Re: [Xenomai-help] writing from user space through fifo problems

[Jan Kiszka <jan.kiszka@domain.hid>]

[-- Attachment #1: Type: text/plain, Size: 1026 bytes --]

NZG wrote:
> I've got 2 programs, one Xenomai user space real time thread and one normal 
> user space program.
> 
> My normal user space is trying to pass a structure to my real time program and 
> failing.
> 
> my RT thread reads in a 1ms loop with:
> err = rt_pipe_read(control_pipe,k,sizeof(control_t),TM_NONBLOCK);
> 
> my regular linux program writes a real time fifo with:
> 
> int fd = open(dev, O_WRONLY|O_SYNC);
> err = write(fd,&c,sizeof(c));
> if(err<=0)error(0,-err, "write failed  with %d",err);
> close(fd);
> 
> The user space program succeeds (write returns no error and doesn't block), 
> but the RT thread never see's the data, continually returning -EINTR.

Are you sure it is EINTR? A first glance at the possible code path,
specifically at xnpipe_recv, suggests that you cannot reach the line
returning this error code if TM_NONBLOCK was passed.

What Xenomai version are we talking about BTW? And, as usual:
self-contained simple test cases are always appreciated. :)

Jan


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 254 bytes --]