ares_mkquery(3)

ARES_MKQUERY(3)        C LIBRARY FUNCTIONS        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,
          unsigned short id, int rd, unsigned
          int *buflen)

DESCRIPTION

     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  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.

     Usage of ares_mkquery(3) is deprecated, whereas the function
     is  equivalent to ares_create_query(3) with max_udp_size set
     to 0.

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

                    Last change: 20 Nov 2009                    1

ARES_MKQUERY(3)        C LIBRARY FUNCTIONS        ARES_MKQUERY(3)

     Technology.

                    Last change: 20 Nov 2009                    2