/* Linux implementation for renameat2 function.

   Copyright (C) 2018 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

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <stdio.h>

#include <sysdep.h>

int

renameat2 (int oldfd, const char *old, int newfd, const char *new,

           unsigned int flags)

{

#if !defined (__NR_renameat) || defined (__ASSUME_RENAMEAT2)

  return INLINE_SYSCALL_CALL (renameat2, oldfd, old, newfd, new, flags);

#else

  if (flags == 0)

    return __renameat (oldfd, old, newfd, new);

# ifdef __NR_renameat2

  /* For non-zero flags, try the renameat2 system call.  */

  int ret = INLINE_SYSCALL_CALL (renameat2, oldfd, old, newfd, new, flags);

  if (ret != -1 || errno != ENOSYS)

    /* Preserve non-error/non-ENOSYS return values.  */

    return ret;

# endif

  /* No kernel (header) support for renameat2.  All flags are

     unknown.  */

  __set_errno (EINVAL);

  return -1;

#endif

}