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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_MEMORY_SHARED_MEMORY_H_ | 5 #ifndef BASE_MEMORY_SHARED_MEMORY_H_ |
6 #define BASE_MEMORY_SHARED_MEMORY_H_ | 6 #define BASE_MEMORY_SHARED_MEMORY_H_ |
7 | 7 |
8 #include <stddef.h> | 8 #include <stddef.h> |
9 | 9 |
10 #include <string> | 10 #include <string> |
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206 // It is safe to call Close repeatedly. | 206 // It is safe to call Close repeatedly. |
207 void Close(); | 207 void Close(); |
208 | 208 |
209 // Returns a read-only handle to this shared memory region. The caller takes | 209 // Returns a read-only handle to this shared memory region. The caller takes |
210 // ownership of the handle. CHECK-fails if the region wasn't Created or | 210 // ownership of the handle. CHECK-fails if the region wasn't Created or |
211 // Opened with share_read_only=true. When the handle is passed to the IPC | 211 // Opened with share_read_only=true. When the handle is passed to the IPC |
212 // subsystem, that takes ownership of the handle. As such, it's not valid to | 212 // subsystem, that takes ownership of the handle. As such, it's not valid to |
213 // pass the sample handle to the IPC subsystem twice. | 213 // pass the sample handle to the IPC subsystem twice. |
214 SharedMemoryHandle GetReadOnlyHandle(); | 214 SharedMemoryHandle GetReadOnlyHandle(); |
215 | 215 |
216 // Shares the shared memory to another process. Attempts | |
217 // to create a platform-specific new_handle which can be | |
218 // used in a remote process to access the shared memory | |
219 // file. new_handle is an output parameter to receive | |
220 // the handle for use in the remote process. | |
221 // Returns true on success, false otherwise. | |
222 bool ShareToProcess(ProcessHandle process, | |
223 SharedMemoryHandle* new_handle) { | |
224 return ShareToProcessCommon(process, new_handle); | |
225 } | |
226 | |
227 #if defined(OS_POSIX) && (!defined(OS_MACOSX) || defined(OS_IOS)) && \ | 216 #if defined(OS_POSIX) && (!defined(OS_MACOSX) || defined(OS_IOS)) && \ |
228 !defined(OS_NACL) | 217 !defined(OS_NACL) |
229 using UniqueId = std::pair<dev_t, ino_t>; | 218 using UniqueId = std::pair<dev_t, ino_t>; |
230 | 219 |
231 struct UniqueIdHash { | 220 struct UniqueIdHash { |
232 size_t operator()(const UniqueId& id) const { | 221 size_t operator()(const UniqueId& id) const { |
233 return HashInts(id.first, id.second); | 222 return HashInts(id.first, id.second); |
234 } | 223 } |
235 }; | 224 }; |
236 | 225 |
237 // Returns a unique ID for this shared memory's handle. Note this function may | 226 // Returns a unique ID for this shared memory's handle. Note this function may |
238 // access file system and be slow. | 227 // access file system and be slow. |
239 bool GetUniqueId(UniqueId* id) const; | 228 bool GetUniqueId(UniqueId* id) const; |
240 #endif | 229 #endif |
241 | 230 |
242 private: | 231 private: |
243 #if defined(OS_POSIX) && !defined(OS_NACL) && !defined(OS_ANDROID) && \ | 232 #if defined(OS_POSIX) && !defined(OS_NACL) && !defined(OS_ANDROID) && \ |
244 (!defined(OS_MACOSX) || defined(OS_IOS)) | 233 (!defined(OS_MACOSX) || defined(OS_IOS)) |
245 bool FilePathForMemoryName(const std::string& mem_name, FilePath* path); | 234 bool FilePathForMemoryName(const std::string& mem_name, FilePath* path); |
246 #endif | 235 #endif |
247 | 236 |
248 #if defined(OS_MACOSX) | |
249 bool Share(SharedMemoryHandle* new_handle); | |
250 #endif | |
251 | |
252 bool ShareToProcessCommon(ProcessHandle process, | |
253 SharedMemoryHandle* new_handle); | |
254 | |
255 #if defined(OS_WIN) | 237 #if defined(OS_WIN) |
256 // If true indicates this came from an external source so needs extra checks | 238 // If true indicates this came from an external source so needs extra checks |
257 // before being mapped. | 239 // before being mapped. |
258 bool external_section_; | 240 bool external_section_; |
259 std::wstring name_; | 241 std::wstring name_; |
260 win::ScopedHandle mapped_file_; | 242 win::ScopedHandle mapped_file_; |
261 #else | 243 #else |
262 // The OS primitive that backs the shared memory region. | 244 // The OS primitive that backs the shared memory region. |
263 SharedMemoryHandle shm_; | 245 SharedMemoryHandle shm_; |
264 | 246 |
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277 void* memory_; | 259 void* memory_; |
278 bool read_only_; | 260 bool read_only_; |
279 size_t requested_size_; | 261 size_t requested_size_; |
280 | 262 |
281 DISALLOW_COPY_AND_ASSIGN(SharedMemory); | 263 DISALLOW_COPY_AND_ASSIGN(SharedMemory); |
282 }; | 264 }; |
283 | 265 |
284 } // namespace base | 266 } // namespace base |
285 | 267 |
286 #endif // BASE_MEMORY_SHARED_MEMORY_H_ | 268 #endif // BASE_MEMORY_SHARED_MEMORY_H_ |
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