2018-02-28 18:37:17 +00:00
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/* Get directory entries. Linux LFS version.
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2021-01-02 19:32:25 +00:00
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Copyright (C) 1997-2021 Free Software Foundation, Inc.
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2018-02-28 18:37:17 +00:00
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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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Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
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<https://www.gnu.org/licenses/>. */
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2018-02-28 18:37:17 +00:00
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#include <string.h>
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#include <dirent.h>
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#include <errno.h>
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2019-06-27 13:08:40 +00:00
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#include <limits.h>
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2018-02-28 18:37:17 +00:00
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2019-06-07 07:27:01 +00:00
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/* The kernel struct linux_dirent64 matches the 'struct dirent64' type. */
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2018-02-28 18:37:17 +00:00
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ssize_t
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2019-06-07 07:27:01 +00:00
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__getdents64 (int fd, void *buf, size_t nbytes)
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2018-02-28 18:37:17 +00:00
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{
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2019-06-27 13:08:40 +00:00
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/* The system call takes an unsigned int argument, and some length
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checks in the kernel use an int type. */
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if (nbytes > INT_MAX)
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nbytes = INT_MAX;
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2018-02-28 18:37:17 +00:00
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return INLINE_SYSCALL_CALL (getdents64, fd, buf, nbytes);
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}
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2019-06-07 07:27:01 +00:00
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libc_hidden_def (__getdents64)
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weak_alias (__getdents64, getdents64)
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2018-02-28 18:37:17 +00:00
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#if _DIRENT_MATCHES_DIRENT64
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strong_alias (__getdents64, __getdents)
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#else
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# include <shlib-compat.h>
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# if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2)
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2018-08-10 08:20:13 +00:00
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# include <olddirent.h>
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# include <unistd.h>
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2018-02-28 18:37:17 +00:00
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2018-08-10 08:20:13 +00:00
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static ssize_t
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handle_overflow (int fd, __off64_t offset, ssize_t count)
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2018-02-28 18:37:17 +00:00
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{
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2018-08-10 08:20:13 +00:00
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/* If this is the first entry in the buffer, we can report the
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error. */
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2018-12-10 13:14:45 +00:00
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if (offset == 0)
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2018-08-10 08:20:13 +00:00
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{
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__set_errno (EOVERFLOW);
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return -1;
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}
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/* Otherwise, seek to the overflowing entry, so that the next call
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2018-12-10 13:14:45 +00:00
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will report the error, and return the data read so far. */
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2018-08-10 08:20:13 +00:00
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if (__lseek64 (fd, offset, SEEK_SET) != 0)
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return -1;
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return count;
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}
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2018-02-28 18:37:17 +00:00
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ssize_t
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__old_getdents64 (int fd, char *buf, size_t nbytes)
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{
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2018-08-10 08:20:13 +00:00
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/* We do not move the individual directory entries. This is only
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possible if the target type (struct __old_dirent64) is smaller
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than the source type. */
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_Static_assert (offsetof (struct __old_dirent64, d_name)
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<= offsetof (struct dirent64, d_name),
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"__old_dirent64 is larger than dirent64");
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_Static_assert (__alignof__ (struct __old_dirent64)
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<= __alignof__ (struct dirent64),
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"alignment of __old_dirent64 is larger than dirent64");
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2018-02-28 18:37:17 +00:00
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2018-08-10 08:20:13 +00:00
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ssize_t retval = INLINE_SYSCALL_CALL (getdents64, fd, buf, nbytes);
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if (retval > 0)
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2018-02-28 18:37:17 +00:00
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{
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2018-12-10 13:14:45 +00:00
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/* This is the marker for the first entry. Offset 0 is reserved
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for the first entry (see rewinddir). Here, we use it as a
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marker for the first entry in the buffer. We never actually
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seek to offset 0 because handle_overflow reports the error
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directly, so it does not matter that the offset is incorrect
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if entries have been read from the descriptor before (so that
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the descriptor is not actually at offset 0). */
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__off64_t previous_offset = 0;
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2018-08-10 08:20:13 +00:00
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char *p = buf;
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char *end = buf + retval;
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while (p < end)
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2018-02-28 18:37:17 +00:00
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{
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2018-08-10 08:20:13 +00:00
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struct dirent64 *source = (struct dirent64 *) p;
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/* Copy out the fixed-size data. */
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__ino_t ino = source->d_ino;
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__off64_t offset = source->d_off;
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unsigned int reclen = source->d_reclen;
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unsigned char type = source->d_type;
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/* Check for ino_t overflow. */
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if (__glibc_unlikely (ino != source->d_ino))
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2018-12-10 13:14:45 +00:00
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return handle_overflow (fd, previous_offset, p - buf);
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2018-08-10 08:20:13 +00:00
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/* Convert to the target layout. Use a separate struct and
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memcpy to side-step aliasing issues. */
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struct __old_dirent64 result;
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result.d_ino = ino;
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result.d_off = offset;
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result.d_reclen = reclen;
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result.d_type = type;
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/* Write the fixed-sized part of the result to the
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buffer. */
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size_t result_name_offset = offsetof (struct __old_dirent64, d_name);
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memcpy (p, &result, result_name_offset);
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/* Adjust the position of the name if necessary. Copy
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everything until the end of the record, including the
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terminating NUL byte. */
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if (result_name_offset != offsetof (struct dirent64, d_name))
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memmove (p + result_name_offset, source->d_name,
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reclen - offsetof (struct dirent64, d_name));
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2018-02-28 18:37:17 +00:00
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2018-08-10 08:20:13 +00:00
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p += reclen;
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2018-12-10 13:14:45 +00:00
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previous_offset = offset;
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2018-02-28 18:37:17 +00:00
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}
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}
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return retval;
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}
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# endif /* SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2) */
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#endif /* _DIRENT_MATCHES_DIRENT64 */
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