ares_destroy man page
ares_destroy — Destroy a resolver channel
#include <ares.h> void ares_destroy(ares_channel channel)
The ares_destroy(3) function destroys the name service channel identified by channel, freeing all memory and closing all sockets used by the channel.
ares_destroy(3) invokes the callbacks for each pending query on the channel, passing a status of ARES_EDESTRUCTION. These calls give the callbacks a chance to clean up any state which might have been stored in their arguments. A callback must not add new requests to a channel being destroyed.
Greg Hudson, MIT Information Systems
Copyright 1998 by the Massachusetts Institute of Technology.
ares_cancel(3), ares_dup(3), ares_gethostbyaddr(3), ares_gethostbyname(3), ares_getnameinfo(3), ares_init(3), ares_init_options(3), ares_query(3), ares_search(3), ares_send(3).