[PATCH] io: statx, fstatat64: allow using NULL as path

[Paul Eggert]

On 2026-06-16 12:20, Sam James wrote:
> But say, fchmodat is still wrong in io/sys/stat.h.

Yes, and faccessat and fchownat are still wrong in posix/unistd.h, and 
openat2 is wrong in sysdeps/unix/sysv/linux/bits/fcntl-linux.h. All 
those declarations mistakenly tell GCC that the filename arg must not be 
null, and this bug can cause GCC to generate wrong code.

Please go ahead and submit fixes on the glibc side. I will look into 
fixing this on the Gnulib side, by supplying wrappers for the broken 
functions.