>> Is this format for 'request' enforced anywhere in NetBsd, or is
>> it just a convention?
>
>Well, this is used to copy the argument between kernel and user space. So
>if you don't follow it, be sure to mark the ioctl as IOC_VOID.
>
>I am not sure what you are trying to achive, but it sounds like an ugly
>and unnecessary hack.

well...it could also be a feature.  :)

otoh, you could pass, as the third argument to ioctl, a pointer to a
struct iovec (as an example) and then do more copyin()/copyout()
elsewhere completely independently of the ioctl() mechanism.  sort of
like pointers to pointers...

just a thought...

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