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-rw-r--r--io/statx_generic.c81
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diff --git a/io/statx_generic.c b/io/statx_generic.c
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+/* Generic implementation of statx based on fstatat64.
+ Copyright (C) 2018 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+
+static inline struct statx_timestamp
+statx_convert_timestamp (struct timespec tv)
+{
+ return (struct statx_timestamp) { tv.tv_sec, tv.tv_nsec };
+}
+
+/* Approximate emulation of statx. This will always fill in
+ POSIX-mandated attributes even if the underlying file system does
+ not actually support it (for example, GID and UID on file systems
+ without UNIX-style permissions). */
+static __attribute__ ((unused)) int
+statx_generic (int fd, const char *path, int flags,
+ unsigned int mask, struct statx *buf)
+{
+ /* Flags which need to be cleared before passing them to
+ fstatat64. */
+ static const int clear_flags = AT_STATX_SYNC_AS_STAT;
+
+ /* Flags supported by our emulation. */
+ static const int supported_flags
+ = AT_EMPTY_PATH | AT_NO_AUTOMOUNT | AT_SYMLINK_NOFOLLOW | clear_flags;
+
+ if (__glibc_unlikely ((flags & ~supported_flags) != 0))
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ struct stat64 st;
+ int ret = __fstatat64 (fd, path, &st, flags & ~clear_flags);
+ if (ret != 0)
+ return ret;
+
+ /* The interface is defined in such a way that unused (padding)
+ fields have to be cleared. STATX_BASIC_STATS corresponds to the
+ data which is available via fstatat64. */
+ *buf = (struct statx)
+ {
+ .stx_mask = STATX_BASIC_STATS,
+ .stx_blksize = st.st_blksize,
+ .stx_nlink = st.st_nlink,
+ .stx_uid = st.st_uid,
+ .stx_gid = st.st_gid,
+ .stx_mode = st.st_mode,
+ .stx_ino = st.st_ino,
+ .stx_size = st.st_size,
+ .stx_blocks = st.st_blocks,
+ .stx_atime = statx_convert_timestamp (st.st_atim),
+ .stx_ctime = statx_convert_timestamp (st.st_ctim),
+ .stx_mtime = statx_convert_timestamp (st.st_mtim),
+ .stx_rdev_major = major (st.st_rdev),
+ .stx_rdev_minor = minor (st.st_rdev),
+ .stx_dev_major = major (st.st_dev),
+ .stx_dev_minor = minor (st.st_dev),
+ };
+
+ return 0;
+}