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/* Read a directory in reentrant mode. Linux LFS version.
Copyright (C) 1997-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* When _DIRENT_MATCHES_DIRENT64 is defined we can alias 'readdir64' to
'readdir'. However the function signatures are not equal due
different return types, so we need to suppress {__}readdir so weak
and strong alias do not throw conflicting types errors. */
#define readdir_r __no_readdir_r_decl
#define __readdir_r __no___readdir_r_decl
#include <dirent.h>
#undef __readdir_r
#undef readdir_r
/* Read a directory entry from DIRP. */
int
__readdir64_r (DIR *dirp, struct dirent64 *entry, struct dirent64 **result)
{
struct dirent64 *dp;
size_t reclen;
const int saved_errno = errno;
int ret;
__libc_lock_lock (dirp->lock);
while (1)
{
if (dirp->offset >= dirp->size)
{
/* We've emptied out our buffer. Refill it. */
size_t maxread = dirp->allocation;
ssize_t bytes;
maxread = dirp->allocation;
bytes = __getdents64 (dirp->fd, dirp->data, maxread);
if (bytes <= 0)
{
/* On some systems getdents fails with ENOENT when the
open directory has been rmdir'd already. POSIX.1
requires that we treat this condition like normal EOF. */
if (bytes < 0 && errno == ENOENT)
{
bytes = 0;
__set_errno (saved_errno);
}
if (bytes < 0)
dirp->errcode = errno;
dp = NULL;
break;
}
dirp->size = (size_t) bytes;
/* Reset the offset into the buffer. */
dirp->offset = 0;
}
dp = (struct dirent64 *) &dirp->data[dirp->offset];
reclen = dp->d_reclen;
dirp->offset += reclen;
dirp->filepos = dp->d_off;
if (reclen <= offsetof (struct dirent64, d_name) + NAME_MAX + 1)
break;
/* The record is very long. It could still fit into the
caller-supplied buffer if we can skip padding at the end. */
size_t namelen = _D_EXACT_NAMLEN (dp);
if (namelen <= NAME_MAX)
{
reclen = offsetof (struct dirent64, d_name) + namelen + 1;
break;
}
/* The name is too long. Ignore this file. */
dirp->errcode = ENAMETOOLONG;
}
if (dp != NULL)
{
*result = memcpy (entry, dp, reclen);
entry->d_reclen = reclen;
ret = 0;
}
else
{
*result = NULL;
ret = dirp->errcode;
}
__libc_lock_unlock (dirp->lock);
return ret;
}
#if _DIRENT_MATCHES_DIRENT64
strong_alias (__readdir64_r, __readdir_r)
weak_alias (__readdir64_r, readdir_r)
weak_alias (__readdir64_r, readdir64_r)
#else
/* The compat code expects the 'struct direct' with d_ino being a __ino_t
instead of __ino64_t. */
# include <shlib-compat.h>
versioned_symbol (libc, __readdir64_r, readdir64_r, GLIBC_2_2);
# if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2)
# include <olddirent.h>
int
attribute_compat_text_section
__old_readdir64_r (DIR *dirp, struct __old_dirent64 *entry,
struct __old_dirent64 **result)
{
while (1)
{
struct dirent64 new_entry;
struct dirent64 *newp;
int ret = __readdir64_r (dirp, &new_entry, &newp);
if (ret != 0)
return ret;
else if (newp == NULL)
{
*result = NULL;
return 0;
}
else
{
entry->d_ino = newp->d_ino;
if (entry->d_ino != newp->d_ino)
{
dirp->errcode = EOVERFLOW;
continue;
}
size_t namelen = strlen (newp->d_name);
entry->d_off = newp->d_off;
entry->d_reclen = (offsetof (struct __old_dirent64, d_name)
+ namelen + 1);
entry->d_type = newp->d_type;
memcpy (entry->d_name, newp->d_name, namelen + 1);
*result = entry;
return 0;
}
}
}
compat_symbol (libc, __old_readdir64_r, readdir64_r, GLIBC_2_1);
# endif /* SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2) */
#endif /* _DIRENT_MATCHES_DIRENT64 */
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