gethostid(2) -- Linux man page
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)
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