本文详细分析了在使用SUSE 13.26笔记本时，无线网络由NetworkManager管理，却遇到wpa_supplicant后端引擎运行时无法创建runtime socket文件的问题。通过查阅man页面，发现-wu参数代表使用DBus控制接口，这导致忽略了创建/var/run/wpa_supplicant.socket文件，从而揭示了问题所在。
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.
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