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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef BASE_WIN_SCOPED_PROCESS_INFORMATION_H_ | 5 #ifndef BASE_WIN_SCOPED_PROCESS_INFORMATION_H_ |
| 6 #define BASE_WIN_SCOPED_PROCESS_INFORMATION_H_ | 6 #define BASE_WIN_SCOPED_PROCESS_INFORMATION_H_ |
| 7 | 7 |
| 8 #include <windows.h> | 8 #include <windows.h> |
| 9 | 9 |
| 10 #include "base/basictypes.h" | 10 #include "base/basictypes.h" |
| 11 #include "base/base_export.h" | 11 #include "base/base_export.h" |
| 12 #include "base/win/scoped_handle.h" | 12 #include "base/win/scoped_handle.h" |
| 13 | 13 |
| 14 namespace base { | 14 namespace base { |
| 15 namespace win { | 15 namespace win { |
| 16 | 16 |
| 17 // Manages the closing of process and thread handles from PROCESS_INFORMATION | 17 // Manages the closing of process and thread handles from PROCESS_INFORMATION |
| 18 // structures. Allows clients to take ownership of either handle independently. | 18 // structures. Allows clients to take ownership of either handle independently. |
| 19 class BASE_EXPORT ScopedProcessInformation { | 19 class BASE_EXPORT ScopedProcessInformation { |
| 20 public: | 20 public: |
| 21 // Helper object to contain the effect of Receive() to the funtion that needs | |
| 22 // a pointer. | |
| 23 class Receiver { | |
| 24 public: | |
| 25 explicit Receiver(ScopedProcessInformation* owner) | |
| 26 : info_(), | |
| 27 owner_(owner) {} | |
| 28 ~Receiver() { owner_->Set(info_); } | |
| 29 | |
| 30 operator PROCESS_INFORMATION*() { return &info_; } | |
| 31 | |
| 32 private: | |
| 33 PROCESS_INFORMATION info_; | |
| 34 ScopedProcessInformation* owner_; | |
| 35 }; | |
| 36 | |
| 37 ScopedProcessInformation(); | 21 ScopedProcessInformation(); |
| 22 explicit ScopedProcessInformation(const PROCESS_INFORMATION& process_info); |
| 38 ~ScopedProcessInformation(); | 23 ~ScopedProcessInformation(); |
| 39 | 24 |
| 40 // Returns an object that may be passed to API calls such as CreateProcess. | |
| 41 // DCHECKs that the object is not currently holding any handles. | |
| 42 // HANDLEs stored in the returned PROCESS_INFORMATION will be owned by this | |
| 43 // instance. | |
| 44 // The intended use case is something like this: | |
| 45 // if (::CreateProcess(..., startup_info, scoped_proces_info.Receive())) | |
| 46 Receiver Receive(); | |
| 47 | |
| 48 // Returns true iff this instance is holding a thread and/or process handle. | 25 // Returns true iff this instance is holding a thread and/or process handle. |
| 49 bool IsValid() const; | 26 bool IsValid() const; |
| 50 | 27 |
| 51 // Closes the held thread and process handles, if any. | 28 // Closes the held thread and process handles, if any. |
| 52 void Close(); | 29 void Close(); |
| 53 | 30 |
| 54 // Populates this instance with the provided |process_info|. | 31 // Populates this instance with the provided |process_info|. |
| 55 void Set(const PROCESS_INFORMATION& process_info); | 32 void Set(const PROCESS_INFORMATION& process_info); |
| 56 | 33 |
| 57 // Populates this instance with duplicate handles and the thread/process IDs | 34 // Populates this instance with duplicate handles and the thread/process IDs |
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| 97 DWORD process_id_; | 74 DWORD process_id_; |
| 98 DWORD thread_id_; | 75 DWORD thread_id_; |
| 99 | 76 |
| 100 DISALLOW_COPY_AND_ASSIGN(ScopedProcessInformation); | 77 DISALLOW_COPY_AND_ASSIGN(ScopedProcessInformation); |
| 101 }; | 78 }; |
| 102 | 79 |
| 103 } // namespace win | 80 } // namespace win |
| 104 } // namespace base | 81 } // namespace base |
| 105 | 82 |
| 106 #endif // BASE_WIN_SCOPED_PROCESS_INFORMATION_H_ | 83 #endif // BASE_WIN_SCOPED_PROCESS_INFORMATION_H_ |
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