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/basictypes.h" 11 #include "base/base_export.h" 12 #include "base/win/scoped_handle.h" 13 14 namespace base { 15 namespace win { 16 17 // Manages the closing of process and thread handles from PROCESS_INFORMATION 18 // structures. Allows clients to take ownership of either handle independently. 19 class BASE_EXPORT ScopedProcessInformation { 20 public: 21 ScopedProcessInformation(); 22 explicit ScopedProcessInformation(const PROCESS_INFORMATION& process_info); 23 ~ScopedProcessInformation(); 24 25 // Returns true iff this instance is holding a thread and/or process handle. 26 bool IsValid() const; 27 28 // Closes the held thread and process handles, if any. 29 void Close(); 30 31 // Populates this instance with the provided |process_info|. 32 void Set(const PROCESS_INFORMATION& process_info); 33 34 // Populates this instance with duplicate handles and the thread/process IDs 35 // from |other|. Returns false in case of failure, in which case this instance 36 // will be completely unpopulated. 37 bool DuplicateFrom(const ScopedProcessInformation& other); 38 39 // Transfers ownership of the held PROCESS_INFORMATION, if any, away from this 40 // instance. 41 PROCESS_INFORMATION Take(); 42 43 // Transfers ownership of the held process handle, if any, away from this 44 // instance. Note that the related process_id will also be cleared. 45 HANDLE TakeProcessHandle(); 46 47 // Transfers ownership of the held thread handle, if any, away from this 48 // instance. Note that the related thread_id will also be cleared. 49 HANDLE TakeThreadHandle(); 50 51 // Returns the held process handle, if any, while retaining ownership. process_handle()52 HANDLE process_handle() const { 53 return process_handle_.Get(); 54 } 55 56 // Returns the held thread handle, if any, while retaining ownership. thread_handle()57 HANDLE thread_handle() const { 58 return thread_handle_.Get(); 59 } 60 61 // Returns the held process id, if any. process_id()62 DWORD process_id() const { 63 return process_id_; 64 } 65 66 // Returns the held thread id, if any. thread_id()67 DWORD thread_id() const { 68 return thread_id_; 69 } 70 71 private: 72 ScopedHandle process_handle_; 73 ScopedHandle thread_handle_; 74 DWORD process_id_; 75 DWORD thread_id_; 76 77 DISALLOW_COPY_AND_ASSIGN(ScopedProcessInformation); 78 }; 79 80 } // namespace win 81 } // namespace base 82 83 #endif // BASE_WIN_SCOPED_PROCESS_INFORMATION_H_ 84