Thanks a lot for your help,
The getsockname and so on all worked on each of the platforms I'm using, but
we solved it differently. I agree we should store this info together with
the socket, or not at all use a two socket model.
- Wilbert
----- Original Message -----
From: "Brian Zill" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Friday, September 08, 2000 2:44 PM
Subject: RE: how to get out the PF_xxx of a socket
> Hi Wilbert,
>
> Generally, I think if you're creating the socket, the best thing to do is
to
> keep track of which type you created in some associated variable. Your
code
> sample below, for example, appears to keep this information in the "do6"
> variable, so you don't need to query the socket for it.
>
> On the other hand, if you get a socket of unknown type from somewhere, one
> option is to do a getsockname call on it and check the sa_family field in
> the returned address. This should always work when the socket is already
> bound to an address. However, when this subject came up recently on the
> implementor's mailing list, it was noted that this solution may not work
on
> some implementations in the case where the socket isn't bound to anything.
>
> --Brian
>
> > -----Original Message-----
> > From: Wilbert de Graaf [mailto:[EMAIL PROTECTED]]
> > Sent: Friday, 08 September, 2000 10:21
> > To: [EMAIL PROTECTED]
> > Subject: Q: how to get out the PF_xxx of a socket
> >
> >
> >
> > Hi,
> >
> > I am looking for a way to make code between ipv4 and ipv6 having less
> > ifdef's. What I (think I) need is a way to find out the PF_xxx of a
> > socket socket. Much like:
> >
> >
> > if (do6)
> > s = socket(PF_INET6, ...);
> > else
> > s = socket(PF_INET, ...);
> >
> > setsockopt(s, IPPROTO_IPvX(s), ...);
> >
> >
> > I want to write the macro IPPROTO_IPvX(s), returning IPPROTO_IP if the
> > socket's domain is PF_INET and IPPROTO_IPV6 if it's PF_INET6.
> >
> > I have been going trhough rfc2553 but couldn't find it. Does anybody
> > have a clue ?
> >
> > - Wilbert
> >
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