ttyname
=======

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

Gnulib module: ---

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

  * This function is missing on some platforms: mingw, MSVC 14.

  * This function is just a stub that produces an error message on standard error on some platforms: Android 4.3.