>>The first one was, instead of only declaring CTL_XXX and XXX_VALUE defines
>>and write a function for every single subtree, to declare full structs
>>that reference each other in a way that makes it possible for a single
>>function to handle a whole subtree, with some quirks for some values that
>>need special management.

	BSDI is doing something like this.  you pass table of CTL_xx and
	pointer to variable, and sysctl_int_arr() will handle dispatches.

itojun