The three data structures defined in the
/usr/include/pcap.h file for use with the
libpcap.a subroutines are as follows:
| struct pcap_file_header | This structure defines the first record in the savefile that contains the saved packet capture data. |
| struct pcap_pkthdr | This is the structure that defines the packet header that is added to the front of each packet that is written to the savefile. |
| struct pcap_stat | This structure is returned by the pcap_stats subroutine, and contains information related to the packet statistics from the start of the packet capture session to the time of the call to the pcap_stats subroutine. |