tests-m32/signal.c

/*
 * Check decoding of signal syscall.
 *
 * 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>

#ifdef __NR_signal

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

static long
k_signal(const kernel_ulong_t signum, const kernel_ulong_t handler)
{
	return syscall(__NR_signal, signum, handler);
}

int
main(void)
{
	static const uintptr_t sig_ign = (uintptr_t) SIG_IGN;
	static const uintptr_t sig_dfl = (uintptr_t) SIG_DFL;
	static const kernel_ulong_t sigusr1 =
		(kernel_ulong_t) 0xfacefeed00000000ULL | SIGUSR1;
	static const struct sigaction act = { .sa_handler = SIG_DFL };
	long rc;

	sigset_t mask;
	sigemptyset(&mask);
	sigaddset(&mask, SIGUSR1);
	if (sigprocmask(SIG_BLOCK, &mask, NULL))
		perror_msg_and_fail("sigprocmask SIG_BLOCK");

	if (sigaction(SIGUSR1, &act, NULL))
		perror_msg_and_fail("sigaction");

	rc = k_signal(sigusr1, sig_ign);

	if (rc == -1L) {
		printf("signal(SIGUSR1, SIG_IGN) = %s\n", sprintrc(rc));
	} else if (rc != (long) sig_dfl) {
		error_msg_and_fail("signal(SIGUSR1, SIG_IGN) = %#lx\n", rc);
	} else {
		printf("signal(SIGUSR1, SIG_IGN) = %#lx (SIG_DFL)\n", rc);

		/*
		 * Raise and unblock SIGUSR1.
		 * If signal syscall failed to set SIGUSR1 handler to SIG_IGN,
		 * the process will be terminated by SIGUSR1.
		 */
		raise(SIGUSR1);
		if (sigprocmask(SIG_UNBLOCK, &mask, NULL))
			perror_msg_and_fail("sigprocmask SIG_UNBLOCK");

		if (sigprocmask(SIG_BLOCK, &mask, NULL))
			perror_msg_and_fail("sigprocmask SIG_BLOCK");
	}

	rc = k_signal(SIGUSR1, sig_dfl);

	if (rc == -1L) {
		printf("signal(SIGUSR1, SIG_DFL) = %s\n", sprintrc(rc));
	} else if (rc != (long) sig_ign) {
		error_msg_and_fail("signal(SIGUSR1, SIG_DFL) = %#lx\n", rc);
	} else {
		printf("signal(SIGUSR1, SIG_DFL) = %#lx (SIG_IGN)\n", rc);
	}

	const kernel_ulong_t addr = (kernel_ulong_t) 0xfacefeeddeadbeefULL;
	rc = k_signal(SIGUSR1, addr);

	if (rc == -1L) {
		printf("signal(SIGUSR1, %#llx) = %s\n",
		       (unsigned long long) addr, sprintrc(rc));
	} else if (rc != (long) sig_dfl) {
		error_msg_and_fail("signal(SIGUSR1, %#llx) = %#lx\n",
				   (unsigned long long) addr, rc);
	} else {
		printf("signal(SIGUSR1, %#llx) = %#lx (SIG_DFL)\n",
		       (unsigned long long) addr, rc);
	}

	rc = k_signal(SIGUSR1, sig_ign);

	if (rc == -1L) {
		printf("signal(SIGUSR1, SIG_IGN) = %s\n", sprintrc(rc));
	} else {
		printf("signal(SIGUSR1, SIG_IGN) = %#lx\n", rc);
	}

	rc = k_signal(addr, sig_ign);
	printf("signal(%d, SIG_IGN) = %s\n", (int) addr, sprintrc(rc));

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

#else

SKIP_MAIN_UNDEFINED("__NR_signal")

#endif