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ETHER_ATON(3)			    Linux Programmer's Manual			    ETHER_ATON(3)

       ether_aton,   ether_ntoa,   ether_ntohost,   ether_hosttonn,   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);

       ether_ntohost(char *hostname, const struct ether_addr *addr);

       ether_hostton(const char *hostname, struct ether_addr *addr);

       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 over-

       The ether_ntohost() function maps an Ethernet address to  the  corresponding  hostname  in
       /etc/ethers and returns non-zero if it cannot be found.

       The  ether_hostton()  function  maps  a	hostname to the corresponding Ethernet address in
       /etc/ethers and returns non-zero 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 non-zero if it cannot be parsed.  The buffer pointed at by hostname must
       be sufficiently long, e.g., 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 {
		u_int8_t ether_addr_octet[6];

       The glibc 2.2.5 implementation of ether_line() is broken.

       BSD 4.3, SunOS


BSD					    2002-07-20				    ETHER_ATON(3)
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