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


     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 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
     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]; }


     For   an   explanation   of   the  terms  used  in  this  section,  see
     |Interface                         | Attribute     | Value     |
     |ether_aton(), ether_ntoa()        | Thread safety | MT-Unsafe |
     |ether_ntohost(), ether_hostton(), | Thread safety | MT-Safe   |
     |ether_line(), ether_ntoa_r(),     |               |           |
     |ether_aton_r()                    |               |           |


     4.3BSD, SunOS.


     In glibc 2.2.5 and earlier, the implementation of ether_line() is  bro-




     This  page  is  part of release 4.16 of the Linux man-pages project.  A
     description of the project, information about reporting bugs,  and  the
     latest     version     of     this    page,    can    be    found    at

GNU 2017-09-15 ETHER_ATON(3)

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