fd type from number

[Daniel Baluta]

On Tue, Aug 19, 2014 at 6:38 PM, Loris Degioanni <loris at draios.com> 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.
> 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?

https://www.kernel.org/doc/Documentation/filesystems/files.txt

See point 4.

Daniel.