Date: Mon, 13 Aug 2001 16:11:45 +0800 From: "Wing Tim" <twchim1@hotmail.com> To: freebsd-questions@FreeBSD.ORG Subject: Programming on Berkeley Packet Filter (bpf) Message-ID: <F148LiC1h1jYhAOylhg000080d8@hotmail.com>
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Hi all,
From the man page of BPF(4), I found there're lots of useful functions
such as BIOCGBLEN, BIOCSBLEN, BIOCGDLT, ... , BIOCGSTATS. I tried to write a
should program to use these functions as follows:
# include <sys/types.h>
# include <sys/time.h>
# include <sys/ioctl.h>
# include <net/bpf.h>
main ()
{
printf(BIOCGBLEN);
...
}
Then I met the error "Segmentation fault (core dumped)", I guess it is
because I haven't specified any interface. Is it right?
By the way, how can I specify which interface I want to snoop data on?
Could anyone kindly give me a help? Thanks!
Regards,
Wing
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