| # |
| # 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. |
