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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 #include "base/memory/shared_memory.h" | 5 #include "base/memory/shared_memory.h" |
6 | 6 |
7 #include <errno.h> | 7 #include <errno.h> |
8 #include <fcntl.h> | 8 #include <fcntl.h> |
9 #include <stddef.h> | 9 #include <stddef.h> |
10 #include <sys/mman.h> | 10 #include <sys/mman.h> |
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353 *path = temp_dir.AppendASCII(name_base + ".shmem." + mem_name); | 353 *path = temp_dir.AppendASCII(name_base + ".shmem." + mem_name); |
354 return true; | 354 return true; |
355 } | 355 } |
356 #endif // !defined(OS_ANDROID) | 356 #endif // !defined(OS_ANDROID) |
357 | 357 |
358 SharedMemoryHandle SharedMemory::GetReadOnlyHandle() { | 358 SharedMemoryHandle SharedMemory::GetReadOnlyHandle() { |
359 CHECK(readonly_shm_.IsValid()); | 359 CHECK(readonly_shm_.IsValid()); |
360 return readonly_shm_.Duplicate(); | 360 return readonly_shm_.Duplicate(); |
361 } | 361 } |
362 | 362 |
363 bool SharedMemory::ShareToProcessCommon(ProcessHandle process, | |
364 SharedMemoryHandle* new_handle) { | |
365 *new_handle = shm_.Duplicate(); | |
366 return new_handle->IsValid(); | |
367 } | |
368 | |
369 bool SharedMemory::GetUniqueId(SharedMemory::UniqueId* id) const { | 363 bool SharedMemory::GetUniqueId(SharedMemory::UniqueId* id) const { |
370 // This function is called just after mmap. fstat is a system call that might | 364 // This function is called just after mmap. fstat is a system call that might |
371 // cause I/O. It's safe to call fstat here because mmap for shared memory is | 365 // cause I/O. It's safe to call fstat here because mmap for shared memory is |
372 // called in two cases: | 366 // called in two cases: |
373 // 1) To handle file-mapped memory | 367 // 1) To handle file-mapped memory |
374 // 2) To handle annonymous shared memory | 368 // 2) To handle annonymous shared memory |
375 // In 1), I/O is already permitted. In 2), the backend is on page cache and | 369 // In 1), I/O is already permitted. In 2), the backend is on page cache and |
376 // fstat doesn't cause I/O access to the disk. See the discussion at | 370 // fstat doesn't cause I/O access to the disk. See the discussion at |
377 // crbug.com/604726#c41. | 371 // crbug.com/604726#c41. |
378 base::ThreadRestrictions::ScopedAllowIO allow_io; | 372 base::ThreadRestrictions::ScopedAllowIO allow_io; |
379 struct stat file_stat; | 373 struct stat file_stat; |
380 if (HANDLE_EINTR( | 374 if (HANDLE_EINTR( |
381 ::fstat(static_cast<int>(handle().GetHandle()), &file_stat)) != 0) | 375 ::fstat(static_cast<int>(handle().GetHandle()), &file_stat)) != 0) |
382 return false; | 376 return false; |
383 id->first = file_stat.st_dev; | 377 id->first = file_stat.st_dev; |
384 id->second = file_stat.st_ino; | 378 id->second = file_stat.st_ino; |
385 return true; | 379 return true; |
386 } | 380 } |
387 | 381 |
388 } // namespace base | 382 } // namespace base |
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