xdr_array
extern bool_t xdr_array(XDR *, char **, unsigned int *, unsigned int,
__weak_alias(xdr_array,_xdr_array)
xdr_array(XDR *xdrs, char **addrp, u_int *sizep, u_int maxsize, u_int elsize,
&& xdr_array(xdrs, (char **)(void *)&(p->aup_gids),