[Haskell-cafe] No handles from createProcess
allbery.b at gmail.com
Mon Dec 15 16:23:49 UTC 2014
On Mon, Dec 15, 2014 at 9:11 AM, Henk-Jan van Tuyl <hjgtuyl at chello.nl>
> I am experimenting with the createProcess function from the package
> "process"; this function does not return any handle, on both Ubuntu and
> Windows. I am doing something wrong, or is this a bug? (I am using GHC
> 7.8.3 on both platforms.)
Not a bug; you need to tell it which ones to create handles for.
> returns (mb_stdin_hdl, mb_stdout_hdl, mb_stderr_hdl, p), where
> - if std_in == CreatePipe, then mb_stdin_hdl will be Just h, where h is
> the write end of the pipe connected to the child process's stdin.
> - otherwise, mb_stdin_hdl == Nothing
> Similarly for mb_stdout_hdl and mb_stderr_hdl.
The default action is to inherit the existing handles for stdin/out/err in
the subprocess and provide no handles to the caller; this mirrors the
default behavior of creating a new process on Windows and POSIX.
brandon s allbery kf8nh sine nomine associates
allbery.b at gmail.com ballbery at sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net
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