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-.\" $FreeBSD: src/lib/libc/sys/nanosleep.2,v 1.8.2.4 2001/12/14 18:34:01 ru Exp $
-.\"	$OpenBSD: nanosleep.2,v 1.1 1997/04/20 20:56:20 tholo Exp $
-.\"	$NetBSD: nanosleep.2,v 1.1 1997/04/17 18:12:02 jtc Exp $
-.\"
-.\" Copyright (c) 1986, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
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-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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-.\"
-.\"     @(#)sleep.3	8.1 (Berkeley) 6/4/93
-.\"
-.Dd April 17, 1997
-.Dt NANOSLEEP 2
-.Os
-.Sh NAME
-.Nm nanosleep
-.Nd suspend thread execution for an interval measured in nanoseconds
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In time.h
-.Ft int
-.Fo nanosleep
-.Fa "const struct timespec *rqtp"
-.Fa "struct timespec *rmtp"
-.Fc
-.Sh DESCRIPTION
-The
-.Fn nanosleep
-function causes the calling thread to sleep
-for the amount of time specified in
-.Fa rqtp
-(the actual time slept may be longer, due to system latencies
-and possible limitations in the timer resolution of the hardware).
-An unmasked signal will
-cause
-.Fn nanosleep
-to terminate the sleep early, regardless of the
-.Dv SA_RESTART
-value on the interrupting signal.
-.Sh RETURN VALUES
-If
-.Fn nanosleep
-returns because the requested time has elapsed,
-the value returned will be zero.
-.Pp
-If
-.Fn nanosleep
-returns due to the delivery of a signal, the value returned
-will be the -1, and the global variable
-.Va errno
-will be set to indicate the interruption.
-If
-.Fa rmtp
-is
-.Pf non- Dv NULL ,
-the timespec structure it references is updated to contain the
-unslept amount (the request time minus the time actually slept).
-.Sh ERRORS
-The
-.Fn nanosleep
-call fails if:
-.Bl -tag -width Er
-.It Bq Er EINTR
-.Fn nanosleep
-was interrupted by the delivery of a signal.
-.It Bq Er EINVAL
-.Fa rqtp
-specified a nanosecond value less than zero
-or greater than or equal to 1000 million.
-.El
-.Sh SEE ALSO
-.Xr sigsuspend 2 ,
-.Xr sleep 3
-.Sh STANDARDS
-The
-.Fn nanosleep
-function conforms to
-.St -p1003.1b-93 .