{-# LINE 1 "libraries/unix/System/Posix/DynamicLinker/Module/ByteString.hsc" #-}
{-# LANGUAGE Safe #-}

-----------------------------------------------------------------------------
-- |
-- Module      :  System.Posix.DynamicLinker.Module.ByteString
-- Copyright   :  (c) Volker Stolz <vs@foldr.org> 2003
-- License     :  BSD-style (see the file libraries/base/LICENSE)
--
-- Maintainer  :  vs@foldr.org
-- Stability   :  provisional
-- Portability :  non-portable (requires POSIX)
--
-- DLOpen support, old API
--  Derived from GModule.chs by M.Weber & M.Chakravarty which is part of c2hs
--  I left the API more or less the same, mostly the flags are different.
--
-----------------------------------------------------------------------------

module System.Posix.DynamicLinker.Module.ByteString (

--  Usage:
--  ******
--
--  Let's assume you want to open a local shared library 'foo' (./libfoo.so)
--  offering a function
--    char * mogrify (char*,int)
--  and invoke str = mogrify("test",1):
--
--  type Fun = CString -> Int -> IO CString
--  foreign import dynamic unsafe fun__ :: FunPtr Fun -> Fun
--
--  withModule (Just ".") ("libfoo.so") [RTLD_NOW] $ \ mod -> do
--     funptr <- moduleSymbol mod "mogrify"
--     let fun = fun__ funptr
--     withCString "test" $ \ str -> do
--       strptr <- fun str 1
--       strstr <- peekCString strptr
--       ...

      Module
    , moduleOpen             -- :: String -> ModuleFlags -> IO Module
    , moduleSymbol           -- :: Source -> String -> IO (FunPtr a)
    , moduleClose            -- :: Module -> IO Bool
    , moduleError            -- :: IO String
    , withModule             -- :: Maybe String
                             -- -> String
                             -- -> [ModuleFlags ]
                             -- -> (Module -> IO a)
                             -- -> IO a
    , withModule_            -- :: Maybe String
                             -- -> String
                             -- -> [ModuleFlags]
                             -- -> (Module -> IO a)
                             -- -> IO ()
    )
where



import System.Posix.DynamicLinker.Module hiding (moduleOpen)
import System.Posix.DynamicLinker.Prim
import System.Posix.DynamicLinker.Common

import Foreign
import System.Posix.ByteString.FilePath

-- Opens a module (EXPORTED)
--

moduleOpen :: RawFilePath -> [RTLDFlags] -> IO Module
moduleOpen :: RawFilePath -> [RTLDFlags] -> IO Module
moduleOpen RawFilePath
file [RTLDFlags]
flags = do
  modPtr <- RawFilePath -> (CString -> IO (Ptr ())) -> IO (Ptr ())
forall a. RawFilePath -> (CString -> IO a) -> IO a
withFilePath RawFilePath
file ((CString -> IO (Ptr ())) -> IO (Ptr ()))
-> (CString -> IO (Ptr ())) -> IO (Ptr ())
forall a b. (a -> b) -> a -> b
$ \ CString
modAddr -> CString -> CInt -> IO (Ptr ())
c_dlopen CString
modAddr ([RTLDFlags] -> CInt
packRTLDFlags [RTLDFlags]
flags)
  if (modPtr == nullPtr)
      then moduleError >>= \ String
err -> IOError -> IO Module
forall a. HasCallStack => IOError -> IO a
ioError (String -> IOError
userError (String
"dlopen: " String -> String -> String
forall a. [a] -> [a] -> [a]
++ String
err))
      else return $ Module modPtr