Use patching for dart:io.

runtime/bin/stdio.dart

-// Copyright (c) 2012, 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.
-
-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;
-const int _STDIO_HANDLE_TYPE_OTHER = -1;
-
-
-InputStream _stdin;
-OutputStream _stdout;
-OutputStream _stderr;
-
-
-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();
-      _getStdioHandle(s, 0);
-      s._closed = false;
-      return s.inputStream;
-    case _STDIO_HANDLE_TYPE_FILE:
-      return new _FileInputStream.fromStdio(0);
-    default:
-      throw new FileIOException("Unsupported stdin type");
-  }
-}
-
-
-OutputStream _getStdioOutputStream(int fd) {
-  assert(fd == 1 || fd == 2);
-  switch (_getStdioHandleType(fd)) {
-    case _STDIO_HANDLE_TYPE_TERMINAL:
-    case _STDIO_HANDLE_TYPE_PIPE:
-    case _STDIO_HANDLE_TYPE_SOCKET:
-      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");
-  }
-}
-
-
-InputStream get stdin {
-  if (_stdin == null) {
-    _stdin = _getStdioInputStream();
-  }
-  return _stdin;
-}
-
-
-OutputStream get stdout {
-  if (_stdout == null) {
-    _stdout = _getStdioOutputStream(1);
-  }
-  return _stdout;
-}
-
-
-OutputStream get stderr {
-  if (_stderr == null) {
-    _stderr = _getStdioOutputStream(2);
-  }
-  return _stderr;
-}
-
-_getStdioHandle(Socket socket, int num) native "Socket_GetStdioHandle";
-_getStdioHandleType(int num) native "File_GetStdioHandleType";