Error checking for Stdio calls

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 198 matching lines @@
   final String message;
   final OSError osError;
 
   const StdoutException(this.message, [this.osError]);
 
   String toString() {
     return "StdoutException: $message${osError == null ? "" : ", $osError"}";
   }
 }
 
+
+class StdinException implements IOException {
+  final String message;
+  final OSError osError;
+
+  const StdinException(this.message, [this.osError]);
+
+  String toString() {
+    return "StdinException: $message${osError == null ? "" : ", $osError"}";
+  }
+}
+
+
 class _StdConsumer implements StreamConsumer<List<int>> {
   final _file;
 
   _StdConsumer(int fd) : _file = _File._openStdioSync(fd);
 
   Future addStream(Stream<List<int>> stream) {
     var completer = new Completer();
     var sub;
     sub = stream.listen(
         (data) {
@@ skipping 123 matching lines @@
 }
 
 
 class _StdIOUtils {
   external static _getStdioOutputStream(int fd);
   external static Stdin _getStdioInputStream();
   /// Returns the socket type or `null` if [socket] is not a builtin socket.
   external static int _socketType(Socket socket);
   external static _getStdioHandleType(int fd);
 }