Allows a process to change the size of its supervisor, executive,
    and kernel stacks by altering the values in the stack limit for a
    memory stack and base arrays held in P1 (per-process) space.

    Format

      SYS$SETSTK  inadr ,[retadr] ,[acmode]

    C Prototype

      int sys$setstk  (struct _va_range *inadr, struct _va_range

                      *retadr, unsigned int acmode);