DLPI Programmer's Guide

88 Chapter 2
DLPI Primitives
Connectionless-mode Service Primitives
DL_OUTSTATE
Primitive was issued from an invalid state.
DL_UNSUPPORTED
Requested priority not supplied by provider.
DL_UNITDATA_IND
Conveys one DLSDU from the DLS provider to the DLS user.
Format
The message consists of one M_PROTO message block containing the
structure shown below, followed by one or more M_DATA blocks
containing at least one byte of data. The amount of user data that may be
transferred in a single DLSDU is limited. This limit is conveyed by the
parameter dl_max_sdu in the DL_INFO_ACK primitive.
typedef struct {
ulong dl_primitive;
ulong dl_dest_addr_length;
ulong dl_dest_addr_offset;
ulong dl_src_addr_length;
ulong dl_src_addr_offset;
ulong dl_group_address;
} dl_unitdata_ind_t;
Parameters
dl_primitive
DL_UNITDATA_IND
dl_dest_addr_length
length of the address of the DLSAP where this DL_UNITDATA_IND
is intended to be delivered.
dl_dest_addr_offset
offset from the beginning of the M_PROTO message block where the
destination DLSAP address begins.
dl_src_addr_length
length of the DLSAP address of the sending DLS user.
dl_src_addr_offset