1/* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30#if defined(VARIANT_CANCELABLE) && __DARWIN_NON_CANCELABLE != 0 31#error cancellable call vs. __DARWIN_NON_CANCELABLE mismatch 32#endif 33 34#if defined(LIBC_SCCS) && !defined(lint) 35static char sccsid[] = "@(#)sleep.c 8.1 (Berkeley) 6/4/93"; 36#endif /* LIBC_SCCS and not lint */ 37#include <sys/cdefs.h> 38__FBSDID("$FreeBSD: src/lib/libc/gen/sleep.c,v 1.33 2009/12/05 19:31:38 ed Exp $"); 39 40#include "namespace.h" 41#include <errno.h> 42#include <limits.h> 43#include <time.h> 44#include <unistd.h> 45#include "un-namespace.h" 46 47unsigned int 48__sleep(unsigned int seconds) 49{ 50 struct timespec time_to_sleep; 51 struct timespec time_remaining; 52 53 /* 54 * Avoid overflow when `seconds' is huge. This assumes that 55 * the maximum value for a time_t is >= INT_MAX. 56 */ 57 if (seconds > INT_MAX) 58 return (seconds - INT_MAX + __sleep(INT_MAX)); 59 60 time_to_sleep.tv_sec = seconds; 61 time_to_sleep.tv_nsec = 0; 62 if (_nanosleep(&time_to_sleep, &time_remaining) != -1) 63 return (0); 64 if (errno != EINTR) 65 return (seconds); /* best guess */ 66 return (time_remaining.tv_sec + 67 (time_remaining.tv_nsec != 0)); /* round up */ 68} 69 70__weak_reference(__sleep, sleep); 71__weak_reference(__sleep, _sleep); 72