New OutputStream interface

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 31 matching lines @@
   void start() {
     var status = new _ProcessStartStatus();
     bool success = _start(
         _path, _arguments, _in, _out, _err, _exitHandler, status);
     if (!success) {
       close();
       throw new ProcessException(status._errorMessage, status._errorCode);
     }
     _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.setDataHandler(() {
         final int EXIT_DATA_SIZE = 8;
         List<int> exitDataBuffer = new List<int>(EXIT_DATA_SIZE);
         InputStream input = _exitHandler.inputStream;
         int exitDataRead = 0;
 
         int exitCode(List<int> ints) {
           return ints[4] + (ints[5] << 8) + (ints[6] << 16) + (ints[7] << 24);
@@ skipping 93 matching lines @@
   Socket _in;
   Socket _out;
   Socket _err;
   Socket _exitHandler;
   int _pid;
   bool _closed;
   bool _killed;
   bool _started;
   var _exitHandlerCallback;
 }