what OS and other things?
what does ghc --info say?
Also, when calling haskell code as if it were C code, you need to init the
RTS its using, its not going to magically know you're linking to it from
haskell.(though maybe you can arrange things to use the pre inited hs
runtime, but i'm not familiar with how to do so)
http://www.haskell.org/haskellwiki/Calling_Haskell_from_C
On Mon, Sep 8, 2014 at 10:05 AM, Tobias Neumann
Hello Cafe,
I am trying to use a Haskell shared library with foreign exports from Haskell again via dlopen/dlsym. Sadly it segfaults, and the segfaults happen on dlclose during garbage collection points (as figured out by monochrom in #haskell). So right now I can only open a library once and may not dlclose it. Can someone point me to a mistake I made, or is this rather a ghc (7.8.3) bug? Please see attached minimal example.
Regards, Tobias
test.hs: module Main where
import qualified System.Posix.DynamicLinker as DL import Foreign
foreign import ccall "dynamic" mkTest :: FunPtr Int -> Int
main = do DL.withDL ("./libtest.so") [DL.RTLD_NOW] $ \dl -> do dimPtr <- DL.dlsym dl "test" let test = mkTest dimPtr print test
libtest.hs: module Test() where
import Foreign
foreign export ccall test :: Int
test :: Int test = 124
build with: ghc --make -shared -dynamic -fPIC libtest.hs -o libtest.so ghc --make -dynamic test.hs
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