mirror of https://github.com/ARMmbed/mbed-os.git
288 lines
12 KiB
C++
288 lines
12 KiB
C++
/*
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* Copyright (c) 2015 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/** @file Socket.h Abstract Socket interface */
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/** @addtogroup netsocket
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* Mbed OS Socket API
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* @{ */
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#ifndef SOCKET_H
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#define SOCKET_H
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#include "netsocket/SocketAddress.h"
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#include "Callback.h"
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/** Socket interface.
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*
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* This class defines the Mbed OS Socket API.
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* Socket is an abstract interface for communicating with remote endpoints.
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*
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* This API is intended for applications and libraries instead of
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* protocol-specific implementations. For example, TCPSocket
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* and UDPSocket are implementations of the Socket interface.
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* Socket API is intentionally not protocol-specific, and allows all protocol
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* to provide the same API regardless of the underlying transport mechanism.
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*/
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class Socket {
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public:
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/** Destroy a socket.
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*
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* Closes socket if the socket is still open.
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*/
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virtual ~Socket() {}
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/** Closes the socket.
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*
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* Closes any open connection and deallocates any memory associated
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* with the socket. Called from destructor if socket is not closed.
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*
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* @return NSAPI_ERROR_OK on success, negative error code on failure
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*/
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virtual nsapi_error_t close() = 0;
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/** Connects socket to a remote address.
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*
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* Attempts to make connection on connection-mode protocol or set or reset
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* the peer address on connectionless protocol.
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*
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* Connectionless protocols also use the connected address to filter
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* incoming packets for recv() and recvfrom() calls.
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*
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* To reset the peer address, there must be zero initialized(default constructor) SocketAddress
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* objects in the address parameter.
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*
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* @note If connect() fails it is recommended to close the Socket and create
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* a new one before attempting to reconnect.
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*
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* @param address The SocketAddress of the remote peer.
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* @return NSAPI_ERROR_OK on success, negative error code on failure.
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*/
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virtual nsapi_error_t connect(const SocketAddress &address) = 0;
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/** Send data on a socket
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*
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* The socket must be connected to a remote host before send() call.
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* Returns the number of bytes sent from the buffer.
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* In case of connectionless socket, sends data to pre-specified remote.
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*
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* By default, send blocks until all data is sent. If socket is set to
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* non-blocking or times out, a partial amount can be written.
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* NSAPI_ERROR_WOULD_BLOCK is returned if no data was written.
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*
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* @param data Buffer of data to send to the host.
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* @param size Size of the buffer in bytes.
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* @return Number of sent bytes on success, negative error
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* code on failure.
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*/
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virtual nsapi_size_or_error_t send(const void *data, nsapi_size_t size) = 0;
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/** Receive data from a socket.
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*
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* Receive data from connected socket, or in the case of connectionless socket,
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* equivalent to calling recvfrom(NULL, data, size).
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*
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* If socket is connected, only packets coming from connected peer address
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* are accepted.
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*
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* @note recv() is allowed write to data buffer even if an error occurs.
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*
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* By default, recv blocks until some data is received. If socket is set to
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* non-blocking or times out, NSAPI_ERROR_WOULD_BLOCK can be returned to
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* indicate no data.
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*
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* @param data Destination buffer for data received from the host.
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* @param size Size of the buffer in bytes.
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* @return Number of received bytes on success, negative error
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* code on failure. If no data is available to be received
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* and the peer has performed an orderly shutdown,
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* recv() returns 0.
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*/
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virtual nsapi_size_or_error_t recv(void *data, nsapi_size_t size) = 0;
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/** Send a message on a socket.
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*
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* The sendto() function sends a message through a connection-mode or connectionless-mode socket.
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* If the socket is a connectionless-mode socket, the message is sent to the address specified.
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* If the socket is a connected-mode socket, address is ignored.
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*
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* By default, sendto blocks until data is sent. If socket is set to
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* non-blocking or times out, NSAPI_ERROR_WOULD_BLOCK is returned
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* immediately.
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*
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* @param address Remote address
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* @param data Buffer of data to send to the host
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* @param size Size of the buffer in bytes
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* @return Number of sent bytes on success, negative error
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* code on failure
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*/
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virtual nsapi_size_or_error_t sendto(const SocketAddress &address,
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const void *data, nsapi_size_t size) = 0;
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/** Receive a data from a socket
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*
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* Receives a data and stores the source address in address if address
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* is not NULL. Returns the number of bytes written into the buffer.
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*
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* If socket is connected, only packets coming from connected peer address
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* are accepted.
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*
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* @note recvfrom() is allowed write to address and data buffers even if error occurs.
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*
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* By default, recvfrom blocks until a datagram is received. If socket is set to
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* non-blocking or times out with no data, NSAPI_ERROR_WOULD_BLOCK
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* is returned.
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*
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* @param address Destination for the source address or NULL
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* @param data Destination buffer for datagram received from the host
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* @param size Size of the buffer in bytes
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* @return Number of received bytes on success, negative error
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* code on failure
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*/
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virtual nsapi_size_or_error_t recvfrom(SocketAddress *address,
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void *data, nsapi_size_t size) = 0;
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/** Bind a specific address to a socket.
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*
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* Binding a socket specifies the address and port on which to receive
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* data. If the IP address is zeroed, only the port is bound.
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*
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* @param address Local address to bind.
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* @return NSAPI_ERROR_OK on success, negative error code on failure.
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*/
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virtual nsapi_error_t bind(const SocketAddress &address) = 0;
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/** Set blocking or non-blocking mode of the socket.
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*
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* Initially all sockets are in blocking mode. In non-blocking mode
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* blocking operations such as send/recv/accept return
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* NSAPI_ERROR_WOULD_BLOCK if they cannot continue.
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*
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* set_blocking(false) is equivalent to set_timeout(0)
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* set_blocking(true) is equivalent to set_timeout(-1)
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*
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* @param blocking true for blocking mode, false for non-blocking mode.
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*/
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virtual void set_blocking(bool blocking) = 0;
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/** Set timeout on blocking socket operations.
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*
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* Initially all sockets have unbounded timeouts. NSAPI_ERROR_WOULD_BLOCK
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* is returned if a blocking operation takes longer than the specified
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* timeout. A timeout of 0 removes the timeout from the socket. A negative
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* value gives the socket an unbounded timeout.
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*
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* set_timeout(0) is equivalent to set_blocking(false)
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* set_timeout(-1) is equivalent to set_blocking(true)
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*
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* @param timeout Timeout in milliseconds
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*/
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virtual void set_timeout(int timeout) = 0;
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/** Register a callback on state change of the socket.
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*
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* The specified callback is called on state changes, such as when
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* the socket can receive/send/accept successfully and when an error
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* occurs. The callback may also be called spuriously without reason.
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*
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* The callback may be called in an interrupt context and should not
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* perform expensive operations such as receive/send calls.
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*
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* Note! This is not intended as a replacement for a poll or attach-like
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* asynchronous API, but rather as a building block for constructing
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* such functionality. The exact timing of the registered function
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* is not guaranteed and susceptible to change.
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*
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* @param func Function to call on state change.
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*/
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virtual void sigio(mbed::Callback<void()> func) = 0;
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/** Set socket options.
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*
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* setsockopt() allows an application to pass stack-specific options
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* to the underlying stack using stack-specific level and option names,
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* or to request generic options using levels from nsapi_socket_level_t.
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*
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* For unsupported options, NSAPI_ERROR_UNSUPPORTED is returned
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* and the socket is unmodified.
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*
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* @param level Stack-specific protocol level or nsapi_socket_level_t.
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* @param optname Level-specific option name.
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* @param optval Option value.
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* @param optlen Length of the option value.
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* @return NSAPI_ERROR_OK on success, negative error code on failure.
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*/
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virtual nsapi_error_t setsockopt(int level, int optname, const void *optval, unsigned optlen) = 0;
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/** Get socket options.
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*
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* getsockopt() allows an application to retrieve stack-specific options
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* from the underlying stack using stack-specific level and option names,
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* or to request generic options using levels from nsapi_socket_level_t.
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*
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* For unsupported options, NSAPI_ERROR_UNSUPPORTED is returned
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* and the socket is unmodified.
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*
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* @param level Stack-specific protocol level or nsapi_socket_level_t.
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* @param optname Level-specific option name.
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* @param optval Destination for option value.
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* @param optlen Length of the option value.
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* @return NSAPI_ERROR_OK on success, negative error code on failure.
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*/
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virtual nsapi_error_t getsockopt(int level, int optname, void *optval, unsigned *optlen) = 0;
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/** Accepts a connection on a socket.
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*
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* The server socket must be bound and set to listen for connections.
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* On a new connection, returns connected network socket to call close()
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* that deallocates the resources. Referencing a returned pointer after a close()
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* call is not allowed and leads to undefined behavior.
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*
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* By default, accept blocks until incoming connection occurs. If socket is set to
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* non-blocking or times out, error is set to NSAPI_ERROR_WOULD_BLOCK.
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*
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* @param error Pointer to storage of the error value or NULL.
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* @return Pointer to a socket.
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*/
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virtual Socket *accept(nsapi_error_t *error = NULL) = 0;
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/** Listen for incoming connections.
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*
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* Marks the socket as a passive socket that can be used to accept
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* incoming connections.
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*
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* @param backlog Number of pending connections that can be queued
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* simultaneously, defaults to 1.
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* @return NSAPI_ERROR_OK on success, negative error code on failure.
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*/
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virtual nsapi_error_t listen(int backlog = 1) = 0;
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/** Get the remote-end peer associated with this socket.
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*
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* Copy the remote peer address to a SocketAddress structure pointed by
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* address parameter. Socket must be connected to have a peer address
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* associated.
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*
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* @param address Pointer to SocketAddress structure.
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* @return NSAPI_ERROR_OK on success, negative error code on failure.
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*/
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virtual nsapi_error_t getpeername(SocketAddress *address) = 0;
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};
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#endif
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/** @}*/
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