1 void sock_Close(NLsocket socket)  2 {
    3 nl_socket_t *sock = nlSockets[socket];  4 struct ip_mreq mreq;  5  6 if(sock->type == NL_UDP_MULTICAST)  7 {
    8 /* leave the multicast group */  9 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)&sock->addressout)->sin_addr.s_addr; 10 mreq.imr_interface.s_addr = bindaddress; 11 12 (void)setsockopt((SOCKET)sock->realsocket, IPPROTO_IP, IP_DROP_MEMBERSHIP, 13 (char *)&mreq, (int)sizeof(mreq)); 14 } 15 if(sock->type == NL_RELIABLE_PACKETS) 16 {
   17 /* check for unsent data */ 18 if(sock->sendlen > 0) 19 {
   20 int tries = 200; 21 22 /* 200 * 50 ms = up to a 10 second delay to allow data to be sent */ 23 while(tries-- > 0 && sock->sendlen > 0) 24 {
   25 htThreadSleep(50); 26 } 27 } 28 sock_DeleteSocket(socket); 29 } 30 if((sock->type == NL_RELIABLE_PACKETS || sock->type == NL_RELIABLE) && sock->listen == NL_FALSE) 31 {
   32 struct linger l = {
   1, 10};//延迟10s 33 34 (void)setsockopt((SOCKET)sock->realsocket, SOL_SOCKET, SO_LINGER, (const char *)&l, (int)sizeof(l)); 35 (void)shutdown((SOCKET)sock->realsocket, SD_RECEIVE); 36 } 37 else 38 {
   39 (void)shutdown((SOCKET)sock->realsocket, SD_BOTH); 40 } 41 (void)closesocket((SOCKET)sock->realsocket); 42 }