Linux: consolidate lchown implementation

Use lchown syscall if defined, otherwise use fchownat.

Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/lchown.c b/sysdeps/unix/sysv/linux/lchown.c
new file mode 100644
index 0000000000..4888e5f194
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/lchown.c
@@ -0,0 +1,34 @@
+/* Change ownership of a file.  Linux version.
+   Copyright (C) 2011-2022 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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <sysdep.h>
+
+/* Change the owner and group of FILE.  */
+int
+__lchown (const char *file, uid_t owner, gid_t group)
+{
+#ifdef __NR_lchown
+  return INLINE_SYSCALL_CALL (lchown, file, owner, group);
+#else
+  return INLINE_SYSCALL_CALL (fchownat, AT_FDCWD, file, owner, group,
+			      AT_SYMLINK_NOFOLLOW);
+#endif
+}
+weak_alias (__lchown, lchown)