--- /dev/null	2018-06-30 13:49:24.634979840 -0700
+++ new/src/jdk.net/linux/classes/rdma/ch/RdmaSocketDispatcher.java	2018-06-30 14:07:19.112167061 -0700
@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2000, 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.
+ */
+
+package rdma.ch;
+
+import sun.nio.ch.SocketDispatcher;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.io.*;
+
+/**
+ * Allows different platforms to call different native methods
+ * for read and write operations.
+ */
+
+public class RdmaSocketDispatcher extends SocketDispatcher
+{
+    private static PlatformRdmaSocketDispatcher platformRdmaSocketDispatcher =
+            PlatformRdmaSocketDispatcher.get();
+
+    protected int read(FileDescriptor fd, long address, int len) throws IOException {
+        return platformRdmaSocketDispatcher.read(fd, address, len);
+    }
+
+    protected long readv(FileDescriptor fd, long address, int len) throws IOException {
+        return platformRdmaSocketDispatcher.readv(fd, address, len);
+    }
+
+    protected int write(FileDescriptor fd, long address, int len) throws IOException {
+        return platformRdmaSocketDispatcher.write(fd, address, len);
+    }
+
+    protected long writev(FileDescriptor fd, long address, int len) throws IOException {
+        return platformRdmaSocketDispatcher.writev(fd, address, len);
+    }
+
+    protected void close(FileDescriptor fd) throws IOException {
+        platformRdmaSocketDispatcher.close(fd);
+    }
+
+    public void preClose(FileDescriptor fd) throws IOException {
+        platformRdmaSocketDispatcher.preClose(fd);
+    }
+
+    static class PlatformRdmaSocketDispatcher {
+        @SuppressWarnings("unchecked")
+        private static PlatformRdmaSocketDispatcher newInstance(String cn) {
+            Class<PlatformRdmaSocketDispatcher> c;
+            try {
+                c = (Class<PlatformRdmaSocketDispatcher>)Class.forName(cn);
+                return c.getConstructor(new Class<?>[] {}).newInstance();
+            } catch (ReflectiveOperationException x) {
+                throw new AssertionError(x);
+            }
+        }
+
+        private static PlatformRdmaSocketDispatcher create() {
+            String osname = AccessController.doPrivileged(
+                    new PrivilegedAction<String>() {
+                        public String run() {
+                            return System.getProperty("os.name");
+                        }
+                    });
+            if ("Linux".equals(osname))
+                return newInstance("rdma.ch.LinuxRdmaSocketDispatcher");
+            return new PlatformRdmaSocketDispatcher();
+        }
+
+        private static final PlatformRdmaSocketDispatcher instance = create();
+
+        static PlatformRdmaSocketDispatcher get() {
+            return instance;
+        }
+
+        protected int read(FileDescriptor fd, long address, int len) throws IOException {
+            throw new UnsupportedOperationException("unsupported socket operation");
+        }
+
+        protected long readv(FileDescriptor fd, long address, int len) throws IOException {
+            throw new UnsupportedOperationException("unsupported socket operation");
+        }
+
+        protected int write(FileDescriptor fd, long address, int len) throws IOException {
+            throw new UnsupportedOperationException("unsupported socket operation");
+        }
+
+        protected long writev(FileDescriptor fd, long address, int len) throws IOException {
+            throw new UnsupportedOperationException("unsupported socket operation");
+        }
+
+        protected void close(FileDescriptor fd) throws IOException {
+            throw new UnsupportedOperationException("unsupported socket operation");
+        }
+
+        public void preClose(FileDescriptor fd) throws IOException {
+            throw new UnsupportedOperationException("unsupported socket operation");
+        }
+    }
+}