On Nov 26, 2009, at 1:28 AM, Seshu ....^^k`GaaRa~.... wrote:
> Hello all,
> I am working on building a routing protocol using
> 6lowpan stack.
> In my application, I need to broadcast a msg and it leads to this
> part of code from IPP.nc (around line 640)
> I am using TOSSIM for simulation on micaz platform. When i run my
> simulation, it runs till the dbg statement
> It prints "Copy Header". and prints Segmentation fault.
> I hope this means procedure memcpy is not executed properly, isn't it?
>
> I have no clue of what could be the problem. Has anyone faced
> similar kind of problem, please help.
>
> The Code till where it runs perfectly.
>
> /* copy header */
> if (pkt->header_begin && pkt->header_len) {
> dbg("AM","Copy Header\n");
> memcpy(payload, pkt->header_begin, pkt->header_len);
> }
> payload += pkt->header_len;
>
> Thank you
Run it in gdb. Two obvious possible problems: pkt->header_len is
corrupted and super-long, or payload is not a valid pointer. That's C
for you.
Phil
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