| 1 | #
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| 2 | # For a description of the syntax of this configuration file,
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| 3 | # see scripts/kbuild/config-language.txt.
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| 4 | #
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| 5 |
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| 6 | menu "Busybox Library Tuning"
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| 7 |
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| 8 | INSERT
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| 9 |
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| 10 | config PASSWORD_MINLEN
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| 11 | int "Minimum password length"
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| 12 | default 6
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| 13 | range 5 32
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| 14 | help
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| 15 | Minimum allowable password length.
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| 16 |
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| 17 | config MD5_SMALL
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| 18 | int "MD5: Trade bytes for speed (0:fast, 3:slow)"
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| 19 | default 1
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| 20 | range 0 3
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| 21 | help
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| 22 | Trade binary size versus speed for the md5sum algorithm.
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| 23 | Approximate values running uClibc and hashing
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| 24 | linux-2.4.4.tar.bz2 were:
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| 25 | user times (sec) text size (386)
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| 26 | 0 (fastest) 1.1 6144
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| 27 | 1 1.4 5392
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| 28 | 2 3.0 5088
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| 29 | 3 (smallest) 5.1 4912
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| 30 |
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| 31 | config SHA3_SMALL
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| 32 | int "SHA3: Trade bytes for speed (0:fast, 1:slow)"
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| 33 | default 1
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| 34 | range 0 1
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| 35 | help
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| 36 | Trade binary size versus speed for the sha3sum algorithm.
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| 37 | SHA3_SMALL=0 compared to SHA3_SMALL=1 (approximate):
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| 38 | 64-bit x86: +270 bytes of code, 45% faster
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| 39 | 32-bit x86: +450 bytes of code, 75% faster
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| 40 |
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| 41 | config FEATURE_FAST_TOP
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| 42 | bool "Faster /proc scanning code (+100 bytes)"
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| 43 | default y
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| 44 | help
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| 45 | This option makes top (and ps) ~20% faster (or 20% less CPU hungry),
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| 46 | but code size is slightly bigger.
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| 47 |
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| 48 | config FEATURE_ETC_NETWORKS
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| 49 | bool "Support for /etc/networks"
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| 50 | default n
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| 51 | help
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| 52 | Enable support for network names in /etc/networks. This is
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| 53 | a rarely used feature which allows you to use names
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| 54 | instead of IP/mask pairs in route command.
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| 55 |
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| 56 | config FEATURE_USE_TERMIOS
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| 57 | bool "Use termios to manipulate the screen"
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| 58 | default y
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| 59 | depends on MORE || TOP || POWERTOP
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| 60 | help
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| 61 | This option allows utilities such as 'more' and 'top' to determine
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| 62 | the size of the screen. If you leave this disabled, your utilities
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| 63 | that display things on the screen will be especially primitive and
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| 64 | will be unable to determine the current screen size, and will be
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| 65 | unable to move the cursor.
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| 66 |
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| 67 | config FEATURE_EDITING
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| 68 | bool "Command line editing"
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| 69 | default y
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| 70 | help
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| 71 | Enable line editing (mainly for shell command line).
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| 72 |
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| 73 | config FEATURE_EDITING_MAX_LEN
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| 74 | int "Maximum length of input"
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| 75 | range 128 8192
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| 76 | default 1024
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| 77 | depends on FEATURE_EDITING
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| 78 | help
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| 79 | Line editing code uses on-stack buffers for storage.
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| 80 | You may want to decrease this parameter if your target machine
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| 81 | benefits from smaller stack usage.
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| 82 |
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| 83 | config FEATURE_EDITING_VI
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| 84 | bool "vi-style line editing commands"
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| 85 | default n
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| 86 | depends on FEATURE_EDITING
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| 87 | help
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| 88 | Enable vi-style line editing. In shells, this mode can be
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| 89 | turned on and off with "set -o vi" and "set +o vi".
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| 90 |
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| 91 | config FEATURE_EDITING_HISTORY
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| 92 | int "History size"
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| 93 | # Don't allow way too big values here, code uses fixed "char *history[N]" struct member
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| 94 | range 0 9999
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| 95 | default 255
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| 96 | depends on FEATURE_EDITING
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| 97 | help
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| 98 | Specify command history size (0 - disable).
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| 99 |
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| 100 | config FEATURE_EDITING_SAVEHISTORY
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| 101 | bool "History saving"
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| 102 | default y
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| 103 | depends on FEATURE_EDITING
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| 104 | help
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| 105 | Enable history saving in shells.
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| 106 |
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| 107 | config FEATURE_EDITING_SAVE_ON_EXIT
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| 108 | bool "Save history on shell exit, not after every command"
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| 109 | default n
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| 110 | depends on FEATURE_EDITING_SAVEHISTORY
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| 111 | help
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| 112 | Save history on shell exit, not after every command.
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| 113 |
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| 114 | config FEATURE_REVERSE_SEARCH
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| 115 | bool "Reverse history search"
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| 116 | default y
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| 117 | depends on FEATURE_EDITING_SAVEHISTORY
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| 118 | help
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| 119 | Enable readline-like Ctrl-R combination for reverse history search.
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| 120 | Increases code by about 0.5k.
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| 121 |
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| 122 | config FEATURE_TAB_COMPLETION
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| 123 | bool "Tab completion"
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| 124 | default y
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| 125 | depends on FEATURE_EDITING
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| 126 | help
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| 127 | Enable tab completion.
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| 128 |
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| 129 | config FEATURE_USERNAME_COMPLETION
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| 130 | bool "Username completion"
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| 131 | default n
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| 132 | depends on FEATURE_TAB_COMPLETION
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| 133 | help
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| 134 | Enable username completion.
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| 135 |
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| 136 | config FEATURE_EDITING_FANCY_PROMPT
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| 137 | bool "Fancy shell prompts"
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| 138 | default y
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| 139 | depends on FEATURE_EDITING
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| 140 | help
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| 141 | Setting this option allows for prompts to use things like \w and
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| 142 | \$ and escape codes.
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| 143 |
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| 144 | config FEATURE_EDITING_ASK_TERMINAL
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| 145 | bool "Query cursor position from terminal"
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| 146 | default n
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| 147 | depends on FEATURE_EDITING
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| 148 | help
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| 149 | Allow usage of "ESC [ 6 n" sequence. Terminal answers back with
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| 150 | current cursor position. This information is used to make line
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| 151 | editing more robust in some cases.
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| 152 | If you are not sure whether your terminals respond to this code
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| 153 | correctly, or want to save on code size (about 400 bytes),
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| 154 | then do not turn this option on.
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| 155 |
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| 156 | config FEATURE_NON_POSIX_CP
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| 157 | bool "Non-POSIX, but safer, copying to special nodes"
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| 158 | default y
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| 159 | help
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| 160 | With this option, "cp file symlink" will delete symlink
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| 161 | and create a regular file. This does not conform to POSIX,
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| 162 | but prevents a symlink attack.
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| 163 | Similarly, "cp file device" will not send file's data
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| 164 | to the device. (To do that, use "cat file >device")
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| 165 |
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| 166 | config FEATURE_VERBOSE_CP_MESSAGE
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| 167 | bool "Give more precise messages when copy fails (cp, mv etc)"
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| 168 | default n
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| 169 | help
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| 170 | Error messages with this feature enabled:
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| 171 | $ cp file /does_not_exist/file
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| 172 | cp: cannot create '/does_not_exist/file': Path does not exist
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| 173 | $ cp file /vmlinuz/file
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| 174 | cp: cannot stat '/vmlinuz/file': Path has non-directory component
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| 175 | If this feature is not enabled, they will be, respectively:
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| 176 | cp: cannot create '/does_not_exist/file': No such file or directory
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| 177 | cp: cannot stat '/vmlinuz/file': Not a directory
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| 178 | This will cost you ~60 bytes.
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| 179 |
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| 180 | config FEATURE_COPYBUF_KB
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| 181 | int "Copy buffer size, in kilobytes"
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| 182 | range 1 1024
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| 183 | default 4
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| 184 | help
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| 185 | Size of buffer used by cp, mv, install, wget etc.
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| 186 | Buffers which are 4 kb or less will be allocated on stack.
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| 187 | Bigger buffers will be allocated with mmap, with fallback to 4 kb
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| 188 | stack buffer if mmap fails.
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| 189 |
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| 190 | config FEATURE_SKIP_ROOTFS
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| 191 | bool "Skip rootfs in mount table"
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| 192 | default y
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| 193 | help
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| 194 | Ignore rootfs entry in mount table.
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| 195 |
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| 196 | In Linux, kernel has a special filesystem, rootfs, which is initially
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| 197 | mounted on /. It contains initramfs data, if kernel is configured
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| 198 | to have one. Usually, another file system is mounted over / early
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| 199 | in boot process, and therefore most tools which manipulate
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| 200 | mount table, such as df, will skip rootfs entry.
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| 201 |
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| 202 | However, some systems do not mount anything on /.
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| 203 | If you need to configure busybox for one of these systems,
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| 204 | you may find it useful to turn this option off to make df show
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| 205 | initramfs statistics.
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| 206 |
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| 207 | Otherwise, choose Y.
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| 208 |
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| 209 | config MONOTONIC_SYSCALL
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| 210 | bool "Use clock_gettime(CLOCK_MONOTONIC) syscall"
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| 211 | default n
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| 212 | select PLATFORM_LINUX
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| 213 | help
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| 214 | Use clock_gettime(CLOCK_MONOTONIC) syscall for measuring
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| 215 | time intervals (time, ping, traceroute etc need this).
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| 216 | Probably requires Linux 2.6+. If not selected, gettimeofday
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| 217 | will be used instead (which gives wrong results if date/time
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| 218 | is reset).
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| 219 |
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| 220 | config IOCTL_HEX2STR_ERROR
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| 221 | bool "Use ioctl names rather than hex values in error messages"
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| 222 | default y
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| 223 | help
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| 224 | Use ioctl names rather than hex values in error messages
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| 225 | (e.g. VT_DISALLOCATE rather than 0x5608). If disabled this
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| 226 | saves about 1400 bytes.
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| 227 |
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| 228 | config FEATURE_HWIB
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| 229 | bool "Support infiniband HW"
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| 230 | default y
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| 231 | help
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| 232 | Support for printing infiniband addresses in
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| 233 | network applets.
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| 234 |
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| 235 | endmenu
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