Bug report

Bug description:

importosprint(os.getlogin())

$python3 -c"import os; print(os.getlogin())"Traceback (most recent call last):  File "<string>", line 1, in <module>    import os; print(os.getlogin())                     ~~~~~~~~~~~^^OSError: [Errno -34] Unknown error: -34

It appears that if Python is compiled in an environment withoutHAVE_MAXLOGNAME but withHAVE_UT_NAMESIZE,getlogin_r will return error 34 if username is >9 characters.

This appears to be a regression introduced in#132751:

https://github.com/duaneg/cpython/blob/675342cf59ffe53337d92af989b97dad687a10ea/configure.ac#L5434

The correct header file to search for issys/param.h, notsys/params.h. As a result,HAVE_UT_NAMESIZE is satisfied (viautmp.h) butHAVE_MAXLOGNAME is not.

This was originally reported to Homebrew viaHomebrew/homebrew-core#226857.

CPython versions tested on:

3.15

Operating systems tested on:

macOS

Linked PRs

• gh-135497: fix MAXLOGNAME detection in configure #135508
• [3.14] gh-135497: fixMAXLOGNAME detection inconfigure.ac (GH-135508) #135516
• [3.13] gh-135497: fixMAXLOGNAME detection inconfigure.ac (GH-135508) #135517