File	Doc	Category	Size	Date	Package
DatagramSocketImpl.java	API Doc	Java SE 6 API	7981	Tue Jun 10 00:25:40 BST 2008	java.net

DatagramSocketImpl

• java.lang.Object

Fields Summary
protected int	localPort The local port number.
protected FileDescriptor	fd The file descriptor object.

Constructors Summary

Methods Summary
protected abstract void	bind(int lport, java.net.InetAddress laddr) Binds a datagram socket to a local port and address. param lport the local port param laddr the local address exception SocketException if there is an error in the underlying protocol, such as a TCP error.
protected abstract void	close() Close the socket.
protected void	connect(java.net.InetAddress address, int port) Connects a datagram socket to a remote destination. This associates the remote address with the local socket so that datagrams may only be sent to this destination and received from this destination. This may be overridden to call a native system connect. If the remote destination to which the socket is connected does not exist, or is otherwise unreachable, and if an ICMP destination unreachable packet has been received for that address, then a subsequent call to send or receive may throw a PortUnreachableException. Note, there is no guarantee that the exception will be thrown. param address the remote InetAddress to connect to param port the remote port number exception SocketException may be thrown if the socket cannot be connected to the remote destination since 1.4
protected abstract void	create() Creates a datagram socket. exception SocketException if there is an error in the underlying protocol, such as a TCP error.
protected void	disconnect() Disconnects a datagram socket from its remote destination. since 1.4
protected java.io.FileDescriptor	getFileDescriptor() Gets the datagram socket file descriptor. return a FileDescriptor object representing the datagram socket file descriptor return fd;
protected int	getLocalPort() Gets the local port. return an int representing the local port value return localPort;
protected abstract byte	getTTL() Retrieve the TTL (time-to-live) option. exception IOException if an I/O exception occurs while retrieving the time-to-live option deprecated use getTimeToLive instead. return a byte representing the TTL value see #setTTL(byte)
protected abstract int	getTimeToLive() Retrieve the TTL (time-to-live) option. exception IOException if an I/O exception occurs while retrieving the time-to-live option return an int representing the time-to-live value see #setTimeToLive(int)
protected abstract void	join(java.net.InetAddress inetaddr) Join the multicast group. param inetaddr multicast address to join. exception IOException if an I/O exception occurs while joining the multicast group.
protected abstract void	joinGroup(java.net.SocketAddress mcastaddr, java.net.NetworkInterface netIf) Join the multicast group. param mcastaddr address to join. param netIf specifies the local interface to receive multicast datagram packets throws IOException if an I/O exception occurs while joining the multicast group since 1.4
protected abstract void	leave(java.net.InetAddress inetaddr) Leave the multicast group. param inetaddr multicast address to leave. exception IOException if an I/O exception occurs while leaving the multicast group.
protected abstract void	leaveGroup(java.net.SocketAddress mcastaddr, java.net.NetworkInterface netIf) Leave the multicast group. param mcastaddr address to leave. param netIf specified the local interface to leave the group at throws IOException if an I/O exception occurs while leaving the multicast group since 1.4
protected abstract int	peek(java.net.InetAddress i) Peek at the packet to see who it is from. Updates the specified InetAddress to the address which the packet came from. param i an InetAddress object return the port number which the packet came from. exception IOException if an I/O exception occurs exception PortUnreachableException may be thrown if the socket is connected to a currently unreachable destination. Note, there is no guarantee that the exception will be thrown.
protected abstract int	peekData(java.net.DatagramPacket p) Peek at the packet to see who it is from. The data is copied into the specified DatagramPacket. The data is returned, but not consumed, so that a subsequent peekData/receive operation will see the same data. param p the Packet Received. return the port number which the packet came from. exception IOException if an I/O exception occurs exception PortUnreachableException may be thrown if the socket is connected to a currently unreachable destination. Note, there is no guarantee that the exception will be thrown. since 1.4
protected abstract void	receive(java.net.DatagramPacket p) Receive the datagram packet. param p the Packet Received. exception IOException if an I/O exception occurs while receiving the datagram packet. exception PortUnreachableException may be thrown if the socket is connected to a currently unreachable destination. Note, there is no guarantee that the exception will be thrown.
protected abstract void	send(java.net.DatagramPacket p) Sends a datagram packet. The packet contains the data and the destination address to send the packet to. param p the packet to be sent. exception IOException if an I/O exception occurs while sending the datagram packet. exception PortUnreachableException may be thrown if the socket is connected to a currently unreachable destination. Note, there is no guarantee that the exception will be thrown.
protected abstract void	setTTL(byte ttl) Set the TTL (time-to-live) option. param ttl a byte specifying the TTL value deprecated use setTimeToLive instead. exception IOException if an I/O exception occurs while setting the time-to-live option. see #getTTL()
protected abstract void	setTimeToLive(int ttl) Set the TTL (time-to-live) option. param ttl an int specifying the time-to-live value exception IOException if an I/O exception occurs while setting the time-to-live option. see #getTimeToLive()