Make LocalSocket Closeable.

Enables usage of IoUtils.closeQuietly().

Change-Id: I91126297c1f235ae9da09f82d8f4f22db46558eb

Author: jsharkey

api/current.txt

@@ -12443,7 +12443,7 @@ package android.net {
     method public android.net.LocalSocketAddress getLocalSocketAddress();
   }
 
-  public class LocalSocket {
+  public class LocalSocket implements java.io.Closeable {
     ctor public LocalSocket();
     method public void bind(android.net.LocalSocketAddress) throws java.io.IOException;
     method public void close() throws java.io.IOException;

core/java/android/net/LocalSocket.java

@@ -16,6 +16,7 @@
 
 package android.net;
 
+import java.io.Closeable;
 import java.io.FileDescriptor;
 import java.io.IOException;
 import java.io.InputStream;
@@ -26,7 +27,7 @@
  * Creates a (non-server) socket in the UNIX-domain namespace. The interface
  * here is not entirely unlike that of java.net.Socket
  */
-public class LocalSocket {
+public class LocalSocket implements Closeable {
 
     private LocalSocketImpl impl;
     private volatile boolean implCreated;
@@ -167,6 +168,7 @@ public OutputStream getOutputStream() throws IOException {
      *
      * @throws IOException
      */
+    @Override
     public void close() throws IOException {
         implCreateIfNeeded();
         impl.close();

services/java/com/android/server/connectivity/Vpn.java

@@ -53,6 +53,8 @@
 import java.nio.charset.Charsets;
 import java.util.Arrays;
 
+import libcore.io.IoUtils;
+
 /**
  * @hide
  */
@@ -228,11 +230,7 @@ public synchronized ParcelFileDescriptor establish(VpnConfig config) {
             mConnection = connection;
             mInterface = interfaze;
         } catch (RuntimeException e) {
-            try {
-                tun.close();
-            } catch (Exception ex) {
-                // ignore
-            }
+            IoUtils.closeQuietly(tun);
             throw e;
         }
         Log.i(TAG, "Established by " + config.user + " on " + mInterface);
@@ -442,11 +440,7 @@ public void exit() {
             // We assume that everything is reset after stopping the daemons.
             interrupt();
             for (LocalSocket socket : mSockets) {
-                try {
-                    socket.close();
-                } catch (Exception e) {
-                    // ignore
-                }
+                IoUtils.closeQuietly(socket);
             }
         }