Re: userspace access to "u8", "u16", etc. types with filter.h

Alexander L. Belikoff (c22b2f405844e04510a79eef20f630a7@interlinx.bc.ca)
Fri, 22 Jan 1999 19:58:40 +0000 ( )

from the quill of Philip Blundell <pb@nexus.co.uk> on scroll
<E103gyu-0006uz-00@fountain.nexus.co.uk>
>
> Including <linux/*> headers from user space is always dubious.

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.

> Either typedef
> those names yourself or duplicate the structure with types that do
> exist.

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?

> AF_PACKET is the new way to do this.

Cool. Will look into this.

Thanks very much for your insight on this matter.

b.

--
Brian J. Murrell                              InterLinx Support Services, Inc.
North Vancouver, B.C.                                             604 983 UNIX
        Platform and Brand Independent UNIX Support - R3.2 - R4 - BSD


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