[Haskell-cafe] How to Hijack stdin,err,out, thread safely?

[Jonas Scholl]

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https://hackage.haskell.org/package/silently may be of interest to you.
Although I do not now whether it is threadsafe.

On 06/30/2015 08:27 PM, Hiromi ISHII wrote:
> Hi, > > I'm currently writing a web app to check the spec of input code >
usging QuickCheck. > quickCheck* functions writes results to stderr &
stdout, but I > don't want them written to the app's original
stdout/err. > (I'm using SafeHaskell features to avoid malicious code
executed, > so don't worry about that :-)) > > So I want to execute I/O
action hijacking stdout/err in a thread-safe manner. > For example, I
need function like below: > > censorHandles :: IO a -> IO (a, String,
String) > censorHandles = ... > > or > > withStd :: Handle -> Handle ->
Handle -> IO a -> IO a > withStd = ... > > -- Hiromi ISHII >
konn.jinro at gmail.com > > > > > >
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