ether_aton, ether_ntoa, ether_ntohost, ether_hostton, ether_line, ether_ntoa_r, ether_aton_r — Ethernet address manipulation routines
#include <netinet/ether.h>
char
*ether_ntoa( |
const struct ether_addr * | addr); |
struct ether_addr *ether_aton( |
const char * | asc); |
int
ether_ntohost( |
char * | hostname, |
| const struct ether_addr * | addr); |
int
ether_hostton( |
const char * | hostname, |
| struct ether_addr * | addr); |
int
ether_line( |
const char * | line, |
| struct ether_addr * | addr, | |
| char * | hostname); |
/* GNU extensions */
char
*ether_ntoa_r( |
const struct ether_addr * | addr, |
| char * | buf); |
struct ether_addr *ether_aton_r( |
const char * | asc, |
| struct ether_addr * | addr); |
ether_aton() converts the
48-bit Ethernet host address asc from the standard
hex-digits-and-colons notation into binary data in network
byte order and returns a pointer to it in a statically
allocated buffer, which subsequent calls will overwrite.
ether_aton() returns NULL if
the address is invalid.
The ether_ntoa() function
converts the Ethernet host address addr given in network byte
order to a string in standard hex-digits-and-colons notation,
omitting leading zeroes. The string is returned in a
statically allocated buffer, which subsequent calls will
overwrite.
The ether_ntohost() function
maps an Ethernet address to the corresponding hostname in
/etc/ethers and returns nonzero
if it cannot be found.
The ether_hostton() function
maps a hostname to the corresponding Ethernet address in
/etc/ethers and returns nonzero
if it cannot be found.
The ether_line() function
parses a line in /etc/ethers
format (ethernet address followed by whitespace followed by
hostname; '#' introduces a comment) and returns an address
and hostname pair, or nonzero if it cannot be parsed. The
buffer pointed to by hostname must be sufficiently
long, for example, have the same length as line.
The functions ether_ntoa_r()
and ether_aton_r() are
re-entrant threadsafe versions of ether_ntoa() and ether_aton() respectively, and do not use
static buffers.
The structure ether_addr
is defined in <net/ethernet.h> as:
struct ether_addr { uint8_t ether_addr_octet[6];};
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
|
Copyright 2002 Ian Redfern (redfernilogica.com) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. References consulted: Linux libc source code FreeBSD 4.4 man pages Minor additions, aeb, 2002-07-20 |