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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef BASE_MEMORY_SCOPED_OPEN_PROCESS_H_
      6 #define BASE_MEMORY_SCOPED_OPEN_PROCESS_H_
      7 #pragma once
      8 
      9 #include "base/process.h"
     10 #include "base/process_util.h"
     11 
     12 namespace base {
     13 
     14 // A class that opens a process from its process id and closes it when the
     15 // instance goes out of scope.
     16 class ScopedOpenProcess {
     17  public:
     18   ScopedOpenProcess() : handle_(kNullProcessHandle) {
     19   }
     20 
     21   // Automatically close the process.
     22   ~ScopedOpenProcess() {
     23     Close();
     24   }
     25 
     26   // Open a new process by pid. Closes any previously opened process (even if
     27   // opening the new one fails).
     28   bool Open(ProcessId pid) {
     29     Close();
     30     return OpenProcessHandle(pid, &handle_);
     31   }
     32 
     33   // Close the previously opened process.
     34   void Close() {
     35     if (handle_ == kNullProcessHandle)
     36       return;
     37 
     38     CloseProcessHandle(handle_);
     39     handle_ = kNullProcessHandle;
     40   }
     41 
     42   ProcessHandle handle() const { return handle_; }
     43 
     44  private:
     45   ProcessHandle handle_;
     46   DISALLOW_COPY_AND_ASSIGN(ScopedOpenProcess);
     47 };
     48 }  // namespace base
     49 
     50 #endif  // BASE_MEMORY_SCOPED_OPEN_PROCESS_H_
     51