ost::TCPStream Class Reference

TCP streams are used to represent TCP client connections to a server by TCP protocol servers for accepting client connections. More...

#include <tcp.h>

Inheritance diagram for ost::TCPStream:

Public Member Functions
void	connect (TCPSocket &server)
	Accept a connection from a TCP Server.
void	connect (TCPV6Socket &server)
void	disconnect (void)
	Disconnect the current session and prepare for a new one.
size_t	getBufferSize (void)
	Return the size of the current stream buffering used.
int	getSegmentSize (void)
	Get protocol segment size.
bool	isPending (Pending pend, timeout_t timeout=ucommon::Timer::inf)
	Get the status of pending stream data.
ssize_t	peek (void *buf, size_t len)
	Examine contents of next waiting packet.
size_t	printf (char *format,...)
	Print content into a socket.
void	setTimeout (timeout_t timer)
	Set the I/O operation timeout for socket I/O operations.
int	sync (void)
	Flushes the stream input and output buffers, writes pending output.
	TCPStream (Family family=IPV4, bool throwflag=true, timeout_t to=0)
	The constructor required for building other classes or to start an unconnected TCPStream for connect.
	TCPStream (TCPSocket &server, bool throwflag=true, timeout_t timeout=0)
	Create a TCP stream by accepting a connection from a bound TCP socket acting as a server.
	TCPStream (TCPV6Socket &server, bool throwflag=true, timeout_t timeout=0)
	TCPStream (IPV4Host &host, tpport_t port, unsigned mss=536, bool throwflag=true, timeout_t timeout=0)
	Create a TCP stream by connecting to a TCP socket (on a remote machine).
	TCPStream (IPV6Host &host, tpport_t port, unsigned mss=536, bool throwflag=true, timeout_t timeout=0)
	TCPStream (char *name, Family family=IPV4, unsigned mss=536, bool throwflag=false, timeout_t timer=0)
	Construct a named TCP Socket connected to a remote machine.
virtual	~TCPStream ()
	Flush and empty all buffers, and then remove the allocated buffers.
Public Member Functions inherited from ost::Socket
struct in_addr	getaddress (IPV4Address &ia)
struct in6_addr	getaddress (IPV6Address &ia)
Error	getErrorNumber (void)
	Often used by a "catch" to fetch the last error of a thrown socket.
char *	getErrorString (void)
	Often used by a "catch" to fetch the user set error string of a thrown socket, but only if EXTENDED error codes are used.
IPV4Host	getIPV4Local (tpport_t *port=((void *) 0))
	Get the local address and port number this socket is currently bound to.
IPV4Host	getIPV4Peer (tpport_t *port=((void *) 0))
	Get the host address and port of the socket this socket is connected to.
virtual IPV4Host	getIPV4Sender (tpport_t *port=((void *) 0))
	May be used to examine the origin of data waiting in the socket receive queue.
IPV6Host	getIPV6Local (tpport_t *port=((void *) 0))
IPV6Host	getIPV6Peer (tpport_t *port=((void *) 0))
virtual IPV6Host	getIPV6Sender (tpport_t *port=((void *) 0))
IPV4Host	getLocal (tpport_t *port=((void *) 0))
IPV4Host	getPeer (tpport_t *port=((void *) 0))
IPV4Host	getSender (tpport_t *port=((void *) 0))
long	getSystemError (void)
char *	getSystemErrorString (void)
bool	isActive (void)
	Test to see if the socket is at least operating or if it is mearly initialized.
bool	isBroadcast (void)
	Return if broadcast has been enabled for the specified socket.
bool	isConnected (void)
	Can test to see if this socket is "connected", and hence whether a "catch" can safely call getPeer().
virtual bool	isPending (Pending pend, timeout_t timeout=ucommon::Timer::inf)
	Get the status of pending operations.
bool	isRouted (void)
	Return if socket routing is enabled.
	operator bool ()
bool	operator! ()
	Operator based testing to see if a socket is currently active.
Socket &	operator= (Socket &from)
	Sockets may also be duplicated by the assignment operator.
void	setCompletion (bool immediate)
	Used to specify blocking mode for the socket.
Error	setKeepAlive (bool enable)
	Set the keep-alive status of this socket and if keep-alive messages will be sent.
Error	setLinger (bool linger)
	Enable lingering sockets on close.
Error	setTypeOfService (Tos service)
	Set packet scheduling on platforms which support ip quality of service conventions.

Protected Member Functions
void	allocate (size_t size)
	Used to allocate the buffer space needed for iostream operations.
void	connect (IPV4Host &host, tpport_t port, unsigned mss=536)
	Create a TCP stream by connecting to a TCP socket (on a remote machine).
void	connect (IPV6Host &host, tpport_t port, unsigned mss=536)
void	connect (char *name, unsigned mss=536)
	Connect a TCP stream to a named destination host and port number, using getaddrinfo interface if available.
void	endStream (void)
	Used to terminate the buffer space and cleanup the socket connection.
int	overflow (int ch)
	This streambuf method is used to write the output buffer through the established tcp connection.
std::iostream *	tcp (void)
	Used in derived classes to refer to the current object via it's iostream.
int	uflow ()
	This streambuf method is used for doing unbuffered reads through the establish tcp socket connection when in interactive mode.
int	underflow ()
	This streambuf method is used to load the input buffer through the established tcp socket connection.
Protected Member Functions inherited from ost::Socket
Error	bufferSize (unsigned size)
	Set the total protocol stack network kernel buffer size for both send and receive together.
Error	connectError (void)
	Used as a common handler for connection failure processing.
Error	drop (IPV4Multicast &ia)
	Drop membership from a multicast group.
Error	drop (IPV6Multicast &ia)
void	endSocket (void)
	Used as the default destructor for ending a socket.
Error	error (Error error, char *err=((void *) 0), long systemError=0)
	This service is used to throw all socket errors which usually occur during the socket constructor.
void	error (char *err)
	This service is used to throw application defined socket errors where the application specific error code is a string.
Error	join (IPV4Multicast &ia)
	Join a multicast group.
Error	join (IPV6Multicast &ia)
virtual ssize_t	readData (void *buf, size_t len, char separator=0, timeout_t t=0)
	Read in a block of len bytes with specific separator.
ssize_t	readLine (char *buf, size_t len, timeout_t timeout=0)
	Process a logical input line from a socket descriptor directly.
Error	receiveBuffer (unsigned size)
	Set the protocol stack network kernel receive buffer size associated with the socket.
Error	receiveLimit (int limit=1)
	Set thr receive limit.
Error	receiveTimeout (timeout_t timer)
	Receive timeout for receiving raw network data.
Error	sendBuffer (unsigned size)
	Set the protocol stack network kernel send buffer size associated with the socket.
Error	sendLimit (int limit=2048)
	Set the send limit.
Error	sendTimeout (timeout_t timer)
	Set the send timeout for sending raw network data.
Error	setBroadcast (bool enable)
	Set the subnet broadcast flag for the socket.
void	setError (bool enable)
	This service is used to turn the error handler on or off for "throwing" exceptions by manipulating the thrown flag.
Error	setLoopbackByFamily (bool enable, Family family=IPV4)
	Set the multicast loopback flag for the socket.
Error	setMulticastByFamily (bool enable, Family family=IPV4)
	Setting multicast binds the multicast interface used for the socket to the interface the socket itself has been implicitly bound to.
Error	setNoDelay (bool enable)
	Enable/disable delaying packets (Nagle algorithm)
Error	setRouting (bool enable)
	Set the socket routing to indicate if outgoing messages should bypass normal routing (set false).
Error	setTimeToLiveByFamily (unsigned char ttl, Family fam=IPV4)
	Set the multicast time to live for a multicast socket.
	Socket (int domain, int type, int protocol=0)
	An unconnected socket may be created directly on the local machine.
	Socket (socket_t fd)
	A socket object may be created from a file descriptor when that descriptor was created either through a socket() or accept() call.
	Socket ()
	Create an inactive socket object for base constructors.
	Socket (Socket &source)
	A socket can also be constructed from an already existing Socket object.
virtual ssize_t	writeData (void *buf, size_t len, timeout_t t=0)
	Write a block of len bytes to socket.
Protected Member Functions inherited from ucommon::Socket
int	blocking (bool enable)
	Set socket blocking I/O mode.
int	broadcast (bool enable)
	Set socket for unicast mode broadcasts.
void	cancel (void)
	Cancel pending i/o by shutting down the socket.
int	connectto (struct addrinfo *list)
	Connect our socket to a remote host from an address list.
int	drop (struct addrinfo *list)
	Drop socket from multicast group.
int	err (void)
	Get error code.
int	getError (void)
	Get socket error code.
unsigned	getPending (void)
	Get the number of bytes of data in the socket receive buffer.
int	gettype (void)
	Get the type of a socket.
bool	isConnected (void)
	Test if socket is connected.
bool	isPending (unsigned value)
	See the number of bytes in the receive queue.
int	join (struct addrinfo *list)
	Join socket to multicast group.
int	keepalive (bool enable)
	Set socket for keepalive packets.
int	loopback (bool enable)
	Set loopback to read multicast packets we broadcast.
int	multicast (unsigned ttl=1)
	Set multicast mode and multicast broadcast range.
int	nodelay (void)
	Set nodelay option for tcp socket.
	operator bool ()
	Test if socket is valid.
	operator socket_t ()
	Get the socket descriptor by casting.
bool	operator! ()
	Test if socket is invalid.
socket_t	operator* ()
	Get the socket descriptor by pointer reference.
Socket &	operator= (socket_t socket)
	Assign socket from a socket descriptor.
int	priority (int scheduling)
	Set packet priority, 0 to 6 unless privileged.
size_t	readfrom (void *data, size_t number, struct sockaddr_storage *address=((void *) 0))
	Read data from the socket receive buffer.
size_t	readline (char *data, size_t size)
	Read a newline of text data from the socket and save in NULL terminated string.
size_t	readline (string &buffer)
	Read a string of input from the socket and strip trailing newline.
int	recvsize (unsigned size)
	Set the size of the socket receive buffer.
void	release (void)
	Shutdown and close the socket.
unsigned	segsize (unsigned size)
	Set segment size and get mtu of a socket.
int	sendsize (unsigned size)
	Set the size of the socket send buffer.
int	sendwait (unsigned size)
	Set the size to wait before sending.
bool	setccid (uint8_t ccid)
	Set ccid of dccp socket.
void	shutdown (void)
	Shutdown the socket communication channel.
	Socket ()
	Create a socket object for use.
	Socket (Socket &existing)
	Create socket as duped handle of existing socket.
	Socket (socket_t socket)
	Create socket from existing socket descriptor.
	Socket (struct addrinfo *address)
	Create and connect a socket to an address from an address list.
	Socket (int family, int type, int protocol=0)
	Create an unbound socket of a specific type.
	Socket (char *address, char *port, int family=0, int type=0, int protocol=0)
	Create a bound socket.
int	tos (int type)
	Set the type of service field of outgoing packets.
int	ttl (unsigned char time)
	Set the time to live before packets expire.
int	wait (timeout_t timeout=Timer::inf)
	Socket i/o timer setting.
bool	waitPending (timeout_t timeout=0)
	Test for pending input data.
bool	waitSending (timeout_t timeout=0)
	Test for output data sent.
size_t	writes (char *string)
	Write a null terminated string to the socket.
size_t	writeto (void *data, size_t number, struct sockaddr *address=((void *) 0))
	Write data to the socket send buffer.
virtual	~Socket ()
	Shutdown, close, and destroy socket.

Protected Attributes
size_t	bufsize
Family	family
char *	gbuf
char *	pbuf
timeout_t	timeout
Protected Attributes inherited from ost::Socket
struct {
bool   broadcast: 1
bool   completion: 1
bool   keepalive: 1
bool   linger: 1
bool   loopback: 1
bool   multicast: 1
bool   route: 1
bool   thrown: 1
unsigned   ttl: 8
}	flags
State volatile	state

Friends
TCPStream &	crlf (TCPStream &)
TCPStream &	lfcr (TCPStream &)

Additional Inherited Members
Public Types inherited from ost::Socket
enum	Error {   errSuccess = 0, errCreateFailed, errCopyFailed, errInput,   errInputInterrupt, errResourceFailure, errOutput, errOutputInterrupt,   errNotConnected, errConnectRefused, errConnectRejected, errConnectTimeout,   errConnectFailed, errConnectInvalid, errConnectBusy, errConnectNoRoute,   errBindingFailed, errBroadcastDenied, errRoutingDenied, errKeepaliveDenied,   errServiceDenied, errServiceUnavailable, errMulticastDisabled, errTimeout,   errNoDelay, errExtended, errLookupFail, errSearchErr,   errInvalidValue }
typedef enum Error	Error
enum	Family { IPV6 = 1, IPV4 = 2 }
typedef enum Family	Family
enum	Pending { pendingInput, pendingOutput, pendingError }
typedef enum Pending	Pending
enum	State {   INITIAL, AVAILABLE, BOUND, CONNECTED,   CONNECTING, STREAM }
typedef enum State	State
enum	Tos {   tosLowDelay = 0, tosThroughput, tosReliability, tosMinCost,   tosInvalid }
typedef enum Tos	Tos
Static Public Member Functions inherited from ost::Socket
static bool	check (Family fam)
	See if a specific protocol family is available in the current runtime environment.
Protected Types inherited from ucommon::Socket
typedef void *	set_t
	External definition of fd_set type.
Static Protected Member Functions inherited from ost::Socket
static socket_t	dupSocket (socket_t s, Socket::State state)
Static Protected Attributes inherited from ost::Socket
static Mutex	mutex

Detailed Description

TCP streams are used to represent TCP client connections to a server by TCP protocol servers for accepting client connections.

The TCP stream is a C++ "stream" class, and can accept streaming of data to and from other C++ objects using the << and >> operators.

TCPStream itself can be formed either by connecting to a bound network address of a TCP server, or can be created when "accepting" a network connection from a TCP server.

Author

David Sugar dyfet.nosp@m.@ost.nosp@m.el.co.nosp@m.m streamable TCP socket connection.

Definition at line 315 of file tcp.h.

Constructor & Destructor Documentation

ost::TCPStream::TCPStream	(	TCPSocket &	server,
		bool	throwflag = true,
		timeout_t	timeout = 0
	)

Create a TCP stream by accepting a connection from a bound TCP socket acting as a server.

This performs an "accept" call.

Parameters

server	socket listening
throwflag	flag to throw errors.
timeout	for all operations.

ost::TCPStream::TCPStream	(	IPV4Host &	host,
		tpport_t	port,
		unsigned	mss = 536,
		bool	throwflag = true,
		timeout_t	timeout = 0
	)

Create a TCP stream by connecting to a TCP socket (on a remote machine).

Parameters

host	address of remote TCP server.
port	number to connect.
mss	maximum segment size of streaming buffers.
throwflag	flag to throw errors.
timeout	for all operations.

ost::TCPStream::TCPStream	(	char *	name,
		Family	family = IPV4,
		unsigned	mss = 536,
		bool	throwflag = false,
		timeout_t	timer = 0
	)

Construct a named TCP Socket connected to a remote machine.

Parameters

name	of remote service.
family	of protocol.
mss	maximum segment size of streaming buffers.
throwflag	flag to throw errors.
timer	for timeout for all operations.

Member Function Documentation

void ost::TCPStream::allocate ( size_t  size )

protected

Used to allocate the buffer space needed for iostream operations.

This function is called by the constructor.

Parameters

size	of stream buffers from constructor.

void ost::TCPStream::connect ( IPV4Host &  host, tpport_t  port, unsigned  mss = 536  )

protected

Create a TCP stream by connecting to a TCP socket (on a remote machine).

Parameters

host	address of remote TCP server.
port	number to connect.
mss	maximum segment size of streaming buffers.

void ost::TCPStream::connect ( char *  name, unsigned  mss = 536  )

protected

Connect a TCP stream to a named destination host and port number, using getaddrinfo interface if available.

Parameters

name	of host and service to connect
mss	maximum segment size of stream buffer

void ost::TCPStream::connect

(

TCPSocket &

server

)

Accept a connection from a TCP Server.

Parameters

server

socket listening

void ost::TCPStream::endStream ( void  )

protected

Used to terminate the buffer space and cleanup the socket connection.

This fucntion is called by the destructor.

size_t ost::TCPStream::getBufferSize ( void  )

inline

Return the size of the current stream buffering used.

Returns

size of stream buffers.

Definition at line 532 of file tcp.h.

bool ost::TCPStream::isPending	(	Pending	pend,
		timeout_t	timeout = ucommon::Timer::inf
	)

Get the status of pending stream data.

This can be used to examine if input or output is waiting, or if an error or disconnect has occured on the stream. If a read buffer contains data then input is ready and if write buffer contains data it is first flushed and then checked.

int ost::TCPStream::overflow ( int  ch )

protected

This streambuf method is used to write the output buffer through the established tcp connection.

Parameters

ch	char to push through.

Returns

char pushed through.

ssize_t ost::TCPStream::peek ( void *  buf, size_t  len  )

inline

Examine contents of next waiting packet.

Parameters

buf	pointer to packet buffer for contents.
len	of packet buffer.

Returns

number of bytes examined.

Reimplemented from ucommon::Socket.

Definition at line 524 of file tcp.h.

size_t ost::TCPStream::printf	(	char *	format,
			...
	)

Print content into a socket.

Returns

count of bytes sent.

Parameters

format

string

Reimplemented from ucommon::Socket.

void ost::TCPStream::setTimeout ( timeout_t  timer )

inline

Set the I/O operation timeout for socket I/O operations.

Parameters

timer

to change timeout.

Definition at line 482 of file tcp.h.

int ost::TCPStream::sync

(

void

)

Flushes the stream input and output buffers, writes pending output.

Returns

0 on success.

std::iostream* ost::TCPStream::tcp ( void  )

inlineprotected

Used in derived classes to refer to the current object via it's iostream.

For example, to send a set of characters in a derived method, one might use *tcp() << "test".

Returns

stream pointer of this object.

Definition at line 423 of file tcp.h.

int ost::TCPStream::uflow ( )

protected

This streambuf method is used for doing unbuffered reads through the establish tcp socket connection when in interactive mode.

Also this method will handle proper use of buffers if not in interative mode.

Returns

char from tcp socket connection, EOF if not connected.

int ost::TCPStream::underflow ( )

protected

This streambuf method is used to load the input buffer through the established tcp socket connection.

Returns

char from get buffer, EOF if not connected.

---

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

• commoncpp/tcp.h