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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.
#ifndef BASE_PROCESS_PROCESS_PROCESS_H_
#define BASE_PROCESS_PROCESS_PROCESS_H_
#include "base/base_export.h"
#include "base/basictypes.h"
#include "base/move.h"
#include "base/process/process_handle.h"
#include "build/build_config.h"
#if defined(OS_WIN)
#include "base/win/scoped_handle.h"
#endif
namespace base {
// Provides a move-only encapsulation of a process.
//
// This object is not tied to the lifetime of the underlying process: the
// process may be killed and this object may still around, and it will still
// claim to be valid. The actual behavior in that case is OS dependent like so:
//
// Windows: The underlying ProcessHandle will be valid after the process dies
// and can be used to gather some information about that process, but most
// methods will obviously fail.
//
// POSIX: The underlying PorcessHandle is not guaranteed to remain valid after
// the process dies, and it may be reused by the system, which means that it may
// end up pointing to the wrong process.
class BASE_EXPORT Process {
MOVE_ONLY_TYPE_FOR_CPP_03(Process, RValue)
public:
explicit Process(ProcessHandle handle = kNullProcessHandle);
// Move constructor for C++03 move emulation of this type.
Process(RValue other);
// The destructor does not terminate the process.
~Process() {}
// Move operator= for C++03 move emulation of this type.
Process& operator=(RValue other);
// Returns an object for the current process.
static Process Current();
// Returns true if processes can be backgrounded.
static bool CanBackgroundProcesses();
// Returns true if this objects represents a valid process.
bool IsValid() const;
// Returns a handle for this process. There is no guarantee about when that
// handle becomes invalid because this object retains ownership.
ProcessHandle Handle() const;
// Returns a second object that represents this process.
Process Duplicate() const;
// Get the PID for this process.
ProcessId pid() const;
// Returns true if this process is 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.
// NOTE: On POSIX |result_code| is ignored.
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;
private:
#if defined(OS_WIN)
bool is_current_process_;
win::ScopedHandle process_;
#else
ProcessHandle process_;
#endif
};
} // namespace base
#endif // BASE_PROCESS_PROCESS_PROCESS_H_
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