linux eth hotplug,ifplugd检测eth0拔插消息

ptions:
-n              Don’t daemonize
-s              Don’t log to syslog
-i IFACE        Interface
-f/-F           Treat link detection error as link down/link up
(otherwise exit on error)
-a              Don’t up interface at each link probe
-M              Monitor creation/destruction of interface
(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

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’