ARES_GET_SERVERS(3)    FreeBSD Library Functions Manual    ARES_GET_SERVERS(3)

NAME
       ares_get_servers, ares_get_servers_ports - Retrieve name servers from
       an initialized ares_channel

SYNOPSIS
       #include <ares.h>

       int ares_get_servers(ares_channel channel, struct ares_addr_node **servers)
       int ares_get_servers_ports(ares_channel channel, struct ares_addr_port_node **servers)

DESCRIPTION
       The ares_get_servers(3) function retrieves name servers configuration
       from the channel data identified by channel, as a linked list of
       ares_addr_node structs storing a pointer to the first node at the
       address specified by servers.

       The ares_get_servers_ports(3) function also retrieves any per-server
       port information that may have been previously configured, returning a
       linked list of ares_addr_port structures.

       Function caller may traverse the returned name server linked list, or
       may use it directly as suitable input for the ares_set_servers(3) /
       ares_set_servers_ports(3) functions, but shall not shrink or extend the
       list on its own.

       Each node of the name server linked list is stored in memory
       dynamically allocated and managed by c-ares. It is the caller's
       responsibility to free the resulting linked list, using
       ares_free_data(3) , once the caller does not need it any longer.

       This function is capable of handling IPv4 and IPv6 name server
       addresses simultaneously, rendering ares_save_options(3) with optmask
       ARES_OPT_SERVERS functionally obsolete except for IPv4-only name server
       usage.

RETURN VALUES
       This function may return any of the following values:

       ARES_SUCCESS   The name servers configuration was successfully
                      retrieved

       ARES_ENOMEM    The memory was exhausted

       ARES_ENODATA   The channel data identified by channel was invalid.

SEE ALSO
       ares_set_servers(3), ares_init_options(3), ares_save_options(3)

AVAILABILITY
       ares_get_servers(3) was added in c-ares 1.7.1;
       ares_get_servers_ports(3) was added in c-ares 1.11.0.

AUTHOR
       Implementation of this function and associated library internals are
       based on code, comments and feedback provided in November and December
       of 2008 by Daniel Stenberg, Gregor Jasny, Phil Blundell and Yang Tse,
       December 2009 by Cedric Bail, February 2010 by Jakub Hrozek. On March
       2010 Yang Tse shuffled all the bits and this function popped out.
       Copyright 1998 by the Massachusetts Institute of Technology.
       Copyright (C) 2008-2010 by Daniel Stenberg

                                 5 March 2010              ARES_GET_SERVERS(3)