sleep.c revision 277317
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 * 4. Neither the name of the University nor the names of its contributors 141573Srgrimes * may be used to endorse or promote products derived from this software 151573Srgrimes * without specific prior written permission. 161573Srgrimes * 171573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 181573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 201573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 211573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 221573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 231573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 241573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 251573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 261573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 271573Srgrimes * SUCH DAMAGE. 281573Srgrimes */ 291573Srgrimes 301573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 311573Srgrimesstatic char sccsid[] = "@(#)sleep.c 8.1 (Berkeley) 6/4/93"; 321573Srgrimes#endif /* LIBC_SCCS and not lint */ 3390039Sobrien#include <sys/cdefs.h> 3490039Sobrien__FBSDID("$FreeBSD: stable/10/lib/libc/gen/sleep.c 277317 2015-01-18 11:54:20Z kib $"); 351573Srgrimes 3671579Sdeischen#include "namespace.h" 3730510Sache#include <errno.h> 3830510Sache#include <limits.h> 3930479Sache#include <time.h> 401573Srgrimes#include <unistd.h> 4171579Sdeischen#include "un-namespace.h" 421573Srgrimes 43277317Skib#include "libc_private.h" 44277317Skib 451573Srgrimesunsigned int 46200150Sed__sleep(unsigned int seconds) 471573Srgrimes{ 4838938Sache struct timespec time_to_sleep; 4938938Sache struct timespec time_remaining; 5013545Sjulian 5138938Sache /* 5238938Sache * Avoid overflow when `seconds' is huge. This assumes that 5338938Sache * the maximum value for a time_t is >= INT_MAX. 5438938Sache */ 5538938Sache if (seconds > INT_MAX) 5655837Sjasone return (seconds - INT_MAX + __sleep(INT_MAX)); 5730510Sache 5838938Sache time_to_sleep.tv_sec = seconds; 5938938Sache time_to_sleep.tv_nsec = 0; 60277317Skib if (((int (*)(const struct timespec *, struct timespec *)) 61277317Skib __libc_interposing[INTERPOS_nanosleep])( 62277317Skib &time_to_sleep, &time_remaining) != -1) 6338938Sache return (0); 6438938Sache if (errno != EINTR) 6538938Sache return (seconds); /* best guess */ 6638938Sache return (time_remaining.tv_sec + 67277317Skib (time_remaining.tv_nsec != 0)); /* round up */ 681573Srgrimes} 6955837Sjasone 7056698Sjasone__weak_reference(__sleep, sleep); 7171579Sdeischen__weak_reference(__sleep, _sleep); 72