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NetBSD/lib/libc/gen/sleep.3

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add LIBRARY section to man page
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.\" $NetBSD: sleep.3,v 1.9 1998/02/05 18:47:56 perry Exp $
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.\"
.\" 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
.\" are met:
.\" 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
.\" 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
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
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.\" @(#)sleep.3 8.1 (Berkeley) 6/4/93
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.\"
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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
.Fd #include <unistd.h>
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.Ft unsigned int
.Fn sleep "unsigned int seconds"
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.Sh DESCRIPTION
The
.Fn sleep
Describe POSIX behavior of sleep. More could be added, especially describing the effects of scheduling and/or blocking SIGALRM outside of a sleep(). Also, using longjmp() in a signal handler. But this will do until someone gets inspired to fill in the grotty details.
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function suspends execution of the calling process until either the
number of seconds specified by
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.Fa seconds
Describe POSIX behavior of sleep. More could be added, especially describing the effects of scheduling and/or blocking SIGALRM outside of a sleep(). Also, using longjmp() in a signal handler. But this will do until someone gets inspired to fill in the grotty details.
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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
Fix spelling error.
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process. The suspension time may be longer than requested due to the
Describe POSIX behavior of sleep. More could be added, especially describing the effects of scheduling and/or blocking SIGALRM outside of a sleep(). Also, using longjmp() in a signal handler. But this will do until someone gets inspired to fill in the grotty details.
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scheduling of other activity by the system.
.Sh RETURN VALUE
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
Implement sleep() and usleep() in terms of nanosleep(). Uses only one syscall instead of eight, and doesn't have any interactions with alarm or interval timers.
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.Xr nanosleep 2 ,
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.Xr usleep 3
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.Sh STANDARDS
The
.Fn sleep
function conforms to
.St -p1003.1-90 .
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.Sh HISTORY
A
.Fn sleep
function appeared in
.At v7 .