NAME
mount_kernfs —
mount the /kern file
system
SYNOPSIS
mount_kernfs |
[-o
options] /kern
mount_point |
DESCRIPTION
The
mount_kernfs command attaches an instance of the kernel
parameter namespace to the global filesystem namespace. The conventional mount
point is
/kern. The directory specified by
mount_point is converted to an absolute path before use.
This command is normally executed by
mount(8) at boot time.
The filesystem includes several regular files which can be read, some of which
can also be written. The contents of the files is in a machine-independent
format, either a string, or an integer in decimal ASCII. Where numbers are
returned, a trailing newline character is also added.
The options are as follows:
-
-
- -o
- Options are specified with a -o flag
followed by a comma separated string of options. See the
mount(8) man page for
possible options and their meanings.
FILES
- boottime
- the time at which the system was last booted (decimal
ASCII).
- copyright
- kernel copyright message.
- hostname
- the hostname, with a trailing newline. The hostname can be
changed by writing to this file. A trailing newline will be stripped from
the hostname being written.
- hz
- the frequency of the system clock (decimal ASCII).
- loadavg
- the 1, 5 and 15 minute load average in kernel fixed-point
format. The final integer is the fix-point scaling factor. All numbers are
in decimal ASCII.
- msgbuf
- the kernel message buffer, also read by
syslogd(8), through the
log device, and by
dmesg(8).
- pagesize
- the machine pagesize (decimal ASCII).
- physmem
- the number of pages of physical memory in the machine
(decimal ASCII).
- rootdev
- the root device.
- rrootdev
- the raw root device.
- time
- the second and microsecond value of the system clock. Both
numbers are in decimal ASCII.
- version
- the kernel version string. The head line for
/etc/motd can be generated by running:
“sed 1q /kern/version”
SEE ALSO
mount(2),
unmount(2),
fstab(5),
dmesg(8),
mount(8),
setkey(8),
syslogd(8)
HISTORY
The
mount_kernfs utility first appeared in
4.4BSD.
BUGS
This filesystem may not be NFS-exported.