/* $NetBSD: t_nanosleep.c,v 1.2 2025/10/07 20:09:27 andvar Exp $ */

/*-
 * Copyright (c) 2024 The NetBSD Foundation, Inc.
 * 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.
 *
 * 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) 2024\
 The NetBSD Foundation, inc. All rights reserved.");
__RCSID("$NetBSD: t_nanosleep.c,v 1.2 2025/10/07 20:09:27 andvar Exp $");

#include <sys/types.h>
#include <sys/wait.h>

#include <atf-c.h>

#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>

static void
sacrifice(void)
{
        pause();
}

static void
tester(pid_t victim, clockid_t clock, int flags)
{
        /*
         * we need this sleep to be long enough that we
         * can accurately detect when the sleep finishes
         * early, but not so long that when there's no
         * bug and things actually sleep this long, that
         * the execution of a sleep this long, several
         * times, won't slow down the overall testing
         * process too much.    Trial and error...
         */
        struct timespec to_sleep = { 4, 0 };

        struct timespec before, after;
        struct timespec *ts;
        int e;

        if (clock_gettime(clock, &before) != 0)
                exit(1);

        if (flags & TIMER_ABSTIME) {
                timespecadd(&to_sleep, &before, &after);
                ts = &after;
        } else
                ts = &to_sleep;

        printf("Test: Clock=%d Flags=%x, starting at %jd.%.9ld\n",
                (int)clock, flags, (intmax_t)before.tv_sec, before.tv_nsec);
        if (flags & TIMER_ABSTIME)
                printf("Sleeping until %jd.%.9ld\n",
                    (intmax_t)ts->tv_sec, ts->tv_nsec);
        else
                printf("Sleeping for %jd.%.9ld\n",
                    (intmax_t)ts->tv_sec, ts->tv_nsec);

        /* OK, we're ready */

        /* these next two steps need to be as close together as possible */
        if (kill(victim, SIGKILL) == -1)
                exit(2);
        if ((e = clock_nanosleep(clock, flags, ts, &after)) != 0)
                exit(20 + e);

        if (!(flags & TIMER_ABSTIME)) {
                printf("Remaining to sleep: %jd.%.9ld\n",
                    (intmax_t)after.tv_sec, after.tv_nsec);

                if (after.tv_sec != 0 || after.tv_nsec != 0)
                        exit(3);
        }

        if (clock_gettime(clock, &after) != 0)
                exit(4);

        printf("Sleep ended at: %jd.%.9ld\n",
                (intmax_t)after.tv_sec, after.tv_nsec);

        timespecadd(&before, &to_sleep, &before);
        if (timespeccmp(&before, &after, >))
                exit(5);

        exit(0);
}

/*
 * The parent of the masochist/victim above, controls everything.
 */
static void
runit(clockid_t clock, int flags)
{
        pid_t v, m, x;
        int status;
        struct timespec brief = { 0, 3 * 100 * 1000 * 1000 };  /* 300 ms */

        ATF_REQUIRE((v = fork()) != -1);
        if (v == 0)
                sacrifice();

        ATF_REQUIRE((m = fork()) != -1);
        if (m == 0)
                tester(v, clock, flags);

        ATF_REQUIRE((x = wait(&status)) != -1);

        if (x == m) {
                /*
                 * This is bad, the murderer shouldn't die first
                 */
                fprintf(stderr, "M exited first, status %#x\n", status);
                (void)kill(v, SIGKILL); /* just in case */
                atf_tc_fail("2nd child predeceased first");
        }
        if (x != v) {
                fprintf(stderr, "Unknown exit from %d (status: %#x)"
                    "(M=%d V=%d)\n", x, status, m, v);
                (void)kill(m, SIGKILL);
                (void)kill(v, SIGKILL);
                atf_tc_fail("Strange child died");
        }

        /*
         * OK, the victim died, we don't really care why,
         * (it should have been because of a SIGKILL, maybe
         * test for that someday).
         *
         * Now we get to proceed to the real test.
         *
         * But we want to wait a short while to try and be sure
         * that m (the child still running) has a chance to
         * fall asleep.
         */
        (void) clock_nanosleep(CLOCK_MONOTONIC, TIMER_RELTIME, &brief, NULL);

        /*
         * This is the test, for PR kern/58733
         *   -  stop a process while in clock_nanosleep()
         *   -  resume it again
         *   -  see if it still sleeps as long as was requested (or longer)
         */
        ATF_REQUIRE(kill(m, SIGSTOP) == 0);
        (void) clock_nanosleep(CLOCK_MONOTONIC, TIMER_RELTIME, &brief, NULL);
        ATF_REQUIRE(kill(m, SIGCONT) == 0);

        ATF_REQUIRE((x = wait(&status)) != -1);

        if (x != m) {
                fprintf(stderr, "Unknown exit from %d (status: %#x)"
                    "(M=%d V=%d)\n", x, status, m, v);
                (void) kill(m, SIGKILL);
                atf_tc_fail("Strange child died");
        }

        if (status == 0)
                atf_tc_pass();

        /*
         * Here we should decode the status, and give a better
         * clue what really went wrong.   Later...
         */
        fprintf(stderr, "Test failed: status from M: %#x\n", status);
        atf_tc_fail("M exited with non-zero status.  PR kern/58733");
}


ATF_TC(nanosleep_monotonic_absolute);
ATF_TC_HEAD(nanosleep_monotonic_absolute, tc)
{
        atf_tc_set_md_var(tc, "descr", "Checks clock_nanosleep(MONO, ABS)");
}
ATF_TC_BODY(nanosleep_monotonic_absolute, tc)
{
        runit(CLOCK_MONOTONIC, TIMER_ABSTIME);
}

ATF_TC(nanosleep_monotonic_relative);
ATF_TC_HEAD(nanosleep_monotonic_relative, tc)
{
        atf_tc_set_md_var(tc, "descr", "Checks clock_nanosleep(MONO, REL)");
}
ATF_TC_BODY(nanosleep_monotonic_relative, tc)
{
        runit(CLOCK_MONOTONIC, TIMER_RELTIME);
}

ATF_TC(nanosleep_realtime_absolute);
ATF_TC_HEAD(nanosleep_realtime_absolute, tc)
{
        atf_tc_set_md_var(tc, "descr", "Checks clock_nanosleep(REAL, ABS)");
}
ATF_TC_BODY(nanosleep_realtime_absolute, tc)
{
        runit(CLOCK_REALTIME, TIMER_ABSTIME);
}

ATF_TC(nanosleep_realtime_relative);
ATF_TC_HEAD(nanosleep_realtime_relative, tc)
{
        atf_tc_set_md_var(tc, "descr", "Checks clock_nanosleep(REAL, REL)");
}
ATF_TC_BODY(nanosleep_realtime_relative, tc)
{
        runit(CLOCK_REALTIME, TIMER_RELTIME);
}

ATF_TP_ADD_TCS(tp)
{

        ATF_TP_ADD_TC(tp, nanosleep_monotonic_absolute);
        ATF_TP_ADD_TC(tp, nanosleep_monotonic_relative);
        ATF_TP_ADD_TC(tp, nanosleep_realtime_absolute);
        ATF_TP_ADD_TC(tp, nanosleep_realtime_relative);

        return atf_no_error();
}