[vdr] Re: Segmentation Fault with Remote Plugin

[Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de>]

Oliver Endriss wrote:
> 
> Klaus Schmidinger wrote:
> > Oliver Endriss wrote:
> > > Hi,
> > > I wrote a remote control plugin for the NEWSTRUCT+Hauppauge remote
> > > control. If this plugin is loaded and vdr terminates (e.g.
> > > restart), it crashes with a segmentation fault.
> > > ...
> > > It appears that the segfault occurres when the remote control
> > > objects are destroyed by vdr.
> > > The plugin remote class is derived from the cRemote class, but it's
> > > not a vanilla cRemote object.
> > > The cRemotes class manages a list of cRemote objects.
> > > I think that the problem occures because of a type conflict: vdr
> > > tries to destroy an object in the cRemotes list which has a wrong
> > > type. Could a C++ expert comment on this?
> > >
> > > Oliver
> > >
> > > P.S.: After removing the line 'Remotes.Add(this);' in remote.c,
> > > the problem disappeared...
> >
> > Could it be that you delete your cRemote derived object when the
> > program ends? From PLUGINS.html:
> >
> >   Note that the object has to be created on the heap (using new),
> >   and you shall not delete it at any point (it will be deleted
> > automatically ********************************
> >   when the program ends).
> 
> I create the object on the heap and I don't delete it anywhere.
> (I double-checked with your instructions in PLUGINS.html.)
> 
> Meanwhile I did some more tests:
> - I created a dummy plugin which is nothing more than the code copied
> from PLUGINS.html. It is sufficient to create a object of a class which
> is  derived from cRemote. --> same problem.
> - If I create an object of type cRemote, it works!
> - I moved cKbdRemote into a plugin. --> same problem.
> - I linked my plugin with the vdr main program --> problem gone!
> 
> Therefore, the problem must be related to shared object libraries.
> Maybe, some object information is not transported correctly due to
> dynamic linking?

Please send me that dummy plugin you created and I'll give it a try.

Klaus
-- 
_______________________________________________________________

Klaus Schmidinger                       Phone: +49-8635-6989-10
CadSoft Computer GmbH                   Fax:   +49-8635-6989-40
Hofmark 2                               Email:   kls@cadsoft.de
D-84568 Pleiskirchen, Germany           URL:     www.cadsoft.de
_______________________________________________________________


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