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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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| 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. For POSIX handles, CHECK-fails if the region | 210 // ownership of the handle. For POSIX handles, CHECK-fails if the region |
| 211 // wasn't Created or Opened with share_read_only=true, which is required to | 211 // wasn't Created or Opened with share_read_only=true, which is required to |
| 212 // make the handle read-only. When the handle is passed to the IPC subsystem, | 212 // make the handle read-only. When the handle is passed to the IPC subsystem, |
| 213 // that takes ownership of the handle. As such, it's not valid to pass the | 213 // that takes ownership of the handle. As such, it's not valid to pass the |
| 214 // sample handle to the IPC subsystem twice. Returns an invalid handle on | 214 // sample handle to the IPC subsystem twice. Returns an invalid handle on |
| 215 // failure. | 215 // failure. |
| 216 SharedMemoryHandle GetReadOnlyHandle(); | 216 SharedMemoryHandle GetReadOnlyHandle(); |
| 217 | 217 |
| 218 // Shares the shared memory to another process. Attempts | |
| 219 // to create a platform-specific new_handle which can be | |
| 220 // used in a remote process to access the shared memory | |
| 221 // file. new_handle is an output parameter to receive | |
| 222 // the handle for use in the remote process. | |
| 223 // Returns true on success, false otherwise. | |
| 224 bool ShareToProcess(ProcessHandle process, | |
| 225 SharedMemoryHandle* new_handle) { | |
| 226 return ShareToProcessCommon(process, new_handle); | |
| 227 } | |
| 228 | |
| 229 #if defined(OS_POSIX) && (!defined(OS_MACOSX) || defined(OS_IOS)) && \ | 218 #if defined(OS_POSIX) && (!defined(OS_MACOSX) || defined(OS_IOS)) && \ |
| 230 !defined(OS_NACL) | 219 !defined(OS_NACL) |
| 231 using UniqueId = std::pair<dev_t, ino_t>; | 220 using UniqueId = std::pair<dev_t, ino_t>; |
| 232 | 221 |
| 233 struct UniqueIdHash { | 222 struct UniqueIdHash { |
| 234 size_t operator()(const UniqueId& id) const { | 223 size_t operator()(const UniqueId& id) const { |
| 235 return HashInts(id.first, id.second); | 224 return HashInts(id.first, id.second); |
| 236 } | 225 } |
| 237 }; | 226 }; |
| 238 | 227 |
| 239 // Returns a unique ID for this shared memory's handle. Note this function may | 228 // Returns a unique ID for this shared memory's handle. Note this function may |
| 240 // access file system and be slow. | 229 // access file system and be slow. |
| 241 bool GetUniqueId(UniqueId* id) const; | 230 bool GetUniqueId(UniqueId* id) const; |
| 242 #endif | 231 #endif |
| 243 | 232 |
| 244 private: | 233 private: |
| 245 #if defined(OS_POSIX) && !defined(OS_NACL) && !defined(OS_ANDROID) && \ | 234 #if defined(OS_POSIX) && !defined(OS_NACL) && !defined(OS_ANDROID) && \ |
| 246 (!defined(OS_MACOSX) || defined(OS_IOS)) | 235 (!defined(OS_MACOSX) || defined(OS_IOS)) |
| 247 bool FilePathForMemoryName(const std::string& mem_name, FilePath* path); | 236 bool FilePathForMemoryName(const std::string& mem_name, FilePath* path); |
| 248 #endif | 237 #endif |
| 249 | 238 |
| 250 #if defined(OS_MACOSX) | |
| 251 bool Share(SharedMemoryHandle* new_handle); | |
| 252 #endif | |
| 253 | |
| 254 bool ShareToProcessCommon(ProcessHandle process, | |
| 255 SharedMemoryHandle* new_handle); | |
| 256 | |
| 257 #if defined(OS_WIN) | 239 #if defined(OS_WIN) |
| 258 // If true indicates this came from an external source so needs extra checks | 240 // If true indicates this came from an external source so needs extra checks |
| 259 // before being mapped. | 241 // before being mapped. |
| 260 bool external_section_; | 242 bool external_section_; |
| 261 std::wstring name_; | 243 std::wstring name_; |
| 262 win::ScopedHandle mapped_file_; | 244 win::ScopedHandle mapped_file_; |
| 263 #else | 245 #else |
| 264 // The OS primitive that backs the shared memory region. | 246 // The OS primitive that backs the shared memory region. |
| 265 SharedMemoryHandle shm_; | 247 SharedMemoryHandle shm_; |
| 266 | 248 |
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| 279 void* memory_; | 261 void* memory_; |
| 280 bool read_only_; | 262 bool read_only_; |
| 281 size_t requested_size_; | 263 size_t requested_size_; |
| 282 | 264 |
| 283 DISALLOW_COPY_AND_ASSIGN(SharedMemory); | 265 DISALLOW_COPY_AND_ASSIGN(SharedMemory); |
| 284 }; | 266 }; |
| 285 | 267 |
| 286 } // namespace base | 268 } // namespace base |
| 287 | 269 |
| 288 #endif // BASE_MEMORY_SHARED_MEMORY_H_ | 270 #endif // BASE_MEMORY_SHARED_MEMORY_H_ |
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