Message9138

This is not currently possible. For details, please see
https://github.com/jythontools/jython/blob/master/Lib/subprocess.py#L865:

                    # Coupling stdin is not supported: there's no way to
                    # cleanly interrupt it if it blocks the
                    # _CouplerThread forever (we can Thread.interrupt()
                    # its _CouplerThread but that closes stdin's
                    # Channel)
                    pass

which means we don't have the ability to put a coupling thread to ensure simulating selectable, plus the underlying channel is buffered. Now there are other possibilities as seen in JRuby, with details given here: http://blog.headius.com/2013/06/the-pain-of-broken-subprocess.html

But as we see in the final analysis by Charlie Nutter, one hits a wall here.

For now, likely the best approach is to let CPython control the subprocess, then control the CPython with some other tooling like rpyc.

Perhaps Java 9 will offer some improvements, although it looks like http://openjdk.java.net/jeps/102 will be more limited. Let's revisit at that time.