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sleep.c revision 1.14 
      1 /*	$NetBSD: sleep.c,v 1.14 1998/07/28 05:31:29 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 1.14 1998/07/28 05:31:29 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 			/* NOTREACHED */
    113 		}
    114 		ival = floor(val);
    115 		fval = (1000000000 * (val-ival));
    116 		ntime.tv_sec = ival;
    117 		ntime.tv_nsec = fval;
    118 	}
    119 	else{
    120 		ntime.tv_sec = atol(arg);
    121 		if (ntime.tv_sec <= 0) {
    122 			exit(0);
    123 			/* NOTREACHED */
    124 		}
    125 		ntime.tv_nsec = 0;
    126 	}
    127 
    128 	(void)nanosleep(&ntime, NULL);
    129 
    130 	exit(0);
    131 	/* NOTREACHED */
    132 }
    133 
    134 void
    135 usage()
    136 {
    137 	(void)fputs("usage: sleep seconds\n", stderr);
    138 	exit(1);
    139 	/* NOTREACHED */
    140 }
    141 
    142 /* ARGSUSED */
    143 void
    144 alarmhandle(i)
    145 	int i;
    146 {
    147 	_exit(0);
    148 	/* NOTREACHED */
    149 }
    150