POSIX Errors

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# 7.8. POSIX Errors

    getErrorCode :: IO ErrorCode

`getErrorCode` returns the current value of the external variable `errno`. It never fails.

    setErrorCode :: ErrorCode -> IO ()

`setErrorCode err` sets the external variable `errno` to `err`. It never fails.

    noError :: ErrorCode
    noError = 0

    argumentListTooLong, e2BIG              :: ErrorCode
    badFd, eBADF                            :: ErrorCode
    brokenPipe, ePIPE                       :: ErrorCode
    directoryNotEmpty, eNOTEMPTY            :: ErrorCode
    execFormatError, eNOEXEC                :: ErrorCode
    fileAlreadyExists, eEXIST               :: ErrorCode
    fileTooLarge, eFBIG                     :: ErrorCode
    filenameTooLong, eNAMETOOLONG           :: ErrorCode
    improperLink, eXDEV                     :: ErrorCode
    inappropriateIOControlOperation, eNOTTY :: ErrorCode
    inputOutputError, eIO                   :: ErrorCode
    interruptedOperation, eINTR             :: ErrorCode
    invalidArgument, eINVAL                 :: ErrorCode
    invalidSeek, eSPIPE                     :: ErrorCode
    isADirectory, eISDIR                    :: ErrorCode
    noChildProcess, eCHILD                  :: ErrorCode
    noLocksAvailable, eNOLCK                :: ErrorCode
    noSpaceLeftOnDevice, eNOSPC             :: ErrorCode
    noSuchOperationOnDevice, eNODEV         :: ErrorCode
    noSuchDeviceOrAddress, eNXIO            :: ErrorCode
    noSuchFileOrDirectory, eNOENT           :: ErrorCode
    noSuchProcess, eSRCH                    :: ErrorCode
    notADirectory, eNOTDIR                  :: ErrorCode
    notEnoughMemory, eNOMEM                 :: ErrorCode
    operationNotImplemented, eNOSYS         :: ErrorCode
    operationNotPermitted, ePERM            :: ErrorCode
    permissionDenied, eACCES                :: ErrorCode
    readOnlyFileSystem, eROFS               :: ErrorCode
    resourceBusy, eBUSY                     :: ErrorCode
    resourceDeadlockAvoided, eDEADLK        :: ErrorCode
    resourceTemporarilyUnavailable, eAGAIN  :: ErrorCode
    tooManyLinks, eMLINK                    :: ErrorCode
    tooManyOpenFiles, eMFILE                :: ErrorCode
    tooManyOpenFilesInSystem, eNFILE        :: ErrorCode

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