1.\" Copyright (c) 1996 2.\" Mike Pritchard <mpp@FreeBSD.org>. All rights reserved. 3.\" 4.\" Copyright (c) 1992, 1993, 1994 5.\" The Regents of the University of California. All rights reserved. 6.\" All rights reserved. 7.\" 8.\" This code is derived from software donated to Berkeley by 9.\" Jan-Simon Pendry. 10.\" 11.\" Redistribution and use in source and binary forms, with or without 12.\" modification, are permitted provided that the following conditions 13.\" are met: 14.\" 1. Redistributions of source code must retain the above copyright 15.\" notice, this list of conditions and the following disclaimer. 16.\" 2. Redistributions in binary form must reproduce the above copyright 17.\" notice, this list of conditions and the following disclaimer in the 18.\" documentation and/or other materials provided with the distribution. 19.\" 3. Neither the name of the University nor the names of its contributors 20.\" may be used to endorse or promote products derived from this software 21.\" without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33.\" SUCH DAMAGE. 34.\" 35.\" $FreeBSD: src/share/man/man5/devfs.5,v 1.19 2006/09/18 15:24:19 ru Exp $ 36.\" 37.Dd February 17, 2018 38.Dt DEVFS 5 39.Os 40.Sh NAME 41.Nm devfs 42.Nd device file system 43.\".Sh SYNOPSIS 44.\".Bd -literal 45.\"devfs /dev devfs rw 0 0 46.\".Ed 47.Sh DESCRIPTION 48The device file system, or 49.Nm , 50provides access to kernel's device 51namespace in the global file system namespace. 52It is mounted automatically on 53.Pa /dev . 54.Pp 55The file system includes several directories, links, symbolic links 56and devices, some of which can also be written. 57In a chroot'ed 58environment, 59.Nm 60can be used to create a new 61.Pa /dev 62mount point. 63.Sh SYSCTL VARIABLES 64.Bl -hang -width ".Va vfs.devfs.debug" 65.It Va vfs.devfs.debug 66Enables 67.Nm 68debugging. 69.El 70.Sh FILES 71.Bl -tag -width /dev/XXXX -compact 72.It Pa /dev 73The normal 74.Nm 75mount point. 76.El 77.\".Sh EXAMPLES 78.\"To mount a 79.\".Nm 80.\"volume located on 81.\".Pa /dev : 82.\".Pp 83.\".Dl "mount -t devfs devfs /dev" 84.Sh SEE ALSO 85.Xr devfsctl 8 86.\".Xr mount 8 87.Sh HISTORY 88The 89.Nm 90file system first appeared in 91.Dx 2.3 . 92.Sh AUTHORS 93.An Alex Hornung 94