--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.net/linux/classes/jdk/internal/net/rdma/RdmaSocketOptionRegistry.java.template	Sat Jan 26 14:02:35 2019 +0000
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+@@END_COPYRIGHT@@
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+
+/* To be able to name the Java constants the same as the C constants without
+   having the preprocessor rewrite those identifiers, add PREFIX_ to all
+   identifiers matching a C constant. The PREFIX_ is filtered out in the
+   makefile. */
+
+@@START_HERE@@
+
+package jdk.internal.net.rdma;
+import java.net.SocketOption;
+import java.net.StandardSocketOptions;
+import java.net.ProtocolFamily;
+import java.util.Map;
+import java.util.HashMap;
+
+class RdmaSocketOptionRegistry {
+
+    private RdmaSocketOptionRegistry() { }
+
+    private static class RegistryKey {
+        private final SocketOption<?> name;
+        private final ProtocolFamily family;
+        RegistryKey(SocketOption<?> name, ProtocolFamily family) {
+            this.name = name;
+            this.family = family;
+        }
+        public int hashCode() {
+            return name.hashCode() + family.hashCode();
+        }
+        public boolean equals(Object ob) {
+            if (ob == null) return false;
+            if (!(ob instanceof RegistryKey)) return false;
+            RegistryKey other = (RegistryKey)ob;
+            if (this.name != other.name) return false;
+            if (this.family != other.family) return false;
+            return true;
+        }
+    }
+
+    private static class LazyInitialization {
+
+        static final Map<RegistryKey,RdmaOptionKey> options = options();
+
+        private static Map<RegistryKey,RdmaOptionKey> options() {
+            Map<RegistryKey,RdmaOptionKey> map =
+                new HashMap<RegistryKey,RdmaOptionKey>();
+            map.put(new RegistryKey(StandardSocketOptions.PREFIX_SO_SNDBUF,
+                RdmaNet.UNSPEC), new RdmaOptionKey(SOL_SOCKET, SO_SNDBUF));
+            map.put(new RegistryKey(StandardSocketOptions.PREFIX_SO_RCVBUF,
+                RdmaNet.UNSPEC), new RdmaOptionKey(SOL_SOCKET, SO_RCVBUF));
+            map.put(new RegistryKey(StandardSocketOptions.PREFIX_SO_REUSEADDR,
+                RdmaNet.UNSPEC), new RdmaOptionKey(SOL_SOCKET, SO_REUSEADDR));
+            // IPPROTO_TCP is 6
+            map.put(new RegistryKey(StandardSocketOptions.PREFIX_TCP_NODELAY,
+                RdmaNet.UNSPEC), new RdmaOptionKey(6, TCP_NODELAY));
+            return map;
+        }
+    }
+
+    public static RdmaOptionKey findOption(SocketOption<?> name,
+                                           ProtocolFamily family) {
+        RegistryKey key = new RegistryKey(name, family);
+        return LazyInitialization.options.get(key);
+    }
+}