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.\" $OpenBSD: gethostid.3,v 1.16 2019/03/03 18:15:24 schwarze Exp $ 29.\" 30.Dd $Mdocdate: March 3 2019 $ 31.Dt GETHOSTID 3 32.Os 33.Sh NAME 34.Nm gethostid , 35.Nm sethostid 36.Nd get/set unique identifier of current host 37.Sh SYNOPSIS 38.In unistd.h 39.Ft long 40.Fn gethostid void 41.Ft int 42.Fn sethostid "long hostid" 43.Sh DESCRIPTION 44The 45.Fn sethostid 46function establishes a 32-bit identifier for the 47current processor that is intended to be unique among all 48UNIX systems in existence. 49This is normally an Internet address for the local machine. 50This call is allowed only to the 51superuser and is normally performed at boot-time. 52.Pp 53.Fn gethostid 54returns the 32-bit identifier for the current processor. 55.Pp 56This function has been deprecated. 57The hostid should be set or retrieved by use of 58.Xr sysctl 2 . 59.Sh SEE ALSO 60.Xr sysctl 2 , 61.Xr gethostname 3 , 62.Xr sysctl 8 63.Sh HISTORY 64The 65.Fn gethostid 66and 67.Fn sethostid 68system calls first appeared in 69.Bx 4.1c 70and were dropped in 71.Bx 4.4 . 72.Sh BUGS 7332 bits for the identifier is too small. 74