1 // Copyright (c) 2012 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_WIN_SCOPED_PROCESS_INFORMATION_H_ 6 #define BASE_WIN_SCOPED_PROCESS_INFORMATION_H_ 7 8 #include <windows.h> 9 10 #include "base/macros.h" 11 #include "base/win/scoped_handle.h" 12 13 namespace base { 14 namespace win { 15 16 // Manages the closing of process and thread handles from PROCESS_INFORMATION 17 // structures. Allows clients to take ownership of either handle independently. 18 class ScopedProcessInformation { 19 public: 20 ScopedProcessInformation(); 21 explicit ScopedProcessInformation(const PROCESS_INFORMATION& process_info); 22 ~ScopedProcessInformation(); 23 24 // Returns true iff this instance is holding a thread and/or process handle. 25 bool IsValid() const; 26 27 // Closes the held thread and process handles, if any. 28 void Close(); 29 30 // Populates this instance with the provided |process_info|. 31 void Set(const PROCESS_INFORMATION& process_info); 32 33 // Populates this instance with duplicate handles and the thread/process IDs 34 // from |other|. Returns false in case of failure, in which case this instance 35 // will be completely unpopulated. 36 bool DuplicateFrom(const ScopedProcessInformation& other); 37 38 // Transfers ownership of the held PROCESS_INFORMATION, if any, away from this 39 // instance. 40 PROCESS_INFORMATION Take(); 41 42 // Transfers ownership of the held process handle, if any, away from this 43 // instance. Note that the related process_id will also be cleared. 44 HANDLE TakeProcessHandle(); 45 46 // Transfers ownership of the held thread handle, if any, away from this 47 // instance. Note that the related thread_id will also be cleared. 48 HANDLE TakeThreadHandle(); 49 50 // Returns the held process handle, if any, while retaining ownership. process_handle()51 HANDLE process_handle() const { return process_handle_.Get(); } 52 53 // Returns the held thread handle, if any, while retaining ownership. thread_handle()54 HANDLE thread_handle() const { return thread_handle_.Get(); } 55 56 // Returns the held process id, if any. process_id()57 DWORD process_id() const { return process_id_; } 58 59 // Returns the held thread id, if any. thread_id()60 DWORD thread_id() const { return thread_id_; } 61 62 private: 63 ScopedHandle process_handle_; 64 ScopedHandle thread_handle_; 65 DWORD process_id_; 66 DWORD thread_id_; 67 68 DISALLOW_COPY_AND_ASSIGN(ScopedProcessInformation); 69 }; 70 71 } // namespace win 72 } // namespace base 73 74 #endif // BASE_WIN_SCOPED_PROCESS_INFORMATION_H_ 75