如何一接入WIFI网卡，就自动执行wpa_supplicant

c.2 一接入WIFI网卡，就自动执行wpa_supplicant等
参考第2期视频第28课热拔插
cat /etc/mdev.conf 
wlan0 0:0 777 * /sbin/auto_wifi.sh


cat /sbin/auto_wifi.sh
#!/bin/sh
if [ $ACTION = "add" ];
then                                              
   wpa_supplicant -B -c/etc/wpa_wpa2.conf  -iwlan0
   wpa_cli -a/sbin/wpa_action.sh -B
else                     
   killall wpa_supplicant
   killall wpa_cli 
   killall dhclient
fi


chmod +x /sbin/auto_wifi.sh 


    一连接上WIFI AP, 就自动执行dhclient
创建一脚本:    
cat /sbin/wpa_action.sh 
#!/bin/sh
IFNAME=$1
CMD=$2
if [ "$CMD" = "CONNECTED" ]; then
   echo connect $IFNAME, dhclient for it > /dev/console
   dhclient $IFNAME
fi
if [ "$CMD" = "DISCONNECTED" ]; then
   echo disconnect $IFNAME, kill dhclient for it > /dev/console
   killall dhclient
fi


chmod +x /sbin/wpa_action.sh


wpa_cli -a/sbin/wpa_action.sh -B