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sleep.c revision 1.18 
      1 /* $NetBSD: sleep.c,v 1.18 2001/11/12 14:55:53 christos 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 1.18 2001/11/12 14:55:53 christos Exp $");
     47 #endif
     48 #endif /* not lint */
     49 
     50 #include <ctype.h>
     51 #include <err.h>
     52 #include <locale.h>
     53 #include <math.h>
     54 #include <signal.h>
     55 #include <stdio.h>
     56 #include <stdlib.h>
     57 #include <time.h>
     58 #include <unistd.h>
     59 
     60 void alarmhandle(int);
     61 void usage(void);
     62 int main(int, char *[]);
     63 
     64 int
     65 main(int argc, char *argv[])
     66 {
     67 	char *arg, *temp;
     68 	double fval, ival, val;
     69 	struct timespec ntime;
     70 	int ch, fracflag;
     71 
     72 	setprogname(argv[0]);
     73 	(void)setlocale(LC_ALL, "");
     74 
     75 	(void)signal(SIGALRM, alarmhandle);
     76 
     77 	while ((ch = getopt(argc, argv, "")) != -1)
     78 		switch(ch) {
     79 		case '?':
     80 		default:
     81 			usage();
     82 		}
     83 	argc -= optind;
     84 	argv += optind;
     85 
     86 	if (argc != 1)
     87 		usage();
     88 
     89 	/*
     90 	 * Okay, why not just use atof for everything? Why bother
     91 	 * checking if there is a fraction in use? Because the old
     92 	 * sleep handled the full range of integers, that's why, and a
     93 	 * double can't handle a large long. This is fairly useless
     94 	 * given how large a number a double can hold on most
     95 	 * machines, but now we won't ever have trouble. If you want
     96 	 * 1000000000.9 seconds of sleep, well, that's your
     97 	 * problem. Why use an isdigit() check instead of checking for
     98 	 * a period? Because doing it this way means locales will be
     99 	 * handled transparently by the atof code.
    100 	 */
    101 	fracflag = 0;
    102 	arg = *argv;
    103 	for (temp = arg; *temp != '\0'; temp++)
    104 		if (!isdigit((unsigned char)*temp))
    105 			fracflag++;
    106 
    107 	if (fracflag) {
    108 		val = atof(arg);
    109 		if (val <= 0)
    110 			exit(0);
    111 		ival = floor(val);
    112 		fval = (1000000000 * (val-ival));
    113 		ntime.tv_sec = ival;
    114 		ntime.tv_nsec = fval;
    115 	}
    116 	else{
    117 		ntime.tv_sec = atol(arg);
    118 		if (ntime.tv_sec <= 0)
    119 			exit(0);
    120 		ntime.tv_nsec = 0;
    121 	}
    122 
    123 	if (nanosleep(&ntime, NULL) == -1)
    124 		err(1, "nanosleep failed");
    125 
    126 	exit(0);
    127 	/* NOTREACHED */
    128 }
    129 
    130 void
    131 usage(void)
    132 {
    133 	(void)fprintf(stderr, "usage: %s seconds\n", getprogname());
    134 	exit(1);
    135 	/* NOTREACHED */
    136 }
    137 
    138 /* ARGSUSED */
    139 void
    140 alarmhandle(int i)
    141 {
    142 	_exit(0);
    143 	/* NOTREACHED */
    144 }
    145