[Xenomai-help] Re: [Socketcan-users] send error: permission denied

[Wolfgang Grandegger <wg@domain.hid>]

Hi Daniel,

Daniel Schnell wrote:
> Hi,
> 
>  
> 
> I am new to socket can.
> 
>  
> 
> I wanted to test the rtcan driver in combination with Linux and Xenomai 
> and made a little program according to the rtcansend program but with 
> some response time measurements.
> 
>  
> 
> However after setting up the socket I get –EPERM when trying to send a 
> packet to the can device. As the documentation doesn’t state anything 
> about this error when calling rt_dev_send() I wonder why the error if at 
> all doesn’t appear earlier if I try to setup the socket. The test 
> program already ran nicely when I tested the peak can drivers for linux. 
> I just changed the driver specific calls.
> 
>  
> 
> Attached you find the complete test file, the function task() is the one 
> to blame.
> 
>  
> 
> I am a bit stuck with this, so maybe someone can give me a slight hint 
> in what i am doing wrong.

I tried your program on my system and got the same error. The problem 
is, that rt_dev_send() is called from non-RT context, which is illegal.
At a first glance, it's not obvious to me why. Therefore I added the 
Xenomai Help ML to the CCs.

Wolfgang.