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Date: Mon, 3 Jun 2002 16:59:31 -0400
From: Christopher Faylor <cgf-noreply AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Duplicating Unix Domain Sockets
Message-ID: <20020603205931.GC28699@redhat.com>
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References: <Pine DOT GSO DOT 4 DOT 30L DOT 0206031633540 DOT 3061-100000 AT department-of-alchemy DOT mit DOT edu>
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On Mon, Jun 03, 2002 at 04:47:49PM -0400, David E Euresti wrote:
>Allright.  So I have two solutions.
>(And tell me if I should direct this to the folks at cygwin-devel)
>
>#1
>Make cygwin be able to implement the Ancillary data as in 4.3+BSD as
>described in section 15.3.3 in Advanced Programming in the Unix
>Environment.
>
>To implement this, I would tag all messages sent on Unix domain sockets
>with a tag like this:
>struct tag {
>	int adatalen; // Length of ancillary data
>	int rdatalen; // Length of real data
>}
>
>Then when you receive it your first read the tag and if there is ancillary
>data read it and do what you need to do (convert the info into an fd) and
>then read the rdatalen.  If there is more rdatalen than the length of
>buffer sent to you, you return what you can, and remember how much is
>left.
>
>This is obviously a big task, and opinions would be quite welcome.

Sounds like it would slow down every UNIX domain socket read.

I'll let Egor comment on this, though.  It's his code.

cgf

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