# # 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 NITPICK bool "See lots more (probably unnecessary) configuration options." default n help Some BusyBox applets have more configuration options than anyone will ever care about. To avoid drowining people in complexity, most of the applet features that can be set to a sane default value are hidden, unless you hit the above switch. This is better than to telling people to edit the busybox source code, but not by much. See http://en.wikipedia.org/wiki/Fibber_McGee_and_Molly#The_Closet You have been warned. config DESKTOP bool "Enable options for full-blown desktop systems" default n 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. choice prompt "Buffer allocation policy" default FEATURE_BUFFERS_USE_MALLOC depends on NITPICK 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 terse applet usage messages" default y help All BusyBox applets will show help messages when invoked with wrong arguments. You can turn off printing these terse usage messages if you say no here. This will save you up to 7k. config FEATURE_VERBOSE_USAGE bool "Show verbose applet usage messages" default n select SHOW_USAGE help All BusyBox applets will show more 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 compressed form, uncompress them on-the-fly when --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 n 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 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 GETOPT_LONG 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/ for the slave side. Otherwise, BSD style /dev/ttyp 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 depends on NITPICK 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_PIDFILE bool "Support writing pidfiles" default n 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 n help With this option you can install the busybox binary belonging to root with the suid bit set, and it'll and it'll automatically drop priviledges for applets that don't need root access. If you're 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 currently marked to need the suid bit are login, passwd, su, ping, traceroute, crontab, dnsd, ipcrm, ipcs, and vlock. config FEATURE_SUID_CONFIG bool "Runtime SUID/SGID configuration via /etc/busybox.conf" default n if FEATURE_SUID 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: = [Ssx-][Ssx-][x-] (|).(|) 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 # and runs with euid=0 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: . 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 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 \ LDFLAGS=-L \ 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/ -> 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 "Support for logging to syslog" 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 "RPC support" 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 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'. config BUILD_LIBBUSYBOX bool "Build shared libbusybox" default n depends on !FEATURE_PREFER_APPLETS 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 !STATIC && 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 !STATIC && 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 n select FDISK_SUPPORT_LARGE_DISKS 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'. 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 WERROR bool "Abort compilation on any warning" default n help Selecting this will add -Werror to gcc command line. Most people should answer N. # Seems to be unused #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. 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 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 ') will be supported in head, tail, and fold. (Note: should affect renice too.) endmenu menu 'Installation Options' config INSTALL_NO_USR bool "Don't use /usr" default n help Disable use of /usr. Don't activate this option if you don't know that you really want this behaviour. choice prompt "Applets links" default INSTALL_APPLET_SYMLINKS help Choose how you install applets links. 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" depends on FEATURE_INSTALLER || FEATURE_SH_STANDALONE || FEATURE_PREFER_APPLETS help Do not install applet links. Useful when using the -install feature or a standalone shell for rescue purposes. 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 call 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 procps/Config.in source shell/Config.in source sysklogd/Config.in source runit/Config.in source selinux/Config.in source printutils/Config.in