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. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)gethostid.3 8.1 (Berkeley) 6/2/93 33.\" $FreeBSD$ 34.\" 35.Dd June 2, 1993 36.Dt GETHOSTID 3 37.Os 38.Sh NAME 39.Nm gethostid , 40.Nm sethostid 41.Nd get/set unique identifier of current host 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.In unistd.h 46.Ft long 47.Fn gethostid void 48.Ft void 49.Fn sethostid "long hostid" 50.Sh DESCRIPTION 51The 52.Fn sethostid 53function 54establishes a 32-bit identifier for the 55current processor that is intended to be unique among all 56UNIX systems in existence. This is normally a DARPA Internet 57address for the local machine. This call is allowed only to the 58super-user and is normally performed at boot time. 59.Pp 60The 61.Fn gethostid 62function 63returns the 32-bit identifier for the current processor. 64.Pp 65This function has been deprecated. 66The hostid should be set or retrieved by use of 67.Xr sysctl 3 . 68.Sh SEE ALSO 69.Xr gethostname 3 , 70.Xr sysctl 3 , 71.Xr sysctl 8 72.Sh BUGS 7332 bits for the identifier is too small. 74.Sh HISTORY 75The 76.Fn gethostid 77and 78.Fn sethostid 79syscalls appeared in 80.Bx 4.2 81and were dropped in 82.Bx 4.4 . 83