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Date: Sat, 16 Dec 2000 00:47:14 +0100
From: Werner Almesberger <Werner.Almesberger@epfl.ch>
To: "J . A . Magallon" <jamagallon@able.es>
Cc: lkml <linux-kernel@vger.kernel.org>
Subject: Re: Linus's include file strategy redux
Message-ID: <20001216004714.V573@almesberger.net>
In-Reply-To: <20001215152137.K599@almesberger.net> <NBBBJGOOMDFADJDGDCPHAENMCJAA.law@sgi.com> <20001215222117.S573@almesberger.net> <20001215234857.A689@werewolf.able.es>
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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

-- 
  _________________________________________________________________________
 / Werner Almesberger, ICA, EPFL, CH           Werner.Almesberger@epfl.ch /
/_IN_N_032__Tel_+41_21_693_6621__Fax_+41_21_693_6610_____________________/
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