vaccess
error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
if (vaccess(p->v_access, READ))
if ((p = vlookup(s)) && vaccess(p->v_access, READ)) {
static int vaccess(int, int);
if (!vaccess(p->v_access, (unsigned int)WRITE)) {