How to figure out the file descriptor inside a driver?

[Joel Sherrill]

Carl-Johan Hansson wrote:

> I'm writing a couple of new drivers and in one of them I want to map the 
> file descriptor that I receive when I open the driver with another 
> parameter when I call ioctl(). Is there some way to figure out the file 
> descriptor when I'm inside the driver routine?
> 
> Hope you understand the question!

Do you mean file description in the integer sense (e.g. read()) or
in the FILE * sense (e.g. fread())?
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