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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 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/threading/platform_thread.h" | 15 #include "base/threading/platform_thread.h" |
16 #include "base/safe_strerror_posix.h" | 16 #include "base/safe_strerror_posix.h" |
17 #include "base/threading/thread_restrictions.h" | 17 #include "base/threading/thread_restrictions.h" |
18 #include "base/utf_string_conversions.h" | 18 #include "base/utf_string_conversions.h" |
19 | 19 |
20 #if defined(OS_MACOSX) | 20 #if defined(OS_MACOSX) |
21 #include "base/mac/foundation_util.h" | 21 #include "base/mac/foundation_util.h" |
22 #endif // OS_MACOSX | 22 #endif // OS_MACOSX |
23 | 23 |
24 namespace base { | 24 namespace base { |
25 | 25 |
26 namespace { | 26 namespace { |
27 | |
27 // Paranoia. Semaphores and shared memory segments should live in different | 28 // Paranoia. Semaphores and shared memory segments should live in different |
28 // namespaces, but who knows what's out there. | 29 // namespaces, but who knows what's out there. |
29 const char kSemaphoreSuffix[] = "-sem"; | 30 const char kSemaphoreSuffix[] = "-sem"; |
31 | |
32 #if defined(OS_ANDROID) | |
33 // The lockf() function is not available on Android; we translate to flock(). | |
34 #define F_LOCK LOCK_EX | |
35 #define F_ULOCK LOCK_UN | |
36 inline int lockf(int fd, int cmd, off_t ignored_len) { | |
37 return flock(fd, cmd); | |
30 } | 38 } |
39 #endif | |
40 | |
41 } // namespace. | |
31 | 42 |
32 SharedMemory::SharedMemory() | 43 SharedMemory::SharedMemory() |
33 : mapped_file_(-1), | 44 : mapped_file_(-1), |
34 mapped_size_(0), | 45 mapped_size_(0), |
35 inode_(0), | 46 inode_(0), |
36 memory_(NULL), | 47 memory_(NULL), |
37 read_only_(false), | 48 read_only_(false), |
38 created_size_(0) { | 49 created_size_(0) { |
39 } | 50 } |
40 | 51 |
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88 } | 99 } |
89 | 100 |
90 bool SharedMemory::CreateAndMapAnonymous(uint32 size) { | 101 bool SharedMemory::CreateAndMapAnonymous(uint32 size) { |
91 return CreateAnonymous(size) && Map(size); | 102 return CreateAnonymous(size) && Map(size); |
92 } | 103 } |
93 | 104 |
94 bool SharedMemory::CreateAnonymous(uint32 size) { | 105 bool SharedMemory::CreateAnonymous(uint32 size) { |
95 return CreateNamed("", false, size); | 106 return CreateNamed("", false, size); |
96 } | 107 } |
97 | 108 |
109 #if !defined(OS_ANDROID) | |
98 // Chromium mostly only uses the unique/private shmem as specified by | 110 // Chromium mostly only uses the unique/private shmem as specified by |
99 // "name == L"". The exception is in the StatsTable. | 111 // "name == L"". The exception is in the StatsTable. |
100 // TODO(jrg): there is no way to "clean up" all unused named shmem if | 112 // TODO(jrg): there is no way to "clean up" all unused named shmem if |
101 // we restart from a crash. (That isn't a new problem, but it is a problem.) | 113 // we restart from a crash. (That isn't a new problem, but it is a problem.) |
102 // In case we want to delete it later, it may be useful to save the value | 114 // In case we want to delete it later, it may be useful to save the value |
103 // of mem_filename after FilePathForMemoryName(). | 115 // of mem_filename after FilePathForMemoryName(). |
104 bool SharedMemory::CreateNamed(const std::string& name, | 116 bool SharedMemory::CreateNamed(const std::string& name, |
105 bool open_existing, uint32 size) { | 117 bool open_existing, uint32 size) { |
106 DCHECK_EQ(-1, mapped_file_); | 118 DCHECK_EQ(-1, mapped_file_); |
107 if (size == 0) return false; | 119 if (size == 0) return false; |
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170 return false; | 182 return false; |
171 } | 183 } |
172 | 184 |
173 return PrepareMapFile(fp); | 185 return PrepareMapFile(fp); |
174 } | 186 } |
175 | 187 |
176 // Our current implementation of shmem is with mmap()ing of files. | 188 // Our current implementation of shmem is with mmap()ing of files. |
177 // These files need to be deleted explicitly. | 189 // These files need to be deleted explicitly. |
178 // In practice this call is only needed for unit tests. | 190 // In practice this call is only needed for unit tests. |
179 bool SharedMemory::Delete(const std::string& name) { | 191 bool SharedMemory::Delete(const std::string& name) { |
192 | |
joth
2011/06/19 12:48:05
nit: remove \n
michaelbai
2011/06/20 22:50:36
Done.
| |
180 FilePath path; | 193 FilePath path; |
181 if (!FilePathForMemoryName(name, &path)) | 194 if (!FilePathForMemoryName(name, &path)) |
182 return false; | 195 return false; |
183 | 196 |
184 if (file_util::PathExists(path)) { | 197 if (file_util::PathExists(path)) { |
185 return file_util::Delete(path, false); | 198 return file_util::Delete(path, false); |
186 } | 199 } |
187 | 200 |
188 // Doesn't exist, so success. | 201 // Doesn't exist, so success. |
189 return true; | 202 return true; |
190 } | 203 } |
191 | 204 |
192 bool SharedMemory::Open(const std::string& name, bool read_only) { | 205 bool SharedMemory::Open(const std::string& name, bool read_only) { |
193 FilePath path; | 206 FilePath path; |
194 if (!FilePathForMemoryName(name, &path)) | 207 if (!FilePathForMemoryName(name, &path)) |
195 return false; | 208 return false; |
196 | 209 |
197 read_only_ = read_only; | 210 read_only_ = read_only; |
198 | 211 |
199 const char *mode = read_only ? "r" : "r+"; | 212 const char *mode = read_only ? "r" : "r+"; |
200 FILE *fp = file_util::OpenFile(path, mode); | 213 FILE *fp = file_util::OpenFile(path, mode); |
201 return PrepareMapFile(fp); | 214 return PrepareMapFile(fp); |
202 } | 215 } |
203 | 216 |
217 #endif // !defined(OS_ANDROID) | |
218 | |
204 bool SharedMemory::Map(uint32 bytes) { | 219 bool SharedMemory::Map(uint32 bytes) { |
205 if (mapped_file_ == -1) | 220 if (mapped_file_ == -1) |
206 return false; | 221 return false; |
207 | 222 |
223 #if defined(OS_ANDROID) | |
224 int ashmem_bytes = GetAshmenSizeRegion(); | |
225 DCHECK_GE((uint32)ashmem_bytes, bytes); | |
joth
2011/06/19 12:48:05
nit: static_cast<uint32>(ashmem_bytes) although th
michaelbai
2011/06/20 22:50:36
Done.
| |
226 if (bytes == 0) { | |
227 // The caller wants to determine the map region size from ashmem. | |
228 bytes = ashmem_bytes; | |
229 // TODO(port): we set the created size here so that it is available in | |
230 // transport_dib_android.cc. We should use | |
231 // SharedMemory::GetAshmenSizeRegion() in TransportDIB::Map(). | |
232 created_size_ = bytes; | |
233 } | |
234 #endif | |
joth
2011/06/19 12:48:05
seems unfortunate to commit this hack when the cod
| |
235 | |
208 memory_ = mmap(NULL, bytes, PROT_READ | (read_only_ ? 0 : PROT_WRITE), | 236 memory_ = mmap(NULL, bytes, PROT_READ | (read_only_ ? 0 : PROT_WRITE), |
209 MAP_SHARED, mapped_file_, 0); | 237 MAP_SHARED, mapped_file_, 0); |
210 | 238 |
211 if (memory_) | 239 if (memory_) |
212 mapped_size_ = bytes; | 240 mapped_size_ = bytes; |
213 | 241 |
214 bool mmap_succeeded = (memory_ != (void*)-1); | 242 bool mmap_succeeded = (memory_ != (void*)-1); |
215 DCHECK(mmap_succeeded) << "Call to mmap failed, errno=" << errno; | 243 DCHECK(mmap_succeeded) << "Call to mmap failed, errno=" << errno; |
216 return mmap_succeeded; | 244 return mmap_succeeded; |
217 } | 245 } |
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241 } | 269 } |
242 | 270 |
243 void SharedMemory::Lock() { | 271 void SharedMemory::Lock() { |
244 LockOrUnlockCommon(F_LOCK); | 272 LockOrUnlockCommon(F_LOCK); |
245 } | 273 } |
246 | 274 |
247 void SharedMemory::Unlock() { | 275 void SharedMemory::Unlock() { |
248 LockOrUnlockCommon(F_ULOCK); | 276 LockOrUnlockCommon(F_ULOCK); |
249 } | 277 } |
250 | 278 |
279 #if !defined(OS_ANDROID) | |
251 bool SharedMemory::PrepareMapFile(FILE *fp) { | 280 bool SharedMemory::PrepareMapFile(FILE *fp) { |
252 DCHECK_EQ(-1, mapped_file_); | 281 DCHECK_EQ(-1, mapped_file_); |
253 if (fp == NULL) return false; | 282 if (fp == NULL) return false; |
254 | 283 |
255 // This function theoretically can block on the disk, but realistically | 284 // This function theoretically can block on the disk, but realistically |
256 // the temporary files we create will just go into the buffer cache | 285 // the temporary files we create will just go into the buffer cache |
257 // and be deleted before they ever make it out to disk. | 286 // and be deleted before they ever make it out to disk. |
258 base::ThreadRestrictions::ScopedAllowIO allow_io; | 287 base::ThreadRestrictions::ScopedAllowIO allow_io; |
259 | 288 |
260 file_util::ScopedFILE file_closer(fp); | 289 file_util::ScopedFILE file_closer(fp); |
261 | 290 |
262 mapped_file_ = dup(fileno(fp)); | 291 mapped_file_ = dup(fileno(fp)); |
263 if (mapped_file_ == -1) { | 292 if (mapped_file_ == -1) { |
264 if (errno == EMFILE) { | 293 if (errno == EMFILE) { |
265 LOG(WARNING) << "Shared memory creation failed; out of file descriptors"; | 294 LOG(WARNING) << "Shared memory creation failed; out of file descriptors"; |
266 return false; | 295 return false; |
267 } else { | 296 } else { |
268 NOTREACHED() << "Call to dup failed, errno=" << errno; | 297 NOTREACHED() << "Call to dup failed, errno=" << errno; |
269 } | 298 } |
270 } | 299 } |
271 | 300 |
272 struct stat st; | 301 struct stat st; |
273 if (fstat(mapped_file_, &st)) | 302 if (fstat(mapped_file_, &st)) |
274 NOTREACHED(); | 303 NOTREACHED(); |
275 inode_ = st.st_ino; | 304 inode_ = st.st_ino; |
276 | 305 |
277 return true; | 306 return true; |
278 } | 307 } |
308 #endif | |
279 | 309 |
280 // For the given shmem named |mem_name|, return a filename to mmap() | 310 // For the given shmem named |mem_name|, return a filename to mmap() |
281 // (and possibly create). Modifies |filename|. Return false on | 311 // (and possibly create). Modifies |filename|. Return false on |
282 // error, or true of we are happy. | 312 // error, or true of we are happy. |
283 bool SharedMemory::FilePathForMemoryName(const std::string& mem_name, | 313 bool SharedMemory::FilePathForMemoryName(const std::string& mem_name, |
284 FilePath* path) { | 314 FilePath* path) { |
285 // mem_name will be used for a filename; make sure it doesn't | 315 // mem_name will be used for a filename; make sure it doesn't |
286 // contain anything which will confuse us. | 316 // contain anything which will confuse us. |
287 DCHECK_EQ(std::string::npos, mem_name.find('/')); | 317 DCHECK_EQ(std::string::npos, mem_name.find('/')); |
288 DCHECK_EQ(std::string::npos, mem_name.find('\0')); | 318 DCHECK_EQ(std::string::npos, mem_name.find('\0')); |
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331 new_handle->fd = new_fd; | 361 new_handle->fd = new_fd; |
332 new_handle->auto_close = true; | 362 new_handle->auto_close = true; |
333 | 363 |
334 if (close_self) | 364 if (close_self) |
335 Close(); | 365 Close(); |
336 | 366 |
337 return true; | 367 return true; |
338 } | 368 } |
339 | 369 |
340 } // namespace base | 370 } // namespace base |
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