Re: [Xenomai-help] Invalid characters in task's names

[Philippe Gerum <rpm@xenomai.org>]

Ignacio García Pérez wrote:
> Hi,
> 
> I just noticed "/" is not a valid character for a task's name. Probably
> something to do with the clever use that xeno makes of the /proc
> filesystem.:
>

It's strictly /procfs related, yes.

> 1- Are there any other "forbidden" characters?

No.

> 
> 2- Does this limitation apply to the other named objects?
> 

Yes. Everything that goes through the registry support.

> 3- Shouldn't those characters be internally escaped somehow to overcome
> this limitation?
> 

At some point in time, especially the day we add distributed computing 
facilities, we could find an interesting use of this single reserved character 
to express object hierarchies too.

> 4- If (2) is not possible, shouldn't this limitation be mentioned in the
> API documentation.
> 

It is actually. Excerpt from rt_registry_enter()'s documentation:

  * - -EINVAL is returned if @a key or @a objaddr are NULL, or if @a
  * key constains an invalid '/' character.

The connection between any object creation routine and the registry is clearly 
stated throughout the documentation, but the indirect use of rt_registry_enter 
might not be explicitely mentioned though.

> Thanks.
> 
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-- 

Philippe.