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16.16 - 附录：lsof工具的使用.md

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附录：lsof工具的使用

Linux平台提供了lsof工具可以查看某个进程打开的文件句柄。可以用于跟踪swoole的工作进程所有打开的socket、file、资源。

使用方法

lsof -p [进程ID]

运行结果

lsof -p 26821
lsof: WARNING: can't stat() tracefs file system /sys/kernel/debug/tracing
      Output information may be incomplete.
COMMAND   PID USER   FD      TYPE             DEVICE SIZE/OFF    NODE NAME
php     26821  htf  cwd       DIR                8,4     4096 5375979 /home/htf/workspace/swoole/examples
php     26821  htf  rtd       DIR                8,4     4096       2 /
php     26821  htf  txt       REG                8,4 24192400 6160666 /opt/php/php-5.6/bin/php
php     26821  htf  DEL       REG                0,5          7204965 /dev/zero
php     26821  htf  DEL       REG                0,5          7204960 /dev/zero
php     26821  htf  DEL       REG                0,5          7204958 /dev/zero
php     26821  htf  DEL       REG                0,5          7204957 /dev/zero
php     26821  htf  DEL       REG                0,5          7204945 /dev/zero
php     26821  htf  mem       REG                8,4   761912 6160770 /opt/php/php-5.6/lib/php/extensions/debug-zts-20131226/gd.so
php     26821  htf  mem       REG                8,4  2769230 2757968 /usr/local/lib/libcrypto.so.1.1
php     26821  htf  mem       REG                8,4   162632 6322346 /lib/x86_64-linux-gnu/ld-2.23.so
php     26821  htf  DEL       REG                0,5          7204959 /dev/zero
php     26821  htf    0u      CHR             136,20      0t0      23 /dev/pts/20
php     26821  htf    1u      CHR             136,20      0t0      23 /dev/pts/20
php     26821  htf    2u      CHR             136,20      0t0      23 /dev/pts/20
php     26821  htf    3r      CHR                1,9      0t0      11 /dev/urandom
php     26821  htf    4u     IPv4            7204948      0t0     TCP *:9501 (LISTEN)
php     26821  htf    5u     IPv4            7204949      0t0     UDP *:9502 
php     26821  htf    6u     IPv6            7204950      0t0     TCP *:9503 (LISTEN)
php     26821  htf    7u     IPv6            7204951      0t0     UDP *:9504 
php     26821  htf    8u     IPv4            7204952      0t0     TCP localhost:8000 (LISTEN)
php     26821  htf    9u     unix 0x0000000000000000      0t0 7204953 type=DGRAM
php     26821  htf   10u     unix 0x0000000000000000      0t0 7204954 type=DGRAM
php     26821  htf   11u     unix 0x0000000000000000      0t0 7204955 type=DGRAM
php     26821  htf   12u     unix 0x0000000000000000      0t0 7204956 type=DGRAM
php     26821  htf   13u  a_inode               0,11        0    9043 [eventfd]
php     26821  htf   14u     unix 0x0000000000000000      0t0 7204961 type=DGRAM
php     26821  htf   15u     unix 0x0000000000000000      0t0 7204962 type=DGRAM
php     26821  htf   16u     unix 0x0000000000000000      0t0 7204963 type=DGRAM
php     26821  htf   17u     unix 0x0000000000000000      0t0 7204964 type=DGRAM
php     26821  htf   18u  a_inode               0,11        0    9043 [eventpoll]
php     26821  htf   19u  a_inode               0,11        0    9043 [signalfd]
php     26821  htf   20u  a_inode               0,11        0    9043 [eventpoll]
php     26821  htf   22u     IPv4            7452776      0t0     TCP localhost:9501->localhost:59056 (ESTABLISHED)
  • so文件是进程加载的动态连接库
  • IPv4/IPv6 TCP (LISTEN) 是服务器监听的端口
  • UDP 是服务器监听的UDP端口
  • unix type=DGRAM 时是进程创建的UnixSocket管道
  • IPv4 (ESTABLISHED) 表示连接到服务器的TCP客户端，包含了客户端的IP和PORT，以及状态(ESTABLISHED)
  • 9u / 10u 表示该文件句柄的fd值(文件描述符)
  • 其他更多信息可以参考lsof的手册