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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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210 | 210 |
211 // Returns a read-only handle to this shared memory region. The caller takes | 211 // Returns a read-only handle to this shared memory region. The caller takes |
212 // ownership of the handle. For POSIX handles, CHECK-fails if the region | 212 // ownership of the handle. For POSIX handles, CHECK-fails if the region |
213 // wasn't Created or Opened with share_read_only=true, which is required to | 213 // wasn't Created or Opened with share_read_only=true, which is required to |
214 // make the handle read-only. When the handle is passed to the IPC subsystem, | 214 // make the handle read-only. When the handle is passed to the IPC subsystem, |
215 // that takes ownership of the handle. As such, it's not valid to pass the | 215 // that takes ownership of the handle. As such, it's not valid to pass the |
216 // sample handle to the IPC subsystem twice. Returns an invalid handle on | 216 // sample handle to the IPC subsystem twice. Returns an invalid handle on |
217 // failure. | 217 // failure. |
218 SharedMemoryHandle GetReadOnlyHandle(); | 218 SharedMemoryHandle GetReadOnlyHandle(); |
219 | 219 |
220 #if defined(OS_POSIX) && (!defined(OS_MACOSX) || defined(OS_IOS)) && \ | 220 // Uniques identifies the shared memory region that the underlying OS resource |
221 !defined(OS_NACL) | 221 // points to. This just returns its handler's GUID. |
222 using UniqueId = std::pair<dev_t, ino_t>; | 222 base::UnguessableToken GetGUID() const; |
223 | |
224 struct UniqueIdHash { | |
225 size_t operator()(const UniqueId& id) const { | |
226 return HashInts(id.first, id.second); | |
227 } | |
228 }; | |
229 | |
230 // Returns a unique ID for this shared memory's handle. Note this function may | |
231 // access file system and be slow. | |
232 bool GetUniqueId(UniqueId* id) const; | |
233 #endif | |
234 | 223 |
235 private: | 224 private: |
236 #if defined(OS_POSIX) && !defined(OS_NACL) && !defined(OS_ANDROID) && \ | 225 #if defined(OS_POSIX) && !defined(OS_NACL) && !defined(OS_ANDROID) && \ |
237 (!defined(OS_MACOSX) || defined(OS_IOS)) | 226 (!defined(OS_MACOSX) || defined(OS_IOS)) |
238 bool FilePathForMemoryName(const std::string& mem_name, FilePath* path); | 227 bool FilePathForMemoryName(const std::string& mem_name, FilePath* path); |
239 #endif | 228 #endif |
240 | 229 |
241 #if defined(OS_WIN) | 230 #if defined(OS_WIN) |
242 // If true indicates this came from an external source so needs extra checks | 231 // If true indicates this came from an external source so needs extra checks |
243 // before being mapped. | 232 // before being mapped. |
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263 void* memory_; | 252 void* memory_; |
264 bool read_only_; | 253 bool read_only_; |
265 size_t requested_size_; | 254 size_t requested_size_; |
266 | 255 |
267 DISALLOW_COPY_AND_ASSIGN(SharedMemory); | 256 DISALLOW_COPY_AND_ASSIGN(SharedMemory); |
268 }; | 257 }; |
269 | 258 |
270 } // namespace base | 259 } // namespace base |
271 | 260 |
272 #endif // BASE_MEMORY_SHARED_MEMORY_H_ | 261 #endif // BASE_MEMORY_SHARED_MEMORY_H_ |
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