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// Copyright (c) 2012 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_WIN_SCOPED_PROCESS_INFORMATION_H_
#define BASE_WIN_SCOPED_PROCESS_INFORMATION_H_
#pragma once
#include <windows.h>
#include "base/basictypes.h"
#include "base/base_export.h"
namespace base {
namespace win {
// Manages the closing of process and thread handles from PROCESS_INFORMATION
// structures. Allows clients to take ownership of either handle independently.
class BASE_EXPORT ScopedProcessInformation {
public:
// Creates an instance holding a null PROCESS_INFORMATION.
ScopedProcessInformation();
// Closes the held thread and process handles, if any.
~ScopedProcessInformation();
// Returns a pointer that may be passed to API calls such as CreateProcess.
// DCHECKs that the object is not currently holding any handles.
// HANDLEs stored in the returned PROCESS_INFORMATION will be owned by this
// instance.
PROCESS_INFORMATION* Receive();
// Returns true iff this instance is holding a thread and/or process handle.
bool IsValid() const;
// Closes the held thread and process handles, if any, and resets the held
// PROCESS_INFORMATION to null.
void Close();
// Swaps contents with the other ScopedProcessInformation.
void Swap(ScopedProcessInformation* other);
// Populates this instance with duplicate handles and the thread/process IDs
// from |other|. Returns false in case of failure, in which case this instance
// will be completely unpopulated.
bool DuplicateFrom(const ScopedProcessInformation& other);
// Transfers ownership of the held PROCESS_INFORMATION, if any, away from this
// instance. Resets the held PROCESS_INFORMATION to null.
PROCESS_INFORMATION Take();
// Transfers ownership of the held process handle, if any, away from this
// instance. The hProcess and dwProcessId members of the held
// PROCESS_INFORMATION will be reset.
HANDLE TakeProcessHandle();
// Transfers ownership of the held thread handle, if any, away from this
// instance. The hThread and dwThreadId members of the held
// PROCESS_INFORMATION will be reset.
HANDLE TakeThreadHandle();
// Returns the held process handle, if any, while retaining ownership.
HANDLE process_handle() const {
return process_information_.hProcess;
}
// Returns the held thread handle, if any, while retaining ownership.
HANDLE thread_handle() const {
return process_information_.hThread;
}
// Returns the held process id, if any.
DWORD process_id() const {
return process_information_.dwProcessId;
}
// Returns the held thread id, if any.
DWORD thread_id() const {
return process_information_.dwThreadId;
}
private:
// Resets the held PROCESS_INFORMATION to null.
void Reset();
PROCESS_INFORMATION process_information_;
DISALLOW_COPY_AND_ASSIGN(ScopedProcessInformation);
};
} // namespace win
} // namespace base
#endif // BASE_WIN_SCOPED_PROCESS_INFORMATION_H_
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