NAME

       ost::UDPSocket - UDP sockets implement the TCP SOCK_DGRAM UDP protocol.

SYNOPSIS

       #include <socket.h>

       Inherits ost::Socket.

       Inherited by ost::UDPBroadcast, ost::UDPReceive [protected], and ost::UDPTransmit
       [protected].

   Public Member Functions
       UDPSocket (Family family=IPV4)
           Create an unbound UDP socket, mostly for internal use.
       UDPSocket (const char *name, Family family=IPV4)
           Create a UDP socket bound by a service name.
       UDPSocket (const IPV4Address &bind, tpport_t port)
           Create a UDP socket and bind it to a specific interface and port address so that other
           UDP sockets on remote machines (or the same host) may find and send UDP messages to
           it.
       UDPSocket (const IPV6Address &bind, tpport_t port)
       virtual ~UDPSocket ()
           Destroy a UDP socket as a socket.
       Error setLoopback (bool enable)
           Set the loopback.
       Error setMulticast (bool enable)
           Set the multicast.
       Error setTimeToLive (char ttl)
           Set time to live.
       void setPeer (const IPV4Host &host, tpport_t port)
           set the peer address to send message packets to.
       void connect (const IPV4Host &host, tpport_t port)
       void setPeer (const IPV6Host &host, tpport_t port)
       void connect (const IPV6Host &host, tpport_t port)
       Socket::Error getInterfaceIndex (const char *ethX, int &InterfaceIndex)
           get the interface index for a named network device
       Socket::Error join (const IPV4Multicast &ia, int InterfaceIndex)
           join a multicast group on a particular interface
       ssize_t send (const void *buf, size_t len)
           Send a message packet to a peer host.
       ssize_t receive (void *buf, size_t len, bool reply=false)
           Receive a message from any host.
       IPV4Host getIPV4Peer (tpport_t *port=NULL) const
           Examine address of sender of next waiting packet.
       IPV4Host getPeer (tpport_t *port=NULL) const
       IPV6Host getIPV6Peer (tpport_t *port=NULL) const
       ssize_t peek (void *buf, size_t len)
           Examine contents of next waiting packet.
       void setPeer (const char *service)
           Associate socket with a named connection.
       void connect (const char *service)
       Error disconnect (void)
           Disassociate this socket from any host connection.

   Protected Attributes
       union {
          struct sockaddr_in6 ipv6
          struct sockaddr_in ipv4
       } peer
       Family family

   Additional Inherited Members

Detailed Description

       UDP sockets implement the TCP SOCK_DGRAM UDP protocol.

       They can be used to pass unverified messages between hosts, or to broadcast a specific
       message to an entire subnet. Please note that Streaming of realtime data commonly use
       UDPDuplex related classes rather than UDPSocket.

       In addition to connected TCP sessions, Common C++ supports UDP sockets and these also
       cover a range of functionality. Like a TCPSocket, A UDPSocket can be created bound to a
       specific network interface and/or port address, though this is not required. UDP sockets
       also are usually either connected or otherwise 'associated' with a specific 'peer' UDP
       socket. Since UDP sockets operate through discreet packets, there are no streaming
       operators used with UDP sockets.

       In addition to the UDP 'socket' class, there is a 'UDPBroadcast' class. The UDPBroadcast
       is a socket that is set to send messages to a subnet as a whole rather than to an
       individual peer socket that it may be associated with.

       UDP sockets are often used for building 'realtime' media streaming protocols and full
       duplex messaging services. When used in this manner, typically a pair of UDP sockets are
       used together; one socket is used to send and the other to receive data with an associated
       pair of UDP sockets on a 'peer' host. This concept is represented through the Common C++
       UDPDuplex object, which is a pair of sockets that communicate with another UDPDuplex pair.

       Author
           David Sugar dyfet@ostel.com

       Unreliable Datagram Protocol sockets.

Constructor & Destructor Documentation

   ost::UDPSocket::UDPSocket (Family family = IPV4)
       Create an unbound UDP socket, mostly for internal use.

   ost::UDPSocket::UDPSocket (const char * name, Family family = IPV4)
       Create a UDP socket bound by a service name.

   ost::UDPSocket::UDPSocket (const IPV4Address & bind, tpport_t port)
       Create a UDP socket and bind it to a specific interface and port address so that other UDP
       sockets on remote machines (or the same host) may find and send UDP messages to it. On
       failure to bind, an exception is thrown.

       Parameters
           bind address to bind this socket to.
           port number to bind this socket to.

   ost::UDPSocket::UDPSocket (const IPV6Address & bind, tpport_t port)
   virtual ost::UDPSocket::~UDPSocket () [virtual]
       Destroy a UDP socket as a socket.

Member Function Documentation

   void ost::UDPSocket::connect (const char * service)
   void ost::UDPSocket::connect (const IPV4Host & host, tpport_t port)
   void ost::UDPSocket::connect (const IPV6Host & host, tpport_t port)
   Error ost::UDPSocket::disconnect (void)
       Disassociate this socket from any host connection. No data should be read or written until
       a connection is established.

   Socket::Error ost::UDPSocket::getInterfaceIndex (const char * ethX, int & InterfaceIndex)
       get the interface index for a named network device

       Parameters
           ethX is device name, like 'eth0' or 'eth1'
           InterfaceIndex is the index value returned by os

   IPV4Host ost::UDPSocket::getIPV4Peer (tpport_t * port = NULL) const
       Examine address of sender of next waiting packet. This also sets 'peer' address to the
       sender so that the next 'send' message acts as a 'reply'. This additional behavior
       overides the standard socket getSender behavior.

       Parameters
           port pointer to hold port number.

   IPV6Host ost::UDPSocket::getIPV6Peer (tpport_t * port = NULL) const
   IPV4Host ost::UDPSocket::getPeer (tpport_t * port = NULL) const [inline]
   Socket::Error ost::UDPSocket::join (const IPV4Multicast & ia, int InterfaceIndex)
       join a multicast group on a particular interface

       Parameters
           ia is the multicast address to use
           InterfaceIndex is the index value returned by getInterfaceIndex

   ssize_t ost::UDPSocket::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.

       References _IOLEN64.

   ssize_t ost::UDPSocket::receive (void * buf, size_t len, bool reply = false)
       Receive a message from any host.

       Parameters
           buf pointer to packet buffer to receive.
           len of packet buffer to receive.
           reply save sender address for reply if true.

       Returns
           number of bytes received.

   ssize_t ost::UDPSocket::send (const void * buf, size_t len)
       Send a message packet to a peer host.

       Parameters
           buf pointer to packet buffer to send.
           len of packet buffer to send.

       Returns
           number of bytes sent.

   Error ost::UDPSocket::setLoopback (bool enable) [inline]
       Set the loopback.

       References ost::Socket::setLoopbackByFamily().

   Error ost::UDPSocket::setMulticast (bool enable) [inline]
       Set the multicast.

       References ost::Socket::setMulticastByFamily().

   void ost::UDPSocket::setPeer (const char * service)
       Associate socket with a named connection.

   void ost::UDPSocket::setPeer (const IPV4Host & host, tpport_t port)
       set the peer address to send message packets to. This can be set before every send() call
       if nessisary.

       Parameters
           host address to send packets to.
           port number to deliver packets to.

   void ost::UDPSocket::setPeer (const IPV6Host & host, tpport_t port)
   Error ost::UDPSocket::setTimeToLive (char ttl) [inline]
       Set time to live.

       References ost::Socket::setTimeToLiveByFamily().

Member Data Documentation

   Family ost::UDPSocket::family [protected]
   struct sockaddr_in ost::UDPSocket::ipv4
   struct sockaddr_in6 ost::UDPSocket::ipv6
   union { ... }  ost::UDPSocket::peer [protected]

Author

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