o ((flags & IF_CHANGE_UP) == IF_CHANGE_UP) -> (flags & IF_CHANGE_UP)
o bcopy -> memcpy (bcopy is unportable)
o Ifdeffed out add_tail(&(ifa->sk_list),NODE mcsk) -- the node in socket
structure is for internal use by the resource manager only. (Now, the
debugging dump of open sockets looks sane :-)).