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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 <sys/types.h>
- #include <sys/socket.h>
- #include <net/if_dl.h>
-
- 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
- </PRE
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