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Showing content from http://hackage.haskell.org/packages/archive/base/4.6.0.0/doc/html/src/GHC-IO-Exception.html below:

GHC/IO/Exception.hs

module GHC.IO.Exception (
  BlockedIndefinitelyOnMVar(..), blockedIndefinitelyOnMVar,
  BlockedIndefinitelyOnSTM(..), blockedIndefinitelyOnSTM,
  Deadlock(..),
  AssertionFailed(..),
  AsyncException(..), stackOverflow, heapOverflow,
  ArrayException(..),
  ExitCode(..),

  ioException,
  ioError,
  IOError,
  IOException(..),
  IOErrorType(..),
  userError,
  assertError,
  unsupportedOperation,
  untangle,
 ) where

import GHC.Base
import GHC.List
import GHC.IO
import GHC.Show
import GHC.Read
import GHC.Exception
import Data.Maybe
import GHC.IO.Handle.Types
import Foreign.C.Types

import Data.Typeable     ( Typeable )






data BlockedIndefinitelyOnMVar = BlockedIndefinitelyOnMVar
    deriving Typeable

instance Exception BlockedIndefinitelyOnMVar

instance Show BlockedIndefinitelyOnMVar where
    showsPrec _ BlockedIndefinitelyOnMVar = showString "thread blocked indefinitely in an MVar operation"

blockedIndefinitelyOnMVar :: SomeException 
blockedIndefinitelyOnMVar = toException BlockedIndefinitelyOnMVar





data BlockedIndefinitelyOnSTM = BlockedIndefinitelyOnSTM
    deriving Typeable

instance Exception BlockedIndefinitelyOnSTM

instance Show BlockedIndefinitelyOnSTM where
    showsPrec _ BlockedIndefinitelyOnSTM = showString "thread blocked indefinitely in an STM transaction"

blockedIndefinitelyOnSTM :: SomeException 
blockedIndefinitelyOnSTM = toException BlockedIndefinitelyOnSTM





data Deadlock = Deadlock
    deriving Typeable

instance Exception Deadlock

instance Show Deadlock where
    showsPrec _ Deadlock = showString "<<deadlock>>"




data AssertionFailed = AssertionFailed String
    deriving Typeable

instance Exception AssertionFailed

instance Show AssertionFailed where
    showsPrec _ (AssertionFailed err) = showString err




data AsyncException
  = StackOverflow
        
        
        
        
        
  | HeapOverflow
        
        
        
        
        
        
        
  | ThreadKilled
        
        
        
        
  | UserInterrupt
        
        
        
  deriving (Eq, Ord, Typeable)

instance Exception AsyncException


data ArrayException
  = IndexOutOfBounds    String
        
        
  | UndefinedElement    String
        
        
  deriving (Eq, Ord, Typeable)

instance Exception ArrayException

stackOverflow, heapOverflow :: SomeException 
stackOverflow = toException StackOverflow
heapOverflow  = toException HeapOverflow

instance Show AsyncException where
  showsPrec _ StackOverflow   = showString "stack overflow"
  showsPrec _ HeapOverflow    = showString "heap overflow"
  showsPrec _ ThreadKilled    = showString "thread killed"
  showsPrec _ UserInterrupt   = showString "user interrupt"

instance Show ArrayException where
  showsPrec _ (IndexOutOfBounds s)
        = showString "array index out of range"
        . (if not (null s) then showString ": " . showString s
                           else id)
  showsPrec _ (UndefinedElement s)
        = showString "undefined array element"
        . (if not (null s) then showString ": " . showString s
                           else id)








data ExitCode
  = ExitSuccess 
  | ExitFailure Int
                
                
                
                
  deriving (Eq, Ord, Read, Show, Typeable)

instance Exception ExitCode

ioException     :: IOException -> IO a
ioException err = throwIO err


ioError         :: IOError -> IO a 
ioError         =  ioException










type IOError = IOException





data IOException
 = IOError {
     ioe_handle   :: Maybe Handle,   
                                     
     ioe_type     :: IOErrorType,    
     ioe_location :: String,         
     ioe_description :: String,      
     ioe_errno    :: Maybe CInt,     
     ioe_filename :: Maybe FilePath  
   }
    deriving Typeable

instance Exception IOException

instance Eq IOException where
  (IOError h1 e1 loc1 str1 en1 fn1) == (IOError h2 e2 loc2 str2 en2 fn2) = 
    e1==e2 && str1==str2 && h1==h2 && loc1==loc2 && en1==en2 && fn1==fn2


data IOErrorType
  
  = AlreadyExists
  | NoSuchThing
  | ResourceBusy
  | ResourceExhausted
  | EOF
  | IllegalOperation
  | PermissionDenied
  | UserError
  
  | UnsatisfiedConstraints
  | SystemError
  | ProtocolError
  | OtherError
  | InvalidArgument
  | InappropriateType
  | HardwareFault
  | UnsupportedOperation
  | TimeExpired
  | ResourceVanished
  | Interrupted

instance Eq IOErrorType where
   x == y = getTag x ==# getTag y
 
instance Show IOErrorType where
  showsPrec _ e =
    showString $
    case e of
      AlreadyExists     -> "already exists"
      NoSuchThing       -> "does not exist"
      ResourceBusy      -> "resource busy"
      ResourceExhausted -> "resource exhausted"
      EOF               -> "end of file"
      IllegalOperation  -> "illegal operation"
      PermissionDenied  -> "permission denied"
      UserError         -> "user error"
      HardwareFault     -> "hardware fault"
      InappropriateType -> "inappropriate type"
      Interrupted       -> "interrupted"
      InvalidArgument   -> "invalid argument"
      OtherError        -> "failed"
      ProtocolError     -> "protocol error"
      ResourceVanished  -> "resource vanished"
      SystemError       -> "system error"
      TimeExpired       -> "timeout"
      UnsatisfiedConstraints -> "unsatisified constraints" 
      UnsupportedOperation -> "unsupported operation"









userError       :: String  -> IOError
userError str   =  IOError Nothing UserError "" str Nothing Nothing




instance Show IOException where
    showsPrec p (IOError hdl iot loc s _ fn) =
      (case fn of
         Nothing -> case hdl of
                        Nothing -> id
                        Just h  -> showsPrec p h . showString ": "
         Just name -> showString name . showString ": ") .
      (case loc of
         "" -> id
         _  -> showString loc . showString ": ") .
      showsPrec p iot . 
      (case s of
         "" -> id
         _  -> showString " (" . showString s . showString ")")




assertError :: Addr# -> Bool -> a -> a
assertError str predicate v
  | predicate = lazy v
  | otherwise = throw (AssertionFailed (untangle str "Assertion failed"))

unsupportedOperation :: IOError
unsupportedOperation = 
   (IOError Nothing UnsupportedOperation ""
        "Operation is not supported" Nothing Nothing)


untangle :: Addr# -> String -> String
untangle coded message
  =  location
  ++ ": "
  ++ message
  ++ details
  ++ "\n"
  where
    coded_str = unpackCStringUtf8# coded

    (location, details)
      = case (span not_bar coded_str) of { (loc, rest) ->
        case rest of
          ('|':det) -> (loc, ' ' : det)
          _         -> (loc, "")
        }
    not_bar c = c /= '|'

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