1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)gethostid.3 8.1 (Berkeley) 6/2/93 29.\" $FreeBSD: src/lib/libc/compat-43/gethostid.3,v 1.5.2.6 2003/03/15 15:11:05 trhodes Exp $ 30.\" 31.Dd November 26, 2016 32.Dt GETHOSTID 3 33.Os 34.Sh NAME 35.Nm gethostid , 36.Nm sethostid 37.Nd get/set unique identifier of current host 38.Sh LIBRARY 39.Lb libc 40.Sh SYNOPSIS 41.In unistd.h 42.Ft long 43.Fn gethostid void 44.Ft void 45.Fn sethostid "long hostid" 46.Sh DESCRIPTION 47The 48.Fn sethostid 49function 50establishes a 32-bit identifier for the 51current processor that is intended to be unique among all 52.Ux 53systems in existence. This is normally a DARPA Internet 54address for the local machine. This call is allowed only to the 55super-user and is normally performed at boot time. 56.Pp 57The 58.Fn gethostid 59function 60returns the 32-bit identifier for the current processor. 61.Pp 62This function has been deprecated. 63The hostid should be set or retrieved by use of 64.Xr sysctl 3 . 65.Sh SEE ALSO 66.Xr gethostname 3 , 67.Xr sysctl 3 , 68.Xr sysctl 8 69.Sh HISTORY 70The 71.Fn gethostid 72and 73.Fn sethostid 74syscalls appeared in 75.Bx 4.2 76and were dropped in 77.Bx 4.4 . 78.Sh BUGS 7932 bits for the identifier is too small. 80