Unix datagram socket class. More...

#include <simple_socket/UnixDatagramSocket.h>

Inheritance diagram for NET::UnixDatagramSocket:

Collaboration diagram for NET::UnixDatagramSocket:

Public Types
enum	ShutdownDirection { STOP_SEND = SHUT_WR , STOP_RECEIVE = SHUT_RD , STOP_BOTH = SHUT_RDWR }

Public Member Functions
	UnixDatagramSocket ()
void	sendTo (const void *buffer, size_t len, std::string_view foreignPath)
int	receiveFrom (void *buffer, size_t len, std::string &sourcePath)
int	timedReceiveFrom (void *buffer, size_t len, std::string &sourcePath, int timeout)
void	connect (std::string_view foreignPath)
void	bind (std::string_view localPath)
std::string	getLocalPath () const
std::string	getForeignPath () const
int	nativeHandle () noexcept
	return the native handle of the open socket
int	send (const void *buffer, size_t len)
	send data through a connected socket
int	receive (void *buffer, size_t len)
	receive data from a bound socket
int	timedReceive (void *buffer, size_t len, int timeout)
	receive data from a bound socket, return after the given timespan
void	disconnect ()
	Disconnect and unset any foreign addresses.
void	shutdown (ShutdownDirection type)
	shutdown the connection in the specified direction
bool	peerDisconnected () const noexcept
	returns whether a currently associated peer disconnected

Protected Member Functions
void	listen (int backlog=5)
	listen for incoming connections
int	sendAll (const void *buffer, size_t len)
	send data through a connected socket
int	receiveAll (void *buffer, size_t len)
	receive exactly the requested amount unless the peer disconnects
int	accept () const
	allows stream sockets to accept connections into Handles
int	timedAccept (int timeout) const
	allows stream sockets timed accept

Protected Attributes
std::string	m_boundPath
int	m_socket
bool	m_peerDisconnected
bool	m_connectionOriented

Detailed Description

Unix datagram socket class.

Definition at line 9 of file UnixDatagramSocket.h.

Member Enumeration Documentation

◆ ShutdownDirection

enum NET::SimpleSocket::ShutdownDirection

inherited

Enumerator
STOP_SEND	disable all variants of send() on the socket, receive calls still work
STOP_RECEIVE	disable all variants of receive() on the socket, send calls still work
STOP_BOTH	disable all send() and receive() calls on the socket

Definition at line 57 of file SimpleSocket.h.

Constructor & Destructor Documentation

◆ UnixDatagramSocket()

UnixDatagramSocket::UnixDatagramSocket ( )

Construct a Unix datagram socket

Exceptions

SocketException thrown if unable to create the socket

Definition at line 10 of file UnixDatagramSocket.cpp.

Member Function Documentation

◆ accept()

int SimpleSocket::accept ( ) const

protectedinherited

allows stream sockets to accept connections into Handles

Definition at line 144 of file SimpleSocket.cpp.

◆ bind()

void UnixSocket::bind ( std::string_view localPath )

inherited

Set the local path to the specified path

Parameters

localPath specifies where the socket should be bound

Exceptions

SocketException thrown if setting local path fails

Definition at line 33 of file UnixSocket.cpp.

◆ connect()

void UnixSocket::connect ( std::string_view foreignPath )

inherited

Establish a socket connection with the given socket

Parameters

foreignPath the path of the remote socket

Exceptions

SocketException thrown if unable to establish connection

Definition at line 23 of file UnixSocket.cpp.

◆ disconnect()

void SimpleSocket::disconnect ( )

inherited

Disconnect and unset any foreign addresses.

This will ungracefully abort the connection by sending an RST frame. disconnect() should not be used under normal circumstances, as it will terminate the connection OOB, preventing the other end of the communication from retrieving data that would still be available in the OS buffer.

For normal termination of a connection use shutdown().

Exceptions

SocketException thrown if unable to disconnect

Definition at line 112 of file SimpleSocket.cpp.

◆ getForeignPath()

std::string UnixSocket::getForeignPath ( ) const

inherited

Get the foreign path. Call connect() before using this function.

Returns: foreign path

Exceptions

SocketException thrown if fetch fails

Definition at line 53 of file UnixSocket.cpp.

◆ getLocalPath()

std::string UnixSocket::getLocalPath ( ) const

inherited

Get the local path (after binding the socket)

Returns: local path of socket

Exceptions

SocketException thrown if fetch fails

Definition at line 43 of file UnixSocket.cpp.

◆ listen()

void SimpleSocket::listen ( int backlog = 5 )

protectedinherited

listen for incoming connections

listen() can be called on a bound socket. The socket will then go into a passive state and accept incoming connections. To answer to an incoming connection call accept() or timedAccept() on the socket.

The backlog is a buffer for incoming connections. If backlog is set to 0, the number of incoming connections is only limited by the operating system. If backlog is set to a value > 0, only the upper limit of connections is set, the OS can limit the number further.

After starting to listen, use accept to accept incoming connections.

Parameters

backlog upper limit of pending incoming connections

Exceptions

SocketException

Definition at line 137 of file SimpleSocket.cpp.

◆ nativeHandle()

int NET::SimpleSocket::nativeHandle ( )

inlinenoexceptinherited

return the native handle of the open socket

Definition at line 68 of file SimpleSocket.h.

◆ peerDisconnected()

bool SimpleSocket::peerDisconnected ( ) const

noexceptinherited

returns whether a currently associated peer disconnected

For stream sockets this is set when the peer closes or resets the connection. Use this function after a call to receive, returned 0 received bytes.

For connected datagram sockets it may also be set when the network reports that the configured peer is unreachable.

The flag is cleared by a successful connect().

Returns: true if a peer disconnected

Examples: TCP_Client.cpp.

Definition at line 132 of file SimpleSocket.cpp.

◆ receive()

int SimpleSocket::receive	(	void *	buffer,
		size_t	len )

inherited

receive data from a bound socket

receive() can only be used on a socket that called bind() or connect() before. If you try to use receive() on a not bound socket, SocketException will be thrown.

If using a stream oriented Socket, receive can return a part of a received messge, e.g. if you send 100 bytes, it's possible you will receive 50 bytes two times in a row. However, the order of the sent data will be preserved.

If you are using a datagram oriented sockets, you will only receive whole datagrams. But beware of using a too small buffer. If the receive buffer is too small for the received datagram, the data you didn't read in the receive call will be discared.

If the remote host has closed the connection (on a connection based socket like TCP or SCTP) receive() will return 0. If you are using a connectionless protocol (like UDP) there is no way to determine wheter the connection has been closed by the remote host or not.

Parameters

buffer	the buffer the received data will be written to
len	length of the provided buffer, receive will not read more than that

Returns: number of bytes received

Exceptions

SocketException in case an error occured

Definition at line 70 of file SimpleSocket.cpp.

◆ receiveAll()

int SimpleSocket::receiveAll	(	void *	buffer,
		size_t	len )

protectedinherited

receive exactly the requested amount unless the peer disconnects

receiveAll() repeatedly calls receive() until len bytes have been received. This is useful for fixed-size data on TCP, where one receive() call is not guaranteed to return all bytes sent by the peer.

If the peer closes or resets the connection before len bytes arrive, the function returns the number of bytes received so far. In that case peerDisconnected() is set by the underlying receive() call.

Parameters

buffer	buffer the received data will be written to
len	number of bytes to receive

Returns: number of bytes received

Exceptions

SocketException on receive errors other than peer loss

Definition at line 188 of file SimpleSocket.cpp.

◆ receiveFrom()

int UnixDatagramSocket::receiveFrom	(	void *	buffer,
		size_t	len,
		std::string &	sourcePath )

Read read up to len bytes data from this socket. The given buffer is where the data will be placed.

Parameters

buffer	buffer to receive data
len	maximum number of bytes to receive
sourcePath	path where the data originated

Returns: number of bytes received

Exceptions

SocketException thrown if unable to receive datagram

Definition at line 25 of file UnixDatagramSocket.cpp.

◆ send()

int SimpleSocket::send	(	const void *	buffer,
		size_t	len )

inherited

send data through a connected socket

send() can only be used on a socket that called connect() before. If you try to use send() on a not connected socket, SocketException will be thrown.

If you are using a stream oriented socket (like TCPSocket), the operating system is allowed to send only a part of the packet you told it to send, so send() will return the number of bytes actually sent. It is your responsibility to resend the data not sent by send()

If you are using a datagram oriented socket (like UDPSocket or SCTPSocket) the operating system will only send and receive complete datagrams, but send() will fail if you are trying to send too much data. In that case SocketException will be thrown.

Parameters

buffer	data to be send
len	length of the data to be sent

Returns: number of bytes sent

Exceptions

SocketException if sending went wrong

Definition at line 50 of file SimpleSocket.cpp.

◆ sendAll()

int SimpleSocket::sendAll	(	const void *	buffer,
		size_t	len )

protectedinherited

send data through a connected socket

sendAll() can only be used on a socket that called connect() before. If you try to use sendAll() on a unconnected socket, a SocketException will be thrown.

When using a stream oriented socket, the operating system is allowed to send only a bit of the data you requested it to send. Because of this, you would have to check the number of sent bytes when using send(), and resend unsent data manually. sendAll() takes that responsibility from you and resends as long as it needs, to completely send the data given to it.

Parameters

buffer	data to be send
len	length of the data to be sent

Returns: number of bytes sent

Exceptions

SocketException

Definition at line 175 of file SimpleSocket.cpp.

◆ sendTo()

void UnixDatagramSocket::sendTo	(	const void *	buffer,
		size_t	len,
		std::string_view	foreignPath )

Send the given buffer as a datagram to the specified address / port.

Parameters

buffer	data to be send
len	number of bytes to write
foreignPath	filename of the datagram socket the data should be sent to

Exceptions

SocketException thrown if unable to send datagram

Definition at line 14 of file UnixDatagramSocket.cpp.

◆ shutdown()

void SimpleSocket::shutdown ( ShutdownDirection type )

inherited

shutdown the connection in the specified direction

This will gracefully end a connection by sending a FIN frame. Use this to end a normal communication cycle. To abort a connection see disconnect().

Depending on the specified ShutdownDirection, calls for that direction will stop working. Use this function if you want to have more control than just destroing the socket. It allows you to cut the connection in one direction, or both.

If you use shutdown() on an unconnected socket, the corresponding calls will simply stop working.

Parameters

type	the ShutdownDirection that be used

Exceptions

SocketException in case an error occured

Examples: TCP_Server.cpp.

Definition at line 126 of file SimpleSocket.cpp.

◆ timedAccept()

int SimpleSocket::timedAccept ( int timeout ) const

protectedinherited

allows stream sockets timed accept

Definition at line 158 of file SimpleSocket.cpp.

◆ timedReceive()

int SimpleSocket::timedReceive	(	void *	buffer,
		size_t	len,
		int	timeout )

inherited

receive data from a bound socket, return after the given timespan

timedReceive() can only be used on a socket that called bind() or connect before. If you try to use receive() on a not bound socket, SocketException will be thrown.

If using a stream oriented Socket, receive can return a part of a received messge, e.g. if you send 100 bytes, it's possible you will receive 50 bytes two times in a row. However, the order of the sent data will be preserved.

If you are using a datagram oriented sockets, you will only receive whole datagrams. But beware of using a too small buffer. If the receive buffer is too small for the received datagram, the data you didn't read in the receive call will be discared.

If the remote host has closed the connection (on a connection based socket like TCP or SCTP) receive() will return 0. If you are using a connectionless protocol (like UDP) there is no way to determine wheter the connection has been closed by the remote host or not.

Parameters

buffer	the buffer the received data will be written to
len	length of the provided buffer, receive will not read more than that
timeout	the timeout in ms after which receive will give up and return

Returns: number of bytes received, 0 on timeout

Exceptions

SocketException in case an error occured

Examples: TCP_Client.cpp.

Definition at line 89 of file SimpleSocket.cpp.

◆ timedReceiveFrom()

int UnixDatagramSocket::timedReceiveFrom	(	void *	buffer,
		size_t	len,
		std::string &	sourcePath,
		int	timeout )

Read read up to len bytes data from this socket. The given buffer is where the data will be placed. If no host has sent a datagram before the timeout runs out, the function will return without changing the buffer.

Parameters

buffer	buffer to receive data
len	maximum number of bytes to receive
sourcePath	path where the data originated
timeout	timeout in milliseconds

Returns: number of bytes received, 0 on timeout

Exceptions

SocketException thrown if unable to receive datagram

Definition at line 37 of file UnixDatagramSocket.cpp.

Member Data Documentation

◆ m_boundPath

std::string NET::UnixSocket::m_boundPath

protectedinherited

Definition at line 53 of file UnixSocket.h.

◆ m_connectionOriented

bool NET::SimpleSocket::m_connectionOriented

protectedinherited

Definition at line 268 of file SimpleSocket.h.

◆ m_peerDisconnected

bool NET::SimpleSocket::m_peerDisconnected

protectedinherited

Definition at line 267 of file SimpleSocket.h.

◆ m_socket

int NET::SimpleSocket::m_socket

protectedinherited

Definition at line 266 of file SimpleSocket.h.

The documentation for this class was generated from the following files:

include/simple_socket/UnixDatagramSocket.h
src/UnixDatagramSocket.cpp

simple-socket library 1.5.0

Public Types

Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Member Enumeration Documentation

◆ ShutdownDirection

Constructor & Destructor Documentation

◆ UnixDatagramSocket()

Member Function Documentation

◆ accept()

◆ bind()

◆ connect()

◆ disconnect()

◆ getForeignPath()

◆ getLocalPath()

◆ listen()

◆ nativeHandle()

◆ peerDisconnected()

◆ receive()

◆ receiveAll()

◆ receiveFrom()

◆ send()

◆ sendAll()

◆ sendTo()

◆ shutdown()

◆ timedAccept()

◆ timedReceive()

◆ timedReceiveFrom()

Member Data Documentation

◆ m_boundPath

◆ m_connectionOriented

◆ m_peerDisconnected

◆ m_socket