Hey,
The setsockopt() for SO_REUSEADDR is at the wrong level.
Try the SOL_SOCKET instead of IPPROTO_IP.
Tuan
On 28 Sep 1999 [EMAIL PROTECTED] wrote:
> 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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