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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 #include "platform/globals.h" | 5 #include "platform/globals.h" |
6 #if defined(TARGET_OS_LINUX) | 6 #if defined(TARGET_OS_LINUX) |
7 | 7 |
8 #include "bin/file.h" | 8 #include "bin/file.h" |
9 | 9 |
10 #include <errno.h> // NOLINT | 10 #include <errno.h> // NOLINT |
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361 } | 361 } |
362 | 362 |
363 | 363 |
364 char* File::LinkTarget(const char* pathname) { | 364 char* File::LinkTarget(const char* pathname) { |
365 struct stat64 link_stats; | 365 struct stat64 link_stats; |
366 if (TEMP_FAILURE_RETRY(lstat64(pathname, &link_stats)) != 0) return NULL; | 366 if (TEMP_FAILURE_RETRY(lstat64(pathname, &link_stats)) != 0) return NULL; |
367 if (!S_ISLNK(link_stats.st_mode)) { | 367 if (!S_ISLNK(link_stats.st_mode)) { |
368 errno = ENOENT; | 368 errno = ENOENT; |
369 return NULL; | 369 return NULL; |
370 } | 370 } |
371 size_t target_size = link_stats.st_size; | 371 // Don't rely on the link_stats.st_size for the size of the link |
372 char* target_name = reinterpret_cast<char*>(malloc(target_size + 1)); | 372 // target. For some filesystems, e.g. procfs, this value is always |
373 size_t read_size = NO_RETRY_EXPECTED( | 373 // 0. Also the link might have changed before the readlink call. |
374 readlink(pathname, target_name, target_size + 1)); | 374 const int kBufferSize = PATH_MAX + 1; |
375 if (read_size != target_size) { | 375 char target[kBufferSize]; |
376 free(target_name); | 376 size_t target_size = TEMP_FAILURE_RETRY( |
| 377 readlink(pathname, target, kBufferSize)); |
| 378 if (target_size <= 0) { |
377 return NULL; | 379 return NULL; |
378 } | 380 } |
| 381 char* target_name = reinterpret_cast<char*>(malloc(target_size + 1)); |
| 382 if (target_name == NULL) { |
| 383 return NULL; |
| 384 } |
| 385 memmove(target_name, target, target_size); |
379 target_name[target_size] = '\0'; | 386 target_name[target_size] = '\0'; |
380 return target_name; | 387 return target_name; |
381 } | 388 } |
382 | 389 |
383 | 390 |
384 bool File::IsAbsolutePath(const char* pathname) { | 391 bool File::IsAbsolutePath(const char* pathname) { |
385 return (pathname != NULL && pathname[0] == '/'); | 392 return (pathname != NULL && pathname[0] == '/'); |
386 } | 393 } |
387 | 394 |
388 | 395 |
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452 return (file_1_info.st_ino == file_2_info.st_ino && | 459 return (file_1_info.st_ino == file_2_info.st_ino && |
453 file_1_info.st_dev == file_2_info.st_dev) ? | 460 file_1_info.st_dev == file_2_info.st_dev) ? |
454 File::kIdentical : | 461 File::kIdentical : |
455 File::kDifferent; | 462 File::kDifferent; |
456 } | 463 } |
457 | 464 |
458 } // namespace bin | 465 } // namespace bin |
459 } // namespace dart | 466 } // namespace dart |
460 | 467 |
461 #endif // defined(TARGET_OS_LINUX) | 468 #endif // defined(TARGET_OS_LINUX) |
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