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alarm
=====
Syntax
------
#include <unistd.h>
unsigned alarm(unsigned seconds);
Description
-----------
This function causes the signal SIGALRM to be raised in SECONDS seconds.
A value of zero for SECONDS cancels any pending alarm. If an alarm has
previously been set, the new alarm delay will superceed the prior call.
Return Value
------------
The number of seconds remaining on the timer (i.e. always SECONDS).
Example
-------
signal(SIGALRM,my_alarm_routine);
alarm(5);