Re: Posix library ,Concurrent Haskell and Haskell IO sub-system

On Thu, 10 Jul 2003, Volker Stolz wrote:

In local.glasgow-haskell-users, you wrote:

...

I use the Posix library since I have to communicate via a pipe with another UNIX process.

Therefore I have to use fdRead :: Fd -> ByteCount -> IO (String,ByteCount)

Why do you "have to" use an Fd? A regular handle should be sufficient. Where do you get the Fd from?

createPipe :: IO (Fd,Fd) (Unkown alternatives)

Did you consider lifting the Fd back to a Handle?

How ? Only known intToFd :: Int -> Fd fdToInt :: Fd -> Int

If you really need to read exactly ByteCount bytes, you could go the hard way and set the handle to unbuffered IO and call hGetChar n times.

OK. What about ? threadReadWait :: Int -> IO() Should I convert a Handle into a Int ?