Re: How to check if pcap_t is really free?

[Guy Harris <guy () alum mit edu>]

On Jun 20, 2013, at 12:36 PM, Nadav Vinik <nadavvin () gmail com> wrote:

> Hoever if I change to pcap_close(&handle) I get the following error:

Because code that passes a pointer to a pointer to a pcap_t, rather than a pointer to a pcap_t, to pcap_close() is 
erroneous code.

You cannot arrange that libpcap somehow make a pcap_t or a pointer to it detectably invalid when you close the handle; 
if you want to know whether a pcap_t has been closed, you will have to make your code explicitly mark it as such.  For 
example, replace all occurrences of

        pcap_close(handle);

in your code with

        pcap_close(handle);
        handle = NULL;
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