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BSD 2.11 - man page for sethostid (bsd section 2)

GETHOSTID(2)							System Calls Manual						      GETHOSTID(2)

NAME
gethostid, sethostid - get/set unique identifier of current host
SYNOPSIS
hostid = gethostid() long hostid; sethostid(hostid) long hostid;
DESCRIPTION
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.
SEE ALSO
hostid(1), gethostname(2)
BUGS
32 bits for the identifier is too small. 4.2 Berkeley Distribution November 28, 1985 GETHOSTID(2)