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| 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2010 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/shared_memory.h" | 5 #include "base/shared_memory.h" |
| 6 | 6 |
| 7 #include <errno.h> | 7 #include <errno.h> |
| 8 #include <fcntl.h> | 8 #include <fcntl.h> |
| 9 #include <sys/mman.h> | 9 #include <sys/mman.h> |
| 10 #include <sys/stat.h> | 10 #include <sys/stat.h> |
| 11 #include <unistd.h> | 11 #include <unistd.h> |
| 12 | 12 |
| 13 #include "base/file_util.h" | 13 #include "base/file_util.h" |
| 14 #include "base/logging.h" | 14 #include "base/logging.h" |
| 15 #include "base/platform_thread.h" | 15 #include "base/platform_thread.h" |
| 16 #include "base/safe_strerror_posix.h" | 16 #include "base/safe_strerror_posix.h" |
| 17 #include "base/string_util.h" | 17 #include "base/utf_string_conversions.h" |
| 18 | 18 |
| 19 namespace base { | 19 namespace base { |
| 20 | 20 |
| 21 namespace { | 21 namespace { |
| 22 // Paranoia. Semaphores and shared memory segments should live in different | 22 // Paranoia. Semaphores and shared memory segments should live in different |
| 23 // namespaces, but who knows what's out there. | 23 // namespaces, but who knows what's out there. |
| 24 const char kSemaphoreSuffix[] = "-sem"; | 24 const char kSemaphoreSuffix[] = "-sem"; |
| 25 } | 25 } |
| 26 | 26 |
| 27 SharedMemory::SharedMemory() | 27 SharedMemory::SharedMemory() |
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| 126 // mem_name will be used for a filename; make sure it doesn't | 126 // mem_name will be used for a filename; make sure it doesn't |
| 127 // contain anything which will confuse us. | 127 // contain anything which will confuse us. |
| 128 DCHECK(memname.find_first_of(L"/") == std::string::npos); | 128 DCHECK(memname.find_first_of(L"/") == std::string::npos); |
| 129 DCHECK(memname.find_first_of(L"\0") == std::string::npos); | 129 DCHECK(memname.find_first_of(L"\0") == std::string::npos); |
| 130 | 130 |
| 131 FilePath temp_dir; | 131 FilePath temp_dir; |
| 132 if (file_util::GetShmemTempDir(&temp_dir) == false) | 132 if (file_util::GetShmemTempDir(&temp_dir) == false) |
| 133 return false; | 133 return false; |
| 134 | 134 |
| 135 *path = temp_dir.AppendASCII("com.google.chrome.shmem." + | 135 *path = temp_dir.AppendASCII("com.google.chrome.shmem." + |
| 136 WideToASCII(memname)); | 136 WideToUTF8(memname)); |
| 137 return true; | 137 return true; |
| 138 } | 138 } |
| 139 | 139 |
| 140 // Chromium mostly only use the unique/private shmem as specified by | 140 // Chromium mostly only use the unique/private shmem as specified by |
| 141 // "name == L"". The exception is in the StatsTable. | 141 // "name == L"". The exception is in the StatsTable. |
| 142 // TODO(jrg): there is no way to "clean up" all unused named shmem if | 142 // TODO(jrg): there is no way to "clean up" all unused named shmem if |
| 143 // we restart from a crash. (That isn't a new problem, but it is a problem.) | 143 // we restart from a crash. (That isn't a new problem, but it is a problem.) |
| 144 // In case we want to delete it later, it may be useful to save the value | 144 // In case we want to delete it later, it may be useful to save the value |
| 145 // of mem_filename after FilePathForMemoryName(). | 145 // of mem_filename after FilePathForMemoryName(). |
| 146 bool SharedMemory::CreateOrOpen(const std::wstring &name, | 146 bool SharedMemory::CreateOrOpen(const std::wstring &name, |
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| 309 | 309 |
| 310 void SharedMemory::Unlock() { | 310 void SharedMemory::Unlock() { |
| 311 LockOrUnlockCommon(F_ULOCK); | 311 LockOrUnlockCommon(F_ULOCK); |
| 312 } | 312 } |
| 313 | 313 |
| 314 SharedMemoryHandle SharedMemory::handle() const { | 314 SharedMemoryHandle SharedMemory::handle() const { |
| 315 return FileDescriptor(mapped_file_, false); | 315 return FileDescriptor(mapped_file_, false); |
| 316 } | 316 } |
| 317 | 317 |
| 318 } // namespace base | 318 } // namespace base |
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