ualarm(2)                                                         ualarm(2)




 NAME    [Toc]    [Back]
      ualarm - set the interval timer

 SYNOPSIS    [Toc]    [Back]
      #include <unistd.h>

      useconds_t ualarm(useconds_t useconds, useconds_t interval);

 DESCRIPTION    [Toc]    [Back]
      The ualarm() function causes the SIGALRM signal to be generated for
      the calling process after the number of real-time microseconds
      specified by the useconds argument has elapsed. When the interval
      argument is non-zero, repeated timeout notification occurs with a
      period in microseconds specified by the interval argument. If the
      notification signal, SIGALRM, is not caught or ignored, the calling
      process is terminated.

      Implementations may place limitations on the granularity of timer
      values. For each interval timer, if the requested timer value requires
      a finer granularity than the implementation supports, the actual timer
      value will be rounded up to the next supported value.

      Interactions between ualarm() and either alarm() or sleep() are
      unspecified.

 RETURN VALUE    [Toc]    [Back]
      The ualarm() function returns the number of microseconds remaining
      from the previous ualarm() call. If no timeouts are pending or if
      ualarm() has not previously been called, ualarm() returns 0.

 ERRORS    [Toc]    [Back]
      No errors are defined.

 APPLICATION USAGE    [Toc]    [Back]
      The ualarm() function is a simplified interface to setitimer(), and
      uses the ITIMER_REAL interval timer.

 SEE ALSO    [Toc]    [Back]
      alarm(2), getitimer(2), sleep(3C), <unistd.h>.

 CHANGE HISTORY    [Toc]    [Back]
      First released in Issue 4, Version 2.


 Hewlett-Packard Company            - 1 -   HP-UX 11i Version 2: August 2003