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|
#if __GLASGOW_HASKELL__ >= 709
{-# LANGUAGE Safe #-}
#elif __GLASGOW_HASKELL__ >= 703
{-# LANGUAGE Trustworthy #-}
#endif
-----------------------------------------------------------------------------
-- |
-- Module : System.Posix.DynamicLinker.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)
--
-- Dynamic linker support through dlopen()
-----------------------------------------------------------------------------
module System.Posix.DynamicLinker.ByteString (
module System.Posix.DynamicLinker.Prim,
dlopen,
dlsym,
dlerror,
dlclose,
withDL, withDL_,
undl,
)
-- 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
--
-- withDL "libfoo.so" [RTLD_NOW] \$ \\ mod -> do
-- funptr <- dlsym mod "mogrify"
-- let fun = fun__ funptr
-- withCString "test" \$ \\ str -> do
-- strptr <- fun str 1
-- strstr <- peekCString strptr
-- ...
--
where
import System.Posix.DynamicLinker.Common
import System.Posix.DynamicLinker.Prim
#include "HsUnix.h"
import Control.Exception ( bracket )
import Control.Monad ( liftM )
import Foreign
import System.Posix.ByteString.FilePath
dlopen :: RawFilePath -> [RTLDFlags] -> IO DL
dlopen path flags = do
withFilePath path $ \ p -> do
liftM DLHandle $ throwDLErrorIf "dlopen" (== nullPtr) $ c_dlopen p (packRTLDFlags flags)
withDL :: RawFilePath -> [RTLDFlags] -> (DL -> IO a) -> IO a
withDL file flags f = bracket (dlopen file flags) (dlclose) f
withDL_ :: RawFilePath -> [RTLDFlags] -> (DL -> IO a) -> IO ()
withDL_ file flags f = withDL file flags f >> return ()
|
