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Config.in
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#
# For a description of the syntax of this configuration file,
# see scripts/kbuild/config-language.txt.
#
mainmenu "BusyBox Configuration"
config HAVE_DOT_CONFIG
bool
default y
menu "Busybox Settings"
menu "General Configuration"
config DESKTOP
bool "Enable options for full-blown desktop systems"
default y
help
Enable options and features which are not essential.
Select this only if you plan to use busybox on full-blown
desktop machine with common Linux distro, not on an embedded box.
config EXTRA_COMPAT
bool "Provide compatible behavior for rare corner cases (bigger code)"
default n
help
This option makes grep, sed etc handle rare corner cases
(embedded NUL bytes and such). This makes code bigger and uses
some GNU extensions in libc. You probably only need this option
if you plan to run busybox on desktop.
config INCLUDE_SUSv2
bool "Enable obsolete features removed before SUSv3"
default y
help
This option will enable backwards compatibility with SuSv2,
specifically, old-style numeric options ('command -1 <file>')
will be supported in head, tail, and fold. (Note: should
affect renice too.)
config USE_PORTABLE_CODE
bool "Avoid using GCC-specific code constructs"
default n
help
Use this option if you are trying to compile busybox with
compiler other than gcc.
If you do use gcc, this option may needlessly increase code size.
config PLATFORM_LINUX
bool "Enable Linux-specific applets and features"
default y
help
For the most part, busybox requires only POSIX compatibility
from the target system, but some applets and features use
Linux-specific interfaces.
Answering 'N' here will disable such applets and hide the
corresponding configuration options.
choice
prompt "Buffer allocation policy"
default FEATURE_BUFFERS_USE_MALLOC
help
There are 3 ways BusyBox can handle buffer allocations:
- Use malloc. This costs code size for the call to xmalloc.
- Put them on stack. For some very small machines with limited stack
space, this can be deadly. For most folks, this works just fine.
- Put them in BSS. This works beautifully for computers with a real
MMU (and OS support), but wastes runtime RAM for uCLinux. This
behavior was the only one available for BusyBox versions 0.48 and
earlier.
config FEATURE_BUFFERS_USE_MALLOC
bool "Allocate with Malloc"
config FEATURE_BUFFERS_GO_ON_STACK
bool "Allocate on the Stack"
config FEATURE_BUFFERS_GO_IN_BSS
bool "Allocate in the .bss section"
endchoice
config SHOW_USAGE
bool "Show applet usage messages"
default y
help
Enabling this option, BusyBox applets will show terse help messages
when invoked with wrong arguments.
If you do not want to show any (helpful) usage message when
issuing wrong command syntax, you can say 'N' here,
saving approximately 7k.
config FEATURE_VERBOSE_USAGE
bool "Show verbose applet usage messages"
default y
depends on SHOW_USAGE
help
All BusyBox applets will show verbose help messages when
busybox is invoked with --help. This will add a lot of text to the
busybox binary. In the default configuration, this will add about
13k, but it can add much more depending on your configuration.
config FEATURE_COMPRESS_USAGE
bool "Store applet usage messages in compressed form"
default y
depends on SHOW_USAGE
help
Store usage messages in .bz compressed form, uncompress them
on-the-fly when <applet> --help is called.
If you have a really tiny busybox with few applets enabled (and
bunzip2 isn't one of them), the overhead of the decompressor might
be noticeable. Also, if you run executables directly from ROM
and have very little memory, this might not be a win. Otherwise,
you probably want this.
config FEATURE_INSTALLER
bool "Support --install [-s] to install applet links at runtime"
default y
help
Enable 'busybox --install [-s]' support. This will allow you to use
busybox at runtime to create hard links or symlinks for all the
applets that are compiled into busybox.
config INSTALL_NO_USR
bool "Don't use /usr"
default n
help
Disable use of /usr. busybox --install and "make install"
will install applets only to /bin and /sbin,
never to /usr/bin or /usr/sbin.
config LOCALE_SUPPORT
bool "Enable locale support (system needs locale for this to work)"
default n
help
Enable this if your system has locale support and you would like
busybox to support locale settings.
config UNICODE_SUPPORT
bool "Support Unicode"
default y
help
This makes various applets aware that one byte is not
one character on screen.
Busybox aims to eventually work correctly with Unicode displays.
Any older encodings are not guaranteed to work.
Probably by the time when busybox will be fully Unicode-clean,
other encodings will be mainly of historic interest.
config UNICODE_USING_LOCALE
bool "Use libc routines for Unicode (else uses internal ones)"
default n
depends on UNICODE_SUPPORT && LOCALE_SUPPORT
help
With this option on, Unicode support is implemented using libc
routines. Otherwise, internal implementation is used.
Internal implementation is smaller.
config FEATURE_CHECK_UNICODE_IN_ENV
bool "Check $LANG environment variable"
default n
depends on UNICODE_SUPPORT && !UNICODE_USING_LOCALE
help
With this option on, Unicode support is activated
only if LANG variable has the value of the form "xxxx.utf8"
Otherwise, Unicode support will be always enabled and active.
config SUBST_WCHAR
int "Character code to substitute unprintable characters with"
depends on UNICODE_SUPPORT
default 63
help
Typical values are 63 for '?' (works with any output device),
30 for ASCII substitute control code,
65533 (0xfffd) for Unicode replacement character.
config LAST_SUPPORTED_WCHAR
int "Range of supported Unicode characters"
depends on UNICODE_SUPPORT
default 767
help
Any character with Unicode value bigger than this is assumed
to be non-printable on output device. Many applets replace
such chars with substitution character.
The idea is that many valid printable Unicode chars are
nevertheless are not displayed correctly. Think about
combining charachers, double-wide hieroglyphs, obscure
characters in dozens of ancient scripts...
Many terminals, terminal emulators, xterms etc will fail
to handle them correctly. Choose the smallest value
which suits your needs.
Typical values are:
126 - ASCII only
767 (0x2ff) - there are no combining chars in [0..767] range
(the range includes Latin 1, Latin Ext. A and B),
code is ~700 bytes smaller for this case.
4351 (0x10ff) - there are no double-wide chars in [0..4351] range,
code is ~300 bytes smaller for this case.
12799 (0x31ff) - nearly all non-ideographic characters are
available in [0..12799] range, including
East Asian scripts like katakana, hiragana, hangul,
bopomofo...
0 - off, any valid printable Unicode character will be printed.
config UNICODE_COMBINING_WCHARS
bool "Allow zero-width Unicode characters on output"
default n
depends on UNICODE_SUPPORT
help
With this option off, any Unicode char with width of 0
is substituted on output.
config UNICODE_WIDE_WCHARS
bool "Allow wide Unicode characters on output"
default n
depends on UNICODE_SUPPORT
help
With this option off, any Unicode char with width > 1
is substituted on output.
config UNICODE_BIDI_SUPPORT
bool "Bidirectional character-aware line input"
default n
depends on UNICODE_SUPPORT && !UNICODE_USING_LOCALE
help
With this option on, right-to-left Unicode characters
are treated differently on input (e.g. cursor movement).
config UNICODE_NEUTRAL_TABLE
bool "In bidi input, support non-ASCII neutral chars too"
default n
depends on UNICODE_BIDI_SUPPORT
help
In most cases it's enough to treat only ASCII non-letters
(i.e. punctuation, numbers and space) as characters
with neutral directionality.
With this option on, more extensive (and bigger) table
of neutral chars will be used.
config UNICODE_PRESERVE_BROKEN
bool "Make it possible to enter sequences of chars which are not Unicode"
default n
depends on UNICODE_SUPPORT
help
With this option on, on line-editing input (such as used by shells)
invalid UTF-8 bytes are not substituted with the selected
substitution character.
For example, this means that entering 'l', 's', ' ', 0xff, [Enter]
at shell prompt will list file named 0xff (single char name
with char value 255), not file named '?'.
config LONG_OPTS
bool "Support for --long-options"
default y
help
Enable this if you want busybox applets to use the gnu --long-option
style, in addition to single character -a -b -c style options.
config FEATURE_DEVPTS
bool "Use the devpts filesystem for Unix98 PTYs"
default y
help
Enable if you want BusyBox to use Unix98 PTY support. If enabled,
busybox will use /dev/ptmx for the master side of the pseudoterminal
and /dev/pts/<number> for the slave side. Otherwise, BSD style
/dev/ttyp<number> will be used. To use this option, you should have
devpts mounted.
config FEATURE_CLEAN_UP
bool "Clean up all memory before exiting (usually not needed)"
default n
help
As a size optimization, busybox normally exits without explicitly
freeing dynamically allocated memory or closing files. This saves
space since the OS will clean up for us, but it can confuse debuggers
like valgrind, which report tons of memory and resource leaks.
Don't enable this unless you have a really good reason to clean
things up manually.
config FEATURE_UTMP
bool "Support utmp file"
default y
help
The file /var/run/utmp is used to track who is currently logged in.
With this option on, certain applets (getty, login, telnetd etc)
will create and delete entries there.
"who" applet requires this option.
config FEATURE_WTMP
bool "Support wtmp file"
default y
depends on FEATURE_UTMP
help
The file /var/run/wtmp is used to track when users have logged into
and logged out of the system.
With this option on, certain applets (getty, login, telnetd etc)
will append new entries there.
"last" applet requires this option.
config FEATURE_PIDFILE
bool "Support writing pidfiles"
default y
help
This option makes some applets (e.g. crond, syslogd, inetd) write
a pidfile in /var/run. Some applications rely on them.
config FEATURE_SUID
bool "Support for SUID/SGID handling"
default y
help
With this option you can install the busybox binary belonging
to root with the suid bit set, enabling some applets to perform
root-level operations even when run by ordinary users
(for example, mounting of user mounts in fstab needs this).
Busybox will automatically drop priviledges for applets
that don't need root access.
If you are really paranoid and don't want to do this, build two
busybox binaries with different applets in them (and the appropriate
symlinks pointing to each binary), and only set the suid bit on the
one that needs it.
The applets which require root rights (need suid bit or
to be run by root) and will refuse to execute otherwise:
crontab, login, passwd, su, vlock, wall.
The applets which will use root rights if they have them
(via suid bit, or because run by root), but would try to work
without root right nevertheless:
findfs, ping[6], traceroute[6], mount.
Note that if you DONT select this option, but DO make busybox
suid root, ALL applets will run under root, which is a huge
security hole (think "cp /some/file /etc/passwd").
config FEATURE_SUID_CONFIG
bool "Runtime SUID/SGID configuration via /etc/busybox.conf"
default y
depends on FEATURE_SUID
help
Allow the SUID / SGID state of an applet to be determined at runtime
by checking /etc/busybox.conf. (This is sort of a poor man's sudo.)
The format of this file is as follows:
APPLET = [Ssx-][Ssx-][x-] [USER.GROUP]
s: USER or GROUP is allowed to execute APPLET.
APPLET will run under USER or GROUP
(reagardless of who's running it).
S: USER or GROUP is NOT allowed to execute APPLET.
APPLET will run under USER or GROUP.
This option is not very sensical.
x: USER/GROUP/others are allowed to execute APPLET.
No UID/GID change will be done when it is run.
-: USER/GROUP/others are not allowed to execute APPLET.
An example might help:
[SUID]
su = ssx root.0 # applet su can be run by anyone and runs with
# euid=0/egid=0
su = ssx # exactly the same
mount = sx- root.disk # applet mount can be run by root and members
# of group disk (but not anyone else)
# and runs with euid=0 (egid is not changed)
cp = --- # disable applet cp for everyone
The file has to be owned by user root, group root and has to be
writeable only by root:
(chown 0.0 /etc/busybox.conf; chmod 600 /etc/busybox.conf)
The busybox executable has to be owned by user root, group
root and has to be setuid root for this to work:
(chown 0.0 /bin/busybox; chmod 4755 /bin/busybox)
Robert 'sandman' Griebl has more information here:
<url: http://www.softforge.de/bb/suid.html >.
config FEATURE_SUID_CONFIG_QUIET
bool "Suppress warning message if /etc/busybox.conf is not readable"
default y
depends on FEATURE_SUID_CONFIG
help
/etc/busybox.conf should be readable by the user needing the SUID,
check this option to avoid users to be notified about missing
permissions.
config SELINUX
bool "Support NSA Security Enhanced Linux"
default n
select PLATFORM_LINUX
help
Enable support for SELinux in applets ls, ps, and id. Also provide
the option of compiling in SELinux applets.
If you do not have a complete SELinux userland installed, this stuff
will not compile. Go visit
http://www.nsa.gov/selinux/index.html
to download the necessary stuff to allow busybox to compile with
this option enabled. Specifially, libselinux 1.28 or better is
directly required by busybox. If the installation is located in a
non-standard directory, provide it by invoking make as follows:
CFLAGS=-I<libselinux-include-path> \
LDFLAGS=-L<libselinux-lib-path> \
make
Most people will leave this set to 'N'.
config FEATURE_PREFER_APPLETS
bool "exec prefers applets"
default n
help
This is an experimental option which directs applets about to
call 'exec' to try and find an applicable busybox applet before
searching the PATH. This is typically done by exec'ing
/proc/self/exe.
This may affect shell, find -exec, xargs and similar applets.
They will use applets even if /bin/<applet> -> busybox link
is missing (or is not a link to busybox). However, this causes
problems in chroot jails without mounted /proc and with ps/top
(command name can be shown as 'exe' for applets started this way).
config BUSYBOX_EXEC_PATH
string "Path to BusyBox executable"
default "/proc/self/exe"
help
When Busybox applets need to run other busybox applets, BusyBox
sometimes needs to exec() itself. When the /proc filesystem is
mounted, /proc/self/exe always points to the currently running
executable. If you haven't got /proc, set this to wherever you
want to run BusyBox from.
# These are auto-selected by other options
config FEATURE_SYSLOG
bool #No description makes it a hidden option
default n
#help
# This option is auto-selected when you select any applet which may
# send its output to syslog. You do not need to select it manually.
config FEATURE_HAVE_RPC
bool #No description makes it a hidden option
default n
#help
# This is automatically selected if any of enabled applets need it.
# You do not need to select it manually.
endmenu
menu 'Build Options'
config STATIC
bool "Build BusyBox as a static binary (no shared libs)"
default n
help
If you want to build a static BusyBox binary, which does not
use or require any shared libraries, then enable this option.
This can cause BusyBox to be considerably larger, so you should
leave this option false unless you have a good reason (i.e.
your target platform does not support shared libraries, or
you are building an initrd which doesn't need anything but
BusyBox, etc).
Most people will leave this set to 'N'.
config PIE
bool "Build BusyBox as a position independent executable"
default n
depends on !STATIC
help
Hardened code option. PIE binaries are loaded at a different
address at each invocation. This has some overhead,
particularly on x86-32 which is short on registers.
Most people will leave this set to 'N'.
config NOMMU
bool "Force NOMMU build"
default n
help
Busybox tries to detect whether architecture it is being
built against supports MMU or not. If this detection fails,
or if you want to build NOMMU version of busybox for testing,
you may force NOMMU build here.
Most people will leave this set to 'N'.
# PIE can be made to work with BUILD_LIBBUSYBOX, but currently
# build system does not support that
config BUILD_LIBBUSYBOX
bool "Build shared libbusybox"
default n
depends on !FEATURE_PREFER_APPLETS && !PIE && !STATIC
help
Build a shared library libbusybox.so.N.N.N which contains all
busybox code.
This feature allows every applet to be built as a tiny
separate executable. Enabling it for "one big busybox binary"
approach serves no purpose and increases code size.
You should almost certainly say "no" to this.
### config FEATURE_FULL_LIBBUSYBOX
### bool "Feature-complete libbusybox"
### default n if !FEATURE_SHARED_BUSYBOX
### depends on BUILD_LIBBUSYBOX
### help
### Build a libbusybox with the complete feature-set, disregarding
### the actually selected config.
###
### Normally, libbusybox will only contain the features which are
### used by busybox itself. If you plan to write a separate
### standalone application which uses libbusybox say 'Y'.
###
### Note: libbusybox is GPL, not LGPL, and exports no stable API that
### might act as a copyright barrier. We can and will modify the
### exported function set between releases (even minor version number
### changes), and happily break out-of-tree features.
###
### Say 'N' if in doubt.
config FEATURE_INDIVIDUAL
bool "Produce a binary for each applet, linked against libbusybox"
default y
depends on BUILD_LIBBUSYBOX
help
If your CPU architecture doesn't allow for sharing text/rodata
sections of running binaries, but allows for runtime dynamic
libraries, this option will allow you to reduce memory footprint
when you have many different applets running at once.
If your CPU architecture allows for sharing text/rodata,
having single binary is more optimal.
Each applet will be a tiny program, dynamically linked
against libbusybox.so.N.N.N.
You need to have a working dynamic linker.
config FEATURE_SHARED_BUSYBOX
bool "Produce additional busybox binary linked against libbusybox"
default y
depends on BUILD_LIBBUSYBOX
help
Build busybox, dynamically linked against libbusybox.so.N.N.N.
You need to have a working dynamic linker.
### config BUILD_AT_ONCE
### bool "Compile all sources at once"
### default n
### help
### Normally each source-file is compiled with one invocation of
### the compiler.
### If you set this option, all sources are compiled at once.
### This gives the compiler more opportunities to optimize which can
### result in smaller and/or faster binaries.
###
### Setting this option will consume alot of memory, e.g. if you
### enable all applets with all features, gcc uses more than 300MB
### RAM during compilation of busybox.
###
### This option is most likely only beneficial for newer compilers
### such as gcc-4.1 and above.
###
### Say 'N' unless you know what you are doing.
config LFS
bool "Build with Large File Support (for accessing files > 2 GB)"
default y
help
If you want to build BusyBox with large file support, then enable
this option. This will have no effect if your kernel or your C
library lacks large file support for large files. Some of the
programs that can benefit from large file support include dd, gzip,
cp, mount, tar, and many others. If you want to access files larger
than 2 Gigabytes, enable this option. Otherwise, leave it set to 'N'.
config CROSS_COMPILER_PREFIX
string "Cross Compiler prefix"
default ""
help
If you want to build BusyBox with a cross compiler, then you
will need to set this to the cross-compiler prefix, for example,
"i386-uclibc-".
Note that CROSS_COMPILE environment variable or
"make CROSS_COMPILE=xxx ..." will override this selection.
Native builds leave this empty.
config SYSROOT
string "Path to sysroot"
default ""
help
If you want to build BusyBox with a cross compiler, then you
might also need to specify where /usr/include and /usr/lib
will be found.
For example, BusyBox can be built against an installed
Android NDK, platform version 9, for ARM ABI with
CONFIG_SYSROOT=/opt/android-ndk/platforms/android-9/arch-arm
Native builds leave this empty.
config EXTRA_CFLAGS
string "Additional CFLAGS"
default ""
help
Additional CFLAGS to pass to the compiler verbatim.
config EXTRA_LDFLAGS
string "Additional LDFLAGS"
default ""
help
Additional LDFLAGS to pass to the linker verbatim.
config EXTRA_LDLIBS
string "Additional LDLIBS"
default ""
help
Additional LDLIBS to pass to the linker with -l.
endmenu
menu 'Debugging Options'
config DEBUG
bool "Build BusyBox with extra Debugging symbols"
default n
help
Say Y here if you wish to examine BusyBox internals while applets are
running. This increases the size of the binary considerably, and
should only be used when doing development. If you are doing
development and want to debug BusyBox, answer Y.
Most people should answer N.
config DEBUG_PESSIMIZE
bool "Disable compiler optimizations"
default n
depends on DEBUG
help
The compiler's optimization of source code can eliminate and reorder
code, resulting in an executable that's hard to understand when
stepping through it with a debugger. This switches it off, resulting
in a much bigger executable that more closely matches the source
code.
config WERROR
bool "Abort compilation on any warning"
default n
help
Selecting this will add -Werror to gcc command line.
Most people should answer N.
choice
prompt "Additional debugging library"
default NO_DEBUG_LIB
help
Using an additional debugging library will make BusyBox become
considerable larger and will cause it to run more slowly. You
should always leave this option disabled for production use.
dmalloc support:
----------------
This enables compiling with dmalloc ( http://dmalloc.com/ )
which is an excellent public domain mem leak and malloc problem
detector. To enable dmalloc, before running busybox you will
want to properly set your environment, for example:
export DMALLOC_OPTIONS=debug=0x34f47d83,inter=100,log=logfile
The 'debug=' value is generated using the following command
dmalloc -p log-stats -p log-non-free -p log-bad-space \
-p log-elapsed-time -p check-fence -p check-heap \
-p check-lists -p check-blank -p check-funcs -p realloc-copy \
-p allow-free-null
Electric-fence support:
-----------------------
This enables compiling with Electric-fence support. Electric
fence is another very useful malloc debugging library which uses
your computer's virtual memory hardware to detect illegal memory
accesses. This support will make BusyBox be considerable larger
and run slower, so you should leave this option disabled unless
you are hunting a hard to find memory problem.
config NO_DEBUG_LIB
bool "None"
config DMALLOC
bool "Dmalloc"
config EFENCE
bool "Electric-fence"
endchoice
endmenu
menu 'Installation Options ("make install" behavior)'
choice
prompt "What kind of applet links to install"
default INSTALL_APPLET_SYMLINKS
help
Choose what kind of links to applets are created by "make install".
config INSTALL_APPLET_SYMLINKS
bool "as soft-links"
help
Install applets as soft-links to the busybox binary. This needs some
free inodes on the filesystem, but might help with filesystem
generators that can't cope with hard-links.
config INSTALL_APPLET_HARDLINKS
bool "as hard-links"
help
Install applets as hard-links to the busybox binary. This might
count on a filesystem with few inodes.
config INSTALL_APPLET_SCRIPT_WRAPPERS
bool "as script wrappers"
help
Install applets as script wrappers that call the busybox binary.
config INSTALL_APPLET_DONT
bool "not installed"
help
Do not install applet links. Useful when you plan to use
busybox --install for installing links, or plan to use
a standalone shell and thus don't need applet links.
endchoice
choice
prompt "/bin/sh applet link"
default INSTALL_SH_APPLET_SYMLINK
depends on INSTALL_APPLET_SCRIPT_WRAPPERS
help
Choose how you install /bin/sh applet link.
config INSTALL_SH_APPLET_SYMLINK
bool "as soft-link"
help
Install /bin/sh applet as soft-link to the busybox binary.
config INSTALL_SH_APPLET_HARDLINK
bool "as hard-link"
help
Install /bin/sh applet as hard-link to the busybox binary.
config INSTALL_SH_APPLET_SCRIPT_WRAPPER
bool "as script wrapper"
help
Install /bin/sh applet as script wrapper that calls
the busybox binary.
endchoice
config PREFIX
string "BusyBox installation prefix"
default "./_install"
help
Define your directory to install BusyBox files/subdirs in.
endmenu
source libbb/Config.in
endmenu
comment "Applets"
source archival/Config.in
source coreutils/Config.in
source console-tools/Config.in
source debianutils/Config.in
source editors/Config.in
source findutils/Config.in
source init/Config.in
source loginutils/Config.in
source e2fsprogs/Config.in
source modutils/Config.in
source util-linux/Config.in
source miscutils/Config.in
source networking/Config.in
source printutils/Config.in
source mailutils/Config.in
source procps/Config.in
source runit/Config.in
source selinux/Config.in
source shell/Config.in
source sysklogd/Config.in