if_addmulti
error = if_addmulti(ifp, (struct sockaddr *)&sdl, &rifma);
error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
error = if_addmulti(ifp,
int if_addmulti(if_t, struct sockaddr *, struct ifmultiaddr **);
error = if_addmulti(ifp_p, (struct sockaddr *)&mc->mc_addr,
error = if_addmulti(priv->ifp,
error = if_addmulti(ifp, (struct sockaddr *)&gsin, &ifma);
error = if_addmulti(ifp, (struct sockaddr *)&gsin6, &ifma);
retval = -if_addmulti(ndev, &addr._sockaddr, NULL);