package/utils/busybox/config/libbb/Config.in

   1 # DO NOT EDIT. This file is generated from Config.src
   2 #
   3 # For a description of the syntax of this configuration file,
   4 # see scripts/kbuild/config-language.txt.
   5 #
   6
   7 menu "Busybox Library Tuning"
   8
   9 config BUSYBOX_CONFIG_FEATURE_USE_BSS_TAIL
  10         bool "Use the end of BSS page"
  11         default BUSYBOX_DEFAULT_FEATURE_USE_BSS_TAIL
  12         help
  13           Attempt to reclaim a small unused part of BSS.
  14
  15           Executables have the following parts:
  16           = read-only executable code and constants, also known as "text"
  17           = read-write data
  18           = non-initialized (zeroed on demand) data, also known as "bss"
  19
  20           At link time, "text" is padded to a full page. At runtime, all "text"
  21           pages are mapped RO and executable.
  22           "Data" starts on the next page boundary, but is not padded
  23           to a full page at the end. "Bss" starts wherever "data" ends.
  24           At runtime, "data" pages are mapped RW and they are file-backed
  25           (this includes a small portion of "bss" which may live in the last
  26           partial page of "data").
  27           Pages which are fully in "bss" are mapped to anonymous memory.
  28
  29           "Bss" end is usually not page-aligned. There is an unused space
  30           in the last page. Linker marks its start with the "_end" symbol.
  31
  32           This option will attempt to use that space for bb_common_bufsiz1[]
  33           array. If it fits after _end, it will be used, and COMMON_BUFSIZE
  34           will be enlarged from its guaranteed minimum size of 1 kbyte.
  35           This may require recompilation a second time, since value of _end
  36           is known only after final link.
  37
  38           If you are getting a build error like this:
  39                 appletlib.c:(.text.main+0xd): undefined reference to '_end'
  40           disable this option.
  41 config BUSYBOX_CONFIG_FEATURE_RTMINMAX
  42         bool "Support RTMIN[+n] and RTMAX[-n] signal names"
  43         default BUSYBOX_DEFAULT_FEATURE_RTMINMAX
  44         help
  45           Support RTMIN[+n] and RTMAX[-n] signal names
  46           in kill, killall etc. This costs ~250 bytes.
  47
  48 choice
  49         prompt "Buffer allocation policy"
  50         default BUSYBOX_CONFIG_FEATURE_BUFFERS_GO_ON_STACK
  51         help
  52           There are 3 ways BusyBox can handle buffer allocations:
  53           - Use malloc. This costs code size for the call to xmalloc.
  54           - Put them on stack. For some very small machines with limited stack
  55             space, this can be deadly. For most folks, this works just fine.
  56           - Put them in BSS. This works beautifully for computers with a real
  57             MMU (and OS support), but wastes runtime RAM for uCLinux. This
  58             behavior was the only one available for BusyBox versions 0.48 and
  59             earlier.
  60
  61 config BUSYBOX_CONFIG_FEATURE_BUFFERS_USE_MALLOC
  62         bool "Allocate with Malloc"
  63
  64 config BUSYBOX_CONFIG_FEATURE_BUFFERS_GO_ON_STACK
  65         bool "Allocate on the Stack"
  66
  67 config BUSYBOX_CONFIG_FEATURE_BUFFERS_GO_IN_BSS
  68         bool "Allocate in the .bss section"
  69
  70 endchoice
  71
  72 config BUSYBOX_CONFIG_PASSWORD_MINLEN
  73         int "Minimum password length"
  74         default BUSYBOX_DEFAULT_PASSWORD_MINLEN
  75         range 5 32
  76         help
  77           Minimum allowable password length.
  78
  79 config BUSYBOX_CONFIG_MD5_SMALL
  80         int "MD5: Trade bytes for speed (0:fast, 3:slow)"
  81         default BUSYBOX_DEFAULT_MD5_SMALL  # all "fast or small" options default to small
  82         range 0 3
  83         help
  84           Trade binary size versus speed for the md5sum algorithm.
  85           Approximate values running uClibc and hashing
  86           linux-2.4.4.tar.bz2 were:
  87                             user times (sec)  text size (386)
  88           0 (fastest)         1.1                6144
  89           1                   1.4                5392
  90           2                   3.0                5088
  91           3 (smallest)        5.1                4912
  92
  93 config BUSYBOX_CONFIG_SHA3_SMALL
  94         int "SHA3: Trade bytes for speed (0:fast, 1:slow)"
  95         default BUSYBOX_DEFAULT_SHA3_SMALL  # all "fast or small" options default to small
  96         range 0 1
  97         help
  98           Trade binary size versus speed for the sha3sum algorithm.
  99           SHA3_SMALL=0 compared to SHA3_SMALL=1 (approximate):
 100           64-bit x86: +270 bytes of code, 45% faster
 101           32-bit x86: +450 bytes of code, 75% faster
 102
 103 config BUSYBOX_CONFIG_FEATURE_FAST_TOP
 104         bool "Faster /proc scanning code (+100 bytes)"
 105         default BUSYBOX_DEFAULT_FEATURE_FAST_TOP  # all "fast or small" options default to small
 106         help
 107           This option makes top (and ps) ~20% faster (or 20% less CPU hungry),
 108           but code size is slightly bigger.
 109
 110 config BUSYBOX_CONFIG_FEATURE_ETC_NETWORKS
 111         bool "Support /etc/networks"
 112         default BUSYBOX_DEFAULT_FEATURE_ETC_NETWORKS
 113         help
 114           Enable support for network names in /etc/networks. This is
 115           a rarely used feature which allows you to use names
 116           instead of IP/mask pairs in route command.
 117
 118 config BUSYBOX_CONFIG_FEATURE_EDITING
 119         bool "Command line editing"
 120         default BUSYBOX_DEFAULT_FEATURE_EDITING
 121         help
 122           Enable line editing (mainly for shell command line).
 123
 124 config BUSYBOX_CONFIG_FEATURE_EDITING_MAX_LEN
 125         int "Maximum length of input"
 126         range 128 8192
 127         default BUSYBOX_DEFAULT_FEATURE_EDITING_MAX_LEN
 128         depends on BUSYBOX_CONFIG_FEATURE_EDITING
 129         help
 130           Line editing code uses on-stack buffers for storage.
 131           You may want to decrease this parameter if your target machine
 132           benefits from smaller stack usage.
 133
 134 config BUSYBOX_CONFIG_FEATURE_EDITING_VI
 135         bool "vi-style line editing commands"
 136         default BUSYBOX_DEFAULT_FEATURE_EDITING_VI
 137         depends on BUSYBOX_CONFIG_FEATURE_EDITING
 138         help
 139           Enable vi-style line editing. In shells, this mode can be
 140           turned on and off with "set -o vi" and "set +o vi".
 141
 142 config BUSYBOX_CONFIG_FEATURE_EDITING_HISTORY
 143         int "History size"
 144         # Don't allow way too big values here, code uses fixed "char *history[N]" struct member
 145         range 0 9999
 146         default BUSYBOX_DEFAULT_FEATURE_EDITING_HISTORY
 147         depends on BUSYBOX_CONFIG_FEATURE_EDITING
 148         help
 149           Specify command history size (0 - disable).
 150
 151 config BUSYBOX_CONFIG_FEATURE_EDITING_SAVEHISTORY
 152         bool "History saving"
 153         default BUSYBOX_DEFAULT_FEATURE_EDITING_SAVEHISTORY
 154         depends on BUSYBOX_CONFIG_FEATURE_EDITING
 155         help
 156           Enable history saving in shells.
 157
 158 config BUSYBOX_CONFIG_FEATURE_EDITING_SAVE_ON_EXIT
 159         bool "Save history on shell exit, not after every command"
 160         default BUSYBOX_DEFAULT_FEATURE_EDITING_SAVE_ON_EXIT
 161         depends on BUSYBOX_CONFIG_FEATURE_EDITING_SAVEHISTORY
 162         help
 163           Save history on shell exit, not after every command.
 164
 165 config BUSYBOX_CONFIG_FEATURE_REVERSE_SEARCH
 166         bool "Reverse history search"
 167         default BUSYBOX_DEFAULT_FEATURE_REVERSE_SEARCH
 168         depends on BUSYBOX_CONFIG_FEATURE_EDITING
 169         help
 170           Enable readline-like Ctrl-R combination for reverse history search.
 171           Increases code by about 0.5k.
 172
 173 config BUSYBOX_CONFIG_FEATURE_TAB_COMPLETION
 174         bool "Tab completion"
 175         default BUSYBOX_DEFAULT_FEATURE_TAB_COMPLETION
 176         depends on BUSYBOX_CONFIG_FEATURE_EDITING
 177
 178 config BUSYBOX_CONFIG_FEATURE_USERNAME_COMPLETION
 179         bool "Username completion"
 180         default BUSYBOX_DEFAULT_FEATURE_USERNAME_COMPLETION
 181         depends on BUSYBOX_CONFIG_FEATURE_TAB_COMPLETION
 182
 183 config BUSYBOX_CONFIG_FEATURE_EDITING_FANCY_PROMPT
 184         bool "Fancy shell prompts"
 185         default BUSYBOX_DEFAULT_FEATURE_EDITING_FANCY_PROMPT
 186         depends on BUSYBOX_CONFIG_FEATURE_EDITING
 187         help
 188           Setting this option allows for prompts to use things like \w and
 189           \$ and escape codes.
 190
 191 config BUSYBOX_CONFIG_FEATURE_EDITING_ASK_TERMINAL
 192         bool "Query cursor position from terminal"
 193         default BUSYBOX_DEFAULT_FEATURE_EDITING_ASK_TERMINAL
 194         depends on BUSYBOX_CONFIG_FEATURE_EDITING
 195         help
 196           Allow usage of "ESC [ 6 n" sequence. Terminal answers back with
 197           current cursor position. This information is used to make line
 198           editing more robust in some cases.
 199           If you are not sure whether your terminals respond to this code
 200           correctly, or want to save on code size (about 400 bytes),
 201           then do not turn this option on.
 202
 203 config BUSYBOX_CONFIG_LOCALE_SUPPORT
 204         bool "Enable locale support (system needs locale for this to work)"
 205         default BUSYBOX_DEFAULT_LOCALE_SUPPORT
 206         help
 207           Enable this if your system has locale support and you would like
 208           busybox to support locale settings.
 209
 210 config BUSYBOX_CONFIG_UNICODE_SUPPORT
 211         bool "Support Unicode"
 212         default BUSYBOX_DEFAULT_UNICODE_SUPPORT
 213         help
 214           This makes various applets aware that one byte is not
 215           one character on screen.
 216
 217           Busybox aims to eventually work correctly with Unicode displays.
 218           Any older encodings are not guaranteed to work.
 219           Probably by the time when busybox will be fully Unicode-clean,
 220           other encodings will be mainly of historic interest.
 221
 222 config BUSYBOX_CONFIG_UNICODE_USING_LOCALE
 223         bool "Use libc routines for Unicode (else uses internal ones)"
 224         default BUSYBOX_DEFAULT_UNICODE_USING_LOCALE
 225         depends on BUSYBOX_CONFIG_UNICODE_SUPPORT && BUSYBOX_CONFIG_LOCALE_SUPPORT
 226         help
 227           With this option on, Unicode support is implemented using libc
 228           routines. Otherwise, internal implementation is used.
 229           Internal implementation is smaller.
 230
 231 config BUSYBOX_CONFIG_FEATURE_CHECK_UNICODE_IN_ENV
 232         bool "Check $LC_ALL, $LC_CTYPE and $LANG environment variables"
 233         default BUSYBOX_DEFAULT_FEATURE_CHECK_UNICODE_IN_ENV
 234         depends on BUSYBOX_CONFIG_UNICODE_SUPPORT && !BUSYBOX_CONFIG_UNICODE_USING_LOCALE
 235         help
 236           With this option on, Unicode support is activated
 237           only if locale-related variables have the value of the form
 238           "xxxx.utf8"
 239
 240           Otherwise, Unicode support will be always enabled and active.
 241
 242 config BUSYBOX_CONFIG_SUBST_WCHAR
 243         int "Character code to substitute unprintable characters with"
 244         depends on BUSYBOX_CONFIG_UNICODE_SUPPORT
 245         default BUSYBOX_DEFAULT_SUBST_WCHAR
 246         help
 247           Typical values are 63 for '?' (works with any output device),
 248           30 for ASCII substitute control code,
 249           65533 (0xfffd) for Unicode replacement character.
 250
 251 config BUSYBOX_CONFIG_LAST_SUPPORTED_WCHAR
 252         int "Range of supported Unicode characters"
 253         depends on BUSYBOX_CONFIG_UNICODE_SUPPORT
 254         default BUSYBOX_DEFAULT_LAST_SUPPORTED_WCHAR
 255         help
 256           Any character with Unicode value bigger than this is assumed
 257           to be non-printable on output device. Many applets replace
 258           such characters with substitution character.
 259
 260           The idea is that many valid printable Unicode chars
 261           nevertheless are not displayed correctly. Think about
 262           combining charachers, double-wide hieroglyphs, obscure
 263           characters in dozens of ancient scripts...
 264           Many terminals, terminal emulators, xterms etc will fail
 265           to handle them correctly. Choose the smallest value
 266           which suits your needs.
 267
 268           Typical values are:
 269           126 - ASCII only
 270           767 (0x2ff) - there are no combining chars in [0..767] range
 271                         (the range includes Latin 1, Latin Ext. A and B),
 272                         code is ~700 bytes smaller for this case.
 273           4351 (0x10ff) - there are no double-wide chars in [0..4351] range,
 274                         code is ~300 bytes smaller for this case.
 275           12799 (0x31ff) - nearly all non-ideographic characters are
 276                         available in [0..12799] range, including
 277                         East Asian scripts like katakana, hiragana, hangul,
 278                         bopomofo...
 279           0 - off, any valid printable Unicode character will be printed.
 280
 281 config BUSYBOX_CONFIG_UNICODE_COMBINING_WCHARS
 282         bool "Allow zero-width Unicode characters on output"
 283         default BUSYBOX_DEFAULT_UNICODE_COMBINING_WCHARS
 284         depends on BUSYBOX_CONFIG_UNICODE_SUPPORT
 285         help
 286           With this option off, any Unicode char with width of 0
 287           is substituted on output.
 288
 289 config BUSYBOX_CONFIG_UNICODE_WIDE_WCHARS
 290         bool "Allow wide Unicode characters on output"
 291         default BUSYBOX_DEFAULT_UNICODE_WIDE_WCHARS
 292         depends on BUSYBOX_CONFIG_UNICODE_SUPPORT
 293         help
 294           With this option off, any Unicode char with width > 1
 295           is substituted on output.
 296
 297 config BUSYBOX_CONFIG_UNICODE_BIDI_SUPPORT
 298         bool "Bidirectional character-aware line input"
 299         default BUSYBOX_DEFAULT_UNICODE_BIDI_SUPPORT
 300         depends on BUSYBOX_CONFIG_UNICODE_SUPPORT && !BUSYBOX_CONFIG_UNICODE_USING_LOCALE
 301         help
 302           With this option on, right-to-left Unicode characters
 303           are treated differently on input (e.g. cursor movement).
 304
 305 config BUSYBOX_CONFIG_UNICODE_NEUTRAL_TABLE
 306         bool "In bidi input, support non-ASCII neutral chars too"
 307         default BUSYBOX_DEFAULT_UNICODE_NEUTRAL_TABLE
 308         depends on BUSYBOX_CONFIG_UNICODE_BIDI_SUPPORT
 309         help
 310           In most cases it's enough to treat only ASCII non-letters
 311           (i.e. punctuation, numbers and space) as characters
 312           with neutral directionality.
 313           With this option on, more extensive (and bigger) table
 314           of neutral chars will be used.
 315
 316 config BUSYBOX_CONFIG_UNICODE_PRESERVE_BROKEN
 317         bool "Make it possible to enter sequences of chars which are not Unicode"
 318         default BUSYBOX_DEFAULT_UNICODE_PRESERVE_BROKEN
 319         depends on BUSYBOX_CONFIG_UNICODE_SUPPORT
 320         help
 321           With this option on, on line-editing input (such as used by shells)
 322           invalid UTF-8 bytes are not substituted with the selected
 323           substitution character.
 324           For example, this means that entering 'l', 's', ' ', 0xff, [Enter]
 325           at shell prompt will list file named 0xff (single char name
 326           with char value 255), not file named '?'.
 327
 328 config BUSYBOX_CONFIG_FEATURE_NON_POSIX_CP
 329         bool "Non-POSIX, but safer, copying to special nodes"
 330         default BUSYBOX_DEFAULT_FEATURE_NON_POSIX_CP
 331         help
 332           With this option, "cp file symlink" will delete symlink
 333           and create a regular file. This does not conform to POSIX,
 334           but prevents a symlink attack.
 335           Similarly, "cp file device" will not send file's data
 336           to the device. (To do that, use "cat file >device")
 337
 338 config BUSYBOX_CONFIG_FEATURE_VERBOSE_CP_MESSAGE
 339         bool "Give more precise messages when copy fails (cp, mv etc)"
 340         default BUSYBOX_DEFAULT_FEATURE_VERBOSE_CP_MESSAGE
 341         help
 342           Error messages with this feature enabled:
 343             $ cp file /does_not_exist/file
 344             cp: cannot create '/does_not_exist/file': Path does not exist
 345             $ cp file /vmlinuz/file
 346             cp: cannot stat '/vmlinuz/file': Path has non-directory component
 347           If this feature is not enabled, they will be, respectively:
 348             cp: cannot create '/does_not_exist/file': No such file or directory
 349             cp: cannot stat '/vmlinuz/file': Not a directory
 350           This will cost you ~60 bytes.
 351
 352 config BUSYBOX_CONFIG_FEATURE_USE_SENDFILE
 353         bool "Use sendfile system call"
 354         default BUSYBOX_DEFAULT_FEATURE_USE_SENDFILE
 355         select BUSYBOX_CONFIG_PLATFORM_LINUX
 356         help
 357           When enabled, busybox will use the kernel sendfile() function
 358           instead of read/write loops to copy data between file descriptors
 359           (for example, cp command does this a lot).
 360           If sendfile() doesn't work, copying code falls back to read/write
 361           loop. sendfile() was originally implemented for faster I/O
 362           from files to sockets, but since Linux 2.6.33 it was extended
 363           to work for many more file types.
 364
 365 config BUSYBOX_CONFIG_FEATURE_COPYBUF_KB
 366         int "Copy buffer size, in kilobytes"
 367         range 1 1024
 368         default BUSYBOX_DEFAULT_FEATURE_COPYBUF_KB
 369         help
 370           Size of buffer used by cp, mv, install, wget etc.
 371           Buffers which are 4 kb or less will be allocated on stack.
 372           Bigger buffers will be allocated with mmap, with fallback to 4 kb
 373           stack buffer if mmap fails.
 374
 375 config BUSYBOX_CONFIG_FEATURE_SKIP_ROOTFS
 376         bool "Skip rootfs in mount table"
 377         default BUSYBOX_DEFAULT_FEATURE_SKIP_ROOTFS
 378         help
 379           Ignore rootfs entry in mount table.
 380
 381           In Linux, kernel has a special filesystem, rootfs, which is initially
 382           mounted on /. It contains initramfs data, if kernel is configured
 383           to have one. Usually, another file system is mounted over / early
 384           in boot process, and therefore most tools which manipulate
 385           mount table, such as df, will skip rootfs entry.
 386
 387           However, some systems do not mount anything on /.
 388           If you need to configure busybox for one of these systems,
 389           you may find it useful to turn this option off to make df show
 390           initramfs statistics.
 391
 392           Otherwise, choose Y.
 393
 394 config BUSYBOX_CONFIG_MONOTONIC_SYSCALL
 395         bool "Use clock_gettime(CLOCK_MONOTONIC) syscall"
 396         default BUSYBOX_DEFAULT_MONOTONIC_SYSCALL
 397         select BUSYBOX_CONFIG_PLATFORM_LINUX
 398         help
 399           Use clock_gettime(CLOCK_MONOTONIC) syscall for measuring
 400           time intervals (time, ping, traceroute etc need this).
 401           Probably requires Linux 2.6+. If not selected, gettimeofday
 402           will be used instead (which gives wrong results if date/time
 403           is reset).
 404
 405 config BUSYBOX_CONFIG_IOCTL_HEX2STR_ERROR
 406         bool "Use ioctl names rather than hex values in error messages"
 407         default BUSYBOX_DEFAULT_IOCTL_HEX2STR_ERROR
 408         help
 409           Use ioctl names rather than hex values in error messages
 410           (e.g. VT_DISALLOCATE rather than 0x5608). If disabled this
 411           saves about 1400 bytes.
 412
 413 config BUSYBOX_CONFIG_FEATURE_HWIB
 414         bool "Support infiniband HW"
 415         default BUSYBOX_DEFAULT_FEATURE_HWIB
 416         help
 417           Support for printing infiniband addresses in
 418           network applets.
 419
 420 endmenu