diff -r c943ca4a3380 -r 39275d6a8cac jdk/src/java.base/unix/native/libnet/AbstractPlainDatagramSocketImpl.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.base/unix/native/libnet/AbstractPlainDatagramSocketImpl.c	Wed May 28 14:51:24 2014 +0100
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2014, 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 <sys/types.h>
+#include <sys/socket.h>
+
+#ifdef __solaris__
+#include <unistd.h>
+#include <stropts.h>
+
+#ifndef BSD_COMP
+#define BSD_COMP
+#endif
+
+#endif
+
+#include <sys/ioctl.h>
+
+#include "jvm.h"
+#include "jni_util.h"
+#include "net_util.h"
+
+#include "java_net_AbstractPlainDatagramSocketImpl.h"
+
+static jfieldID IO_fd_fdID;
+
+static jfieldID apdsi_fdID;
+
+
+/*
+ * Class:     java_net_AbstractPlainDatagramSocketImpl
+ * Method:    init
+ * Signature: ()V
+ */
+JNIEXPORT void JNICALL
+Java_java_net_AbstractPlainDatagramSocketImpl_init(JNIEnv *env, jclass cls) {
+
+    apdsi_fdID = (*env)->GetFieldID(env, cls, "fd",
+                                   "Ljava/io/FileDescriptor;");
+    CHECK_NULL(apdsi_fdID);
+
+    IO_fd_fdID = NET_GetFileDescriptorID(env);
+}
+
+/*
+ * Class:     java_net_AbstractPlainDatagramSocketImpl
+ * Method:    dataAvailable
+ * Signature: ()I
+ */
+JNIEXPORT jint JNICALL Java_java_net_AbstractPlainDatagramSocketImpl_dataAvailable
+(JNIEnv *env, jobject this) {
+    int fd, retval;
+
+    jobject fdObj = (*env)->GetObjectField(env, this, apdsi_fdID);
+
+    if (IS_NULL(fdObj)) {
+        JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",
+                        "Socket closed");
+        return -1;
+    }
+    fd = (*env)->GetIntField(env, fdObj, IO_fd_fdID);
+
+    if (ioctl(fd, FIONREAD, &retval) < 0) {
+        return -1;
+    }
+    return retval;
+}