1.\" Copyright (c) 1983, 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)gethostid.3 6.7 (Berkeley) 04/04/93 7.\" 8.Dd 9.Dt GETHOSTID 3 10.Os BSD 4.2 11.Sh NAME 12.Nm gethostid , 13.Nm sethostid 14.Nd get/set unique identifier of current host 15.Sh SYNOPSIS 16.Fd #include <unistd.h> 17.Ft long 18.Fn gethostid void 19.Ft int 20.Fn sethostid "long hostid" 21.Sh DESCRIPTION 22.Fn Sethostid 23establishes a 32-bit identifier for the 24current processor that is intended to be unique among all 25UNIX systems in existence. This is normally a DARPA Internet 26address for the local machine. This call is allowed only to the 27super-user and is normally performed at boot time. 28.Pp 29.Fn Gethostid 30returns the 32-bit identifier for the current processor. 31.Pp 32This function has been deprecated. 33The hostid should be set or retrieved by use of 34.Xr sysctl 2 . 35.Sh SEE ALSO 36.Xr sysctl 2 , 37.Xr gethostname 3 , 38.Xr sysctl 8 . 39.Sh BUGS 4032 bits for the identifier is too small. 41.Sh HISTORY 42The 43.Fn gethostid 44and 45.Fn sethostid 46syscalls appeared in 47.Bx 4.2 48and were dropped in 49.Bx 4.4 . 50