Haskell: Monitor a file without polling (à la inotify in linux)

Is there a haskell library function to monitor a file without polling? With polling i would do someting like this: ``` monitor file mtime handler = do threadDelay n -- sleep `n` ns t <- getModificationTime file if t > mtime then handler >> monitor file t handler else monitor file mtime handler ``` What I want is something like a blocking getModificationTime which will be woken up by the system. Is there something available? I would be perfectly happy if it was available for posix systems only, but the more portable the better :-) Edit: I know hinotify, but I'm on a Mac (that's why I mention POSIX).