/* Regression test for reported old bug that errno is clobbered

   by the first successful output to a stream on an unseekable object.

   Copyright (C) 1995-2018 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 <unistd.h>

int

main (void)

{

  int fd[2];

  FILE *f;

  /* Get a stream that cannot seek.  */

  if (pipe (fd))

    {

      perror ("pipe");

      return 1;

    }

  f = fdopen (fd[1], "w");

  if (f == NULL)

    {

      perror ("fdopen");

      return 1;

    }

  errno = 0;

  if (fputs ("fnord", f) == EOF)

    {

      perror ("fputs");

      return 1;

    }

  if (errno)

    {

      perror ("errno gratuitously set -- TEST FAILED");

      return 1;

    }

  puts ("Test succeeded.");

  return 0;

}