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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