ETHERS(3N)ETHERS(3N)NAME
ethers, ether_ntoa, ether_aton, ether_ntohost, ether_hostton,
ether_line - Ethernet address mapping operations
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 corresponding 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 hostname and a NULL character. The function
returns zero upon success and non-zero upon failure. Inversely, the
function 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 success 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(5).
FILES
/etc/ethers (or the Yellow Pages maps ethers.byaddr and
ethers.byname)
SEE ALSOethers(5)
16 February 1988 ETHERS(3N)
