ARES_SET_LOCAL_DEV(3) Introduction to Library Functions

NAME

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

SYNOPSIS

#include <ares.h>

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

DESCRIPTION

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.

SEE ALSO

ares_set_local_ip4(3) ares_set_local_ip6(3) network_namespaces(7)

NOTES

This function was added in c-ares 1.7.4

23 September 2024 ARES_SET_LOCAL_DEV(3)