ARES_MKQUERY(3) 					     Library Functions Manual						   ARES_MKQUERY(3)

NAME

       ares_mkquery - Compose a single-question DNS query buffer

SYNOPSIS

       #include <ares.h>

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

DESCRIPTION

       The  ares_mkquery  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 optionally 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.

RETURN VALUES

       ares_mkquery 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.

SEE ALSO

       ares_expand_name(3), ares_free_string(3)

AUTHOR

       Greg Hudson, MIT Information Systems
       Copyright 1998, 2000 by the Massachusetts Institute of Technology.

								    20 Nov 2009 						   ARES_MKQUERY(3)