b6cbf7203b
This patch imports the unmodified current version of NetBSD libc. The NetBSD includes are in /nbsd_include, while the libc code itself is split between lib/nbsd_libc and common/lib/libc.
99 lines
2.9 KiB
Groff
99 lines
2.9 KiB
Groff
.\" $NetBSD: alarm.3,v 1.22 2003/08/07 16:42:45 agc Exp $
|
|
.\"
|
|
.\" Copyright (c) 1980, 1991, 1993, 1994
|
|
.\" 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.
|
|
.\" 3. 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.
|
|
.\"
|
|
.\" @(#)alarm.3 8.2 (Berkeley) 4/19/94
|
|
.\"
|
|
.Dd April 19, 1994
|
|
.Dt ALARM 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm alarm
|
|
.Nd set signal timer alarm
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In unistd.h
|
|
.Ft unsigned int
|
|
.Fn alarm "unsigned int seconds"
|
|
.Sh DESCRIPTION
|
|
.Bf -symbolic
|
|
This interface is made obsolete by
|
|
.Xr setitimer 2 .
|
|
.Ef
|
|
.Pp
|
|
The
|
|
.Fn alarm
|
|
function sets a timer to deliver the signal
|
|
.Dv SIGALRM
|
|
to the calling process
|
|
.Ar seconds
|
|
after the call to
|
|
.Fn alarm .
|
|
If an alarm has already been set with
|
|
.Fn alarm
|
|
but has not been delivered, another call to
|
|
.Fn alarm
|
|
will supersede the prior call.
|
|
The request
|
|
.Fn alarm "0"
|
|
voids the current
|
|
alarm and the signal SIGALRM will not be delivered.
|
|
The maximum number of
|
|
.Ar seconds
|
|
allowed
|
|
is 2147483647.
|
|
.Pp
|
|
The return value of
|
|
.Fn alarm
|
|
is the amount of time left on the timer from a previous call to
|
|
.Fn alarm .
|
|
If no alarm is currently set, the return value is 0.
|
|
If there is an error setting the timer,
|
|
.Fn alarm
|
|
returns ((unsigned int) -1).
|
|
.Sh SEE ALSO
|
|
.Xr setitimer 2 ,
|
|
.Xr sigaction 2 ,
|
|
.Xr sigsuspend 2 ,
|
|
.Xr signal 3 ,
|
|
.Xr sigvec 3 ,
|
|
.Xr sleep 3 ,
|
|
.Xr ualarm 3 ,
|
|
.Xr usleep 3
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn alarm
|
|
function conforms to
|
|
.St -p1003.1-90 .
|
|
.Sh HISTORY
|
|
An
|
|
.Fn alarm
|
|
function appeared in
|
|
.At v7 .
|