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35 .\" From: @(#)linkaddr.3 8.1 (Berkeley) 7/28/93
36 .\" $FreeBSD: src/lib/libc/net/linkaddr.3,v 1.8.2.4 2001/12/14 18:33:55 ru Exp $
37 .\" $DragonFly: src/lib/libcr/net/Attic/linkaddr.3,v 1.2 2003/06/17 04:26:44 dillon Exp $
45 .Nd elementary address specification routines for link level access
53 .Fn link_addr "const char *addr" "struct sockaddr_dl *sdl"
55 .Fn link_ntoa "const struct sockaddr_dl *sdl"
59 interprets character strings representing
60 link-level addresses, returning binary information suitable
61 for use in system calls.
66 address and returns an
68 string representing some of the information present,
69 including the link level address itself, and the interface name
70 or number, if present.
71 This facility is experimental and is
72 still subject to change.
79 an optional network interface identifier of the form
80 .Dq "name unit-number" ,
81 suitable for the first argument to
83 followed in all cases by a colon and
84 an interface address in the form of
85 groups of hexadecimal digits
87 Each group represents a byte of address;
88 address bytes are filled left to right from
89 low order bytes through high order bytes.
91 .\" A regular expression may make this format clearer:
92 .\" .Bd -literal -offset indent
93 .\" ([a-z]+[0-9]+:)?[0-9a-f]+(\e.[0-9a-f]+)*
98 represents an ethernet address
99 to be transmitted on the first Lance ethernet interface.
101 The direct use of these functions is deprecated in favor of the
103 interface; however, portable programs cannot rely on the latter as it is
104 not yet widely implemented.
107 always returns a null terminated string.
120 functions appeared in
123 The returned values for link_ntoa
124 reside in a static memory area.
128 should diagnose improperly formed input, and there should be an unambiguous
129 way to recognize this.
133 field of the link socket address
137 will not insert a colon before the interface address bytes.
138 If this translated address is given to
140 without inserting an initial colon,
141 the latter will not interpret it correctly.