Some new system calls

Some new system calls

I remember openat() being relevant to the mechanism of handling file attributes as files. IIRC, the dfd could be a file, and you'd be interacting with the attribute pseudo-filesystem for that file. And you could open a directory as a file, then use openat() and get the attributes of the directory instead of the regular contents of the directory. Or, at least, there was something similar on Solaris for dealing with this sort of thing.