[Haskell-beginners] daemons and signals

Hello, I'm trying to write a daemon that handles some signals. My problem is currently with the handling of posix signals. I don't think my signal handlers are being run. All they do at present is write to syslog and a file (for diagnostic purposes). I'm not seeing anything in /var/log/system.log (I'm on a mac). My code is attached. Any advice would be greatly appreciated. Thanks, Jeff