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	1	.\" $FreeBSD: src/lib/libc/sys/nanosleep.2,v 1.8.2.4 2001/12/14 18:34:01 ru Exp $
	2	.\" $OpenBSD: nanosleep.2,v 1.1 1997/04/20 20:56:20 tholo Exp $
	3	.\" $NetBSD: nanosleep.2,v 1.1 1997/04/17 18:12:02 jtc Exp $
	4	.\"
	5	.\" Copyright (c) 1986, 1991, 1993
	6	.\" The Regents of the University of California. All rights reserved.
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	12	.\" notice, this list of conditions and the following disclaimer.
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	14	.\" notice, this list of conditions and the following disclaimer in the
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	18	.\" This product includes software developed by the University of
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	29	.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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	35	.\"
	36	.\" @(#)sleep.3 8.1 (Berkeley) 6/4/93
	37	.\"
	38	.Dd April 17, 1997
	39	.Dt NANOSLEEP 2
	40	.Os
	41	.Sh NAME
	42	.Nm nanosleep
	43	.Nd suspend thread execution for an interval measured in nanoseconds
	44	.Sh LIBRARY
	45	.Lb libc
	46	.Sh SYNOPSIS
	47	.In time.h
	48	.Ft int
	49	.Fn nanosleep "const struct timespec rqtp" "struct timespec rmtp"
	50	.Sh DESCRIPTION
	51	.Fn Nanosleep
	52	causes the calling thread to sleep for the specified time
	53	(the actual time slept may be longer, due to system latencies
	54	and possible limitations in the timer resolution of the hardware).
	55	An unmasked signal will
	56	cause it to terminate the sleep early, regardless of the
	57	.Dv SA_RESTART
	58	value on the interrupting signal.
	59	.Sh RETURN VALUES
	60	If the
	61	.Fn nanosleep
	62	function returns because the requested time has elapsed, the value
	63	returned will be zero.
	64	.Pp
	65	If the
	66	.Fn nanosleep
	67	function returns due to the delivery of a signal, the value returned
	68	will be the -1, and the global variable
	69	.Va errno
	70	will be set to indicate the interruption.
	71	If
	72	.Fa rmtp
	73	is
	74	.Pf non- Dv NULL ,
	75	the timespec structure it references is updated to contain the
	76	unslept amount (the request time minus the time actually slept).
	77	.Sh ERRORS
	78	The
	79	.Fn nanosleep
	80	call fails if:
	81	.Bl -tag -width Er
	82	.It Bq Er EFAULT
	83	Either
	84	.Fa rqtp
	85	or
	86	.Fa rmtp
	87	points to memory that is not a valid part of the process
	88	address space.
	89	.It Bq Er EINTR
	90	.Fn nanosleep
	91	was interrupted by the delivery of a signal.
	92	.It Bq Er EINVAL
	93	.Fa rqtp
	94	specified a nanosecond value less than zero
	95	or greater than or equal to 1000 million.
	96	.It Bq Er ENOSYS
	97	.Fn nanosleep
	98	is not supported by this implementation.
	99	.El
	100	.Sh SEE ALSO
	101	.Xr sigsuspend 2 ,
	102	.Xr sleep 3
	103	.Sh STANDARDS
	104	The
	105	.Fn nanosleep
	106	function conforms to
	107	.St -p1003.1b-93 .