--- /dev/null	2018-06-20 11:01:03.657616567 -0700
+++ new/src/jdk.net/linux/native/libextnet/RdmaSocketChannelImpl.c	2018-06-22 12:23:51.138672083 -0700
@@ -0,0 +1,107 @@
+/*
+ * 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.
+ */
+
+#include <netdb.h>
+#include <sys/types.h>
+#include <rdma/rsocket.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <poll.h>
+
+#include <netinet/in.h>
+
+#include "jni.h"
+#include "jni_util.h"
+#include "net_util.h"
+#include "jvm.h"
+#include "jlong.h"
+#include "rdma_ch_RdmaSocketChannelImpl.h"
+#include "nio_util.h"
+#include "nio.h"
+
+static jfieldID fd_fdID;
+
+JNIEXPORT void JNICALL
+Java_rdma_ch_RdmaSocketChannelImpl_initIDs(JNIEnv *env, jclass clazz)
+{
+    CHECK_NULL(clazz = (*env)->FindClass(env, "java/io/FileDescriptor"));
+    CHECK_NULL(fd_fdID = (*env)->GetFieldID(env, clazz, "fd", "I"));
+}
+
+jint fdVal(JNIEnv *env, jobject fdo)
+{
+    return (*env)->GetIntField(env, fdo, fd_fdID);
+}
+
+JNIEXPORT jint JNICALL
+Java_rdma_ch_RdmaSocketChannelImpl_checkConnect(JNIEnv *env, jobject this,
+                                               jobject fdo, jboolean block)
+{
+    int error = 0;
+    socklen_t n = sizeof(int);
+    jint fd = fdVal(env, fdo);
+    int result = 0;
+    struct pollfd poller;
+
+    poller.fd = fd;
+    poller.events = POLLOUT;
+    poller.revents = 0;
+    result = rpoll(&poller, 1, block ? -1 : 0);
+
+    if (result < 0) {
+        if (errno == EINTR) {
+            return IOS_INTERRUPTED;
+        } else {
+            JNU_ThrowIOExceptionWithLastError(env, "poll failed");
+            return IOS_THROWN;
+        }
+    }
+    if (!block && (result == 0))
+        return IOS_UNAVAILABLE;
+
+    if (result > 0) {
+        errno = 0;
+        result = rgetsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &n);
+        if (result < 0) {
+            return handleSocketError(env, errno);
+        } else if (error) {
+            return handleSocketError(env, error);
+        } else if ((poller.revents & POLLHUP) != 0) {
+            return handleSocketError(env, ENOTCONN);
+        }
+        // connected
+        return 1;
+    }
+    return 0;
+}
+
+JNIEXPORT jint JNICALL
+Java_rdma_ch_RdmaSocketChannelImpl_sendOutOfBandData(JNIEnv* env, jclass this,
+                                                    jobject fdo, jbyte b)
+{
+    int n = rsend(fdVal(env, fdo), (const void*)&b, 1, MSG_OOB);
+    return convertReturnVal(env, n, JNI_FALSE);
+}