warnings with subprocess and pipe2

[pitrou]

BPO	11006
Nosy	@birkenfeld, @gpshead, @pitrou

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2011-12-22.07:45:19.536>
created_at = <Date 2011-01-25.14:30:08.932>
labels = ['type-bug', 'library']
title = 'warnings with subprocess and pipe2'
updated_at = <Date 2011-12-22.07:45:19.534>
user = 'https://github.com/pitrou'

bugs.python.org fields:

activity = <Date 2011-12-22.07:45:19.534>
actor = 'rosslagerwall'
assignee = 'rosslagerwall'
closed = True
closed_date = <Date 2011-12-22.07:45:19.536>
closer = 'rosslagerwall'
components = ['Library (Lib)']
creation = <Date 2011-01-25.14:30:08.932>
creator = 'pitrou'
dependencies = []
files = []
hgrepos = []
issue_num = 11006
keywords = []
message_count = 4.0
messages = ['127011', '127012', '150074', '150077']
nosy_count = 5.0
nosy_names = ['georg.brandl', 'gregory.p.smith', 'pitrou', 'rosslagerwall', 'python-dev']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue11006'
versions = ['Python 3.2', 'Python 3.3']

[pitrou]

Since r87651, subprocess can raise a RuntimeWarning if pipe2() fails.
I'm not sure there's any point in that, since it's very low-level and it's nothing the user can do about anyway.

Ironically, there is no warning if pipe2() is not available at all.

[pitrou]

This can be seen on the sparc Debian buildbot by the way:

/home/pybot/buildarea-sid/3.x.klose-debian-sparc/build/Lib/subprocess.py:1085: RuntimeWarning: pipe2 set errno ENOSYS; falling back to non-atomic pipe+fcntl.
c2pread, c2pwrite = _create_pipe()
/home/pybot/buildarea-sid/3.x.klose-debian-sparc/build/Lib/subprocess.py:1144: RuntimeWarning: pipe2 set errno ENOSYS; falling back to non-atomic pipe+fcntl.
errpipe_read, errpipe_write = _create_pipe()
[etc.]

http://www.python.org/dev/buildbot/all/builders/sparc%20Debian%203.x/builds/1/steps/test/logs/stdio

[python-dev]

New changeset dc913f73a7fb by Ross Lagerwall in branch '3.2':
Issue bpo-11006: Don't issue low level warning in subprocess when pipe2() fails.
http://hg.python.org/cpython/rev/dc913f73a7fb

New changeset b1b35583967a by Ross Lagerwall in branch 'default':
Merge with 3.2 for bpo-11006.
http://hg.python.org/cpython/rev/b1b35583967a

[rosslagerwall]

Removed the warnings.

Thanks.