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sethostid(2) [bsd man page]

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)

Check Out this Related Man Page

GETHOSTID(2)						     Linux Programmer's Manual						      GETHOSTID(2)

NAME
gethostid, sethostid - get or set the unique identifier of the current host SYNOPSIS
#include <unistd.h> long gethostid(void); int sethostid(long hostid); DESCRIPTION
Get or set a unique 32-bit identifier for the current machine. The 32-bit identifier is intended to be unique among all UNIX systems in existence. This normally resembles the Internet address for the local machine, as returned by gethostbyname(3), and thus usually never needs to be set. The sethostid call is restricted to the superuser. The hostid argument is stored in the file /etc/hostid. RETURN VALUE
gethostid returns the 32-bit identifier for the current host as set by sethostid(2). CONFORMING TO
4.2BSD. These functions were dropped in 4.4BSD. POSIX.1 does not define these functions, but ISO/IEC 9945-1:1990 mentions them in B.4.4.1. SVr4 includes gethostid but not sethostid. FILES
/etc/hostid SEE ALSO
hostid(1), gethostbyname(3) Linux 0.99.13 1993-11-29 GETHOSTID(2)

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