Throw exception if path can't be watched.

runtime/bin/file_patch.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.
 
 patch class _FileUtils {
   /* patch */ static SendPort _newServicePort() native "File_NewServicePort";
 }
 
 patch class _File {
   /* patch */ static _exists(String path) native "File_Exists";
@@ skipping 60 matching lines @@
   void _listen() {
     int socketId;
     try {
       socketId = _watchPath(_path, _events, identical(true, _recursive));
     } catch (e) {
       throw new FileException(
           "Failed to watch path",
           _path,
           e);
     }
+    print(socketId);

[zra, 2013/09/24 20:08:11]

Is this a leftover debug print?

[Anders Johnsen, 2013/09/24 20:12:31]

Heh, yep, too fast a fix :)

     var socket = new _RawSocket(new _NativeSocket.watch(socketId));
     _subscription = socket.expand((event) {
       var events = [];
       var pair = {};
       if (event == RawSocketEvent.READ) {
         String getPath(event) {
           var path = _path;
           if (event[2] != null) {
             path += Platform.pathSeparator;
             path += event[2];
@@ skipping 59 matching lines @@
 
   int _watchPath(String path, int events, bool recursive)
       native "FileSystemWatcher_WatchPath";
   void _unwatchPath() native "FileSystemWatcher_UnwatchPath";
   List _readEvents() native "FileSystemWatcher_ReadEvents";
 }
 
 Uint8List _makeUint8ListView(Uint8List source, int offsetInBytes, int length) {
   return new Uint8List.view(source.buffer, offsetInBytes, length);
 }