[3.9] gh-119461: Fix ThreadedVSOCKSocketStreamTest (GH-129171) (GH-129440) by miss-islington · Pull Request #130075 · python/cpython

…29171) (pythonGH-129440)

* [3.11] pythongh-119461: Fix ThreadedVSOCKSocketStreamTest (pythonGH-129171)

Fix ThreadedVSOCKSocketStreamTest: if get_cid() returns the host
address or the "any" address, use the local communication address
(loopback): VMADDR_CID_LOCAL.

On Linux 6.9, apparently, the /dev/vsock device is now available but
get_cid() returns VMADDR_CID_ANY (-1).

(cherry picked from commit 45db419)

Co-authored-by: Victor Stinner <vstinner@python.org>
(cherry picked from commit e94dbe4)
(cherry picked from commit c750061)
(cherry picked from commit cbfe302)

* pythongh-119461: Restore the testSocket VSOCK skipUnless removed by PR pythonGH-119465 (pythonGH-129561)

Restore the skipUnless removed by pythonGH-119465.

This test can only pass on virtual machines, not actual machines.

actual machines see:

```
    self.cli.connect((cid, VSOCKPORT))
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
OSError: [Errno 19] No such device
```

Reproduced on (Linux) Ubuntu 24.04.1 running 6.8.0-52-generic.

---------

(cherry picked from commit 2bd9f9b)

Co-authored-by: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Co-authored-by: Victor Stinner <vstinner@python.org>
Co-authored-by: Gregory P. Smith <greg@krypto.org>