1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __SCCSID("@(#)sleep.c 8.1 (Berkeley) 6/4/93"); 34 __FBSDID("$FreeBSD$"); 35 36 #include "namespace.h" 37 #include <errno.h> 38 #include <limits.h> 39 #include <time.h> 40 #include <unistd.h> 41 #include "un-namespace.h" 42 43 #include "libc_private.h" 44 45 unsigned int __sleep(unsigned int); 46 47 unsigned 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 (((int (*)(const struct timespec *, struct timespec *)) 63 __libc_interposing[INTERPOS_nanosleep])( 64 &time_to_sleep, &time_remaining) != -1) 65 return (0); 66 if (errno != EINTR) 67 return (seconds); /* best guess */ 68 return (time_remaining.tv_sec + 69 (time_remaining.tv_nsec != 0)); /* round up */ 70 } 71 72 __weak_reference(__sleep, sleep); 73 __weak_reference(__sleep, _sleep); 74