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.\" Copyright 2010 by Ben Greear <>
.\" Permission to use, copy, modify, and distribute this
.\" software and its documentation for any purpose and without
.\" fee is hereby granted, provided that the above copyright
.\" notice appear in all copies and that both that copyright
.\" notice and this permission notice appear in supporting
.\" documentation, and that the name of M.I.T. not be used in
.\" advertising or publicity pertaining to distribution of the
.\" software without specific, written prior permission.
.\" M.I.T. makes no representations about the suitability of
.\" this software for any purpose. It is provided "as is"
.\" without express or implied warranty.
.TH ARES_SET_LOCAL_DEV 3 "30 June 2010"
ares_set_local_dev \- Bind to a specific network device when creating sockets.
.B #include <ares.h>
.B void ares_set_local_dev(ares_channel \fIchannel\fP, const char* \fIlocal_dev_name\fP)
The \fBares_set_local_dev\fP 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 priviledges 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.
.BR ares_set_local_ipv4 (3)
.BR ares_set_local_ipv6 (3)
This function was added in c-ares 1.7.4
Ben Greear