--- /dev/null	2018-11-27 03:18:47.532777276 -0500
+++ new/src/jdk.net/linux/native/libextnet/LinuxRdmaSocketDispatcherImpl.c	2018-11-30 08:33:07.054539507 -0500
@@ -0,0 +1,140 @@
+/*
+ * 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.
+ */
+
+#include "jdk_internal_net_rdma_LinuxRdmaSocketDispatcherImpl.h"
+#include "nio.h"
+#include "nio_util.h"
+#include <Rsocket.h>
+
+static int preCloseFD = -1;     /* File descriptor to which we dup other fd's
+                                   before closing them for real */
+static jfieldID fd_fdID;
+
+jint
+convertReturnVal(JNIEnv *env, jint n, jboolean reading) {
+    if (n > 0)
+        return n;
+    else if (n == 0) {
+        if (reading) {
+            return IOS_EOF;
+        } else {
+            return 0;
+        }
+    }
+    else if (errno == EAGAIN)
+        return IOS_UNAVAILABLE;
+    else if (errno == EINTR)
+        return IOS_INTERRUPTED;
+    else {
+        const char *msg = reading ? "Read failed" : "Write failed";
+        JNU_ThrowIOExceptionWithLastError(env, msg);
+        return IOS_THROWN;
+    }
+}
+
+jlong
+convertLongReturnVal(JNIEnv *env, jlong n, jboolean reading) {
+    if (n > 0)
+        return n;
+    else if (n == 0) {
+        if (reading) {
+            return IOS_EOF;
+        } else {
+            return 0;
+        }
+    }
+    else if (errno == EAGAIN)
+        return IOS_UNAVAILABLE;
+    else if (errno == EINTR)
+        return IOS_INTERRUPTED;
+    else {
+        const char *msg = reading ? "Read failed" : "Write failed";
+        JNU_ThrowIOExceptionWithLastError(env, msg);
+        return IOS_THROWN;
+    }
+}
+
+JNIEXPORT void JNICALL
+Java_jdk_internal_net_rdma_LinuxRdmaSocketDispatcherImpl_init(JNIEnv *env,
+        jclass cl) {
+    loadRdmaFuncs(env);
+    CHECK_NULL(cl = (*env)->FindClass(env, "java/io/FileDescriptor"));
+    CHECK_NULL(fd_fdID = (*env)->GetFieldID(env, cl, "fd", "I"));
+
+    int sp[2];
+    if (socketpair(PF_UNIX, SOCK_STREAM, 0, sp) < 0) {
+        JNU_ThrowIOExceptionWithLastError(env, "socketpair failed");
+        return;
+    }
+    preCloseFD = sp[0];
+    rs_close(sp[1]);
+}
+
+JNIEXPORT jint JNICALL
+Java_jdk_internal_net_rdma_LinuxRdmaSocketDispatcherImpl_read0(JNIEnv *env,
+        jclass clazz, jobject fdo, jlong address, jint len) {
+    jint fd = (*env)->GetIntField(env, fdo, fd_fdID);
+    void *buf = (void *)jlong_to_ptr(address);
+    return convertReturnVal(env, rs_read(fd, buf, len), JNI_TRUE);
+}
+
+JNIEXPORT jlong JNICALL
+Java_jdk_internal_net_rdma_LinuxRdmaSocketDispatcherImpl_readv0(JNIEnv *env,
+        jclass clazz, jobject fdo, jlong address, jint len) {
+    jint fd = (*env)->GetIntField(env, fdo, fd_fdID);
+    struct iovec *iov = (struct iovec *)jlong_to_ptr(address);
+    return convertLongReturnVal(env, rs_readv(fd, iov, len), JNI_TRUE);
+}
+
+JNIEXPORT jint JNICALL
+Java_jdk_internal_net_rdma_LinuxRdmaSocketDispatcherImpl_write0(JNIEnv *env,
+        jclass clazz, jobject fdo, jlong address, jint len) {
+    jint fd = (*env)->GetIntField(env, fdo, fd_fdID);
+    void *buf = (void *)jlong_to_ptr(address);
+    return convertReturnVal(env, rs_write(fd, buf, len), JNI_FALSE);
+}
+
+JNIEXPORT jlong JNICALL
+Java_jdk_internal_net_rdma_LinuxRdmaSocketDispatcherImpl_writev0(JNIEnv *env,
+        jclass clazz, jobject fdo, jlong address, jint len) {
+    jint fd = (*env)->GetIntField(env, fdo, fd_fdID);
+    struct iovec *iov = (struct iovec *)jlong_to_ptr(address);
+    return convertLongReturnVal(env, rs_writev(fd, iov, len), JNI_FALSE);
+}
+
+static void closeFileDescriptor(JNIEnv *env, int fd) {
+    if (fd != -1) {
+        int result = rs_close(fd);
+        if (result < 0)
+            JNU_ThrowIOExceptionWithLastError(env, "Close failed");
+    }
+}
+
+JNIEXPORT void JNICALL
+Java_jdk_internal_net_rdma_LinuxRdmaSocketDispatcherImpl_close0(JNIEnv *env,
+        jclass clazz, jobject fdo) {
+    jint fd = (*env)->GetIntField(env, fdo, fd_fdID);
+    closeFileDescriptor(env, fd);
+}