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| 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 | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef BASE_FILES_DIR_READER_LINUX_H_ | |
| 6 #define BASE_FILES_DIR_READER_LINUX_H_ | |
| 7 | |
| 8 #include <errno.h> | |
| 9 #include <fcntl.h> | |
| 10 #include <stdint.h> | |
| 11 #include <sys/syscall.h> | |
| 12 #include <unistd.h> | |
| 13 | |
| 14 #include "base/logging.h" | |
| 15 #include "base/posix/eintr_wrapper.h" | |
| 16 | |
| 17 // See the comments in dir_reader_posix.h about this. | |
| 18 | |
| 19 namespace base { | |
| 20 | |
| 21 struct linux_dirent { | |
| 22 uint64_t d_ino; | |
| 23 int64_t d_off; | |
| 24 unsigned short d_reclen; | |
| 25 unsigned char d_type; | |
| 26 char d_name[0]; | |
| 27 }; | |
| 28 | |
| 29 class DirReaderLinux { | |
| 30 public: | |
| 31 explicit DirReaderLinux(const char* directory_path) | |
| 32 : fd_(open(directory_path, O_RDONLY | O_DIRECTORY)), | |
| 33 offset_(0), | |
| 34 size_(0) { | |
| 35 memset(buf_, 0, sizeof(buf_)); | |
| 36 } | |
| 37 | |
| 38 ~DirReaderLinux() { | |
| 39 if (fd_ >= 0) { | |
| 40 if (IGNORE_EINTR(close(fd_))) | |
| 41 RAW_LOG(ERROR, "Failed to close directory handle"); | |
| 42 } | |
| 43 } | |
| 44 | |
| 45 bool IsValid() const { | |
| 46 return fd_ >= 0; | |
| 47 } | |
| 48 | |
| 49 // Move to the next entry returning false if the iteration is complete. | |
| 50 bool Next() { | |
| 51 if (size_) { | |
| 52 linux_dirent* dirent = reinterpret_cast<linux_dirent*>(&buf_[offset_]); | |
| 53 offset_ += dirent->d_reclen; | |
| 54 } | |
| 55 | |
| 56 if (offset_ != size_) | |
| 57 return true; | |
| 58 | |
| 59 const int r = syscall(__NR_getdents64, fd_, buf_, sizeof(buf_)); | |
| 60 if (r == 0) | |
| 61 return false; | |
| 62 if (r == -1) { | |
| 63 DPLOG(FATAL) << "getdents64 returned an error: " << errno; | |
| 64 return false; | |
| 65 } | |
| 66 size_ = r; | |
| 67 offset_ = 0; | |
| 68 return true; | |
| 69 } | |
| 70 | |
| 71 const char* name() const { | |
| 72 if (!size_) | |
| 73 return NULL; | |
| 74 | |
| 75 const linux_dirent* dirent = | |
| 76 reinterpret_cast<const linux_dirent*>(&buf_[offset_]); | |
| 77 return dirent->d_name; | |
| 78 } | |
| 79 | |
| 80 int fd() const { | |
| 81 return fd_; | |
| 82 } | |
| 83 | |
| 84 static bool IsFallback() { | |
| 85 return false; | |
| 86 } | |
| 87 | |
| 88 private: | |
| 89 const int fd_; | |
| 90 unsigned char buf_[512]; | |
| 91 size_t offset_, size_; | |
| 92 | |
| 93 DISALLOW_COPY_AND_ASSIGN(DirReaderLinux); | |
| 94 }; | |
| 95 | |
| 96 } // namespace base | |
| 97 | |
| 98 #endif // BASE_FILES_DIR_READER_LINUX_H_ | |
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