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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/files/file.h" | 5 #include "base/files/file.h" |
6 | 6 |
7 #include <errno.h> | 7 #include <errno.h> |
8 #include <fcntl.h> | 8 #include <fcntl.h> |
9 #include <sys/stat.h> | 9 #include <sys/stat.h> |
10 #include <unistd.h> | 10 #include <unistd.h> |
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159 } | 159 } |
160 | 160 |
161 // Default implementations of Protect/Unprotect hooks defined as weak symbols | 161 // Default implementations of Protect/Unprotect hooks defined as weak symbols |
162 // where possible. | 162 // where possible. |
163 void ProtectFileDescriptor(int fd) { | 163 void ProtectFileDescriptor(int fd) { |
164 } | 164 } |
165 | 165 |
166 void UnprotectFileDescriptor(int fd) { | 166 void UnprotectFileDescriptor(int fd) { |
167 } | 167 } |
168 | 168 |
169 // NaCl doesn't implement system calls to open files directly. | |
170 #if !defined(OS_NACL) | |
171 // TODO(erikkay): does it make sense to support FLAG_EXCLUSIVE_* here? | |
172 void File::InitializeUnsafe(const FilePath& name, uint32 flags) { | |
173 ThreadRestrictions::AssertIOAllowed(); | |
174 DCHECK(!IsValid()); | |
175 | |
176 int open_flags = 0; | |
177 if (flags & FLAG_CREATE) | |
178 open_flags = O_CREAT | O_EXCL; | |
179 | |
180 created_ = false; | |
181 | |
182 if (flags & FLAG_CREATE_ALWAYS) { | |
183 DCHECK(!open_flags); | |
184 DCHECK(flags & FLAG_WRITE); | |
185 open_flags = O_CREAT | O_TRUNC; | |
186 } | |
187 | |
188 if (flags & FLAG_OPEN_TRUNCATED) { | |
189 DCHECK(!open_flags); | |
190 DCHECK(flags & FLAG_WRITE); | |
191 open_flags = O_TRUNC; | |
192 } | |
193 | |
194 if (!open_flags && !(flags & FLAG_OPEN) && !(flags & FLAG_OPEN_ALWAYS)) { | |
195 NOTREACHED(); | |
196 errno = EOPNOTSUPP; | |
197 error_details_ = FILE_ERROR_FAILED; | |
198 return; | |
199 } | |
200 | |
201 if (flags & FLAG_WRITE && flags & FLAG_READ) { | |
202 open_flags |= O_RDWR; | |
203 } else if (flags & FLAG_WRITE) { | |
204 open_flags |= O_WRONLY; | |
205 } else if (!(flags & FLAG_READ) && | |
206 !(flags & FLAG_WRITE_ATTRIBUTES) && | |
207 !(flags & FLAG_APPEND) && | |
208 !(flags & FLAG_OPEN_ALWAYS)) { | |
209 NOTREACHED(); | |
210 } | |
211 | |
212 if (flags & FLAG_TERMINAL_DEVICE) | |
213 open_flags |= O_NOCTTY | O_NDELAY; | |
214 | |
215 if (flags & FLAG_APPEND && flags & FLAG_READ) | |
216 open_flags |= O_APPEND | O_RDWR; | |
217 else if (flags & FLAG_APPEND) | |
218 open_flags |= O_APPEND | O_WRONLY; | |
219 | |
220 COMPILE_ASSERT(O_RDONLY == 0, O_RDONLY_must_equal_zero); | |
221 | |
222 int mode = S_IRUSR | S_IWUSR; | |
223 #if defined(OS_CHROMEOS) | |
224 mode |= S_IRGRP | S_IROTH; | |
225 #endif | |
226 | |
227 int descriptor = HANDLE_EINTR(open(name.value().c_str(), open_flags, mode)); | |
228 | |
229 if (flags & FLAG_OPEN_ALWAYS) { | |
230 if (descriptor < 0) { | |
231 open_flags |= O_CREAT; | |
232 if (flags & FLAG_EXCLUSIVE_READ || flags & FLAG_EXCLUSIVE_WRITE) | |
233 open_flags |= O_EXCL; // together with O_CREAT implies O_NOFOLLOW | |
234 | |
235 descriptor = HANDLE_EINTR(open(name.value().c_str(), open_flags, mode)); | |
236 if (descriptor >= 0) | |
237 created_ = true; | |
238 } | |
239 } | |
240 | |
241 if (descriptor < 0) { | |
242 error_details_ = File::OSErrorToFileError(errno); | |
243 return; | |
244 } | |
245 | |
246 if (flags & (FLAG_CREATE_ALWAYS | FLAG_CREATE)) | |
247 created_ = true; | |
248 | |
249 if (flags & FLAG_DELETE_ON_CLOSE) | |
250 unlink(name.value().c_str()); | |
251 | |
252 async_ = ((flags & FLAG_ASYNC) == FLAG_ASYNC); | |
253 error_details_ = FILE_OK; | |
254 file_.reset(descriptor); | |
255 ProtectFileDescriptor(descriptor); | |
256 } | |
257 #endif // !defined(OS_NACL) | |
258 | |
259 bool File::IsValid() const { | 169 bool File::IsValid() const { |
260 return file_.is_valid(); | 170 return file_.is_valid(); |
261 } | 171 } |
262 | 172 |
263 PlatformFile File::GetPlatformFile() const { | 173 PlatformFile File::GetPlatformFile() const { |
264 return file_.get(); | 174 return file_.get(); |
265 } | 175 } |
266 | 176 |
267 PlatformFile File::TakePlatformFile() { | 177 PlatformFile File::TakePlatformFile() { |
268 if (IsValid()) | 178 if (IsValid()) |
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534 void File::MemoryCheckingScopedFD::Check() const { | 444 void File::MemoryCheckingScopedFD::Check() const { |
535 unsigned int computed_checksum; | 445 unsigned int computed_checksum; |
536 ComputeMemoryChecksum(&computed_checksum); | 446 ComputeMemoryChecksum(&computed_checksum); |
537 CHECK_EQ(file_memory_checksum_, computed_checksum) << "corrupted fd memory"; | 447 CHECK_EQ(file_memory_checksum_, computed_checksum) << "corrupted fd memory"; |
538 } | 448 } |
539 | 449 |
540 void File::MemoryCheckingScopedFD::UpdateChecksum() { | 450 void File::MemoryCheckingScopedFD::UpdateChecksum() { |
541 ComputeMemoryChecksum(&file_memory_checksum_); | 451 ComputeMemoryChecksum(&file_memory_checksum_); |
542 } | 452 } |
543 | 453 |
| 454 // NaCl doesn't implement system calls to open files directly. |
| 455 #if !defined(OS_NACL) |
| 456 // TODO(erikkay): does it make sense to support FLAG_EXCLUSIVE_* here? |
| 457 void File::DoInitialize(const FilePath& name, uint32 flags) { |
| 458 ThreadRestrictions::AssertIOAllowed(); |
| 459 DCHECK(!IsValid()); |
| 460 |
| 461 int open_flags = 0; |
| 462 if (flags & FLAG_CREATE) |
| 463 open_flags = O_CREAT | O_EXCL; |
| 464 |
| 465 created_ = false; |
| 466 |
| 467 if (flags & FLAG_CREATE_ALWAYS) { |
| 468 DCHECK(!open_flags); |
| 469 DCHECK(flags & FLAG_WRITE); |
| 470 open_flags = O_CREAT | O_TRUNC; |
| 471 } |
| 472 |
| 473 if (flags & FLAG_OPEN_TRUNCATED) { |
| 474 DCHECK(!open_flags); |
| 475 DCHECK(flags & FLAG_WRITE); |
| 476 open_flags = O_TRUNC; |
| 477 } |
| 478 |
| 479 if (!open_flags && !(flags & FLAG_OPEN) && !(flags & FLAG_OPEN_ALWAYS)) { |
| 480 NOTREACHED(); |
| 481 errno = EOPNOTSUPP; |
| 482 error_details_ = FILE_ERROR_FAILED; |
| 483 return; |
| 484 } |
| 485 |
| 486 if (flags & FLAG_WRITE && flags & FLAG_READ) { |
| 487 open_flags |= O_RDWR; |
| 488 } else if (flags & FLAG_WRITE) { |
| 489 open_flags |= O_WRONLY; |
| 490 } else if (!(flags & FLAG_READ) && |
| 491 !(flags & FLAG_WRITE_ATTRIBUTES) && |
| 492 !(flags & FLAG_APPEND) && |
| 493 !(flags & FLAG_OPEN_ALWAYS)) { |
| 494 NOTREACHED(); |
| 495 } |
| 496 |
| 497 if (flags & FLAG_TERMINAL_DEVICE) |
| 498 open_flags |= O_NOCTTY | O_NDELAY; |
| 499 |
| 500 if (flags & FLAG_APPEND && flags & FLAG_READ) |
| 501 open_flags |= O_APPEND | O_RDWR; |
| 502 else if (flags & FLAG_APPEND) |
| 503 open_flags |= O_APPEND | O_WRONLY; |
| 504 |
| 505 COMPILE_ASSERT(O_RDONLY == 0, O_RDONLY_must_equal_zero); |
| 506 |
| 507 int mode = S_IRUSR | S_IWUSR; |
| 508 #if defined(OS_CHROMEOS) |
| 509 mode |= S_IRGRP | S_IROTH; |
| 510 #endif |
| 511 |
| 512 int descriptor = HANDLE_EINTR(open(name.value().c_str(), open_flags, mode)); |
| 513 |
| 514 if (flags & FLAG_OPEN_ALWAYS) { |
| 515 if (descriptor < 0) { |
| 516 open_flags |= O_CREAT; |
| 517 if (flags & FLAG_EXCLUSIVE_READ || flags & FLAG_EXCLUSIVE_WRITE) |
| 518 open_flags |= O_EXCL; // together with O_CREAT implies O_NOFOLLOW |
| 519 |
| 520 descriptor = HANDLE_EINTR(open(name.value().c_str(), open_flags, mode)); |
| 521 if (descriptor >= 0) |
| 522 created_ = true; |
| 523 } |
| 524 } |
| 525 |
| 526 if (descriptor < 0) { |
| 527 error_details_ = File::OSErrorToFileError(errno); |
| 528 return; |
| 529 } |
| 530 |
| 531 if (flags & (FLAG_CREATE_ALWAYS | FLAG_CREATE)) |
| 532 created_ = true; |
| 533 |
| 534 if (flags & FLAG_DELETE_ON_CLOSE) |
| 535 unlink(name.value().c_str()); |
| 536 |
| 537 async_ = ((flags & FLAG_ASYNC) == FLAG_ASYNC); |
| 538 error_details_ = FILE_OK; |
| 539 file_.reset(descriptor); |
| 540 ProtectFileDescriptor(descriptor); |
| 541 } |
| 542 #endif // !defined(OS_NACL) |
| 543 |
544 bool File::DoFlush() { | 544 bool File::DoFlush() { |
545 ThreadRestrictions::AssertIOAllowed(); | 545 ThreadRestrictions::AssertIOAllowed(); |
546 DCHECK(IsValid()); | 546 DCHECK(IsValid()); |
547 #if defined(OS_NACL) | 547 #if defined(OS_NACL) |
548 NOTIMPLEMENTED(); // NaCl doesn't implement fsync. | 548 NOTIMPLEMENTED(); // NaCl doesn't implement fsync. |
549 return true; | 549 return true; |
550 #elif defined(OS_LINUX) || defined(OS_ANDROID) | 550 #elif defined(OS_LINUX) || defined(OS_ANDROID) |
551 return !HANDLE_EINTR(fdatasync(file_.get())); | 551 return !HANDLE_EINTR(fdatasync(file_.get())); |
552 #else | 552 #else |
553 return !HANDLE_EINTR(fsync(file_.get())); | 553 return !HANDLE_EINTR(fsync(file_.get())); |
554 #endif | 554 #endif |
555 } | 555 } |
556 | 556 |
557 void File::SetPlatformFile(PlatformFile file) { | 557 void File::SetPlatformFile(PlatformFile file) { |
558 CHECK(!file_.is_valid()); | 558 CHECK(!file_.is_valid()); |
559 file_.reset(file); | 559 file_.reset(file); |
560 if (file_.is_valid()) | 560 if (file_.is_valid()) |
561 ProtectFileDescriptor(GetPlatformFile()); | 561 ProtectFileDescriptor(GetPlatformFile()); |
562 } | 562 } |
563 | 563 |
564 } // namespace base | 564 } // namespace base |
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