Bit of an update to my problem-- the computer was going to Sleep (Windows Sleep mode).
Question for the group though-- it appears I can't just use my existing connection to the NIC once WIndows has slept/woken up. Do I need to close the connection and re-open completely? --> C On Sun, Jan 23, 2011 at 11:43 AM, Charlie Heitzig <[email protected]>wrote: > Looking for some thoughts on trouble-shooting a problem. First though, I'm > a bit of a newbie to Winpcap. > > For background, I have a C program that is failing with a > PacketReceivePacket error under Cygwin on Windows 7 x64. To better > illustrate the problem, I built a debug / test harness around one of the > Winpcap code samples-- basic_dump_ex.c (full modified version attached). > > I modified the last bit of code to loop and re-run pcap_next_ex() after an > error: > >> while((res = pcap_next_ex( adhandle, &header, &pkt_data)) >= 0){ >> >> if(res == 0) >> /* Timeout elapsed */ >> continue; >> >> /* convert the timestamp to readable format */ >> local_tv_sec = header->ts.tv_sec; >> ltime=localtime(&local_tv_sec); >> strftime( timestr, sizeof timestr, "%H:%M:%S", ltime); >> >> printf("%s,%.6d len:%d\n", timestr, header->ts.tv_usec, header->len); >> } >> >> if(res == -1){ >> printf("Error reading the packets: %s\n", pcap_geterr(adhandle)); >> /* Try the next packet one more time */ >> if((res = pcap_next_ex( adhandle, &header, &pkt_data)) == -1) >> printf("Second error reading the packets: %s\n", pcap_geterr(adhandle)); >> return -1; >> } > > > But res never again returns a non-negative number as far as I can tell > (even if I loop endlessly, continuously trying to get another packet. > > So that's my question, I guess-- is any error recovery possible after > receiving a PacketReceivePacket error? Any advice on what > a PacketReceivePacket error means-- bad NIC, bad router, cosmic rays? If I > kill the program and re-start immediately, everything runs again for > somewhere between 2 and 36 hours or so. > > Any thoughts would be appreciated! > > Best, > > --> C >
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