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{-# LANGUAGE RecordWildCards #-}
module Main (main) where
import Control.Exception
import Control.Monad
import Foreign
import Types
import System.Environment
import System.Posix.DynamicLinker
import GHCi.ObjLink
rotateSO
:: (FunPtr (IO (StablePtr a)) -> (IO (StablePtr a)))
-> String
-> (Maybe FilePath, FilePath)
-> IO a
rotateSO dynamicCall symName (old, newDLL) = do
-- initObjLinker is idempotent
initObjLinker DontRetainCAFs
loadObj newDLL
resolved <- resolveObjs
unless resolved $
throwIO (ErrorCall $ "Unable to resolve objects for " ++ newDLL)
c_sym <- lookupSymbol symName
h <- case c_sym of
Nothing -> throwIO (ErrorCall "Could not find symbol")
Just p_sym ->
bracket (dynamicCall $ castPtrToFunPtr p_sym) freeStablePtr deRefStablePtr
purgeObj newDLL
forM_ old unloadObj
return h
foreign import ccall "dynamic"
mkCallable :: FunPtr SOHandleExport -> SOHandleExport
main :: IO ()
main = do
[file] <- getArgs
SOHandles{..} <- rotateSO mkCallable "hs_soHandles" (Nothing, file)
someFn 7
putStrLn $ "someData = " ++ show someData
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