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Date: Mon, 18 Mar 2002 13:46:12 -0500 (EST)
From: David E Euresti <davie AT MIT DOT EDU>
To: <cygwin AT cygwin DOT com>
Subject: sendmsg problems
Message-ID: <Pine.GSO.4.30L.0203181345440.14706-100000@magic-pi-ball.mit.edu>
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Content-Type: TEXT/PLAIN; charset=US-ASCII


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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