JNET::JUDPSocket Class Reference

UDP socket. More...

#include <JUDPSocket.hh>

Inheritance diagram for JNET::JUDPSocket:

Public Member Functions
	JUDPSocket ()
	Default constructor.
	JUDPSocket (const JHostname &hostname)
	Constructor.
	JUDPSocket (const int port)
	Constructor.
int	read (char *buffer, const int length) override
	Read data from socket.
int	read (char *buffer, const int length, JUDPSocket &udp)
	Read data from socket.
virtual int	write (const char *buffer, const int length) override
	Write data to socket.
virtual int	read (char *buffer, const int length) override
	Read data from socket.
int	shutdown ()
	Shut down socket.
void	setKeepAlive (const bool on)
	Set keep alive of socket.
bool	getKeepAlive () const
	Get keep alive of socket.
void	setReuseAddress (const bool on)
	Set reuse address.
bool	getReuseAddress () const
	Get reuse address.
void	setReceiveBufferSize (const int size)
	Set receive buffer size.
int	getReceiveBufferSize () const
	Set receive buffer size.
void	setSendBufferSize (const int size)
	Set send buffer size.
int	getSendBufferSize () const
	Get send buffer size.
int	close ()
	Close file.
bool	in_avail (JTimeval timeout=JTimeval::min()) const
	Check availability of input.
bool	out_avail (JTimeval timeout=JTimeval::min()) const
	Check availability of output.
virtual bool	good () const
	Check status.
virtual bool	fail () const
	Check status.
virtual bool	bad () const
	Check status.
virtual bool	eof () const
	Check end of file.
bool	less (const JAbstractFile &file) const
	Less than operation.
int	getFileDescriptor () const
	Get file descriptor.
void	setFileDescriptor (const int file)
	Set file descriptor.
bool	is_open () const
	Get open status.
const sockaddr *	getSockaddr () const
	Get sockaddr.
sockaddr *	getSockaddr ()
	Get sockaddr.
int	getFamily () const
	Get family.
void	setFamily (const int family)
	Set family.
std::string	getHostname () const
	Get host name.
int	getIPnumber () const
	Get IP number.
void	setIPnumber (const int ip_number)
	Set IP number.
void	setIPnumber ()
	Set any IP number.
int	getPort () const
	Get port number.
void	setPort (const int port)
	Set port number.

Static Public Member Functions
static const int	getDefaultBufferSize ()
	Default socket buffer size to be used on this system.
static int	sizeOf ()
	Get size of object.

Static Public Attributes
static const int	FILE_CLOSED = -1

Protected Member Functions
template<class T >
void	setOption (const int level, const int option, const T value)
	Set socket option.
template<class T >
T	getOption (const int level, const int option) const
	Get socket option.

Protected Attributes
int	fileDescriptor

Private Attributes
int	result

Detailed Description

UDP socket.

Definition at line 25 of file JUDPSocket.hh.

Constructor & Destructor Documentation

JUDPSocket() [1/3]

JNET::JUDPSocket::JUDPSocket ( )

inline

Default constructor.

Definition at line 35 of file JUDPSocket.hh.

                 :
      JSocket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)
    {}

JUDPSocket() [2/3]

JNET::JUDPSocket::JUDPSocket ( const JHostname & hostname )

inline

Constructor.

UDP socket for client.

Parameters

hostname

host name of destination

Definition at line 46 of file JUDPSocket.hh.

                                         :
      JSocket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)
    {
      this->setReuseAddress(true);
      this->setIPnumber(JSYSTEM::getIPnumber(hostname.hostname));
      this->setPort(hostname.port);
    }

JUDPSocket() [3/3]

JNET::JUDPSocket::JUDPSocket ( const int port )

inline

Constructor.

UDP socket for server.

Parameters

port	port number of receiver

Definition at line 61 of file JUDPSocket.hh.

                              :
      JSocket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)
    {
      this->setReuseAddress(true);
      this->setIPnumber();
      this->setPort(port);
 
      if (::bind(getFileDescriptor(), getSockaddr(), sizeof(sockaddr)) < 0) {
        THROW(JSocketException, "Bind socket failed at port " << port);
      }
    }

Member Function Documentation

read() [1/3]

int JNET::JUDPSocket::read ( char * buffer, const int length )

inlineoverridevirtual

Read data from socket.

Parameters

buffer	buffer
length	number of bytes to read

Returns

number of bytes actually read

Reimplemented from JNET::JSocket.

Definition at line 81 of file JUDPSocket.hh.

    {
      // read also zero-length datagram, as opposed to method read.
 
      return ::recv(this->getFileDescriptor(),
                    buffer,
                    length,
                    0);
    }

read() [2/3]

int JNET::JUDPSocket::read ( char * buffer, const int length, JUDPSocket & udp )

inline

Read data from socket.

Parameters

buffer	buffer
length	number of bytes to read
udp	UDP socket

Returns

number of bytes actually read

Definition at line 100 of file JUDPSocket.hh.

    {
      socklen_t size = sizeof(sockaddr);
 
      udp.setFileDescriptor(this->getFileDescriptor());
 
      return ::recvfrom(this->getFileDescriptor(),
                        buffer,
                        length,
                        0,
                        udp.getSockaddr(),
                        &size);
    }

write()

virtual int JNET::JUDPSocket::write ( const char * buffer, const int length )

inlineoverridevirtual

Write data to socket.

Parameters

buffer	buffer
length	number of bytes to write

Returns

number of bytes actually written

Reimplemented from JNET::JSocket.

Definition at line 122 of file JUDPSocket.hh.

    {
      return ::sendto(this->getFileDescriptor(),
                      buffer,
                      length,
                      0,
                      this->getSockaddr(),
                      sizeof(sockaddr));
    }

read() [3/3]

virtual int JNET::JSocket::read ( char * buffer, const int length )

inlineoverridevirtual

Read data from socket.

This method handles I/O errors in such a way that:

1. the return value is set to zero if no data are read;
2. an exception is thrown in case of a fatal error;

Parameters

buffer	buffer
length	number of bytes to read

Returns

number of bytes actually read

Reimplemented from JNET::JSocket.

Definition at line 198 of file JSocket.hh.

    {
      int pos = JFile::read(buffer, length);
 
      if        (pos == 0) {
        
        THROW(JSocketException, "Socket read failed " << getFileDescriptor() << ' ' << errno);
        
      } else if (pos <  0) {
        
        switch (errno) {
          
        case EINTR:
        case EWOULDBLOCK:
          //case EAGAIN:
          break;
          
        default:
          THROW(JSocketException, "Socket read error " << getFileDescriptor() << ' ' << errno);
        }
 
        pos = 0;
      }
 
      return pos;
    }

getDefaultBufferSize()

static const int JNET::JSocket::getDefaultBufferSize ( )

inlinestaticinherited

Default socket buffer size to be used on this system.

Returns

number of bytes

Definition at line 75 of file JSocket.hh.

    {
#if __APPLE__
      return JMATH::MEGABYTE;
#else
      return JMATH::GIGABYTE;
#endif
    }

shutdown()

int JNET::JSocket::shutdown ( )

inlineinherited

Shut down socket.

Returns

return value

Definition at line 89 of file JSocket.hh.

    {
      const int value = ::shutdown(getFileDescriptor(), SHUT_RDWR);
 
      close();
 
      return value;
    }

setKeepAlive()

void JNET::JSocket::setKeepAlive ( const bool on )

inlineinherited

Set keep alive of socket.

Parameters

on	true to enable keep alive; false to disable

Definition at line 104 of file JSocket.hh.

    {
      setOption(SOL_SOCKET, SO_KEEPALIVE, int(on ? 1 : 0));
    }

getKeepAlive()

bool JNET::JSocket::getKeepAlive ( ) const

inlineinherited

Get keep alive of socket.

Returns

true if keep alive; else false

Definition at line 115 of file JSocket.hh.

    {
      return (getOption<int>(SOL_SOCKET, SO_KEEPALIVE) == 1);
    }

setReuseAddress()

void JNET::JSocket::setReuseAddress ( const bool on )

inlineinherited

Set reuse address.

Parameters

on	true to enable reuse address; false to disable

Definition at line 126 of file JSocket.hh.

    {
      setOption(SOL_SOCKET, SO_REUSEADDR, int(on ? 1 : 0));
    }

getReuseAddress()

bool JNET::JSocket::getReuseAddress ( ) const

inlineinherited

Get reuse address.

Returns

true if enable reuse address; else false

Definition at line 137 of file JSocket.hh.

    {
      return (getOption<int>(SOL_SOCKET, SO_REUSEADDR) == 1);
    }

setReceiveBufferSize()

void JNET::JSocket::setReceiveBufferSize ( const int size )

inlineinherited

Set receive buffer size.

Parameters

size	number of bytes

Definition at line 148 of file JSocket.hh.

    {
      setOption(SOL_SOCKET, SO_RCVBUF, int(size));
    }

getReceiveBufferSize()

int JNET::JSocket::getReceiveBufferSize ( ) const

inlineinherited

Set receive buffer size.

Returns

number of bytes

Definition at line 159 of file JSocket.hh.

    {
      return getOption<int>(SOL_SOCKET, SO_RCVBUF);
    }

setSendBufferSize()

void JNET::JSocket::setSendBufferSize ( const int size )

inlineinherited

Set send buffer size.

Parameters

size	number of bytes

Definition at line 170 of file JSocket.hh.

    {
      setOption(SOL_SOCKET, SO_SNDBUF, int(size));
    }

getSendBufferSize()

int JNET::JSocket::getSendBufferSize ( ) const

inlineinherited

Get send buffer size.

Returns

number of bytes

Definition at line 181 of file JSocket.hh.

    {
      return getOption<int>(SOL_SOCKET, SO_SNDBUF);
    }

setOption()

template<class T >

void JNET::JSocket::setOption ( const int level, const int option, const T value )

inlineprotectedinherited

Set socket option.

Parameters

level	level
option	option
value	value

Definition at line 274 of file JSocket.hh.

    {
      socklen_t size = sizeof(T);
 
      if (setsockopt(getFileDescriptor(), level, option, &value, size) < 0) {
        THROW(JSocketException, "Set socket option failed " << errno);
      }
    }

getOption()

template<class T >

T JNET::JSocket::getOption ( const int level, const int option ) const

inlineprotectedinherited

Get socket option.

Parameters

level	level
option	option

Returns

value

Definition at line 292 of file JSocket.hh.

    {
      T         value;
      socklen_t size  = sizeof(T);
 
      if (getsockopt(getFileDescriptor(), level, option, &value, &size) < 0) {
        THROW(JSocketException, "Get socket option failed " << errno);
      }
 
      return value;
    }

close()

int JLANG::JFile::close ( )

inlineinherited

Close file.

Returns

return value

Definition at line 57 of file JFile.hh.

    {
      int value = -1;
 
      if (fileDescriptor != FILE_CLOSED) {
 
        value = ::close(fileDescriptor);
 
        fileDescriptor = FILE_CLOSED;
        result         = 0;
      }
 
      return value;
    }

in_avail()

bool JLANG::JFile::in_avail ( JTimeval timeout = JTimeval::min() ) const

inlineinherited

Check availability of input.

This method returns true if at least one byte can be read without blocking.

Parameters

timeout

timeout

Returns

true if ready to read; else false

Definition at line 106 of file JFile.hh.

    {
      return JFileDescriptorMask(*this).in_avail(timeout);
    }

out_avail()

bool JLANG::JFile::out_avail ( JTimeval timeout = JTimeval::min() ) const

inlineinherited

Check availability of output.

This method returns true if at least one byte can be written without blocking.

Parameters

timeout

timeout

Returns

true if ready to write; else false

Definition at line 119 of file JFile.hh.

    {
      return JFileDescriptorMask(*this).out_avail(timeout);
    }

good()

virtual bool JLANG::JFile::good ( ) const

inlinevirtualinherited

Check status.

Returns

true if last I/O operation successful; else false

Definition at line 130 of file JFile.hh.

    {
      return is_open() && !eof() && !bad();
    }

fail()

virtual bool JLANG::JFile::fail ( ) const

inlinevirtualinherited

Check status.

Returns

true if last I/O operation caused logical error; else false

Definition at line 141 of file JFile.hh.

    {
      return result == 0;
    }

bad()

virtual bool JLANG::JFile::bad ( ) const

inlinevirtualinherited

Check status.

Returns

true if last I/O operation caused read/write error; else false

Definition at line 152 of file JFile.hh.

    {
      return fail();
    }

eof()

virtual bool JLANG::JFile::eof ( ) const

inlinevirtualinherited

Check end of file.

Returns

true if end of file; else false

Definition at line 163 of file JFile.hh.

    {
      return result == EOF;
    }

less()

bool JLANG::JAbstractFile::less ( const JAbstractFile & file ) const

inlineinherited

Less than operation.

Parameters

file	JAbstractFile to be compared

Returns

true if this file descriptor is less; else false

Definition at line 64 of file JAbstractFile.hh.

    {
      return getFileDescriptor() < file.getFileDescriptor();
    }

getFileDescriptor()

int JLANG::JAbstractFile::getFileDescriptor ( ) const

inlineinherited

Get file descriptor.

Returns

file descriptor

Definition at line 75 of file JAbstractFile.hh.

    {
      return fileDescriptor;
    }

setFileDescriptor()

void JLANG::JAbstractFile::setFileDescriptor ( const int file )

inlineinherited

Set file descriptor.

Parameters

file	file descriptor

Definition at line 86 of file JAbstractFile.hh.

    {
      fileDescriptor = file;
    }

is_open()

bool JLANG::JAbstractFile::is_open ( ) const

inlineinherited

Get open status.

Definition at line 95 of file JAbstractFile.hh.

    {
      return fileDescriptor != FILE_CLOSED;
    }

getSockaddr() [1/2]

const sockaddr * JNET::JSocketAddress::getSockaddr ( ) const

inlineinherited

Get sockaddr.

Returns

pointer to sockaddr structure

Definition at line 44 of file JSocketAddress.hh.

    {
      return (const sockaddr*) static_cast<const sockaddr_in*>(this);
    }

getSockaddr() [2/2]

sockaddr * JNET::JSocketAddress::getSockaddr ( )

inlineinherited

Get sockaddr.

Returns

pointer to sockaddr structure

Definition at line 55 of file JSocketAddress.hh.

    {
      return (sockaddr*) static_cast<sockaddr_in*>(this);
    }

getFamily()

int JNET::JSocketAddress::getFamily ( ) const

inlineinherited

Get family.

Returns

family

Definition at line 66 of file JSocketAddress.hh.

    {
      return sin_family;
    }

setFamily()

void JNET::JSocketAddress::setFamily ( const int family )

inlineinherited

Set family.

Parameters

family

family

Definition at line 77 of file JSocketAddress.hh.

    {
      sin_family = family;
    }

getHostname()

std::string JNET::JSocketAddress::getHostname ( ) const

inlineinherited

Get host name.

Returns

host name

Definition at line 88 of file JSocketAddress.hh.

    {
      return JSYSTEM::getHostname(this->getIPnumber());
    }

getIPnumber()

int JNET::JSocketAddress::getIPnumber ( ) const

inlineinherited

Get IP number.

Returns

IP number

Definition at line 99 of file JSocketAddress.hh.

    {
      return sin_addr.s_addr;
    }

setIPnumber() [1/2]

void JNET::JSocketAddress::setIPnumber ( const int ip_number )

inlineinherited

Set IP number.

Parameters

ip_number

IP number

Definition at line 110 of file JSocketAddress.hh.

    {
      sin_addr.s_addr = ip_number;
    }

setIPnumber() [2/2]

void JNET::JSocketAddress::setIPnumber ( )

inlineinherited

Set any IP number.

Definition at line 119 of file JSocketAddress.hh.

    {
      sin_addr.s_addr = htonl(INADDR_ANY);
    }

getPort()

int JNET::JSocketAddress::getPort ( ) const

inlineinherited

Get port number.

Returns

port number

Definition at line 130 of file JSocketAddress.hh.

    {
      return ntohs(this->sin_port);
    }

setPort()

void JNET::JSocketAddress::setPort ( const int port )

inlineinherited

Set port number.

Parameters

port	port number

Definition at line 141 of file JSocketAddress.hh.

    {
      if (port >= 0 && port <= std::numeric_limits<u_short>::max())
        sin_port = htons((u_short) port);
      else
        THROW(JCastException, "JSocketAddress::setPort() illegal value.");
    }

sizeOf()

static int JNET::JSocketAddress::sizeOf ( )

inlinestaticinherited

Get size of object.

Returns

number of bytes

Definition at line 155 of file JSocketAddress.hh.

    {
      return sizeof(sockaddr_in);
    }

Member Data Documentation

result

int JLANG::JFile::result

privateinherited

Definition at line 170 of file JFile.hh.

FILE_CLOSED

const int JLANG::JAbstractFile::FILE_CLOSED = -1

staticinherited

Definition at line 27 of file JAbstractFile.hh.

fileDescriptor

int JLANG::JAbstractFile::fileDescriptor

protectedinherited

Definition at line 102 of file JAbstractFile.hh.

---

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

• JUDPSocket.hh