source: drbl_ui/backup/test_busybox/busybox-1.7.2/util-linux/Config.in @ 158

#
# For a description of the syntax of this configuration file,
# see scripts/kbuild/config-language.txt.
#

menu "Linux System Utilities"

config DMESG
  bool "dmesg"
  default n
  help
    dmesg is used to examine or control the kernel ring buffer.  When the
    Linux kernel prints messages to the system log, they are stored in
    the kernel ring buffer.  You can use dmesg to print the kernel's ring
    buffer, clear the kernel ring buffer, change the size of the kernel
    ring buffer, and change the priority level at which kernel messages
    are also logged to the system console.  Enable this option if you
    wish to enable the 'dmesg' utility.

config FEATURE_DMESG_PRETTY
  bool "pretty dmesg output"
  default y
  depends on DMESG
  help
    If you wish to scrub the syslog level from the output, say 'Y' here.
    The syslog level is a string prefixed to every line with the form "<#>".

    With this option you will see:
      # dmesg
      Linux version 2.6.17.4 .....
      BIOS-provided physical RAM map:
       BIOS-e820: 0000000000000000 - 000000000009f000 (usable)

    Without this option you will see:
      # dmesg
      <5>Linux version 2.6.17.4 .....
      <6>BIOS-provided physical RAM map:
      <6> BIOS-e820: 0000000000000000 - 000000000009f000 (usable)

config FBSET
  bool "fbset"
  default n
  help
    fbset is used to show or change the settings of a Linux frame buffer
    device.  The frame buffer device provides a simple and unique
    interface to access a graphics display.  Enable this option
    if you wish to enable the 'fbset' utility.

config FEATURE_FBSET_FANCY
  bool "Turn on extra fbset options"
  default n
  depends on FBSET
  help
    This option enables extended fbset options, allowing one to set the
    framebuffer size, color depth, etc.  interface to access a graphics
    display.  Enable this option if you wish to enable extended fbset
    options.

config FEATURE_FBSET_READMODE
  bool "Turn on fbset readmode support"
  default n
  depends on FBSET
  help
    This option allows fbset to read the video mode database stored by
    default as /etc/fb.modes, which can be used to set frame buffer
    device to pre-defined video modes.

config FDFLUSH
  bool "fdflush"
  default n
  help
    fdflush is only needed when changing media on slightly-broken
    removable media drives.  It is used to make Linux believe that a
    hardware disk-change switch has been actuated, which causes Linux to
    forget anything it has cached from the previous media.  If you have
    such a slightly-broken drive, you will need to run fdflush every time
    you change a disk.  Most people have working hardware and can safely
    leave this disabled.

config FDFORMAT
  bool "fdformat"
  default n
  help
    fdformat is used to low-level format a floppy disk.

config FDISK
  bool "fdisk"
  default n
  help
    The fdisk utility is used to divide hard disks into one or more
    logical disks, which are generally called partitions.  This utility
    can be used to list and edit the set of partitions or BSD style
    'disk slices' that are defined on a hard drive.

config FDISK_SUPPORT_LARGE_DISKS
  bool "support over 4GB disks"
  default y
  depends on FDISK
  help
    Enable this option to support large disks > 4GB.

config FEATURE_FDISK_WRITABLE
  bool "Write support"
  default y
  depends on FDISK
  help
    Enabling this option allows you to create or change a partition table
    and write those changes out to disk.  If you leave this option
    disabled, you will only be able to view the partition table.

config FEATURE_AIX_LABEL
  bool "Support AIX disklabels"
  default n
  depends on FDISK && FEATURE_FDISK_WRITABLE
  help
    Enabling this option allows you to create or change AIX disklabels.
    Most people can safely leave this option disabled.

config FEATURE_SGI_LABEL
  bool "Support SGI disklabels"
  default n
  depends on FDISK && FEATURE_FDISK_WRITABLE
  help
    Enabling this option allows you to create or change SGI disklabels.
    Most people can safely leave this option disabled.

config FEATURE_SUN_LABEL
  bool "Support SUN disklabels"
  default n
  depends on FDISK && FEATURE_FDISK_WRITABLE
  help
    Enabling this option allows you to create or change SUN disklabels.
    Most people can safely leave this option disabled.

config FEATURE_OSF_LABEL
  bool "Support BSD disklabels"
  default n
  depends on FDISK && FEATURE_FDISK_WRITABLE
  help
    Enabling this option allows you to create or change BSD disklabels
    and define and edit BSD disk slices.

config FEATURE_FDISK_ADVANCED
  bool "Support expert mode"
  default n
  depends on FDISK && FEATURE_FDISK_WRITABLE
  help
    Enabling this option allows you to do terribly unsafe things like
    define arbitrary drive geometry, move the beginning of data in a
    partition, and similarly evil things.  Unless you have a very good
    reason you would be wise to leave this disabled.

config FREERAMDISK
  bool "freeramdisk"
  default n
  help
    Linux allows you to create ramdisks.  This utility allows you to
    delete them and completely free all memory that was used for the
    ramdisk.  For example, if you boot Linux into a ramdisk and later
    pivot_root, you may want to free the memory that is allocated to the
    ramdisk.  If you have no use for freeing memory from a ramdisk, leave
    this disabled.

config FSCK_MINIX
  bool "fsck_minix"
  default n
  help
    The minix filesystem is a nice, small, compact, read-write filesystem
    with little overhead.  It is not a journaling filesystem however and
    can experience corruption if it is not properly unmounted or if the
    power goes off in the middle of a write.  This utility allows you to
    check for and attempt to repair any corruption that occurs to a minix
    filesystem.

config MKFS_MINIX
  bool "mkfs_minix"
  default n
  help
    The minix filesystem is a nice, small, compact, read-write filesystem
    with little overhead.  If you wish to be able to create minix filesystems
    this utility will do the job for you.

comment "Minix filesystem support"
  depends on FSCK_MINIX || MKFS_MINIX

config FEATURE_MINIX2
  bool "Support Minix fs v2 (fsck_minix/mkfs_minix)"
  default y
  depends on FSCK_MINIX || MKFS_MINIX
  help
    If you wish to be able to create version 2 minix filesystems, enable this.
    If you enabled 'mkfs_minix' then you almost certainly want to be using the
    version 2 filesystem support.

config GETOPT
  bool "getopt"
  default n
  help
    The getopt utility is used to break up (parse) options in command
    lines to make it easy to write complex shell scripts that also check
    for legal (and illegal) options.  If you want to write horribly
    complex shell scripts, or use some horribly complex shell script
    written by others, this utility may be for you.  Most people will
    wisely leave this disabled.

config HEXDUMP
  bool "hexdump"
  default n
  help
    The hexdump utility is used to display binary data in a readable
    way that is comparable to the output from most hex editors.

config HWCLOCK
  bool "hwclock"
  default n
  help
    The hwclock utility is used to read and set the hardware clock
    on a system.  This is primarily used to set the current time on
    shutdown in the hardware clock, so the hardware will keep the
    correct time when Linux is _not_ running.

config FEATURE_HWCLOCK_LONG_OPTIONS
  bool "Support long options (--hctosys,...)"
  default n
  depends on HWCLOCK && GETOPT_LONG
  help
    By default, the hwclock utility only uses short options.  If you
    are overly fond of its long options, such as --hctosys, --utc, etc)
    then enable this option.

config FEATURE_HWCLOCK_ADJTIME_FHS
  bool "Use FHS /var/lib/hwclock/adjtime"
  default y
  depends on HWCLOCK
  help
    Starting with FHS 2.3, the adjtime state file is supposed to exist
    at /var/lib/hwclock/adjtime instead of /etc/adjtime.  If you wish
    to use the FHS behavior, answer Y here, otherwise answer N for the
    classic /etc/adjtime path.

    http://www.pathname.com/fhs/pub/fhs-2.3.html#VARLIBHWCLOCKSTATEDIRECTORYFORHWCLO

config IPCRM
  bool "ipcrm"
  default n
  select FEATURE_SUID
  help
    The ipcrm utility allows the removal of System V interprocess
    communication (IPC) objects and the associated data structures
    from the system.

config IPCS
  bool "ipcs"
  default n
  select FEATURE_SUID
  help
    The ipcs utility is used to provide information on the currently
    allocated System V interprocess (IPC) objects in the system.

config LOSETUP
  bool "losetup"
  default n
  help
    losetup is used to associate or detach a loop device with a regular
    file or block device, and to query the status of a loop device.  This
    version does not currently support enabling data encryption.

config MDEV
  bool "mdev"
  default n
  help
    mdev is a mini-udev implementation for dynamically creating device
    nodes in the /dev directory.

    For more information, please see docs/mdev.txt

config FEATURE_MDEV_CONF
  bool "Support /etc/mdev.conf"
  default n
  depends on MDEV
  help
    Add support for the mdev config file to control ownership and
    permissions of the device nodes.

    For more information, please see docs/mdev.txt

config FEATURE_MDEV_EXEC
  bool "Support command execution at device addition/removal"
  default n
  depends on FEATURE_MDEV_CONF
  help
    This adds support for an optional field to /etc/mdev.conf for
    executing commands when devices are created/removed.

    For more information, please see docs/mdev.txt

config FEATURE_MDEV_LOAD_FIRMWARE
  bool "Support loading of firmwares"
  default n
  depends on MDEV
  help
    Some devices need to load firmware before they can be usable.

    These devices will request userspace look up the files in
    /lib/firmware/ and if it exists, send it to the kernel for
    loading into the hardware.

config MKSWAP
  bool "mkswap"
  default n
  help
    The mkswap utility is used to configure a file or disk partition as
    Linux swap space.  This allows Linux to use the entire file or
    partition as if it were additional RAM, which can greatly increase
    the capability of low-memory machines.  This additional memory is
    much slower than real RAM, but can be very helpful at preventing your
    applications being killed by the Linux out of memory (OOM) killer.
    Once you have created swap space using 'mkswap' you need to enable
    the swap space using the 'swapon' utility.

config FEATURE_MKSWAP_V0
  bool "version 0 support"
  default n
  depends on MKSWAP
# depends on MKSWAP && DEPRECATED
  help
    Enable support for the old v0 style.
    If your kernel is older than 2.1.117, then v0 support is the
    only option.

config MORE
  bool "more"
  default n
  help
    more is a simple utility which allows you to read text one screen
    sized page at a time.  If you want to read text that is larger than
    the screen, and you are using anything faster than a 300 baud modem,
    you will probably find this utility very helpful.  If you don't have
    any need to reading text files, you can leave this disabled.

config FEATURE_USE_TERMIOS
  bool "Use termios to manipulate the screen"
  default y
  depends on MORE
  help
    This option allows utilities such as 'more' and 'top' to determine
    the size of the screen.  If you leave this disabled, your utilities
    that display things on the screen will be especially primitive and
    will be unable to determine the current screen size, and will be
    unable to move the cursor.

config MOUNT
  bool "mount"
  default n
  help
    All files and filesystems in Unix are arranged into one big directory
    tree.  The 'mount' utility is used to graft a filesystem onto a
    particular part of the tree.  A filesystem can either live on a block
    device, or it can be accessible over the network, as is the case with
    NFS filesystems.  Most people using BusyBox will also want to enable
    the 'mount' utility.

config FEATURE_MOUNT_NFS
  bool "Support mounting NFS file systems"
  default n
  depends on MOUNT
  select FEATURE_HAVE_RPC
  select FEATURE_SYSLOG
  help
    Enable mounting of NFS file systems.

config FEATURE_MOUNT_CIFS
  bool "Support mounting CIFS/SMB file systems"
  default n
  depends on MOUNT
  help
    Enable support for samba mounts.

config FEATURE_MOUNT_FLAGS
  depends on MOUNT
  bool "Support lots of -o flags in mount"
  default y
  help
    Without this, mount only supports ro/rw/remount.  With this, it
    supports nosuid, suid, dev, nodev, exec, noexec, sync, async, atime,
    noatime, diratime, nodiratime, loud, bind, move, shared, slave,
    private, unbindable, rshared, rslave, rprivate, and runbindable.

config FEATURE_MOUNT_FSTAB
  depends on MOUNT
  bool "Support /etc/fstab and -a"
  default y
  help
    Support mount all and looking for files in /etc/fstab.

config PIVOT_ROOT
  bool "pivot_root"
  default n
  help
    The pivot_root utility swaps the mount points for the root filesystem
    with some other mounted filesystem.  This allows you to do all sorts
    of wild and crazy things with your Linux system and is far more
    powerful than 'chroot'.

    Note: This is for initrd in linux 2.4.  Under initramfs (introduced
    in linux 2.6) use switch_root instead.

config RDATE
  bool "rdate"
  default n
  help
    The rdate utility allows you to synchronize the date and time of your
    system clock with the date and time of a remote networked system using
    the RFC868 protocol, which is built into the inetd daemon on most
    systems.

config READPROFILE
  bool "readprofile"
  default n
  help
    This allows you to parse /proc/profile for basic profiling.

config SETARCH
  bool "setarch"
  default n
  help
    The linux32 utility is used to create a 32bit environment for the
    specified program (usually a shell).  It only makes sense to have
    this util on a system that supports both 64bit and 32bit userland
    (like amd64/x86, ppc64/ppc, sparc64/sparc, etc...).

config SWAPONOFF
  bool "swaponoff"
  default n
  help
    This option enables both the 'swapon' and the 'swapoff' utilities.
    Once you have created some swap space using 'mkswap', you also need
    to enable your swap space with the 'swapon' utility.  The 'swapoff'
    utility is used, typically at system shutdown, to disable any swap
    space.  If you are not using any swap space, you can leave this
    option disabled.

config SWITCH_ROOT
  bool "switch_root"
  default n
  help
    The switch_root utility is used from initramfs to select a new
    root device.  Under initramfs, you have to use this instead of
    pivot_root.  (Stop reading here if you don't care why.)

    Booting with initramfs extracts a gzipped cpio archive into rootfs
    (which is a variant of ramfs/tmpfs).  Because rootfs can't be moved
    or unmounted*, pivot_root will not work from initramfs.  Instead,
    switch_root deletes everything out of rootfs (including itself),
    does a mount --move that overmounts rootfs with the new root, and
    then execs the specified init program.

    * Because the Linux kernel uses rootfs internally as the starting
    and ending point for searching through the kernel's doubly linked
    list of active mount points.  That's why.

config UMOUNT
  bool "umount"
  default n
  help
    When you want to remove a mounted filesystem from its current mount point,
    for example when you are shutting down the system, the 'umount' utility is
    the tool to use.  If you enabled the 'mount' utility, you almost certainly
    also want to enable 'umount'.

config FEATURE_UMOUNT_ALL
  bool "umount -a option"
  default n
  depends on UMOUNT
  help
    Support -a option to unmount all currently mounted filesystems.

comment "Common options for mount/umount"
  depends on MOUNT || UMOUNT

config FEATURE_MOUNT_LOOP
  bool "Support loopback mounts"
  default n
  depends on MOUNT || UMOUNT
  help
    Enabling this feature allows automatic mounting of files (containing
    filesystem images) via the linux kernel's loopback devices.  The mount
    command will detect you are trying to mount a file instead of a block
    device, and transparently associate the file with a loopback device.
    The umount command will also free that loopback device.

    You can still use the 'losetup' utility (to manually associate files
    with loop devices) if you need to do something advanced, such as
    specify an offset or cryptographic options to the loopback device.
    (If you don't want umount to free the loop device, use "umount -D".)

config FEATURE_MTAB_SUPPORT
  bool "Support for the old /etc/mtab file"
  default n
  depends on MOUNT || UMOUNT
  help
    Historically, Unix systems kept track of the currently mounted
    partitions in the file "/etc/mtab".  These days, the kernel exports
    the list of currently mounted partitions in "/proc/mounts", rendering
    the old mtab file obsolete.  (In modern systems, /etc/mtab should be
    a symlink to /proc/mounts.)

    The only reason to have mount maintain an /etc/mtab file itself is if
    your stripped-down embedded system does not have a /proc directory.
    If you must use this, keep in mind it's inherently brittle (for
    example a mount under chroot won't update it), can't handle modern
    features like separate per-process filesystem namespaces, requires
    that your /etc directory be writeable, tends to get easily confused
    by --bind or --move mounts, won't update if you rename a directory
    that contains a mount point, and so on.  (In brief: avoid.)

    About the only reason to use this is if you've removed /proc from
    your kernel.

endmenu