link_ntoa man page on 4.4BSD

Man page or keyword search:  
man Server   1065 pages
apropos Keyword Search (all sections)
Output format
4.4BSD logo
[printable version]

LINK_ADDR(3)		 BSD Library Functions Manual		  LINK_ADDR(3)

     link_addr, link_ntoa — elementary address specification routines for link
     level access

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

     link_addr(const char *addr, struct sockaddr_dl *sdl);

     char *
     link_ntoa(const struct sockaddr_dl *sdl);

     The routine link_addr() interprets character strings representing link-
     level addresses, returning binary information suitable for use in system
     calls.  The routine 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(4), 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: represents an ethernet address to be transmitted
     on the first Lance ethernet interface.

     link_ntoa() always returns a null terminated string.  link_addr() has no
     return value.  (See BUGS.)


     The link_addr() and link_ntoa() functions appeared in 4.3BSD-Reno.

     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.

4.4BSD				 July 28, 1993				4.4BSD

List of man pages available for 4.4BSD

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
Vote for polarhome
Free Shell Accounts :: the biggest list on the net