sleep.c revision 99110
11556Srgrimes/* 21556Srgrimes * Copyright (c) 1988, 1993, 1994 31556Srgrimes * The Regents of the University of California. All rights reserved. 41556Srgrimes * 51556Srgrimes * Redistribution and use in source and binary forms, with or without 61556Srgrimes * modification, are permitted provided that the following conditions 71556Srgrimes * are met: 81556Srgrimes * 1. Redistributions of source code must retain the above copyright 91556Srgrimes * notice, this list of conditions and the following disclaimer. 101556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111556Srgrimes * notice, this list of conditions and the following disclaimer in the 121556Srgrimes * documentation and/or other materials provided with the distribution. 131556Srgrimes * 3. All advertising materials mentioning features or use of this software 141556Srgrimes * must display the following acknowledgement: 151556Srgrimes * This product includes software developed by the University of 161556Srgrimes * California, Berkeley and its contributors. 171556Srgrimes * 4. Neither the name of the University nor the names of its contributors 181556Srgrimes * may be used to endorse or promote products derived from this software 191556Srgrimes * without specific prior written permission. 201556Srgrimes * 211556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311556Srgrimes * SUCH DAMAGE. 321556Srgrimes */ 331556Srgrimes 341556Srgrimes#ifndef lint 3520423Sstevestatic char const copyright[] = 361556Srgrimes"@(#) Copyright (c) 1988, 1993, 1994\n\ 371556Srgrimes The Regents of the University of California. All rights reserved.\n"; 381556Srgrimes#endif /* not lint */ 391556Srgrimes 401556Srgrimes#ifndef lint 4136152Scharnier#if 0 4236152Scharnierstatic char sccsid[] = "@(#)sleep.c 8.3 (Berkeley) 4/2/94"; 4336152Scharnier#endif 441556Srgrimes#endif /* not lint */ 4599110Sobrien#include <sys/cdefs.h> 4699110Sobrien__FBSDID("$FreeBSD: head/bin/sleep/sleep.c 99110 2002-06-30 05:15:05Z obrien $"); 471556Srgrimes 4851835Sru#include <ctype.h> 4951835Sru#include <limits.h> 501556Srgrimes#include <stdio.h> 511556Srgrimes#include <stdlib.h> 5251835Sru#include <time.h> 531556Srgrimes#include <unistd.h> 541556Srgrimes 5590111Simpvoid usage(void); 561556Srgrimes 571556Srgrimesint 5890111Simpmain(int argc, char *argv[]) 591556Srgrimes{ 6051835Sru struct timespec time_to_sleep; 6151835Sru long l; 6251835Sru int ch, neg; 6351835Sru char *p; 641556Srgrimes 6524348Simp while ((ch = getopt(argc, argv, "")) != -1) 661556Srgrimes switch(ch) { 671556Srgrimes case '?': 681556Srgrimes default: 691556Srgrimes usage(); 7051835Sru /* NOTREACHED */ 711556Srgrimes } 721556Srgrimes argc -= optind; 731556Srgrimes argv += optind; 741556Srgrimes 7551835Sru if (argc != 1) { 761556Srgrimes usage(); 7751835Sru /* NOTREACHED */ 7851835Sru } 791556Srgrimes 8051835Sru p = argv[0]; 8151835Sru 8251835Sru /* Skip over leading whitespaces. */ 8351835Sru while (isspace((unsigned char)*p)) 8451835Sru ++p; 8551835Sru 8651835Sru /* Check for optional `+' or `-' sign. */ 8751835Sru neg = 0; 8851835Sru if (*p == '-') { 8951835Sru neg = 1; 9051835Sru ++p; 9151835Sru } 9251835Sru else if (*p == '+') 9351835Sru ++p; 9451835Sru 9551835Sru /* Calculate seconds. */ 9651835Sru if (isdigit((unsigned char)*p)) { 9751835Sru l = strtol(p, &p, 10); 9851835Sru if (l > INT_MAX) { 9951835Sru /* 10051835Sru * Avoid overflow when `seconds' is huge. This assumes 10151835Sru * that the maximum value for a time_t is >= INT_MAX. 10251835Sru */ 10351835Sru l = INT_MAX; 10451835Sru } 10551835Sru } else 10651835Sru l = 0; 10751835Sru time_to_sleep.tv_sec = (time_t)l; 10851835Sru 10951835Sru /* Calculate nanoseconds. */ 11051835Sru time_to_sleep.tv_nsec = 0; 11151835Sru 11251835Sru if (*p == '.') { /* Decimal point. */ 11351835Sru l = 100000000L; 11451835Sru do { 11551835Sru if (isdigit((unsigned char)*++p)) 11651835Sru time_to_sleep.tv_nsec += (*p - '0') * l; 11751835Sru else 11851835Sru break; 11951835Sru } while (l /= 10); 12051835Sru } 12151835Sru 12251835Sru if (!neg && (time_to_sleep.tv_sec > 0 || time_to_sleep.tv_nsec > 0)) 12351835Sru (void)nanosleep(&time_to_sleep, (struct timespec *)NULL); 12451835Sru 1251556Srgrimes exit(0); 1261556Srgrimes} 1271556Srgrimes 1281556Srgrimesvoid 12990111Simpusage(void) 1301556Srgrimes{ 1311556Srgrimes 1321556Srgrimes (void)fprintf(stderr, "usage: sleep seconds\n"); 1331556Srgrimes exit(1); 1341556Srgrimes} 135