An IODevice supporting a TCP or UNIX server socket. More...

#include <ServerSocketIODevice.h>

Inheritance diagram for nidas::core::ServerSocketIODevice:

Public Member Functions
	ServerSocketIODevice ()
	Create a SocketIODevice. More...

virtual	~ServerSocketIODevice ()

int	getReadFd () const
	The file descriptor used when reading from this SocketIODevice. More...

int	getWriteFd () const
	The file descriptor used when writing to this sensor. More...

void	open (int flags) throw (nidas::util::IOException,nidas::util::InvalidParameterException)
	open the socket. More...

size_t	read (void *buf, size_t len) throw (nidas::util::IOException)
	Read from the sensor. More...

size_t	read (void *buf, size_t len, int msecTimeout) throw (nidas::util::IOException)
	Read from the sensor with a timeout in milliseconds. More...

size_t	write (const void *buf, size_t len) throw (nidas::util::IOException)
	Write to the sensor. More...

void	ioctl (int, void *, size_t) throw (nidas::util::IOException)

void	close () throw (nidas::util::IOException)
	close the sensor (and any associated FIFOs). More...

void	setTcpNoDelay (bool val) throw (nidas::util::IOException)

bool	getTcpNoDelay () throw (nidas::util::IOException)

virtual void	setName (const std::string &val)
	Set the device name to be opened for this sensor. More...

virtual const std::string &	getName () const

virtual size_t	getBytesAvailable () const throw (nidas::util::IOException)
	Return how many bytes are available to read on this IODevice. More...

Protected Member Functions
void	closeServerSocket () throw (nidas::util::IOException)

Private Member Functions
	ServerSocketIODevice (const ServerSocketIODevice &)
	No copying. More...

ServerSocketIODevice &	operator= (const ServerSocketIODevice &)
	No assignment. More...

Private Attributes
int	_addrtype
	The type of the destination address, AF_INET or AF_UNIX. More...

std::string	_unixPath
	Path name of AF_UNIX socket. More...

int	_sockPort
	Port number that is parsed from sensor name. More...

nidas::util::auto_ptr < nidas::util::SocketAddress >	_sockAddr
	The destination socket address. More...

nidas::util::ServerSocket *	_serverSocket
	The listen socket. More...

nidas::util::Socket *	_socket

bool	_tcpNoDelay

Detailed Description

An IODevice supporting a TCP or UNIX server socket.

This class has a critical limitation and isn't currently used anywhere in NIDAS. The IODevice::open() method should not block, and this class violates that because open() does a nidas::util::ServerSocket::accept() which can block forever. To really support this class we need to spawn a ServerSocket listening thread.

Constructor & Destructor Documentation

ServerSocketIODevice::ServerSocketIODevice ( )

Create a SocketIODevice.

No IO operations to the sensor are performed in the constructor (hence no IOExceptions).

ServerSocketIODevice::~ServerSocketIODevice ( )

virtual

References close(), and closeServerSocket().

nidas::core::ServerSocketIODevice::ServerSocketIODevice ( const ServerSocketIODevice & )

private

No copying.

Member Function Documentation

void ServerSocketIODevice::close	(		)
throw	(	nidas::util::IOException
	)

virtual

close the sensor (and any associated FIFOs).

Implements nidas::core::IODevice.

References _socket, nidas::util::Socket::close(), nidas::util::Socket::getFd(), nidas::util::Logger::getInstance(), nidas::core::IODevice::getName(), nidas::util::Logger::log(), and LOG_INFO.

Referenced by open(), and ~ServerSocketIODevice().

void ServerSocketIODevice::closeServerSocket	(		)
throw	(	nidas::util::IOException
	)

protected

References _serverSocket, nidas::util::ServerSocket::close(), and nidas::util::ServerSocket::getFd().

Referenced by ~ServerSocketIODevice().

virtual size_t nidas::core::IODevice::getBytesAvailable	(		)	const
throw	(	nidas::util::IOException
	)

inlinevirtualinherited

Return how many bytes are available to read on this IODevice.

This method is only useful when ioctl FIONREAD is supported on this this IODevice, as for example with a UDP socket. It is not available, and not necessary, on most other devices, like serial ports, TCP sockets, or devices with nidas driver module support, in which case it will return an nidas::util::IOException. It is an optimization for use with UDP sockets, where after select determines that data is available on the socket file descriptor, a read will only read one datagram, even if there are more than one packet available, which would not be optimal if a sensor generated many small packets. Rather than returning back to select, we check if there are more datagrams to read. This is not necessary on other types of IODevices, where it is just a matter of using a big enough buffer to get all (or most) available data after a select.

According to man udp(7), FIONREAD will return 0 if the size of the next packet is 0. So, if select/poll indicate there is data available, one read at least should be done, just in case a sensor sends a datagram of length 0, otherwise it will never be consumed.

References err, nidas::core::IODevice::getName(), nidas::core::IODevice::getReadFd(), and nidas::core::IODevice::ioctl().

Referenced by nidas::core::DSMSensor::getBytesAvailable().

virtual const std::string& nidas::core::IODevice::getName ( ) const

inlinevirtualinherited

References nidas::core::IODevice::_devname.

Referenced by nidas::core::SerialPortIODevice::applyTermios(), nidas::core::TCPSocketIODevice::close(), nidas::core::UDPSocketIODevice::close(), close(), nidas::core::UnixIODevice::close(), nidas::core::IODevice::getBytesAvailable(), nidas::core::SocketIODevice::ioctl(), ioctl(), nidas::core::UnixIODevice::ioctl(), nidas::core::SocketIODevice::open(), open(), nidas::core::UnixIODevice::open(), nidas::core::UnixIODevice::read(), and nidas::core::UnixIODevice::write().

int nidas::core::ServerSocketIODevice::getReadFd ( ) const

inlinevirtual

The file descriptor used when reading from this SocketIODevice.

Implements nidas::core::IODevice.

References _socket, and nidas::util::Socket::getFd().

bool nidas::core::ServerSocketIODevice::getTcpNoDelay	(		)
throw	(	nidas::util::IOException
	)

inline

References _tcpNoDelay.

Referenced by open().

int nidas::core::ServerSocketIODevice::getWriteFd ( ) const

inlinevirtual

The file descriptor used when writing to this sensor.

Implements nidas::core::IODevice.

References _socket, and nidas::util::Socket::getFd().

void nidas::core::ServerSocketIODevice::ioctl	(	int	,
		void *	,
		size_t
	)
throw	(	nidas::util::IOException
	)

inlinevirtual

Implements nidas::core::IODevice.

References nidas::core::IODevice::getName().

void ServerSocketIODevice::open	(	int	flags	)
throw	(	nidas::util::IOException,
		nidas::util::InvalidParameterException
	)

virtual

open the socket.

Implements nidas::core::IODevice.

References _addrtype, _serverSocket, _sockAddr, _socket, _sockPort, _unixPath, nidas::util::ServerSocket::accept(), close(), nidas::util::Inet4Address::getByName(), nidas::core::IODevice::getName(), getTcpNoDelay(), nidas::core::SocketIODevice::parseAddress(), nidas::util::ServerSocket::setNonBlocking(), and nidas::util::Exception::what().

ServerSocketIODevice& nidas::core::ServerSocketIODevice::operator= ( const ServerSocketIODevice & )

private

No assignment.

size_t nidas::core::ServerSocketIODevice::read	(	void *	buf,
		size_t	len
	)
throw	(	nidas::util::IOException
	)

inlinevirtual

Read from the sensor.

Implements nidas::core::IODevice.

References _socket, len, and nidas::util::Socket::recv().

size_t nidas::core::ServerSocketIODevice::read	(	void *	buf,
		size_t	len,
		int	msecTimeout
	)
throw	(	nidas::util::IOException
	)

inlinevirtual

Read from the sensor with a timeout in milliseconds.

Implements nidas::core::IODevice.

References _socket, len, nidas::util::Socket::recv(), and nidas::util::Socket::setTimeout().

virtual void nidas::core::IODevice::setName ( const std::string & val )

inlinevirtualinherited

Set the device name to be opened for this sensor.

References nidas::core::IODevice::_devname.

Referenced by nidas::core::UnixIODevice::UnixIODevice().

void nidas::core::ServerSocketIODevice::setTcpNoDelay	(	bool	val	)
throw	(	nidas::util::IOException
	)

inline

References _tcpNoDelay.

Referenced by nidas::dynld::raf::CVI_LV_Input::buildIODevice().

size_t nidas::core::ServerSocketIODevice::write	(	const void *	buf,
		size_t	len
	)
throw	(	nidas::util::IOException
	)

inlinevirtual

Write to the sensor.

Implements nidas::core::IODevice.

References _socket, len, and nidas::util::Socket::send().

Member Data Documentation

int nidas::core::ServerSocketIODevice::_addrtype

private

The type of the destination address, AF_INET or AF_UNIX.

Referenced by open().

nidas::util::ServerSocket* nidas::core::ServerSocketIODevice::_serverSocket

private

The listen socket.

This isn't in an auto_ptr because one must close the socket prior to deleting it. The nidas::util::Socket destructor does not close the file descriptor.

Referenced by closeServerSocket(), and open().

nidas::util::auto_ptr<nidas::util::SocketAddress> nidas::core::ServerSocketIODevice::_sockAddr

private

The destination socket address.

Referenced by open().

nidas::util::Socket* nidas::core::ServerSocketIODevice::_socket

private

Referenced by close(), getReadFd(), getWriteFd(), open(), read(), and write().