1 /* $NetBSD: sleep.c,v 1.20 2005/10/17 10:11:46 elad 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994\n\ 35 The Regents of the University of California. All rights reserved.\n"); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)sleep.c 8.3 (Berkeley) 4/2/94"; 41 #else 42 __RCSID("$NetBSD: sleep.c,v 1.20 2005/10/17 10:11:46 elad Exp $"); 43 #endif 44 #endif /* not lint */ 45 46 #include <ctype.h> 47 #include <err.h> 48 #include <locale.h> 49 #include <math.h> 50 #include <signal.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <time.h> 54 #include <unistd.h> 55 56 void alarmhandle(int); 57 void usage(void); 58 int main(int, char *[]); 59 60 int 61 main(int argc, char *argv[]) 62 { 63 char *arg, *temp; 64 double fval, ival, val; 65 struct timespec ntime; 66 int ch, fracflag; 67 68 setprogname(argv[0]); 69 (void)setlocale(LC_ALL, ""); 70 71 (void)signal(SIGALRM, alarmhandle); 72 73 while ((ch = getopt(argc, argv, "")) != -1) 74 switch(ch) { 75 case '?': 76 default: 77 usage(); 78 } 79 argc -= optind; 80 argv += optind; 81 82 if (argc != 1) 83 usage(); 84 85 /* 86 * Okay, why not just use atof for everything? Why bother 87 * checking if there is a fraction in use? Because the old 88 * sleep handled the full range of integers, that's why, and a 89 * double can't handle a large long. This is fairly useless 90 * given how large a number a double can hold on most 91 * machines, but now we won't ever have trouble. If you want 92 * 1000000000.9 seconds of sleep, well, that's your 93 * problem. Why use an isdigit() check instead of checking for 94 * a period? Because doing it this way means locales will be 95 * handled transparently by the atof code. 96 */ 97 fracflag = 0; 98 arg = *argv; 99 for (temp = arg; *temp != '\0'; temp++) 100 if (!isdigit((unsigned char)*temp)) 101 fracflag++; 102 103 if (fracflag) { 104 val = atof(arg); 105 if (val <= 0) 106 usage(); 107 ival = floor(val); 108 fval = (1000000000 * (val-ival)); 109 ntime.tv_sec = ival; 110 ntime.tv_nsec = fval; 111 } 112 else{ 113 ntime.tv_sec = atol(arg); 114 if (ntime.tv_sec <= 0) 115 exit(0); 116 ntime.tv_nsec = 0; 117 } 118 119 if (nanosleep(&ntime, NULL) == -1) 120 err(1, "nanosleep failed"); 121 122 exit(0); 123 /* NOTREACHED */ 124 } 125 126 void 127 usage(void) 128 { 129 (void)fprintf(stderr, "usage: %s seconds\n", getprogname()); 130 exit(1); 131 /* NOTREACHED */ 132 } 133 134 /* ARGSUSED */ 135 void 136 alarmhandle(int i) 137 { 138 _exit(0); 139 /* NOTREACHED */ 140 } 141