I don't think it's the same thing. Linkat is still starting with a file that exists in the filesystem. In my silly world, unopen() would just take any fd (sock

I don't think it's the same thing. Linkat is still starting with a file that exists in the filesystem. In my silly world, unopen() would just take any fd (socket, file, pipe, etc.) and create a file system binding which anyone could open. Kind of like how /proc works on Linux today.