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.\" 34.Dd June 2, 1993 35.Dt GETHOSTID 3 36.Os BSD 4.2 37.Sh NAME 38.Nm gethostid , 39.Nm sethostid 40.Nd get/set unique identifier of current host 41.Sh SYNOPSIS 42.Fd #include <unistd.h> 43.Ft long 44.Fn gethostid void 45.Ft int 46.Fn sethostid "long hostid" 47.Sh DESCRIPTION 48.Fn Sethostid 49establishes a 32-bit identifier for the 50current processor that is intended to be unique among all 51UNIX systems in existence. This is normally a DARPA Internet 52address for the local machine. This call is allowed only to the 53super-user and is normally performed at boot time. 54.Pp 55.Fn Gethostid 56returns the 32-bit identifier for the current processor. 57.Pp 58This function has been deprecated. 59The hostid should be set or retrieved by use of 60.Xr sysctl 3 . 61.Sh SEE ALSO 62.Xr gethostname 3 , 63.Xr sysctl 3 , 64.Xr sysctl 8 . 65.Sh BUGS 6632 bits for the identifier is too small. 67.Sh HISTORY 68The 69.Fn gethostid 70and 71.Fn sethostid 72syscalls appeared in 73.Bx 4.2 74and were dropped in 75.Bx 4.4 . 76