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
Command |
Description |
---|---|
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 |