fd type from number
Greg KH
greg at kroah.com
Tue Aug 19 12:10:51 EDT 2014
On Tue, Aug 19, 2014 at 08:38:24AM -0700, Loris Degioanni wrote:
> (resending making sure this is not part of another thread)
>
> I'm looking for an efficient way to determine the type of an fd (file,
> socket...) given its number, from a kernel module.
You don't have a "number" from within the kernel, you have a pointer to
the full file descriptor structure, right? If so, what is missing from
that structure that you can not find?
> The closest thing I found by looking at the kernel sources is
> sockfd_lookup(), which works but is limited to telling me if the fd is a
> socket or not.
>
> Is there something else I can look at?
What exactly are you trying to do with this? And what does it matter
what "type" of thing a file descriptor is? What can you do with that
information?
thanks,
greg k-h
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