Few basic tests for nanosleep(2).


(jruoho)

/* $NetBSD: t_nanosleep.c,v 1.1 2011/05/01 09:09:35 jruoho Exp $ */

/*-
 * Copyright (c) 2011 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jukka Ruohonen.
 *
 * 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>
__RCSID("$NetBSD: t_nanosleep.c,v 1.1 2011/05/01 09:09:35 jruoho Exp $");

#include <sys/time.h>
#include <sys/wait.h>

#include <atf-c.h>
#include <errno.h>
#include <time.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>

static void
handler(int signo)
{
	/* Nothing. */
}

ATF_TC(nanosleep_basic);
ATF_TC_HEAD(nanosleep_basic, tc)
{
	atf_tc_set_md_var(tc, "descr", "Test that nanosleep(2) works");
}

ATF_TC_BODY(nanosleep_basic, tc)
{
	static const size_t maxiter = 1; /* XXX */
	struct timespec ts1, ts2, tsn;
	pid_t pid;
	size_t i;
	int sta;

	/*
	 * Fork a child, suspend the execution of it,
	 * and verify that it was actually suspended.
	 */
	for (i = 0; i < maxiter; i++) {

		pid = fork();
		ATF_REQUIRE(pid >= 0);

		if (pid == 0) {

			tsn.tv_sec = 1;
			tsn.tv_nsec = i * 10000;

			(void)memset(&ts1, 0, sizeof(struct timespec));
			(void)memset(&ts2, 0, sizeof(struct timespec));

			if (clock_gettime(CLOCK_MONOTONIC, &ts1) != 0)
				_exit(EX_OSERR);

			if (nanosleep(&tsn, NULL) != 0)
				_exit(EX_OSERR);

			if (clock_gettime(CLOCK_MONOTONIC, &ts2) != 0)
				_exit(EX_OSERR);

			(void)fprintf(stderr,
			    "tsn: sec = %lu, nsec = %lu\n\t"
			    "ts1: sec = %lu, nsec = %lu\n\t"
			    "ts2: sec = %lu, nsec = %lu\n",
			    tsn.tv_sec, tsn.tv_nsec,
			    ts1.tv_sec, ts1.tv_nsec,
			    ts2.tv_sec, ts2.tv_nsec);

			/*
			 * Assume accuracy of the resolution in seconds.
			 */
			if (ts2.tv_sec - tsn.tv_sec != ts1.tv_sec)
				_exit(EX_DATAERR);

			if (ts2.tv_nsec - tsn.tv_nsec < ts1.tv_nsec)
				_exit(EX_DATAERR);

			_exit(EXIT_SUCCESS);
		}

		(void)wait(&sta);

		if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) {

			if (WEXITSTATUS(sta) == EX_DATAERR)
				atf_tc_fail("inaccuracies in sleep time");

			atf_tc_fail("system call failed");
		}
	}
}

ATF_TC(nanosleep_err);
ATF_TC_HEAD(nanosleep_err, tc)
{
	atf_tc_set_md_var(tc, "descr", "Test errors from nanosleep(2)");
}

ATF_TC_BODY(nanosleep_err, tc)
{
	struct timespec ts;

	ts.tv_sec = -1;
	ts.tv_nsec = 1000;

	errno = 0;
	ATF_REQUIRE_ERRNO(EINVAL, nanosleep(&ts, NULL) == -1);

	errno = 0;
	ATF_REQUIRE_ERRNO(EFAULT, nanosleep((void *)-1, NULL) == -1);
}

ATF_TC(nanosleep_sig);
ATF_TC_HEAD(nanosleep_sig, tc)
{
	atf_tc_set_md_var(tc, "descr", "Test signal for nanosleep(2)");
}

ATF_TC_BODY(nanosleep_sig, tc)
{
	struct timespec tsn, tsr;
	pid_t pid;
	int sta;

	/*
	 * Test that a signal interrupts nanosleep(2).
	 *
	 * (In which case the return value should be -1 and the
	 * second parameter should contain the unslept time.)
	 */
	pid = fork();

	ATF_REQUIRE(pid >= 0);
	ATF_REQUIRE(signal(SIGINT, handler) == 0);

	if (pid == 0) {

		tsn.tv_sec = 10;
		tsn.tv_nsec = 0;

		tsr.tv_sec = 0;
		tsr.tv_nsec = 0;

		errno = 0;

		if (nanosleep(&tsn, &tsr) != -1)
			_exit(EXIT_FAILURE);

		if (errno != EINTR)
			_exit(EXIT_FAILURE);

		if (tsr.tv_sec == 0 && tsr.tv_nsec == 0)
			_exit(EXIT_FAILURE);

		_exit(EXIT_SUCCESS);
	}

	(void)sleep(1);
	(void)kill(pid, SIGINT);
	(void)wait(&sta);

	if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS)
		atf_tc_fail("signal did not interrupt nanosleep(2)");
}

ATF_TP_ADD_TCS(tp)
{

	ATF_TP_ADD_TC(tp, nanosleep_basic);
	ATF_TP_ADD_TC(tp, nanosleep_err);
	ATF_TP_ADD_TC(tp, nanosleep_sig);

	return atf_no_error();
}