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server_set_inetaddr() updater argument is a simple char * string containing infos about the caller responsible for the update. In this patch, we try to make this argument serializable, that is, make it so that we can easily export it without having to keep the original pointer passed by the caller or having to work with strings of variable lengths. This was a prerequisite for exposing more updater information through SERVER_INETADDR event (upcoming patch). Static strings were simply mapped to a fixed ID that can be converted back to a string when needed using server_inetaddr_updater_by_to_str(). One special case one made for the SERVER_INETADDR_UPDATER_DNS_RESOLVER updater since in this case the updater hint has to be generated from the corresponding resolver id / nameserver id combination. This was achieved by saving the nameserver id within the updater struct. Knowing that the resolver id can be guessed from the server struct directly, it was not exposed through the updater struct. This patch depends on: - "MINOR: resolvers: add unique numeric id to nameservers" No functional change should be expected.