libca: enable mcast loopback

2016-01-11 20:59:08 -05:00
parent 568ece9c27
commit 98504d1cdc
1 changed files with 13 additions and 0 deletions
@@ -163,6 +163,19 @@ udpiiu::udpiiu (
        throwWithLocation ( noSocket () );
    }

+#ifdef IP_ADD_MEMBERSHIP
+    {
+        int flag = 1;
+        if(setsockopt(this->sock, IPPROTO_IP, IP_MULTICAST_LOOP, &flag, sizeof(flag))==-1)
+        {
+            char sockErrBuf[64];
+            epicsSocketConvertErrnoToString (
+                sockErrBuf, sizeof ( sockErrBuf ) );
+            errlogPrintf("CAC: failed to set mcast loopback\n");
+        }
+    }
+#endif
+
    int boolValue = true;
    int status = setsockopt ( this->sock, SOL_SOCKET, SO_BROADCAST, 
                (char *) &boolValue, sizeof ( boolValue ) );