>[mkdir/mknod not; i remember now it was that mkdir had to be setuid
> because the _rename_ call hadn't been implemented yet, that was it!
> so mkdir was, more or less (modulo GC and error checking)
>
>	char *cp;
> 	mkdir(path);
>	link(path, cp = strspl(path, "/."));
>	link(getcwd(), cp = strspl(path, "/.."));

i'm sure someone will correct if i'm wrong, but wasn't it more like

 	system("mkdir path"); /* with some sprintf() magic */
	chown(getuid(), path);
	chgrp(getgid(), path);

because mkdir (the program) actually did

	char *cp;
	mknod(path, 0777, however_you_describe_a_directory);
	link(path, cp = strspl(path, "/."));
	link(getcwd(), cp = strspl(path, "/.."));

since mknod was used to make directories and was limited to use by
root processes?

ps - what's strspl()?

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