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Re: Mixing X and GNUstep


From: Raffael Herzog
Subject: Re: Mixing X and GNUstep
Date: Sat, 12 Jul 2003 13:25:50 +0200

On 2003-07-11 19:43:11 +0200 Adam Fedor <address@hidden> wrote:

Well, the last log message shows that the backend is getting an event that we don't handle. Perhaps you could debug it and find out which event it is (or make the log statement more informative ---see back/Source/x11/XGServerEvent.m: 1269)

New message:

2003-07-12 11:34:11.453 GSXine[11991] Received an untrapped event 94

Looks like event 30 (SelectionRequest) with some bit 6 masked in... I get it each time, the window arrangement changes. It doesn't seem like this really has something to do with the segfault, for now, I think I can savely ignore this message.


Then continue debugging and get a backtrace after the segfault...

There seems to be a bug in gdb (or whatever): The post mortem backtrace is obviously wrong. I'm now trying to get a correct backtrace by running it from within gdb. Dooh, this takes *ages*... Because it took so long, the application wasn't active any more when I got there - and see, no crash until I activated it. This time, the backtrace looks realistic (reproduced twice):

#0  0x405ed799 in objc_msg_lookup ()
  from /usr/GNUstep/System/Library/Libraries/ix86/linux-gnu/libobjc.so.1
#1  0x402109d2 in _c_NSDocumentController__isDocumentBasedApplication ()
from /usr/GNUstep/System/Library/Libraries/ix86/linux-gnu/gnu-gnu-gnu/libgnustep-gui.so.0
#2  0x401cac7f in _i_NSApplication__targetForAction_ ()
from /usr/GNUstep/System/Library/Libraries/ix86/linux-gnu/gnu-gnu-gnu/libgnustep-gui.so.0
#3  0x402421a3 in _i_NSMenu__update ()
from /usr/GNUstep/System/Library/Libraries/ix86/linux-gnu/gnu-gnu-gnu/libgnustep-gui.so.0
#4  0x4024226b in _i_NSMenu__update ()
from /usr/GNUstep/System/Library/Libraries/ix86/linux-gnu/gnu-gnu-gnu/libgnustep-gui.so.0
#5  0x401c9371 in _i_NSApplication__run ()
from /usr/GNUstep/System/Library/Libraries/ix86/linux-gnu/gnu-gnu-gnu/libgnustep-gui.so.0
#6  0x401c1617 in NSApplicationMain ()
from /usr/GNUstep/System/Library/Libraries/ix86/linux-gnu/gnu-gnu-gnu/libgnustep-gui.so.0
#7  0x08049468 in main (argc=1, argv=0xbffff184) at main.m:111

Then I tried to reproduce it to see whether the backtrace is two times the same. However, I couldn't, because this time, there was an exception before the segfault:

/home/rherzog/projects/GNUstep/GSXine/GSXine.debug/ix86/linux-gnu/gnu-gnu-gnu/GSXine: Uncaught exception NSInvalidArgumentException, reason: GSCString(instance) does not recognize pathForResource:ofType:

(Would be nice, if exceptions could provide a Java-like backtrace)


Well, I'll now first clean up the code a bit... (branched off from a tutorial)


Thanks,
  Raffi

--
 The difference between theory and practice is that in theory, there is
                no difference, but in practice, there is.

Raffael Herzog - address@hidden - http://www.raffael.ch - ICQ #67961355





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