minix/tests/kernel/kqueue/t_sig.c

/* $NetBSD: t_sig.c,v 1.2 2010/11/03 16:10:20 christos Exp $ */

/*-
 * Copyright (c) 2002, 2008 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Luke Mewburn and Jaromir Dolecek.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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 <sys/cdefs.h>
__COPYRIGHT("@(#) Copyright (c) 2008\
 The NetBSD Foundation, inc. All rights reserved.");
__RCSID("$NetBSD: t_sig.c,v 1.2 2010/11/03 16:10:20 christos Exp $");

#include <sys/event.h>
#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/wait.h>

#include <inttypes.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <atf-c.h>

#include "../../h_macros.h"

#define NSIGNALS 5

ATF_TC(sig);
ATF_TC_HEAD(sig, tc)
{
	atf_tc_set_md_var(tc, "descr", "Checks EVFILT_SIGNAL");
}
ATF_TC_BODY(sig, tc)
{
	struct timespec	timeout;
	struct kfilter_mapping km;
	struct kevent event[1];
	char namebuf[32];
	pid_t pid, child;
	int kq, n, num, status;

	pid = getpid();
	(void)printf("my pid: %d\n", pid);

	/* fork a child to send signals */
	RL(child = fork());
	if (child == 0) {
		int i;
		(void)sleep(2);
		for(i = 0; i < NSIGNALS; ++i) {
			(void)kill(pid, SIGUSR1);
			(void)sleep(2);
		}
		_exit(0);
		/* NOTREACHED */
	}

	RL(kq = kqueue());

	(void)strlcpy(namebuf, "EVFILT_SIGNAL", sizeof(namebuf));
	km.name = namebuf;
	RL(ioctl(kq, KFILTER_BYNAME, &km));
	(void)printf("got %d as filter number for `%s'.\n", km.filter, km.name);

	/* ignore the signal to avoid taking it for real */
	REQUIRE_LIBC(signal(SIGUSR1, SIG_IGN), SIG_ERR);

	event[0].ident = SIGUSR1;
	event[0].filter = km.filter;
	event[0].flags = EV_ADD | EV_ENABLE;

	RL(kevent(kq, event, 1, NULL, 0, NULL));

	(void)sleep(1);

	timeout.tv_sec = 1;
	timeout.tv_nsec = 0;

	for (num = 0; num < NSIGNALS; num += n) {
		struct timeval then, now, diff;

		RL(gettimeofday(&then, NULL));
		RL(n = kevent(kq, NULL, 0, event, 1, &timeout));
		RL(gettimeofday(&now, NULL));
		timersub(&now, &then, &diff);

		(void)printf("sig: kevent returned %d in %lld.%06ld\n",
		    n, (long long)diff.tv_sec, (long)diff.tv_usec);

		if (n == 0)
			continue;

		(void)printf("sig: kevent flags: 0x%x, data: %" PRId64 " (# "
		    "times signal posted)\n", event[0].flags, event[0].data);
	}

	(void)waitpid(child, &status, 0);
	(void)printf("sig: finished successfully\n");
}

ATF_TP_ADD_TCS(tp)
{
	ATF_TP_ADD_TC(tp, sig);

	return atf_no_error();
}