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Commit	Line	Data
	1	/* $NetBSD: sleep.c,v 1.15 1998/07/28 11:41:58 mycroft Exp $ */
	2
	3	/*
	4	* Copyright (c) 1988, 1993, 1994
	5	* The Regents of the University of California. All rights reserved.
	6	*
	7	* Redistribution and use in source and binary forms, with or without
	8	* modification, are permitted provided that the following conditions
	9	* are met:
	10	* 1. Redistributions of source code must retain the above copyright
	11	* notice, this list of conditions and the following disclaimer.
	12	* 2. Redistributions in binary form must reproduce the above copyright
	13	* notice, this list of conditions and the following disclaimer in the
	14	* documentation and/or other materials provided with the distribution.
	15	* 3. All advertising materials mentioning features or use of this software
	16	* must display the following acknowledgement:
	17	* This product includes software developed by the University of
	18	* California, Berkeley and its contributors.
	19	* 4. Neither the name of the University nor the names of its contributors
	20	* may be used to endorse or promote products derived from this software
	21	* without specific prior written permission.
	22	*
	23	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	24	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	25	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	26	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	27	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	28	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	29	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	30	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	31	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	32	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	33	* SUCH DAMAGE.
	34	*/
	35
	36	#include <sys/cdefs.h>
	37	#ifndef lint
	38	__COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994\n\
	39	The Regents of the University of California. All rights reserved.\n");
	40	#endif /* not lint */
	41
	42	#ifndef lint
	43	#if 0
	44	static char sccsid[] = "@(#)sleep.c 8.3 (Berkeley) 4/2/94";
	45	#else
	46	__RCSID("$NetBSD: sleep.c,v 1.15 1998/07/28 11:41:58 mycroft Exp $");
	47	#endif
	48	#endif /* not lint */
	49
	50	#include <time.h>
	51	#include <ctype.h>
	52	#include <math.h>
	53	#include <signal.h>
	54	#include <stdio.h>
	55	#include <stdlib.h>
	56	#include <unistd.h>
	57	#include <locale.h>
	58
	59	void usage __P((void));
	60	void alarmhandle __P((int));
	61	int main __P((int, char *[]));
	62
	63	int
	64	main(argc, argv)
	65	int argc;
	66	char *argv[];
	67	{
	68	char arg, temp;
	69	double val, ival, fval;
	70	struct timespec ntime;
	71	int fracflag;
	72	int ch;
	73
	74	(void)setlocale(LC_ALL, "");
	75
	76	(void)signal(SIGALRM, alarmhandle);
	77
	78	while ((ch = getopt(argc, argv, "")) != -1)
	79	switch(ch) {
	80	case '?':
	81	default:
	82	usage();
	83	}
	84	argc -= optind;
	85	argv += optind;
	86
	87	if (argc != 1)
	88	usage();
	89
	90	/*
	91	* Okay, why not just use atof for everything? Why bother
	92	* checking if there is a fraction in use? Because the old
	93	* sleep handled the full range of integers, that's why, and a
	94	* double can't handle a large long. This is fairly useless
	95	* given how large a number a double can hold on most
	96	* machines, but now we won't ever have trouble. If you want
	97	* 1000000000.9 seconds of sleep, well, that's your
	98	* problem. Why use an isdigit() check instead of checking for
	99	* a period? Because doing it this way means locales will be
	100	* handled transparently by the atof code.
	101	*/
	102	fracflag = 0;
	103	arg = *argv;
	104	for (temp = arg; *temp != '\0'; temp++)
	105	if (!isdigit(*temp))
	106	fracflag++;
	107
	108	if (fracflag) {
	109	val = atof(arg);
	110	if (val <= 0)
	111	exit(0);
	112	ival = floor(val);
	113	fval = (1000000000 * (val-ival));
	114	ntime.tv_sec = ival;
	115	ntime.tv_nsec = fval;
	116	}
	117	else{
	118	ntime.tv_sec = atol(arg);
	119	if (ntime.tv_sec <= 0)
	120	exit(0);
	121	ntime.tv_nsec = 0;
	122	}
	123
	124	(void)nanosleep(&ntime, NULL);
	125
	126	exit(0);
	127	/* NOTREACHED */
	128	}
	129
	130	void
	131	usage()
	132	{
	133	(void)fputs("usage: sleep seconds\n", stderr);
	134	exit(1);
	135	/* NOTREACHED */
	136	}
	137
	138	/* ARGSUSED */
	139	void
	140	alarmhandle(i)
	141	int i;
	142	{
	143	_exit(0);
	144	/* NOTREACHED */
	145	}