The connectionless-mode transport service is characterized by two phases: local management and data transfer. The local management phase defines the same local operations described previously for the connection-mode service.
The data transfer phase enables a user to transfer data units (sometimes called datagrams) to the specified peer user. Each data unit must be accompanied by the transport address of the destination user. Two routines, t_sndudata(S) and t_rcvudata(S), support this message-based data transfer facility. ``Routines for connectionless-mode data transfer'' summarizes all routines associated with connectionless-mode data transfer.
Routines for connectionless-mode data transfer
|t_rcvudata||Retrieves a message sent by another transport user|
|t_rcvuderr||Retrieves error information associated with a previously sent message|
|t_sndudata||Sends a message to the specified destination user|