ether_hostton man page on ElementaryOS

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

NAME
       ether_aton,   ether_ntoa,   ether_ntohost,  ether_hostton,  ether_line,
       ether_ntoa_r, ether_aton_r - Ethernet address manipulation routines

SYNOPSIS
       #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);

DESCRIPTION
       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  buf‐
       fer,  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 zeros.  The string is returned in  a	stati‐
       cally allocated buffer, which subsequent calls will overwrite.

       The  ether_ntohost()  function  maps  an Ethernet address to the corre‐
       sponding hostname in /etc/ethers and returns nonzero if	it  cannot  be
       found.

       The  ether_hostton() function maps a hostname to the corresponding Eth‐
       ernet 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 suffi‐
       ciently long, for example, have the same length as line.

       The functions ether_ntoa_r() and ether_aton_r() are  reentrant  thread-
       safe 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];
	   }

ATTRIBUTES
   Multithreading (see pthreads(7))
       The ether_aton() and ether_ntoa() functions are not thread-safe.

       The ether_ntohost(), ether_hostton(), ether_line(), ether_ntoa_r()  and
       ether_aton_r() functions are thread-safe.

CONFORMING TO
       4.3BSD, SunOS.

BUGS
       The glibc 2.2.5 implementation of ether_line() is broken.

SEE ALSO
       ethers(5)

COLOPHON
       This  page  is  part of release 3.54 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/.

GNU				  2013-07-04			 ETHER_ATON(3)
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