1993-03-21 12:45:37 +03:00
|
|
|
.\" Copyright (c) 1980, 1991 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. 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.
|
|
|
|
|
.\"
|
1993-07-30 12:34:38 +04:00
|
|
|
.\" from: @(#)alarm.3 6.4 (Berkeley) 4/19/91
|
1993-08-01 11:42:49 +04:00
|
|
|
.\" $Id: alarm.3,v 1.3 1993/08/01 07:45:31 mycroft Exp $
|
1993-03-21 12:45:37 +03:00
|
|
|
.\"
|
|
|
|
|
.Dd April 19, 1991
|
|
|
|
|
.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 .
|
|
|
|
|
When the signal has successfully been caught,
|
|
|
|
|
.Fn alarm
|
|
|
|
|
returns the amount of time left on the clock.
|
|
|
|
|
The maximum mumber of
|
|
|
|
|
.Ar seconds
|
|
|
|
|
allowed
|
|
|
|
|
is 2147483647.
|
|
|
|
|
.Pp
|
|
|
|
|
If an alarm has been set with
|
|
|
|
|
.Fn alarm ,
|
|
|
|
|
another call to
|
|
|
|
|
.Fn alarm
|
|
|
|
|
will superceed 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 .
|
