J . A . Magallon wrote:
> Easier: public kernel interfaces only work through pointers.
Requires more elaborate wrappers or a new layer of wrapper functions
around system calls, if you want to make this completely general.
Also, doesn't provide FOOSIZE to "public" space.
> Too kind-of-classroom-not-real-world-useless-thing ?
I'm afraid so ...
I don't think there are many opaque types where there's no trival
solution. Actually, I don't think there are many opaque types at
kernel APIs to start with. The one I know offhand is atm_kptr_t
in include/linux/atmapi.h, in this case, there's little risk in
exposing the internal structure.
So I'd consider opaque types more as a hypothetical obstacle.
- Werner
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/ Werner Almesberger, ICA, EPFL, CH [EMAIL PROTECTED] /
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