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.
SVr4 includes
gethostid() but not
sethostid(). POSIX.1-2001 specifies
gethostid() but not
sethostid().
FILES
/etc/hostid
EXAMPLE
id = gethostid ();
/* This is a no-op unless unsigned int is wider than 32 bits. */
id &= 0xffffffff;
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