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eui64
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 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.
FreeBSD 6.2 March 4, 2004 FreeBSD 6.2
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