gh-98388: add tests for happy eyeballs

[kumaraditya303]

This adds tests from #98389 with merge conflicts fixed and applied suggestions. I have not added staggered tests as new staggered tests already exists.

Closes #98388

Co-Authored-By: twisteroid ambassador twisteroidambassador@users.noreply.github.com

• Issue: Tests for happy eyeballs + working around bug in wait_for #98388

[LamentXU123]

In the PEP 8, style guide, we limit all lines to a maximum of 79 characters.

(EDIT: Removed loud and redundant screenshot image.)

[gvanrossum]

In the PEP 8, style guide, we limit all lines to a maximum of 79 characters.

Let's not do that here. The style guide is voluntary, not mandatory, and in particular the suggested line length limit is often ignored in favor of clarity and/or consistency.

[gvanrossum]

LGTM. Let's ignore the suggestion of breaking long-ish lines.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot s390x RHEL9 Refleaks 3.x (tier-3) has failed when building commit 0240ef4.

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/#/builders/1589/builds/1783) and take a look at the build logs.
4. Check if the failure is related to this commit (0240ef4) 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/#/builders/1589/builds/1783

Failed tests:

• test.test_multiprocessing_fork.test_processes

Failed subtests:

• test_interrupt - test.test_multiprocessing_fork.test_processes.WithProcessesTestProcess.test_interrupt

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

==

Click to see traceback logs

Traceback (most recent call last): File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/test/_test_multiprocessing.py", line 588, in test_interrupt exitcode = self._kill_process(multiprocessing.Process.interrupt) File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/test/_test_multiprocessing.py", line 570, in _kill_process self.assertEqual(join(), None) ~~~~^^ File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/test/_test_multiprocessing.py", line 250, in __call__ return self.func(*args, **kwds) ~~~~~~~~~^^^^^^^^^^^^^^^ File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/process.py", line 156, in join res = self._popen.wait(timeout) File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/popen_fork.py", line 44, in wait return self.poll(os.WNOHANG if timeout == 0.0 else 0) ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/popen_fork.py", line 28, in poll pid, sts = os.waitpid(self.pid, flag) ~~~~~~~~~~^^^^^^^^^^^^^^^^ File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/test/_test_multiprocessing.py", line 566, in handler raise RuntimeError('join took too long: %s' % p) RuntimeError: join took too long: <Process name='Process-2093' pid=3371522 parent=3353961 started daemon> Traceback (most recent call last): File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/process.py", line 320, in _bootstrap self.run() ~~~~~~~~^^ File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/process.py", line 108, in run self._target(*self._args, **self._kwargs) ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/test/_test_multiprocessing.py", line 517, in _sleep_some_event event.set() ~~~~~~~~~^^ File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/synchronize.py", line 344, in set with self._cond: ^^^^^^^^^^ File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/synchronize.py", line 242, in __exit__ return self._lock.__exit__(*args) ~~~~~~~~~~~~~~~~~~~^^^^^^^ File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/synchronize.py", line 100, in __exit__ return self._semlock.__exit__(*args) ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^ KeyboardInterrupt k Traceback (most recent call last): File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/process.py", line 320, in _bootstrap self.run() ~~~~~~~~^^ File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/process.py", line 108, in run self._target(*self._args, **self._kwargs) ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/test/_test_multiprocessing.py", line 518, in _sleep_some_event time.sleep(100) ~~~~~~~~~~^^^^^ KeyboardInterrupt k Traceback (most recent call last): File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/test/_test_multiprocessing.py", line 588, in test_interrupt exitcode = self._kill_process(multiprocessing.Process.interrupt) File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/test/_test_multiprocessing.py", line 570, in _kill_process self.assertEqual(join(), None) ~~~~^^ File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/test/_test_multiprocessing.py", line 250, in __call__ return self.func(*args, **kwds) ~~~~~~~~~^^^^^^^^^^^^^^^ File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/process.py", line 156, in join res = self._popen.wait(timeout) File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/popen_fork.py", line 44, in wait return self.poll(os.WNOHANG if timeout == 0.0 else 0) ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/popen_fork.py", line 28, in poll pid, sts = os.waitpid(self.pid, flag) ~~~~~~~~~~^^^^^^^^^^^^^^^^ File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/test/_test_multiprocessing.py", line 566, in handler raise RuntimeError('join took too long: %s' % p) RuntimeError: join took too long: <Process name='Process-3' pid=3390844 parent=3390838 started daemon>