Added builtin native call to exit the running vm

samples/total/src/TotalRunner.dart

 #!/usr/bin/env dart
 // Copyright (c) 2011, 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("total:runner");
 
 typedef void ExitCallback(int status, String exitString);
 
 void main() {
   String SERVER_EXEC_PATH = './TotalServer.dart';
-  String RESTART = "GRACEFUL RESTART!!";
-  String EXIT = "GRACEFUL EXIT!!";
+  final int RESTART_STATUS = 42;
+  final int EXIT_STATUS = 0;
 
   void keepServerRunning(int status, ServerRunner runner) {
-    switch (runner.lastExitString) {
-      case RESTART:
+    switch (status) {
+      case RESTART_STATUS:
         runner.run(keepServerRunning);
         break;
-      case EXIT:
+      case EXIT_STATUS:
         break;
       default:
-        print("ERROR: exiting due to unknown condition. Exit status: $status."
-              + " Exit string: '${runner.lastExitString}'");
+        print("ERROR: exiting due to unknown condition. Exit status: $status.");
         break;
     }
   }
 
-  new ServerRunner(SERVER_EXEC_PATH, [RESTART, EXIT]).run(keepServerRunning);
+  new ServerRunner(SERVER_EXEC_PATH).run(keepServerRunning);
 }
 
 class ServerRunner {
-  List<String> _exitStrings;
   String _serverMain;
 
   // TODO: fix this to use a bigger buffer when streams work better
   int _BUFSIZE = 1;
 
-  String lastExitString;
-
   // TODO: Release or Debug? We should be able to find automatically
   static final DART_EXEC_PATH = '../../../runtime/out/Release_ia32/dart_bin';
   static final CR = 0x0d;
   static final LF = 0x0a;
 
-  ServerRunner(String this._serverMain, List<String> this._exitStrings);
+  ServerRunner(String this._serverMain);
 
   void run(ExitCallback exitCallback) {
     Process dart = new Process(DART_EXEC_PATH, [_serverMain]);
 
     dart.setExitHandler((int status) {
         dart.close();
         exitCallback(status, this);
       });
 
     dart.start();
@@ skipping 13 matching lines @@
 
   void processBuffer(List<int> buf, StringBuffer readSoFar) {
     buf.forEach((int i) {
         if (i != CR && i != LF) {
           readSoFar.add(new String.fromCharCodes([i]));
         } else {
           String line = readSoFar.toString();
           readSoFar.clear();
           if (line.length != 0) {
             print(line);
-            _updateLastExitString(line);
           }
         }
       });
   }
-
-  void _updateLastExitString(String line) {
-    _exitStrings.some((String e) {
-        if (line.contains(e, 0)) {
-          lastExitString = e;
-          return true;
-        } else {
-          return false;
-        }
-      });
-  }
-
 }