Exit stdio-based analysis server when stdin closed.

pkg/analysis_server/lib/stdio_server.dart

 // Copyright (c) 2014, 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.
 
 library stdio.server;
 
+import 'dart:async';
 import 'dart:io';
 
 import 'package:analysis_server/src/channel.dart';
 import 'package:analysis_server/src/socket_server.dart';
 
 /**
  * Instances of the class [StdioServer] implement a simple server operating
  * over standard input and output. The primary responsibility of this server
  * is to split incoming messages on newlines and pass them along to the
  * analysis server.
  */
 class StdioAnalysisServer {
   /**
    * An object that can handle either a WebSocket connection or a connection
    * to the client over stdio.
    */
   SocketServer socketServer;
 
   /**
    * Initialize a newly created stdio server.
    */
   StdioAnalysisServer(this.socketServer);
 
   /**
    * Begin serving requests over stdio.
+   *
+   * Return a future that will be completed when stdin closes.
    */
-  void serveStdio() {
-    socketServer.createAnalysisServer(new ByteStreamServerChannel(stdin, stdout)
-        );
+  Future serveStdio() {
+    ByteStreamServerChannel serverChannel = new ByteStreamServerChannel(stdin,
+        stdout);
+    socketServer.createAnalysisServer(serverChannel);
+    return serverChannel.closed;
   }
 }