detecting breakpoint type and number

detecting breakpoint type and number

[Charlls Quarra]

 Hi,

 I have a script that continues on a watchpointed
variable untils its value becomes something expected.
the script looks like this:

define bla
 set $conti=1
 while $conti==1
  set $u=*(int*)$address
  if $u==<expected_value> 
   set $conti=0
   else
   cont
   end
  end
 end

note the cont command in the else subclause; the
problem is that i dont know how to detect if the stop
was due to my watchpointed variable at $address, or
some other breakpoint/watchpoint occuring
simultaneously.

 can i attach procedures to particular
watchpoints/breakpoints that get called when they are
triggered? apparently the only way to figure out what
type of break occurred is to have breaks/watchs to
modify dedicated variables


 cheers

 




	
	
		
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Re: detecting breakpoint type and number

[Daniel Jacobowitz]

On Wed, Jul 14, 2004 at 08:01:07PM -0300, Charlls Quarra wrote:
> 
>  Hi,
> 
>  I have a script that continues on a watchpointed
> variable untils its value becomes something expected.
> the script looks like this:
> 
> define bla
>  set $conti=1
>  while $conti==1
>   set $u=*(int*)$address
>   if $u==<expected_value> 
>    set $conti=0
>    else
>    cont
>    end
>   end
>  end
> 
> note the cont command in the else subclause; the
> problem is that i dont know how to detect if the stop
> was due to my watchpointed variable at $address, or
> some other breakpoint/watchpoint occuring
> simultaneously.
> 
>  can i attach procedures to particular
> watchpoints/breakpoints that get called when they are
> triggered? apparently the only way to figure out what
> type of break occurred is to have breaks/watchs to
> modify dedicated variables

Take a look at the "commands" command.

-- 
Daniel Jacobowitz

Re: detecting breakpoint type and number

[Eli Zaretskii]

> Date: Wed, 14 Jul 2004 20:01:07 -0300 (ART)
> From: =?iso-8859-1?q?Charlls=20Quarra?= <charlls_quarra@yahoo.com.ar>
> 
>  I have a script that continues on a watchpointed
> variable untils its value becomes something expected.
> the script looks like this:
> 
> define bla
>  set $conti=1
>  while $conti==1
>   set $u=*(int*)$address
>   if $u==<expected_value> 
>    set $conti=0
>    else
>    cont
>    end
>   end
>  end

I don't understand why you need this.  You could simply specify the
condition when you set the watchpoint:

  (gdb) watch *(int*)$address if *(int*)$address == <expected_value>

or use the `condition' command (which see) for an already existing
watchpoint.