1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
.\" $OpenBSD: link_ntoa.3,v 1.2 2015/09/10 10:14:20 jmc Exp $
.\"
.\" Copyright (c) 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" Donn Seeley at BSDI.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.Dd $Mdocdate: September 10 2015 $
.Dt LINK_NTOA 3
.Os
.Sh NAME
.Nm link_ntoa
.Nd elementary address specification routine for link level access
.Sh SYNOPSIS
.In sys/types.h
.In sys/socket.h
.In net/if_dl.h
.Ft char *
.Fn link_ntoa "const struct sockaddr_dl *sdl"
.Sh DESCRIPTION
The
.Fn link_ntoa
function takes
a link-level
address and returns an
.Tn ASCII
string representing some of the information present,
including the link level address itself, and the interface name
or number, if present.
This facility is experimental and is
still subject to change.
.Sh RETURN VALUES
.Fn link_ntoa
always returns a NUL-terminated string.
.Sh SEE ALSO
.Xr ifconfig 8
.Sh HISTORY
The
.Fn link_ntoa
function appeared in
.Bx 4.3 Reno .
.Sh BUGS
The returned values for
.Fn link_ntoa
reside in a static memory area.
.Pp
If the
.Fa sdl_len
field of the link socket address
.Fa sdl
is 0,
.Fn link_ntoa
will not insert a colon before the interface address bytes.
|
