Messages in this thread | | | From | Marcus Metzler <> | Date | Wed, 25 Jun 2003 20:43:23 +0200 (CEST) | Subject | Re: DVB Include files |
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Christoph Hellwig writes: > On Wed, Jun 25, 2003 at 08:09:51PM +0200, Marcus Metzler wrote: > > > If the structures change incompatibly you're fucked anyway. Better > > > > Not necessarily, e.g. changing > > > > #define AUDIO_SET_ATTRIBUTES _IOW('o', 17, audio_attributes_t) > > #define AUDIO_SET_KARAOKE _IOW('o', 18, audio_karaoke_t) > > > > to > > > > #define AUDIO_SET_ATTRIBUTES _IOW('o', 47, audio_attributes_t) > > #define AUDIO_SET_KARAOKE _IOW('o', 48, audio_karaoke_t) > > > > or > > In that case yes, you are screwed. Your ABI just changed incompatibly.
Not if you recompile.
> > > Anyway, even in user/include it should be under linux/dvb because > > that's just what it is Linux DVB. So the app has to include > > <linux/dvb/xxx.h>. > > No! <linux/*.h> is the namesapce for kernelheaders. Currently they're > still in the the user includes, too (due to legacy reasons). The > DVD API must move to a directory outside <linux/dvb>. >
Why (It's DVB by the way)? It's as close to the kernel as ls or cat and having two sets of the same includes is stupid.
> If you userland packages add headers to /usr/include/linux/ they > are totally bogus. >
What packages? You are always talking about packages. There are no packages. There are only the kernel and my app. Nothing else. No copying of headers.
> > I don't care what distributions do. When I get a new kernel (no > > packages), I use the includes from that kernel and compile my apps > > with that. > > And that's wrong. You must always compile against the kernel headers > that your libc was compiled against. >
There is no one who does that, not even distributions. The includes needed for libc are far less prone to change than v4l or dvb. And not as linux specific.
I see your point, but right now it's only academic and not practicable.
Marcus
-- /--------------------------------------------------------------------\ | Dr. Marcus O.C. Metzler | | |--------------------------------|-----------------------------------| | mocm@metzlerbros.de | http://www.metzlerbros.de/ | \--------------------------------------------------------------------/
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