[Winpcap-users] How to tell if memory is being freed properly?

Angelina Viola angelina.viola at gmail.com
Fri Jan 8 09:40:34 PST 2010

I did more experimentation and this is a false alarm.


Angie V.

On Wed, Jan 6, 2010 at 8:09 PM, Guy Harris <guy at alum.mit.edu> wrote:

> On Jan 6, 2010, at 4:50 PM, Angelina Viola wrote:
> > Hello all, I am using WinPcap to test out some raw packet injection for a
> project that uses a custom protocol. I started from the code here:
> > http://www.codeproject.com/KB/IP/UDPandWPCAP.aspx
> >
> > However, I am currently searching for memory leaks
> Unless the code in that project calls pcap_freealldevs() on the list it
> gets back from pcap_findalldevs_ex(), that's a leak.  Presumably, if you're
> using that code, it's only calling pcap_findalldevs_ex() once, so it's not a
> *continuing* leak, however.
> > and I noticed that when I looked at my app in task manager it was
> increasing its memory usage like crazy. I wanted to see what was causing the
> memory usage, and my first notion was that packets weren't getting freed
> somewhere. So I swapped out my packet_handler() function for the example one
> which comes in basic_dump.c, and switched my libraries to 4.1.1.
> >
> > It still seems that memory just keeps going up and up. I know that I'm
> not supposed to free the pkt_data pointer myself, so is there some config I
> should know about or something so that WinPcap doesn't just keep increasing
> in size?
> How do you know that it's WinPcap, not your application?  WinPcap isn't
> supposed to keep allocating memory while you're capturing traffic, no matter
> *how* it's configured.
> Could you send us your code, so we can see whether there's a leak in it?
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