TCPSocket.h

00001 
00002 /** \addtogroup netsocket */
00003 /** @{*/
00004 /* TCPSocket
00005  * Copyright (c) 2015 ARM Limited
00006  *
00007  * Licensed under the Apache License, Version 2.0 (the "License");
00008  * you may not use this file except in compliance with the License.
00009  * You may obtain a copy of the License at
00010  *
00011  *     http://www.apache.org/licenses/LICENSE-2.0
00012  *
00013  * Unless required by applicable law or agreed to in writing, software
00014  * distributed under the License is distributed on an "AS IS" BASIS,
00015  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00016  * See the License for the specific language governing permissions and
00017  * limitations under the License.
00018  */
00019 
00020 #ifndef TCPSOCKET_H
00021 #define TCPSOCKET_H
00022 
00023 #include "netsocket/Socket.h"
00024 #include "netsocket/NetworkStack.h"
00025 #include "netsocket/NetworkInterface.h"
00026 #include "rtos/Semaphore.h"
00027 
00028 
00029 /** TCP socket connection
00030  */
00031 class TCPSocket : public Socket {
00032 public:
00033     /** Create an uninitialized socket
00034      *
00035      *  Must call open to initialize the socket on a network stack.
00036      */
00037     TCPSocket();
00038 
00039     /** Create a socket on a network interface
00040      *
00041      *  Creates and opens a socket on the network stack of the given
00042      *  network interface.
00043      *
00044      *  @param stack    Network stack as target for socket
00045      */
00046     template <typename S>
00047     TCPSocket(S *stack)
00048         : _pending(1), _read_sem(0), _write_sem(0),
00049           _read_in_progress(false), _write_in_progress(false)
00050     {
00051         open(stack);
00052     }
00053 
00054     /** Destroy a socket
00055      *
00056      *  Closes socket if the socket is still open
00057      */
00058     virtual ~TCPSocket();
00059 
00060     /** Connects TCP socket to a remote host
00061      *
00062      *  Initiates a connection to a remote server specified by either
00063      *  a domain name or an IP address and a port.
00064      *
00065      *  @param host     Hostname of the remote host
00066      *  @param port     Port of the remote host
00067      *  @return         0 on success, negative error code on failure
00068      */
00069     nsapi_error_t connect(const char *host, uint16_t port);
00070 
00071     /** Connects TCP socket to a remote host
00072      *
00073      *  Initiates a connection to a remote server specified by the
00074      *  indicated address.
00075      *
00076      *  @param address  The SocketAddress of the remote host
00077      *  @return         0 on success, negative error code on failure
00078      */
00079     nsapi_error_t connect(const SocketAddress &address);
00080     
00081     /** Send data over a TCP socket
00082      *
00083      *  The socket must be connected to a remote host. Returns the number of
00084      *  bytes sent from the buffer.
00085      *
00086      *  By default, send blocks until data is sent. If socket is set to
00087      *  non-blocking or times out, NSAPI_ERROR_WOULD_BLOCK is returned
00088      *  immediately.
00089      *
00090      *  @param data     Buffer of data to send to the host
00091      *  @param size     Size of the buffer in bytes
00092      *  @return         Number of sent bytes on success, negative error
00093      *                  code on failure
00094      */
00095     nsapi_size_or_error_t send(const void *data, nsapi_size_t size);
00096     
00097     /** Receive data over a TCP socket
00098      *
00099      *  The socket must be connected to a remote host. Returns the number of
00100      *  bytes received into the buffer.
00101      *
00102      *  By default, recv blocks until data is sent. If socket is set to
00103      *  non-blocking or times out, NSAPI_ERROR_WOULD_BLOCK is returned
00104      *  immediately.
00105      *
00106      *  @param data     Destination buffer for data received from the host
00107      *  @param size     Size of the buffer in bytes
00108      *  @return         Number of received bytes on success, negative error
00109      *                  code on failure
00110      */
00111     nsapi_size_or_error_t recv(void *data, nsapi_size_t size);
00112 
00113 protected:
00114     friend class TCPServer;
00115 
00116     virtual nsapi_protocol_t get_proto();
00117     virtual void event();
00118 
00119     volatile unsigned _pending;
00120     rtos::Semaphore _read_sem;
00121     rtos::Semaphore _write_sem;
00122     bool _read_in_progress;
00123     bool _write_in_progress;
00124 };
00125 
00126 
00127 #endif
00128 
00129 /** @}*/