usleep.c revision 30646 
1145510Sdarrenr/*
2145510Sdarrenr * Copyright (c) 1989, 1993
3145510Sdarrenr *	The Regents of the University of California.  All rights reserved.
4145510Sdarrenr *
5145510Sdarrenr * Redistribution and use in source and binary forms, with or without
6145510Sdarrenr * modification, are permitted provided that the following conditions
7145510Sdarrenr * are met:
8145510Sdarrenr * 1. Redistributions of source code must retain the above copyright
9145510Sdarrenr *    notice, this list of conditions and the following disclaimer.
10145510Sdarrenr * 2. Redistributions in binary form must reproduce the above copyright
11145510Sdarrenr *    notice, this list of conditions and the following disclaimer in the
12145510Sdarrenr *    documentation and/or other materials provided with the distribution.
13145510Sdarrenr * 3. All advertising materials mentioning features or use of this software
14145510Sdarrenr *    must display the following acknowledgement:
15145510Sdarrenr *	This product includes software developed by the University of
16145510Sdarrenr *	California, Berkeley and its contributors.
17145510Sdarrenr * 4. Neither the name of the University nor the names of its contributors
18145510Sdarrenr *    may be used to endorse or promote products derived from this software
19145510Sdarrenr *    without specific prior written permission.
20145510Sdarrenr *
21145510Sdarrenr * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22145510Sdarrenr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23145510Sdarrenr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24145510Sdarrenr * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25145510Sdarrenr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26145510Sdarrenr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27145510Sdarrenr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28145510Sdarrenr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29145510Sdarrenr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30145510Sdarrenr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31145510Sdarrenr * SUCH DAMAGE.
32145510Sdarrenr */
33145510Sdarrenr
34145510Sdarrenr#if defined(LIBC_SCCS) && !defined(lint)
35145510Sdarrenr#if 0
36145510Sdarrenrstatic char sccsid[] = "@(#)usleep.c	8.1 (Berkeley) 6/4/93";
37#endif
38static char rcsid[] =
39	"$Id: usleep.c,v 1.19 1997/10/17 09:40:08 ache Exp $";
40#endif /* LIBC_SCCS and not lint */
41
42#include <errno.h>
43#include <time.h>
44#include <unistd.h>
45
46int
47usleep(useconds)
48	unsigned int useconds;
49{
50	struct timespec time_to_sleep;
51
52	if (useconds >= 1000000) {
53		errno = EINVAL;
54		return -1;
55	}
56	if (useconds) {
57		time_to_sleep.tv_nsec = useconds * 1000;
58		time_to_sleep.tv_sec = 0;
59		return nanosleep(&time_to_sleep, NULL);
60	}
61	return 0;
62}
63