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/* Test of reopening a stream.
Copyright (C) 2009-2023 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/>. */
/* 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;
}
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