Add function for finding what a InputStream or OutputStream is attached to

runtime/bin/stdio_patch.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 patch class _StdIOUtils {
   static InputStream _getStdioInputStream() {
     switch (_getStdioHandleType(0)) {
       case _STDIO_HANDLE_TYPE_TERMINAL:
       case _STDIO_HANDLE_TYPE_PIPE:
       case _STDIO_HANDLE_TYPE_SOCKET:
         Socket s = new _Socket._internalReadOnly();
@@ skipping 16 matching lines @@
         Socket s = new _Socket._internalWriteOnly();
         _getStdioHandle(s, fd);
         s._closed = false;
         return s.outputStream;
       case _STDIO_HANDLE_TYPE_FILE:
         return new _FileOutputStream.fromStdio(fd);
       default:
         throw new FileIOException("Unsupported stdin type");
     }
   }
+
+  static int _socketType(Socket socket) {
+    return _getSocketType(socket);
+  }
 }
 
+
 _getStdioHandle(Socket socket, int num) native "Socket_GetStdioHandle";
-_getStdioHandleType(int num) native "File_GetStdioHandleType";
+_getStdioHandleType(int num) native "File_GetStdioHandleType";
+_getSocketType(Socket socket) native "Socket_GetType";