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