GETHOSTID(2) — UNIX Programmer’s Manual
NAME
gethostid, sethostid − get/set unique identifier of current host
SYNOPSIS
hostid = gethostid()
int hostid;
sethostid(hostid)
int hostid;
DESCRIPTION
Sethostid establishes a 32-bit identifier for the current processor which is intended to be unique among all UNIX systems in existence. This is normally a DARPA Internet address for the local machine. This call is allowed only to the super-user and is normally performed at boot time.
Gethostid returns the 32-bit identifier for the current processor.
SEE ALSO
BUGS
32 bits for the identifier is too small.
4BSD