Make std* blocking file-descriptors.

runtime/bin/stdio_patch.dart

 // 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 Stdin _getStdioInputStream() {
     switch (_getStdioHandleType(0)) {
       case _STDIO_HANDLE_TYPE_TERMINAL:
       case _STDIO_HANDLE_TYPE_PIPE:
       case _STDIO_HANDLE_TYPE_SOCKET:
@@ skipping 11 matching lines @@
         return new Stdout._(sink);
       } else {
         return new _StdSink(sink);
       }
     }
     assert(fd == 1 || fd == 2);
     switch (_getStdioHandleType(fd)) {
       case _STDIO_HANDLE_TYPE_TERMINAL:
       case _STDIO_HANDLE_TYPE_PIPE:
       case _STDIO_HANDLE_TYPE_SOCKET:
-        return wrap(new _Socket._writePipe(fd));
       case _STDIO_HANDLE_TYPE_FILE:
         return wrap(new IOSink(new _FileStreamConsumer.fromStdio(fd)));
       default:
         throw new FileSystemException("Unsupported stdin type");
     }
   }
 
   static int _socketType(nativeSocket) {
     var result = _getSocketType(nativeSocket);
     if (result is OSError) {
       throw new FileSystemException("Error retreiving socket type", result);
     }
     return result;
   }
+
+  static _getStdioHandleType(int fd) native "File_GetStdioHandleType";
 }
 
 patch class Stdin {
   /* patch */ int readByteSync() native "Stdin_ReadByte";
 
   /* patch */ bool get echoMode => _echoMode;
   /* patch */ void set echoMode(bool enabled) { _echoMode = enabled; }
 
   /* patch */ bool get lineMode => _lineMode;
   /* patch */ void set lineMode(bool enabled) { _lineMode = enabled; }
@@ skipping 23 matching lines @@
       throw new StdoutException("Could not get terminal size", size);
     }
     return size;
   }
 
   static _getTerminalSize() native "Stdout_GetTerminalSize";
 }
 
 
 _getStdioHandle(_NativeSocket socket, int num) native "Socket_GetStdioHandle";
-_getStdioHandleType(int num) native "File_GetStdioHandleType";
 _getSocketType(_NativeSocket nativeSocket) native "Socket_GetType";