2012/10/20 Asten, W.G.G. van (Wilfried, Student M-CSC)
Would you be happy with a solution like this:
- First create two handles to two files in the tmp directory - Then use StdStream's UseHandle to redirect std_err and std_out (using CreatePipe for std_in) to these files - Then write your query to the Handle for std_in - waitForProcess - Collect std_out and std_err from the temporary files.
If that is not satisfactory you may want to check out conduit-process (http://hackage.haskell.org/packages/archive/process-conduit/0.5.0.2/doc/html...) that also does some interaction with a process and interleaves std_in and std_out. It should not be to hard to combine std_err into that concept. I also faced this same problem and in one case solved it by using a temporary file to hold my content which was also deleted afterwards (This immediately prevented the content building up in memory).
For my application, it's important to be able to run multiple queries against the same Bash session. Waiting for Bash to shut down is thus not a viable way to finalize the response. Perhaps I can spawn two cats with their outputs connected to the FIFOs and wait for them to terminate. -- Jason Dusek pgp // solidsnack // C1EBC57DC55144F35460C8DF1FD4C6C1FED18A2B