Renamed NetworkInterface create/destroy methods to match Socket methods

- socket_create -> socket_open
- socket_destroy -> socket_close

NetworkInterface.h

@@ -89,16 +89,20 @@ protected:
     friend class TCPSocket;
     friend class TCPServer;
 
-    /** Create a socket
-     *  @param proto    The type of socket to open, TCP or UDP
-     *  @return         The alocated socket or null on failure
+    /** Open a socket
+     *  @param handle   Handle in which to store new socket
+     *  @param proto    Type of socket to open, NSAPI_TCP or NSAPI_UDP
+     *  @return         0 on success, negative on failure
      */
-    virtual void *socket_create(nsapi_protocol_t proto) = 0;
+    virtual int socket_open(void **handle, nsapi_protocol_t proto) = 0;
 
-    /** Destroy a socket
-     *  @param socket     Previously allocated socket
+    /** Close the socket
+     *  @param handle   Socket handle
+     *  @return         0 on success, negative on failure
+     *  @note On failure, any memory associated with the socket must still 
+     *        be cleaned up
      */
-    virtual void socket_destroy(void *handle) = 0;
+    virtual int socket_close(void *handle) = 0;
 
     /** Set socket options
      *  @param handle   Socket handle
@@ -147,13 +151,13 @@ protected:
     virtual bool socket_is_connected(void *handle) = 0;
 
     /** Accept a new connection.
-     *  @param handle   Socket handle
-     *  @param socket   A TCPSocket instance that will handle the incoming connection.
-     *  @return         0 on success, negative on failure.
+     *  @param handle   Handle in which to store new socket
+     *  @param server   Socket handle to server to accept from
+     *  @return         0 on success, negative on failure
      *  @note This call is not-blocking, if this call would block, must
      *        immediately return NSAPI_ERROR_WOULD_WAIT
      */
-    virtual int socket_accept(void *handle, void **connection) = 0;
+    virtual int socket_accept(void **handle, void *server) = 0;
 
     /** Send data to the remote host
      *  @param handle   Socket handle
@@ -199,11 +203,6 @@ protected:
      */
     virtual int socket_recvfrom(void *handle, SocketAddress *address, void *buffer, unsigned size) = 0;
 
-    /** Close the socket
-     *  @param handle   Socket handle
-     */
-    virtual int socket_close(void *handle) = 0;
-
     /** Register a callback on state change of the socket
      *  @param handle   Socket handle
      *  @param callback Function to call on state change

Socket.cpp

@@ -34,8 +34,17 @@ Socket::~Socket()
 int Socket::open(NetworkInterface *iface, nsapi_protocol_t proto)
 {
     _iface = iface;
-    _socket = _iface->socket_create(proto);
+
+    void *socket;
+    int err = _iface->socket_open(&socket, proto);
+    if (err) {
+        return err;
+    }
+
+    _socket = socket;
     _iface->socket_attach(_socket, &Socket::thunk, this);
+
+    return 0;
 }
 
 int Socket::close()
@@ -44,14 +53,9 @@ int Socket::close()
         return 0;
     }
 
-    int err = _iface->socket_close(_socket);
-    if (!err) {
-        void *socket = _socket;
-        _socket = 0;
-        _iface->socket_destroy(socket);
-    }
-
-    return err;
+    void *socket = _socket;
+    _socket = 0;
+    return _iface->socket_close(socket);
 }
 
 void Socket::set_blocking(bool blocking)

TCPServer.cpp

@@ -64,9 +64,8 @@ int TCPServer::accept(TCPSocket *connection)
         }
 
         void *socket;
-        int err = _iface->socket_accept(_socket, &socket);
-
-        if (err > 0) {
+        int err = _iface->socket_accept(&socket, _socket);
+        if (!err) {
             connection->_socket = socket;
         }