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/* Basic tests for getitimer and setitimer.
Copyright (C) 2021-2025 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/>. */
#include <array_length.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/time.h>
#include <support/check.h>
#include <support/support.h>
#include <support/xsignal.h>
#include <unistd.h>
#include <time.h>
static sig_atomic_t cnt;
static void
alrm_handler (int sig)
{
if (++cnt > 3)
cnt = 3;
}
static void
intr_sleep (int sec)
{
struct timespec ts = { .tv_sec = sec, .tv_nsec = 0 };
while (nanosleep (&ts, &ts) == -1 && errno == EINTR)
;
}
static int
do_test (void)
{
struct itimerval it, it_old;
const int timers[] = { ITIMER_REAL, ITIMER_VIRTUAL, ITIMER_PROF };
for (int i = 0; i < array_length (timers); i++)
{
TEST_COMPARE (getitimer (timers[i], &it), 0);
/* No timer set, all value should be 0. */
TEST_COMPARE (it.it_interval.tv_sec, 0);
TEST_COMPARE (it.it_interval.tv_usec, 0);
TEST_COMPARE (it.it_value.tv_sec, 0);
TEST_COMPARE (it.it_value.tv_usec, 0);
it.it_interval.tv_sec = 10;
it.it_interval.tv_usec = 20;
TEST_COMPARE (setitimer (timers[i], &it, NULL), 0);
TEST_COMPARE (setitimer (timers[i], &(struct itimerval) { }, &it_old),
0);
/* ITIMER_REAL returns { 0, 0 } for single-shot timers, while
other timers returns setitimer value. */
if (timers[i] == ITIMER_REAL)
{
TEST_COMPARE (it_old.it_interval.tv_sec, 0);
TEST_COMPARE (it_old.it_interval.tv_usec, 0);
}
else
{
TEST_COMPARE (it_old.it_interval.tv_sec, 10);
/* Some systems might use a different precision for ITIMER_VIRTUAL
and ITIMER_IPROF and thus the value might be adjusted. To avoid
trying to guess the resolution, we do not check it. */
}
/* Create a periodic timer and check if the return value is the one
previously set. */
it.it_interval.tv_sec = 10;
it.it_interval.tv_usec = 20;
it.it_value.tv_sec = 30;
it.it_value.tv_usec = 40;
TEST_COMPARE (setitimer (timers[i], &it, NULL), 0);
TEST_COMPARE (setitimer (timers[i], &(struct itimerval) { }, &it_old),
0);
TEST_COMPARE (it.it_interval.tv_sec, it_old.it_interval.tv_sec);
if (timers[i] == ITIMER_REAL)
TEST_COMPARE (it.it_interval.tv_usec, it_old.it_interval.tv_usec);
if (sizeof (time_t) == 4)
continue;
/* Same as before, but with a 64 bit time_t value. */
it.it_interval.tv_sec = (time_t) 0x1ffffffffull;
it.it_interval.tv_usec = 20;
it.it_value.tv_sec = 0;
it.it_value.tv_usec = 0;
/* Linux does not provide 64 bit time_t support for getitimer and
setitimer on architectures with 32 bit time_t support. */
if (support_itimer_support_time64())
{
TEST_COMPARE (setitimer (timers[i], &it, NULL), 0);
TEST_COMPARE (setitimer (timers[i], &(struct itimerval) { },
&it_old),
0);
/* ITIMER_REAL returns { 0, 0 } for single-sort timers, while other
timers returns setitimer value. */
if (timers[i] == ITIMER_REAL)
{
TEST_COMPARE (it_old.it_interval.tv_sec, 0ull);
TEST_COMPARE (it_old.it_interval.tv_usec, 0);
}
}
else
{
TEST_COMPARE (setitimer (timers[i], &it, NULL), -1);
TEST_COMPARE (errno, EOVERFLOW);
}
/* Create a periodic timer and check if the return value is the one
previously set. */
it.it_interval.tv_sec = (time_t) 0x1ffffffffull;
it.it_interval.tv_usec = 20;
it.it_value.tv_sec = 30;
it.it_value.tv_usec = 40;
if (support_itimer_support_time64())
{
TEST_COMPARE (setitimer (timers[i], &it, NULL), 0);
TEST_COMPARE (setitimer (timers[i], &(struct itimerval) { },
&it_old),
0);
if (timers[i] == ITIMER_REAL)
{
TEST_COMPARE (it.it_interval.tv_sec, it_old.it_interval.tv_sec);
TEST_COMPARE (it.it_interval.tv_usec, it_old.it_interval.tv_usec);
}
}
else
{
TEST_COMPARE (setitimer (timers[i], &it, NULL), -1);
TEST_COMPARE (errno, EOVERFLOW);
}
}
{
struct sigaction sa = { .sa_handler = alrm_handler, .sa_flags = 0 };
sigemptyset (&sa.sa_mask);
xsigaction (SIGALRM, &sa, NULL);
}
/* Setup a timer to 0.1s and sleep for 1s and check to 3 signal handler
execution. */
it.it_interval.tv_sec = 0;
it.it_interval.tv_usec = 100000;
it.it_value.tv_sec = 0;
it.it_value.tv_usec = 100000;
/* Check ITIMER_VIRTUAL and ITIMER_PROF would require to generate load
and be subject to system load. */
cnt = 0;
TEST_COMPARE (setitimer (ITIMER_REAL, &it, NULL), 0);
intr_sleep (1);
TEST_COMPARE (cnt, 3);
TEST_COMPARE (setitimer (ITIMER_REAL, &(struct itimerval) { }, NULL), 0);
return 0;
}
#include <support/test-driver.c>
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