Make std* blocking file-descriptors.

sdk/lib/io/stdio.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.
 
 part of dart.io;
 
 const int _STDIO_HANDLE_TYPE_TERMINAL = 0;
 const int _STDIO_HANDLE_TYPE_PIPE = 1;
 const int _STDIO_HANDLE_TYPE_FILE = 2;
 const int _STDIO_HANDLE_TYPE_SOCKET = 3;
@@ skipping 255 matching lines @@
   }
   return _stderr;
 }
 
 
 /// For a stream, returns whether it is attached to a file, pipe, terminal, or
 /// something else.
 StdioType stdioType(object) {
   if (object is _StdStream) {
     object = object._stream;
-  } else if (object is _StdSink) {
-    object = object._sink;
+  } else if (object == stdout || object == stderr) {
+    switch (_StdIOUtils._getStdioHandleType(object == stdout ? 1 : 2)) {
+      case _STDIO_HANDLE_TYPE_TERMINAL: return StdioType.TERMINAL;
+      case _STDIO_HANDLE_TYPE_PIPE: return StdioType.PIPE;
+      case _STDIO_HANDLE_TYPE_FILE:  return StdioType.FILE;
+    }
   }
   if (object is _FileStream) {
     return StdioType.FILE;
   }
   if (object is Socket) {
     switch (_StdIOUtils._socketType(object._nativeSocket)) {
       case _STDIO_HANDLE_TYPE_TERMINAL: return StdioType.TERMINAL;
       case _STDIO_HANDLE_TYPE_PIPE: return StdioType.PIPE;
       case _STDIO_HANDLE_TYPE_FILE:  return StdioType.FILE;
     }
   }
   if (object is IOSink) {
     try {
       if (object._target is _FileStreamConsumer) {
         return StdioType.FILE;
       }
     } catch (e) {
       // Only the interface implemented, _sink not available.
     }
   }
   return StdioType.OTHER;
 }
 
 
 class _StdIOUtils {
   external static _getStdioOutputStream(int fd);
   external static Stdin _getStdioInputStream();
   external static int _socketType(nativeSocket);
+  external static _getStdioHandleType(int fd);
 }