cbthook failed when i click debugview 4.76 (latest)

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sleepsleep

Joined: 05 Oct 2006
Posts: 13084
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sleepsleep 22 Mar 2009, 06:57

like subject.
i downloaded the latest debugview 4.76
http://technet.microsoft.com/en-us/sysinternals/bb896647.aspx

using the latest fasm 1.67.36
in the latest windows 7 build 7057 (i tried in windows xp sp2 too)

it hangs when i click debug view. weird....

cbthook.asm
myapp.asm

nothing magic here, but why it hangs the debugview is beyond me.

Description:	cbthook.asm	Download
Filename:	cbthook.asm
Filesize:	2.8 KB
Downloaded:	216 Time(s)

Description:	myapp.asm	Download
Filename:	myapp.asm
Filesize:	2.84 KB
Downloaded:	210 Time(s)

Last edited by sleepsleep on 22 Mar 2009, 16:02; edited 1 time in total

22 Mar 2009, 06:57

sleepsleep 22 Mar 2009, 16:00

ok, i found some weird stuff here.
if i disable the below

Code:

        .attach: 
        ; ------ 
       ; invoke  OutputDebugString,d1 
                jmp     .exit 
         
        .detach: 
        ; ------ 
        ;invoke  OutputDebugString,d2

then the application works without hanging the debugview. isn't this weird?

22 Mar 2009, 16:00

comrade

Joined: 16 Jun 2003
Posts: 1150
Location: Russian Federation

comrade 22 Mar 2009, 22:32

OutputDebugString ("the producer") works by synchronizing with "the consumer" (DebugView, any other debugger) as described here:

http://unixwiz.net/techtips/outputdebugstring.html

I've looked over your sources and the only fishy thing you are doing is calling OutputDebugString under the loader lock (because you are in DLL main). That shouldn't be a problem though.

Can you clarify, what exactly hangs? DebugView or your application?

22 Mar 2009, 22:32

sleepsleep 23 Mar 2009, 04:30

hi there comrade,
thanks for the time you took to look at my source.
i think i figure out whats the problem.

it seems that i shouldn't use the debugview on the same machine that i run cbthook.

eg,
after i start debugview,
then i start my cbthook program,
then i activate the debugview window (sort of deadlock i think)
coz, my program will hook on the debugview and i use debugview to ODString... (i guess)

well, after i use a debugview remotely, hanging problem doesn't appear and all attach stuff detach gracefully.

23 Mar 2009, 04:30

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