Re: Details about DVB frontend API

[Mauro Carvalho Chehab <mchehab@infradead.org>]

Michael Krufky wrote:
> On Fri, Dec 4, 2009 at 3:02 PM, VDR User <user.vdr@gmail.com> wrote:
> I have stated that I like Manu's proposal, but I would prefer that the
> get_property (s2api) interface were used, because it totally provides
> an interface that is sufficient for this feature.
> 
> Manu and I agree that these values should all be read at once.
> 
> I think we all (except Mauro) agree that the behavior within the
> driver should fetch all statistics at once and return it to userspace
> as a single structure with all the information as it all relates to
> each other.

You're contradicting yourself: by using S2API, the userspace API won't
be using a single structure, since S2API will break them into pairs of
attributes/values.

Nothing limits that the in-kernel API will group those values into a struct,
but the internal API should be smart enough to not return to userspace
the values that weren't requested by the call.

Cheers,
Mauro.