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86 lines
3.0 KiB
86 lines
3.0 KiB
.\" |
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.\" Copyright 2010 by Ben Greear <greearb@candelatech.com> |
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.\" SPDX-License-Identifier: MIT |
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.\" |
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.TH ARES_SET_SERVERS 3 "5 March 2010" |
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.SH NAME |
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ares_set_servers, ares_set_servers_ports \- Initialize name server configuration |
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for an ares channel. (deprecated) |
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.SH SYNOPSIS |
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.nf |
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#include <ares.h> |
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int ares_set_servers(ares_channel_t *\fIchannel\fP, |
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const struct ares_addr_node *\fIservers\fP) |
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int ares_set_servers_ports(ares_channel_t *\fIchannel\fP, |
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const struct ares_addr_port_node *\fIservers\fP) |
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.fi |
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.SH DESCRIPTION |
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The \fBares_set_servers(3)\fP function initializes name servers configuration |
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for the channel data identified by |
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.IR channel , |
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from a |
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.IR servers |
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pointer to a linked list of ares_addr_node structs holding name servers |
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address data. |
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.PP |
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The name server linked list pointer argument may be the result of a previous |
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call to \fBares_get_servers(3)\fP or a linked list of \fBares_addr_node\fP structs |
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set up by other means. |
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.PP |
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The \fBares_set_servers_ports(3)\fP function also allows the specification of UDP and |
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TCP ports to be used for communication on a per-server basis. The provided |
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linked list argument may be the result of a previous call to |
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\fBares_get_servers_ports(3)\fP or a linked list of \fBares_addr_port_node\fP structs |
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set up by other means. |
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.PP |
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This function replaces any potentially previously configured name servers |
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with the ones given in the linked list. So, in order to configure a channel |
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with more than one name server all the desired ones must be specified in a |
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single list. Though not recommended, passing NULL will clear all configured |
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servers and make an inoperable channel, this may be advantageous for test |
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simulation but unlikely to be useful in production. |
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.PP |
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The function does not take ownership of the linked list argument. |
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The caller is responsible for freeing the linked list when no longer needed. |
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.PP |
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This function is capable of handling IPv4 and IPv6 name server |
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addresses simultaneously, rendering \fBares_init_options(3)\fP with |
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optmask \fBARES_OPT_SERVERS\fP functionally obsolete except for |
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IPv4-only name server usage. |
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.PP |
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As of v1.22.0 this function can |
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be called on an active channel with running queries, previously it would return |
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ARES_ENOTIMP. |
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.SH RETURN VALUES |
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.B ares_set_servers(3) |
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may return any of the following values: |
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.TP 15 |
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.B ARES_SUCCESS |
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The name servers configuration was successfully initialized. |
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.TP 15 |
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.B ARES_ENOMEM |
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The process's available memory was exhausted. |
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.TP 15 |
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.B ARES_ENODATA |
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The channel data identified by |
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.IR channel |
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was invalid. |
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.TP 15 |
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.B ARES_ENOTINITIALIZED |
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c-ares library initialization not yet performed. |
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.SH SEE ALSO |
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.BR ares_set_servers_csv (3), |
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.BR ares_get_servers (3), |
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.BR ares_init_options (3), |
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.BR ares_dup (3) |
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.SH NOTES |
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Deprecated functions as of c-ares 1.24.0 due to inability to set all available |
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server options. Use \fBares_set_servers_csv(3)\fP. |
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.SH AVAILABILITY |
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\fBares_set_servers(3)\fP was added in c-ares 1.7.1; |
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\fBares_set_servers_ports(3)\fP was added in c-ares 1.11.0.
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