ipc/chromium/src/base/dir_reader_linux.h@6474c204b198 (annotated)
ipc/chromium/src/base/dir_reader_linux.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | // Copyright (c) 2010 The Chromium Authors. All rights reserved. |
| michael@0 | 2 | // Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 3 | // found in the LICENSE file. |
| michael@0 | 4 | |
| michael@0 | 5 | #ifndef BASE_DIR_READER_LINUX_H_ |
| michael@0 | 6 | #define BASE_DIR_READER_LINUX_H_ |
| michael@0 | 7 | #pragma once |
| michael@0 | 8 | |
| michael@0 | 9 | #include <errno.h> |
| michael@0 | 10 | #include <fcntl.h> |
| michael@0 | 11 | #include <stdint.h> |
| michael@0 | 12 | #include <sys/syscall.h> |
| michael@0 | 13 | #include <unistd.h> |
| michael@0 | 14 | |
| michael@0 | 15 | #include "base/logging.h" |
| michael@0 | 16 | #include "base/eintr_wrapper.h" |
| michael@0 | 17 | |
| michael@0 | 18 | // See the comments in dir_reader_posix.h about this. |
| michael@0 | 19 | |
| michael@0 | 20 | namespace base { |
| michael@0 | 21 | |
| michael@0 | 22 | struct linux_dirent { |
| michael@0 | 23 | uint64_t d_ino; |
| michael@0 | 24 | int64_t d_off; |
| michael@0 | 25 | unsigned short d_reclen; |
| michael@0 | 26 | unsigned char d_type; |
| michael@0 | 27 | char d_name[0]; |
| michael@0 | 28 | }; |
| michael@0 | 29 | |
| michael@0 | 30 | class DirReaderLinux { |
| michael@0 | 31 | public: |
| michael@0 | 32 | explicit DirReaderLinux(const char* directory_path) |
| michael@0 | 33 | : fd_(open(directory_path, O_RDONLY | O_DIRECTORY)), |
| michael@0 | 34 | offset_(0), |
| michael@0 | 35 | size_(0) { |
| michael@0 | 36 | memset(buf_, 0, sizeof(buf_)); |
| michael@0 | 37 | } |
| michael@0 | 38 | |
| michael@0 | 39 | ~DirReaderLinux() { |
| michael@0 | 40 | if (fd_ >= 0) { |
| michael@0 | 41 | if (HANDLE_EINTR(close(fd_))) |
| michael@0 | 42 | DLOG(ERROR) << "Failed to close directory handle"; |
| michael@0 | 43 | } |
| michael@0 | 44 | } |
| michael@0 | 45 | |
| michael@0 | 46 | bool IsValid() const { |
| michael@0 | 47 | return fd_ >= 0; |
| michael@0 | 48 | } |
| michael@0 | 49 | |
| michael@0 | 50 | // Move to the next entry returning false if the iteration is complete. |
| michael@0 | 51 | bool Next() { |
| michael@0 | 52 | if (size_) { |
| michael@0 | 53 | linux_dirent* dirent = reinterpret_cast<linux_dirent*>(&buf_[offset_]); |
| michael@0 | 54 | offset_ += dirent->d_reclen; |
| michael@0 | 55 | } |
| michael@0 | 56 | |
| michael@0 | 57 | if (offset_ != size_) |
| michael@0 | 58 | return true; |
| michael@0 | 59 | |
| michael@0 | 60 | const int r = syscall(__NR_getdents64, fd_, buf_, sizeof(buf_)); |
| michael@0 | 61 | if (r == 0) |
| michael@0 | 62 | return false; |
| michael@0 | 63 | if (r == -1) { |
| michael@0 | 64 | DLOG(ERROR) << "getdents64 returned an error: " << errno; |
| michael@0 | 65 | return false; |
| michael@0 | 66 | } |
| michael@0 | 67 | size_ = r; |
| michael@0 | 68 | offset_ = 0; |
| michael@0 | 69 | return true; |
| michael@0 | 70 | } |
| michael@0 | 71 | |
| michael@0 | 72 | const char* name() const { |
| michael@0 | 73 | if (!size_) |
| michael@0 | 74 | return NULL; |
| michael@0 | 75 | |
| michael@0 | 76 | const linux_dirent* dirent = |
| michael@0 | 77 | reinterpret_cast<const linux_dirent*>(&buf_[offset_]); |
| michael@0 | 78 | return dirent->d_name; |
| michael@0 | 79 | } |
| michael@0 | 80 | |
| michael@0 | 81 | int fd() const { |
| michael@0 | 82 | return fd_; |
| michael@0 | 83 | } |
| michael@0 | 84 | |
| michael@0 | 85 | static bool IsFallback() { |
| michael@0 | 86 | return false; |
| michael@0 | 87 | } |
| michael@0 | 88 | |
| michael@0 | 89 | private: |
| michael@0 | 90 | const int fd_; |
| michael@0 | 91 | unsigned char buf_[512]; |
| michael@0 | 92 | size_t offset_, size_; |
| michael@0 | 93 | |
| michael@0 | 94 | DISALLOW_COPY_AND_ASSIGN(DirReaderLinux); |
| michael@0 | 95 | }; |
| michael@0 | 96 | |
| michael@0 | 97 | } // namespace base |
| michael@0 | 98 | |
| michael@0 | 99 | #endif // BASE_DIR_READER_LINUX_H_ |
