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

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Message-ID: <Pine.LNX.4.64.0706081229030.5795@alien.or.mcafeemobile.com>
Date:	Fri, 8 Jun 2007 12:37:44 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	Ulrich Drepper <drepper@...hat.com>, Theodore Tso <tytso@....edu>,
	Eric Dumazet <dada1@...mosbay.com>,
	Kyle Moffett <mrmacman_g4@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2

On Fri, 8 Jun 2007, Alan Cox wrote:

> On Fri, 08 Jun 2007 11:43:29 -0700
> Ulrich Drepper <drepper@...hat.com> wrote:
> 
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> > 
> > Alan Cox wrote:
> > > Why does he want an unpredictable algorithm
> > 
> > To avoid exactly the kind of problem we have now in future: programs
> > relying on specific patterns.
> 
> Which you seem to think is a bad thing, yet is actually a very good thing
> because it means that crashes are repeatable and problems are debuggable
> from end user reports.
> 
> Trying to randomize filehandles for the general case is not a productive
> activity. If you want to debug cases write yourself a glibc wrapper that
> does annoying things but don't inflict it on people who actually want to
> build working, testable, debuggable systems (ie most of us)

So, what do you plan to do? Those handle won't be zero-based. Your 
"working" system I immagine will do:

	bleeh[handle - BASE].duh = ...;

How nice for a working system. If you *store* the handle returned by the 
OS, and you *use* the handle to call for OS services, you will be fine 
independently from the value handed out by the OS.



- Davide


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