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[vdr] Re: Segmentation Fault with Remote Plugin
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.
>
> gdb:
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 1024 (LWP 8934)]
> 0x0808c831 in Clear__9cListBase (this=0x80c9bec) at tools.c:874
> 874 delete objects;
> (gdb) list
> 869
> 870 void cListBase::Clear(void)
> 871 {
> 872 while (objects) {
> 873 cListObject *object = objects->Next();
> 874 delete objects;
> 875 objects = object;
> 876 }
> 877 objects = lastObject = NULL;
> 878 }
>
> (gdb) backtrace
> #0 0x0808c831 in Clear__9cListBase (this=0x80c9bec) at tools.c:874
> #1 0x0808c5e7 in _._9cListBase (this=0x80c9bec, __in_chrg=0) at
> tools.c:797
> #2 0x08084ef3 in __static_initialization_and_destruction_0
> (__initialize_p=0,
> __priority=65535) at remote.c:135
> #3 0x08084f46 in _GLOBAL_.D._7cRemote.in () at remote.c:135
> #4 0x0805ee8a in __do_global_dtors_aux ()
> #5 0x08092439 in _fini ()
> #6 0x400f1456 in exit () from /lib/libc.so.6
> #7 0x400de0cd in __libc_start_main () from /lib/libc.so.6
>
> 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).
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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