MOUNT_KERNFS(8)

NAME
mount_kernfs - mount the /kern file system

SYNOPSIS
mount_kernfs [-o options] /kern mount_point

DESCRIPTION
The mount_kern command attaches an instance of the kernel parameter namespace to the global filesystem namespace. The conventional mount point is /kern. 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.
pagesize
    the machine pagesize (decimal ASCII).
physmem
    the number of pages of physical memory in the machine (decimal ASCII).
root
    the system root directory. In a chroot'ed environment, mount_kernfs can be used to create a new /kern mount point. /kern/root will then refer to the system global root, not the current process root.
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), mount(8)

CAVEATS
This filesystem may not be NFS-exported.

HISTORY
The mount_kernfs utility first appeared in 4.4BSD.