107 lines
3.2 KiB
C
107 lines
3.2 KiB
C
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_WIN_SCOPED_PROCESS_INFORMATION_H_
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#define BASE_WIN_SCOPED_PROCESS_INFORMATION_H_
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#include <windows.h>
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#include "base/basictypes.h"
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#include "base/base_export.h"
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#include "base/win/scoped_handle.h"
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namespace base {
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namespace win {
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// Manages the closing of process and thread handles from PROCESS_INFORMATION
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// structures. Allows clients to take ownership of either handle independently.
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class BASE_EXPORT ScopedProcessInformation {
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public:
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// Helper object to contain the effect of Receive() to the funtion that needs
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// a pointer.
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class Receiver {
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public:
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explicit Receiver(ScopedProcessInformation* owner)
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: info_(),
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owner_(owner) {}
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~Receiver() { owner_->Set(info_); }
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operator PROCESS_INFORMATION*() { return &info_; }
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private:
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PROCESS_INFORMATION info_;
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ScopedProcessInformation* owner_;
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};
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ScopedProcessInformation();
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~ScopedProcessInformation();
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// Returns an object that may be passed to API calls such as CreateProcess.
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// DCHECKs that the object is not currently holding any handles.
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// HANDLEs stored in the returned PROCESS_INFORMATION will be owned by this
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// instance.
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// The intended use case is something like this:
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// if (::CreateProcess(..., startup_info, scoped_proces_info.Receive()))
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Receiver Receive();
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// Returns true iff this instance is holding a thread and/or process handle.
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bool IsValid() const;
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// Closes the held thread and process handles, if any.
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void Close();
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// Populates this instance with the provided |process_info|.
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void Set(const PROCESS_INFORMATION& process_info);
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// Populates this instance with duplicate handles and the thread/process IDs
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// from |other|. Returns false in case of failure, in which case this instance
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// will be completely unpopulated.
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bool DuplicateFrom(const ScopedProcessInformation& other);
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// Transfers ownership of the held PROCESS_INFORMATION, if any, away from this
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// instance.
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PROCESS_INFORMATION Take();
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// Transfers ownership of the held process handle, if any, away from this
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// instance. Note that the related process_id will also be cleared.
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HANDLE TakeProcessHandle();
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// Transfers ownership of the held thread handle, if any, away from this
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// instance. Note that the related thread_id will also be cleared.
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HANDLE TakeThreadHandle();
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// Returns the held process handle, if any, while retaining ownership.
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HANDLE process_handle() const {
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return process_handle_.Get();
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}
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// Returns the held thread handle, if any, while retaining ownership.
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HANDLE thread_handle() const {
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return thread_handle_.Get();
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}
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// Returns the held process id, if any.
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DWORD process_id() const {
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return process_id_;
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}
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// Returns the held thread id, if any.
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DWORD thread_id() const {
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return thread_id_;
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}
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private:
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ScopedHandle process_handle_;
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ScopedHandle thread_handle_;
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DWORD process_id_;
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DWORD thread_id_;
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DISALLOW_COPY_AND_ASSIGN(ScopedProcessInformation);
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};
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} // namespace win
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} // namespace base
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#endif // BASE_WIN_SCOPED_PROCESS_INFORMATION_H_
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