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// Copyright (c) 2011 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.
#pragma once
#include "base/base_api.h"
#include "base/basictypes.h"
#include "build/build_config.h"
#include <sys/types.h>
#if defined(OS_WIN)
#include <windows.h>
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(OS_WIN)
typedef HANDLE ProcessHandle;
typedef DWORD ProcessId;
typedef HANDLE UserTokenHandle;
const ProcessHandle kNullProcessHandle = NULL;
const ProcessId kNullProcessId = 0;
#elif defined(OS_POSIX)
// On POSIX, our ProcessHandle will just be the PID.
typedef pid_t ProcessHandle;
typedef pid_t ProcessId;
const ProcessHandle kNullProcessHandle = 0;
const ProcessId kNullProcessId = 0;
#endif // defined(OS_WIN)
#if defined(OS_POSIX) && !defined(OS_MACOSX)
// saved_priority_ will be set to this to indicate that it's not holding
// a valid value. -20 to 19 are valid process priorities.
const int kUnsetProcessPriority = 256;
class BASE_API Process {
Process() : process_(kNullProcessHandle) {
#if defined(OS_POSIX) && !defined(OS_MACOSX)
saved_priority_ = kUnsetProcessPriority;
explicit Process(ProcessHandle handle) : process_(handle) {
#if defined(OS_POSIX) && !defined(OS_MACOSX)
saved_priority_ = kUnsetProcessPriority;
// A handle to the current process.
static Process Current();
// Get/Set the handle for this process. The handle will be 0 if the process
// is no longer running.
ProcessHandle handle() const { return process_; }
void set_handle(ProcessHandle handle) {
process_ = handle;
#if defined(OS_POSIX) && !defined(OS_MACOSX)
saved_priority_ = kUnsetProcessPriority;
// Get the PID for this process.
ProcessId pid() const;
// Is the this process the current process.
bool is_current() const;
// Close the process handle. This will not terminate the process.
void Close();
// Terminates the process with extreme prejudice. The given result code will
// be the exit code of the process. If the process has already exited, this
// will do nothing.
void Terminate(int result_code);
// A process is backgrounded when it's priority is lower than normal.
// Return true if this process is backgrounded, false otherwise.
bool IsProcessBackgrounded() const;
// Set a process as backgrounded. If value is true, the priority
// of the process will be lowered. If value is false, the priority
// of the process will be made "normal" - equivalent to default
// process priority.
// Returns true if the priority was changed, false otherwise.
bool SetProcessBackgrounded(bool value);
// Returns an integer representing the priority of a process. The meaning
// of this value is OS dependent.
int GetPriority() const;
ProcessHandle process_;
#if defined(OS_POSIX) && !defined(OS_MACOSX)
// Holds the priority that the process was set to when it was backgrounded.
// If the process wasn't backgrounded it will be kUnsetProcessPriority.
int saved_priority_;
} // namespace base
#endif // BASE_PROCESS_H_
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