The reason of /var/run/wpa_supplican directory does not exist

In my laptop openSuse13.2 64bit,wireless network is managed by NetworkManager.

I find that the NetworkManager use wpa_supplicant as the backend engine,but the runtime socket file is not exist,

it's so strange,so , I test the following and find out the reason.

The key is the -u parameter when start wpa_supplicant daemon server,

I find its meaning from the man page, -u represents for using DBus control interface,this will ignore to create the /var/run/wpa_supplicant socket file.

So,the directory is not exist.

by zhangshaoyan at May 21,2015.