Is there a way to measure elapsed time running the program under gdb?
Look to this:
Assume that we are debugging a file and in some random place, we set a breakpoint. Now in gdb we perform something and then we let the program continue the execution by using the gdb command line (run).
My question is here. I want to measure the elapsed time from the bp (breakpoint) until the program either successfully ends or some error occurs.
My suggestion is to use .gdbinit file, and in that file we call some C function to start the timer after run command and at the end of the execution we also call a gettime() C fun.
So, my pseudo code is a bit like this (.gdbinit file):
break *0x8048452 (random place)
//start time
run
//get time
What do you think of this :
.gdbinit
python import time
python start_time = time.time()
cont
python elapsed_time = time.time() - start_time
python print (time.time()-start_time)
end
but your gdb should has python support.
Take a look at this
http://unix.stackexchange.com/questions/312086/elapsed-time-in-gdb/312228?noredirect=1#comment548892_312228
time1 time2
running | |
process | |
o-----------------|bp---------------|------------->
| |
|___EDL______|
"I don't understand clearly, what is his problem" (Lajos)
:) . I'm so sorry if my question vague and unclear. But I don't
want to complicate the question.
Simply, I try to measure EDL (Error Detection Latency).
in (time1) we set a breakpoint in gdb Linux, and at this point
, we did bit-flip on the EIP instructions pointer and then write it back
to the stack, now tell the suspended process to continue its mission.
(By involving CFC control flow checking technique) assume that at (time2)
the error or the CFE control flow error will be detected. Therefore, EDL is error detection latency. I want to measure this period of time.
I have implemented it by using gdb & python library but I some confused
about the value I deduced.
At (time1 -breakpoint place- ) I ran the timer by python and
when the Control flow error is detected, I read the timer value and the readed value
is EDL.
Really, I do not understand what is the relationship between what I hope to do
and the machine clock or clock cycle.
Thank you very much.
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