ethers(3N)                                             ethers(3N)



NAME
     ethers, ether_ntoa, ether_aton, ether_ntohost,
     ether_hostton, ether_line - Ethernet address mapping opera-
     tions

SYNOPSIS
     #include <sys/types.h>
     #include <sys/socket.h>
     #include <net/if.h>
     #include <netinet/in.h>
     #include <netinet/if_ether.h>

     char *
     ether_ntoa(e)
          struct ether_addr *e;

     struct ether_addr *
     ether_aton(s)
          char *s;

     ether_ntohost(hostname, e)
          char *hostname;
          struct ether_addr *e;

     ether_hostton(hostname, e)
          char *hostname;
          struct ether_addr *e;

     ether_line(l, e, hostname)
          char *l;
          struct ether_addr *e;
          char *hostname;

DESCRIPTION
     These routines are useful for mapping 48 bit Ethernet
     numbers to their ASCII representations or their correspond-
     ing host names, and vice versa.

     The function ether_ntoa() converts a 48 bit Ethernet number
     pointed to by e to its standard ACSII representation; it
     returns a pointer to the ASCII string.  The representation
     is of the form:  x:x:x:x:x:x where x is a hexadecimal number
     between 0 and ff.  The function ether_aton() converts an
     ASCII string in the standard representation back to a 48 bit
     Ethernet number;  the function returns NULL if the string
     cannot be scanned successfully.

     The function ether_ntohost() maps an Ethernet number
     (pointed to by e) to its associated hostname.  The string
     pointed to by hostname must be long enough to hold the host-
     name and a NULL character.  The function returns zero upon
     success and non-zero upon failure.  Inversely, the function



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ethers(3N)                                             ethers(3N)



     ether_hostton() maps a hostname string to its corresponding
     Ethernet number; the function modifies the Ethernet number
     pointed to by e.  The function also returns zero upon suc-
     cess and non-zero upon failure.

     The function ether_line() scans a line (pointed to by l) and
     sets the hostname and the Ethernet number (pointed to by e).
     The string pointed to by hostname must be long enough to
     hold the hostname and a NULL character.  The function
     returns zero upon success and non-zero upon failure.  The
     format of the scanned line is described by ethers(4).

FILES
     /etc/ethers         (or the Yellow Pages maps ethers.byaddr
                         and ethers.byname)

SEE ALSO
     ethers(4)





































Page 2                        CX/UX Programmer's Reference Manual