linux-kernel - Re: [patch 7/8] fdmap v2

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Message-ID: <alpine.LFD.0.98.0706101022180.20321@woody.linux-foundation.org>
Date:	Sun, 10 Jun 2007 10:23:43 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@....linux.org.uk>
cc:	dean gaudet <dean@...tic.org>, Kyle Moffett <mrmacman_g4@....com>,
	Ulrich Drepper <drepper@...hat.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Theodore Tso <tytso@....edu>,
	Eric Dumazet <dada1@...mosbay.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2



On Sun, 10 Jun 2007, Al Viro wrote:
> 
> On FreeBSD it will simply give you zero st_ino on almost all sockets;
> AF_UNIX ones get st_ino invented (and stable).  st_dev is NODEV in all
> cases...

So it will still work better than trying to do a "getsockname()" or 
something. If the file descriptor really _has_ been changed, it might give 
a false negative (somebody replaced it with *another* socket), but on the 
other hand, that's much better than a false positive. And if somebody 
replaced the socket with a real file descriptor, it will catch it..

		Linus
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