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Monthly Downloads: 12
Programming language: Haskell
License: Mozilla Public License 2.0
Tags:
Foreign
Latest version: v0.2.0.0
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README
marshal-contt
A ContT-based wrapper for the bracket-style Haskell-to-C marshalling functions in base and bytestring.
Example:
type Argv = [BS.ByteString]
type Env = M.Map BS.ByteString BS.ByteString
allocStringArrayWith :: [BS.ByteString] -> ContT r IO (Ptr CString)
allocStringArrayWith = allocaArrayWith0' withCString
allocStringMapWith :: M.Map BS.ByteString BS.ByteString -> (Ptr CString -> IO a) -> IO a
allocStringMapWith = iallocaArrayWith0' (\(k, v) -> withCString $ k <> "=" <> v)
spawn :: FilePath -> [FileActions] -> Argv -> Env -> IO ProcessID
spawn path actions argv env = flip runContT return $ do
cPath <- withCString path
cAction <- withFileActions actions
cArgv <- allocStringArrayWith argv
cEnv <- marshalEnv env
pidPtr <- alloca
liftIO . throwErrnoIf_ (/= 0) path $
posix_spawn pidPtr cPath cActions nullSpawnAttrs cArgv cEnv
liftIO $ peek pidPtr
spawnp :: String -> [FileActions] -> Argv -> Env -> IO ProcessID
spawnp command actions argv env = flip runContT return $ do
cPath <- withCString path
cAction <- withFileActions actions
cArgv <- allocStringArrayWith argv
cEnv <- marshalEnv env
pidPtr <- alloca
liftIO . throwErrnoIf_ (/= 0) path $
posix_spawnp pidPtr cPath cActions nullSpawnAttrs cArgv cEnv
liftIO $ peek pidPtr