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fd=socket(AF_INET,SOCK_DGRAM,0);
inetaddr=inet_addr(IP);
recv_sockaddr.sin_family=AF_INET; recv_sockaddr.sin_addr.s_addr=inetaddr;
recv_sockaddr.sin_port= htons(port);
recvfrom_socket(recv_sock_fd,sock_buf,sizeof£¨sock_buf£©,(sockaddr_t *)(&recv_sockaddr),&sock_len);
sendto_socket(recv_sock_fd, sock_buf, len, (sockaddr_t *)(&recv_sockaddr),sizeof(sockaddr_t));
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