NAME
gethostid, sethostid - get or set the unique identifier of
the current host
SYNOPSIS
#include <unistd.h>
long int gethostid(void);
int sethostid(long int 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 VALUES
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)