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comp.lang.ruby

winxp multicast socket reading problem

akifusenet

9/7/2007 10:52:00 AM


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



It turned out that one-click installer for WinXp(ruby 1.8.6 (2007-03-13
patchlevel 0) [i386-mswin32]) has a bug on Socket::Constants and
Socket::IP_ADD_MEMBERSHIP is not defined.

As explained in
http://rubyforge.org/tracker/?func=detail&group_id=167&aid=9438&am...

I added this line
Socket::IP_ADD_MEMBERSHIP = 12 unless
socket.const_defined?('IP_ADD_MEMBERSHIP')
to the top of my code.

But it didnt work again. Now it says
error on setsockopt:Invalid argument(EINVAL)

What could be the problem?

Thanks in advance.

Akif,
--
Posted via http://www.ruby-....
2 Answers

akifusenet

9/7/2007 11:26:00 AM

0

I tried the same code in Linux. It doesnt give any error. So it has to
be with Windows. Anybody knows how to deal with this?

Thanks.

Akif,
--
Posted via http://www.ruby-....

Eric Rubin

12/7/2007 8:40:00 PM

0

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,
--
Posted via http://www.ruby-....