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+NAME="NET-COMMON-TCPIP-MANPAGES-ETHERS">ethers</H1
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+CLASS="SCREEN"
+>ETHERS(3) System Library Functions Manual ETHERS(3)
+
+NAME
+ ether_aton, ether_ntoa, ether_addr, ether_ntohost, ether_hostton,
+ ether_line - get ethers entry
+
+SYNOPSIS
+ #include <netinet/if_ether.h>
+
+ char *
+ ether_ntoa(struct ether_addr *e);
+
+ struct ether_addr *
+ ether_aton(char *s);
+
+ int
+ ether_ntohost(char *hostname, struct ether_addr *e);
+
+ int
+ ether_hostton(char *hostname, struct ether_addr *e);
+
+ int
+ ether_line(char *l, struct ether_addr *e, char *hostname);
+
+DESCRIPTION
+ Ethernet addresses are represented by the following structure:
+
+ struct ether_addr {
+ u_int8_t ether_addr_octet[6];
+ };
+
+ The ether_ntoa() function converts this structure into an ASCII string of
+ the form ``xx:xx:xx:xx:xx:xx'', consisting of 6 hexadecimal numbers sepa-
+ rated by colons. It returns a pointer to a static buffer that is reused
+ for each call. The ether_aton() converts an ASCII string of the same
+ form and to a structure containing the 6 octets of the address. It
+ returns a pointer to a static structure that is reused for each call.
+
+ The ether_ntohost() and ether_hostton() functions interrogate the
+ database mapping host names to Ethernet addresses, /etc/ethers. The
+ ether_ntohost() function looks up the given Ethernet address and writes
+ the associated host name into the character buffer passed. This buffer
+ should be MAXHOSTNAMELEN characters in size. The ether_hostton() func-
+ tion looks up the given host name and writes the associated Ethernet
+ address into the structure passed. Both functions return zero if they
+ find the requested host name or address, and -1 if not.
+
+ Each call reads /etc/ethers from the beginning; if a `+' appears alone on
+ a line in the file, then ether_hostton() will consult the ethers.byname
+ YP map, and ether_ntohost() will consult the ethers.byaddr YP map.
+
+ The ether_line() function parses a line from the /etc/ethers file and
+ fills in the passed struct ether_addr and character buffer with the Eth-
+ ernet address and host name on the line. It returns zero if the line was
+ successfully parsed and -1 if not. The character buffer should be
+ MAXHOSTNAMELEN characters in size.
+
+FILES
+ /etc/ethers
+
+SEE ALSO
+ ethers(5)
+
+HISTORY
+ The ether_ntoa(), ether_aton(), ether_ntohost(), ether_hostton(), and
+ ether_line() functions were adopted from SunOS and appeared in NetBSD 0.9
+ b.
+
+BUGS
+ The data space used by these functions is static; if future use requires
+ the data, it should be copied before any subsequent calls to these func-
+ tions overwrite it.
+
+BSD December 16, 1993 BSD
+ </PRE
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