posix_spawn_file_actions_addfchdir_np
-------------------------------------

Future POSIX specification:
 https://www.austingroupbugs.net/view.php?id=1208

Gnulib module: ---

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

  * This function is missing on many platforms: glibc 2.28, macOS 10.13, FreeBSD 13.0, NetBSD 9.0, OpenBSD 6.7, Minix 3.1.8, AIX 7.1, HP-UX 11.31, IRIX 6.5, Solaris 11.4, Cygwin 3.4.6, mingw, MSVC 14, Android API level 33.

Note: Gnulib has a module posix_spawn_file_actions_addfchdir that provides equivalent functionality, just without the suffix _np.