Handle stdio redirection in standalone VM

runtime/bin/file_impl.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.
 
 class _FileInputStream extends _BaseDataInputStream implements InputStream {
   _FileInputStream(File file) {
     _file = file.openSync();
     _length = _file.lengthSync();
     _streamMarkedClosed = true;
     _checkScheduleCallbacks();
   }
 
+  _FileInputStream.fromStdio(int fd) {
+    assert(fd == 0);
+    _file = _File._openStdioSync(fd);
+    _length = _file.lengthSync();
+    _streamMarkedClosed = true;
+    _checkScheduleCallbacks();
+  }
+
   int available() {
     return _closed ? 0 : _length - _file.positionSync();
   }
 
   void pipe(OutputStream output, [bool close = true]) {
     _pipe(this, output, close: close);
   }
 
   List<int> _read(int bytesToRead) {
     ByteArray result = new ByteArray(bytesToRead);
@@ skipping 23 matching lines @@
   int _length;
   bool _closed = false;
 }
 
 
 class _FileOutputStream implements OutputStream {
   _FileOutputStream(File file, FileMode mode) {
     _file = file.openSync(mode);
   }
 
+  _FileOutputStream.fromStdio(int fd) {
+    assert(1 <= fd && fd <= 2);
+    _file = _File._openStdioSync(fd);
+  }
+
   bool write(List<int> buffer, [bool copyBuffer = false]) {
     return _write(buffer, 0, buffer.length);
   }
 
   bool writeFrom(List<int> buffer, [int offset = 0, int len]) {
     return _write(
         buffer, offset, (len == null) ? buffer.length - offset : len);
   }
 
   void close() {
@@ skipping 379 matching lines @@
     return writeListNative(id, outBuffer, outOffset, bytes);
   }
   static int writeListNative(int id, List<int> buffer, int offset, int bytes)
       native "File_WriteList";
   static int writeString(int id, String string) native "File_WriteString";
   static int position(int id) native "File_Position";
   static bool setPosition(int id, int position) native "File_SetPosition";
   static bool truncate(int id, int length) native "File_Truncate";
   static int length(int id) native "File_Length";
   static int flush(int id) native "File_Flush";
+  static int openStdio(int fd) native "File_OpenStdio";
 
   static int checkedOpen(String name, int mode) {
     if (name is !String || mode is !int) return 0;
     return open(name, mode);
   }
 
   static bool checkedCreate(String name) {
     if (name is !String) return false;
     return create(name);
   }
@@ skipping 146 matching lines @@
       throw new FileIOException("Unknown file mode. Use FileMode.READ, " +
                                 "FileMode.WRITE or FileMode.APPEND.");
     }
     var id = _FileUtils.checkedOpen(_name, mode._mode);
     if (id == 0) {
       throw new FileIOException("Cannot open file: $_name");
     }
     return new _RandomAccessFile(id, _name);
   }
 
+  static RandomAccessFile _openStdioSync(int fd) {
+    var id = _FileUtils.openStdio(fd);
+    if (id == 0) {
+      throw new FileIOException("Cannot open stdio file for: $fd");
+    }
+    return new _RandomAccessFile(id, "");
+  }
+
   void fullPath() {
     _asyncUsed = true;
     var handleFullPathResult = (result, ignored) {
       var handler = _fullPathHandler;
       if (handler == null) handler = (path) => null;
       if (result != null) {
         handler(result);
       } else if (_errorHandler != null) {
         _errorHandler("fullPath failed");
       }
@@ skipping 466 matching lines @@
   var _readByteHandler;
   var _readListHandler;
   var _noPendingWriteHandler;
   var _positionHandler;
   var _setPositionHandler;
   var _truncateHandler;
   var _lengthHandler;
   var _flushHandler;
   var _errorHandler;
 }