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EUI64(3)              DragonFly 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 spec-
     ified 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 sup-
     plied 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 insure 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.


BUGS

     The eui64_aton() and eui64_ntoa() functions returns values that are
     stored in static memory areas which may be overwritten the next time they
     are called.

DragonFly 3.5                    March 4, 2004                   DragonFly 3.5

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