Re: backward compatibility in pcap_loop(3PCAP)?

[Guy Harris via tcpdump-workers <tcpdump-workers () lists tcpdump org>]

> --- Begin Message ---
>
>
> From: Guy Harris <gharris () sonic net>
>
> Date: Fri, 21 Aug 2020 15:19:25 -0700
>
> On Aug 21, 2020, at 2:48 PM, Denis Ovsienko via tcpdump-workers <tcpdump-workers () lists tcpdump org> wrote:
>
> > The man page says:
> >
> >       (In  older  versions  of libpcap, the behavior when cnt was 0
> >       was undefined; different platforms and devices  behaved
> >       differently,  so  code that  must work with older versions of
> >       libpcap should use -1, not 0, as the value of cnt.)
> >
> > Would it make sense to move this paragraph to a BACKWARD COMPATIBILITY
> > section and to tell which specific version started to recognise 0 as a
> > valid value?
>
> That's where other "some of what this manual page says doesn't apply to older versions of libpcap" items go, so it'd 
> make sense.
>
> The PACKET_COUNT_IS_UNLIMITED(), which is what pcap modules should now be using, was introduced in libpcap 1.5, so the 
> first version where either 0 or -1 should work is 1.5.
>
> --- End Message ---
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