[Xastir] Networking issue for Cygwin (and possible solution)

[Jason Godfrey]

Hello.

Could you try doing a memset to 0 of hints in net_init before the hints
fields are set and see if that helps?  In my copy it is line 3457 in
interface.c.

Thanks
- Jason

On Sat, Oct 30, 2021 at 12:27 PM <easternontariotracks at gmail.com> wrote:

> Thank you Tom.  I agree this is not a universal solution, indeed "temporary
> workaround" is a better description.  I will continue studying how it works
> and report back if I figure out why the hints don't work in Cygwin.
>
> I wonder how many people are compiling Xastir on Cygwin anymore...
>
> -----Original Message-----
> From: Xastir <xastir-bounces at lists.xastir.org> On Behalf Of Tom Russo
> Sent: October 30, 2021 1:06 PM
> To: Xastir - APRS client software discussion <xastir at xastir.org>
> Subject: Re: [Xastir] Networking issue for Cygwin (and possible solution)
>
>
> The call to getaddrinfo in forked_getaddrinfo should not be universally
> zeriong
> the hints.  In fact, for most systems the hints are deliberately set in
> interface.c's "net_init" function and passed down into forked_getaddrinfo.
>
> Zeroing them after that is just wrong in all the cases that already work.
>
> There must be something special about Cygwin that makes the specific hints
> chosen not work there:
>
>   hints.ai_family = AF_UNSPEC;
>   hints.ai_socktype = SOCK_STREAM;
>   hints.ai_protocol = 0;
>   hints.ai_flags = AI_NUMERICSERV|AI_ADDRCONFIG;
>
>
> If you can figure out what is wrong with this specific set of hints that
> lets it work everywhere *except* cygwin then perhaps it can be dealt with
> somehow.  But these hints have been working for quite some time with all
> other systems, so it would be wrong simply to zero them unconditionally.
>
> The specific hints added here were done in commit bbab5f92 in 2018 in order
> to add IPv6 support, so that explains why it stopped working on Cygwin
> relatively recently.
>
> Perhaps Jason (who wrote that code) can investigate the right fix.
>
>
>
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