Things like SIOCDEVPRIVATE are regularly used to pass data with pointers to
other data.
> > For the standard form the existing ioctls encode their size.
> Except that there are tons of legacy ioctls that don't ...
Yep. But we are stuck with those. Hindsight is a glorious thing.
> > size for the copy it has no code size improvement
>
> Code size?! I see no reason to even think about that in this context.
Always think about code size and speed.
> > devicecontrol in the form you give has no value outside a message passing
> > microkernel.
>
> Somehow, my memory tells me that people (including Linus) liked something
> very similar a short time back ...
Maybe, but I dont 8)
Alan
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