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Does it really require wrapping sockaddr?  It seems that returning an opaque string containing the data returned by getsockaddrarg that can be passed to the new connect_arw (or whatever) is sufficient.  There doesn't need to be any way to access/mess with the data in this string, since its format is whatever the underlying unix utilities return, and varies by socket address family, etc, but it only needs to be able to be passed blindly to connect.  

Anyway, I would be glad to provide a patch to provide the other routines.