[New-bugs-announce] [issue26848] asyncio.subprocess's communicate() method mishandles empty input bytes

[Jack O'Connor]

New submission from Jack O'Connor:

Setting stdin=PIPE and then calling communicate(b"") should close the child's stdin immediately, similar to stdin=DEVNULL. Instead, communicate() treats b"" like None and leaves the child's stdin open, which makes the child hang forever if it tries to read anything.

I have a PR open with a fix and a test: https://github.com/python/cpython/pull/33

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components: asyncio
messages: 264212
nosy: gvanrossum, haypo, oconnor663, yselivanov
priority: normal
severity: normal
status: open
title: asyncio.subprocess's communicate() method mishandles empty input bytes
type: behavior
versions: Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26848>
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