Re: [Xenomai-help] CAN rt_dev_recvfrom

[Roland Tollenaar <rwatollenaar@domain.hid>]

Hi Wolfgang,

>> Can this be confirmed or is rt_dev_recvfrom() behaving incorrectly in 
>> my case?
> 
> rt_dev_recvfrom() reads message frames (one at a time) from an internal 
> socket buffer (there is actually a kernel configuration option to 
> configure the size). If no messages are available, it will block by 
> default, but it can also be used in non-blocking mode by using the flag 
> MSG_DONTWAIT. It seems, that your application is trying to read messages 
> periodically in polling mode. Either you do reading and buffering in 
> your own thread as you suggested above or you use rt_dev_recvfrom() in 
> non-blocking mode.

Thanks for this. I have not tried it yet but I was looking for that flag 
in the hope that something like this would exist. I thought I had seen 
something like it but when I tried to locate it yesterday I failed. 
Don;t worry it is there, I just checked. Sorry.

Where can I find the buffer size option in the kernel config menu? What 
is the default size?

Thanks again.

Roland

> 
> Wolfgang.
> 
>