(not a bug but messy)
o added optimization where we only check as many registered fd's
on the list as select tells us are active in its status
o added code to clear all of the fd_set if select returns an error
(in practice this would not cause a bug other than some extra activity
that would immediately self terminate when it clear the flag in the fd_set,
and also we dont see the error message printed when select returns an error)
72e1dba496