Re: How to check if pcap_t is really free?

[Nadav Vinik <nadavvin () gmail com>]

On 20 June 2013 20:16, Gert Doering <gert () greenie muc de> wrote:

> Hi,
>
> On Thu, Jun 20, 2013 at 07:44:00PM +0300, Nadav Vinik wrote:
> > After pcap_close handle is not NULL  since the following printf is not
> print
> > thanks
> > Nadav
> >
> > pcap_close(handle);
> >         if(handle == NULL) {
>
> In C, this will never ever change the value of "handle", unless
> pcap_close() is a macro, which it isn't.
>
> This is not pascal, we have no way for a function to modify it's
> arguments silently (you'd need to pass a pointer, &handle, to achiee
> that)

thanks

Hoever if I change to pcap_close(&handle) I get the following error:
$ make
gcc ./a.c -lpcap
./a.c: In function ‘main’:
./a.c:53:3: warning: passing argument 1 of ‘pcap_close’ from incompatible
pointer type [enabled by default]
In file included from /usr/include/pcap.h:45:0,
                 from ./a.c:1:
/usr/include/pcap/pcap.h:350:6: note: expected ‘struct pcap_t *’ but
argument is of type ‘struct pcap_t **’


thanks
Nadav


> gert
>
> --
> USENET is *not* the non-clickable part of WWW!
>                                                            //
> www.muc.de/~gert/
> Gert Doering - Munich, Germany
> gert () greenie muc de
> fax: +49-89-35655025
> gert () net informatik tu-muenchen de



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