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CentOS 7.0 - man page for ares_create_query (centos section 3)

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       ares_create_query - Compose a single-question DNS query buffer

       #include <ares.h>

       int ares_create_query(const char *name, int dnsclass, int type,
	     unsigned short id, int rd, unsigned char **buf,
	     int *buflen, int max_udp_size)

       The ares_create_query function composes a DNS query with a single question.  The parameter
       name gives the query name as a NUL-terminated C string of period-separated labels  option-
       ally  ending  with a period; periods and backslashes within a label must be escaped with a
       backlash.  The parameters dnsclass and type give the class and type of the query using the
       values  defined	in  <arpa/nameser.h>.  The parameter id gives a 16-bit identifier for the
       query.  The parameter rd should be nonzero if recursion is  desired,  zero  if  not.   The
       query  will  be	placed	in  an allocated buffer, a pointer to which will be stored in the
       variable pointed to by buf, and the length of which will be stored in the variable pointed
       to   by	 buflen.    It	 is  the  caller's  responsibility  to	free  this  buffer  using
       ares_free_string(3) when it is no longer needed.  The  parameter  max_udp_size  should  be
       nonzero	to  activate EDNS. Usage of ares_create_query(3) with max_udp_size set to zero is
       equivalent to ares_mkquery(3).

       ares_create_query can return any of the following values:

       ARES_SUCCESS   Construction of the DNS query succeeded.

       ARES_EBADNAME  The query name name could not be encoded as a domain name,  either  because
		      it  contained  a	zero-length label or because it contained a label of more
		      than 63 characters.

       ARES_ENOMEM    Memory was exhausted.

       Added in c-ares 1.10.0

       ares_expand_name(3), ares_free_string(3)

					   17 Aug 2012			     ARES_CREATE_QUERY(3)
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