sotoxsocket
sotoxsocket(unp->unp_socket, &xu->xu_socket);
sotoxsocket(inp->inp_socket, &xi->xi_socket);
sotoxsocket(dcb->dcb_socket, &xi.xi_socket);
sotoxsocket(ssk->socket, &xt.xt_inp.xi_socket);
void sotoxsocket(struct socket *so, struct xsocket *xso);
int sotoxsocket(struct socket *, struct xsocket *);
if (sotoxsocket(&so, &xu.xu_socket) != 0)