Map +unix

MapCRtoLF :: TerminalMode
unix System.Posix.Terminal, unix System.Posix.Terminal.ByteString
MapLFtoCR :: TerminalMode
unix System.Posix.Terminal, unix System.Posix.Terminal.ByteString
data Semaphore
unix System.Posix.Semaphore
module System.Posix.Semaphore
unix System.Posix.Semaphore
POSIX named semaphore support.