XTI(POSIX) basics

X/Open Transport Interface (XTI) is the standard defined by X/Open for a number of programming interfaces which allow the application to access network levels, similarly to the socket interface.

XTI offers two types of services:

• connection-oriented service

• connectionless service

XTI appears to the user as a finite, event-controlled state machine.
This means:

• For a transport endpoint, there is a finite number of defined states.

• Each of these states can only be reached via specific events.

• In each state, only specific functions can be executed.