2020-11-16 14:47:43 +08:00
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.\"
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.\" Copyright 2010 by Ben Greear <greearb@candelatech.com>
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.\"
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.\" Permission to use, copy, modify, and distribute this
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.\" software and its documentation for any purpose and without
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.\" fee is hereby granted, provided that the above copyright
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.\" notice appear in all copies and that both that copyright
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.\" notice and this permission notice appear in supporting
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.\" documentation, and that the name of M.I.T. not be used in
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.\" advertising or publicity pertaining to distribution of the
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.\" software without specific, written prior permission.
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.\" M.I.T. makes no representations about the suitability of
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.\" this software for any purpose. It is provided "as is"
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.\" without express or implied warranty.
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.\"
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.TH ARES_SET_LOCAL_DEV 3 "30 June 2010"
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.SH NAME
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ares_set_local_dev \- Bind to a specific network device when creating sockets.
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.SH SYNOPSIS
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.nf
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2023-02-04 15:03:54 +08:00
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#include <ares.h>
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void ares_set_local_dev(ares_channel \fIchannel\fP, const char* \fIlocal_dev_name\fP)
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2020-11-16 14:47:43 +08:00
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.fi
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.SH DESCRIPTION
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The \fBares_set_local_dev\fP function causes all future sockets
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to be bound to this device with SO_BINDTODEVICE. This forces communications
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to go over a certain interface, which can be useful on multi-homed machines.
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This option is only supported on Linux, and root privileges are required
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for the option to work. If SO_BINDTODEVICE is not supported or the
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setsocktop call fails (probably because of permissions), the error is
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silently ignored.
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.SH SEE ALSO
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.BR ares_set_local_ip4 (3)
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.BR ares_set_local_ip6 (3)
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.SH NOTES
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This function was added in c-ares 1.7.4
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.SH AUTHOR
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Ben Greear
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