linux-kernel - [PATCH 03/15] tools/nolibc: add more stat() variants

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Message-Id: <20250423-nolibc-misc-v1-3-a925bf40297b@linutronix.de>
Date: Wed, 23 Apr 2025 17:01:33 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Willy Tarreau <w@....eu>, 
 Thomas Weißschuh <linux@...ssschuh.net>, 
 Shuah Khan <shuah@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH 03/15] tools/nolibc: add more stat() variants

Add fstat(), fstatat() and lstat(). All of them use the existing implementation
based on statx().

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 tools/include/nolibc/sys/stat.h | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/tools/include/nolibc/sys/stat.h b/tools/include/nolibc/sys/stat.h
index 0eaf5496ce233a4d8b5a239eef5ecefe05a39dd6..53c5c8addc829e36b927c3dd39b2a24f3472dcf0 100644
--- a/tools/include/nolibc/sys/stat.h
+++ b/tools/include/nolibc/sys/stat.h
@@ -14,6 +14,9 @@
 /*
  * int statx(int fd, const char *path, int flags, unsigned int mask, struct statx *buf);
  * int stat(const char *path, struct stat *buf);
+ * int fstatat(int fd, const char *path, struct stat *buf, int flag);
+ * int fstat(int fildes, struct stat *buf);
+ * int lstat(const char *path, struct stat *buf);
  */
 
 static __attribute__((unused))
@@ -34,12 +37,12 @@ int statx(int fd, const char *path, int flags, unsigned int mask, struct statx *
 
 
 static __attribute__((unused))
-int stat(const char *path, struct stat *buf)
+int fstatat(int fd, const char *path, struct stat *buf, int flag)
 {
 	struct statx statx;
 	long ret;
 
-	ret = __sysret(sys_statx(AT_FDCWD, path, AT_NO_AUTOMOUNT, STATX_BASIC_STATS, &statx));
+	ret = __sysret(sys_statx(fd, path, flag | AT_NO_AUTOMOUNT, STATX_BASIC_STATS, &statx));
 	if (ret == -1)
 		return ret;
 
@@ -67,6 +70,24 @@ int stat(const char *path, struct stat *buf)
 	return 0;
 }
 
+static __attribute__((unused))
+int stat(const char *path, struct stat *buf)
+{
+	return fstatat(AT_FDCWD, path, buf, 0);
+}
+
+static __attribute__((unused))
+int fstat(int fildes, struct stat *buf)
+{
+	return fstatat(fildes, "", buf, AT_EMPTY_PATH);
+}
+
+static __attribute__((unused))
+int lstat(const char *path, struct stat *buf)
+{
+	return fstatat(AT_FDCWD, path, buf, AT_SYMLINK_NOFOLLOW);
+}
+
 
 /* make sure to include all global symbols */
 #include "../nolibc.h"

-- 
2.49.0