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>LINK_ADDR(3)            System Library Functions Manual           LINK_ADDR(3)
 
NAME
     link_addr, link_ntoa - elementary address specification routines for link
     level access
 
SYNOPSIS
     #include &lt;sys/types.h&#62;
     #include &lt;sys/socket.h&#62;
     #include &lt;net/if_dl.h&#62;
 
     void
     link_addr(const char *addr, struct sockaddr_dl *sdl);
 
     char *
     link_ntoa(const struct sockaddr_dl *sdl);
 
DESCRIPTION
     The link_addr() function interprets character strings representing link-
     level addresses, returning binary information suitable for use in system
     calls.  link_ntoa() takes a link-level address and returns an 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.
 
     For link_addr(), the string addr may contain an optional network inter-
     face identifier of the form ``name unit-number'', suitable for the first
     argument to ifconfig(8), followed in all cases by a colon and an inter-
     face address in the form of groups of hexadecimal digits separated by
     periods.  Each group represents a byte of address; address bytes are
     filled left to right from low order bytes through high order bytes.
 
     Thus le0:8.0.9.13.d.30 represents an Ethernet address to be transmitted
     on the first Lance Ethernet interface.
 
RETURN VALUES
     link_ntoa() always returns a null-terminated string.  link_addr() has no
     return value.  (See BUGS.)
 
SEE ALSO
     iso(4), ifconfig(8)
 
HISTORY
     The link_addr() and link_ntoa() functions appeared in 4.3BSD-Reno.
 
BUGS
     The returned values for link_ntoa reside in a static memory area.
 
     The function link_addr() should diagnose improperly formed input, and
     there should be an unambiguous way to recognize this.
 
     If the sdl_len field of the link socket address sdl is 0, link_ntoa()
     will not insert a colon before the interface address bytes.  If this
     translated address is given to link_addr() without inserting an initial
     colon, the latter will not interpret it correctly.
 
BSD                              July 28, 1993                             BSD
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1	28	unneback	`<!-- Copyright (C) 2003 Red Hat, Inc. -->`
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3			`<!-- and conditions set forth in the Open Publication License, v1.0 -->`
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94			`>LINK_ADDR(3) System Library Functions Manual LINK_ADDR(3)`
95
96			`NAME`
97			`link_addr, link_ntoa - elementary address specification routines for link`
98			`level access`
99
100			`SYNOPSIS`
101			`#include <sys/types.h>`
102			`#include <sys/socket.h>`
103			`#include <net/if_dl.h>`
104
105			`void`
106			`link_addr(const char addr, struct sockaddr_dl sdl);`
107
108			`char *`
109			`link_ntoa(const struct sockaddr_dl *sdl);`
110
111			`DESCRIPTION`
112			`The link_addr() function interprets character strings representing link-`
113			`level addresses, returning binary information suitable for use in system`
114			`calls. link_ntoa() takes a link-level address and returns an ASCII`
115			`string representing some of the information present, including the link`
116			`level address itself, and the interface name or number, if present. This`
117			`facility is experimental and is still subject to change.`
118
119			`For link_addr(), the string addr may contain an optional network inter-`
120			face identifier of the form ``name unit-number'', suitable for the first
121			`argument to ifconfig(8), followed in all cases by a colon and an inter-`
122			`face address in the form of groups of hexadecimal digits separated by`
123			`periods. Each group represents a byte of address; address bytes are`
124			`filled left to right from low order bytes through high order bytes.`
125
126			`Thus le0:8.0.9.13.d.30 represents an Ethernet address to be transmitted`
127			`on the first Lance Ethernet interface.`
128
129			`RETURN VALUES`
130			`link_ntoa() always returns a null-terminated string. link_addr() has no`
131			`return value. (See BUGS.)`
132
133			`SEE ALSO`
134			`iso(4), ifconfig(8)`
135
136			`HISTORY`
137			`The link_addr() and link_ntoa() functions appeared in 4.3BSD-Reno.`
138
139			`BUGS`
140			`The returned values for link_ntoa reside in a static memory area.`
141
142			`The function link_addr() should diagnose improperly formed input, and`
143			`there should be an unambiguous way to recognize this.`
144
145			`If the sdl_len field of the link socket address sdl is 0, link_ntoa()`
146			`will not insert a colon before the interface address bytes. If this`
147			`translated address is given to link_addr() without inserting an initial`
148			`colon, the latter will not interpret it correctly.`
149
150			`BSD July 28, 1993 BSD`
151			`</PRE`
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