socket: communicating with Mac OS X KEXT controls

[goderbauer]

BPO	13777
Nosy	@loewis, @ronaldoussoren, @ned-deily
PRs	[3.6] bpo-31878: Fix _socket module compilation on Cygwin. (GH-4137) #4145
Files	kext.patch: Patch to support KEXT Controls patch2.patch

^{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 2012-02-03.16:46:12.600>
created_at = <Date 2012-01-12.18:16:31.798>
labels = ['extension-modules', 'type-feature']
title = 'socket: communicating with Mac OS X KEXT controls'
updated_at = <Date 2017-11-06.13:06:34.286>
user = 'https://bugs.python.org/goderbauer'

bugs.python.org fields:

activity = <Date 2017-11-06.13:06:34.286>
actor = 'python-dev'
assignee = 'none'
closed = True
closed_date = <Date 2012-02-03.16:46:12.600>
closer = 'loewis'
components = ['Extension Modules']
creation = <Date 2012-01-12.18:16:31.798>
creator = 'goderbauer'
dependencies = []
files = ['24220', '24410']
hgrepos = []
issue_num = 13777
keywords = ['patch']
message_count = 6.0
messages = ['151145', '152526', '152529', '152538', '152539', '152540']
nosy_count = 5.0
nosy_names = ['loewis', 'ronaldoussoren', 'ned.deily', 'python-dev', 'goderbauer']
pr_nums = ['4145']
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue13777'
versions = ['Python 3.3']

[goderbauer]

Mac OS X provides a socket-based API to communicate with Kernel Extensions (KEXTs) called "KEXT Controls". For this, Mac OS X defines PF_SYSTEM as a new socket domain which supports the SYSPROTO_CONTROL protocol.

Right now the PF_SYSTEM domain and the SYSPROTO_CONTROL protocol are not supported by Python's socket module. I am attaching a patch that introduces support for both.

More information on KEXT Controls can be found here:
http://developer.apple.com/library/mac/documentation/Darwin/Conceptual/NKEConceptual/control/control.html

[loewis]

The patch fails to apply in configure.in. Can you please regenerate it?

[loewis]

Also: Can you propose test cases for this socket family?

[goderbauer]

Here is the regenerated patch.

To write a test case I would need a PF_SYSTEM socket to connect to. As far as I know Mac OS X doesn't provide a demo socket for this.

[python-dev]

New changeset aa3680d2c24d by Martin v. Löwis in branch 'default':
Issue bpo-13777: Add PF_SYSTEM sockets on OS X.
http://hg.python.org/cpython/rev/aa3680d2c24d

[loewis]

Thanks for the patch. Committed with an additional fix in refcounting.