c

// 发送结束字符buffer[0] =EOT;
if (write(sock, buffer, 1) !=1) {
printf("Failed to send EOT\n");
fclose(file);
close(sock);
return1;
    }
// 等待接收方的ACKif (read(sock, &recv_ack, sizeof(recv_ack)) !=sizeof(recv_ack)) {
printf("Failed to receive ACK\n");
fclose(file);
close(sock);
return1;
    }
if (ntohs(recv_ack) !=ACK0+sequence) {
printf("Failed to receive ACK\n");
fclose(file);
close(sock);
return1;
    }
// 关闭文件和套接字fclose(file);
close(sock);
return0;
}