--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/share/classes/sun/nio/ch/NativeDispatcher.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2000, 2013, 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 sun.nio.ch;
+
+import java.io.*;
+
+/**
+ * Allows different platforms to call different native methods
+ * for read and write operations.
+ */
+
+abstract class NativeDispatcher
+{
+
+    abstract int read(FileDescriptor fd, long address, int len)
+        throws IOException;
+
+    /**
+     * Returns {@code true} if pread/pwrite needs to be synchronized with
+     * position sensitive methods.
+     */
+    boolean needsPositionLock() {
+        return false;
+    }
+
+    int pread(FileDescriptor fd, long address, int len, long position)
+        throws IOException
+    {
+        throw new IOException("Operation Unsupported");
+    }
+
+    abstract long readv(FileDescriptor fd, long address, int len)
+        throws IOException;
+
+    abstract int write(FileDescriptor fd, long address, int len)
+        throws IOException;
+
+    int pwrite(FileDescriptor fd, long address, int len, long position)
+        throws IOException
+    {
+        throw new IOException("Operation Unsupported");
+    }
+
+    abstract long writev(FileDescriptor fd, long address, int len)
+        throws IOException;
+
+    abstract void close(FileDescriptor fd) throws IOException;
+
+    // Prepare the given fd for closing by duping it to a known internal fd
+    // that's already closed.  This is necessary on some operating systems
+    // (Solaris and Linux) to prevent fd recycling.
+    //
+    void preClose(FileDescriptor fd) throws IOException {
+        // Do nothing by default; this is only needed on Unix
+    }
+
+}