Re: [Haskell-cafe] program execution and laziness

14 Sep 2006


      On Wed, 13 Sep 2006, Tim Newsham wrote:
...
I'm having a problem with program execution in win32 which seems
to be tied to laziness.  The function I'm using is:
runCmd cmd outdir dir base ext = do
    let argv = words cmd
    (i,o,e,p) <- runInteractiveProcess (head argv) (drop 1 argv) Nothing
Nothing
    hClose i
    out <- hGetContents o
    -- print out
    x <- waitForProcess p
    hClose o
    hClose e
    case x of
        ExitSuccess      -> return 0
        (ExitFailure n)  -> return n
Btw. you may want to enclose starting the process and closing the file
handles in a 'bracket'.

Re: [Haskell-cafe] program execution and laziness

Henning Thielemann