scoped_open_process.h 1.17 KB
Newer Older
gejun's avatar
gejun committed
1 2 3 4 5 6 7
// 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_MEMORY_SCOPED_OPEN_PROCESS_H_
#define BASE_MEMORY_SCOPED_OPEN_PROCESS_H_

8
#include "butil/process/process_handle.h"
gejun's avatar
gejun committed
9

10
namespace butil {
gejun's avatar
gejun committed
11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45

// A class that opens a process from its process id and closes it when the
// instance goes out of scope.
class ScopedOpenProcess {
 public:
  ScopedOpenProcess() : handle_(kNullProcessHandle) {
  }

  // Automatically close the process.
  ~ScopedOpenProcess() {
    Close();
  }

  // Open a new process by pid. Closes any previously opened process (even if
  // opening the new one fails).
  bool Open(ProcessId pid) {
    Close();
    return OpenProcessHandle(pid, &handle_);
  }

  // Close the previously opened process.
  void Close() {
    if (handle_ == kNullProcessHandle)
      return;

    CloseProcessHandle(handle_);
    handle_ = kNullProcessHandle;
  }

  ProcessHandle handle() const { return handle_; }

 private:
  ProcessHandle handle_;
  DISALLOW_COPY_AND_ASSIGN(ScopedOpenProcess);
};
46
}  // namespace butil
gejun's avatar
gejun committed
47 48

#endif  // BASE_MEMORY_SCOPED_OPEN_PROCESS_H_