1 .\" $Id: ares_mkquery.3,v 1.5 2000/09/21 19:15:50 ghudson Exp $
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17 .TH ARES_MKQUERY 3 "4 January 2000"
19 ares_mkquery \- Compose a single-question DNS query buffer
25 int ares_mkquery(const char *\fIname\fP, int \fIdnsclass\fP, int \fItype\fP,
27 unsigned short \fIid\fP, int \fIrd\fP, char **\fIbuf\fP,
33 function composes a DNS query with a single question.
36 gives the query name as a NUL-terminated C string of period-separated
37 labels optionally ending with a period; periods and backslashes within
38 a label must be escaped with a backlash. The parameters
42 give the class and type of the query using the values defined in
43 .BR <arpa/nameser.h> .
46 gives a 16-bit identifier for the query. The parameter
48 should be nonzero if recursion is desired, zero if not. The query
49 will be placed in an allocated buffer, a pointer to which will be
50 stored in the variable pointed to by
52 and the length of which will be stored in the variable pointed to by
54 It is the caller's responsibility to free this buffer using
56 when it is no longer needed.
59 can return any of the following values:
62 Construction of the DNS query succeeded.
67 could not be encoded as a domain name, either because it contained a
68 zero-length label or because it contained a label of more than 63
74 .BR ares_expand_name (3),
75 .BR ares_free_string (3)
77 Greg Hudson, MIT Information Systems
79 Copyright 1998, 2000 by the Massachusetts Institute of Technology.