[WinPcap-users] pcap_next_ex timeout after WaitForMultipleObjects

[phengmaly peter]

Hello,

I'm new to winpcap, and right now I ran into a problem
concerning capturing
from multiple devices. I tried to solve this without using
multiple threads.
I supposed that when the 'WaitForMultipleObjects' releases
my thread,
at least one packet is ready to be read by 'pcap_next_ex'.
However, my experience
shows, that it works for a while, but after a few dozen
packets 'pcap_next_ex'
returns with timeout (0). Is it a bug, or I may have
misunderstood something ?

Thanks,
Peter

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#define WPCAP
#include <pcap-int.h>

int main()
{ 
    char errbuf[PCAP_ERRBUF_SIZE];

    char *dev = pcap_lookupdev(errbuf);
    if (!dev)
    {
        printf("pcap_lookupdev(): %s\n", errbuf); 
        exit(1);
    } 
        
    bpf_u_int32 net, mask;
    if (pcap_lookupnet(dev, &net, &mask, errbuf) != 0)
    {
        printf("pcap_lookupnet(): %s\n", errbuf); 
        exit(1);
    }
 
    pcap_t* descr = pcap_open_live(dev,65535,1,1000,errbuf);
    if (descr == NULL)
    {
        printf("pcap_open_live(): %s\n", errbuf); 
        exit(1);
    }

    pcap_pkthdr *header;
    const u_char *packetData;
    HANDLE handleArray[ 1 ];
    handleArray[ 0 ] = pcap_getevent( descr );

    do
    {
//        int sysCallRetVal = WaitForMultipleObjects( 1,
handleArray, false, 500 );
        int sysCallRetVal = WaitForSingleObject(
handleArray[ 0 ], 500 );

        if ( sysCallRetVal == WAIT_TIMEOUT )
            printf( "!!!!!! WAIT_TIMEOUT !!!!!!!!\n" );
        else
        if ( sysCallRetVal == WAIT_OBJECT_0 )
        {
            printf( "!!!!!! PACKET !!!!!!!!\n" );

            int res = pcap_next_ex( descr, &header,
&packetData );
            printf("pcap_next_ex %d\n", res );
            if ( res == 0 )
                exit( 1 );
        }
    } while ( 1 );

    return 0;
}






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