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 for /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_USE_TERMIOS
 119         bool "Use termios to manipulate the screen"
 120         default BUSYBOX_DEFAULT_FEATURE_USE_TERMIOS
 121         depends on BUSYBOX_CONFIG_MORE || BUSYBOX_CONFIG_TOP || BUSYBOX_CONFIG_POWERTOP
 122         help
 123           This option allows utilities such as 'more' and 'top' to determine
 124           the size of the screen. If you leave this disabled, your utilities
 125           that display things on the screen will be especially primitive and
 126           will be unable to determine the current screen size, and will be
 127           unable to move the cursor.
 128
 129 config BUSYBOX_CONFIG_FEATURE_EDITING
 130         bool "Command line editing"
 131         default BUSYBOX_DEFAULT_FEATURE_EDITING
 132         help
 133           Enable line editing (mainly for shell command line).
 134
 135 config BUSYBOX_CONFIG_FEATURE_EDITING_MAX_LEN
 136         int "Maximum length of input"
 137         range 128 8192
 138         default BUSYBOX_DEFAULT_FEATURE_EDITING_MAX_LEN
 139         depends on BUSYBOX_CONFIG_FEATURE_EDITING
 140         help
 141           Line editing code uses on-stack buffers for storage.
 142           You may want to decrease this parameter if your target machine
 143           benefits from smaller stack usage.
 144
 145 config BUSYBOX_CONFIG_FEATURE_EDITING_VI
 146         bool "vi-style line editing commands"
 147         default BUSYBOX_DEFAULT_FEATURE_EDITING_VI
 148         depends on BUSYBOX_CONFIG_FEATURE_EDITING
 149         help
 150           Enable vi-style line editing. In shells, this mode can be
 151           turned on and off with "set -o vi" and "set +o vi".
 152
 153 config BUSYBOX_CONFIG_FEATURE_EDITING_HISTORY
 154         int "History size"
 155         # Don't allow way too big values here, code uses fixed "char *history[N]" struct member
 156         range 0 9999
 157         default BUSYBOX_DEFAULT_FEATURE_EDITING_HISTORY
 158         depends on BUSYBOX_CONFIG_FEATURE_EDITING
 159         help
 160           Specify command history size (0 - disable).
 161
 162 config BUSYBOX_CONFIG_FEATURE_EDITING_SAVEHISTORY
 163         bool "History saving"
 164         default BUSYBOX_DEFAULT_FEATURE_EDITING_SAVEHISTORY
 165         depends on BUSYBOX_CONFIG_FEATURE_EDITING
 166         help
 167           Enable history saving in shells.
 168
 169 config BUSYBOX_CONFIG_FEATURE_EDITING_SAVE_ON_EXIT
 170         bool "Save history on shell exit, not after every command"
 171         default BUSYBOX_DEFAULT_FEATURE_EDITING_SAVE_ON_EXIT
 172         depends on BUSYBOX_CONFIG_FEATURE_EDITING_SAVEHISTORY
 173         help
 174           Save history on shell exit, not after every command.
 175
 176 config BUSYBOX_CONFIG_FEATURE_REVERSE_SEARCH
 177         bool "Reverse history search"
 178         default BUSYBOX_DEFAULT_FEATURE_REVERSE_SEARCH
 179         depends on BUSYBOX_CONFIG_FEATURE_EDITING
 180         help
 181           Enable readline-like Ctrl-R combination for reverse history search.
 182           Increases code by about 0.5k.
 183
 184 config BUSYBOX_CONFIG_FEATURE_TAB_COMPLETION
 185         bool "Tab completion"
 186         default BUSYBOX_DEFAULT_FEATURE_TAB_COMPLETION
 187         depends on BUSYBOX_CONFIG_FEATURE_EDITING
 188         help
 189           Enable tab completion.
 190
 191 config BUSYBOX_CONFIG_FEATURE_USERNAME_COMPLETION
 192         bool "Username completion"
 193         default BUSYBOX_DEFAULT_FEATURE_USERNAME_COMPLETION
 194         depends on BUSYBOX_CONFIG_FEATURE_TAB_COMPLETION
 195         help
 196           Enable username completion.
 197
 198 config BUSYBOX_CONFIG_FEATURE_EDITING_FANCY_PROMPT
 199         bool "Fancy shell prompts"
 200         default BUSYBOX_DEFAULT_FEATURE_EDITING_FANCY_PROMPT
 201         depends on BUSYBOX_CONFIG_FEATURE_EDITING
 202         help
 203           Setting this option allows for prompts to use things like \w and
 204           \$ and escape codes.
 205
 206 config BUSYBOX_CONFIG_FEATURE_EDITING_ASK_TERMINAL
 207         bool "Query cursor position from terminal"
 208         default BUSYBOX_DEFAULT_FEATURE_EDITING_ASK_TERMINAL
 209         depends on BUSYBOX_CONFIG_FEATURE_EDITING
 210         help
 211           Allow usage of "ESC [ 6 n" sequence. Terminal answers back with
 212           current cursor position. This information is used to make line
 213           editing more robust in some cases.
 214           If you are not sure whether your terminals respond to this code
 215           correctly, or want to save on code size (about 400 bytes),
 216           then do not turn this option on.
 217
 218 config BUSYBOX_CONFIG_LOCALE_SUPPORT
 219         bool "Enable locale support (system needs locale for this to work)"
 220         default BUSYBOX_DEFAULT_LOCALE_SUPPORT
 221         help
 222           Enable this if your system has locale support and you would like
 223           busybox to support locale settings.
 224
 225 config BUSYBOX_CONFIG_UNICODE_SUPPORT
 226         bool "Support Unicode"
 227         default BUSYBOX_DEFAULT_UNICODE_SUPPORT
 228         help
 229           This makes various applets aware that one byte is not
 230           one character on screen.
 231
 232           Busybox aims to eventually work correctly with Unicode displays.
 233           Any older encodings are not guaranteed to work.
 234           Probably by the time when busybox will be fully Unicode-clean,
 235           other encodings will be mainly of historic interest.
 236
 237 config BUSYBOX_CONFIG_UNICODE_USING_LOCALE
 238         bool "Use libc routines for Unicode (else uses internal ones)"
 239         default BUSYBOX_DEFAULT_UNICODE_USING_LOCALE
 240         depends on BUSYBOX_CONFIG_UNICODE_SUPPORT && BUSYBOX_CONFIG_LOCALE_SUPPORT
 241         help
 242           With this option on, Unicode support is implemented using libc
 243           routines. Otherwise, internal implementation is used.
 244           Internal implementation is smaller.
 245
 246 config BUSYBOX_CONFIG_FEATURE_CHECK_UNICODE_IN_ENV
 247         bool "Check $LC_ALL, $LC_CTYPE and $LANG environment variables"
 248         default BUSYBOX_DEFAULT_FEATURE_CHECK_UNICODE_IN_ENV
 249         depends on BUSYBOX_CONFIG_UNICODE_SUPPORT && !BUSYBOX_CONFIG_UNICODE_USING_LOCALE
 250         help
 251           With this option on, Unicode support is activated
 252           only if locale-related variables have the value of the form
 253           "xxxx.utf8"
 254
 255           Otherwise, Unicode support will be always enabled and active.
 256
 257 config BUSYBOX_CONFIG_SUBST_WCHAR
 258         int "Character code to substitute unprintable characters with"
 259         depends on BUSYBOX_CONFIG_UNICODE_SUPPORT
 260         default BUSYBOX_DEFAULT_SUBST_WCHAR
 261         help
 262           Typical values are 63 for '?' (works with any output device),
 263           30 for ASCII substitute control code,
 264           65533 (0xfffd) for Unicode replacement character.
 265
 266 config BUSYBOX_CONFIG_LAST_SUPPORTED_WCHAR
 267         int "Range of supported Unicode characters"
 268         depends on BUSYBOX_CONFIG_UNICODE_SUPPORT
 269         default BUSYBOX_DEFAULT_LAST_SUPPORTED_WCHAR
 270         help
 271           Any character with Unicode value bigger than this is assumed
 272           to be non-printable on output device. Many applets replace
 273           such characters with substitution character.
 274
 275           The idea is that many valid printable Unicode chars
 276           nevertheless are not displayed correctly. Think about
 277           combining charachers, double-wide hieroglyphs, obscure
 278           characters in dozens of ancient scripts...
 279           Many terminals, terminal emulators, xterms etc will fail
 280           to handle them correctly. Choose the smallest value
 281           which suits your needs.
 282
 283           Typical values are:
 284           126 - ASCII only
 285           767 (0x2ff) - there are no combining chars in [0..767] range
 286                         (the range includes Latin 1, Latin Ext. A and B),
 287                         code is ~700 bytes smaller for this case.
 288           4351 (0x10ff) - there are no double-wide chars in [0..4351] range,
 289                         code is ~300 bytes smaller for this case.
 290           12799 (0x31ff) - nearly all non-ideographic characters are
 291                         available in [0..12799] range, including
 292                         East Asian scripts like katakana, hiragana, hangul,
 293                         bopomofo...
 294           0 - off, any valid printable Unicode character will be printed.
 295
 296 config BUSYBOX_CONFIG_UNICODE_COMBINING_WCHARS
 297         bool "Allow zero-width Unicode characters on output"
 298         default BUSYBOX_DEFAULT_UNICODE_COMBINING_WCHARS
 299         depends on BUSYBOX_CONFIG_UNICODE_SUPPORT
 300         help
 301           With this option off, any Unicode char with width of 0
 302           is substituted on output.
 303
 304 config BUSYBOX_CONFIG_UNICODE_WIDE_WCHARS
 305         bool "Allow wide Unicode characters on output"
 306         default BUSYBOX_DEFAULT_UNICODE_WIDE_WCHARS
 307         depends on BUSYBOX_CONFIG_UNICODE_SUPPORT
 308         help
 309           With this option off, any Unicode char with width > 1
 310           is substituted on output.
 311
 312 config BUSYBOX_CONFIG_UNICODE_BIDI_SUPPORT
 313         bool "Bidirectional character-aware line input"
 314         default BUSYBOX_DEFAULT_UNICODE_BIDI_SUPPORT
 315         depends on BUSYBOX_CONFIG_UNICODE_SUPPORT && !BUSYBOX_CONFIG_UNICODE_USING_LOCALE
 316         help
 317           With this option on, right-to-left Unicode characters
 318           are treated differently on input (e.g. cursor movement).
 319
 320 config BUSYBOX_CONFIG_UNICODE_NEUTRAL_TABLE
 321         bool "In bidi input, support non-ASCII neutral chars too"
 322         default BUSYBOX_DEFAULT_UNICODE_NEUTRAL_TABLE
 323         depends on BUSYBOX_CONFIG_UNICODE_BIDI_SUPPORT
 324         help
 325           In most cases it's enough to treat only ASCII non-letters
 326           (i.e. punctuation, numbers and space) as characters
 327           with neutral directionality.
 328           With this option on, more extensive (and bigger) table
 329           of neutral chars will be used.
 330
 331 config BUSYBOX_CONFIG_UNICODE_PRESERVE_BROKEN
 332         bool "Make it possible to enter sequences of chars which are not Unicode"
 333         default BUSYBOX_DEFAULT_UNICODE_PRESERVE_BROKEN
 334         depends on BUSYBOX_CONFIG_UNICODE_SUPPORT
 335         help
 336           With this option on, on line-editing input (such as used by shells)
 337           invalid UTF-8 bytes are not substituted with the selected
 338           substitution character.
 339           For example, this means that entering 'l', 's', ' ', 0xff, [Enter]
 340           at shell prompt will list file named 0xff (single char name
 341           with char value 255), not file named '?'.
 342
 343 config BUSYBOX_CONFIG_FEATURE_NON_POSIX_CP
 344         bool "Non-POSIX, but safer, copying to special nodes"
 345         default BUSYBOX_DEFAULT_FEATURE_NON_POSIX_CP
 346         help
 347           With this option, "cp file symlink" will delete symlink
 348           and create a regular file. This does not conform to POSIX,
 349           but prevents a symlink attack.
 350           Similarly, "cp file device" will not send file's data
 351           to the device. (To do that, use "cat file >device")
 352
 353 config BUSYBOX_CONFIG_FEATURE_VERBOSE_CP_MESSAGE
 354         bool "Give more precise messages when copy fails (cp, mv etc)"
 355         default BUSYBOX_DEFAULT_FEATURE_VERBOSE_CP_MESSAGE
 356         help
 357           Error messages with this feature enabled:
 358             $ cp file /does_not_exist/file
 359             cp: cannot create '/does_not_exist/file': Path does not exist
 360             $ cp file /vmlinuz/file
 361             cp: cannot stat '/vmlinuz/file': Path has non-directory component
 362           If this feature is not enabled, they will be, respectively:
 363             cp: cannot create '/does_not_exist/file': No such file or directory
 364             cp: cannot stat '/vmlinuz/file': Not a directory
 365           This will cost you ~60 bytes.
 366
 367 config BUSYBOX_CONFIG_FEATURE_USE_SENDFILE
 368         bool "Use sendfile system call"
 369         default BUSYBOX_DEFAULT_FEATURE_USE_SENDFILE
 370         select BUSYBOX_CONFIG_PLATFORM_LINUX
 371         help
 372           When enabled, busybox will use the kernel sendfile() function
 373           instead of read/write loops to copy data between file descriptors
 374           (for example, cp command does this a lot).
 375           If sendfile() doesn't work, copying code falls back to read/write
 376           loop. sendfile() was originally implemented for faster I/O
 377           from files to sockets, but since Linux 2.6.33 it was extended
 378           to work for many more file types.
 379
 380 config BUSYBOX_CONFIG_FEATURE_COPYBUF_KB
 381         int "Copy buffer size, in kilobytes"
 382         range 1 1024
 383         default BUSYBOX_DEFAULT_FEATURE_COPYBUF_KB
 384         help
 385           Size of buffer used by cp, mv, install, wget etc.
 386           Buffers which are 4 kb or less will be allocated on stack.
 387           Bigger buffers will be allocated with mmap, with fallback to 4 kb
 388           stack buffer if mmap fails.
 389
 390 config BUSYBOX_CONFIG_FEATURE_SKIP_ROOTFS
 391         bool "Skip rootfs in mount table"
 392         default BUSYBOX_DEFAULT_FEATURE_SKIP_ROOTFS
 393         help
 394           Ignore rootfs entry in mount table.
 395
 396           In Linux, kernel has a special filesystem, rootfs, which is initially
 397           mounted on /. It contains initramfs data, if kernel is configured
 398           to have one. Usually, another file system is mounted over / early
 399           in boot process, and therefore most tools which manipulate
 400           mount table, such as df, will skip rootfs entry.
 401
 402           However, some systems do not mount anything on /.
 403           If you need to configure busybox for one of these systems,
 404           you may find it useful to turn this option off to make df show
 405           initramfs statistics.
 406
 407           Otherwise, choose Y.
 408
 409 config BUSYBOX_CONFIG_MONOTONIC_SYSCALL
 410         bool "Use clock_gettime(CLOCK_MONOTONIC) syscall"
 411         default BUSYBOX_DEFAULT_MONOTONIC_SYSCALL
 412         select BUSYBOX_CONFIG_PLATFORM_LINUX
 413         help
 414           Use clock_gettime(CLOCK_MONOTONIC) syscall for measuring
 415           time intervals (time, ping, traceroute etc need this).
 416           Probably requires Linux 2.6+. If not selected, gettimeofday
 417           will be used instead (which gives wrong results if date/time
 418           is reset).
 419
 420 config BUSYBOX_CONFIG_IOCTL_HEX2STR_ERROR
 421         bool "Use ioctl names rather than hex values in error messages"
 422         default BUSYBOX_DEFAULT_IOCTL_HEX2STR_ERROR
 423         help
 424           Use ioctl names rather than hex values in error messages
 425           (e.g. VT_DISALLOCATE rather than 0x5608). If disabled this
 426           saves about 1400 bytes.
 427
 428 config BUSYBOX_CONFIG_FEATURE_HWIB
 429         bool "Support infiniband HW"
 430         default BUSYBOX_DEFAULT_FEATURE_HWIB
 431         help
 432           Support for printing infiniband addresses in
 433           network applets.
 434
 435 endmenu