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95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
/* Read a directory. Linux no-LFS version.
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Copyright (C) 2018-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <dirent.h>
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#if !_DIRENT_MATCHES_DIRENT64
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#include <dirstream.h>
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/* Read a directory entry from DIRP. */
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struct dirent *
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__readdir_unlocked (DIR *dirp)
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{
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struct dirent *dp;
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int saved_errno = errno;
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do
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{
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size_t reclen;
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if (dirp->offset >= dirp->size)
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{
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/* We've emptied out our buffer. Refill it. */
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size_t maxread = dirp->allocation;
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ssize_t bytes;
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bytes = __getdents (dirp->fd, dirp->data, maxread);
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if (bytes <= 0)
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{
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/* On some systems getdents fails with ENOENT when the
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open directory has been rmdir'd already. POSIX.1
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requires that we treat this condition like normal EOF. */
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if (bytes < 0 && errno == ENOENT)
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bytes = 0;
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/* Don't modifiy errno when reaching EOF. */
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if (bytes == 0)
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__set_errno (saved_errno);
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dp = NULL;
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break;
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}
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dirp->size = (size_t) bytes;
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/* Reset the offset into the buffer. */
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dirp->offset = 0;
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}
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dp = (struct dirent *) &dirp->data[dirp->offset];
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reclen = dp->d_reclen;
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dirp->offset += reclen;
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dirp->filepos = dp->d_off;
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/* Skip deleted files. */
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} while (dp->d_ino == 0);
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return dp;
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}
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struct dirent *
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__readdir (DIR *dirp)
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{
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struct dirent *dp;
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#if IS_IN (libc)
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__libc_lock_lock (dirp->lock);
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#endif
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dp = __readdir_unlocked (dirp);
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#if IS_IN (libc)
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__libc_lock_unlock (dirp->lock);
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#endif
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return dp;
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}
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weak_alias (__readdir, readdir)
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#endif
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