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long alarm(long seconds);
seconds: [in] the delay.
If the call completes successfully, the taks will receive a
SIGALARM signal after a delay of seconds seconds. A delay
of zero seconds simply cancel the alarm. If an previous alarm was
activated when the call is made then the previous alarm is cancelled.
Internally, the call just sets an interruption timer.
If a previous alarm was activated, the call returns the time delay before the expiration of that previous alarm (now canceled). Otherwise, it returns zero.
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