sendmsg problems

[David E Euresti <davie at MIT dot EDU>]

So I'm trying to work out a way to have socket passing using
DuplicateHandle.  Unfortunately I don't think that sendmsg works
correctly.

I use socketpair to create a pair of connected Unix Domain sockets. Then I
fork. Then I create a socket which I want to pass to the child. But when I
call sendmsg on the original socketpair thing it returns -1, a Bad
Address.  I don't set msg_name in the msghdr because the socket is already
connected.

So I went into the sources and sure enough sendmsg is implemented by
calling sendto using the msg_name that's being passed, and since message
name is null the call dies.

I know that calling sendmsg, on a socketpair after a fork, with no name
works on Unix.  Is there any way around this?

Thanks,
David Euresti



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