FilePathWatcher::Watch() - Listen for sub directory changes.

base/files/file_path_watcher_linux.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/files/file_path_watcher.h"
 
 #include <errno.h>
 #include <string.h>
 #include <sys/inotify.h>
 #include <sys/ioctl.h>
@@ skipping 82 matching lines @@
   // watch that fired, |child| indicates what has changed, and is relative to
   // the currently watched path for |fired_watch|. The flag |created| is true if
   // the object appears.
   void OnFilePathChanged(InotifyReader::Watch fired_watch,
                          const FilePath::StringType& child,
                          bool created);
 
   // Start watching |path| for changes and notify |delegate| on each change.
   // Returns true if watch for |path| has been added successfully.
   virtual bool Watch(const FilePath& path,
+                     bool recursive,
                      FilePathWatcher::Delegate* delegate) OVERRIDE;
 
   // Cancel the watch. This unregisters the instance with InotifyReader.
   virtual void Cancel() OVERRIDE;
 
   // Deletion of the FilePathWatcher will call Cancel() to dispose of this
   // object in the right thread. This also observes destruction of the required
   // cleanup thread, in case it quits before Cancel() is called.
   virtual void WillDestroyCurrentMessageLoop() OVERRIDE;
 
@@ skipping 241 matching lines @@
           (change_on_target_path && !created) ||
           (change_on_target_path && file_util::PathExists(target_))) {
         delegate_->OnFilePathChanged(target_);
         return;
       }
     }
   }
 }
 
 bool FilePathWatcherImpl::Watch(const FilePath& path,
+                                bool recursive,
                                 FilePathWatcher::Delegate* delegate) {
   DCHECK(target_.empty());
   DCHECK(MessageLoopForIO::current());
+  if (recursive) {
+    // Recursive watch is not supported on this platform.
+    NOTIMPLEMENTED();
+    return false;
+  }
 
   set_message_loop(base::MessageLoopProxy::current());
   delegate_ = delegate;
   target_ = path;
   MessageLoop::current()->AddDestructionObserver(this);
 
   std::vector<FilePath::StringType> comps;
   target_.GetComponents(&comps);
   DCHECK(!comps.empty());
   std::vector<FilePath::StringType>::const_iterator comp = comps.begin();
@@ skipping 97 matching lines @@
 }
 
 }  // namespace
 
 FilePathWatcher::FilePathWatcher() {
   impl_ = new FilePathWatcherImpl();
 }
 
 }  // namespace files
 }  // namespace base