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#
# For a description of the syntax of this configuration file,
# see scripts/kbuild/config-language.txt.
#
menu "Busybox Library Tuning"
INSERT
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:
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 for /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_USE_TERMIOS
bool "Use termios to manipulate the screen"
default y
depends on MORE || TOP || POWERTOP
help
This option allows utilities such as 'more' and 'top' to determine
the size of the screen. If you leave this disabled, your utilities
that display things on the screen will be especially primitive and
will be unable to determine the current screen size, and will be
unable to move the cursor.
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_SAVEHISTORY
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
help
Enable tab completion.
config FEATURE_USERNAME_COMPLETION
bool "Username completion"
default n
depends on FEATURE_TAB_COMPLETION
help
Enable username 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_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 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_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.
endmenu
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