sleep.c revision 71579
11573Srgrimes/* 21573Srgrimes * Copyright (c) 1989, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * Redistribution and use in source and binary forms, with or without 61573Srgrimes * modification, are permitted provided that the following conditions 71573Srgrimes * are met: 81573Srgrimes * 1. Redistributions of source code must retain the above copyright 91573Srgrimes * notice, this list of conditions and the following disclaimer. 101573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111573Srgrimes * notice, this list of conditions and the following disclaimer in the 121573Srgrimes * documentation and/or other materials provided with the distribution. 131573Srgrimes * 3. All advertising materials mentioning features or use of this software 141573Srgrimes * must display the following acknowledgement: 151573Srgrimes * This product includes software developed by the University of 161573Srgrimes * California, Berkeley and its contributors. 171573Srgrimes * 4. Neither the name of the University nor the names of its contributors 181573Srgrimes * may be used to endorse or promote products derived from this software 191573Srgrimes * without specific prior written permission. 201573Srgrimes * 211573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311573Srgrimes * SUCH DAMAGE. 321573Srgrimes */ 331573Srgrimes 341573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 3530510Sache#if 0 361573Srgrimesstatic char sccsid[] = "@(#)sleep.c 8.1 (Berkeley) 6/4/93"; 3730510Sache#endif 3830510Sachestatic char rcsid[] = 3950476Speter "$FreeBSD: head/lib/libc/gen/sleep.c 71579 2001-01-24 13:01:12Z deischen $"; 401573Srgrimes#endif /* LIBC_SCCS and not lint */ 411573Srgrimes 4271579Sdeischen#include "namespace.h" 4330510Sache#include <errno.h> 4430510Sache#include <limits.h> 4530479Sache#include <time.h> 461573Srgrimes#include <unistd.h> 4771579Sdeischen#include "un-namespace.h" 481573Srgrimes 491573Srgrimesunsigned int 5055837Sjasone__sleep(seconds) 511573Srgrimes unsigned int seconds; 521573Srgrimes{ 5338938Sache struct timespec time_to_sleep; 5438938Sache struct timespec time_remaining; 5513545Sjulian 5638938Sache /* 5738938Sache * Avoid overflow when `seconds' is huge. This assumes that 5838938Sache * the maximum value for a time_t is >= INT_MAX. 5938938Sache */ 6038938Sache if (seconds > INT_MAX) 6155837Sjasone return (seconds - INT_MAX + __sleep(INT_MAX)); 6230510Sache 6338938Sache time_to_sleep.tv_sec = seconds; 6438938Sache time_to_sleep.tv_nsec = 0; 6556698Sjasone if (_nanosleep(&time_to_sleep, &time_remaining) != -1) 6638938Sache return (0); 6738938Sache if (errno != EINTR) 6838938Sache return (seconds); /* best guess */ 6938938Sache return (time_remaining.tv_sec + 7038938Sache (time_remaining.tv_nsec != 0)); /* round up */ 711573Srgrimes} 7255837Sjasone 7356698Sjasone__weak_reference(__sleep, sleep); 7471579Sdeischen__weak_reference(__sleep, _sleep); 75