module Snap.Loader.Dynamic.Signal (protectHandlers) where
import Control.Exception (bracket)
#ifdef mingw32_HOST_OS
import GHC.ConsoleHandler as C
saveHandlers :: IO C.Handler
saveHandlers = C.installHandler Ignore
restoreHandlers :: C.Handler -> IO C.Handler
restoreHandlers = C.installHandler
#else
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 [S.Handler]
restoreHandlers h = sequence $ zipWith helper h signals
#endif
protectHandlers :: IO a -> IO a
protectHandlers a = bracket saveHandlers restoreHandlers $ const a