Busybox添加自己的命令

Busybox生成后是按照busybox.links来生成链接也就是最后_install里面生成的所有软链接怎样去添加自定义命令并自动生成软连接呢，只需要该懂4个地方即可，假设我们要添加的命令为lsscsi,文件名为lsscsi.c添加在util-linux目录里然后按照以下4个地方做相应的修改。
以下所有的目录为相对路径相对于busybox的根目录:
第一个地方是include/usage.h是添加帮助的地方

 #define lspci_full_usage "\n\n" \
 "List all PCI devices" \
 "\n" \
 "\n -m Parseable output" \
 "\n -k Show driver" \

 #define lsusb_trivial_usage NOUSAGE_STR   // 这个是我们的添加的的，我这里去掉了直接留空
 #define lsusb_full_usage ""
 #define lsscsi_trivial_usage NOUSAGE_STR
#define lsscsi_full_usage ""

#if ENABLE_FEATURE_MAKEDEVS_LEAF
#define makedevs_trivial_usage \
"NAME TYPE MAJOR MINOR FIRST LAST [s]"

第二个地方添加 include/applets.h

IF_LSPCI(APPLET(lspci, _BB_DIR_SBIN, _BB_SUID_DROP))
IF_LSSCSI(APPLET(lsscsi, _BB_DIR_SBIN, _BB_SUID_DROP))   //这里指定软连接的路径
IF_LSUSB(APPLET(lsusb, _BB_DIR_SBIN, _BB_SUID_DROP))

第3个地方添加 util-linux/Config.in

config LSPCI
 bool "lspci"
 default n
 help
   lspci is a utility for displaying information about PCI buses in the
   system and devices connected to them.
   This version uses sysfs (/sys/bus/pci/devices) only.
config LSSCSI          #new add
 bool "lsscsi"
 default y            
 help
     lsscsi is a utility program for listing SCSI devices and hosts (HBAs)
   in the Linux operating system.
     For more information, please see docs/lsscsi.txt
config LSUSB
 bool "lsusb"
 default n
 help

第4个地方添加util-linux/Kbuild

lib-$(CONFIG_LSPCI) += lspci.o
lib-$(CONFIG_LSSCSI) += lsscsi.o //new add
lib-$(CONFIG_LSUSB) += lsusb.o