Mbed OS Reference | InternetSocket.h Source File

 
 /** \addtogroup netsocket */
 /** @{*/
 /* Socket
  * Copyright (c) 2015 ARM Limited
  * SPDX-License-Identifier: Apache-2.0
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 
 #ifndef INTERNETSOCKET_H
 #define INTERNETSOCKET_H
 
 #include "netsocket/Socket.h"
 #include "netsocket/NetworkStack.h"
 #include "rtos/Mutex.h"
 #include "rtos/EventFlags.h"
 #include "Callback.h"
 #include "mbed_atomic.h"
 #include "mbed_toolchain.h"
 #include "SocketStats.h"
 
 /** Socket implementation that uses IP network stack.
  * Not to be directly used by applications. Cannot be directly instantiated.
  */
 class InternetSocket : public Socket {
 public:
     /** Destroy the socket.
      *
      *  @note Closes socket if it's still open.
      */
     ~InternetSocket() override;
 
     /** Open a network socket on the network stack of the given
      *  network interface.
      *
      *  @note Not needed if stack is passed to the socket's constructor.
      *
      *  @param stack    Network stack as target for socket.
      *  @retval         NSAPI_ERROR_OK on success.
      *  @retval         NSAPI_ERROR_PARAMETER in case the provided stack was invalid
      *                  or a stack was already created and socket opened successfully.
      *  @retval         int negative error codes for stack-related failures.
      *                  See @ref NetworkStack::socket_open.
      */
     nsapi_error_t open(NetworkStack *stack);
 
 #if !defined(DOXYGEN_ONLY)
     template <typename S>
     nsapi_error_t open(S *stack)
     {
         return open(nsapi_create_stack(stack));
     }
 #endif //!defined(DOXYGEN_ONLY)
 
     /** Close any open connection, and deallocate any memory associated
      *  with the socket. Called from destructor if socket is not closed.
      *
      *  @retval         NSAPI_ERROR_OK on success.
      *  @retval         NSAPI_ERROR_NO_SOCKET if socket is not open.
      *  @retval         int negative error codes for stack-related failures.
      *                  See @ref NetworkStack::socket_close.
      */
     nsapi_error_t close() override;
 
     /** Subscribe to an IP multicast group.
      *
      * @param address   Multicast group IP address.
      *  @return         NSAPI_ERROR_OK on success, negative error code on failure (@see InternetSocket::setsockopt).
      */
     int join_multicast_group(const SocketAddress &address);
 
     /** Leave an IP multicast group.
      *
      * @param address   Multicast group IP address.
      *  @return         NSAPI_ERROR_OK on success, negative error code on failure (@see InternetSocket::setsockopt).
      */
     int leave_multicast_group(const SocketAddress &address);
 
     /** Get estimated round trip time to destination address.
      *
      * Use estimated round trip time to adjust application retry timers to work in networks
      * that have low data rate and high latency.
      *
      * @param address   Destination address to use in rtt estimate.
      * @param rtt_estimate   Returned round trip time value in milliseconds.
      *  @return         NSAPI_ERROR_OK on success.
      *  @return         NSAPI_ERROR_PARAMETER if the provided pointer is invalid.
      *  @return         negative error code on other failures (@see InternetSocket::getsockopt).
      */
     int get_rtt_estimate_to_address(const SocketAddress &address, uint32_t *rtt_estimate);
 
     /** Get estimated stagger value.
      *
      * Stagger value is a time that application should wait before using heavy network operations after connecting to network.
      * Purpose of staggering is to avoid network congestion that may happen in low bandwith networks if multiple
      * applications simultaneously start heavy network usage after joining to the network.
      *
      * @param address       Destination added used to estimate stagger value.
      * @param data_amount   Amount of bytes to transfer in kilobytes.
      * @param stagger_min   Minimum stagger value in seconds.
      * @param stagger_max   Maximum stagger value in seconds.
      * @param stagger_rand  Randomized stagger value between stagger_min and stagger_max in seconds.
      * @return              NSAPI_ERROR_OK on success.
      * @return              negative error code on other failures (@see InternetSocket::getsockopt).
      */
     int get_stagger_estimate_to_address(const SocketAddress &address, uint16_t data_amount, uint16_t *stagger_min, uint16_t *stagger_max, uint16_t *stagger_rand);
 
     /** Bind the socket to a port on which to receive data.
      *
      *  @param port     Local port to bind.
      *  @retval         NSAPI_ERROR_OK on success.
      *  @retval         NSAPI_ERROR_NO_SOCKET if socket is not open.
      *  @retval         int negative error codes for stack-related failures.
      *                  See @ref NetworkStack::socket_bind.
      */
     nsapi_error_t bind(uint16_t port);
 
     /** @copydoc Socket::bind
      */
     nsapi_error_t bind(const SocketAddress &address) override;
 
     /** @copydoc Socket::set_blocking
      */
     void set_blocking(bool blocking) override;
 
     /** @copydoc Socket::set_timeout
      */
     void set_timeout(int timeout) override;
 
     /** @copydoc Socket::setsockopt
      */
     nsapi_error_t setsockopt(int level, int optname, const void *optval, unsigned optlen) override;
 
     /** @copydoc Socket::getsockopt
      */
     nsapi_error_t getsockopt(int level, int optname, void *optval, unsigned *optlen) override;
 
     /** @copydoc Socket::sigio
      */
     void sigio(mbed::Callback<void()> func) override;
 
     /** @copydoc Socket::getpeername
      */
     nsapi_error_t getpeername(SocketAddress *address) override;
 
 
 #if !defined(DOXYGEN_ONLY)
 
 protected:
     InternetSocket();
     virtual nsapi_protocol_t get_proto() = 0;
     void event();
     int modify_multicast_group(const SocketAddress &address, nsapi_socket_option_t socketopt);
     char _interface_name[NSAPI_INTERFACE_NAME_MAX_SIZE];
     NetworkStack *_stack = nullptr;
     nsapi_socket_t _socket = nullptr;
     uint32_t _timeout = osWaitForever;
     mbed::Callback<void()> _event;
     mbed::Callback<void()> _callback;
     rtos::EventFlags _event_flag;
     rtos::Mutex _lock;
     SocketAddress _remote_peer;
     uint8_t _readers = 0;
     uint8_t _writers = 0;
     core_util_atomic_flag _pending = CORE_UTIL_ATOMIC_FLAG_INIT;
     bool _factory_allocated = false;
 
     // Event flags
     static const int READ_FLAG     = 0x1u;
     static const int WRITE_FLAG    = 0x2u;
     static const int FINISHED_FLAG = 0x3u;
 
     friend class DTLSSocket;  // Allow DTLSSocket::connect() to do name resolution on the _stack
     SocketStats _socket_stats;
 
 #endif //!defined(DOXYGEN_ONLY)
 };
 
 #endif // INTERNETSOCKET_H
 
 /** @}*/
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