>> I don't know if it's considered to be too expensive to do it for
>> each resolver call (but I gess we could as well reread the
>> resolv.conf file then :)
> It would be too expensive for each call I think - but also
> unnecessary.  Once every N seconds would be plenty.

Except that that means determining when N seconds have passed.

That means either a syscall to get the time or some kind of input-based
time notification like AF_TIMER sockets - though even then it takes
some care to avoid an extra syscall overhead in the common case.
(Incidentally, as a coder, I purely love AF_TIMER and can barely
understand how I lived without it.)

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