How do you share a multicast address/port ?

[dave-mlist]

I want to have several incarnations of the same program listening to the same
multicast address/port.  But I'm currently getting a 

listener: can't bind local socket (errno 98)

error on the second incarnation.  Here is my code:

  sockfd = socket(AF_INET, SOCK_DGRAM, 0);

  bzero ((char *) &mreq, sizeof (mreq));
  mreq.imr_multiaddr.s_addr = inet_addr(udp_ip_addr);
  mreq.imr_interface.s_addr = inet_addr(if_for_mc);
  /*  mreq.imr_interface.s_addr = htonl(INADDR_ANY); */

  optval = 1;
  setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
  setsockopt(sockfd, IPPROTO_IP, SO_REUSEADDR, (char *)&optval, sizeof(optval));

  bzero((char *) &serv_addr, sizeof(serv_addr));
  serv_addr.sin_family      = AF_INET;
  serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
  serv_addr.sin_port        = htons(atoi(av[3]));

  bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr));

I thought that the SO_REUSEADDR sockopt would let me re-bind to the same
address?  What am I doing wrong?

Dave
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