1.\" 2.\" Copyright (c) 2009 3.\" The DragonFly Project. All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in 13.\" the documentation and/or other materials provided with the 14.\" distribution. 15.\" 3. Neither the name of The DragonFly Project nor the names of its 16.\" contributors may be used to endorse or promote products derived 17.\" from this software without specific, prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 22.\" FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 23.\" COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 24.\" INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 25.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 26.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 27.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 28.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 29.\" OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.Dd December 4, 2019 33.Dt MOUNT_DEVFS 8 34.Os 35.Sh NAME 36.Nm mount_devfs 37.Nd mount a device file system 38.Sh SYNOPSIS 39.Nm 40.Op Fl o Ar options 41.Ar node 42.Sh DESCRIPTION 43The 44.Nm 45command attaches an instance of the device file system (or 46.Xr devfs 5 ) 47to the global file system namespace. 48This command is automatically executed for 49.Pa /dev 50at boot time. 51.Pp 52The options are as follows: 53.Bl -tag -width indent 54.It Fl o 55Specify mount options, which are a comma delimited set of options (see 56.Xr mount 8 ) . 57Supported mount options are: 58.Bl -tag -width indent 59.It Ar jail 60Mount 61.Xr devfs 5 62for a jail. 63Only rules between 64.Ic jail Ar yes 65and 66.Ic jail Ar no 67are applied. 68.It Ar ruleset=rule_file 69When mounting, apply the rules from the specified 70.Ar rule_file , 71which can be either an absolute path or one relative to 72.Pa /etc/devfs/ . 73.El 74.El 75.Pp 76Mounting an already mounted 77.Ar node 78clears and resets all rules that are in effect for it and (if a 79.Ar ruleset 80option is present) applies the rules from 81.Ar rule_file . 82It is equal to 83.Nm devfsctl Fl cr 84followed by an optional 85.Nm devfsctl Fl af . 86.Sh EXAMPLES 87Mount a 88.Xr devfs 5 , 89marked as 90.Ar jail , 91with a ruleset file named 92.Pa default.rules 93onto 94.Pa /var/jail/dev . 95.Bd -literal -offset indent 96mount_devfs -o jail,ruleset=default.rules /var/jail/dev 97.Ed 98.Pp 99A corresponding 100.Xr fstab 5 101entry is: 102.Bd -literal -offset indent 103devfs /var/jail/dev devfs ro,jail,ruleset=default.rules 104.Ed 105.Sh SEE ALSO 106.Xr mount 2 , 107.Xr unmount 2 , 108.Xr devfs 5 , 109.Xr fstab 5 , 110.Xr devfsctl 8 , 111.Xr mount 8 112.Sh HISTORY 113The 114.Nm 115utility first appeared in 116.Dx 2.3 . 117