Function - Ring a preset alarm.
[in alarm (receive) right]
The reply port named in the corresponding
The reply status code from the alarm. The possible values
The alarm was delivered without problem.
The alarm_type and/or alarm_time values supplied to
clock_alarm were invalid.
The ledger supplied to clock_alarm was not a ledger.
The alarm was terminated via use of clock_set_time.
The alarm type value supplied to the clock_alarm call.
Only the low order bits of this value are used by the kernel so the high
order bits are available for application use as an alarm identifier.
The time when the alarm message was sent.
A clock_alarm_reply function is called as the result
of a message from the
kernel indicating that a previously requested alarm time (clock_alarm)
Only generic errors apply.