Libc-320.tar.gz

[apple/libc.git] / gen / alarm.3

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-.\" 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. 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.
-.\"
-.\"     @(#)alarm.3    8.2 (Berkeley) 4/19/94
-.\" $FreeBSD: src/lib/libc/gen/alarm.3,v 1.15 2001/10/01 16:08:50 ru Exp $
-.\"
-.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 after the specified number of
-.Fa seconds .
-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.
-.Pp
-Due to
-.Xr setitimer 2
-restriction the maximum number of
-.Ar seconds
-allowed is 100000000.
-.Sh RETURN VALUES
-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.
-.Sh SEE ALSO
-.Xr setitimer 2 ,
-.Xr sigaction 2 ,
-.Xr sigpause 2 ,
-.Xr sigvec 2 ,
-.Xr signal 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 .