text: #pragma once
  
  #ifdef WIN32
  #include <WinSock2.h>
  typedef int socklen_t;
  #else
  #include <unistd.h>
  #include <fcntl.h>
  #include <sys/socket.h>
  #include <arpa/inet.h>
  #include <netinet/in.h>
  typedef int SOCKET;
  #define closesocket close
  #endif
  