Re: [patch 7/8] fdmap v2 - implement sys_socket2

[Davide Libenzi]

On Fri, 8 Jun 2007, Alan Cox wrote:

> On Fri, 08 Jun 2007 11:43:29 -0700
> Ulrich Drepper <drepper@xxxxxxxxxx> 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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