netdev - Re: [Bug 106241] New: shutdown(3)/close(3) behaviour is incorrect for sockets in accept(3)

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Message-ID: <20151023170900.GX22011@ZenIV.linux.org.uk>
Date:	Fri, 23 Oct 2015 18:09:00 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Casper.Dik@...cle.com
Cc:	Alan Burlison <Alan.Burlison@...cle.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>, stephen@...workplumber.org,
	netdev@...r.kernel.org, dholland-tech@...bsd.org
Subject: Re: [Bug 106241] New: shutdown(3)/close(3) behaviour is incorrect
 for sockets in accept(3)

On Thu, Oct 22, 2015 at 09:50:10PM +0200, Casper.Dik@...cle.com wrote:
> >Sigh...  It completely fails to mention descriptor-passing.  Which
> >	a) is relevant to what "last close" means and
> >	b) had been there for nearly the third of a century.
> 
> Why is that different?  These clearly count as file descriptors.

To quote your own posting upthread (Message-ID:
<201510212033.t9LKX4G8007718@...m101.nl.oracle.com>)

> Well, a file descriptor really only exists in the context of a process; 
> in-flight it is no longer a file descriptor as there process context with 
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> a file descriptor table; so pointers to file descriptions are passed 
> around.

IMO it shows that the wording is anything but clear.  The only way to claim
that it's accurate is, indeed, to declare that the contents of in-flight
SCM_RIGHTS datagram should be counted as file descriptors and that's too
much of a stretch for the reasons you've pointed to.
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