tests/fchownat.c

/*
 * Check decoding of fchownat syscall.
 *
 * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "tests.h"
#include <sys/syscall.h>
#include <fcntl.h>

#if defined __NR_fchownat && defined AT_FDCWD && defined AT_SYMLINK_NOFOLLOW

# include <stdio.h>
# include <unistd.h>

int
main(void)
{
	static const char sample[] = "fchownat_sample";
	uid_t uid = geteuid();
	uid_t gid = getegid();

	if (open(sample, O_RDONLY | O_CREAT, 0400) == -1)
		perror_msg_and_fail("open");

	long rc = syscall(__NR_fchownat, AT_FDCWD, sample, uid, gid, 0);
	if (rc == 0) {
		printf("fchownat(AT_FDCWD, \"%s\", %d, %d, 0) = 0\n",
		       sample, uid, gid);

		if (unlink(sample))
			perror_msg_and_fail("unlink");

		rc = syscall(__NR_fchownat, AT_FDCWD,
			     sample, -1, -1L, AT_SYMLINK_NOFOLLOW);

		printf("fchownat(AT_FDCWD, \"%s\", -1, -1, AT_SYMLINK_NOFOLLOW)"
		       " = %ld %s (%m)\n", sample, rc, errno2name());
	} else {
		printf("fchownat(AT_FDCWD, \"%s\", %d, %d, 0)"
		       " = %ld %s (%m)\n", sample, uid, gid, rc, errno2name());
	}

	puts("+++ exited with 0 +++");
	return 0;
}

#else

SKIP_MAIN_UNDEFINED("__NR_fchownat && AT_FDCWD && AT_SYMLINK_NOFOLLOW")

#endif