(usagi-users 03427) Re: select() bug on IPv6 multicast SSM socket.

[Hoerdt Mickael <hoerdt@xxxxxxxxxxxxxxxxxxxxx>]

Ok, I had stupid cute and paste fault in testselect(). Now it works good.

I will investigate further then

Hoerdt Mickaël

Hoerdt Mickael wrote:

>Ok the proof of the bug is now there :
>
>1. download http://clarinet.u-strasbg.fr/~hoerdt/testselect.tgz
>2. compile it (make).
>
>This code contains testselect.c which :
>    a. create two sockets so1 and so2, bind them and register them to
>the same SSM
>        channel.
>    b. launch select() on the two sockets and print when data arrive.
>
>by  default it register to the channel 2001:1::1 ff3e::1234, thats a
>constant that you can
>change. The behavior observed on my box is the following :
>
>./test_select
>2 multicast sockets ready for reading
>so1 have data
>so2 have data
>1 multicast sockets ready for reading
>so2 have data
>1 multicast sockets ready for reading
>so2 have data
>1 multicast sockets ready for reading
>so2 have data
>1 multicast sockets ready for reading
>so2 have data
>
>As you  can observe, the first packet is well received, but the others
>only arrive
>at one socket.  I know that it is a very specific particular case, but I
>need to have
>this in my application (receiving on both sockets), because in my
>application the
>set of channels joined by sockets may be different over time.
>
>Thanks,
>
>Hoerdt Mickaël
>
>
>
>
>
>
>
>Stig Venaas wrote:
>
>  
>
>>On Thu, Jun 23, 2005 at 09:35:15AM +0200, Hoerdt Mickael wrote:
>> 
>>
>>    
>>
>>>Hi,
>>>
>>>I have strange behavior in my code :
>>>
>>>I got two IPv6 UDP sockets, bound to the same port and listening to the
>>>same SSM channel (INCLUDE mode). I am using select() to know when packets are coming on it. The
>>>thing is that only one socket receive packets is it normal ? does multicast
>>>toward sockets bound
>>>to the same port and listening to the same group works ?
>>>   
>>>
>>>      
>>>
>>It works fine for me on 2.6.11 (without usagi) and also has before.
>>Is your problem with select(), does select only include one of the
>>sockets in the read set? Or are you indeed not receiving packets?
>>
>>I only tested ASM though,
>>
>>Stig
>>
>>
>> 
>>
>>    
>>
>
>
>  
>