* In particular, don't exit when trying to print to stderr = None.
* Add tests

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

…linic (#94519)

Convert fork_exec to pre-inlined-argparser Argument Clinic

Co-authored-by: Gregory P. Smith <greg@krypto.org>

…H-103561)

Fix shifted field initialization in instrumentation.c

…102424)

Co-authored-by: Simeon Visser <svisser@users.noreply.github.com>

…s in 3.12 (GH-101728)

…Windows (GH-101286)

…nt_stack` (#101652)

Created from a patch file attached to an issue, by Anatoly Techtonik.

* Rename `group*` to `extra_group*` to avoid confusion
* Rename `num_groups` into `extra_group_size`
* Rename `groups_list` to `extra_groups_packed`

…H-101042)

…erved values (#94687)

Have _posixsubprocess.c stop using boolean flags to say if gid and uid values were supplied and action is required.  Such an implicit "either initialized or look somewhere else" confused both the reader (another mental connection to constantly track between functions) and a compiler (warnings on potentially uninitialized variables being passed). Instead, we can utilize a special group/user id as a flag value -1 defined by POSIX but used nowhere else. Namely:

gid: call_setgid = False → gid = -1

uid: call_setuid = False → uid = -1

groups: call_setgroups = False → groups = NULL (obtained with (groups_list != Py_None) ? groups : NULL)

This PR is required for #94519.

…_streams: port server cases to IsolatedAsyncioTestCase" (#98015)

This PR reverts gh-93369 and gh-97896 because they've made asyncio tests unstable. After these PRs were merged, random GitHub action jobs of random commits started to fail unrelated tests and test framework methods.

The reverting is necessary because such shrapnel failures are a symptom of some underlying bug that must be found and fixed first.

I had a hope that it's a server overload because we already have extremely rare disc access errors. However, one and a half day passed, and the failures continue to emerge both in PRs and commits.

Affected issue: gh-93357.
First reported in #97940 (comment).

* Revert "gh-93357: Port test cases to IsolatedAsyncioTestCase, part 2 (#97896)"

This reverts commit 09aea94.

* Revert "gh-93357: Start porting asyncio server test cases to IsolatedAsyncioTestCase (#93369)"

This reverts commit ce8fc18.

This fixes the buildbots.

…estCase (#93369)

Lay the foundation for further work in `asyncio.test_streams`.

gh-93243

This PR is required to reduce diffs of the following porting (no need to either maintain documentation and tests consistent with each porting step, or try to port everything and remove smtpd in a single PR).

Automerge-Triggered-By: GH:warsaw

…rom void *" (GH-95538)

This PR couples with python/pyperformance#222 and supersedes #92560. Inspired by #93096 (comment).

Automerge-Triggered-By: GH:ericsnowcurrently

…92891)

Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>

Co-authored-by: Barney Gale <barney.gale@gmail.com>

…4517)