GETHOSTID(3) BSD Programmer's Manual GETHOSTID(3)
gethostid, sethostid - get/set unique identifier of current host
Sethostid() establishes a 32-bit identifier for the current processor
that 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.
This function has been deprecated. The hostid should be set or retrieved
by use of sysctl(2).
sysctl(2), gethostname(3), sysctl(8).
32 bits for the identifier is too small.
The gethostid() and sethostid() syscalls appeared in 4.2BSD and were
dropped in 4.4BSD.
4.2 Berkeley Distribution June 2, 1993 1