__svc_add_to_xlist
if (!__svc_add_to_xlist(&dxlist, xprt, NULL)) {
if (!__svc_add_to_xlist(&_svc_xprtlist, xprt,
extern bool_t __svc_add_to_xlist(SVCXPRT_LIST **, SVCXPRT *, mutex_t *);