Copyright 2010 by Ben Greear <greearb@candelatech.com>
SPDX-License-Identifier: MIT

ares_set_local_dev - Bind to a specific network device when creating sockets.

#include <ares.h>

void ares_set_local_dev(ares_channel_t *channel, const char* local_dev_name)

The ares_set_local_dev function causes all future sockets to be bound to this device with SO_BINDTODEVICE. This forces communications to go over a certain interface, which can be useful on multi-homed machines. This option is only supported on Linux, and root privileges are required for the option to work. If SO_BINDTODEVICE is not supported or the setsocktop call fails (probably because of permissions), the error is silently ignored. ares_set_local_ip4 (3) ares_set_local_ip6 (3) This function was added in c-ares 1.7.4 Ben Greear