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/* Test for clock_nanosleep parameter checks and sleep duration.
Copyright (C) 2024-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* This test has two primary goals - first, to validate that invalid
inputs to clock_nanosleep are caught, and second, to validate that
clock_nanosleep sleeps for at least the amount of time requested.
It is assumed that the system may sleep for an arbitrary additional
amount of time beyond the requested time. */
#include <unistd.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <support/xunistd.h>
#include <support/check.h>
#include <support/xthread.h>
#include <support/timespec.h>
/* This is 1 ms per test, we have 10 tests, so this file runs in on
the order of 0.01 seconds. */
#define TEST_NSEC 1000000
/* Nanoseconds per second. */
#define NSECMAX 1000000000L
static pthread_barrier_t barrier;
/* This function is intended to rack up both user and system time. */
static void *
chew_cpu (void *arg)
{
pthread_barrier_wait (&barrier);
while (1)
{
static volatile char buf[4096];
for (int i = 0; i < 100; ++i)
for (size_t j = 0; j < sizeof buf; ++j)
buf[j] = 0xaa;
int nullfd = xopen ("/dev/null", O_WRONLY, 0);
for (int i = 0; i < 100; ++i)
for (size_t j = 0; j < sizeof buf; ++j)
buf[j] = 0xbb;
xwrite (nullfd, (char *) buf, sizeof buf);
close (nullfd);
}
return NULL;
}
static void
ptime_1 (const char *n, struct timespec t)
{
/* This is only for debugging failed test cases. */
printf ("%12s: %lld.%09lld\n", n, (long long int) t.tv_sec,
(long long int) t.tv_nsec);
}
#define ptime(t) ptime_1 (#t, t)
static void
test_interval_1 (const char *n_clock, clockid_t t_clock)
{
struct timespec me_before, me_after, quantum, me_sleep, me_slept;
long long int slept, min_slept;
/* Arbitrary to ensure our time period is sufficiently bigger than
the time step. */
TEST_VERIFY (clock_getres (t_clock, &quantum) == 0);
printf("Clock quantum: %lld ns, test time: %lld ns\n",
(long long int) quantum.tv_nsec, (long long int) TEST_NSEC);
TEST_VERIFY (quantum.tv_nsec <= TEST_NSEC / 10);
min_slept = TEST_NSEC;
me_sleep = make_timespec (0, min_slept);
printf ("test clock %s for %lld.%09lld sec relative\n",
n_clock, (long long int) me_sleep.tv_sec,
(long long int) me_sleep.tv_nsec);
TEST_COMPARE (clock_gettime (t_clock, &me_before), 0);
TEST_COMPARE (clock_nanosleep (t_clock, 0, &me_sleep, NULL), 0);
TEST_COMPARE (clock_gettime (t_clock, &me_after), 0);
me_slept = timespec_sub (me_after, me_before);
slept = support_timespec_ns (me_slept);
ptime (me_before);
ptime (me_after);
ptime (me_sleep);
ptime (me_slept);
printf ("test slept %lld nsec >= asked for %lld ?\n", slept, min_slept);
/* This is the important part - verify that the time slept is at
least as much as the time requested. */
TEST_VERIFY (slept >= min_slept);
}
static void
test_abs_1 (const char *n_clock, clockid_t t_clock)
{
struct timespec me_before, me_after, quantum, me_sleep;
/* Arbitrary to ensure our time period is sufficiently bigger than
the time step. */
TEST_VERIFY (clock_getres (t_clock, &quantum) == 0);
printf("Clock quantum: %lld ns, test time: %lld ns\n",
(long long int) quantum.tv_nsec, (long long int) TEST_NSEC);
TEST_VERIFY (quantum.tv_nsec <= TEST_NSEC / 10);
me_sleep = make_timespec (0, TEST_NSEC);
printf ("test clock %s for %lld.%09lld sec absolute\n",
n_clock, (long long int) me_sleep.tv_sec,
(long long int) me_sleep.tv_nsec);
TEST_COMPARE (clock_gettime (t_clock, &me_before), 0);
me_sleep = timespec_add (me_sleep, me_before);
TEST_COMPARE (clock_nanosleep (t_clock, TIMER_ABSTIME, &me_sleep, NULL), 0);
TEST_COMPARE (clock_gettime (t_clock, &me_after), 0);
ptime (me_before);
ptime (me_sleep);
ptime (me_after);
printf("test slept until %lld.%09lld after requested %lld.%09lld ?\n",
(long long int) me_after.tv_sec, (long long int) me_after.tv_nsec,
(long long int) me_sleep.tv_sec, (long long int) me_sleep.tv_nsec);
/* This is the important part - verify that the time slept is at
least as much as the time requested. */
TEST_TIMESPEC_EQUAL_OR_AFTER (me_after, me_sleep);
}
static void
test_invalids_1 (const char *the_clock_name, int the_clock,
const char *flags_name, int flags)
{
struct timespec me_before;
/* Note: do not use make_timespec() in case that function tries to
normalize the fields. */
printf ("%s: %s: test tv 0, 0\n", the_clock_name, flags_name);
me_before.tv_sec = 0;
me_before.tv_nsec = 0;
TEST_COMPARE (clock_nanosleep (the_clock, 0, &me_before, NULL), 0);
printf ("%s: %s: test tv -1, 0\n", the_clock_name, flags_name);
me_before.tv_sec = -1;
me_before.tv_nsec = 0;
TEST_COMPARE (clock_nanosleep (the_clock, 0, &me_before, NULL), EINVAL);
printf ("%s: %s: test tv 0, -1\n", the_clock_name, flags_name);
me_before.tv_sec = 0;
me_before.tv_nsec = -1;
TEST_COMPARE (clock_nanosleep (the_clock, 0, &me_before, NULL), EINVAL);
printf ("%s: %s: test tv -1, -1\n", the_clock_name, flags_name);
me_before.tv_sec = -1;
me_before.tv_nsec = -1;
TEST_COMPARE (clock_nanosleep (the_clock, 0, &me_before, NULL), EINVAL);
printf ("%s: %s: test tv 0, MAX\n", the_clock_name, flags_name);
me_before.tv_sec = 0;
me_before.tv_nsec = NSECMAX;
TEST_COMPARE (clock_nanosleep (the_clock, 0, &me_before, NULL), EINVAL);
}
static int
do_test (void)
{
pthread_t th;
pthread_barrier_init (&barrier, NULL, 2);
/* Test for proper error detection. */
#define test_invalids(c, f) test_invalids_1 (#c, c, #f, f)
test_invalids (CLOCK_REALTIME, 0);
#ifdef CLOCK_TAI
test_invalids (CLOCK_TAI, 0);
#endif
test_invalids (CLOCK_MONOTONIC, 0);
#ifdef CLOCK_BOOTTIME
test_invalids (CLOCK_BOOTTIME, 0);
#endif
test_invalids (CLOCK_PROCESS_CPUTIME_ID, 0);
test_invalids (CLOCK_REALTIME, TIMER_ABSTIME);
#ifdef CLOCK_TAI
test_invalids (CLOCK_TAI, TIMER_ABSTIME);
#endif
test_invalids (CLOCK_MONOTONIC, TIMER_ABSTIME);
#ifdef CLOCK_BOOTTIME
test_invalids (CLOCK_BOOTTIME, TIMER_ABSTIME);
#endif
test_invalids (CLOCK_PROCESS_CPUTIME_ID, TIMER_ABSTIME);
/* Test for various clocks "working". */
#define test_interval(c) test_interval_1 (#c, c)
test_interval (CLOCK_REALTIME);
#ifdef CLOCK_TAI
test_interval (CLOCK_TAI);
#endif
test_interval (CLOCK_MONOTONIC);
#ifdef CLOCK_BOOTTIME
test_interval (CLOCK_BOOTTIME);
#endif
th = xpthread_create (NULL, chew_cpu, NULL);
xpthread_barrier_wait (&barrier);
test_interval (CLOCK_PROCESS_CPUTIME_ID);
xpthread_cancel (th);
#define test_abs(c) test_abs_1 (#c, c)
test_abs (CLOCK_REALTIME);
#ifdef CLOCK_TAI
test_abs (CLOCK_TAI);
#endif
test_abs (CLOCK_MONOTONIC);
#ifdef CLOCK_BOOTTIME
test_abs (CLOCK_BOOTTIME);
#endif
th = xpthread_create (NULL, chew_cpu, NULL);
xpthread_barrier_wait (&barrier);
test_abs (CLOCK_PROCESS_CPUTIME_ID);
xpthread_cancel (th);
return 0;
}
#include <support/test-driver.c>
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