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From: wen lui <esolvepolito () gmail com>
Date: Thu, 18 Apr 2013 03:56:46 +0200

        handle = pcap_open_live(dev, BUFSIZ, 0, 0, errbuf);
        pcap_compile(handle, &fp, filter_exp, 0, mask) == -1
        pcap_setfilter(handle, &fp);
        struct pcap_pkthdr pcap_header;      // The header that pcap gives
us
        const u_char *pcap_packet;           // The actual packet

        while(1){

          n=fork();
          if(n==0) { // child process
                fd_set rdfds;
                int pcap_fd = pcap_get_selectable_fd(pcap_handler);
                for(;;){
                        FD_ZERO(&rdfds);
                        FD_SET(pcap_fd, &rdfds);
                        FD_SET(sd_proxy, &rdfds);   // here is another fd

                        select(pcap_fd>sd_proxy?pcap_fd+1:sd_proxy+1,
&rdfds, NULL, NULL, NULL)
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