[Patch] posixmodule: Make the presence of os.getpid() optional

[EdSchouten]

BPO	28156
Nosy	@berkerpeksag, @EdSchouten
Files	patch-no-getpid: Patch to provide os.getpid() conditionally

^{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 2016-09-15.17:47:11.187>
created_at = <Date 2016-09-14.16:53:50.884>
labels = ['extension-modules', '3.7']
title = '[Patch] posixmodule: Make the presence of os.getpid() optional'
updated_at = <Date 2016-09-15.17:47:11.184>
user = 'https://github.com/EdSchouten'

bugs.python.org fields:

activity = <Date 2016-09-15.17:47:11.184>
actor = 'berker.peksag'
assignee = 'none'
closed = True
closed_date = <Date 2016-09-15.17:47:11.187>
closer = 'berker.peksag'
components = ['Extension Modules']
creation = <Date 2016-09-14.16:53:50.884>
creator = 'EdSchouten'
dependencies = []
files = ['44664']
hgrepos = []
issue_num = 28156
keywords = []
message_count = 3.0
messages = ['276470', '276579', '276580']
nosy_count = 3.0
nosy_names = ['python-dev', 'berker.peksag', 'EdSchouten']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue28156'
versions = ['Python 3.6', 'Python 3.7']

[EdSchouten]

CloudABI (https://mail.python.org/pipermail/python-dev/2016-July/145708.html) does not provide getpid(). Though this may sound quite silly at first, there is quite a good reason for this. One of the things that CloudABI wants to achieve is making large scale (cluster/cloud) computing easier. In such an environment there is rarely a need for having machine-local unique process identifiers. They have to be globally unique and preferably not recycled.

POSIX requires that pid_t is a signed integer that must have a positive value. Most C compilers only provide full support for integers up to 64 bits in size. This means that CloudABI could only provide 63-bit process identifiers, which is far smaller than, say, a UUID. For this reason we've decided to omit getpid() altogether.

Attached is a patch that makes use of the already existing HAVE_GETPID definition in pyconfig.h to disable the os.getpid() function that is part of the posixmodule.

[python-dev]

New changeset d17ff867580f by Berker Peksag in branch '3.6':
Issue bpo-28156: Export os.getpid() conditionally
https://hg.python.org/cpython/rev/d17ff867580f

New changeset 33834105048e by Berker Peksag in branch 'default':
Issue bpo-28156: Merge from 3.6
https://hg.python.org/cpython/rev/33834105048e

[berkerpeksag]

Thanks!