MOUNT_KERNFS(8) BSD System Manager's Manual 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 sepa‐
rated 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 for‐
mat. 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 ALSOmount(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.
4.4BSD March 27, 1994 4.4BSD
