bpo-43106: Add os.O_EVTONLY/O_FSYNC/O_SYMLINK/O_NOFOLLOW_ANY

[corona10]

https://bugs.python.org/issue43106

[serhiy-storchaka]

What's New.

[corona10]

@serhiy-storchaka

What's New.

I intended to update What's New when we decide what flags will be added.
What do you think?

O_SYMLINK and O_NOFOLLOW_ANY are not yet added.

[serhiy-storchaka]

I think that all flags should be added. Even if they are not used in the stdlib, they can be used in third-party projects.

[corona10]

I think that all flags should be added. Even if they are not used in the stdlib, they can be used in third-party projects.

Got it then I will add all flags through this PR and update the what's news

[bedevere-bot]

When you're done making the requested changes, leave the comment: I have made the requested changes; please review again.

[corona10]

I have made the requested changes; please review again

[bedevere-bot]

Thanks for making the requested changes!

@ronaldoussoren: please review the changes made to this pull request.

[ronaldoussoren]

LGTM

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot aarch64 RHEL7 3.x has failed when building commit f917c24.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/539/builds/601) and take a look at the build logs.
4. Check if the failure is related to this commit (f917c24) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/539/builds/601

Summary of the results of the build (if available):

== Tests result: ENV CHANGED ==

412 tests OK.

10 slowest tests:

• test_concurrent_futures: 4 min 14 sec
• test_unparse: 3 min 55 sec
• test_capi: 3 min 19 sec
• test_tokenize: 2 min 52 sec
• test_multiprocessing_spawn: 2 min 52 sec
• test_lib2to3: 2 min 21 sec
• test_peg_generator: 2 min 18 sec
• test_asyncio: 2 min 11 sec
• test_gdb: 1 min 28 sec
• test_multiprocessing_forkserver: 1 min 23 sec

1 test altered the execution environment:
test_asyncio

13 tests skipped:
test_devpoll test_ioctl test_kqueue test_msilib test_ossaudiodev
test_startfile test_tix test_tk test_ttk_guionly test_winconsoleio
test_winreg test_winsound test_zipfile64

Total duration: 7 min 40 sec

Click to see traceback logs

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL7-aarch64/build/Lib/asyncio/sslproto.py", line 321, in __del__
    self.close()
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL7-aarch64/build/Lib/asyncio/sslproto.py", line 316, in close
    self._ssl_protocol._start_shutdown()
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL7-aarch64/build/Lib/asyncio/sslproto.py", line 590, in _start_shutdown
    self._abort()
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL7-aarch64/build/Lib/asyncio/sslproto.py", line 731, in _abort
    self._transport.abort()
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL7-aarch64/build/Lib/asyncio/selector_events.py", line 680, in abort
    self._force_close(None)
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL7-aarch64/build/Lib/asyncio/selector_events.py", line 731, in _force_close
    self._loop.call_soon(self._call_connection_lost, exc)
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL7-aarch64/build/Lib/asyncio/base_events.py", line 745, in call_soon
    self._check_closed()
  File "/home/buildbot/buildarea/3.x.cstratak-RHEL7-aarch64/build/Lib/asyncio/base_events.py", line 510, in _check_closed
    raise RuntimeError('Event loop is closed')
RuntimeError: Event loop is closed