CentOS 7.0 - man page for ares_cancel (centos section 3)
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ares_cancel - Cancel a resolve
void ares_cancel(ares_channel channel)
The ares_cancel function cancels all lookups/requests made on the the name service channel
identified by channel. ares_cancel 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.
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.
31 March 2004 ARES_CANCEL(3)
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