--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/unix/classes/java/net/PlainSocketImpl.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,152 @@
+/*
+ * Copyright (c) 2007, 2016, 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 java.net;
+
+import java.io.IOException;
+import java.io.FileDescriptor;
+import java.util.Set;
+import java.util.HashSet;
+import sun.net.ext.ExtendedSocketOptions;
+
+/*
+ * On Unix systems we simply delegate to native methods.
+ *
+ * @author Chris Hegarty
+ */
+
+class PlainSocketImpl extends AbstractPlainSocketImpl
+{
+    static {
+        initProto();
+    }
+
+    /**
+     * Constructs an empty instance.
+     */
+    PlainSocketImpl() { }
+
+    /**
+     * Constructs an instance with the given file descriptor.
+     */
+    PlainSocketImpl(FileDescriptor fd) {
+        this.fd = fd;
+    }
+
+    static final ExtendedSocketOptions extendedOptions =
+            ExtendedSocketOptions.getInstance();
+
+    protected <T> void setOption(SocketOption<T> name, T value) throws IOException {
+        if (!extendedOptions.isOptionSupported(name)) {
+            if (!name.equals(StandardSocketOptions.SO_REUSEPORT)) {
+                super.setOption(name, value);
+            } else {
+                if (supportedOptions().contains(name)) {
+                    super.setOption(name, value);
+                } else {
+                    throw new UnsupportedOperationException("unsupported option");
+                }
+            }
+        } else {
+            if (getSocket() == null) {
+                throw new UnsupportedOperationException("unsupported option");
+            }
+            if (isClosedOrPending()) {
+                throw new SocketException("Socket closed");
+            }
+            extendedOptions.setOption(fd, name, value);
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    protected <T> T getOption(SocketOption<T> name) throws IOException {
+        if (!extendedOptions.isOptionSupported(name)) {
+            if (!name.equals(StandardSocketOptions.SO_REUSEPORT)) {
+                return super.getOption(name);
+            } else {
+                if (supportedOptions().contains(name)) {
+                    return super.getOption(name);
+                } else {
+                    throw new UnsupportedOperationException("unsupported option");
+                }
+            }
+        } else {
+            if (getSocket() == null) {
+                throw new UnsupportedOperationException("unsupported option");
+            }
+            if (isClosedOrPending()) {
+                throw new SocketException("Socket closed");
+            }
+            return (T) extendedOptions.getOption(fd, name);
+        }
+    }
+
+    protected Set<SocketOption<?>> supportedOptions() {
+        HashSet<SocketOption<?>> options = new HashSet<>(super.supportedOptions());
+        if (getSocket() != null) {
+            options.addAll(extendedOptions.options());
+        }
+        return options;
+    }
+
+    protected void socketSetOption(int opt, boolean b, Object val) throws SocketException {
+        if (opt == SocketOptions.SO_REUSEPORT &&
+            !supportedOptions().contains(StandardSocketOptions.SO_REUSEPORT)) {
+            throw new UnsupportedOperationException("unsupported option");
+        }
+        try {
+            socketSetOption0(opt, b, val);
+        } catch (SocketException se) {
+            if (socket == null || !socket.isConnected())
+                throw se;
+        }
+    }
+
+    native void socketCreate(boolean isServer) throws IOException;
+
+    native void socketConnect(InetAddress address, int port, int timeout)
+        throws IOException;
+
+    native void socketBind(InetAddress address, int port)
+        throws IOException;
+
+    native void socketListen(int count) throws IOException;
+
+    native void socketAccept(SocketImpl s) throws IOException;
+
+    native int socketAvailable() throws IOException;
+
+    native void socketClose0(boolean useDeferredClose) throws IOException;
+
+    native void socketShutdown(int howto) throws IOException;
+
+    static native void initProto();
+
+    native void socketSetOption0(int cmd, boolean on, Object value)
+        throws SocketException;
+
+    native int socketGetOption(int opt, Object iaContainerObj) throws SocketException;
+
+    native void socketSendUrgentData(int data) throws IOException;
+}