path: root/ares_set_servers.3
diff options
authorYang Tse <>2010-03-05 20:01:47 (GMT)
committerYang Tse <>2010-03-05 20:01:47 (GMT)
commit8fe746fcf2d5b54242a828840ccac630f7a4075a (patch)
tree0ae06cf5be407aea2129f1b47c59c1f433d425db /ares_set_servers.3
parent249fc61b8cf1848c4444bef60fc6248930bd0d20 (diff)
Added IPv6 name servers support
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+.\" $Id$
+.\" 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_SET_SERVERS 3 "5 March 2010"
+ares_set_servers \- Initialize an ares_channel name servers configuration
+.B #include <ares.h>
+.B int ares_set_servers(ares_channel \fIchannel\fP, struct ares_addr_node *\fIservers\fP)
+The \fBares_set_servers(3)\fP function initializes name servers configuration
+for the channel data identified by
+.IR channel ,
+from a
+.IR servers
+pointer to a linked list of ares_addr_node structs holding name servers
+address data.
+The name server linked list pointer argument may be the result of a previous
+call to \fBares_get_servers(3)\fP or a linked list of ares_addr_node structs
+setup by other means.
+This function replaces any potentially previously configured name servers
+with the ones given in the linked list. So, in order to configure a channel
+with more than one name server all the desired ones must be specified in a
+single list.
+\fBares_set_servers(3)\fP does not take ownership of the linked list argument.
+The caller is responsible to free the linked list when no longer needed.
+This function is capable of handling IPv4 and IPv6 name server
+addresses simultaneously, rendering \fBares_init_options(3)\fP with
+optmask \fBARES_OPT_SERVERS\fP functionally obsolete except for
+IPv4-only name server usage.
+.B ares_set_servers(3)
+may return any of the following values:
+.TP 15
+The name servers configuration was successfuly initialized.
+.TP 15
+The process's available memory was exhausted.
+.TP 15
+The channel data identified by
+.IR channel
+was invalid.
+.TP 15
+c-ares library initialization not yet performed.
+.BR ares_get_servers (3),
+.BR ares_init_options (3),
+.BR ares_dup(3)
+ares_set_servers(3) was added in c-ares 1.7.1
+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.
+Copyright 1998 by the Massachusetts Institute of Technology.
+Copyright (C) 2008-2010 by Daniel Stenberg