share mac parameters in routing protocol segmentationfault(core dumped)

vpchitraa · 04-17-2015, 05:56 PM

Hi

When I try to share mac parameter macSuperframeOrder in routing protocol I got segmentation fault(core dumped)

bed.cc
...
#include "p802_15_4const.h"
#include "p802_15_4mac.h"
#include <cmu-trace.h>
#include <energy-model.h>
MobileNode *nadr[MAXI];
struct MAC_PIB *so;

...

if( df < du ) // if current ED is better than till now
{

if(so->macSuperframeOrder >1)
{
so->macSuperframeOrder -= 1;
}

...

#ifdef DEBUG

...

printf("superframe order = u \n", so->macSuperframeOrder);

#endif

...

I would like to tune the macSuperframeOrder TO IMPEOVE QOS. But when I try access and display the value in new bed routing protocol, it shows segmentaion fault. Kindly tell me how to share and tune mac parameters in routing.

tyrolite · 04-19-2015, 11:16 AM

Build your application with debug symbols and use a debugger... If you didn't use one before, try and IDE with a graphical interface for 'gdb' like Qt Creator or Code::Blocks. After you loaded your project, put a breakpoint in the function that causes the segfault and run the code line-by-line until you get the faulty instruction.

You can use gdb from command line like this:

Code:

gdb <your-exe>
type 'continue' to skip the first breakpoint
do something that triggers the segmentation fault
type 'backtrace' to see the callstack

Also, your printf line is missing a '%' for the format specifier.