Portable Directory/File watch library in C / C++

Is there a portable library to watch for filesystem changes without polling?

I开发者_C百科 know there is

• inotify for Linux
• solution for osx
• FindFirstChangeNotificationfor Windows
• NIO.2 for Java
• System.IO.FileSystemWatcher for .NET

but i have not found any portable wrapper for those.

Is there a portable wrapper for Linux, Windows and OS X or a subset of those?

QFileSystemWatcher -- Qt is very cross-platform.

Have a look at jnotify. It's written in java and can run on all the major OSes.