NAME    [Toc]    [Back]

     ualarm - schedule signal after specified time

LIBRARY    [Toc]    [Back]

     Standard C Library (libc, -lc)

SYNOPSIS    [Toc]    [Back]

     #include <unistd.h>

     useconds_t
     ualarm(useconds_t microseconds, useconds_t interval);

DESCRIPTION    [Toc]    [Back]

     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 microseconds have passed).

RETURN VALUES    [Toc]    [Back]

     When the signal has successfully been caught, ualarm() returns the amount
     of time left on the clock.  The maximum number of microseconds allowed is
     2147483647.  If there is an error setting the timer, ualarm() returns
     ((useconds_t) -1).

SEE ALSO    [Toc]    [Back]

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

STANDARDS    [Toc]    [Back]

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

HISTORY    [Toc]    [Back]

     The ualarm() function appeared in 4.3BSD.

BSD                             April 19, 1994                             BSD