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/* Test of opening a file stream.
Copyright (C) 2007-2022 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 Bruno Haible <bruno@clisp.org>, 2007. */
#include <config.h>
#include <stdio.h>
#include "signature.h"
SIGNATURE_CHECK (freopen, FILE *, (char const *, char const *, FILE *));
#include <errno.h>
#include <unistd.h>
#include "macros.h"
int
main ()
{
const char *filename = "test-freopen.txt";
close (STDIN_FILENO);
ASSERT (freopen ("/dev/null", "r", stdin) != NULL);
ASSERT (getchar () == EOF);
ASSERT (!ferror (stdin));
ASSERT (feof (stdin));
#if 0 /* freopen (NULL, ...) is unsupported on most platforms. */
/* Test that freopen() sets errno if someone else closes the stream
fd behind the back of stdio. */
{
FILE *fp = fopen (filename, "w+");
ASSERT (fp != NULL);
ASSERT (close (fileno (fp)) == 0);
errno = 0;
ASSERT (freopen (NULL, "r", fp) == NULL);
perror("freopen");
ASSERT (errno == EBADF);
fclose (fp);
}
/* Test that freopen() sets errno if the stream was constructed with
an invalid file descriptor. */
{
FILE *fp = fdopen (-1, "w+");
if (fp != NULL)
{
errno = 0;
ASSERT (freopen (NULL, "r", fp) == NULL);
ASSERT (errno == EBADF);
fclose (fp);
}
}
{
FILE *fp;
close (99);
fp = fdopen (99, "w+");
if (fp != NULL)
{
errno = 0;
ASSERT (freopen (NULL, "r", fp) == NULL);
ASSERT (errno == EBADF);
fclose (fp);
}
}
#endif
/* Clean up. */
unlink (filename);
return 0;
}
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