gethostid, sethostid - get or set the unique identifier of
the current host
long int gethostid(void);
int sethostid(long int hostid);
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 resem
bles 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.
gethostid returns the 32-bit identifier for the current
host as set by sethostid(2).
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