how to handle _IO_STAT message?

just as topic
thanks for your help

let explain my purpose, my driver create a device /dev/sample. now i want to use this command( file /dev/null ) to show some messeage.

noc, can you resolve this? or who can do this?

thanks for your help

er, who can tell me dev_t’s member

oh, i forget that dev_t is a data structrue