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POcalculate time to receive/send data inorder to calculate bandwidth
 

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    <p>I have a packet sniffer (see below). To measure bandwidth I think I need to start a timer at the beginning of receving data. Record the number of bytes that has been transmitted and then calculate the average bandwidth. To measure time time to receive/send data I did:</p> <pre><code>int main() { //usual packet sniffer staff up untill while loop struct pcap_pkthdr header; const unsigned char *packet; char errbuf[PCAP_ERRBUF_SIZE]; char *device; pcap_t *pcap_handle; int i; device = pcap_lookupdev(errbuf); if (device == NULL) perror("pcap_lookupdev failed"); printf("Sniffing on device %s\n", device); pcap_handle = pcap_open_live(device, 4096, 1, 0, errbuf); if (pcap_handle == NULL) perror("pcap_open_live failed"); while (1) { //starting the timer double diff = 0.0; time_t start; time_t stop; char buff[128]; time(&amp;start); //receiving packet packet = pcap_next(pcap_handle, &amp;header); //stopping the timer time(&amp;stop); //measuring time of receiving data diff = difftime(stop, start); process_packet(packet, header.len, diff); } } </code></pre> <p>diff turns out to always be 0.0000, which is probably wrong. Is my understanding correct, if yes, Is there any problems with code?</p> <p>I also tries using milliseconds:</p> <pre><code>float diff; clock_t start; clock_t stop; char buff[128]; start = clock(); packet = pcap_next(pcap_handle, &amp;header);//just creates a pointer in no time stop = clock(); diff = (((float)stop - (float)start) / 1000000.0F ) * 1000; </code></pre> <p>The same output...</p>
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