Add os.get_blocking() and os.set_blocking() functions

[vstinner]

BPO	22054
Nosy	@pitrou, @vstinner, @4kir4
Files	os_blocking.patch os_blocking-2.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 2014-07-29.20:39:06.035>
created_at = <Date 2014-07-23.21:30:14.220>
labels = ['type-feature']
title = 'Add os.get_blocking() and os.set_blocking() functions'
updated_at = <Date 2014-07-29.20:39:06.034>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2014-07-29.20:39:06.034>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2014-07-29.20:39:06.035>
closer = 'vstinner'
components = []
creation = <Date 2014-07-23.21:30:14.220>
creator = 'vstinner'
dependencies = []
files = ['36052', '36053']
hgrepos = []
issue_num = 22054
keywords = ['patch']
message_count = 9.0
messages = ['223782', '223784', '224131', '224162', '224165', '224170', '224171', '224184', '224247']
nosy_count = 5.0
nosy_names = ['pitrou', 'vstinner', 'neologix', 'akira', 'python-dev']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue22054'
versions = ['Python 3.5']

[vstinner]

Antoine suggested me to add these functions in the issue bpo-22042.

Here is a patch to implement these functions and use them in various places.

[vstinner]

Oops, test_asyncio was failing. Fixed patched.

[vstinner]

Can someone please review my patch?

[4kir4]

Maybe is_something() is a better name than get_something()
if something is a boolean?

[vstinner]

Maybe is_something() is a better name than get_something()
if something is a boolean?

os and socket modules already use getxxx() / setxxx() names:

• os.get_inheritable() / os.set_inheritable()
• os.getuid() / os.setuid()
• os.getgroups() / os.setgroups()
• os.getxattr() os.setxattr()
• socket.gettimeout() / socket.settimeout()
• socket.get_inheritable() / socket.set_inheritable()
• etc.

There is only one "is" function: os.isatty(), but it does not have a "os.settty" method.

[4kir4]

os and socket modules already use getxxx() / setxxx() names:

• os.get_inheritable() / os.set_inheritable()
• os.getuid() / os.setuid()
• os.getgroups() / os.setgroups()
• os.getxattr() os.setxattr()
• socket.gettimeout() / socket.settimeout()
• socket.get_inheritable() / socket.set_inheritable()
• etc.

egid, euid, gid, groups, pgid, pgrp, priority, resgid, sid, uid, xatrr,
hostname, timeout, sockopt are not boolean. Though
get_inheritable() spoils the pot.

Compare:

  if os.get_blocking(fd): # is it a bug? Does it return some mode bits?
     # Do I need stat.IS_BLK(os.get_blocking(fd)) here instead?

And:

  if os.is_blocking(fd):
     # it is clear that fd is blocking

There could be an argument that get_inheritable should be renamed to
is_inheritable instead.

[neologix]

I agree with Akira, although it's probably too late now to rename.

[vstinner]

Guido van Rossum told me that he's ok for "get": "I'd go with get, since that seems the tradition in the os module."

[python-dev]

New changeset 8f0b8ddbb66b by Victor Stinner in branch 'default':
Issue bpo-22054: Add os.get_blocking() and os.set_blocking() functions to get and
http://hg.python.org/cpython/rev/8f0b8ddbb66b

[jiafangtao]

Hi Experts, I notice that on Windows os.get_blocking and os.set_blocking are missing. When looking at the source of os.py in cpython source code, I am wondering that may be caused by there two are not added into nt module. My question is how I can use them on Windows, or is it possible? Thanks in advance.

I'm not a guru of Python. Please forgive me if the questions don't make sense.