Mail Archives: cygwin/2007/10/13/20:01:08
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Christopher Faylor escreveu:
> On Mon, Oct 08, 2007 at 02:43:31PM +0200, Corinna Vinschen wrote:
>> On Oct 3 01:47, Pedro Alves wrote:
>>> By a long shot, Cygwin doesn't do anything funny like hooking
>>> GetThreadContext, does it?
>> cgf might be better suited to answer this, but AFAICS, Cygwin
>> doesn't hook any system function. It just uses them.
>
> Cygwin doesn't hook GetThreadContext or any other system call. It does play
> with the threads stack frame when the thread is first created however.
>
>> OTOH, there are two calls to SetThreadContext in Cygwin, both of them
>> changing Eip. Could that be a problem?
>
> Those should only be triggered in circumstances where a cygwin program
> is interrupted outside of the cygwin dll itself.
>
Thanks guys. I would imagine that to make a difference the
GetThreadContext in the context of gdb itself would have to be hooked.
Any change someone does the little testing to make sure I'm not
having a local problem here?
as easy as:
gcc main.c -o main.exe -g3 -O0
gdb main.exe
start
watch count
'continue' several times, and send me or post here the results.
A log with the these on would be nice, but not essencial:
set debug infrun 1
set debugevents 1
set debugexceptions 1
maint show-debug-regs 1
Cheers,
Pedro Alves
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name="main.c"
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filename="main.c"
#include <stdio.h>
#include <windows.h>
volatile int count = 0;
int
main ()
{
printf ("count %d\n", count);
count = 999;
printf ("count %d\n", count);
count++;
while (1)
{
printf ("count %d\n", count);
count++;
Sleep (1000);
}
return 0;
}
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