128 lines
4.2 KiB
Groff
128 lines
4.2 KiB
Groff
.\" Copyright (c) 1996
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.\" Mike Pritchard <mpp@FreeBSD.org>. All rights reserved.
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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 Mike Pritchard.
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.\" 4. Neither the name of author 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 AUTHOR 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 AUTHOR 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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.\" $Id$
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.\"
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.Dd December 14, 1996
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.Dt kernfs 5
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.Os BSD 4.4
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.Sh NAME
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.Nm kernfs
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.Nd kernel file system
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.Sh SYNOPSIS
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.Bd -literal
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kern /kern kernfs rw 0 0
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.Ed
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.Sh DESCRIPTION
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The kernel file system, or
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.Nm kernfs ,
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provides access to information on the currently running kernel.
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It is normally mounted on
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.Pa /kern .
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The file system includes several regular file which can be
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read, and some of which can also be written.
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The contents of the files in in a machine-independent format,
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either a string, or and integer in decial ASCII. A trailing
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newline character is added when a number is returned.
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.Pp
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The mount point contains the following files:
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.Bl -tag -width copyright
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.It Pa bootfile
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The path from which the current kernel was booted.
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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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The kernel copyright message.
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.It Pa hostname
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The current hostname, with a trailing newline. The
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current hostname can be changed by writing to this file.
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A trailing newline will be stripped from the hostname being
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wirtten.
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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 averages in kernel fixed-point
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format. 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. In a chroot'ed environment,
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.Xr mount_kernfs 8
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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
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process root. Not currently enabled..
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.It Pa rootdev
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The root device. Not currently enabled.
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.It Pa rrootdev
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The raw root device. Not currently enabled.
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.It Pa time
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The second and microsecond values of the system clock (decimal ASCII).
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.It Pa version
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The kernel version string. 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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.Pp
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Most of the information provided by the
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.Nm
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is also available from
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.Xr sysctl 8 .
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.Sh FILES
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.Bl -tag -width /kern/XXXXXXX
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.It Pa /kern
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normal mount point for the
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.Nm kernfs .
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.El
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.Sh SEE ALSO
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.Xr sysctl 3 ,
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.Xr mount_kernfs 8 ,
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.Xr sysctl 8
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.Sh HISTORY
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The
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.Nm
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first appeared in
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.Bx 4.4 .
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The
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.Nm
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manual page first appeared in
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.Fx 2.2 .
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.Sh AUTHOR
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This manual page was written by Mike Pritchard <mpp@FreeBSD.org>,
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and was adapted from the
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.Xr mount_kernfs 8
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manual page written by Jan-Simon Pendry.
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