NetBSD/lib/libc/gen/sleep.3

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.\" $NetBSD: sleep.3,v 1.15 2003/08/07 16:42:57 agc Exp $
.\"
.\" Copyright (c) 1986, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
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.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
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.\" 1. Redistributions of source code must retain the above copyright
.\" 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
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" @(#)sleep.3 8.1 (Berkeley) 6/4/93
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.\"
.Dd June 4, 1993
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.Dt SLEEP 3
.Os
.Sh NAME
.Nm sleep
.Nd suspend process execution for interval of seconds
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.Sh LIBRARY
.Lb libc
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.Sh SYNOPSIS
.In unistd.h
.Ft unsigned int
.Fn sleep "unsigned int seconds"
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.Sh DESCRIPTION
The
.Fn sleep
function suspends execution of the calling process until either the
number of seconds specified by
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.Fa seconds
have elapsed or a signal is delivered to the calling process and its
action is to invoke a signal-catching function or to terminate the
process.
The suspension time may be longer than requested due to the
scheduling of other activity by the system.
.Sh RETURN VALUES
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If the
.Fn sleep
function returns because the requested time has elapsed, the value
returned will be zero.
If the
.Fn sleep
function returns due to the delivery of a signal, the value returned
will be the unslept amount (the request time minus the time actually
slept) in seconds.
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.Sh SEE ALSO
.Xr nanosleep 2 ,
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.Xr usleep 3
.Sh STANDARDS
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The
.Fn sleep
function conforms to
.St -p1003.1-90 .
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.Sh HISTORY
A
.Fn sleep
function appeared in
.At v7 .