[Xenomai-help] XDDP / IDDP Protocol Documentation

[Xenomai-help] XDDP / IDDP Protocol Documentation

[Guvenc Gulce]

Hi 
Starting with Xenomai 2.5.x, there are couple of protocols which can be used by the rt threads for IPC 
purposes. I am playing with the xddp protocol. Apart from the examples in xenomai source tree and an 
e-mail from Philippe in xenomai-core mailing list, I couldnt find any further documentation. Do I overlook 
smt here ? Are there any other pointers which document these protocols with further details ?

The API is actually Posix - Socket based so the usage is pretty straightforward but it would be nice 
to have a list of accepted parameters for setsockopt call and what they are doing and maybe the accepted 
values of "flags" parameter which can be used for example with recvfrom() call ? It would be more comfortable 
then digging in the xenomai source code.

And in order to ask a particular question:

Any idea how to make recvfrom() call non-blocking in xddp context ? seems to be blocking per default.

Thanks & Regards

Guvenc


      

Re: [Xenomai-help] XDDP / IDDP Protocol Documentation

[Philippe Gerum]

On Thu, 2010-02-18 at 06:15 -0800, Guvenc Gulce wrote:
> Hi 
> Starting with Xenomai 2.5.x, there are couple of protocols which can be used by the rt threads for IPC 
> purposes. I am playing with the xddp protocol. Apart from the examples in xenomai source tree and an 
> e-mail from Philippe in xenomai-core mailing list, I couldnt find any further documentation. Do I overlook 
> smt here ? Are there any other pointers which document these protocols with further details ?
> 
> The API is actually Posix - Socket based so the usage is pretty straightforward but it would be nice 
> to have a list of accepted parameters for setsockopt call and what they are doing and maybe the accepted 
> values of "flags" parameter which can be used for example with recvfrom() call ? It would be more comfortable 
> then digging in the xenomai source code.

Likely yes. But no doc avail yet, aside of the demo code from
examples/rtdm/profiles/ipc.

> 
> And in order to ask a particular question:
> 
> Any idea how to make recvfrom() call non-blocking in xddp context ? seems to be blocking per default.
> 

MSG_DONTWAIT should be set in flags.

> Thanks & Regards
> 
> Guvenc
> 
> 
>       
> 
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-- 
Philippe.