minix/lib/nbsd_libc/gen/alarm.3
Gianluca Guida b6cbf7203b Import unmodified NetBSD libc in trunk
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.
2011-02-14 19:36:03 +00:00

98 lines
2.9 KiB
Groff

.\" $NetBSD: alarm.3,v 1.22 2003/08/07 16:42:45 agc Exp $
.\"
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.\" @(#)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 .