1 /* $NetBSD: sleep.c,v 1.22 2008/07/20 00:52:40 lukem 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\ 35 The Regents of the University of California. All rights reserved."); 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 1.22 2008/07/20 00:52:40 lukem 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 static void alarmhandle(int); 57 static 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 default: 76 usage(); 77 } 78 argc -= optind; 79 argv += optind; 80 81 if (argc != 1) 82 usage(); 83 84 /* 85 * Okay, why not just use atof for everything? Why bother 86 * checking if there is a fraction in use? Because the old 87 * sleep handled the full range of integers, that's why, and a 88 * double can't handle a large long. This is fairly useless 89 * given how large a number a double can hold on most 90 * machines, but now we won't ever have trouble. If you want 91 * 1000000000.9 seconds of sleep, well, that's your 92 * problem. Why use an isdigit() check instead of checking for 93 * a period? Because doing it this way means locales will be 94 * handled transparently by the atof code. 95 */ 96 fracflag = 0; 97 arg = *argv; 98 for (temp = arg; *temp != '\0'; temp++) 99 if (!isdigit((unsigned char)*temp)) 100 fracflag++; 101 102 if (fracflag) { 103 val = atof(arg); 104 if (val <= 0) 105 usage(); 106 ival = floor(val); 107 fval = (1000000000 * (val-ival)); 108 ntime.tv_sec = ival; 109 ntime.tv_nsec = fval; 110 } 111 else { 112 ntime.tv_sec = atol(arg); 113 if (ntime.tv_sec <= 0) 114 return EXIT_SUCCESS; 115 ntime.tv_nsec = 0; 116 } 117 118 if (nanosleep(&ntime, NULL) == -1) 119 err(EXIT_FAILURE, "nanosleep failed"); 120 121 return EXIT_SUCCESS; 122 /* NOTREACHED */ 123 } 124 125 void 126 usage(void) 127 { 128 (void)fprintf(stderr, "usage: %s seconds\n", getprogname()); 129 exit(EXIT_FAILURE); 130 /* NOTREACHED */ 131 } 132 133 /* ARGSUSED */ 134 void 135 alarmhandle(int i) 136 { 137 _exit(EXIT_SUCCESS); 138 /* NOTREACHED */ 139 } 140