diff -r 4ebc2e2fb97c -r 71c04702a3d5 src/java.base/unix/native/libnio/ch/DatagramChannelImpl.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/unix/native/libnio/ch/DatagramChannelImpl.c	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,233 @@
+/*
+ * Copyright (c) 2001, 2017, 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 "jni.h"
+#include "jni_util.h"
+#include "jvm.h"
+#include "jlong.h"
+
+#include <netdb.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#if defined(__linux__) || defined(_ALLBSD_SOURCE)
+#include <netinet/in.h>
+#endif
+
+#include "net_util.h"
+#include "net_util_md.h"
+#include "nio.h"
+#include "nio_util.h"
+
+#include "sun_nio_ch_DatagramChannelImpl.h"
+
+static jfieldID dci_senderID;   /* sender in sun.nio.ch.DatagramChannelImpl */
+static jfieldID dci_senderAddrID; /* sender InetAddress in sun.nio.ch.DatagramChannelImpl */
+static jfieldID dci_senderPortID; /* sender port in sun.nio.ch.DatagramChannelImpl */
+static jclass isa_class;        /* java.net.InetSocketAddress */
+static jmethodID isa_ctorID;    /*   .InetSocketAddress(InetAddress, int) */
+
+JNIEXPORT void JNICALL
+Java_sun_nio_ch_DatagramChannelImpl_initIDs(JNIEnv *env, jclass clazz)
+{
+    clazz = (*env)->FindClass(env, "java/net/InetSocketAddress");
+    CHECK_NULL(clazz);
+    isa_class = (*env)->NewGlobalRef(env, clazz);
+    if (isa_class == NULL) {
+        JNU_ThrowOutOfMemoryError(env, NULL);
+        return;
+    }
+    isa_ctorID = (*env)->GetMethodID(env, clazz, "<init>",
+                                     "(Ljava/net/InetAddress;I)V");
+    CHECK_NULL(isa_ctorID);
+
+    clazz = (*env)->FindClass(env, "sun/nio/ch/DatagramChannelImpl");
+    CHECK_NULL(clazz);
+    dci_senderID = (*env)->GetFieldID(env, clazz, "sender",
+                                      "Ljava/net/SocketAddress;");
+    CHECK_NULL(dci_senderID);
+    dci_senderAddrID = (*env)->GetFieldID(env, clazz,
+                                          "cachedSenderInetAddress",
+                                          "Ljava/net/InetAddress;");
+    CHECK_NULL(dci_senderAddrID);
+    dci_senderPortID = (*env)->GetFieldID(env, clazz,
+                                          "cachedSenderPort", "I");
+    CHECK_NULL(dci_senderPortID);
+}
+
+JNIEXPORT void JNICALL
+Java_sun_nio_ch_DatagramChannelImpl_disconnect0(JNIEnv *env, jobject this,
+                                                jobject fdo, jboolean isIPv6)
+{
+    jint fd = fdval(env, fdo);
+    int rv;
+
+#if defined(__solaris__)
+    rv = connect(fd, 0, 0);
+#else
+    SOCKETADDRESS sa;
+    socklen_t len = isIPv6 ? sizeof(struct sockaddr_in6) :
+                             sizeof(struct sockaddr_in);
+
+    memset(&sa, 0, sizeof(sa));
+#if defined(_ALLBSD_SOURCE)
+    sa.sa.sa_family = isIPv6 ? AF_INET6 : AF_INET;
+#else
+    sa.sa.sa_family = AF_UNSPEC;
+#endif
+
+    rv = connect(fd, &sa.sa, len);
+
+#if defined(_ALLBSD_SOURCE)
+    if (rv < 0 && errno == EADDRNOTAVAIL)
+        rv = errno = 0;
+#elif defined(_AIX)
+    /* See W. Richard Stevens, "UNIX Network Programming, Volume 1", p. 254:
+     * 'Setting the address family to AF_UNSPEC might return EAFNOSUPPORT
+     * but that is acceptable.
+     */
+    if (rv < 0 && errno == EAFNOSUPPORT)
+        rv = errno = 0;
+#endif // defined(_ALLBSD_SOURCE) || defined(_AIX)
+
+#endif // defined(__solaris__)
+
+    if (rv < 0)
+        handleSocketError(env, errno);
+}
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_ch_DatagramChannelImpl_receive0(JNIEnv *env, jobject this,
+                                             jobject fdo, jlong address,
+                                             jint len, jboolean connected)
+{
+    jint fd = fdval(env, fdo);
+    void *buf = (void *)jlong_to_ptr(address);
+    SOCKETADDRESS sa;
+    socklen_t sa_len = sizeof(SOCKETADDRESS);
+    jboolean retry = JNI_FALSE;
+    jint n = 0;
+    jobject senderAddr;
+
+    if (len > MAX_PACKET_LEN) {
+        len = MAX_PACKET_LEN;
+    }
+
+    do {
+        retry = JNI_FALSE;
+        n = recvfrom(fd, buf, len, 0, &sa.sa, &sa_len);
+        if (n < 0) {
+            if (errno == EWOULDBLOCK) {
+                return IOS_UNAVAILABLE;
+            }
+            if (errno == EINTR) {
+                return IOS_INTERRUPTED;
+            }
+            if (errno == ECONNREFUSED) {
+                if (connected == JNI_FALSE) {
+                    retry = JNI_TRUE;
+                } else {
+                    JNU_ThrowByName(env, JNU_JAVANETPKG
+                                    "PortUnreachableException", 0);
+                    return IOS_THROWN;
+                }
+            } else {
+                return handleSocketError(env, errno);
+            }
+        }
+    } while (retry == JNI_TRUE);
+
+    /*
+     * If the source address and port match the cached address
+     * and port in DatagramChannelImpl then we don't need to
+     * create InetAddress and InetSocketAddress objects.
+     */
+    senderAddr = (*env)->GetObjectField(env, this, dci_senderAddrID);
+    if (senderAddr != NULL) {
+        if (!NET_SockaddrEqualsInetAddress(env, &sa, senderAddr)) {
+            senderAddr = NULL;
+        } else {
+            jint port = (*env)->GetIntField(env, this, dci_senderPortID);
+            if (port != NET_GetPortFromSockaddr(&sa)) {
+                senderAddr = NULL;
+            }
+        }
+    }
+    if (senderAddr == NULL) {
+        jobject isa = NULL;
+        int port = 0;
+        jobject ia = NET_SockaddrToInetAddress(env, &sa, &port);
+        if (ia != NULL) {
+            isa = (*env)->NewObject(env, isa_class, isa_ctorID, ia, port);
+        }
+        CHECK_NULL_RETURN(isa, IOS_THROWN);
+
+        (*env)->SetObjectField(env, this, dci_senderAddrID, ia);
+        (*env)->SetIntField(env, this, dci_senderPortID,
+                            NET_GetPortFromSockaddr(&sa));
+        (*env)->SetObjectField(env, this, dci_senderID, isa);
+    }
+    return n;
+}
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_ch_DatagramChannelImpl_send0(JNIEnv *env, jobject this,
+                                          jboolean preferIPv6, jobject fdo, jlong address,
+                                          jint len, jobject destAddress, jint destPort)
+{
+    jint fd = fdval(env, fdo);
+    void *buf = (void *)jlong_to_ptr(address);
+    SOCKETADDRESS sa;
+    int sa_len = 0;
+    jint n = 0;
+
+    if (len > MAX_PACKET_LEN) {
+        len = MAX_PACKET_LEN;
+    }
+
+    if (NET_InetAddressToSockaddr(env, destAddress, destPort, &sa,
+                                  &sa_len, preferIPv6) != 0) {
+      return IOS_THROWN;
+    }
+
+    n = sendto(fd, buf, len, 0, &sa.sa, sa_len);
+    if (n < 0) {
+        if (errno == EAGAIN) {
+            return IOS_UNAVAILABLE;
+        }
+        if (errno == EINTR) {
+            return IOS_INTERRUPTED;
+        }
+        if (errno == ECONNREFUSED) {
+            JNU_ThrowByName(env, JNU_JAVANETPKG "PortUnreachableException", 0);
+            return IOS_THROWN;
+        }
+        return handleSocketError(env, errno);
+    }
+    return n;
+}