strace/tests/sxetmask.c

/*
 * Check decoding of sgetmask and ssetmask syscalls.
 *
 * Copyright (c) 2017 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 <asm/unistd.h>

#if defined __NR_sgetmask && defined __NR_ssetmask

# include <errno.h>
# include <signal.h>
# include <stdio.h>
# include <stdint.h>
# include <string.h>
# include <unistd.h>

static long
k_sgetmask(void)
{
	return syscall(__NR_sgetmask);
}

static long
k_ssetmask(const kernel_ulong_t arg)
{
	return syscall(__NR_ssetmask, arg);
}

int
main(void)
{
	union {
		sigset_t libc_mask;
		unsigned long old_mask;
	} uset, uget;
	long rc;

	/*
	 * Block, reset, and raise SIGUSR1.
	 * If a subsequent ssetmask call fails to set the proper mask,
	 * the process will be terminated by SIGUSR1.
	 */
	sigemptyset(&uset.libc_mask);
	sigaddset(&uset.libc_mask, SIGUSR1);
	if (sigprocmask(SIG_SETMASK, &uset.libc_mask, NULL))
		perror_msg_and_fail("sigprocmask");
	if (signal(SIGUSR1, SIG_DFL) == SIG_ERR)
		perror_msg_and_fail("signal");
	raise(SIGUSR1);

	sigaddset(&uset.libc_mask, SIGUSR2);
	rc = k_ssetmask((kernel_ulong_t) 0xfacefeed00000000ULL | uset.old_mask);
	if (rc == -1L) {
		printf("ssetmask([USR1 USR2]) = %s\n", sprintrc(rc));
	} else {
		printf("ssetmask([USR1 USR2]) = %#lx (old mask [USR1])\n", rc);
		/*
		 * Use a regular sigprocmask call to check the value
		 * returned by the ssetmask call being tested.
		 */
		if (sigprocmask(SIG_SETMASK, NULL, &uget.libc_mask))
			perror_msg_and_fail("sigprocmask");
		if (uset.old_mask != uget.old_mask)
			error_msg_and_fail("sigprocmask returned %#lx"
					   " instead of %#lx",
					   uget.old_mask, uset.old_mask);
	}

	rc = k_sgetmask();
	if (rc == -1L) {
		printf("sgetmask() = %s\n", sprintrc(rc));
	} else {
		printf("sgetmask() = %#lx (mask [USR1 USR2])\n", rc);
		if (uget.old_mask != (unsigned long) rc)
			error_msg_and_fail("sigprocmask returned %#lx",
					   uget.old_mask);

		if (sizeof(long) > 4) {
			sigaddset(&uset.libc_mask, 32 + 27);
			if (sigprocmask(SIG_SETMASK, &uset.libc_mask, NULL))
				perror_msg_and_fail("sigprocmask");
			rc = k_sgetmask();
			printf("sgetmask() = %#lx"
			       " (mask [USR1 USR2 RT_27])\n", rc);
			if (uset.old_mask != (unsigned long) rc)
				error_msg_and_fail("sigprocmask set %#lx",
						   uset.old_mask);
		}
	}

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

#else

SKIP_MAIN_UNDEFINED("__NR_sgetmask && __NR_ssetmask")

#endif