nanogui: Thread: Debug microwindow: nxclient:Corrupted packet

Dear all,

I have met a problem when running mircrowindow, how can I debug it?
:nxclient: Corrupted packet
:nxclient bad readblock -1
:242 Segmentation fault ./nano-X

I know the the error is printed from nanox/client.c in the function 
GrReadBlock() and GrCheckBlockType(), and I would like to know which call 
those function that caused the segmentation fauld?

I have use the multibyte patch for displaying chinese TTF, when I run the 
demo, the error message printed out. Please Help.


Thank a lot,
Gary

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ShingYuen Wong wrote:
> I have met a problem when running mircrowindow, how can I debug it?
> :nxclient: Corrupted packet
> :nxclient bad readblock -1
> :242 Segmentation fault ./nano-X
> I know the the error is printed from nanox/client.c in the function 
> GrReadBlock() and GrCheckBlockType(), and I would like to know which 
> call those function that caused the segmentation fauld?

The nxclient message means that the client library got confused when the 
server suddenly closed the connection. The "Segmentation fault ./nano-X" 
error means that that nano-X crashed with a segmentation fault, which 
explains why it suddenly closed the connection. You need to build 
Microwindows with DEBUG=Y, possibly increase ulimit -c, and try to get 
it to do it again and dump core when it does so. When you have a core 
file, run gdb -c core ./nano-X then try to figure out why it crashed 
("bt" is useful, and if it died in a library function you can use "up" 
to go up until you find the function that called it). Also, running with 
LD_PRELOAD=libefence.so.0.0 can be very helpful.

-- 
------------ Alex Holden - http://www.linuxhacker.org ------------
If it doesn't work, you're not hitting it with a big enough hammer

Hi,

What format are you using in your calls to GrText and GrGetGCTextSize?  UTF8 or UCS16?

Regards,

Jon Foster

Corrupted packets are almost always the result of having a different
versions of the client library and the server.  Rebuild everything to
the same versions, and you should be fine.

Happy hacking!

Jordan

On Wed, 2002-03-20 at 21:41, ShingYuen Wong wrote:
> Dear all,
> 
> I have met a problem when running mircrowindow, how can I debug it?
> :nxclient: Corrupted packet
> :nxclient bad readblock -1
> :242 Segmentation fault ./nano-X
> 
> I know the the error is printed from nanox/client.c in the function 
> GrReadBlock() and GrCheckBlockType(), and I would like to know which call 
> those function that caused the segmentation fauld?
> 
> I have use the multibyte patch for displaying chinese TTF, when I run the 
> demo, the error message printed out. Please Help.
> 
> 
> Thank a lot,
> Gary
> 
> _________________________________________________________________
> Chat with friends online, try MSN Messenger: http://messenger.msn.com
> 
> 
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Here is the applictaion , and I am using the multibyte patch in CVS


GR_Font_ID font_a;
...
int main(void)
{
font_a = GrCCreateFont ("bkai00mp", 20, NULL);
...
...

GrMainLoop(event_handler);
return 0;
}

void event_handler (GR_EVENT *event)
{
  switch (event->type)
  {
    case GR_EVENT_TYPE_EXPOSURE:
      GrSetGCFont(gc, font_a);
      GrText(wid, gc, 20, 20, "XXXX", -1, GR_TFASCII | MWTF_BIG5);
       break;
    case GR_EVENT_TYPE-CLOSE-REQ:
      GrClose();
      eixt(0);
   }
}

I find that in the GrMainLoop(), there is a GrServiceSelect() calling 
GrTypeedReadBlock, which have called GrCheckBlockType, and in 
GrCheckBlockType, it has a statement:
while (GrReadBlock(&b, sizeof(b)) != -1) { ... ...  ...
The GrReadBlock cannot return TRUE, and it seems it cannot read some data 
from the server can cause the segmentation falut.

I want to find why this happened. Please help.

Thank you for helping


Cheer,
Gary

>From: ####@####.#### To: ShingYuen Wong 
####@####.####
>CC: ####@####.####
>Subject: Re: [nanogui] Debug microwindow: nxclient:Corrupted packet
>Date: Thu, 21 Mar 2002 10:40:34 +0000
>
>Hi,
>
>What format are you using in your calls to GrText and GrGetGCTextSize?  
>UTF8 or UCS16?
>
>Regards,
>
>Jon Foster
>
>
>
>
>---------------------------------------------------------------------
>To unsubscribe, e-mail: ####@####.####
>For additional commands, e-mail: ####@####.####
>




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