[Haskell-cafe] How to waitForProcess?

[Mike Ledger]

You might have to use hGetContents, then waitForProcess, and then
terminateProcess -- you can then check if the process is indeed terminated
using getProcessExitCode.

On Wed, Sep 5, 2012 at 1:45 PM, Magicloud Magiclouds <
magicloud.magiclouds at gmail.com> wrote:

> Hi,
>   I have code like this and it leaves lots of zombies of flow-export.
> Then I add waitForProcess.... Well I do not know where to put it.
> Before or after 'hGetContents' both make the program hung.
>
> exportCSV :: FilePath -> IO [String]
> exportCSV file = do
>   csv_ <- withBinaryFile file ReadMode $ \i -> do
>     (_, Just o, _, h) <- createProcess $ CreateProcess (RawCommand
> "/usr/bin/flow-export" ["-f2"]) Nothing Nothing (UseHandle i)
> CreatePipe Inherit True False
>     hGetContents o
>   return $ tail $ lines csv_
>
> --
> 竹密岂妨流水过
> 山高哪阻野云飞
>
> And for G+, please use magiclouds#gmail.com.
>
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