[Bug 17195] NamedPipe datagrams need to be _really_ datagrams

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=17195

--- Comment #163 from Adam Martinson <adam.r.martinson at gmail.com> ---
(In reply to Sebastian Lackner from comment #162)
> Moreover we're preparing some kernel patches...

Nice to see somebody working on this again =)  A few notes from my time on
this:

If you need to patch the native kernel to get your implementation to work, it's
probably the wrong way to go.  As you noted I played around with a
SOCK_SEQPACKET implementation, and ditched it because of some of the problems
you've run into.

The reason I implemented message mode through the server is because that's what
AJ suggested.  I think that's probably the easiest & most straightforward way
to do it.

If you're really set on using native pipes/sockets, I would take a look at
encoding the data in a normal stream socket.  Basically save yourself an
end-of-message bit out of each byte, and shift the rest of the data
accordingly.  You'll end up with an overhead of 1 byte per 7 sent, which should
give you acceptable performance.  Zero-length writes would become a single byte
with just that end-of-message bit set.  You'd obviously need to translate
lengths, which should be trivial.

Any questions, etc feel free to send me an email.
~Adam

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