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From: Philippe Gerum <rpm@xenomai.org>
Message-ID: <565047BC.2010101@xenomai.org>
Date: Sat, 21 Nov 2015 11:30:20 +0100
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Subject: Re: [Xenomai] registry
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To: Mathieu Rondonneau <mathieu_rondonneau@hotmail.com>, xenomai@xenomai.org

On 11/21/2015 06:53 AM, Mathieu Rondonneau wrote:
> Hi,
> 
> When a skin (lets say vxworks for example) does a
> registry_add_dir("/vxworks"), where this directory gets created?
> 
> I can see the registry as follow:
> /var/run/xenomai/root/
> /var/run/xenomai/system/heaps
> /var/run/xenomai/system/threads
> /var/run/xenomai/system/version
> 
> This is how I started the registry:
> sudo ./sysregd --linger --daemonize --anon --root=/var/run/xenomai
> 
> so I was expecting to be able to find a directory as follow:
> /var/run/xenomai/anon/<pid>/vxworks

Nope. A registry spawned manually from the command line is supposed to
manage a session shared between several application processes. --anon is
an internal switch used by copperplate aimed at starting a private
session for the current process, when it does not want to share anything
with other processes. You should not use this switch directly.

--root should be the path of the top directory for the session, so
/var/run/xenomai won't work since this is the default root for all sessions.

> 
>>>From my test app, I have tried to find the directory in those locations
> with no luck:
> /var/run/xenomai/<pid>/vxworks
> /var/run/xenomai/vxworks

If starting the sysregd daemon is left to copperplate, that would be:

/var/run/xenomai/<user>/<session-label>/<pid>/vxworks

When the session is anonymous, <session-label> is "anon@<pid>".

If you start the daemon manually from the command line, --root should
specify the session directory, and the vxworks tree below would be
located at:

<session-top-dir>/vxworks

> 
> Now I think I am missing a setup somewhere.
> 

lib/{alchemy,psos,vxworks}/init.c illustrate this. --enable-registry
should be passed to the configure script.

-- 
Philippe.