Network Interface Guide

Connectionless Mode Routines

Connectionless-mode transport service has two phases: local management and data transfer. The local management phase defines the same local operations as for the connection mode service.

The data transfer phase lets a user transfer data units (usually called datagrams) to the specified peer user. Each data unit must be accompanied by the transport address of the destination user. t_sndudata(3NSL) sends and t_rcvvudata(3NSL) receives messages. Table 3-1 summarizes all routines for connectionless mode data transfer.

Table 3-1 Routines for Connectionless-Mode Data Transfer




Sends a message to another user of the transport 


Receives a message sent by another user of the transport 


Retrieves error information associated with a previously sent message