trafficserver and raw disk access in FreeBSD

[ming.zym at gmail.com]

Apache Traffic Server may use raw disk for caching, and for privilege
elevation, the worker process(traffic_server) will setuid to nobody, my
question is, how to make traffic_server access the /dev/ada*?

in linux, disk permitting is root:disk 0660, we can go with:
1, setup a new user 'ats', and put it into 'disk' group
2, after setuid, run initgroups() to complete the groups evn.


we need a safe and easy to implement way for raw disk access in
FreeBSD. 

thanks for you help

-- 
zym, Zhao Yongming.
aka: yonghao @ taobao.com
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