--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/linux/classes/sun/nio/ch/EPoll.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 2008, 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.IOException;
+import jdk.internal.misc.Unsafe;
+
+/**
+ * Provides access to the Linux epoll facility.
+ */
+
+class EPoll {
+    private EPoll() { }
+
+    private static final Unsafe unsafe = Unsafe.getUnsafe();
+
+    /**
+     * typedef union epoll_data {
+     *     void *ptr;
+     *     int fd;
+     *     __uint32_t u32;
+     *     __uint64_t u64;
+     *  } epoll_data_t;
+     *
+     * struct epoll_event {
+     *     __uint32_t events;
+     *     epoll_data_t data;
+     * }
+     */
+    private static final int SIZEOF_EPOLLEVENT   = eventSize();
+    private static final int OFFSETOF_EVENTS     = eventsOffset();
+    private static final int OFFSETOF_FD         = dataOffset();
+
+    // opcodes
+    static final int EPOLL_CTL_ADD  = 1;
+    static final int EPOLL_CTL_DEL  = 2;
+    static final int EPOLL_CTL_MOD  = 3;
+
+    // flags
+    static final int EPOLLONESHOT   = (1 << 30);
+
+    /**
+     * Allocates a poll array to handle up to {@code count} events.
+     */
+    static long allocatePollArray(int count) {
+        return unsafe.allocateMemory(count * SIZEOF_EPOLLEVENT);
+    }
+
+    /**
+     * Free a poll array
+     */
+    static void freePollArray(long address) {
+        unsafe.freeMemory(address);
+    }
+
+    /**
+     * Returns event[i];
+     */
+    static long getEvent(long address, int i) {
+        return address + (SIZEOF_EPOLLEVENT*i);
+    }
+
+    /**
+     * Returns event->data.fd
+     */
+    static int getDescriptor(long eventAddress) {
+        return unsafe.getInt(eventAddress + OFFSETOF_FD);
+    }
+
+    /**
+     * Returns event->events
+     */
+    static int getEvents(long eventAddress) {
+        return unsafe.getInt(eventAddress + OFFSETOF_EVENTS);
+    }
+
+    // -- Native methods --
+
+    private static native int eventSize();
+
+    private static native int eventsOffset();
+
+    private static native int dataOffset();
+
+    static native int epollCreate() throws IOException;
+
+    static native int epollCtl(int epfd, int opcode, int fd, int events);
+
+    static native int epollWait(int epfd, long pollAddress, int numfds)
+        throws IOException;
+
+    static {
+        IOUtil.load();
+    }
+}