/* $NetBSD: t_nanosleep.c,v 1.1 2024/10/09 13:02:53 kre 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 1.1 2024/10/09 13:02:53 kre 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 whle 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();
}

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