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BSD 2.11 - man page for ualarm (bsd section 3)

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UALARM(3)										UALARM(3)

       ualarm - schedule signal after specified time

       unsigned ualarm(value, interval)
       unsigned value;
       unsigned 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
       2147483647 microseconds.

       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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