Re: LANANA: To Pending Device Number Registrants

[H. Peter Anvin]

Alan Cox wrote:
> 
> > Wouldn't it be better just to *try* ioctls and see which ones work and
> > which ones don't?
> 
> 1. We have overlaps
> 

1. is of course a problem in itself.  Someone who creates overlapping
ioctls should be spanked, hard.

> 2. I've seen code where people play clever ioctl tricks to deduce a device
> type and it ends up looking like one of those chemistry identification
> charts (hopefully minus do you see smoke ?)
> 
> It should be clean and explicit

Agreed, but "determining type of device" and "determining if interface X
is available on this device" are different operations.  If the latter is
what you want, you want to *explicitly* perform the latter operation.

        -hpa

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