Section: C Library Functions (3)
Updated: 30 June 2010
ares_set_local_dev - Bind to a specific network device when creating sockets.
void ares_set_local_dev(ares_channel channel, const char* local_dev_name)
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
This function was added in c-ares 1.7.4