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- #
- # For a description of the syntax of this configuration file,
- # see docs/Kconfig-language.txt.
- #
- comment "Library Tuning"
- INSERT
- 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 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 PASSWORD_MINLEN
- int "Minimum password length"
- default 6
- range 5 32
- help
- Minimum allowable password length.
- config MD5_SMALL
- int "MD5: Trade bytes for speed (0:fast, 3:slow)"
- default 1 # all "fast or small" options default to small
- range 0 3
- help
- Trade binary size versus speed for the md5sum algorithm.
- Approximate values running uClibc and hashing
- linux-2.4.4.tar.bz2 were:
- value user times (sec) text size (386)
- 0 (fastest) 1.1 6144
- 1 1.4 5392
- 2 3.0 5088
- 3 (smallest) 5.1 4912
- config SHA3_SMALL
- int "SHA3: Trade bytes for speed (0:fast, 1:slow)"
- default 1 # all "fast or small" options default to small
- range 0 1
- help
- Trade binary size versus speed for the sha3sum algorithm.
- SHA3_SMALL=0 compared to SHA3_SMALL=1 (approximate):
- 64-bit x86: +270 bytes of code, 45% faster
- 32-bit x86: +450 bytes of code, 75% faster
- config FEATURE_FAST_TOP
- bool "Faster /proc scanning code (+100 bytes)"
- default n # all "fast or small" options default to small
- help
- This option makes top and ps ~20% faster (or 20% less CPU hungry),
- but code size is slightly bigger.
- config FEATURE_ETC_NETWORKS
- bool "Support /etc/networks"
- default n
- help
- Enable support for network names in /etc/networks. This is
- a rarely used feature which allows you to use names
- instead of IP/mask pairs in route command.
- config FEATURE_ETC_SERVICES
- bool "Consult /etc/services even for well-known ports"
- default n
- help
- Look up e.g. "telnet" and "http" in /etc/services file
- instead of assuming ports 23 and 80.
- This is almost never necessary (everybody uses standard ports),
- and it makes sense to avoid reading this file.
- If you disable this option, in the cases where port is explicitly
- specified as a service name (e.g. "telnet HOST PORTNAME"),
- it will still be looked up in /etc/services.
- config FEATURE_EDITING
- bool "Command line editing"
- default y
- help
- Enable line editing (mainly for shell command line).
- config FEATURE_EDITING_MAX_LEN
- int "Maximum length of input"
- range 128 8192
- default 1024
- depends on FEATURE_EDITING
- help
- Line editing code uses on-stack buffers for storage.
- You may want to decrease this parameter if your target machine
- benefits from smaller stack usage.
- config FEATURE_EDITING_VI
- bool "vi-style line editing commands"
- default n
- depends on FEATURE_EDITING
- help
- Enable vi-style line editing. In shells, this mode can be
- turned on and off with "set -o vi" and "set +o vi".
- config FEATURE_EDITING_HISTORY
- int "History size"
- # Don't allow way too big values here, code uses fixed "char *history[N]" struct member
- range 0 9999
- default 255
- depends on FEATURE_EDITING
- help
- Specify command history size (0 - disable).
- config FEATURE_EDITING_SAVEHISTORY
- bool "History saving"
- default y
- depends on FEATURE_EDITING
- help
- Enable history saving in shells.
- config FEATURE_EDITING_SAVE_ON_EXIT
- bool "Save history on shell exit, not after every command"
- default n
- depends on FEATURE_EDITING_SAVEHISTORY
- help
- Save history on shell exit, not after every command.
- config FEATURE_REVERSE_SEARCH
- bool "Reverse history search"
- default y
- depends on FEATURE_EDITING
- help
- Enable readline-like Ctrl-R combination for reverse history search.
- Increases code by about 0.5k.
- config FEATURE_TAB_COMPLETION
- bool "Tab completion"
- default y
- depends on FEATURE_EDITING
- config FEATURE_USERNAME_COMPLETION
- bool "Username completion"
- default y
- depends on FEATURE_TAB_COMPLETION
- config FEATURE_EDITING_FANCY_PROMPT
- bool "Fancy shell prompts"
- default y
- depends on FEATURE_EDITING
- help
- Setting this option allows for prompts to use things like \w and
- \$ and escape codes.
- config FEATURE_EDITING_WINCH
- bool "Enable automatic tracking of window size changes"
- default y
- depends on FEATURE_EDITING
- config FEATURE_EDITING_ASK_TERMINAL
- bool "Query cursor position from terminal"
- default n
- depends on FEATURE_EDITING
- help
- Allow usage of "ESC [ 6 n" sequence. Terminal answers back with
- current cursor position. This information is used to make line
- editing more robust in some cases.
- If you are not sure whether your terminals respond to this code
- correctly, or want to save on code size (about 400 bytes),
- then do not turn this option on.
- 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 $LC_ALL, $LC_CTYPE and $LANG environment variables"
- default n
- depends on UNICODE_SUPPORT && !UNICODE_USING_LOCALE
- help
- With this option on, Unicode support is activated
- only if locale-related variables have 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 characters with substitution character.
- The idea is that many valid printable Unicode chars
- 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 FEATURE_NON_POSIX_CP
- bool "Non-POSIX, but safer, copying to special nodes"
- default y
- help
- With this option, "cp file symlink" will delete symlink
- and create a regular file. This does not conform to POSIX,
- but prevents a symlink attack.
- Similarly, "cp file device" will not send file's data
- to the device. (To do that, use "cat file >device")
- config FEATURE_VERBOSE_CP_MESSAGE
- bool "Give more precise messages when copy fails (cp, mv etc)"
- default n
- help
- Error messages with this feature enabled:
- $ cp file /does_not_exist/file
- cp: cannot create '/does_not_exist/file': Path does not exist
- $ cp file /vmlinuz/file
- cp: cannot stat '/vmlinuz/file': Path has non-directory component
- If this feature is not enabled, they will be, respectively:
- cp: cannot create '/does_not_exist/file': No such file or directory
- cp: cannot stat '/vmlinuz/file': Not a directory
- This will cost you ~60 bytes.
- config FEATURE_USE_SENDFILE
- bool "Use sendfile system call"
- default y
- select PLATFORM_LINUX
- help
- When enabled, busybox will use the kernel sendfile() function
- instead of read/write loops to copy data between file descriptors
- (for example, cp command does this a lot).
- If sendfile() doesn't work, copying code falls back to read/write
- loop. sendfile() was originally implemented for faster I/O
- from files to sockets, but since Linux 2.6.33 it was extended
- to work for many more file types.
- config FEATURE_COPYBUF_KB
- int "Copy buffer size, in kilobytes"
- range 1 1024
- default 4
- help
- Size of buffer used by cp, mv, install, wget etc.
- Buffers which are 4 kb or less will be allocated on stack.
- Bigger buffers will be allocated with mmap, with fallback to 4 kb
- stack buffer if mmap fails.
- config FEATURE_SKIP_ROOTFS
- bool "Skip rootfs in mount table"
- default y
- help
- Ignore rootfs entry in mount table.
- In Linux, kernel has a special filesystem, rootfs, which is initially
- mounted on /. It contains initramfs data, if kernel is configured
- to have one. Usually, another file system is mounted over / early
- in boot process, and therefore most tools which manipulate
- mount table, such as df, will skip rootfs entry.
- However, some systems do not mount anything on /.
- If you need to configure busybox for one of these systems,
- you may find it useful to turn this option off to make df show
- initramfs statistics.
- Otherwise, choose Y.
- config MONOTONIC_SYSCALL
- bool "Use clock_gettime(CLOCK_MONOTONIC) syscall"
- default y
- select PLATFORM_LINUX
- help
- Use clock_gettime(CLOCK_MONOTONIC) syscall for measuring
- time intervals (time, ping, traceroute etc need this).
- Probably requires Linux 2.6+. If not selected, gettimeofday
- will be used instead (which gives wrong results if date/time
- is reset).
- config IOCTL_HEX2STR_ERROR
- bool "Use ioctl names rather than hex values in error messages"
- default y
- help
- Use ioctl names rather than hex values in error messages
- (e.g. VT_DISALLOCATE rather than 0x5608). If disabled this
- saves about 1400 bytes.
- config FEATURE_HWIB
- bool "Support infiniband HW"
- default y
- help
- Support for printing infiniband addresses in network applets.
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