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10.417 getlogin

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

Gnulib module: getlogin

Portability problems fixed by Gnulib:

• This function is missing on some platforms: older mingw, MSVC 14.
• This function is not declared unless _POSIX is defined on some platforms: mingw.

Portability problems not fixed by Gnulib:

• This function returns an empty string even when standard input is a tty on some platforms: HP-UX 11.11.