ares_set_local_dev3
Bind to a specific network device when creating sockets.
Usage
#include <ares.h> void ares_set_local_dev(ares_channel_t *channel, const char* local_dev_name)
Overview
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, the interface must not be already bound to the socket or the current effective user must have CAP_NET_RAW capability in the current network namespace for the option to work. If SO_BINDTODEVICE is not supported or the setsockopt call fails (probably because of permissions), the error is silently ignored.
Notes
This function was added in c-ares 1.7.4
Releases
6 releases since Debian 9 (Stretch); the text changed 2 times.