Man page - ares_set_local_dev(3)

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Manual

ARES_SET_LOCAL_DEV

NAME
SYNOPSIS
DESCRIPTION
SEE ALSO
NOTES

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