The Python test suite has multiple tests on AF_UNIX sockets. They create a temporary socket path. Example with test_socketserver:

return tempfile.mktemp(prefix='unix_socket.')

The problem is that if the temporary directory is too long, creating a socket with this path fails with "OSError: AF_UNIX path too long". On Linux, sun_path is 107 bytes.

With my PR#93817, TMPDIR becomes something like(...)/test_python_157983_æ/test_python_worker_243024_æ_tmpdir/. For example, the path/home/vstinner/python/main/build/test_python_157983_æ/test_python_worker_243024_æ_tmpdir/unix_socket.xxxxxxxx is 11 bytes long, longer than the limit of 107 bytes.

I see different options:

• Use a relative path
• Create a temporary socket path in the current directory rather than in TMPDIR
• Skip tests if AF_UNIX path is too long