xdrs
    A pointer to an XDR stream handle created by one of the XDR
    stream-handle creation routines.
 rpp
    A pointer to a pointer to a pmaplist structure containing a
    list of Portmapper programs and their respective information.
    If the routine is used to decode a Portmapper listing, it sets
    rpp to the address of a newly allocated linked list of pmaplist
    structures.