sleep.c revision 210696
1139969Simp/*- 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 * 4. Neither the name of the University nor the names of its contributors 141556Srgrimes * may be used to endorse or promote products derived from this software 151556Srgrimes * without specific prior written permission. 161556Srgrimes * 171556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 181556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 201556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 211556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 221556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 231556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 241556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 251556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 261556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 271556Srgrimes * SUCH DAMAGE. 281556Srgrimes */ 291556Srgrimes 30114433Sobrien#if 0 311556Srgrimes#ifndef lint 3220423Sstevestatic char const copyright[] = 331556Srgrimes"@(#) Copyright (c) 1988, 1993, 1994\n\ 341556Srgrimes The Regents of the University of California. All rights reserved.\n"; 351556Srgrimes#endif /* not lint */ 361556Srgrimes 371556Srgrimes#ifndef lint 3836152Scharnierstatic char sccsid[] = "@(#)sleep.c 8.3 (Berkeley) 4/2/94"; 39114433Sobrien#endif /* not lint */ 4036152Scharnier#endif 4199110Sobrien#include <sys/cdefs.h> 4299110Sobrien__FBSDID("$FreeBSD: head/bin/sleep/sleep.c 210696 2010-07-31 17:41:58Z kib $"); 431556Srgrimes 4451835Sru#include <ctype.h> 45210679Skib#include <err.h> 4651835Sru#include <limits.h> 47210679Skib#include <signal.h> 48210696Skib#include <stdint.h> 49114575Smarkm#include <stdio.h> 501556Srgrimes#include <stdlib.h> 5151835Sru#include <time.h> 521556Srgrimes#include <unistd.h> 531556Srgrimes 54210679Skibstatic void usage(void); 551556Srgrimes 56210679Skibstatic volatile sig_atomic_t report_requested; 57210679Skibstatic void 58210679Skibreport_request(int signo __unused) 59210679Skib{ 60210679Skib 61210679Skib report_requested = 1; 62210679Skib} 63210679Skib 641556Srgrimesint 6590111Simpmain(int argc, char *argv[]) 661556Srgrimes{ 6751835Sru struct timespec time_to_sleep; 68210679Skib long l, original; 69106883Snjl int neg; 7051835Sru char *p; 711556Srgrimes 72210679Skib if (argc != 2) 731556Srgrimes usage(); 741556Srgrimes 75106883Snjl p = argv[1]; 7651835Sru 7751835Sru /* Skip over leading whitespaces. */ 78106882Snjl while (isspace((unsigned char)*p)) 7951835Sru ++p; 8051835Sru 81106882Snjl /* Check for optional `+' or `-' sign. */ 82106882Snjl neg = 0; 83106882Snjl if (*p == '-') { 84106882Snjl neg = 1; 85106882Snjl ++p; 86210679Skib if (!isdigit((unsigned char)*p) && *p != '.') 87106883Snjl usage(); 8851835Sru } 89106882Snjl else if (*p == '+') 90106882Snjl ++p; 9151835Sru 9251835Sru /* Calculate seconds. */ 93106882Snjl if (isdigit((unsigned char)*p)) { 94106882Snjl l = strtol(p, &p, 10); 95210679Skib 96210679Skib /* 97210679Skib * Avoid overflow when `seconds' is huge. This assumes 98210679Skib * that the maximum value for a time_t is <= INT_MAX. 99210679Skib */ 100210679Skib if (l > INT_MAX) 10151835Sru l = INT_MAX; 102106882Snjl } else 103106882Snjl l = 0; 10451835Sru time_to_sleep.tv_sec = (time_t)l; 10551835Sru 10651835Sru /* Calculate nanoseconds. */ 10751835Sru time_to_sleep.tv_nsec = 0; 10851835Sru 10951835Sru if (*p == '.') { /* Decimal point. */ 11051835Sru l = 100000000L; 11151835Sru do { 112106882Snjl if (isdigit((unsigned char)*++p)) 11351835Sru time_to_sleep.tv_nsec += (*p - '0') * l; 11451835Sru else 11551835Sru break; 116114575Smarkm l /= 10; 117114575Smarkm } while (l); 11851835Sru } 11951835Sru 120210679Skib /* Skip over the trailing whitespace. */ 121210679Skib while (isspace((unsigned char)*p)) 122210679Skib ++p; 123210679Skib if (*p != '\0') 124210679Skib usage(); 12551835Sru 126210679Skib signal(SIGINFO, report_request); 127210679Skib if (!neg && (time_to_sleep.tv_sec > 0 || time_to_sleep.tv_nsec > 0)) { 128210679Skib original = time_to_sleep.tv_sec; 129210679Skib while (nanosleep(&time_to_sleep, &time_to_sleep) != 0) { 130210679Skib if (report_requested) { 131210679Skib /* 132210679Skib * Reporting does not bother with 133210679Skib * fractions of a second... 134210679Skib */ 135210696Skib warnx("about %jd second(s) left" 136210696Skib " out of the original %jd", 137210696Skib (intmax_t)time_to_sleep.tv_sec, 138210696Skib (intmax_t)original); 139210679Skib report_requested = 0; 140210679Skib } else 141210679Skib break; 142210679Skib } 143210679Skib } 144210679Skib 145210679Skib return (0); 1461556Srgrimes} 1471556Srgrimes 148210679Skibstatic void 14990111Simpusage(void) 1501556Srgrimes{ 151210679Skib static const char msg[] = "usage: sleep seconds\n"; 1521556Srgrimes 153114575Smarkm write(STDERR_FILENO, msg, sizeof(msg) - 1); 154210679Skib exit(1); 1551556Srgrimes} 156