astr...@cendio.se wrote on 05/26/2014 03:20:47:
> From: astr...@cendio.se
> To: <john.flor...@dart.biz>
> Cc: <tigervnc-users@lists.sourceforge.net>
> Date: 05/26/2014 03:22
> Subject: Re: [Tigervnc-users] I wish vncviewer could just exit when
> there's a dropped connection
>
>
> On Fri, 23 May 2014, john.flor...@dart.biz wrote:
>
> > We use the vncviewer in a kiosk fashion for remote access to
> industrial controls and monitors. I have developed a
> > service wrapper around it to keep a persistent connection as the
> sole X windows client. This normally all works very
> > good.
> >
> > While most of our deployments are working great, we have one case
> where the VNC server (sadly, not tigervnc) is regularly
> > (a few times per hour) causing vncviewer to pop a GUI message
> indicating "read: Connection reset by peer (104)". I
> > realize the real problem is almost certainly on the server end,
> but I wish to make my kiosk client more robust. My
> > ultimate preference would be for such error messages to be emitted
> to stderr where my service could capture them and
> > relay them to the appropriate system log. Most importantly, I
> don't want vncviewer to "hang" with such a message. I'd
> > much rather it simply exit (with a non-zero status code) so that
> my kiosk service could restart a fresh viewer and work
> > the best in can despite the errors. I really don't mind the GUI
> messages appearing, I just don't want require the user's
> > interaction to dismiss them. The kiosk's don't have mice and I've
> not seen any way to give the error messages focus --
> > that's likely due to fact that I'm not utilizing any window manager.
> >
> > In reviewing the docs, I don't see any options that would let me
> get any closer to my goal. Did I overlook something?
> > For the record, I don't think a cheat sheet explaining to the
> user that they can "1. hit F8, 2. select 'Exit viewer', 3.
> > hit Enter" is a very good solution.
>
> Yes, this is a known problem when controlling vncviewer from another
> application. In ThinLinc, we are using the following patch. Should
perhaps
> be a runtime configuration option instead.
Such an option would be a most welcomed feature. I've created feature
request #68 [
https://sourceforge.net/p/tigervnc/feature-request-tracker/68/] and
included your patch below there as an attachment.
>
> --- vncviewer.cxx (.../vendor/tigervnc/current/vncviewer)
> (revision 29006)
> +++ vncviewer.cxx (.../trunk/ctc/vnc/tigervnc/vncviewer)
> (revision 29006)
> @@ -31,7 +31,13 @@
> #include <locale.h>
> #include <sys/stat.h>
>
> +#include <libgen.h>
> +#include <string>
> #ifdef WIN32
> +#define ECONNRESET WSAECONNRESET
> +#endif
> +
> +#ifdef WIN32
>
> @@ -501,8 +556,15 @@
>
> delete cc;
>
> - if (exitError != NULL)
> - fl_alert("%s", exitError);
> + if (exitError != NULL) {
> + // ECONNRESET is pretty useless error for us, so we avoid
displaying
> + // that error.
> + char errbuf[64];
> + sprintf(errbuf, "(%d)", ECONNRESET);
>
> + if (strstr(exitError, errbuf) == NULL)
> + fl_alert("%s", exitError);
> + }
> +
>
>
> Br,
> ---
> Peter Astrand ThinLinc Chief Developer
> Cendio AB http://cendio.com
> Teknikringen 8 http://twitter.com/ThinLinc
> 583 30 Linkoping http://facebook.com/ThinLinc
> Phone: +46-13-214600 http://google.com/+CendioThinLinc
>
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