From mboxrd@z Thu Jan  1 00:00:00 1970
References: <20170808112357.0063d74d@md1em3qc>
From: =?UTF-8?Q?St=c3=a9phane_Ancelot?= <sancelot@numalliance.com>
Message-ID: <00264fd7-9cdd-afe0-0047-db7e0c2e8f40@numalliance.com>
Date: Mon, 28 Aug 2017 08:25:02 +0200
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Subject: Re: [Xenomai] [RFC] Xenomai3 tuneables replaced by environment
 variables
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To: Henning Schild <henning.schild@siemens.com>, xenomai@xenomai.org
Cc: "KISZKA, JAN" <jan.kiszka@siemens.com>

Hi,

hardcoded and cmdline args benefits from an added value for real=20
applications. We don't want args being "volatile"

environment variables are volatile and sometimes difficult to propagate=20
between shells...

Regards,

S.Ancelot


Le 08/08/2017 =C3=A0 11:23, Henning Schild a =C3=A9crit :
> 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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