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133 lines
4.3 KiB
Groff
133 lines
4.3 KiB
Groff
.\"
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.\" Copyright (c) 1992, 1993, 1994
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.\" The Regents of the University of California. All rights reserved.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software donated to Berkeley by
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.\" Jan-Simon Pendry.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)mount_kernfs.8 8.2 (Berkeley) 3/27/94
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.\"
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.\"
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.Dd March 27, 1994
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.Dt MOUNT_KERNFS 8
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.Os BSD 4.4
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.Sh NAME
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.Nm mount_kernfs
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.Nd mount the /kern file system
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.Sh SYNOPSIS
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.Nm mount_kernfs
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.Op Fl o Ar options
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.Ar /kern
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.Ar mount_point
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.Sh DESCRIPTION
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The
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.Nm mount_kern
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command attaches an instance of the kernel parameter
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namespace to the global filesystem namespace.
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The conventional mount point is
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.Pa /kern .
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This command is normally executed by
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.Xr mount 8
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at boot time.
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.Pp
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The filesystem includes several regular files which can be read,
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some of which can also be written.
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The contents of the files is in a machine-independent format,
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either a string, or an integer in decimal ASCII.
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Where numbers are returned, a trailing newline character is also added.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl o
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Options are specified with a
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.Fl o
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flag followed by a comma separated string of options.
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See the
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.Xr mount 8
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man page for possible options and their meanings.
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.El
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.Sh FILES
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.Bl -tag -width copyright -compact
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.It Pa boottime
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the time at which the system was last booted (decimal ASCII).
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.It Pa copyright
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kernel copyright message.
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.It Pa hostname
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the hostname, with a trailing newline.
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The hostname can be changed by writing to this file.
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A trailing newline will be stripped from the hostname being written.
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.It Pa hz
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the frequency of the system clock (decimal ASCII).
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.It Pa loadavg
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the 1, 5 and 15 minute load average in kernel fixed-point format.
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The final integer is the fix-point scaling factor.
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All numbers are in decimal ASCII.
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.It Pa pagesize
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the machine pagesize (decimal ASCII).
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.It Pa physmem
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the number of pages of physical memory in the machine (decimal ASCII).
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.It Pa root
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the system root directory.
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In a chroot'ed environment,
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.Nm
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can be used to create a new
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.Pa /kern
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mount point.
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.Pa /kern/root
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will then refer to the system global root, not the current process root.
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.It Pa rootdev
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the root device.
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.It Pa rrootdev
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the raw root device.
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.It Pa time
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the second and microsecond value of the system clock.
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Both numbers are in decimal ASCII.
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.It Pa version
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the kernel version string.
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The head line for
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.Pa /etc/motd
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can be generated by running:
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.Dq Ic "sed 1q /kern/version"
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.El
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.Sh SEE ALSO
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.Xr mount 2 ,
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.Xr unmount 2 ,
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.Xr fstab 5 ,
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.Xr mount 8
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.Sh CAVEATS
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This filesystem may not be NFS-exported.
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.Sh HISTORY
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The
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.Nm mount_kernfs
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utility first appeared in
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.Bx 4.4 .
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