[issue9862] test_subprocess hangs on AIX

[Sébastien Sablé]

Sébastien Sablé <sable at users.sourceforge.net> added the comment:

The problem does not happen with Python 2.6.
The difference is that:

* in Python 2.6,  the subprocess module would try to write at most 512 bytes
cf L1221 in subprocess.py
chunk = input[input_offset : input_offset + 512]

* in Python 2.7 and py3k, the subprocess module will try to write at most _PIPE_BUF bytes
cf L1319 in subprocess.py
chunk = input[input_offset : input_offset + _PIPE_BUF]

When forcing PIPE_BUF to 512 in selectmodule.c, the test will pass.
PIPE_BUF seems to be broken on AIX.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9862>
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