alarm - schedule signal after specified time
This interface is obsoleted by setitimer(2).
Alarm causes signal SIGALRM, see signal(3C), to be sent to the invoking
process in a number of seconds given by the argument. Unless caught or
ignored, the signal terminates the process.
Alarm requests are not stacked; successive calls reset the alarm clock.
If the argument is 0, any alarm request is canceled. Because of sched-
uling delays, resumption of execution of when the signal is caught may
be delayed an arbitrary amount. The longest specifiable delay time is
The return value is the amount of time previously remaining in the
sigpause(2), sigvec(2), signal(3C), sleep(3)
18 July 1983 ALARM(3C)