using multicast socket options

["Andrew Patrick" <andrew at calvin dot dgbt dot doc dot ca>]

I am trying to port a UNIX multicast application to Win32 and the 
GNU-Win32 development tools are of interest to me because of the 
familiar environment they provide.

I have run into a problem with the setsockopt() call.  Here is the 
code fragment I am using.

if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 
     (char *)&mreq, sizeof(mreq)) < 0)   
  {
  perror("IP_ADD_MEMBERSHIP");
  exit(1);
  }

The problem is that this code compiles fine but produces a run-time 
error of "This option is unsupported".  Not being familiar with the 
GNU compile tools, and the Win32 environment in general, I don't know 
where this message is coming from.  Is this a limitation of the 
GNU-Win32 libraries?  Is there something I can do to get multicast 
support in my GNU-Win32 programs?

Thanks


---
Andrew Patrick <Andrew.Patrick@crc.doc.ca>
Communications Research Centre   http://debra.dgbt.doc.ca/~andrew/
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