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SubjectRe: userspace access to "u8", "u16", etc. types with filter.h
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>Indeed.  But this brings us to an intersting dilemma.  What is a
>userspace program to do when it wants to build an LPF and attach it to a
>socket? It needs the definitions in <linux/filter.h> to build the
>filter.

There are three options:

- clean up the kernel header so it works from user space
- get the appropriate definitions included in the libc
- include the definitions somewhere else, either in your application or in
some new library invented for the purpose.

In most cases the latter is probably best.

>Uggh! Does this not sound like a deficiency in the kernel interface to
>you? I really shouldn't have to do either of these. There should be a
>"userspace" version of the required data structures shouldn't there?

It's not really the kernel's job to provide the user space API.

p.



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