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alarm - schedule signal after specified time
Alarm causes signal SIGALRM, see signal(2), to be sent to the invoking process in a number
of seconds given by the argument. Unless caught or ignored, the signal terminates the
Alarm requests are not stacked; successive calls reset the alarm clock. If the argument
is 0, any alarm request is cancelled. Because the clock has a 1-second resolution, the
signal may occur up to one second early; because of scheduling delays, resumption of exe-
cution of when the signal is caught may be delayed an arbitrary amount. The longest
specifiable delay time is 65535 seconds.
The return value is the amount of time previously remaining in the alarm clock.
pause(2), signal(2), sleep(3)
(alarm = 27.)
(seconds in r0)
(previous amount in r0)
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