Chapter 23. UDP: User Datagram Protocol
23.1. Introduction
The User Datagram Protocol, or UDP, is a simple, datagram-oriented, transport-layer protocol: each output operation by a process produces exactly one UDP datagram, which causes one IP datagram to be sent.
A process accesses UDP by creating a socket of type SOCK_DGRAM in the Internet domain. By default the socket is termed unconnected. Each time the process sends a datagram it must specify the destination IP address and port number. Each time a datagram is received for the socket, the process can receive the source IP address and port number from the datagram.
We mentioned in Section 22.5 that a UDP socket can also be connected to one particular IP address and port number. ...
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