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/* Test of nanosleep() function.
Copyright (C) 2009-2023 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Eric Blake <ebb9@byu.net>, 2009. */
#include <config.h>
#include <time.h>
#include "signature.h"
SIGNATURE_CHECK (nanosleep, int, (struct timespec const *, struct timespec *));
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include "macros.h"
#if HAVE_DECL_ALARM
static void
handle_alarm (int sig)
{
if (sig != SIGALRM)
_exit (1);
}
#endif
int
main (void)
{
struct timespec ts;
/* Check that negative nanosecond values cause failure. */
ts.tv_sec = 1;
ts.tv_nsec = -1;
errno = 0;
ASSERT (nanosleep (&ts, NULL) == -1);
ASSERT (errno == EINVAL);
ts.tv_sec = 1000;
ts.tv_nsec = -1;
errno = 0;
ASSERT (nanosleep (&ts, NULL) == -1);
ASSERT (errno == EINVAL);
/* Check that too large nanosecond values cause failure. */
ts.tv_sec = 1000;
ts.tv_nsec = 1000000000;
errno = 0;
ASSERT (nanosleep (&ts, NULL) == -1);
ASSERT (errno == EINVAL);
/* Check successful call. */
ts.tv_sec = 0;
ts.tv_nsec = 1;
ASSERT (nanosleep (&ts, &ts) == 0);
/* Remaining time is only defined on EINTR failure; but on success,
it is typically either 0 or unchanged from input. At any rate,
it shouldn't be randomly changed to unrelated values. */
ASSERT (ts.tv_sec == 0);
ASSERT (ts.tv_nsec == 0 || ts.tv_nsec == 1);
ts.tv_nsec = 0;
ASSERT (nanosleep (&ts, NULL) == 0);
#if HAVE_DECL_ALARM
{
const time_t pentecost = 50 * 24 * 60 * 60; /* 50 days. */
signal (SIGALRM, handle_alarm);
alarm (1);
ts.tv_sec = pentecost;
ts.tv_nsec = 999999999;
errno = 0;
ASSERT (nanosleep (&ts, &ts) == -1);
ASSERT (errno == EINTR);
ASSERT (pentecost - 10 < ts.tv_sec && ts.tv_sec <= pentecost);
ASSERT (0 <= ts.tv_nsec && ts.tv_nsec <= 999999999);
}
#endif
return 0;
}
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