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- # DO NOT EDIT. This file is generated from Config.src
- #
- # For a description of the syntax of this configuration file,
- # see scripts/kbuild/config-language.txt.
- #
- menu "Busybox Library Tuning"
- config BUSYBOX_FEATURE_USE_BSS_TAIL
- bool "Use the end of BSS page"
- default n
- help
- Attempt to reclaim a small unused part of BSS.
- Executables have the following parts:
- = read-only executable code and constants, also known as "text"
- = read-write data
- = non-initialized (zeroed on demand) data, also known as "bss"
- At link time, "text" is padded to a full page. At runtime, all "text"
- pages are mapped RO and executable.
- "Data" starts on the next page boundary, but is not padded
- to a full page at the end. "Bss" starts wherever "data" ends.
- At runtime, "data" pages are mapped RW and they are file-backed
- (this includes a small portion of "bss" which may live in the last
- partial page of "data").
- Pages which are fully in "bss" are mapped to anonymous memory.
- "Bss" end is usually not page-aligned. There is an unused space
- in the last page. Linker marks its start with the "_end" symbol.
- This option will attempt to use that space for bb_common_bufsiz1[]
- array. If it fits after _end, it will be used, and COMMON_BUFSIZE
- will be enlarged from its guaranteed minimum size of 1 kbyte.
- This may require recompilation a second time, since value of _end
- is known only after final link.
- If you are getting a build error like this:
- appletlib.c:(.text.main+0xd): undefined reference to '_end'
- disable this option.
- config BUSYBOX_FLOAT_DURATION
- bool "Enable fractional duration arguments"
- default y
- help
- Allow sleep N.NNN, top -d N.NNN etc.
- config BUSYBOX_FEATURE_RTMINMAX
- bool "Support RTMIN[+n] and RTMAX[-n] signal names"
- default y
- help
- Support RTMIN[+n] and RTMAX[-n] signal names
- in kill, killall etc. This costs ~250 bytes.
- config BUSYBOX_FEATURE_RTMINMAX_USE_LIBC_DEFINITIONS
- bool "Use the definitions of SIGRTMIN/SIGRTMAX provided by libc"
- default y
- depends on BUSYBOX_FEATURE_RTMINMAX
- help
- Some C libraries reserve a few real-time signals for internal
- use, and adjust the values of SIGRTMIN/SIGRTMAX seen by
- applications accordingly. Saying yes here means that a signal
- name RTMIN+n will be interpreted according to the libc definition
- of SIGRTMIN, and not the raw definition provided by the kernel.
- This behavior matches "kill -l RTMIN+n" from bash.
- config BUSYBOX_PASSWORD_MINLEN
- int "Minimum password length"
- default 6
- range 5 32
- help
- Minimum allowable password length.
- config BUSYBOX_MD5_SMALL
- int "MD5: Trade bytes for speed (0:fast, 3:slow)"
- default 1
- 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 BUSYBOX_SHA3_SMALL
- int "SHA3: Trade bytes for speed (0:fast, 1:slow)"
- default 1
- 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 BUSYBOX_FEATURE_FAST_TOP
- bool "Faster /proc scanning code (+100 bytes)"
- default y
- help
- This option makes top (and ps) ~20% faster (or 20% less CPU hungry),
- but code size is slightly bigger.
- config BUSYBOX_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 BUSYBOX_FEATURE_ETC_SERVICES
- bool "Consult /etc/services even for well-known ports"
- default n
- help
- Look up e.g. "telnet" and "http" in /etc/services file
- instead of assuming ports 23 and 80.
- This is almost never necessary (everybody uses standard ports),
- and it makes sense to avoid reading this file.
- If you disable this option, in the cases where port is explicitly
- specified as a service name (e.g. "telnet HOST PORTNAME"),
- it will still be looked up in /etc/services.
- config BUSYBOX_FEATURE_USE_TERMIOS
- bool "Use termios to manipulate the screen"
- default y
- depends on BUSYBOX_MORE || BUSYBOX_TOP || BUSYBOX_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 BUSYBOX_FEATURE_EDITING
- bool "Command line editing"
- default y
- help
- Enable line editing (mainly for shell command line).
- config BUSYBOX_FEATURE_EDITING_MAX_LEN
- int "Maximum length of input"
- range 128 8192
- default 1024
- depends on BUSYBOX_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 BUSYBOX_FEATURE_EDITING_VI
- bool "vi-style line editing commands"
- default n
- depends on BUSYBOX_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 BUSYBOX_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 BUSYBOX_FEATURE_EDITING
- help
- Specify command history size (0 - disable).
- config BUSYBOX_FEATURE_EDITING_SAVEHISTORY
- bool "History saving"
- default y
- depends on BUSYBOX_FEATURE_EDITING
- help
- Enable history saving in shells.
- config BUSYBOX_FEATURE_EDITING_SAVE_ON_EXIT
- bool "Save history on shell exit, not after every command"
- default n
- depends on BUSYBOX_FEATURE_EDITING_SAVEHISTORY
- help
- Save history on shell exit, not after every command.
- config BUSYBOX_FEATURE_REVERSE_SEARCH
- bool "Reverse history search"
- default y
- depends on BUSYBOX_FEATURE_EDITING_SAVEHISTORY
- help
- Enable readline-like Ctrl-R combination for reverse history search.
- Increases code by about 0.5k.
- config BUSYBOX_FEATURE_TAB_COMPLETION
- bool "Tab completion"
- default y
- depends on BUSYBOX_FEATURE_EDITING
- help
- Enable tab completion.
- config BUSYBOX_FEATURE_USERNAME_COMPLETION
- bool "Username completion"
- default n
- depends on BUSYBOX_FEATURE_TAB_COMPLETION
- help
- Enable username completion.
- config BUSYBOX_FEATURE_EDITING_FANCY_PROMPT
- bool "Fancy shell prompts"
- default y
- depends on BUSYBOX_FEATURE_EDITING
- help
- Setting this option allows for prompts to use things like \w and
- \$ and escape codes.
- config BUSYBOX_FEATURE_EDITING_WINCH
- bool "Enable automatic tracking of window size changes"
- default y
- depends on BUSYBOX_FEATURE_EDITING
- config BUSYBOX_FEATURE_EDITING_ASK_TERMINAL
- bool "Query cursor position from terminal"
- default n
- depends on BUSYBOX_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 BUSYBOX_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 BUSYBOX_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 BUSYBOX_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 BUSYBOX_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 BUSYBOX_MONOTONIC_SYSCALL
- bool "Use clock_gettime(CLOCK_MONOTONIC) syscall"
- default y
- select BUSYBOX_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 BUSYBOX_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 BUSYBOX_FEATURE_HWIB
- bool "Support infiniband HW"
- default n
- help
- Support for printing infiniband addresses in
- network applets.
- endmenu
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