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/* Test of fclose module.
Copyright (C) 2011-2021 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, 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. */
#include <config.h>
#include <stdio.h>
#include "signature.h"
SIGNATURE_CHECK (fclose, int, (FILE *));
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "macros.h"
#define BASE "test-fclose.t"
int
main (int argc, char **argv)
{
const char buf[] = "hello world";
int fd;
int fd2;
FILE *f;
/* Prepare a seekable file. */
fd = open (BASE, O_RDWR | O_CREAT | O_TRUNC, 0600);
ASSERT (0 <= fd);
ASSERT (write (fd, buf, sizeof buf) == sizeof buf);
ASSERT (lseek (fd, 1, SEEK_SET) == 1);
/* Create an output stream visiting the file; when it is closed, all
other file descriptors visiting the file must see the new file
position. */
fd2 = dup (fd);
ASSERT (0 <= fd2);
f = fdopen (fd2, "w");
ASSERT (f);
ASSERT (fputc (buf[1], f) == buf[1]);
ASSERT (fclose (f) == 0);
errno = 0;
ASSERT (lseek (fd2, 0, SEEK_CUR) == -1);
ASSERT (errno == EBADF);
ASSERT (lseek (fd, 0, SEEK_CUR) == 2);
/* Likewise for an input stream. */
fd2 = dup (fd);
ASSERT (0 <= fd2);
f = fdopen (fd2, "r");
ASSERT (f);
ASSERT (fgetc (f) == buf[2]);
ASSERT (fclose (f) == 0);
errno = 0;
ASSERT (lseek (fd2, 0, SEEK_CUR) == -1);
ASSERT (errno == EBADF);
ASSERT (lseek (fd, 0, SEEK_CUR) == 3);
/* Test that fclose() sets errno if someone else closes the stream
fd behind the back of stdio. */
{
FILE *fp = fdopen (fd, "w+");
ASSERT (fp != NULL);
ASSERT (close (fd) == 0);
errno = 0;
ASSERT (fclose (fp) == EOF);
ASSERT (errno == EBADF);
}
/* Test that fclose() sets errno if the stream was constructed with
an invalid file descriptor. */
{
FILE *fp = fdopen (-1, "r");
if (fp != NULL)
{
errno = 0;
ASSERT (fclose (fp) == EOF);
ASSERT (errno == EBADF);
}
}
{
FILE *fp;
close (99);
fp = fdopen (99, "r");
if (fp != NULL)
{
errno = 0;
ASSERT (fclose (fp) == EOF);
ASSERT (errno == EBADF);
}
}
/* Clean up. */
ASSERT (remove (BASE) == 0);
return 0;
}
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