UALARM(3)                 OpenBSD Programmer's Manual                UALARM(3)

NAME
     ualarm - schedule signal after specified time



SYNOPSIS
     #include <unistd.h>

     useconds_t
     ualarm(useconds_t microseconds, useconds_t interval);

DESCRIPTION
     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. af-
     ter microseconds number of microseconds have passed).

RETURN VALUES
     When the signal has successfully been caught, ualarm() returns the amount
     of time left on the clock.  The maximum value for microseconds allowed is
     2147483647.

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

STANDARDS
     The ualarm() function conforms to X/Open Portability Guide Issue 4.2
     (``XPG4.2'').

HISTORY
     The ualarm() function appeared in 4.3BSD.

OpenBSD 2.6                    November 4, 1997                              1