#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
int res_nmkquery(state* res,
int operation,
const char *domain_name,
int class,
int type,
const unsigned char *search_data,
int search_data_length,
const unsigned char *reserved,
unsigned char *query_buffer,
int query_buffer_length)
The res_nmkquery() function is similar to res_mkquery() but it uses a user-declared res pointer instead of the shared _res.
For a description of this function and more information on the parameters, authorities required, return values, error conditions, error messages, usage notes, and related information, see res_mkquery()--Place Domain Query in Buffer.