172         CHECK_NULL(socketExceptionCls);
 173     }
 174     fdObj = (*env)->GetObjectField(env, this, psi_fdID);
 175 
 176     if (fdObj == NULL) {
 177         (*env)->ThrowNew(env, socketExceptionCls, "null fd object");
 178         return;
 179     }
 180 
 181     if ((fd = socket(domain, type, 0)) == -1) {
 182         /* note: if you run out of fds, you may not be able to load
 183          * the exception class, and get a NoClassDefFoundError
 184          * instead.
 185          */
 186         NET_ThrowNew(env, errno, "can't create socket");
 187         return;
 188     }
 189 
 190     /* Disable IPV6_V6ONLY to ensure dual-socket support */
 191     if (domain == AF_INET6) {
 192         int arg = 0;
 193         if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&arg,
 194                        sizeof(int)) < 0) {
 195             NET_ThrowNew(env, errno, "cannot set IPPROTO_IPV6");
 196             close(fd);
 197             return;
 198         }
 199     }
 200 
 201     /*
 202      * If this is a server socket then enable SO_REUSEADDR
 203      * automatically and set to non blocking.
 204      */
 205     ssObj = (*env)->GetObjectField(env, this, psi_serverSocketID);
 206     if (ssObj != NULL) {
 207         int arg = 1;
 208         SET_NONBLOCKING(fd);
 209         if (NET_SetSockOpt(fd, SOL_SOCKET, SO_REUSEADDR, (char*)&arg,
 210                        sizeof(arg)) < 0) {
 211             NET_ThrowNew(env, errno, "cannot set SO_REUSEADDR");
 212             close(fd);

 172         CHECK_NULL(socketExceptionCls);
 173     }
 174     fdObj = (*env)->GetObjectField(env, this, psi_fdID);
 175 
 176     if (fdObj == NULL) {
 177         (*env)->ThrowNew(env, socketExceptionCls, "null fd object");
 178         return;
 179     }
 180 
 181     if ((fd = socket(domain, type, 0)) == -1) {
 182         /* note: if you run out of fds, you may not be able to load
 183          * the exception class, and get a NoClassDefFoundError
 184          * instead.
 185          */
 186         NET_ThrowNew(env, errno, "can't create socket");
 187         return;
 188     }
 189 
 190     /* Disable IPV6_V6ONLY to ensure dual-socket support */
 191     if (domain == AF_INET6) {
 192         int arg = 1;    // ENABLE
 193         if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&arg,
 194                        sizeof(int)) < 0) {
 195             NET_ThrowNew(env, errno, "cannot set IPPROTO_IPV6");
 196             close(fd);
 197             return;
 198         }
 199     }
 200 
 201     /*
 202      * If this is a server socket then enable SO_REUSEADDR
 203      * automatically and set to non blocking.
 204      */
 205     ssObj = (*env)->GetObjectField(env, this, psi_serverSocketID);
 206     if (ssObj != NULL) {
 207         int arg = 1;
 208         SET_NONBLOCKING(fd);
 209         if (NET_SetSockOpt(fd, SOL_SOCKET, SO_REUSEADDR, (char*)&arg,
 210                        sizeof(arg)) < 0) {
 211             NET_ThrowNew(env, errno, "cannot set SO_REUSEADDR");
 212             close(fd);