text: /*************************************************************************/
  /*  net_socket_posix.h                                                   */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                      https://godotengine.org                          */
  /*************************************************************************/
  /* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
  /* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md).   */
  /*                                                                       */
  /* Permission is hereby granted, free of charge, to any person obtaining */
  /* a copy of this software and associated documentation files (the       */
  /* "Software"), to deal in the Software without restriction, including   */
  /* without limitation the rights to use, copy, modify, merge, publish,   */
  /* distribute, sublicense, and/or sell copies of the Software, and to    */
  /* permit persons to whom the Software is furnished to do so, subject to */
  /* the following conditions:                                             */
  /*                                                                       */
  /* The above copyright notice and this permission notice shall be        */
  /* included in all copies or substantial portions of the Software.       */
  /*                                                                       */
  /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
  /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
  /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
  /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
  /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
  /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
  /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
  /*************************************************************************/
  
  #pragma once
  
  #include "core/io/net_socket.h"
  
  
  struct SOCKET_HOLDER;
  class NetSocketPosix : public NetSocket {
  
  private:
      SOCKET_HOLDER *_sock;
      IP::Type _ip_type;
      bool _is_stream;
  
      enum NetError {
          ERR_NET_WOULD_BLOCK,
          ERR_NET_IS_CONNECTED,
          ERR_NET_IN_PROGRESS,
          ERR_NET_OTHER
      };
  
      NetError _get_socket_error() const;
      void _set_socket(SOCKET_HOLDER *p_sock, IP::Type p_ip_type, bool p_is_stream);
      _FORCE_INLINE_ Error _change_multicast_group(IP_Address p_ip, StringView p_if_name, bool p_add);
      _FORCE_INLINE_ void _set_close_exec_enabled(bool p_enabled);
  protected:
      static NetSocket *_create_func();
  
      bool _can_use_ip(const IP_Address &p_ip, const bool p_for_bind) const;
  
  public:
      static GODOT_EXPORT void make_default();
      static GODOT_EXPORT void cleanup();
      static void _set_ip_port(struct sockaddr_storage *p_addr, IP_Address &r_ip, uint16_t &r_port);
      static size_t _set_addr_storage(struct sockaddr_storage *p_addr, const IP_Address &p_ip, uint16_t p_port, IP::Type p_ip_type);
  
      Error open(Type p_sock_type, IP::Type &ip_type) override;
      void close() override;
      Error bind(IP_Address p_addr, uint16_t p_port) override;
      Error listen(int p_max_pending) override;
      Error connect_to_host(IP_Address p_host, uint16_t p_port) override;
      Error poll(PollType p_type, int timeout) const override;
      Error recv(uint8_t *p_buffer, int p_len, int &r_read) override;
      Error recvfrom(uint8_t *p_buffer, int p_len, int &r_read, IP_Address &r_ip, uint16_t &r_port, bool p_peek = false) override;
      Error send(const uint8_t *p_buffer, int p_len, int &r_sent) override;
      Error sendto(const uint8_t *p_buffer, int p_len, int &r_sent, IP_Address p_ip, uint16_t p_port) override;
      Ref<NetSocket> accept(IP_Address &r_ip, uint16_t &r_port) override;
  
      bool is_open() const override;
      int get_available_bytes() const override;
  
      Error set_broadcasting_enabled(bool p_enabled) override;
      void set_blocking_enabled(bool p_enabled) override;
      void set_ipv6_only_enabled(bool p_enabled) override;
      void set_tcp_no_delay_enabled(bool p_enabled) override;
      void set_reuse_address_enabled(bool p_enabled) override;
      virtual void set_reuse_port_enabled(bool p_enabled);
      Error join_multicast_group(const IP_Address &p_multi_address, StringView p_if_name) override;
      Error leave_multicast_group(const IP_Address &p_multi_address, StringView p_if_name) override;
  
      GODOT_EXPORT NetSocketPosix();
      GODOT_EXPORT ~NetSocketPosix() override;
  };
  