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Unix Version 7 - man page for alarm (v7 section 2)

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ALARM(2)										 ALARM(2)

       alarm - schedule signal after specified time

       unsigned seconds;

       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)
       sys alarm
       (previous amount in r0)

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