EUI64(3)               FreeBSD Library Functions Manual               EUI64(3)

NAME
     eui64, eui64_aton, eui64_ntoa, eui64_ntohost, eui64_hostton - IEEE EUI-64
     conversion and lookup routines

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <sys/types.h>
     #include <sys/eui64.h>

     int
     eui64_aton(const char *a, struct eui64 *e);

     int
     eui64_ntoa(const struct eui64 *id, char *a, size_t len);

     int
     eui64_ntohost(char *hostname, size_t len, const struct eui64 *id);

     int
     eui64_hostton(const char *hostname, struct eui64 *id);

DESCRIPTION
     These functions operate on IEEE EUI-64s using an eui64 structure, which
     is defined in the header file <sys/eui64.h>:

           /*
            * The number of bytes in an EUI-64.
            */
           #define EUI64_LEN               8

           /*
            * Structure of an IEEE EUI-64.
            */
           struct  eui64 {
                   u_char octet[EUI64_LEN];
           };

     The eui64_aton() function converts an ASCII representation of an EUI-64
     into an eui64 structure.  Likewise, eui64_ntoa() converts an EUI-64
     specified as an eui64 structure into an ASCII string.

     The eui64_ntohost() and eui64_hostton() functions map EUI-64s to their
     corresponding hostnames as specified in the /etc/eui64 database.  The
     eui64_ntohost() function converts from EUI-64 to hostname, and
     eui64_hostton() converts from hostname to EUI-64.

RETURN VALUES
     On success, eui64_ntoa() returns a pointer to a string containing an
     ASCII representation of an EUI-64.  If it is unable to convert the
     supplied eui64 structure, it returns a NULL pointer.  Likewise,
     eui64_aton() returns a pointer to an eui64 structure on success and a
     NULL pointer on failure.

     The eui64_ntohost() and eui64_hostton() functions both return zero on
     success or non-zero if they were unable to find a match in the /etc/eui64
     database.

NOTES
     The user must ensure that the hostname strings passed to the
     eui64_ntohost() and eui64_hostton() functions are large enough to contain
     the returned hostnames.

NIS INTERACTION
     If the /etc/eui64 contains a line with a single `+' in it, the
     eui64_ntohost() and eui64_hostton() functions will attempt to consult the
     NIS eui64.byname and eui64.byid maps in addition to the data in the
     /etc/eui64 file.

SEE ALSO
     firewire(4), eui64(5), yp(8)

HISTORY
     These functions first appears in FreeBSD 5.3.  They are derived from the
     ethers(3) family of functions.

FreeBSD 13.1-RELEASE-p6          March 4, 2004         FreeBSD 13.1-RELEASE-p6