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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)sleep.c 8.1 (Berkeley) 6/4/93 34 * $FreeBSD: src/lib/libc/gen/sleep.c,v 1.28.2.1 2000/03/18 23:13:24 jasone Exp $ 35 * $DragonFly: src/lib/libc/gen/sleep.c,v 1.4 2005/11/13 00:07:42 swildner Exp $ 36 */ 37 38 #include "namespace.h" 39 #include <errno.h> 40 #include <limits.h> 41 #include <time.h> 42 #include <unistd.h> 43 #include "un-namespace.h" 44 45 unsigned int 46 __sleep(unsigned int seconds) 47 { 48 struct timespec time_to_sleep; 49 struct timespec time_remaining; 50 51 /* 52 * Avoid overflow when `seconds' is huge. This assumes that 53 * the maximum value for a time_t is >= INT_MAX. 54 */ 55 if (seconds > INT_MAX) 56 return (seconds - INT_MAX + __sleep(INT_MAX)); 57 58 time_to_sleep.tv_sec = seconds; 59 time_to_sleep.tv_nsec = 0; 60 if (_nanosleep(&time_to_sleep, &time_remaining) != -1) 61 return (0); 62 if (errno != EINTR) 63 return (seconds); /* best guess */ 64 return (time_remaining.tv_sec + 65 (time_remaining.tv_nsec != 0)); /* round up */ 66 } 67 68 __weak_reference(__sleep, sleep); 69 __weak_reference(__sleep, _sleep); 70 71