.\" Copyright (c) 1983, 1993 .\" The Regents of the University of California. All rights reserved. .\" .\" This module is believed to contain source code proprietary to AT&T. .\" Use and redistribution is subject to the Berkeley Software License .\" Agreement and your Software Agreement with AT&T (Western Electric). .\" .\" @(#)alarm.3 8.1 (Berkeley) 6/5/93 .\" .TH ALARM 3F "June 5, 1993" .UC 5 .SH NAME alarm \- execute a subroutine after a specified time .SH SYNOPSIS .B integer function alarm (time, proc) .br .B integer time .br .B external proc .SH DESCRIPTION This routine arranges for subroutine .I proc to be called after .I time seconds. If .I time is ``0'', the alarm is turned off and no routine will be called. The returned value will be the time remaining on the last alarm. .SH FILES .ie \nM /usr/ucb/lib/libU77.a .el /usr/lib/libU77.a .SH "SEE ALSO" alarm(3C), sleep(3F), signal(3F) .SH BUGS .I Alarm and .I sleep interact. If .I sleep is called after .IR alarm , the .I alarm process will never be called. SIGALRM will occur at the lesser of the remaining .I alarm time or the .I sleep time.