UALARM(3) Library Functions Manual UALARM(3)
ualarm - schedule signal after interval in microseconds
unsigned ualarm(value, interval)
This is a simplified interface to setitimer() (see getitimer(2)).
ualarm() sends signal SIGALRM, see signal(3V), to the invoking process
in a number 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 (for
instance, after value microseconds have passed).
Because of scheduling delays, resumption of execution of when the sig-
nal is caught may be delayed an arbitrary amount. The longest specifi-
able delay time is 2147483647 microseconds.
The return value is the amount of time previously remaining in the
getitimer(2), sigpause(2V), sigvec(2), alarm(3V), signal(3V),
6 October 1987 UALARM(3)