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/* Test that directory streams leave standard fds alone.
Copyright (C) 2009-2022 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 Eric Blake <ebb9@byu.net>, 2009. */
#include <config.h>
#include "dirent--.h"
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#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)
{
int i;
DIR *dp;
/* The dirent-safer module works without the use of fdopendir (which
would also pull in fchdir and openat); but if those modules were
also used, we ensure that they are safe. In particular, the
gnulib version of fdopendir is unable to guarantee that
dirfd(fdopendir(fd))==fd, but we can at least guarantee that if
they are not equal, the fd returned by dirfd is safe. */
#if HAVE_FDOPENDIR || GNULIB_TEST_FDOPENDIR
int dfd;
#endif
/* 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;
#if HAVE_FDOPENDIR || GNULIB_TEST_FDOPENDIR
dfd = open (".", O_RDONLY);
ASSERT (STDERR_FILENO < dfd);
#endif
/* Four iterations, with progressively more standard descriptors
closed. */
for (i = -1; i <= STDERR_FILENO; i++)
{
if (0 <= i)
ASSERT (close (i) == 0);
dp = opendir (".");
ASSERT (dp);
ASSERT (dirfd (dp) == -1 || STDERR_FILENO < dirfd (dp));
ASSERT (closedir (dp) == 0);
#if HAVE_FDOPENDIR || GNULIB_TEST_FDOPENDIR
{
int fd = fcntl (dfd, F_DUPFD_CLOEXEC, STDERR_FILENO + 1);
ASSERT (STDERR_FILENO < fd);
dp = fdopendir (fd);
ASSERT (dp);
ASSERT (dirfd (dp) == -1 || STDERR_FILENO < dirfd (dp));
ASSERT (closedir (dp) == 0);
errno = 0;
ASSERT (close (fd) == -1);
ASSERT (errno == EBADF);
}
#endif
}
#if HAVE_FDOPENDIR || GNULIB_TEST_FDOPENDIR
ASSERT (close (dfd) == 0);
#endif
return 0;
}
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