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/* Test opening a directory stream from a file descriptor.
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>
#include <dirent.h>
#include "signature.h"
SIGNATURE_CHECK (fdopendir, DIR *, (int));
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include "macros.h"
int
main (_GL_UNUSED int argc, char *argv[])
{
DIR *d;
int fd;
/* A non-directory cannot be turned into a directory stream. */
fd = open ("test-fdopendir.tmp", O_RDONLY | O_CREAT, 0600);
ASSERT (0 <= fd);
errno = 0;
ASSERT (fdopendir (fd) == NULL);
ASSERT (errno == ENOTDIR);
ASSERT (close (fd) == 0);
ASSERT (unlink ("test-fdopendir.tmp") == 0);
/* A bad fd cannot be turned into a stream. */
{
errno = 0;
ASSERT (fdopendir (-1) == NULL);
ASSERT (errno == EBADF);
}
{
close (99);
errno = 0;
ASSERT (fdopendir (99) == NULL);
ASSERT (errno == EBADF);
}
/* This should work. */
fd = open (".", O_RDONLY);
ASSERT (0 <= fd);
d = fdopendir (fd);
ASSERT (d);
/* fdopendir should not close fd. */
ASSERT (dup2 (fd, fd) == fd);
/* Don't test dirfd here. dirfd (d) must return fd on current POSIX
platforms, but on pre-2008 platforms or on non-POSIX platforms
dirfd (fd) might return some other descriptor, or -1, and gnulib
does not work around this porting problem. */
ASSERT (closedir (d) == 0);
/* Now we can guarantee that fd must be closed. */
errno = 0;
ASSERT (dup2 (fd, fd) == -1);
ASSERT (errno == EBADF);
return 0;
}
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