UDP Socket functions


Defines
#define	MTU 1400
	Constant for the size of ethernet frame.
#define	IP_HEADER (5*4)
	Constant for the size of the IP Header.
#define	UDP_HEADER (2*4)
	Constant for the size of the UDP header.
#define	UDP_PAYLOAD_SIZE (MTU - (IP_HEADER + UDP_HEADER))
	Constant for maximum UDP packet payload size.
#define	UDPSendTo(_socketfd, _data, _data_len, _to, _to_len) sendto(_socketfd, _data, _data_len, 0, _to, _to_len)
	Macro to simplify sending data to a socket.
#define	UDPReceiveFrom(_socketfd, _data, _data_len, _from, _from_len) recvfrom(_socketfd, _data, _data_len, 0, _from, _from_len)
	Macro to simplify receiving data from a socket.
Functions
int	UDPCreateSocket (sa_family_t family)
	Creates a UDP socket for the given family.

Define Documentation

#define MTU 1400

Constant for the size of ethernet frame.

This is a conservative estimate.

#define UDP_PAYLOAD_SIZE (MTU - (IP_HEADER + UDP_HEADER))

Constant for maximum UDP packet payload size.

This is a conservative estimate.

#define UDPReceiveFrom	(	_socketfd,
		_data,
		_data_len,
		_from,
		_from_len	)	recvfrom(_socketfd, _data, _data_len, 0, _from, _from_len)

Macro to simplify receiving data from a socket.

Parameters:

	_socketfd	The socket file descriptor to receive data from.
	_data	The buffer to receive the data in.
	_data_len	The length of the buffer.
	_from	Address buffer to receive the address of the sender.
	_from_len	The length of the _from buffer.

#define UDPSendTo	(	_socketfd,
		_data,
		_data_len,
		_to,
		_to_len	)	sendto(_socketfd, _data, _data_len, 0, _to, _to_len)

Macro to simplify sending data to a socket.

Parameters:

	_socketfd	The socket file descriptor to send the data to.
	_data	Buffer containing the data to send.
	_data_len	Length of the data to send.
	_to	The buffer containing the address to send the data to.
	_to_len	Length of the _to buffer,

int UDPCreateSocket ( sa_family_t family )

Creates a UDP socket for the given family.

The socket family is intended to be either PF_INET or PF_INET6.

Parameters:

family

Either PF_INET or PF_INET6.