1.\" 2.\" Copyright (c) 1992, 1993, 1994 3.\" The Regents of the University of California. All rights reserved. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software donated to Berkeley by 7.\" Jan-Simon Pendry. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. All advertising materials mentioning features or use of this software 18.\" must display the following acknowledgement: 19.\" This product includes software developed by the University of 20.\" California, Berkeley and its contributors. 21.\" 4. Neither the name of the University nor the names of its contributors 22.\" may be used to endorse or promote products derived from this software 23.\" without specific prior written permission. 24.\" 25.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35.\" SUCH DAMAGE. 36.\" 37.\" from: @(#)mount_kernfs.8 8.2 (Berkeley) 3/27/94 38.\" $Id: mount_kernfs.8,v 1.5 1994/07/25 08:23:29 mycroft Exp $ 39.\" 40.Dd March 27, 1994 41.Dt MOUNT_KERNFS 8 42.Os BSD 4.4 43.Sh NAME 44.Nm mount_kernfs 45.Nd mount the /kern file system 46.Sh SYNOPSIS 47.Nm mount_kernfs 48.Op Fl o Ar options 49.Ar /kern 50.Ar mount_point 51.Sh DESCRIPTION 52The 53.Nm mount_kern 54command attaches an instance of the kernel parameter 55namespace to the global filesystem namespace. 56The conventional mount point is 57.Pa /kern . 58This command is normally executed by 59.Xr mount 8 60at boot time. 61.Pp 62The filesystem includes several regular files which can be read, 63some of which can also be written. 64The contents of the files is in a machine-independent format, 65either a string, or an integer in decimal ASCII. 66Where numbers are returned, a trailing newline character is also added. 67.Pp 68The options are as follows: 69.Bl -tag -width indent 70.It Fl o 71Options are specified with a 72.Fl o 73flag followed by a comma separated string of options. 74See the 75.Xr mount 8 76man page for possible options and their meanings. 77.El 78.Sh FILES 79.Bl -tag -width copyright -compact 80.It Pa boottime 81the time at which the system was last booted (decimal ASCII). 82.It Pa copyright 83kernel copyright message. 84.It Pa hostname 85the hostname, with a trailing newline. 86The hostname can be changed by writing to this file. 87A trailing newline will be stripped from the hostname being written. 88.It Pa hz 89the frequency of the system clock (decimal ASCII). 90.It Pa loadavg 91the 1, 5 and 15 minute load average in kernel fixed-point format. 92The final integer is the fix-point scaling factor. 93All numbers are in decimal ASCII. 94.It Pa msgbuf 95the kernel message buffer, also read by 96.Xr syslogd 8 , 97through the 98.Pa log 99device, and by 100.Xr dmesg 8 . 101.It Pa pagesize 102the machine pagesize (decimal ASCII). 103.It Pa physmem 104the number of pages of physical memory in the machine (decimal ASCII). 105.\" .It Pa root 106.\" the system root directory. 107.\" In a chroot'ed environment, 108.\" .Nm 109.\" can be used to create a new 110.\" .Pa /kern 111.\" mount point. 112.\" .Pa /kern/root 113.\" will then refer to the system global root, not the current process root. 114.It Pa rootdev 115the root device. 116.It Pa rrootdev 117the raw root device. 118.It Pa time 119the second and microsecond value of the system clock. 120Both numbers are in decimal ASCII. 121.It Pa version 122the kernel version string. 123The head line for 124.Pa /etc/motd 125can be generated by running: 126.Dq Ic "sed 1q /kern/version" 127.El 128.Sh SEE ALSO 129.Xr mount 2 , 130.Xr unmount 2 , 131.Xr fstab 5 , 132.Xr dmesg 8 , 133.Xr mount 8 , 134.Xr syslogd 8 135.Sh CAVEATS 136This filesystem may not be NFS-exported. 137.Sh HISTORY 138The 139.Nm mount_kernfs 140utility first appeared in 4.4BSD. 141