pcap_snapshot - get the snapshot length
int pcap_snapshot(pcap_t *p);
returns the snapshot length specified when
was called, for a live
capture, or the snapshot length from the capture file, for a ``savefile''.
It must not be called on a pcap descriptor created by pcap_create()
has not yet been activated by pcap_activate()
returns the snapshot length on success and
if called on a capture handle that has been
created but not activated.