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10.388 getlogin_r

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/getlogin_r.html

Gnulib module: getlogin_r

Portability problems fixed by Gnulib:

• This function is missing on some platforms: NetBSD 3.0, Minix 3.1.8, mingw, MSVC 14, Android 8.1.
• This function is not declared unless _REENTRANT is defined, on some platforms: HP-UX 11.
• This function returns a truncated result, instead of failing with error code ERANGE, when the buffer is not large enough, on some platforms: macOS 11.1.

Portability problems not fixed by Gnulib:

• This function has an incompatible declaration on some platforms: FreeBSD 12.0, MidnightBSD 2.0, Solaris 11.4 (when _POSIX_PTHREAD_SEMANTICS is not defined).
• This function fails even when standard input is a tty on some platforms: HP-UX 11.11.
• This function fails with error code EINVAL instead of ERANGE when the second argument is zero on some platforms: HP-UX 11.31.
• This function fails with error code ENOMEM instead of ERANGE on some platforms: Haiku.