/* Test of reopening a stream.

   Copyright (C) 2009-2017 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 <http://www.gnu.org/licenses/>.  */

/* Written by Eric Blake <ebb9@byu.net>, 2009.  */

#include <config.h>

/* Specification.  */

#include "stdio--.h"

/* Helpers.  */

#include <unistd.h>

/* This test intentionally closes stderr.  So, we arrange to have fd 10

   (outside the range of interesting fd's during the test) set up to

   duplicate the original stderr.  */

#define BACKUP_STDERR_FILENO 10

#define ASSERT_STREAM myerr

#include "macros.h"

static FILE *myerr;

int

main (void)

{

  FILE *fp;

  /* We close fd 2 later, so save it in fd 10.  */

  if (dup2 (STDERR_FILENO, BACKUP_STDERR_FILENO) != BACKUP_STDERR_FILENO

      || (myerr = fdopen (BACKUP_STDERR_FILENO, "w")) == NULL)

    return 2;

  {

    FILE *tmp;

    ASSERT (tmp = fopen ("/dev/null", "r"));

    ASSERT (STDERR_FILENO < fileno (tmp));

    ASSERT (fp = fopen ("/dev/null", "w"));

    ASSERT (fileno (tmp) < fileno (fp));

    ASSERT (fclose (tmp) == 0);

  }

  /* Gap in fds.  */

  ASSERT (freopen ("/dev/null", "r+", fp) == fp);

  ASSERT (STDERR_FILENO < fileno (fp));

  ASSERT (freopen ("/dev/null", "r", stdin) == stdin);

  ASSERT (STDIN_FILENO == fileno (stdin));

  ASSERT (freopen ("/dev/null", "w", stdout) == stdout);

  ASSERT (STDOUT_FILENO == fileno (stdout));

  ASSERT (freopen ("/dev/null", "w", stderr) == stderr);

  ASSERT (STDERR_FILENO == fileno (stderr));

  /* fd 0 closed.  */

  ASSERT (close (STDIN_FILENO) == 0);

  ASSERT (freopen ("/dev/null", "w", stdout) == stdout);

  ASSERT (STDOUT_FILENO == fileno (stdout));

  ASSERT (freopen ("/dev/null", "w", stderr) == stderr);

  ASSERT (STDERR_FILENO == fileno (stderr));

  ASSERT (freopen ("/dev/null", "a", fp) == fp);

  ASSERT (STDERR_FILENO < fileno (fp));

  /* fd 1 closed.  */

  ASSERT (close (STDOUT_FILENO) == 0);

  ASSERT (freopen ("/dev/null", "w", stderr) == stderr);

  ASSERT (STDERR_FILENO == fileno (stderr));

  ASSERT (freopen ("/dev/null", "a+", fp) == fp);

  ASSERT (STDERR_FILENO < fileno (fp));

  /* fd 2 closed.  */

  ASSERT (close (STDERR_FILENO) == 0);

  ASSERT (freopen ("/dev/null", "w+", fp) == fp);

  ASSERT (STDERR_FILENO < fileno (fp));

  return 0;

}