ualarm man page on FreeBSD

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UALARM(3)		 BSD Library Functions Manual		     UALARM(3)

     ualarm — schedule signal after specified time

     Standard C Library (libc, -lc)

     #include <unistd.h>

     ualarm(useconds_t microseconds, useconds_t interval);

     This is a simplified interface to setitimer(2).

     The ualarm() function waits a count of microseconds before asserting the
     terminating signal SIGALRM.  System activity or time used in processing
     the call may cause a slight delay.

     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 microseconds number of microseconds have passed).

     Due to setitimer(2) restriction the maximum number of microseconds and
     interval is limited to 100000000000000 (in case this value fits in the
     unsigned integer).

     When the signal has successfully been caught, ualarm() returns the amount
     of time left on the clock.

     A microsecond is 0.000001 seconds.

     getitimer(2), setitimer(2), sigpause(2), sigvec(2), alarm(3), signal(3),
     sleep(3), usleep(3)

     The ualarm() function appeared in 4.3BSD.

BSD				April 19, 1994				   BSD

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