sleep/sleep.c

   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 #ifndef __APPLE__
  69         char *arg, *temp;
  70         double val, ival, fval;
  71         struct timespec ntime;
  72         int fracflag;
  73 #else
  74         int secs;
  75 #endif
  76         int ch;
  77
  78         (void)setlocale(LC_ALL, "");
  79
  80         (void)signal(SIGALRM, alarmhandle);
  81
  82         while ((ch = getopt(argc, argv, "")) != -1)
  83                 switch(ch) {
  84                 case '?':
  85                 default:
  86                         usage();
  87                 }
  88         argc -= optind;
  89         argv += optind;
  90
  91         if (argc != 1)
  92                 usage();
  93
  94 #ifdef __APPLE__
  95         if ((secs = atoi(*argv)) > 0)
  96                 (void)sleep(secs);
  97 #else
  98         /*
  99          * Okay, why not just use atof for everything? Why bother
 100          * checking if there is a fraction in use? Because the old
 101          * sleep handled the full range of integers, that's why, and a
 102          * double can't handle a large long. This is fairly useless
 103          * given how large a number a double can hold on most
 104          * machines, but now we won't ever have trouble. If you want
 105          * 1000000000.9 seconds of sleep, well, that's your
 106          * problem. Why use an isdigit() check instead of checking for
 107          * a period? Because doing it this way means locales will be
 108          * handled transparently by the atof code.
 109          */
 110         fracflag = 0;
 111         arg = *argv;
 112         for (temp = arg; *temp != '\0'; temp++)
 113                 if (!isdigit(*temp))
 114                         fracflag++;
 115
 116         if (fracflag) {
 117                 val = atof(arg);
 118                 if (val <= 0)
 119                         exit(0);
 120                 ival = floor(val);
 121                 fval = (1000000000 * (val-ival));
 122                 ntime.tv_sec = ival;
 123                 ntime.tv_nsec = fval;
 124         }
 125         else{
 126                 ntime.tv_sec = atol(arg);
 127                 if (ntime.tv_sec <= 0)
 128                         exit(0);
 129                 ntime.tv_nsec = 0;
 130         }
 131
 132         (void)nanosleep(&ntime, NULL);
 133 #endif
 134
 135         exit(0);
 136         /* NOTREACHED */
 137 }
 138
 139 void
 140 usage()
 141 {
 142         (void)fputs("usage: sleep seconds\n", stderr);
 143         exit(1);
 144         /* NOTREACHED */
 145 }
 146
 147 /* ARGSUSED */
 148 void
 149 alarmhandle(i)
 150         int i;
 151 {
 152         _exit(0);
 153         /* NOTREACHED */
 154 }