/*
 * Copyright (c) 2015 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.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <stdio.h>
#include <stdint.h>
#include <signal.h>
#include <time.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/syscall.h>

static void
handler(int signo)
{
}

int
main(void)
{
	struct {
		struct timespec ts;
		uint32_t pad[2];
	} req = {
		.ts = { .tv_nsec = 0xc0de1 },
		.pad = { 0xdeadbeef, 0xbadc0ded }
	}, rem = {
		.ts = { .tv_sec = 0xc0de2, .tv_nsec = 0xc0de3 },
		.pad = { 0xdeadbeef, 0xbadc0ded }
	};
	const sigset_t set = {};
	const struct sigaction act = { .sa_handler = handler };
	const struct itimerval itv = {
		.it_interval.tv_usec = 222222,
		.it_value.tv_usec = 111111
	};

	if (syscall(__NR_clock_nanosleep, CLOCK_REALTIME, 0, &req.ts, NULL))
		return 77;
	printf("clock_nanosleep(CLOCK_REALTIME, 0, {%jd, %jd}, NULL) = 0\n",
	       (intmax_t) req.ts.tv_sec, (intmax_t) req.ts.tv_nsec);

	if (!syscall(__NR_clock_nanosleep, CLOCK_REALTIME, 0, NULL, &rem.ts))
		return 77;
	printf("clock_nanosleep(CLOCK_REALTIME, 0, NULL, %p)"
	       " = -1 EFAULT (Bad address)\n", &rem.ts);

	if (syscall(__NR_clock_nanosleep, CLOCK_REALTIME, 0, &req.ts, &rem.ts))
		return 77;
	printf("clock_nanosleep(CLOCK_REALTIME, 0, {%jd, %jd}, %p) = 0\n",
	       (intmax_t) req.ts.tv_sec, (intmax_t) req.ts.tv_nsec, &rem.ts);

	req.ts.tv_nsec = 999999999 + 1;
	if (!syscall(__NR_clock_nanosleep, CLOCK_MONOTONIC, 0, &req.ts, &rem.ts))
		return 77;
	printf("clock_nanosleep(CLOCK_MONOTONIC, 0"
	       ", {%jd, %jd}, %p) = -1 EINVAL (Invalid argument)\n",
	       (intmax_t) req.ts.tv_sec, (intmax_t) req.ts.tv_nsec, &rem.ts);

	if (sigaction(SIGALRM, &act, NULL))
		return 77;
	if (sigprocmask(SIG_SETMASK, &set, NULL))
		return 77;

	if (setitimer(ITIMER_REAL, &itv, NULL))
		return 77;
	printf("setitimer(ITIMER_REAL, {it_interval={%jd, %jd}"
	       ", it_value={%jd, %jd}}, NULL) = 0\n",
	       (intmax_t) itv.it_interval.tv_sec,
	       (intmax_t) itv.it_interval.tv_usec,
	       (intmax_t) itv.it_value.tv_sec,
	       (intmax_t) itv.it_value.tv_usec);

	--req.ts.tv_nsec;
	if (!syscall(__NR_clock_nanosleep, CLOCK_REALTIME, 0, &req.ts, &rem.ts))
		return 77;
	printf("clock_nanosleep(CLOCK_REALTIME, 0, {%jd, %jd}, {%jd, %jd})"
	       " = ? ERESTART_RESTARTBLOCK (Interrupted by signal)\n",
	       (intmax_t) req.ts.tv_sec, (intmax_t) req.ts.tv_nsec,
	       (intmax_t) rem.ts.tv_sec, (intmax_t) rem.ts.tv_nsec);
	puts("--- SIGALRM {si_signo=SIGALRM, si_code=SI_KERNEL} ---");

	if (syscall(__NR_clock_gettime, CLOCK_REALTIME, &req.ts))
		return 77;
	printf("clock_gettime(CLOCK_REALTIME, {%jd, %jd}) = 0\n",
	       (intmax_t) req.ts.tv_sec, (intmax_t) req.ts.tv_nsec);

	++req.ts.tv_sec;
	rem.ts.tv_sec = 0xc0de4;
	rem.ts.tv_nsec = 0xc0de5;
	if (!syscall(__NR_clock_nanosleep, CLOCK_REALTIME, TIMER_ABSTIME,
		     &req.ts, &rem.ts))
		return 77;
	printf("clock_nanosleep(CLOCK_REALTIME, TIMER_ABSTIME, {%jd, %jd}, %p)"
	       " = ? ERESTARTNOHAND (To be restarted if no handler)\n",
	       (intmax_t) req.ts.tv_sec, (intmax_t) req.ts.tv_nsec, &rem.ts);
	puts("--- SIGALRM {si_signo=SIGALRM, si_code=SI_KERNEL} ---");

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