1/* Read a directory. Linux no-LFS version.
2 Copyright (C) 2018-2023 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. */
25struct dirent *
26__readdir_unlocked (DIR *dirp)
27{
28 struct dirent *dp;
29 int saved_errno = errno;
30
31 if (dirp->offset >= dirp->size)
32 {
33 /* We've emptied out our buffer. Refill it. */
34
35 size_t maxread = dirp->allocation;
36 ssize_t bytes;
37
38 bytes = __getdents (dirp->fd, dirp->data, maxread);
39 if (bytes <= 0)
40 {
41 /* Linux may fail with ENOENT on some file systems if the
42 directory inode is marked as dead (deleted). POSIX
43 treats this as a regular end-of-directory condition, so
44 do not set errno in that case, to indicate success. */
45 if (bytes == 0 || errno == ENOENT)
46 __set_errno (saved_errno);
47 return NULL;
48 }
49 dirp->size = (size_t) bytes;
50
51 /* Reset the offset into the buffer. */
52 dirp->offset = 0;
53 }
54
55 dp = (struct dirent *) &dirp->data[dirp->offset];
56 dirp->offset += dp->d_reclen;
57 dirp->filepos = dp->d_off;
58
59 return dp;
60}
61
62struct dirent *
63__readdir (DIR *dirp)
64{
65 struct dirent *dp;
66
67#if IS_IN (libc)
68 __libc_lock_lock (dirp->lock);
69#endif
70 dp = __readdir_unlocked (dirp);
71#if IS_IN (libc)
72 __libc_lock_unlock (dirp->lock);
73#endif
74
75 return dp;
76}
77weak_alias (__readdir, readdir)
78
79#endif
80