[Python-ideas] Tulip / PEP 3156 - subprocess events

Mon Jan 21 00:40:34 CET 2013

On 20 January 2013 23:29, Eli Bendersky <eliben at gmail.com> wrote:
> subprocess.Popen has the pass_fds argument, documented as follows:
>> pass_fds is an optional sequence of file descriptors to keep open
> between the parent and child. Providing any pass_fds forces close_fds to be
> True. (Unix only)

I thought that was the case, but it seems like this is only really
enabling you to manually manage the extra pipes as I was suggesting in
my comment.
My current expectation is that the API would be something like
eventloop.connect_process(protocol_factory, popen_obj) and the
protocol would have data_received and err_received methods called when
the stdout or stderr fds have data, and the transport would have a
write method to write to stdin.
If anyone has a suggestion for an API that could be used for arbitrary
FDs (which I presume could be either input or output) on top of this,
I'd be happy to incorporate it - but personally, I can't think of
anything that wouldn't be unusably complex :-(
Paul