CentOS 7.0 - man page for ares_mkquery (centos section 3)
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ares_mkquery - Compose a single-question DNS query buffer
int ares_mkquery(const char *name, int dnsclass, int type,
unsigned short id, int rd, unsigned char **buf,
Deprecated function. See ares_create_query(3) instead!
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 back-
lash. 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.
Usage of ares_mkquery(3) is deprecated, whereas the function is equivalent to ares_cre-
ate_query(3) with max_udp_size set to 0.
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.
Greg Hudson, MIT Information Systems
Copyright 1998, 2000 by the Massachusetts Institute of Technology.
20 Nov 2009 ARES_MKQUERY(3)
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