int GetNextPkt(SOCKET UDPSock, struct PACKET *pkt, int WaitSec, int WaitMilSec)

{

struct sockaddr_in from;

int sl = sizeof(from);

fd_set readFd;

timeval SelectTime;

SelectTime.tv_sec = WaitSec;

SelectTime.tv_usec=WaitMilSec;

FD_ZERO(&readFd);

FD_SET(UDPSock,&readFd);

int ret = select(255,&readFd,NULL,NULL,&SelectTime);

if (FD_ISSET(UDPSock, &readFd)==1)

{

ret = recvfrom(UDPSock, (char *)pkt, sizeof(struct PACKET), 0 ,(struct sockaddr *)&from,(socklen_t*)&sl);

if (ret>0)

{

strcpy(pkt->IPsVisited[pkt->NumHops],MYIP);

pkt->PortsVisited[pkt->NumHops]=UDPPort;

(pkt->NumHops)++;

ShowPkt(pkt,&from);

return ret;

}

}

return -1;

}