--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/net/Inet4AddressImpl.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2002-2005 Sun Microsystems, Inc.  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.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+package java.net;
+import java.io.IOException;
+
+/*
+ * Package private implementation of InetAddressImpl for IPv4.
+ *
+ * @since 1.4
+ */
+class Inet4AddressImpl implements InetAddressImpl {
+    public native String getLocalHostName() throws UnknownHostException;
+    public native InetAddress[]
+        lookupAllHostAddr(String hostname) throws UnknownHostException;
+    public native String getHostByAddr(byte[] addr) throws UnknownHostException;
+    private native boolean isReachable0(byte[] addr, int timeout, byte[] ifaddr, int ttl) throws IOException;
+
+    public synchronized InetAddress anyLocalAddress() {
+        if (anyLocalAddress == null) {
+            anyLocalAddress = new Inet4Address(); // {0x00,0x00,0x00,0x00}
+            anyLocalAddress.hostName = "0.0.0.0";
+        }
+        return anyLocalAddress;
+    }
+
+    public synchronized InetAddress loopbackAddress() {
+        if (loopbackAddress == null) {
+            byte[] loopback = {0x7f,0x00,0x00,0x01};
+            loopbackAddress = new Inet4Address("localhost", loopback);
+        }
+        return loopbackAddress;
+    }
+
+  public boolean isReachable(InetAddress addr, int timeout, NetworkInterface netif, int ttl) throws IOException {
+      byte[] ifaddr = null;
+      if (netif != null) {
+          /*
+           * Let's make sure we use an address of the proper family
+           */
+          java.util.Enumeration it = netif.getInetAddresses();
+          InetAddress inetaddr = null;
+          while (!(inetaddr instanceof Inet4Address) &&
+                 it.hasMoreElements())
+              inetaddr = (InetAddress) it.nextElement();
+          if (inetaddr instanceof Inet4Address)
+              ifaddr = inetaddr.getAddress();
+      }
+      return isReachable0(addr.getAddress(), timeout, ifaddr, ttl);
+  }
+    private InetAddress      anyLocalAddress;
+    private InetAddress      loopbackAddress;
+}