|File: [cvs.NetBSD.org] / src / lib / libc / gen / alarm.3 (download)
Revision 1.20, Wed Oct 2 10:44:27 2002 UTC (16 years, 2 months ago) by wiz
CVS Tags: nathanw_sa_before_merge, nathanw_sa_base, fvdl_fs64_base
Changes since 1.19: +2 -2
process only has one c.
.\" $NetBSD: alarm.3,v 1.20 2002/10/02 10:44:27 wiz Exp $
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.\" @(#)alarm.3 8.2 (Berkeley) 4/19/94
.Dd April 19, 1994
.Dt ALARM 3
.Nd set signal timer alarm
.Fd #include \*[Lt]unistd.h\*[Gt]
.Ft unsigned int
.Fn alarm "unsigned int seconds"
This interface is made obsolete by
.Xr setitimer 2 .
function sets a timer to deliver the signal
to the calling process
after the call to
.Fn alarm .
If an alarm has already been set with
but has not been delivered, another call to
will supersede the prior call.
.Fn alarm "0"
voids the current
alarm and the signal SIGALRM will not be delivered.
The maximum number of
The return value of
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,
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
function conforms to
.St -p1003.1-90 .
function appeared in
.At v7 .