80 lines
2.8 KiB
Groff
80 lines
2.8 KiB
Groff
.\" $Id$
|
|
.\"
|
|
.\" Copyright 1998 by the Massachusetts Institute of Technology.
|
|
.\" Copyright (C) 2008-2010 by Daniel Stenberg
|
|
.\"
|
|
.\" Permission to use, copy, modify, and distribute this
|
|
.\" software and its documentation for any purpose and without
|
|
.\" fee is hereby granted, provided that the above copyright
|
|
.\" notice appear in all copies and that both that copyright
|
|
.\" notice and this permission notice appear in supporting
|
|
.\" documentation, and that the name of M.I.T. not be used in
|
|
.\" advertising or publicity pertaining to distribution of the
|
|
.\" software without specific, written prior permission.
|
|
.\" M.I.T. makes no representations about the suitability of
|
|
.\" this software for any purpose. It is provided "as is"
|
|
.\" without express or implied warranty.
|
|
.\"
|
|
.TH ARES_GET_SERVERS 3 "5 March 2010"
|
|
.SH NAME
|
|
ares_get_servers \- Retrieve name servers from an initialized ares_channel
|
|
.SH SYNOPSIS
|
|
.nf
|
|
.B #include <ares.h>
|
|
.PP
|
|
.B int ares_get_servers(ares_channel \fIchannel\fP, struct ares_addr_node **\fIservers\fP)
|
|
.fi
|
|
.SH DESCRIPTION
|
|
The \fBares_get_servers(3)\fP function retrieves name servers configuration
|
|
from the
|
|
channel data identified by
|
|
.IR channel ,
|
|
as a linked list of ares_addr_node structs storing a pointer to the first
|
|
node at the address specified by
|
|
.IR servers .
|
|
|
|
Function caller may traverse the returned name server linked list, or may use
|
|
it directly as suitable input for the \fBares_set_servers(3)\fP function, 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 \fBares_free_data(3)\fP , once the caller
|
|
does not need it any longer.
|
|
|
|
This function is capable of handling IPv4 and IPv6 name server
|
|
addresses simultaneously, rendering \fBares_save_options(3)\fP with
|
|
optmask \fBARES_OPT_SERVERS\fP functionally obsolete except for
|
|
IPv4-only name server usage.
|
|
|
|
.SH RETURN VALUES
|
|
.B ares_get_servers(3)
|
|
may return any of the following values:
|
|
.TP 15
|
|
.B ARES_SUCCESS
|
|
The name servers configuration was successfuly retrieved
|
|
.TP 15
|
|
.B ARES_ENOMEM
|
|
The memory was exhausted
|
|
.TP 15
|
|
.B ARES_ENODATA
|
|
The channel data identified by
|
|
.IR channel
|
|
was invalid.
|
|
.SH SEE ALSO
|
|
.BR ares_set_servers (3),
|
|
.BR ares_init_options (3),
|
|
.BR ares_save_options(3)
|
|
.SH AVAILABILITY
|
|
ares_get_servers(3) was added in c-ares 1.7.1
|
|
.SH AUTHOR
|
|
Implementation of this function and associated library internals are based
|
|
on code, comments and feedback provided 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.
|
|
.br
|
|
Copyright 1998 by the Massachusetts Institute of Technology.
|
|
.br
|
|
Copyright (C) 2008-2010 by Daniel Stenberg
|