[Xenomai] doc for xeno-config skins

Giulio Moro g.moro at qmul.ac.uk
Thu Apr 5 13:39:14 CEST 2018

Thanks and sorry for overlooking that. I thought if there was some docs on xeno-config it would have been inlined in its source, so that is where I looked for it. I guess the man folder should have been a more obvious choice.

Is it correct that calling `xeno-config --skin cobalt` expects you to call, POSIX functions prefixed with `__wrap_` ? Does this mean that the *actual* "Cobalt POSIX interface" consists of __wrap_fn() calls as opposed to fn() calls?
If yes,  is this documented somewhere obvious? I kind of figured this out over time by reading http://xenomai.org/2014/08/porting-a-linux-application-to-xenomai-dual-kernel/  and looking at the wrappers files and at the source code, but is it stated clearly somewhere? 
This is a place where I would have looked for that, for instance: http://www.xenomai.org/documentation/xenomai-3/html/xeno3prm/group__cobalt__api.html .

(incidentally, these two images (referenced by the xeno-config man page) are missing

From: Philippe Gerum <rpm at xenomai.org>
Sent: 05 April 2018 07:36
To: Giulio Moro; xenomai at xenomai.org
Subject: Re: [Xenomai] doc for xeno-config skins

On 04/04/2018 10:15 PM, Giulio Moro wrote:
> What is the difference between the Posix and Cobalt skin, as far as xeno-config is concerned??
> Difference between
>   xeno-config --skin posix --cflags
>   xeno-config --skin cobalt --cflags
> is that the former declares -D__COBALT_WRAP__ (which in turn adds fwd declarations for clock_nanosleep() and pthread_setname_np() in boilerplate/libc.h).
> difference between
>   xeno-config --skin posix --ldflags
>   xeno-config --skin cobalt --ldflags
> is that the former adds `-Wl,@/usr/xenomai/lib/cobalt.wrappers`
> So it seems to me that `--skin posix` expects you to call, e.g.: pthread_create(), while `--skin cobalt` expects you to call, e.g.: __wrap_pthread_create()
> Is this correct?
> Is that it?
> What are the intended uses?
> I don't think this is documented anywhere? Where would be the best place to have this written down? Perhaps the --help of xeno-config? Also, while we are at it, --skin alchemy vs --skin native and the effect of --compat could use some description.



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