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/* Test for faccessat function.
Copyright (C) 2006-2025 Free Software Foundation, Inc.
Copyright The GNU Toolchain Authors.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <support/check.h>
#include <support/temp_file.h>
#include <support/test-driver.h>
#include <support/xdirent.h>
#include <support/xunistd.h>
static int dir_fd;
static void
prepare (int argc, char **argv)
{
dir_fd = xopen (support_create_temp_directory ("tst-faccessat."),
O_RDONLY | O_DIRECTORY, 0);
}
static int
do_test (void)
{
/* fdopendir takes over the descriptor, make a copy. */
int dupfd = xdup (dir_fd);
xlseek (dupfd, 0, SEEK_SET);
/* The directory should be empty save the . and .. files. */
DIR *dir = xfdopendir (dupfd);
struct dirent64 *d;
while ((d = xreaddir64 (dir)) != NULL)
if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0)
FAIL_EXIT1 ("temp directory contains file \"%s\"\n", d->d_name);
xclosedir (dir);
/* Try to create a file. */
int fd = openat (dir_fd, "some-file", O_CREAT|O_RDWR|O_EXCL, 0666);
if (fd == -1)
{
if (errno == ENOSYS)
FAIL_UNSUPPORTED ("*at functions not supported");
FAIL_EXIT1 ("file creation failed");
}
xwrite (fd, "hello", 5);
puts ("file created");
/* Before closing the file, try using this file descriptor to open
another file. This must fail. */
TEST_VERIFY_EXIT (faccessat (fd, "should-not-work", F_OK, AT_EACCESS) == -1);
TEST_VERIFY_EXIT (errno == ENOTDIR);
xclose (fd);
TEST_VERIFY (faccessat (dir_fd, "some-file", F_OK, AT_EACCESS) == 0);
TEST_VERIFY (faccessat (dir_fd, "some-file", W_OK, AT_EACCESS) == 0);
errno = 0;
if (faccessat (dir_fd, "some-file", X_OK, AT_EACCESS) != 0)
TEST_COMPARE (errno, EACCES);
else
FAIL ("faccessat unexpectedly succeeded\n");
if (fchmodat (dir_fd, "some-file", 0400, 0) != 0)
FAIL_EXIT1 ("fchownat failed: %m\n");
TEST_VERIFY (faccessat (dir_fd, "some-file", R_OK, AT_EACCESS) == 0);
/* Write would succeed only for EUID root, otherwise this test should
fail. */
errno = 0;
TEST_VERIFY (faccessat (dir_fd, "some-file", W_OK, AT_EACCESS) == 0
? (geteuid () == 0) : (errno == EACCES));
/* Create a file descriptor which is closed again right away. */
int dir_fd2 = xdup (dir_fd);
close (dir_fd2);
/* With the file descriptor closed the next call must fail. */
TEST_VERIFY_EXIT (faccessat (dir_fd2, "some-file", F_OK, AT_EACCESS)
== -1);
TEST_VERIFY_EXIT (errno == EBADF);
/* Same with a non-existing file. */
TEST_VERIFY_EXIT (faccessat (dir_fd2, "non-existing-file", F_OK, AT_EACCESS)
== -1);
TEST_VERIFY_EXIT (errno == EBADF);
TEST_VERIFY (unlinkat (dir_fd, "some-file", 0) == 0);
xclose (dir_fd);
TEST_VERIFY_EXIT (faccessat (-1, "some-file", F_OK, AT_EACCESS) == -1);
TEST_VERIFY_EXIT (errno == EBADF);
return 0;
}
#define PREPARE prepare
#include <support/test-driver.c>
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