MirBSD manpage: mount_kernfs(8)

MOUNT_KERNFS(8)          BSD System Manager's Manual           MOUNT_KERNFS(8)

NAME

     mount_kernfs - mount the /kern filesystem

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. This command is invoked by mount(8) when using the syntax

         mount [options] -t kernfs /kern mount_point

     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 are 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
             Options are specified with a -o flag followed by a comma separat-
             ed string of options. See the mount(8) man page for possible op-
             tions and their meanings.

     Statistics reported by df(1) on the /kern filesystem will indicate the
     amount of unwired/physical memory instead of 'disk space', and the number
     of vnodes used/allocated instead of 'inodes'. The filesystem's block size
     is the system's page size.

FILES

     boottime    Time at which the system was last booted (decimal ASCII).
     byteorder   _BYTE_ORDER for this kernel.
     copyright   Kernel copyright message.
     domainname  The domainname, with a trailing newline. Behaves like a host-
                 name.
     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          Frequency of the system clock (decimal ASCII).
     ipsec       The currently configured IPsec Security Associations.
     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.
     machine     Architecture this kernel was compiled for.
     model       Model of the processor this machine is running on.
     msgbuf      Kernel message buffer, also read by syslogd(8), through the
                 log device, and by dmesg(8).
     ncpu        Number of CPUs in this machine.
     osrelease   OS release number.
     osrev       OS revision number (BSD from <sys/param.h>).
     ostype      OS type for this kernel ("OpenBSD").
     pagesize    Machine pagesize (decimal ASCII).
     physmem     Number of pages of physical memory in the machine (decimal
                 ASCII).
     posix       _POSIX_VERSION for this kernel.
     rootdev     Root device.
     rrootdev    Raw root device.
     time        Second and microsecond value of the system clock. Both
                 numbers are in decimal ASCII.
     usermem     Number of pages of physical memory available for user
                 processes.
     version     Kernel version string. The head line for /etc/motd can be
                 generated by running: "sed 1q /kern/version".

SEE ALSO

     mount(2), fstab(5), dmesg(8), mount(8), syslogd(8), umount(8)

HISTORY

     The mount_kernfs utility first appeared in 4.4BSD.

CAVEATS

     This filesystem may not be NFS-exported.

     Due to non-atomic operations and the potential for race conditions, pro-
     grams should not depend on information obtained from this filesystem.

MirBSD #10-current              March 27, 1994                               1