AW: Directory /proc/xenomai/registry/rtipc/xddp does not exist

Jona Ostermann Jona.Ostermann at
Wed Apr 1 11:38:55 CEST 2020

Hello Jan,

our customer still has some problems creating this link.
They were using Xenomai 2 before and now have switched to Xenomai 3.1.

They were using the function rt_pipe_create in Xenomai 2, is there anything different in Xenomai 3?

We have set the following kernel configuration für XDDP:


Is there anything else needed?

Best Regards

-----Ursprüngliche Nachricht-----
Von: Jona Ostermann 
Gesendet: Dienstag, 31. März 2020 16:03
An: 'Jan Kiszka' <jan.kiszka at>; xenomai at
Betreff: AW: Directory /proc/xenomai/registry/rtipc/xddp does not exist

Hello Jan,

thank you, you are correct.
Using the xddp-label demo tool the link is created.
So it is an application error and not a Xenomai configuration error.

Best regards

-----Ursprüngliche Nachricht-----
Von: Jan Kiszka <jan.kiszka at> 
Gesendet: Freitag, 27. März 2020 10:07
An: Jona Ostermann <Jona.Ostermann at>; xenomai at
Betreff: Re: Directory /proc/xenomai/registry/rtipc/xddp does not exist

On 26.03.20 11:12, Jona Ostermann via Xenomai wrote:
> Hello,
> one of our customers hast he problem that he needs a registry link in the directory /proc/xenomai/registry/rtipc/xddp.
> But the directory does not exist, only /proc/xenomai/registry/ exists.
> What could be the problem?
> Is a special kernel configuration required or does a special kernel module need to be loaded?

The links show up once xddp is being used. You can check that via smokey's xddp test.

If that is not the case, compare configuration and versions of the reference xenomai-images against your setup and share your findings.


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