91 lines
3.1 KiB
C
91 lines
3.1 KiB
C
/* Generic implementation of statx based on fstatat64.
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Copyright (C) 2018-2022 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 <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/sysmacros.h>
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/* Obtain the original definition of struct statx. */
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#undef __statx_defined
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#define statx original_statx
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#include <bits/types/struct_statx.h>
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#undef statx
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static inline struct statx_timestamp
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statx_convert_timestamp (struct timespec tv)
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{
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return (struct statx_timestamp) { tv.tv_sec, tv.tv_nsec };
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}
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/* Approximate emulation of statx. This will always fill in
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POSIX-mandated attributes even if the underlying file system does
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not actually support it (for example, GID and UID on file systems
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without UNIX-style permissions). */
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static __attribute__ ((unused)) int
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statx_generic (int fd, const char *path, int flags,
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unsigned int mask, struct statx *buf)
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{
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/* Flags which need to be cleared before passing them to
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fstatat64. */
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static const int clear_flags = AT_STATX_SYNC_AS_STAT;
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/* Flags supported by our emulation. */
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static const int supported_flags
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= AT_EMPTY_PATH | AT_NO_AUTOMOUNT | AT_SYMLINK_NOFOLLOW | clear_flags;
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if (__glibc_unlikely ((flags & ~supported_flags) != 0))
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{
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__set_errno (EINVAL);
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return -1;
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}
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struct stat64 st;
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int ret = __fstatat64 (fd, path, &st, flags & ~clear_flags);
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if (ret != 0)
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return ret;
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/* The interface is defined in such a way that unused (padding)
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fields have to be cleared. STATX_BASIC_STATS corresponds to the
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data which is available via fstatat64. */
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struct original_statx obuf =
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{
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.stx_mask = STATX_BASIC_STATS,
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.stx_blksize = st.st_blksize,
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.stx_nlink = st.st_nlink,
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.stx_uid = st.st_uid,
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.stx_gid = st.st_gid,
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.stx_mode = st.st_mode,
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.stx_ino = st.st_ino,
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.stx_size = st.st_size,
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.stx_blocks = st.st_blocks,
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.stx_atime = statx_convert_timestamp (st.st_atim),
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.stx_ctime = statx_convert_timestamp (st.st_ctim),
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.stx_mtime = statx_convert_timestamp (st.st_mtim),
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.stx_rdev_major = major (st.st_rdev),
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.stx_rdev_minor = minor (st.st_rdev),
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.stx_dev_major = major (st.st_dev),
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.stx_dev_minor = minor (st.st_dev),
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};
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_Static_assert (sizeof (*buf) >= sizeof (obuf), "struct statx size");
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memcpy (buf, &obuf, sizeof (obuf));
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return 0;
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}
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