2 # For a description of the syntax of this configuration file,
3 # see scripts/kbuild/config-language.txt.
6 mainmenu "BusyBox Configuration"
12 menu "Busybox Settings"
14 menu "General Configuration"
17 bool "Enable options for full-blown desktop systems"
20 Enable options and features which are not essential.
21 Select this only if you plan to use busybox on full-blown
22 desktop machine with common Linux distro, not on an embedded box.
25 bool "Provide compatible behavior for rare corner cases (bigger code)"
28 This option makes grep, sed etc handle rare corner cases
29 (embedded NUL bytes and such). This makes code bigger and uses
30 some GNU extensions in libc. You probably only need this option
31 if you plan to run busybox on desktop.
34 bool "Enable obsolete features removed before SUSv3"
37 This option will enable backwards compatibility with SuSv2,
38 specifically, old-style numeric options ('command -1 <file>')
39 will be supported in head, tail, and fold. (Note: should
42 config USE_PORTABLE_CODE
43 bool "Avoid using GCC-specific code constructs"
46 Use this option if you are trying to compile busybox with
47 compiler other than gcc.
48 If you do use gcc, this option may needlessly increase code size.
51 prompt "Buffer allocation policy"
52 default FEATURE_BUFFERS_USE_MALLOC
54 There are 3 ways BusyBox can handle buffer allocations:
55 - Use malloc. This costs code size for the call to xmalloc.
56 - Put them on stack. For some very small machines with limited stack
57 space, this can be deadly. For most folks, this works just fine.
58 - Put them in BSS. This works beautifully for computers with a real
59 MMU (and OS support), but wastes runtime RAM for uCLinux. This
60 behavior was the only one available for BusyBox versions 0.48 and
63 config FEATURE_BUFFERS_USE_MALLOC
64 bool "Allocate with Malloc"
66 config FEATURE_BUFFERS_GO_ON_STACK
67 bool "Allocate on the Stack"
69 config FEATURE_BUFFERS_GO_IN_BSS
70 bool "Allocate in the .bss section"
75 bool "Show terse applet usage messages"
78 All BusyBox applets will show help messages when invoked with
79 wrong arguments. You can turn off printing these terse usage
80 messages if you say no here.
81 This will save you up to 7k.
83 config FEATURE_VERBOSE_USAGE
84 bool "Show verbose applet usage messages"
88 All BusyBox applets will show more verbose help messages when
89 busybox is invoked with --help. This will add a lot of text to the
90 busybox binary. In the default configuration, this will add about
91 13k, but it can add much more depending on your configuration.
93 config FEATURE_COMPRESS_USAGE
94 bool "Store applet usage messages in compressed form"
98 Store usage messages in compressed form, uncompress them on-the-fly
99 when <applet> --help is called.
101 If you have a really tiny busybox with few applets enabled (and
102 bunzip2 isn't one of them), the overhead of the decompressor might
103 be noticeable. Also, if you run executables directly from ROM
104 and have very little memory, this might not be a win. Otherwise,
105 you probably want this.
107 config FEATURE_INSTALLER
108 bool "Support --install [-s] to install applet links at runtime"
111 Enable 'busybox --install [-s]' support. This will allow you to use
112 busybox at runtime to create hard links or symlinks for all the
113 applets that are compiled into busybox.
115 config LOCALE_SUPPORT
116 bool "Enable locale support (system needs locale for this to work)"
119 Enable this if your system has locale support and you would like
120 busybox to support locale settings.
122 config FEATURE_ASSUME_UNICODE
123 bool "Support Unicode"
126 This makes various applets aware that one byte is not
127 one character on screen.
129 Busybox aims to eventually work correctly with Unicode displays.
130 Any older encodings are not guaranteed to work.
131 Probably by the time when busybox will be fully Unicode-clean,
132 other encodings will be mainly of historic interest.
134 config FEATURE_CHECK_UNICODE_IN_ENV
135 bool "Check $LANG environment variable"
137 depends on FEATURE_ASSUME_UNICODE && !LOCALE_SUPPORT
139 With this option on, Unicode support is activated
140 only if LANG variable has the value of the form "xxxx.utf8"
142 Otherwise, Unicode support will be always enabled and active.
145 bool "Support for --long-options"
148 Enable this if you want busybox applets to use the gnu --long-option
149 style, in addition to single character -a -b -c style options.
151 config FEATURE_DEVPTS
152 bool "Use the devpts filesystem for Unix98 PTYs"
155 Enable if you want BusyBox to use Unix98 PTY support. If enabled,
156 busybox will use /dev/ptmx for the master side of the pseudoterminal
157 and /dev/pts/<number> for the slave side. Otherwise, BSD style
158 /dev/ttyp<number> will be used. To use this option, you should have
161 config FEATURE_CLEAN_UP
162 bool "Clean up all memory before exiting (usually not needed)"
165 As a size optimization, busybox normally exits without explicitly
166 freeing dynamically allocated memory or closing files. This saves
167 space since the OS will clean up for us, but it can confuse debuggers
168 like valgrind, which report tons of memory and resource leaks.
170 Don't enable this unless you have a really good reason to clean
173 config FEATURE_PIDFILE
174 bool "Support writing pidfiles"
177 This option makes some applets (e.g. crond, syslogd, inetd) write
178 a pidfile in /var/run. Some applications rely on them.
181 bool "Support for SUID/SGID handling"
184 With this option you can install the busybox binary belonging
185 to root with the suid bit set, and it will automatically drop
186 priviledges for applets that don't need root access.
188 If you are really paranoid and don't want to do this, build two
189 busybox binaries with different applets in them (and the appropriate
190 symlinks pointing to each binary), and only set the suid bit on the
191 one that needs it. The applets currently marked to need the suid bit
194 crontab, dnsd, findfs, ipcrm, ipcs, login, passwd, ping, su,
197 config FEATURE_SUID_CONFIG
198 bool "Runtime SUID/SGID configuration via /etc/busybox.conf"
199 default n if FEATURE_SUID
200 depends on FEATURE_SUID
202 Allow the SUID / SGID state of an applet to be determined at runtime
203 by checking /etc/busybox.conf. (This is sort of a poor man's sudo.)
204 The format of this file is as follows:
206 <applet> = [Ssx-][Ssx-][x-] (<username>|<uid>).(<groupname>|<gid>)
208 An example might help:
211 su = ssx root.0 # applet su can be run by anyone and runs with
213 su = ssx # exactly the same
215 mount = sx- root.disk # applet mount can be run by root and members
216 # of group disk and runs with euid=0
218 cp = --- # disable applet cp for everyone
220 The file has to be owned by user root, group root and has to be
221 writeable only by root:
222 (chown 0.0 /etc/busybox.conf; chmod 600 /etc/busybox.conf)
223 The busybox executable has to be owned by user root, group
224 root and has to be setuid root for this to work:
225 (chown 0.0 /bin/busybox; chmod 4755 /bin/busybox)
227 Robert 'sandman' Griebl has more information here:
228 <url: http://www.softforge.de/bb/suid.html >.
230 config FEATURE_SUID_CONFIG_QUIET
231 bool "Suppress warning message if /etc/busybox.conf is not readable"
233 depends on FEATURE_SUID_CONFIG
235 /etc/busybox.conf should be readable by the user needing the SUID,
236 check this option to avoid users to be notified about missing
240 bool "Support NSA Security Enhanced Linux"
243 Enable support for SELinux in applets ls, ps, and id. Also provide
244 the option of compiling in SELinux applets.
246 If you do not have a complete SELinux userland installed, this stuff
247 will not compile. Go visit
248 http://www.nsa.gov/selinux/index.html
249 to download the necessary stuff to allow busybox to compile with
250 this option enabled. Specifially, libselinux 1.28 or better is
251 directly required by busybox. If the installation is located in a
252 non-standard directory, provide it by invoking make as follows:
253 CFLAGS=-I<libselinux-include-path> \
254 LDFLAGS=-L<libselinux-lib-path> \
257 Most people will leave this set to 'N'.
259 config FEATURE_PREFER_APPLETS
260 bool "exec prefers applets"
263 This is an experimental option which directs applets about to
264 call 'exec' to try and find an applicable busybox applet before
265 searching the PATH. This is typically done by exec'ing
267 This may affect shell, find -exec, xargs and similar applets.
268 They will use applets even if /bin/<applet> -> busybox link
269 is missing (or is not a link to busybox). However, this causes
270 problems in chroot jails without mounted /proc and with ps/top
271 (command name can be shown as 'exe' for applets started this way).
273 config BUSYBOX_EXEC_PATH
274 string "Path to BusyBox executable"
275 default "/proc/self/exe"
277 When Busybox applets need to run other busybox applets, BusyBox
278 sometimes needs to exec() itself. When the /proc filesystem is
279 mounted, /proc/self/exe always points to the currently running
280 executable. If you haven't got /proc, set this to wherever you
281 want to run BusyBox from.
283 # These are auto-selected by other options
285 config FEATURE_SYSLOG
286 bool #No description makes it a hidden option
289 # This option is auto-selected when you select any applet which may
290 # send its output to syslog. You do not need to select it manually.
292 config FEATURE_HAVE_RPC
293 bool #No description makes it a hidden option
296 # This is automatically selected if any of enabled applets need it.
297 # You do not need to select it manually.
304 bool "Build BusyBox as a static binary (no shared libs)"
307 If you want to build a static BusyBox binary, which does not
308 use or require any shared libraries, then enable this option.
309 This can cause BusyBox to be considerably larger, so you should
310 leave this option false unless you have a good reason (i.e.
311 your target platform does not support shared libraries, or
312 you are building an initrd which doesn't need anything but
315 Most people will leave this set to 'N'.
318 bool "Build BusyBox as a position independent executable"
322 (TODO: what is it and why/when is it useful?)
323 Most people will leave this set to 'N'.
326 bool "Force NOMMU build"
329 Busybox tries to detect whether architecture it is being
330 built against supports MMU or not. If this detection fails,
331 or if you want to build NOMMU version of busybox for testing,
332 you may force NOMMU build here.
334 Most people will leave this set to 'N'.
336 # PIE can be made to work with BUILD_LIBBUSYBOX, but currently
337 # build system does not support that
338 config BUILD_LIBBUSYBOX
339 bool "Build shared libbusybox"
341 depends on !FEATURE_PREFER_APPLETS && !PIE && !STATIC
343 Build a shared library libbusybox.so.N.N.N which contains all
346 This feature allows every applet to be built as a tiny
347 separate executable. Enabling it for "one big busybox binary"
348 approach serves no purpose and increases code size.
349 You should almost certainly say "no" to this.
351 ### config FEATURE_FULL_LIBBUSYBOX
352 ### bool "Feature-complete libbusybox"
353 ### default n if !FEATURE_SHARED_BUSYBOX
354 ### depends on BUILD_LIBBUSYBOX
356 ### Build a libbusybox with the complete feature-set, disregarding
357 ### the actually selected config.
359 ### Normally, libbusybox will only contain the features which are
360 ### used by busybox itself. If you plan to write a separate
361 ### standalone application which uses libbusybox say 'Y'.
363 ### Note: libbusybox is GPL, not LGPL, and exports no stable API that
364 ### might act as a copyright barrier. We can and will modify the
365 ### exported function set between releases (even minor version number
366 ### changes), and happily break out-of-tree features.
368 ### Say 'N' if in doubt.
370 config FEATURE_INDIVIDUAL
371 bool "Produce a binary for each applet, linked against libbusybox"
373 depends on BUILD_LIBBUSYBOX
375 If your CPU architecture doesn't allow for sharing text/rodata
376 sections of running binaries, but allows for runtime dynamic
377 libraries, this option will allow you to reduce memory footprint
378 when you have many different applets running at once.
380 If your CPU architecture allows for sharing text/rodata,
381 having single binary is more optimal.
383 Each applet will be a tiny program, dynamically linked
384 against libbusybox.so.N.N.N.
386 You need to have a working dynamic linker.
388 config FEATURE_SHARED_BUSYBOX
389 bool "Produce additional busybox binary linked against libbusybox"
391 depends on BUILD_LIBBUSYBOX
393 Build busybox, dynamically linked against libbusybox.so.N.N.N.
395 You need to have a working dynamic linker.
397 ### config BUILD_AT_ONCE
398 ### bool "Compile all sources at once"
401 ### Normally each source-file is compiled with one invocation of
403 ### If you set this option, all sources are compiled at once.
404 ### This gives the compiler more opportunities to optimize which can
405 ### result in smaller and/or faster binaries.
407 ### Setting this option will consume alot of memory, e.g. if you
408 ### enable all applets with all features, gcc uses more than 300MB
409 ### RAM during compilation of busybox.
411 ### This option is most likely only beneficial for newer compilers
412 ### such as gcc-4.1 and above.
414 ### Say 'N' unless you know what you are doing.
417 bool "Build with Large File Support (for accessing files > 2 GB)"
419 select FDISK_SUPPORT_LARGE_DISKS
421 If you want to build BusyBox with large file support, then enable
422 this option. This will have no effect if your kernel or your C
423 library lacks large file support for large files. Some of the
424 programs that can benefit from large file support include dd, gzip,
425 cp, mount, tar, and many others. If you want to access files larger
426 than 2 Gigabytes, enable this option. Otherwise, leave it set to 'N'.
428 config CROSS_COMPILER_PREFIX
429 string "Cross Compiler prefix"
432 If you want to build BusyBox with a cross compiler, then you
433 will need to set this to the cross-compiler prefix, for example,
436 Note that CROSS_COMPILE environment variable or
437 "make CROSS_COMPILE=xxx ..." will override this selection.
439 Native builds leave this empty.
442 string "Additional CFLAGS"
445 Additional CFLAGS to pass to the compiler verbatim.
449 menu 'Debugging Options'
452 bool "Build BusyBox with extra Debugging symbols"
455 Say Y here if you wish to examine BusyBox internals while applets are
456 running. This increases the size of the binary considerably, and
457 should only be used when doing development. If you are doing
458 development and want to debug BusyBox, answer Y.
460 Most people should answer N.
462 config DEBUG_PESSIMIZE
463 bool "Disable compiler optimizations"
467 The compiler's optimization of source code can eliminate and reorder
468 code, resulting in an executable that's hard to understand when
469 stepping through it with a debugger. This switches it off, resulting
470 in a much bigger executable that more closely matches the source
474 bool "Abort compilation on any warning"
477 Selecting this will add -Werror to gcc command line.
479 Most people should answer N.
482 prompt "Additional debugging library"
485 Using an additional debugging library will make BusyBox become
486 considerable larger and will cause it to run more slowly. You
487 should always leave this option disabled for production use.
491 This enables compiling with dmalloc ( http://dmalloc.com/ )
492 which is an excellent public domain mem leak and malloc problem
493 detector. To enable dmalloc, before running busybox you will
494 want to properly set your environment, for example:
495 export DMALLOC_OPTIONS=debug=0x34f47d83,inter=100,log=logfile
496 The 'debug=' value is generated using the following command
497 dmalloc -p log-stats -p log-non-free -p log-bad-space \
498 -p log-elapsed-time -p check-fence -p check-heap \
499 -p check-lists -p check-blank -p check-funcs -p realloc-copy \
502 Electric-fence support:
503 -----------------------
504 This enables compiling with Electric-fence support. Electric
505 fence is another very useful malloc debugging library which uses
506 your computer's virtual memory hardware to detect illegal memory
507 accesses. This support will make BusyBox be considerable larger
508 and run slower, so you should leave this option disabled unless
509 you are hunting a hard to find memory problem.
519 bool "Electric-fence"
524 ### bool "Uniform config file parser debugging applet: parse"
528 menu 'Installation Options'
530 config INSTALL_NO_USR
531 bool "Don't use /usr"
534 Disable use of /usr. Don't activate this option if you don't know
535 that you really want this behaviour.
538 prompt "Applets links"
539 default INSTALL_APPLET_SYMLINKS
541 Choose how you install applets links.
543 config INSTALL_APPLET_SYMLINKS
546 Install applets as soft-links to the busybox binary. This needs some
547 free inodes on the filesystem, but might help with filesystem
548 generators that can't cope with hard-links.
550 config INSTALL_APPLET_HARDLINKS
553 Install applets as hard-links to the busybox binary. This might
554 count on a filesystem with few inodes.
556 config INSTALL_APPLET_SCRIPT_WRAPPERS
557 bool "as script wrappers"
559 Install applets as script wrappers that call the busybox binary.
561 config INSTALL_APPLET_DONT
563 depends on FEATURE_INSTALLER || FEATURE_SH_STANDALONE || FEATURE_PREFER_APPLETS
565 Do not install applet links. Useful when using the -install feature
566 or a standalone shell for rescue purposes.
571 prompt "/bin/sh applet link"
572 default INSTALL_SH_APPLET_SYMLINK
573 depends on INSTALL_APPLET_SCRIPT_WRAPPERS
575 Choose how you install /bin/sh applet link.
577 config INSTALL_SH_APPLET_SYMLINK
580 Install /bin/sh applet as soft-link to the busybox binary.
582 config INSTALL_SH_APPLET_HARDLINK
585 Install /bin/sh applet as hard-link to the busybox binary.
587 config INSTALL_SH_APPLET_SCRIPT_WRAPPER
588 bool "as script wrapper"
590 Install /bin/sh applet as script wrapper that call the busybox
596 string "BusyBox installation prefix"
599 Define your directory to install BusyBox files/subdirs in.
603 source libbb/Config.in
609 source archival/Config.in
610 source coreutils/Config.in
611 source console-tools/Config.in
612 source debianutils/Config.in
613 source editors/Config.in
614 source findutils/Config.in
615 source init/Config.in
616 source loginutils/Config.in
617 source e2fsprogs/Config.in
618 source modutils/Config.in
619 source util-linux/Config.in
620 source miscutils/Config.in
621 source networking/Config.in
622 source printutils/Config.in
623 source mailutils/Config.in
624 source procps/Config.in
625 source runit/Config.in
626 source selinux/Config.in
627 source shell/Config.in
628 source sysklogd/Config.in