CAN for critical embedded automotive networks by Fredriksson L.

By Fredriksson L.

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A pointer to the pcap_pkthdr structure. This structure contains useful statistical information about the captured packet, including a microsecond granularity timestamp and packet capture length. 3. A u_char pointer to the start of the actual packet. This pointer refers to the actual packet. The final argument to pcap_dispatch(), user, is the aforementioned user data. Upon success, the function returns the number of packets read; upon failure, the function returns -1 and you can use one of the pcap_*err() functions to find the reason.

Initialize the network interface—The application programmer had to open the network interface by using the correct primitives for the injection layer (link-layer or raw socket layer) desired. Additionally, if the link-layer interface was employed, he or she had to specify a device. 3. Build the packet—The application programmer had to take specific care of memory offsets when calling the building functions. Because memory was allocated as one contiguous chunk, the programmer had to know where each packet header was in memory, which required an intimate knowledge of header byte counts.

No packets were read because the read timeout expired before any packets arrived on the interface. No packets were read because the file descriptor for the capture device was in non-blocking mode, and no packets were available to be read at that time. No packets were read because the savefile is out of packets. int pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user); pcap_loop() has the same functionality as pcap_dispatch() except that it keeps reading packets from p until callback receives and processes cnt packets or until an error occurs.

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