[Bug 217637] One TCP connection accepted TWO times

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217637

--- Comment #68 from Michael Tuexen <tuexen at freebsd.org> ---
(In reply to slw from comment #67)
> Loss of sended application data caused by close() before incoming user
> data arrived? Realy? TCP don't have such claim.
Hmm. My understanding is that TCP provides a reliable bi-directional
byte-stream.
This means that no user data is lost in any of the two directions.
> No problem. This is not application data.
For me it doesn't matter in which direction user data is dropped. If that
happens,
TCP fails.
> I am not afraid about user data, I am afraid about server data.
> Server data lost and this is problem.
> No problem about lose user data.
I don't agree. TCP does not provide a service which is reliable in one
direction and
unreliable in the other. If user data is dropped, the connection failed.

RFC 793 only talks about the CLOSE primitive, which shuts down only the writing
direction, not the reading one. This is not related to the close() call, the
program
is using. The problem comes up because the reading direction is shut down. This
is
not described in the RFC. Therefore you have to go back to the high level
description
of the service TCP provides.

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