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[uclibc-ng-devel,4/4] fstatat: add wrapper that uses statx for non-legacy arch

Message ID 20230914142941.25389-4-yann@sionneau.net
State Accepted
Headers show
Series [uclibc-ng-devel,1/4] fstatat64: define it as a wrapper of statx if the kernel does not support fstatat64 syscall | expand

Commit Message

Yann Sionneau Sept. 14, 2023, 2:29 p.m. UTC 
From: Yann Sionneau <ysionneau@kalray.eu>

Add fstatat wrapper that uses statx for non-legacy arch.

This allows non-legacy arch to opt-out from defining the old stat* syscalls
by not defining __ARCH_WANT_NEW_STAT in their
arch/xxx/include/asm/unistd.h

Signed-off-by: Yann Sionneau <ysionneau@kalray.eu>

---
 libc/sysdeps/linux/common/fstatat.c | 39 +++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
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Patch

diff --git a/libc/sysdeps/linux/common/fstatat.c b/libc/sysdeps/linux/common/fstatat.c
index 13673d76c..db4a8327f 100644
--- a/libc/sysdeps/linux/common/fstatat.c
+++ b/libc/sysdeps/linux/common/fstatat.c
@@ -31,5 +31,44 @@  int fstatat(int fd, const char *file, struct stat *buf, int flag)
 }
 libc_hidden_def(fstatat)
 #else
+
+#if defined(__NR_statx)
+#include <sys/sysmacros.h> // for makedev
+
+int fstatat(int fd, const char *file, struct stat *buf, int flag)
+{
+	int ret;
+	struct statx tmp;
+
+	ret = INLINE_SYSCALL(statx, 5, fd, file, flag,
+			     STATX_BASIC_STATS, &tmp);
+	if (ret != 0)
+		return ret;
+
+	*buf = (struct stat) {
+		.st_dev = makedev(tmp.stx_dev_major, tmp.stx_dev_minor),
+		.st_ino = tmp.stx_ino,
+		.st_mode = tmp.stx_mode,
+		.st_nlink = tmp.stx_nlink,
+		.st_uid = tmp.stx_uid,
+		.st_gid = tmp.stx_gid,
+		.st_rdev = makedev(tmp.stx_rdev_major, tmp.stx_rdev_minor),
+		.st_size = tmp.stx_size,
+		.st_blksize = tmp.stx_blksize,
+		.st_blocks = tmp.stx_blocks,
+		.st_atim.tv_sec = tmp.stx_atime.tv_sec,
+		.st_atim.tv_nsec = tmp.stx_atime.tv_nsec,
+		.st_mtim.tv_sec = tmp.stx_mtime.tv_sec,
+		.st_mtim.tv_nsec = tmp.stx_mtime.tv_nsec,
+		.st_ctim.tv_sec = tmp.stx_ctime.tv_sec,
+		.st_ctim.tv_nsec = tmp.stx_ctime.tv_nsec,
+	};
+
+	return ret;
+}
+libc_hidden_def(fstatat)
+
+#endif
+
 /* should add emulation with fstat() and /proc/self/fd/ ... */
 #endif