[Gllug] Open Ports

[Chris Bell]

On Mon 28 Jan, tet at accucard.com wrote:
> 
> 
> >> Bleugh! Sorry, pet hate of mine. Config files should never contain
> >> negative options. This should be "enable = no". Poor interface design.
> >
> >I see no logical reason for this.  The normal reason to write up a 
> >service in  xinetd.conf is to enable it - to disable it simply don't 
> >include it.  The default is for a service to be enabled, so it makes 
> >sense to add a disable line for the exceptions rather than having to add 
> >an enable line to all the others.
> 
> The whole reason for avoiding negative options is to increase clarity,
> by avoiding double negatives. Thus, even if it's optional, using
> "enable = no" is still better than "disable = yes".
> 
> xinetd is far from the only guilty party here. The Linux kernel itself
> does the same. "Disable NAGLE algorithm?" should instead be "Enable
> NAGLE algorithm?" and should default to yes, for example.
> 
> The worst offender for this, though, was a Windows 3.11 app I once saw
> (I can't even remember it's name now), which had a check box labelled
> "don't disable foobar". If that was unchecked, then you have a triple
> negative to try and express what you want to do. True, we're not
> talking about anything that extreme here, but the same principle
> applies.
> 
> Tet
> 
   I would suggest that you don't even look at how your computer works,
there is plenty of multiple negative logic in there because the binary
signals need to be enabled or disabled (held either at 0 or 1) by
combinations of other binary signals. Binary logic gates come in all
possible combinations, and are then interconnected to produce the complex
circuit elements.

-- 
Chris Bell


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