Re: RFC: configuring net interfaces

From: Francois Romieu (romieu@cogenit.fr)
Date: Tue Apr 03 2001 - 03:27:34 EST

Krzysztof Halasa <khc@intrepid.pm.waw.pl> écrit :
[...]
> > Comments welcome. IMHO domain-specific ioctls are a better direction
> > than the current make-sockios.h-huge-with-new-ioctls approach.
>
> I think we should separate two things there:
> - the place (files) where SIOCxxx values are defined
> - the way we use ioctl call.

(1) and (2) may be related:
no sub-ioctl (2) + scattered files (1) = *ouch*

[...]
> you have to call it with:
> proto = malloc();
> ifreq.name = "qwe0";
> ifreq.data = proto;
> (int*)proto = SIOC_SET_FR_PROTO_PARAMETERS;
> (fr_protocol)(((int*)proto) + 1).fr_protocol.t391 = 20;
> (fr_protocol)(((int*)proto) + 1).fr_protocol.n393 = 5;
> ioctl(s, SIOC_FR_PROTO, &ifreq);

Variant:
        struct sub_req sub;

        sub.fr_protocol.t391 = 20;
        sub.fr_protocol.n293 = 5;
        sub.sub_ioctl = SIOC_SET_FR_PROTO_PARAMETERS;
        ifreq.name = "qwe0";
        ifreq.data = &sub;
        ioctl(s, SIOC_FR_PROTO, &ifreq);

At least it avoids digging at a special position in a structure
to know the expected operation and the underlying structure.

struc sub_req {
        int sub_ioctl;
        union {
                struct fr_protocol fr_prot;
                ...
                struct xx_protocol xx_prot;
        }
}

struct if_req {
        int name;

        struct sub_req sub;
}

It could avoid a flat name-space. Opinion anyone ? 

-- 
Ueimor
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