Re: [Haskell-cafe] runInteractiveCommand: program ends before writing or reading all the output

It looks like a simple race condition to me. You are using "waitForProcess pid" to wait for runInteractiveCommand to finish, but you don't seem to have anything that waits for createDefFile to finish.

main :: IO () main = do (file:_) <- getArgs (_, out, _, pid) <- runInteractiveCommand $ "dumpbin /EXPORTS " ++ file forkIO (createDefFile file out) waitForProcess pid hClose out hFlush stdout