BSD 2.11 - man page for ualarm (bsd section 3)
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ualarm - schedule signal after specified time
unsigned ualarm(value, interval)
This is a simplified interface to setitimer(2).
Ualarm causes signal SIGALRM, see signal(3C), to be sent to the invoking process in a num-
ber of microseconds given by the value argument. Unless caught or ignored, the signal
terminates the process.
If the interval argument is non-zero, the SIGALRM signal will be sent to the process every
interval microseconds after the timer expires (e.g. after value microseconds have passed).
Because of scheduling delays, resumption of execution of when the signal is caught may be
delayed an arbitrary amount. The longest specifiable delay time (on the vax) is
The return value is the amount of time previously remaining in the alarm clock.
getitimer(2), setitimer(2), sigpause(2), sigvec(2), signal(3C), sleep(3), alarm(3),
On the PDP-11, setitimer(2) rounds the number of microseconds up to seconds resolution,
therefore ualarm doesn't give you any more resolution than alarm(3).
4.3 Berkeley Distribution August 26, 1988 UALARM(3)
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