Some macOS open flags are missing from posixmodule.c

[ronaldoussoren]

BPO	43106
Nosy	@ronaldoussoren, @ned-deily, @corona10
PRs	#24428

^{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 2021-02-04.01:13:54.288>
created_at = <Date 2021-02-02.19:26:29.108>
labels = ['extension-modules', 'OS-mac', 'type-feature', 'easy', '3.10']
title = 'Some macOS open flags are missing from posixmodule.c'
updated_at = <Date 2021-02-04.01:13:54.287>
user = 'https://github.com/ronaldoussoren'

bugs.python.org fields:

activity = <Date 2021-02-04.01:13:54.287>
actor = 'corona10'
assignee = 'none'
closed = True
closed_date = <Date 2021-02-04.01:13:54.288>
closer = 'corona10'
components = ['Extension Modules', 'macOS']
creation = <Date 2021-02-02.19:26:29.108>
creator = 'ronaldoussoren'
dependencies = []
files = []
hgrepos = []
issue_num = 43106
keywords = ['patch', 'easy (C)']
message_count = 5.0
messages = ['386159', '386161', '386179', '386181', '386466']
nosy_count = 3.0
nosy_names = ['ronaldoussoren', 'ned.deily', 'corona10']
pr_nums = ['24428']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue43106'
versions = ['Python 3.10']

[ronaldoussoren]

The following O_* flags are present in the macOS 11 SDK, but aren't provided by posixmodule.c:

O_FSYNC (alias for O_SYNC)
O_EVTONLY
O_SYMLINK
O_NOFOLLOW_ANY

[ronaldoussoren]

Likewise for O_POPUP and O_ALERT, although I don't understand what these are supposed to do.

[corona10]

I can see some users use such flags with manual mapping
Looks good to support it :)

https://github.com/TaskEvolution/Task-Coach-Evolution/blob/master/taskcoach/taskcoachlib/filesystem/fs_darwin.py#L27

[corona10]

O_FSYNC could be used as an alias of O_SYNC.
O_EVTONLY is used for kqueue API.

but other flags I don't know where to use it.
So I submit the patch to add O_FSYNC and O_EVTONLY only.

If other flags should be added, please let me know

[corona10]

New changeset f917c24 by Dong-hee Na in branch 'master':
bpo-43106: Add os.O_EVTONLY/O_FSYNC/O_SYMLINK/O_NOFOLLOW_ANY (GH-24428)
f917c24