Re: [Xenomai] [RFC] Xenomai3 tuneables replaced by environment variables

["Stéphane Ancelot" <sancelot@numalliance.com>]

Hi,

hardcoded and cmdline args benefits from an added value for real 
applications. We don't want args being "volatile"

environment variables are volatile and sometimes difficult to propagate 
between shells...

Regards,

S.Ancelot


Le 08/08/2017 à 11:23, Henning Schild a écrit :
> Hey,
>
> xenomai3 has its tuneables and they can be set with command-line
> parameters and setup_descriptors.
>
> 1.
> The command-line parameters impose on the application, it has to be
> modified to skip/ignore them. And ultimately it has to keep a list of
> valid ones to do so pedanticly. If there are name clashes behaviour is
> unclear. i.e. "--help" ld.so vs. dlopen
>
> 2.
> The setup_descriptors do work but they rely on getting the order
> stricly right. They have to execute before the first xenomai_init(). In
> complex applications with multithreaded init using dlopen() and
> auto-init-solib that quickly turns out to be unusable.
>
> Suggestions:
> 1.
> 1.1 completely drop the support for parameters and the fiddling
>      with /proc/cmdline
> 1.2 or agree on a prefix "--xeno-" so the application can ignore all
>      xenomai parameters without knowing all
>
> 2.
> 2.1 completely drop the setup_descriptors in favour of environment
>      variables
>
> That would be a drastic change but i think we should do something about
> it. With environment variables it is clear what happens without messing
> with the applications init or parameters, getting rid of confusing
> complexity.
>
> Please let me know what you think, i would be happy to prepare patches.
>
> Henning
>
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