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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