80 lines
2.6 KiB
Haskell
80 lines
2.6 KiB
Haskell
#if __GLASGOW_HASKELL__ >= 709
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{-# LANGUAGE Safe #-}
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#else
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{-# LANGUAGE Trustworthy #-}
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#endif
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-----------------------------------------------------------------------------
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-- |
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-- Module : System.Posix.DynamicLinker.Module.ByteString
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-- Copyright : (c) Volker Stolz <vs@foldr.org> 2003
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-- License : BSD-style (see the file libraries/base/LICENSE)
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--
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-- Maintainer : vs@foldr.org
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-- Stability : provisional
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-- Portability : non-portable (requires POSIX)
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--
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-- DLOpen support, old API
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-- Derived from GModule.chs by M.Weber & M.Chakravarty which is part of c2hs
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-- I left the API more or less the same, mostly the flags are different.
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--
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-----------------------------------------------------------------------------
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module System.Posix.DynamicLinker.Module.ByteString (
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-- Usage:
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-- ******
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--
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-- Let's assume you want to open a local shared library 'foo' (./libfoo.so)
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-- offering a function
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-- char * mogrify (char*,int)
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-- and invoke str = mogrify("test",1):
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--
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-- type Fun = CString -> Int -> IO CString
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-- foreign import dynamic unsafe fun__ :: FunPtr Fun -> Fun
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--
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-- withModule (Just ".") ("libfoo.so") [RTLD_NOW] $ \ mod -> do
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-- funptr <- moduleSymbol mod "mogrify"
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-- let fun = fun__ funptr
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-- withCString "test" $ \ str -> do
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-- strptr <- fun str 1
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-- strstr <- peekCString strptr
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-- ...
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Module
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, moduleOpen -- :: String -> ModuleFlags -> IO Module
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, moduleSymbol -- :: Source -> String -> IO (FunPtr a)
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, moduleClose -- :: Module -> IO Bool
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, moduleError -- :: IO String
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, withModule -- :: Maybe String
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-- -> String
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-- -> [ModuleFlags ]
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-- -> (Module -> IO a)
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-- -> IO a
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, withModule_ -- :: Maybe String
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-- -> String
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-- -> [ModuleFlags]
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-- -> (Module -> IO a)
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-- -> IO ()
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)
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where
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#include "HsUnix.h"
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import System.Posix.DynamicLinker.Module hiding (moduleOpen)
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import System.Posix.DynamicLinker.Prim
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import System.Posix.DynamicLinker.Common
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import Foreign
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import System.Posix.ByteString.FilePath
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-- Opens a module (EXPORTED)
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--
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moduleOpen :: RawFilePath -> [RTLDFlags] -> IO Module
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moduleOpen file flags = do
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modPtr <- withFilePath file $ \ modAddr -> c_dlopen modAddr (packRTLDFlags flags)
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if (modPtr == nullPtr)
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then moduleError >>= \ err -> ioError (userError ("dlopen: " ++ err))
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else return $ Module modPtr
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