94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/* Test of nanosleep() function.
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Copyright (C) 2009-2025 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Eric Blake <ebb9@byu.net>, 2009. */
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#include <config.h>
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#include <time.h>
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#include "signature.h"
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SIGNATURE_CHECK (nanosleep, int, (struct timespec const *, struct timespec *));
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#include <errno.h>
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#include <signal.h>
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#include <unistd.h>
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#include "macros.h"
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#if HAVE_DECL_ALARM
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static void
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handle_alarm (int sig)
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{
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if (sig != SIGALRM)
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_exit (1);
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}
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#endif
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int
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main (void)
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{
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struct timespec ts;
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/* Check that negative nanosecond values cause failure. */
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ts.tv_sec = 1;
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ts.tv_nsec = -1;
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errno = 0;
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ASSERT (nanosleep (&ts, NULL) == -1);
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ASSERT (errno == EINVAL);
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ts.tv_sec = 1000;
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ts.tv_nsec = -1;
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errno = 0;
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ASSERT (nanosleep (&ts, NULL) == -1);
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ASSERT (errno == EINVAL);
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/* Check that too large nanosecond values cause failure. */
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ts.tv_sec = 1000;
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ts.tv_nsec = 1000000000;
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errno = 0;
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ASSERT (nanosleep (&ts, NULL) == -1);
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ASSERT (errno == EINVAL);
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/* Check successful call. */
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ts.tv_sec = 0;
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ts.tv_nsec = 1;
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ASSERT (nanosleep (&ts, &ts) == 0);
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/* Remaining time is only defined on EINTR failure; but on success,
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it is typically either 0 or unchanged from input. At any rate,
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it shouldn't be randomly changed to unrelated values. */
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ASSERT (ts.tv_sec == 0);
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ASSERT (ts.tv_nsec == 0 || ts.tv_nsec == 1);
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ts.tv_nsec = 0;
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ASSERT (nanosleep (&ts, NULL) == 0);
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#if HAVE_DECL_ALARM
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{
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const time_t pentecost = 50 * 24 * 60 * 60; /* 50 days. */
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signal (SIGALRM, handle_alarm);
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alarm (1);
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ts.tv_sec = pentecost;
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ts.tv_nsec = 999999999;
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errno = 0;
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ASSERT (nanosleep (&ts, &ts) == -1);
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ASSERT (errno == EINTR);
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ASSERT (pentecost - 10 < ts.tv_sec && ts.tv_sec <= pentecost);
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ASSERT (0 <= ts.tv_nsec && ts.tv_nsec <= 999999999);
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}
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#endif
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return test_exit_status;
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}
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