Yann Dirson <y...@blade-group.com> added the comment:
Relevant commits include this one from v3.1.4:
commit 877766dee8e60c7971ed0cabba89fbe981c2ab1b
Author: Antoine Pitrou <solip...@pitrou.net>
Date: Sat Mar 19 17:00:37 2011 +0100
Issue #11459: A `bufsize` value of 0 in subprocess.Popen() really creates
unbuffered pipes, such that select() works properly on them.
I can't use that commit without cherry-picking this one from v3.2.2, though:
commit e96ec6810184f5daacb2d47ab8801365c99bb206
Author: Antoine Pitrou <solip...@pitrou.net>
Date: Sat Jul 23 21:46:35 2011 +0200
Issue #12591: Allow io.TextIOWrapper to work with raw IO objects (without
a read1() method), and add an undocumented *write_through* parameter to
mandate unbuffered writes.
And my test script still shows the same behaviour, with poll.poll() or
poll.select().
The fact that my stdout object has no read1() and needs the above patch looks
like a good lead for further investigation?
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