Re: [Haskell-cafe] How to waitForProcess?

Forgot about that, just read 'readProcess' code to figure out. Thanks. On Wed, Sep 5, 2012 at 12:37 PM, Ivan Lazar Miljenovic wrote:

On 5 September 2012 13:45, Magicloud Magiclouds 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.

You're probably being bitten by hGetContents being lazy. Force the result of hGetContents (e.g. `evaluate . length =<< hGetContents o ') and then use waitForProcess.

...

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_

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-- 竹密岂妨流水过 山高哪阻野云飞 And for G+, please use magiclouds#gmail.com.