProcessHandle = -1;

const ProcessId kInvalidProcessId = -1;

#endif

}  // namespace base

#endif  // BASE_PROCESS_H_