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/* Test changing to a directory named by a file descriptor.
Copyright (C) 2009-2024 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 <unistd.h>
#include "signature.h"
SIGNATURE_CHECK (fchdir, int, (int));
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include "cloexec.h"
#include "macros.h"
int
main (void)
{
char *cwd;
int fd;
int i;
cwd = getcwd (NULL, 0);
ASSERT (cwd);
fd = open (".", O_RDONLY);
ASSERT (0 <= fd);
/* Test behaviour for invalid file descriptors. */
{
errno = 0;
ASSERT (fchdir (-1) == -1);
ASSERT (errno == EBADF);
}
{
close (99);
errno = 0;
ASSERT (fchdir (99) == -1);
ASSERT (errno == EBADF);
}
#ifdef FD_ATCWD
{
errno = 0;
ASSERT (fchdir (FD_ATCWD) == -1);
ASSERT (errno == EBADF);
}
#endif
/* Check for other failure cases. */
{
int bad_fd = open ("/dev/null", O_RDONLY);
ASSERT (0 <= bad_fd);
errno = 0;
ASSERT (fchdir (bad_fd) == -1);
ASSERT (errno == ENOTDIR);
ASSERT (close (bad_fd) == 0);
}
/* Repeat test twice, once in '.' and once in '..'. */
for (i = 0; i < 2; i++)
{
ASSERT (chdir (&".."[1 - i]) == 0);
ASSERT (fchdir (fd) == 0);
{
size_t len = strlen (cwd) + 1;
char *new_dir = malloc (len);
ASSERT (new_dir);
ASSERT (getcwd (new_dir, len) == new_dir);
ASSERT (strcmp (cwd, new_dir) == 0);
free (new_dir);
}
/* For second iteration, use a cloned fd, to ensure that dup
remembers whether an fd was associated with a directory. */
if (!i)
{
int new_fd = dup (fd);
ASSERT (0 <= new_fd);
ASSERT (close (fd) == 0);
ASSERT (dup2 (new_fd, fd) == fd);
ASSERT (close (new_fd) == 0);
ASSERT (dup_cloexec (fd) == new_fd);
ASSERT (dup2 (new_fd, fd) == fd);
ASSERT (close (new_fd) == 0);
ASSERT (fcntl (fd, F_DUPFD_CLOEXEC, new_fd) == new_fd);
ASSERT (close (fd) == 0);
ASSERT (fcntl (new_fd, F_DUPFD, fd) == fd);
ASSERT (close (new_fd) == 0);
#if GNULIB_TEST_DUP3
ASSERT (dup3 (fd, new_fd, 0) == new_fd);
ASSERT (dup3 (new_fd, fd, 0) == fd);
ASSERT (close (new_fd) == 0);
#endif
}
}
free (cwd);
return test_exit_status;
}
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