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{-# LANGUAGE CPP #-}
module Snap.Loader.Dynamic.Signal (protectHandlers) where
#ifdef mingw32_HOST_OS
-------------
-- windows --
-------------
------------------------------------------------------------------------------
import GHC.ConsoleHandler as C
saveHandlers :: IO C.Handler
saveHandlers = C.installHandler Ignore
restoreHandlers :: C.Handler -> IO ()
restoreHandlers h = C.installHandler h >> return ()
------------------------------------------------------------------------------
#else
-----------
-- posix --
-----------
------------------------------------------------------------------------------
import qualified System.Posix.Signals as S
helper :: S.Handler -> S.Signal -> IO S.Handler
helper handler signal = S.installHandler signal handler Nothing
signals :: [S.Signal]
signals = [ S.sigQUIT
, S.sigINT
, S.sigHUP
, S.sigTERM
]
saveHandlers :: IO [S.Handler]
saveHandlers = mapM (helper S.Ignore) signals
restoreHandlers :: [S.Handler] -> IO ()
restoreHandlers h = sequence_ $ zipWith helper h signals
------------------------------------------------------------------------------
#endif
----------
-- both --
----------
------------------------------------------------------------------------------
protectHandlers :: IO (IO ())
protectHandlers = do
h <- saveHandlers
return $ restoreHandlers h
------------------------------------------------------------------------------