# dkim_dns_set_query_service()

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SYNOPSIS |
    #include <dkim.h>
    void dkim_dns_set_query_service(
    	DKIM_LIB *libopendkim,
            void *service
    );
Specifies an opaque handle referring to the DNS service to be used by libopendkim. This handle will be passed to the DNS functions declared using `dkim_dns_set_query_start()`, `dkim_dns_set_query_cancel()`, and `dkim_dns_set_query_waitreply()`.
DESCRIPTION |
Called When | `dkim_dns_set_query_service()` can be called at any time, but is presumably most useful prior to doing any DNS operations such as are done during `dkim_eoh()` when verifying.
ARGUMENTS |
Argument | Description
--- | ---
libopendkim | The library instantiation handle, returned by `dkim_init()`.
service | An opaque handle referring to the DNS service to be used.
RETURN VALUES | None.
NOTES | Asynchronous key lookups can also be accomplished using `dkim_set_key_lookup()`.

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