為了檢測固定網線口的拔插訊息，在busybox裡配置了ifplugd
ptions:
-n don't daemonize
-s don't log to syslog
-i iface inte***ce
-f/-f treat link detection error as link down/link up
(otherwise exit on error)
-a don't up inte***ce at each link probe
-m monitor creation/destruction of inte***ce
(otherwise it must exist)
-r prog script to run
-x arg extra argument for script
-i don't exit on nonzero exit code from script
-p don't run script on daemon startup
-q don't run script on daemon quit
-l run script on startup even if no cable is detected
-t secs poll time in seconds
-u secs delay before running script after link up
-d secs delay after link down
-m mode api mode (mii, priv, ethtool, wlan, iff, auto)
-k kill running daemon
系統起來後執行ifplugd -ni -i eth0 -r /etc/network/if.sh會在當前shell啟動ifplugd並檢測網口狀態
# ifplugd -ni -i eth0 -r /etc/network/if.sh
ifplugd(eth0): started: busybox v1.16.1 (2011-01-28 11:42:48 hkt)
ifplugd(eth0): using siocethtool detection mode
ifplugd(eth0): link is up
ifplugd(eth0): executing '/etc/network/if.sh eth0 up'
ifplugd(eth0): exit code: 0
gmac:eth0: link is down
ifplugd(eth0): link is down
ifplugd(eth0): executing '/etc/network/if.sh eth0 down'
ifplugd(eth0): exit code: 0
gmac:eth0 : link is up
ifplugd(eth0): link is up
ifplugd(eth0): executing '/etc/network/if.sh eth0 up'
ifplugd(eth0): exit code: 0
去掉-n會以daemon方式後台執行。
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