1 files changed, 114 insertions, 0 deletions
diff --git a/support/misc/xstat.c b/support/misc/xstat.c
new file mode 100644
index 0000000..6f751f7
--- /dev/null
+++ b/support/misc/xstat.c
@@ -0,0 +1,114 @@
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <errno.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+#include <unistd.h>
+
+#include "nfslib.h"
+#include "xstat.h"
+
+#ifdef HAVE_FSTATAT
+#ifdef HAVE_STATX
+
+static void
+statx_copy(struct stat *stbuf, const struct statx *stxbuf)
+{
+	stbuf->st_dev = makedev(stxbuf->stx_dev_major, stxbuf->stx_dev_minor);
+	stbuf->st_ino = stxbuf->stx_ino;
+	stbuf->st_mode = stxbuf->stx_mode;
+	stbuf->st_nlink = stxbuf->stx_nlink;
+	stbuf->st_uid = stxbuf->stx_uid;
+	stbuf->st_gid = stxbuf->stx_gid;
+	stbuf->st_rdev = makedev(stxbuf->stx_rdev_major, stxbuf->stx_rdev_minor);
+	stbuf->st_size = stxbuf->stx_size;
+	stbuf->st_blksize = stxbuf->stx_blksize;
+	stbuf->st_blocks = stxbuf->stx_blocks;
+	stbuf->st_atim.tv_sec = stxbuf->stx_atime.tv_sec;
+	stbuf->st_atim.tv_nsec = stxbuf->stx_atime.tv_nsec;
+	stbuf->st_mtim.tv_sec = stxbuf->stx_mtime.tv_sec;
+	stbuf->st_mtim.tv_nsec = stxbuf->stx_mtime.tv_nsec;
+	stbuf->st_ctim.tv_sec = stxbuf->stx_ctime.tv_sec;
+	stbuf->st_ctim.tv_nsec = stxbuf->stx_ctime.tv_nsec;
+}
+
+static int
+statx_do_stat(int fd, const char *pathname, struct stat *statbuf, int flags)
+{
+	static int statx_supported = 1;
+	struct statx stxbuf;
+	int ret;
+
+	if (statx_supported) {
+		ret = statx(fd, pathname, flags,
+				STATX_BASIC_STATS,
+				&stxbuf);
+		if (ret == 0) {
+			statx_copy(statbuf, &stxbuf);
+			return 0;
+		}
+		/* glibc emulation doesn't support AT_STATX_DONT_SYNC */
+		if (errno == EINVAL)
+			errno = ENOSYS;
+		if (errno == ENOSYS)
+			statx_supported = 0;
+	} else
+		errno = ENOSYS;
+	return -1;
+}
+
+static int
+statx_stat_nosync(int fd, const char *pathname, struct stat *statbuf, int flags)
+{
+	return statx_do_stat(fd, pathname, statbuf, flags | AT_STATX_DONT_SYNC);
+}
+
+#else
+
+static int
+statx_stat_nosync(int UNUSED(fd), const char *UNUSED(pathname), struct stat *UNUSED(statbuf), int UNUSED(flags))
+{
+	errno = ENOSYS;
+	return -1;
+}
+
+#endif /* HAVE_STATX */
+
+int xlstat(const char *pathname, struct stat *statbuf)
+{
+	if (statx_stat_nosync(AT_FDCWD, pathname, statbuf, AT_NO_AUTOMOUNT|
+				AT_SYMLINK_NOFOLLOW) == 0)
+		return 0;
+	else if (errno != ENOSYS)
+		return -1;
+	errno = 0;
+	return fstatat(AT_FDCWD, pathname, statbuf, AT_NO_AUTOMOUNT |
+			AT_SYMLINK_NOFOLLOW);
+}
+
+int xstat(const char *pathname, struct stat *statbuf)
+{
+	if (statx_stat_nosync(AT_FDCWD, pathname, statbuf, AT_NO_AUTOMOUNT) == 0)
+		return 0;
+	else if (errno != ENOSYS)
+		return -1;
+	errno = 0;
+	return fstatat(AT_FDCWD, pathname, statbuf, AT_NO_AUTOMOUNT);
+}
+
+#else
+
+int xlstat(const char *pathname, struct stat *statbuf)
+{
+	return lstat(pathname, statbuf);
+}
+
+int xstat(const char *pathname, struct stat *statbuf)
+{
+	return stat(pathname, statbuf);
+}
+#endif