/* Copyright (C) 2008-2018 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 <fcntl.h>

#include <unistd.h>

/* Duplicate FD to FD2, closing the old FD2 and making FD2 be

   open the same file as FD is which setting flags according to

   FLAGS.  Return FD2 or -1.  */

int

__dup3 (int fd, int fd2, int flags)

{

  if (fd < 0 || fd2 < 0)

    {

      __set_errno (EBADF);

      return -1;

    }

  if (fd == fd2)

    /* No way to check that they are valid.  */

    return fd2;

  __set_errno (ENOSYS);

  return -1;

}

libc_hidden_def (__dup3)

weak_alias (__dup3, dup3)

stub_warning (dup3)