mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-22 11:17:19 +00:00
84 lines
2.9 KiB
Groff
84 lines
2.9 KiB
Groff
.\" 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:
|
|
.\" 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.
|
|
.\" 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.
|
|
.\"
|
|
.\" @(#)sleep.3 8.1 (Berkeley) 6/4/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd February 13, 1998
|
|
.Dt SLEEP 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm sleep
|
|
.Nd suspend process execution for an interval measured in seconds
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In unistd.h
|
|
.Ft unsigned int
|
|
.Fn sleep "unsigned int seconds"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn sleep
|
|
function suspends execution of the calling process until either
|
|
.Fa seconds
|
|
seconds have elapsed or a signal is delivered to the process and its
|
|
action is to invoke a signal-catching function or to terminate the
|
|
process.
|
|
System activity may lengthen the sleep by an indeterminate amount.
|
|
.Pp
|
|
This function is implemented using
|
|
.Xr nanosleep 2
|
|
by pausing for
|
|
.Fa seconds
|
|
seconds or until a signal occurs.
|
|
Consequently, in this implementation,
|
|
sleeping has no effect on the state of process timers,
|
|
and there is no special handling for SIGALRM.
|
|
.Sh RETURN VALUES
|
|
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 requested time minus the time actually
|
|
slept) in seconds.
|
|
.Sh SEE ALSO
|
|
.Xr nanosleep 2 ,
|
|
.Xr usleep 3
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn sleep
|
|
function conforms to
|
|
.St -p1003.1-90 .
|
|
.Sh HISTORY
|
|
A
|
|
.Fn sleep
|
|
function appeared in
|
|
.At v7 .
|