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Alessandro Saffiotti wrote: > Hi there, > > I ran into the following problem when using setsockopt to create a > multicast receiver in my own application. Here is the relevant part > of the code: > > ---------------------------------------------------------------------- > . > . > . > tcp_broadcast_receiver = socket(PF_INET,SOCK_DGRAM,IPPROTO_IP); > > memset(&imreq, 0, sizeof(struct ip_mreq)); > imreq.imr_multiaddr.s_addr = inet_addr("227.1.3.5"); > imreq.imr_interface.s_addr = INADDR_ANY; > > if(setsockopt(tcp_broadcast_receiver, IPPROTO_IP, IP_ADD_MEMBERSHIP, > (const void *)&imreq, sizeof(struct ip_mreq)) != 0) > perror("Error joining multicast group"); > . > . > . > ---------------------------------------------------------------------- > > It compiles ok, but when I run it setsockopt fails producing the > following report: > > Error joining multicast group: Invalid argument > > I have noted that a similar problem was reported long time ago, when > support for multicast was not implemented, but I understand that this > support is not available. > > I have also read the discussion about the conflicting values for > constants between winsock1 and winsock2. I have tried to replace > IP_ADD_MEMBERSHIP by hardcoding either 5 (winsock1) or 12 (winsok2), > but I get the same behavior. > > I run Cygwin 1.5.18 on Windows XP pro SP2. > > Any hints? > Thanks! > > Alessandro Saffiotti > I do not know whether it works with 1.5.21 but you should always test with the latest version before you create a problem report. -- Vaclav Haisman
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