linux-kernel - Re: [PATCH] sctp: if backlog is 0, listening shall not be deactivated.

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Message-ID: <496E0A73.9030903@hp.com>
Date:	Wed, 14 Jan 2009 10:53:23 -0500
From:	Vlad Yasevich <vladislav.yasevich@...com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Pierre Habouzit <pierre.habouzit@...ersec.com>,
	Wei Yongjun <yjwei@...fujitsu.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sctp: if backlog is 0, listening shall not be deactivated.

Alan Cox wrote:
>> SCTP API simply chooses to ignore the "may".  It is still fully compliant
>> with POSIX in this regard.
> 
> Linux chooses the interpretation that zero means one connection. Having a
> single protocol variant do different things is not nice because  a lot
> of code is designed to handle multiple address families and expect the
> same non address handling behaviour.
> 
> So while it may be able to claim posix compliance, its not Linux
> behaviour, and its relying on a specific interpretation of posix not
> being used by the OS.
> 
> At the very least the current behaviour of the SCTP code is plain rude.
> 

I will submit a requirest to change this behavior in the spec, but I am not
terribly optimistic.  This has been specified for a very long time and there
might be applications taking advantage of the ability to shut listing off.

At this time, let's leave this as is.  A well written application should specify
the listen backlog anyway, otherwise it's depending on the "may" language in the
Posix spec and will not get consistent behavior across different systems.

-vlad
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