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.\" Copyright (c) 1980, 1991, 1993, 1994
.\" The Regents of the University of California. All rights reserved.
.\"
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.\" 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.
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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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.\"
.\" @(#)alarm.3 8.2 (Berkeley) 4/19/94
.\"
.Dd April 19, 1994
.Dt ALARM 3
.Os BSD 4
.Sh NAME
.Nm alarm
.Nd set signal timer alarm
.Sh SYNOPSIS
.Fd #include <unistd.h>
.Ft u_int
.Fn alarm "u_int seconds"
.Sh DESCRIPTION
.Bf -symbolic
This interface is made obsolete by setitimer(2).
.Ef
.Pp
The
.Fn alarm
function
waits a count of
.Ar seconds
before asserting the terminating signal
.Dv SIGALRM .
.Fn alarm
returns the amount of time unexpired
from any previously pending alarm.
The maximum number of
.Ar seconds
allowed
is 2147483647.
.Pp
If an alarm has been set with
.Fn alarm ,
another call to
.Fn alarm
will supersede the prior call.
The request
.Fn alarm "0"
voids the current
alarm.
.Sh SEE ALSO
.Xr sigaction 2 ,
.Xr setitimer 2 ,
.Xr sigpause 2 ,
.Xr sigvec 2 ,
.Xr signal 3 ,
.Xr sleep 3 ,
.Xr ualarm 3 ,
.Xr usleep 3
.Sh HISTORY
An
.Fn alarm
function appeared in
.At v7 .
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