On Friday 07 December 2007 13:34:07 David Miller wrote:
> From: Michael Buesch <mb@xxxxxxxxx>
> Date: Fri, 7 Dec 2007 12:35:11 +0100
>
> > So, how do we handle unaligned data in userspace then?
> > A _lot_ of applications are broken if that's right what you say.
>
> Applications make sure data is always properly aligned, that's how
> it's handled. I don't see what the big mystery is. :-)
That's not always possible. For example if we are handling
some kind of wire protocol data.
let's give you some real world example: b43-fwcutter
The wire protocol for the iv files is the following structure:
struct b43_iv {
be16 a;
union {
be16 x;
be32 y;
} ((attr_packed));
} ((attr_packed));
How do I handle that in userspace? In kernel space it's simple
(and we already use get_unaligned() for the 32bit value there).
--
Greetings Michael.
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