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@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-3-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

diff --git a/tools/include/nolibc/sys/stat.h b/tools/include/nolibc/sys/stat.h
index 987c8bb52502f1f758005b0afdfb2e39fc8ea1c6..8b4d80e3ea0360e3e6280f6c6166e87f793ddee4 100644 (file)
--- a/tools/include/nolibc/sys/stat.h
+++ b/tools/include/nolibc/sys/stat.h
@@ -17,6 +17,9 @@
 /*
  * 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))
@@ -37,12 +40,12 @@ 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;
 
@@ -70,4 +73,22 @@ 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);
+}
+
 #endif /* _NOLIBC_SYS_STAT_H */