/* Test duplicating a file descriptor.

   Copyright (C) 2011-2018 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

#include <config.h>

#include <unistd.h>

#include "signature.h"

SIGNATURE_CHECK (dup, int, (int));

#include <errno.h>

#include "macros.h"

int

main (void)

{

  /* Test behaviour for invalid file descriptors.  */

  {

    errno = 0;

    ASSERT (dup (-1) == -1);

    ASSERT (errno == EBADF);

  }

  {

    close (99);

    errno = 0;

    ASSERT (dup (99) == -1);

    ASSERT (errno == EBADF);

  }

  return 0;

}