try using reversed IP_MULTICAST_LOOP semantics for windows

diff --git a/libs/midi++2/ipmidi_port.cc b/libs/midi++2/ipmidi_port.cc
index 139c799c0ae4484cd4b08dfcf9d50fdf7137f03b..a8b11b1ae5f396fa708176cb6947eb805cab7b1e 100644 (file)
--- a/libs/midi++2/ipmidi_port.cc
+++ b/libs/midi++2/ipmidi_port.cc
@@ -231,48 +231,21 @@ IPMIDIPort::open_sockets (int base_port, const string& ifname)
        addrout.sin_addr.s_addr = ::inet_addr("225.0.0.37");
        addrout.sin_port = htons (base_port);
 
-       struct sockaddr_in any;
-       ::memset(&any, 0, sizeof(struct sockaddr_in));
-       addrout.sin_family = AF_INET;
-       addrout.sin_addr.s_addr = INADDR_ANY;
-       addrout.sin_port = htons (base_port);
-
-       if (::bind(sockout, (struct sockaddr *) (&any), sizeof(any)) < 0) {
-               ::perror("bind");
-               cout << "ipmidi bind error\n";
-               return false;
-       }
+       // Turn off loopback...
+       int loop = 0;
 
-#ifndef PLATFORM_WINDOWS
-       int loop;
-       socklen_t size;
+#ifdef PLATFORM_WINDOWS
+       const int target_sock = sockin;
 #else
-       u_char loop;
-       int size;
+       const int target_sock = sockout;
 #endif
 
-       if (::getsockopt (sockout, IPPROTO_IP, IP_MULTICAST_LOOP, (char *) &loop, &size)) {
-               // ::perror ("getsockopt(IP_MULTICAST_LOOP)");
-               cout << "Cannot get loopback status\n";
-       } else {
-               cout << "********* 1. multicast loopback: " << loop << " size was " << size << endl;
-       }
-
-       // Turn off loopback...
-       loop = 0;
-       if (::setsockopt(sockout, IPPROTO_IP, IP_MULTICAST_LOOP, (char *) &loop, sizeof (loop)) < 0) {
+       if (::setsockopt (target_sock, IPPROTO_IP, IP_MULTICAST_LOOP, (char *) &loop, sizeof (loop)) < 0) {
                //::perror("setsockopt(IP_MULTICAST_LOOP)");
                cout << "Cannot set loopback status\n";
                return false;
        }
 
-       if (::getsockopt (sockout, IPPROTO_IP, IP_MULTICAST_LOOP, (char *) &loop, &size)) {
-               // ::perror ("getsockopt(IP_MULTICAST_LOOP)");
-               cout << "Cannot Get loopback status 2\n";
-       } else {
-               cout << "********* 2. multicast loopback: " << loop << " size was " << size << endl;
-       }
-
 #ifndef PLATFORM_WINDOWS
 
        if (fcntl (sockin, F_SETFL, O_NONBLOCK)) {