基于I.xm6q，移植lsof工具
近日，在I.xm6q上处理录像文件。而已移植的系统缺少lsof命令,难以准确知道系统当前打开的录像有哪些。若未关闭录像文件，对卸载与格式化SD卡有一定影响。
经查阅资料，在不重新制作busybox的情况下，直接下载源码，交叉编译，移植lsof命令。步骤如下：
- 下载源码路径：http://www.mirrorservice.org/sites/lsof.itap.purdue.edu/pub/tools/unix/lsof/
- 下载源码包：lsof_4.91.tar.gz
- 将下载好的lsof_4.91.tar.gz，移植到Linux开发系统中，并解压源包：tar -xvf lsof_4.91.tar.gz
- 进入解压目录，检测源码包lsof_4.91_src.tar是否完好无损
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- 解压目录内有"README.lsof_4.91"文件，文件内容有MD5码，用于检验文件是否完好无损。
- 开发环境中，对下载的lsof_4.91_src.tar进行MD5校验.
- 若两个MD5一样，则可以交叉编译，移植。否则，建议重新下载
5.解压lsof_4.91_src.tar: tar -xvf lsof_4.91_src.tar
6.进入解压后的lsof_4.91_src目录
7.交叉编译前，参数配置：LINUX_KERNEL=/opt/fsl-imx/4.1.15-2.1.0/linux-imx ./Configure linux
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- 其中：/opt/fsl-imx/4.1.15-2.1.0/linux-imx是Ixm6q系统Kernel源码路径
8.修改Makefile文件
- 修改CC交叉编译链即可，修改内容如下：
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ARCH = arm CC = /opt/fsl-imx/4.1.15-2.1.0/fb_back/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-gcc -march=armv7-a -mfpu=neon -mfloat-abi=hard -mcpu=cortex-a9 --sysroot=/opt/fsl-imx/4.1.15-2.1.0/fb/sysroots/cortexa9hf-neon-poky-linux-gnueabi
9.编译源码，生成lsof命令：make
10.移植：将交叉编译好的lsof命令移植到I.xm6q开发板上。
11.移植测试：lsof --help
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root@imx6qsabreauto:~# lsof --help lsof: illegal option character: - lsof 4.91 latest revision: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/ latest FAQ: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/FAQ latest man page: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/lsof_man usage: [-?abhKlnNoOPRtUvVX] [+|-c c] [+|-d s] [+D D] [+|-E] [+|-e s] [+|-f[gG]] [-F [f]] [-g [s]] [-i [i]] [+|-L [l]] [+m [m]] [+|-M] [-o [o]] [-p s] [+|-r [t]] [-s [p:s]] [-S [t]] [-T [t]] [-u s] [+|-w] [-x [fl]] [--] [names] Defaults in parentheses; comma-separated set (s) items; dash-separated ranges. -?|-h list help -a AND selections (OR) -b avoid kernel blocks -c c cmd c ^c /c/[bix] +c w COMMAND width (9) +d s dir s files -d s select by FD set +D D dir D tree *SLOW?* +|-e s exempt s *RISKY* -i select IPv[46] files -K [i] list|(i)gn tasKs -l list UID numbers -n no host names -N select NFS files -o list file offset -O no overhead *RISKY* -P no port names -R list paRent PID -s list file size -t terse listing -T disable TCP/TPI info -U select Unix socket -v list version info -V verbose search +|-w Warnings (-) -X skip TCP&UDP* files -- end option scan -E display endpoint info +E display endpoint info and files +f|-f +filesystem or -file names +|-f[gG] flaGs -F [f] select fields; -F? for help +|-L [l] list (+) suppress (-) link counts < l (0 = all; default = 0) +m [m] use|create mount supplement +|-M portMap registration (-) -o o o 0t offset digits (8) -p s exclude(^)|select PIDs -S [t] t second stat timeout (15) -T qs TCP/TPI Q,St (s) info -g [s] exclude(^)|select and print process group IDs -i i select by IPv[46] address: [46][proto][@host|addr][:svc_list|port_list] +|-r [t[m<fmt>]] repeat every t seconds (15); + until no files, - forever. An optional suffix to t is m<fmt>; m must separate t from <fmt> and <fmt> is an strftime(3) format for the marker line. -s p:s exclude(^)|select protocol (p = TCP|UDP) states by name(s). -u s exclude(^)|select login|UID set s -x [fl] cross over +d|+D File systems or symbolic Links names select named files or files on named file systems Only root can list all files, but anyone can list socket files. /dev warnings disabled; kernel ID check enabled.
- 有相关内容，则表示移植成功
12.使用教程:参考菜鸟教程https://www.runoob.com/w3cnote/linux-check-port-usage.html
