[LIP] Finding what are the process have opened the files.

Hi,

I would like to know what are the process (PIDs) have opened a particular 
file. Is there a tool that exists to find it out.
I dont just want to find which are the process have opened the file 
currently, which I think can be found using lsof.

Can writing an interposer like 
http://www.itworld.com/downloads/UIR000929interposers1.txt be used with 
system call open() to find this?

Thanks
-logu 



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