1 /* Read a directory. Linux no-LFS version. 2 Copyright (C) 2018-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #include <dirent.h> 20 21 #if !_DIRENT_MATCHES_DIRENT64 22 #include <dirstream.h> 23 24 /* Read a directory entry from DIRP. */ 25 struct dirent * __readdir_unlocked(DIR * dirp)26__readdir_unlocked (DIR *dirp) 27 { 28 struct dirent *dp; 29 int saved_errno = errno; 30 31 do 32 { 33 size_t reclen; 34 35 if (dirp->offset >= dirp->size) 36 { 37 /* We've emptied out our buffer. Refill it. */ 38 39 size_t maxread = dirp->allocation; 40 ssize_t bytes; 41 42 bytes = __getdents (dirp->fd, dirp->data, maxread); 43 if (bytes <= 0) 44 { 45 /* On some systems getdents fails with ENOENT when the 46 open directory has been rmdir'd already. POSIX.1 47 requires that we treat this condition like normal EOF. */ 48 if (bytes < 0 && errno == ENOENT) 49 bytes = 0; 50 51 /* Don't modifiy errno when reaching EOF. */ 52 if (bytes == 0) 53 __set_errno (saved_errno); 54 dp = NULL; 55 break; 56 } 57 dirp->size = (size_t) bytes; 58 59 /* Reset the offset into the buffer. */ 60 dirp->offset = 0; 61 } 62 63 dp = (struct dirent *) &dirp->data[dirp->offset]; 64 65 reclen = dp->d_reclen; 66 67 dirp->offset += reclen; 68 69 dirp->filepos = dp->d_off; 70 71 /* Skip deleted files. */ 72 } while (dp->d_ino == 0); 73 74 return dp; 75 } 76 77 struct dirent * __readdir(DIR * dirp)78__readdir (DIR *dirp) 79 { 80 struct dirent *dp; 81 82 #if IS_IN (libc) 83 __libc_lock_lock (dirp->lock); 84 #endif 85 dp = __readdir_unlocked (dirp); 86 #if IS_IN (libc) 87 __libc_lock_unlock (dirp->lock); 88 #endif 89 90 return dp; 91 } 92 weak_alias (__readdir, readdir) 93 94 #endif 95