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Posix data types

data ByteCount  -- instances of : Eq Ord Num Real Integral Ix Enum Show
A `ByteCount' is a primitive of type `unsigned'. At a minimum, an conforming implementation must support values in the range `[0, UINT_MAX]'. 
data ClockTick  -- instances of : Eq Ord Num Real Integral Ix Enum Show
A `ClockTick' is a primitive of type `clock_t', which is used to measure intervals of time in fractions of a second. The resolution is determined by `getSysVar ClockTick'. 
data DeviceID  -- instances of : Eq Ord Num Real Integral Ix Enum Show
A `DeviceID' is a primitive of type `dev_t'. It must be an arithmetic type. 
data EpochTime -- instances of : Eq Ord Num Real Integral Ix Enum Show
A `EpochTime' is a primitive of type `time_t', which is used to measure seconds since the Epoch. At a minimum, the implementation must support values in the range `[0, INT_MAX]'. 
data FileID -- instances of : Eq Ord Num Real Integral Ix Enum Show
A `FileID' is a primitive of type `ino_t'. It must be an arithmetic type. 
data FileMode -- instances of : Eq Ord Num Real Integral Ix Enum Show
A `FileMode' is a primitive of type `mode_t'. It must be an arithmetic type. 
data FileOffset -- instances of : Eq Ord Num Real Integral Ix Enum Show
A `FileOffset' is a primitive of type `off_t'. It must be an arithmetic type. 
data GroupID -- instances of : Eq Ord Num Real Integral Ix Enum Show
A `GroupID' is a primitive of type `gid_t'. It must be an arithmetic type. 
data Limit -- instances of : Eq Ord Num Real Integral Ix Enum Show
A `Limit' is a primitive of type `long'. At a minimum, the implementation must support values in the range `[LONG_MIN, LONG_MAX]'. 
data LinkCount -- instances of : Eq Ord Num Real Integral Ix Enum Show
A `LinkCount' is a primitive of type `nlink_t'. It must be an arithmetic type. 
data ProcessID -- instances of : Eq Ord Num Real Integral Ix Enum Show
type ProcessGroupID = ProcessID
A `ProcessID' is a primitive of type `pid_t'. It must be a signed arithmetic type. 
data UserID -- instances of : Eq Ord Num Real Integral Ix Enum Show
A `UserID' is a primitive of type `uid_t'. It must be an arithmetic type. 
data DirStream
A `DirStream' is a primitive of type `DIR *'. 
data FileStatus
A `FileStatus' is a primitive of type `struct stat'. 
data GroupEntry
A `GroupEntry' is a primitive of type `struct group'. 
data ProcessTimes
`ProcessTimes' is a primitive structure containing a `clock_t' and a `struct tms'. 
data SignalSet
An `SignalSet' is a primitive of type `sigset_t'. 
data SystemID
A `SystemID' is a primitive of type `struct utsname'. 
data TerminalAttributes
`TerminalAttributes' is a primitive of type `struct termios'. 
data UserEntry
A `UserEntry' is a primitive of type `struct passwd'. 
data BaudRate = B0 | B50 | B75 | B110 | B134 | B150 | B200 | B300 | B600
              | B1200 | B1800 | B2400 | B4800 | B9600 | B19200 | B38400
              deriving (Eq, Show)

data Fd 

intToFd :: Int -> Fd -- use with care.

data FdOption = AppendOnWrite
              | CloseOnExec
              | NonBlockingRead

data ControlCharacter = EndOfFile
                      | EndOfLine
                      | Erase
                      | Interrupt
                      | Kill
                      | Quit
                      | Suspend
                      | Start
                      | Stop

type ErrorCode = Int

type FileLock = (LockRequest, SeekMode, FileOffset, FileOffset)
--                            whence    start       length

data FlowAction = SuspendOutput | RestartOutput | TransmitStop | TransmitStart

data Handler = Default | Ignore | Catch (IO ())

data LockRequest = ReadLock | WriteLock | Unlock
                 deriving (Eq, Show)

data OpenMode = ReadOnly | WriteOnly | ReadWrite

data PathVar = LinkLimit
             | InputLineLimit
             | InputQueueLimit
             | FileNameLimit
             | PathNameLimit
             | PipeBufferLimit
             | SetOwnerAndGroupIsRestricted
             | FileNamesAreNotTruncated

data QueueSelector = InputQueue | OutputQueue | BothQueues

type Signal = Int

data SysVar = ArgumentLimit
            | ChildLimit
            | ClockTick
            | GroupLimit
            | OpenFileLimit
            | PosixVersion
            | HasSavedIDs
            | HasJobControl

data TerminalMode = InterruptOnBreak       -- BRKINT
                | MapCRtoLF                -- ICRNL
                | IgnoreBreak              -- IGNBRK
                | IgnoreCR                 -- IGNCR
                | IgnoreParityErrors       -- IGNPAR
                | MapLFtoCR                -- INLCR
                | CheckParity              -- INPCK
                | StripHighBit             -- ISTRIP
                | StartStopInput           -- IXOFF
                | StartStopOutput          -- IXON
                | MarkParityErrors         -- PARMRK
                | ProcessOutput            -- OPOST
                | LocalMode                -- CLOCAL
                | ReadEnable               -- CREAD
                | TwoStopBits              -- CSTOPB
                | HangupOnClose            -- HUPCL
                | EnableParity             -- PARENB
                | OddParity                -- PARODD
                | EnableEcho               -- ECHO
                | EchoErase                -- ECHOE
                | EchoKill                 -- ECHOK
                | EchoLF                   -- ECHONL
                | ProcessInput             -- ICANON
                | ExtendedFunctions        -- IEXTEN
                | KeyboardInterrupts       -- ISIG
                | NoFlushOnInterrupt       -- NOFLSH
                | BackgroundWriteInterrupt -- TOSTOP

data TerminalState = Immediately | WhenDrained | WhenFlushed

data ProcessStatus = Exited ExitCode 
                   | Terminated Signal 
                   | Stopped Signal
                   deriving (Eq, Show)
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