Modifies the user authorization file (UAF) record for a specified
    user.

    Format

      SYS$SETUAI  [nullarg] ,[contxt] ,usrnam ,itmlst ,[nullarg]

                  ,[nullarg] ,[nullarg]

    C Prototype

      int sys$setuai  (unsigned int efn, unsigned int *contxt, void

                      *usrnam, void *itmlst, struct _iosb *iosb, void

                      (*astadr)(__unknown_params), int astprm);