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1992-08-04
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screen(capsensitive("Talarm"))
NAME
Talarm - schedule an alarm to occur
SYNOPSIS
LONG Talarm(LONG time);
DESCRIPTION
If time is greater than 0, schedule a SIGALRM signal to be
delivered to the process that many seconds from now. Note
that unless a handler for SIGALRM has been established by
means of the \#Psignal\# function, then the signal will kill the
process.
If time == 0, then any previously scheduled alarm is can-
celled.
If time is negative, then no change is made to what alarms
are scheduled; in this case, only the returned value (the
number of seconds left before any alarm) is of interest.
RETURNS
If an alarm had been scheduled before this call to Talarm,
return the number of seconds remaining until that previously
scheduled alarm.
Otherwise, return 0.
SEE ALSO
\#Pause\#, \#Psignal\#
BUGS
Internal calculations are done in milliseconds, not seconds,
so the returned value is not exactly accurate.
For the same reason, setting an alarm more than 2 million
seconds or so into the future will not work correctly.
Last change: Oct. 1, 1991\end