Timer

Marc Brünink marc@nus.edu.sg
Tue May 7 06:42:00 GMT 2013


On May 7, 2013, at 12:43 PM, Doug Evans wrote:

> On Mon, May 6, 2013 at 2:52 AM, Marc Brünink <marc@nus.edu.sg> wrote:
>> I want to execute a piece of code at regular intervals. Actually I'm sampling $pc.
>> (let's not go into detail why I use gdb)
>> 
>> My current solution just starts another process that sends a SIGTRAP to the debugged application. Using a simple script I can print the $pc.
>> 
>> However, I just realised that this approach does not work too well. If gdb is stopped due to a breakpoint it will interpret the received SIGTRAP as another hit of the very same breakpoint.
>> 
>> Reproduce:
>> 1. Attach to any program
>> 2. Create any breakpoint
>> 3. Wait until breakpoint is hit
>> 4. Send SIGTRAP to debugged application
>> 5. continue
>> 
>> Actually, now that I think about it, I should have anticipated this behaviour.
>> Is there a better way to execute a piece of code at regular intervals?
> 
> bash$ man setitimer

I suppose you are suggesting to modify either GDB or the application. This is exactly what I don't want. Any other way to accomplish this (using gdb)?

Marc


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