Add close to input stream and cleanup socket and streams

runtime/bin/process_impl.dart

 // Copyright (c) 2011, 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.
 
 class _ProcessStartStatus {
   int _errorCode;  // Set to OS error code if process start failed.
   String _errorMessage;  // Set to OS error message if process start failed.
 }
 
 
@@ skipping 53 matching lines @@
     _started = true;
 
     // Make sure to activate socket handlers now that the file
     // descriptors have been set.
     _in._activateHandlers();
     _out._activateHandlers();
     _err._activateHandlers();
 
     // Setup an exit handler to handle internal cleanup and possible
     // callback when a process terminates.
-    _exitHandler.dataHandler = () {
+    _exitHandler.inputStream.dataHandler = () {
       final int EXIT_DATA_SIZE = 12;
       List<int> exitDataBuffer = new List<int>(EXIT_DATA_SIZE);
-      InputStream input = _exitHandler.inputStream;
       int exitDataRead = 0;
 
       int exitCode(List<int> ints) {
         var code = _intFromBytes(ints, 4);
         var negative = _intFromBytes(ints, 8);
         assert(negative == 0 || negative == 1);
         return (negative == 0) ? code : -code;
       }
 
       int exitPid(List<int> ints) {
         return _intFromBytes(ints, 0);
       }
 
       void handleExit() {
         _processExit(exitPid(exitDataBuffer));
         if (_exitHandlerCallback !== null) {
           _exitHandlerCallback(exitCode(exitDataBuffer));
         }
       }
 
-      void exitData() {
-        exitDataRead += input.readInto(
-            exitDataBuffer, exitDataRead, EXIT_DATA_SIZE - exitDataRead);
-        if (exitDataRead == EXIT_DATA_SIZE) handleExit();
-      }
-
-      input.dataHandler = exitData;
+      exitDataRead += _exitHandler.inputStream.readInto(
+          exitDataBuffer, exitDataRead, EXIT_DATA_SIZE - exitDataRead);
+      if (exitDataRead == EXIT_DATA_SIZE) handleExit();
     };
 
     if (_startHandler !== null) {
       _startHandler();
     }
   }
 
   bool _start(String path,
               List<String> arguments,
               Socket input,
@@ skipping 82 matching lines @@
   Socket _err;
   Socket _exitHandler;
   int _pid;
   bool _closed;
   bool _killed;
   bool _started;
   Function _exitHandlerCallback;
   Function _errorHandler;
   Function _startHandler;
 }