From: Eric Rubin <erubin@...>
Date: 2007-12-08T05:40:03+09:00
Subject: Re: winxp multicast socket reading problem

I ran into this same problem and finally discovered that in Windows you
have to call bind before setsockopt.  This gets rid of the
"setsockopt:Invalid argument(EINVAL)" message.

Eric Rubin

Akif Tokuz wrote:
> 
> Hi
> 
> I am trying to read some data from a multicast address. So I googled and
> found this example.
> 
> require 'socket'
> require 'ipaddr'
> 
> MULTICAST_ADDR = "225.4.5.6"
> PORT = 5000
> 
> ip =  IPAddr.new(MULTICAST_ADDR).hton + IPAddr.new("0.0.0.0").hton
> 
> sock = UDPSocket.new
> sock.setsockopt(Socket::IPPROTO_IP, Socket::IP_ADD_MEMBERSHIP, ip)
> sock.bind(Socket::INADDR_ANY, PORT)
> 
> loop do
>   msg, info = sock.recvfrom(1024)
>   puts "MSG: #{msg} from #{info[2]} (#{info[3]})/#{info[1]} len
> #{msg.size}"
> end
> 
> But it didnt work again. Now it says
> error on setsockopt:Invalid argument(EINVAL)
> 
> What could be the problem?
> 
> Thanks in advance.
> 
> Akif,
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