rtems-libbsd bpf BIOCSRTIMEOUT behaviour

[Sebastian Huber]

On 28/06/18 14:09, Nicolas Tsiogkas wrote:
> Hi,
>
> I have observed a weird behaviour while setting the BIOCSRTIMEOUT for 
> a bpf.
>
> When setting it to low values (less than a second) as it can be seen 
> below the bpf is actually blocking instead of waiting and continuing.
>
> struct timeval timeout;
> timeout.tv_sec =  0;
> timeout.tv_usec = 1;
> if (ioctl(*bpf, BIOCSRTIMEOUT, &timeout) == -1) {
> perror("BIOCSRTIMEOUT");
>   return 0;
> }
>
> This was working with the libbsd 4.11 branch. Is this a known bug?

No, we use the bpf with libpcap on the master. You have to debug this.

>
> In addition the bpf is not receiving/reading anything incoming while 
> with wireshark I can confirm that there are things on the wire and the 
> bpf is in promiscuous mode. Still this was working on the 4.11 branch. 
> Any idea on how to debug this?

I would set a break point to the network interface receive function and 
then follow the path of the Ethernet frame.

>
> Thanks in advance.
>
> Cheers,
> Niko
>
>
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-- 
Sebastian Huber, embedded brains GmbH

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