UDPSocket.h

00001 
00002 /** \addtogroup netsocket */
00003 /** @{*/
00004 /* UDPSocket
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 UDPSOCKET_H
00021 #define UDPSOCKET_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 /** UDP socket
00030  */
00031 class UDPSocket : public Socket {
00032 public:
00033     /** Create an uninitialized socket
00034      *
00035      *  Must call open to initialize the socket on a network stack.
00036      */
00037     UDPSocket();
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     UDPSocket(S *stack)
00048         : _pending(0), _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 ~UDPSocket();
00059 
00060     /** Send a packet over a UDP socket
00061      *
00062      *  Sends data to the specified address specified by either a domain name
00063      *  or an IP address and port. Returns the number of bytes sent from the
00064      *  buffer.
00065      *
00066      *  By default, sendto blocks until data is sent. If socket is set to
00067      *  non-blocking or times out, NSAPI_ERROR_WOULD_BLOCK is returned
00068      *  immediately.
00069      *
00070      *  @param host     Hostname of the remote host
00071      *  @param port     Port of the remote host
00072      *  @param data     Buffer of data to send to the host
00073      *  @param size     Size of the buffer in bytes
00074      *  @return         Number of sent bytes on success, negative error
00075      *                  code on failure
00076      */
00077     int sendto(const char *host, uint16_t port, const void *data, unsigned size);
00078 
00079     /** Send a packet over a UDP socket
00080      *
00081      *  Sends data to the specified address. Returns the number of bytes
00082      *  sent from the buffer.
00083      *
00084      *  By default, sendto blocks until data is sent. If socket is set to
00085      *  non-blocking or times out, NSAPI_ERROR_WOULD_BLOCK is returned
00086      *  immediately.
00087      *
00088      *  @param address  The SocketAddress of the remote host
00089      *  @param data     Buffer of data to send to the host
00090      *  @param size     Size of the buffer in bytes
00091      *  @return         Number of sent bytes on success, negative error
00092      *                  code on failure
00093      */
00094     int sendto(const SocketAddress &address, const void *data, unsigned size);
00095 
00096     /** Receive a packet over a UDP socket
00097      *
00098      *  Receives data and stores the source address in address if address
00099      *  is not NULL. Returns the number of bytes received into the buffer.
00100      *
00101      *  By default, recvfrom blocks until data is sent. If socket is set to
00102      *  non-blocking or times out, NSAPI_ERROR_WOULD_BLOCK is returned
00103      *  immediately.
00104      *
00105      *  @param address  Destination for the source address or NULL
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     int recvfrom(SocketAddress *address, void *data, unsigned size);
00112 
00113 protected:
00114     virtual nsapi_protocol_t get_proto();
00115     virtual void event();
00116 
00117     volatile unsigned _pending;
00118     rtos::Semaphore _read_sem;
00119     rtos::Semaphore _write_sem;
00120     bool _read_in_progress;
00121     bool _write_in_progress;
00122 };
00123 
00124 
00125 #endif
00126 
00127 /** @}*/