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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(3xti) and t_rcvudata(3xti), 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
| Command | Description |
|---|---|
| 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 |