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16 Chapter 1
LLA to DLPI Migration
Transmitting Data
Transmitting Data
LLA requires the user to log a destination address (LOG_DEST_ADDR)
and a destination service access point (LOG_DSAP) prior to sending any
data.
DLPI requires the user to specify the destination address and
destination service access point (dsap) as part of the data transfer
request. The combination of destination MAC address and dsap is
referred to as the DLSAP address.
The DLSAP address format is basically the destination MAC address
followed by the LLC protocol value. A complete description of the DLSAP
address format is described in the DLPI Programmer's Guide.
LLA supports the write system call for sending data requests.
DLPI only supports the putmsg system call for sending data over RAW
(see the DLPI Programmer's Guide) and connectionless mode streams.
The write system call is only supported over connection oriented
streams in the DATA_XFER state (i.e. a connection must be established).