Re: New APIs to support multiple DLT_'s on an interface

[Guy Harris <gharris () sonic net>]

On Thu, Dec 12, 2002 at 01:04:38AM -0600, David Young wrote:
> For the sake of a consistent interface across platforms, I prefer
> that *every* tcpdump support both -L and -y. On platforms without a
> choice of DLT, however, tcpdump should not require the DLT API from
> libpcap. Instead, it should provide a trivial implementation which lists
> one DLT for -L and which insists that -y provide that DLT, only.
>
> On platforms it is implemented, pcap_list_datalinks should always return
> at least one DLT. Also, pcap_set_datalink should permit you to set at
> least any DLT on the list, but no DLT that is not on the list.

        ...

> pcap_list_datalinks belongs in whichever platform-dependent file
> pcap_set_datalink is in, since it does not make sense to have one without
> the other.

So does that mean you think that "pcap_list_datalinks()" and
"pcap_set_datalink()" should be present only on platforms that support a
choice of DLT (i.e., present only on current CVS versions of NetBSD, for
now), rather than having "pcap_list_datalinks()" return the one and only
DLT and "pcap_set_datalink()" allowing the DLT to be set only to the
value it already has?
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