flock and sockets

I am planning a Haskell project and I need to access files. Since the program will be automatically started whenever a mail comes in I will need to be able to lock the access to files. Is there any support for this in some library? The second option that I have is to use a daemon and let the programs that get started by mail connect via some sort of socket. Is there any socket support in Haskell? #Luna -- Daniel Luna | Top reasons that I have a beard: luna@update.uu.se | a) Laziness. http://www.update.uu.se/~luna/ | b) I can. Don't look at my homepage (it stinks).| c) I can get away with it.