Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sources.redhat.com/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sources.redhat.com/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com
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>
MIME-Version:	1.0

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



--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Bug reporting:         http://cygwin.com/bugs.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/

- Raw text -