Are you adjusting 'System.IO.hSetBuffering' to NoBuffering for those handles? Graham Fawcett wrote:
Hi folks,
I would like to communicate with an external, line-oriented process, which takes a sequence of one-line commands, each returning an arbitrary number of lines, and waits for another command after each response. So, something like:
sendCmd :: (Handle, Handle) -> String -> IO [String] ...
main = do handles <- connectToExternalProcess sendCmd handles "do something" resp <- sendCmd "get results" -- needs strict I/O, before "quit"? sendCmd "quit" mapM_ putStrLn resp
I've tried using runInteractiveCommand, and several combinations of hFlush, hWaitForInput, etc., but I can't find a combination that actually works.
I know this is a sketchy description, but can anyone offer some sample code, or point me toward a program that has similar behaviour?
Thanks, Graham