On Alpha and Integrity server systems, allows modification of
    the user capability set for a specified kernel thread, or for the
    global user capability process default.

    This service accepts 64-bit addresses.

    Format

      SYS$PROCESS_CAPABILITIES  [pidadr] [,prcnam] [,select_mask]

                                [,modify_mask] [,prev_mask] [,flags]

    C Prototype

      int sys$process_capabilities  (unsigned int *pidadr, void

                                    *prcnam, struct _generic_64

                                    *select_mask, struct _generic_64

                                    *modify_mask, struct _generic_64

                                    *prev_mask, struct _generic_64

                                    *flags);