ares_cancel - Cancel a resolve
void ares_cancel(ares_channel channel)
The ares_cancel(3) function cancels all lookups/requests made on the the
name service channel identified by channel. ares_cancel(3)
invokes the callbacks for each pending query on the channel, passing a status
of ARES_ECANCELLED. These calls give the callbacks a chance to clean up
any state which might have been stored in their arguments. If such a callback
invocation adds a new request to the channel, that request will not be
cancelled by the current invocation of ares_cancel(3).
This function was added in c-ares 1.2.0
c-ares 1.6.0 and earlier pass a status of ARES_ETIMEOUT
instead of ARES_ECANCELLED.