Bug report
Bug description:
import os print(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 without HAVE_MAXLOGNAME but with HAVE_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 is sys/param.h, not sys/params.h. As a result, HAVE_UT_NAMESIZE is satisfied (via utmp.h) but HAVE_MAXLOGNAME is not.
This was originally reported to Homebrew via Homebrew/homebrew-core#226857.
CPython versions tested on:
3.15
Operating systems tested on:
macOS