in_ifinit
error = in_ifinit(ifp, ia, &ifaddr, 1);
if (!(error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0)))
if (!(error = in_ifinit(ifp, ifatoia(ifa), &new_sin, 0)))
error = in_ifinit(ifp, ia, sin, newifaddr);
error = in_ifinit(ifp, ia, sin, newifaddr);
int in_ifinit(struct ifnet *,