VMS Help CC, Run-time functions, setitimer  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Sets the value of interval timers.

  Syntax:

        #include <time.h>
        #define ITIMER_REAL 0
        #define ITIMER_VIRTUAL 1
        #define ITIMER_PROF 2

        int setitimer (int which,
                       struct itimerval *value,
                       struct itimerval *ovalue);