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Technical Reference: Communications, Volume 1
DL_UNITDATA_IND Primitive
Purpose
Conveys one data link service data unit (DLSDU) from
the data link service (DLS) provider to the DLS user.
Structure
The message consists of one M_PROTO message block, which contains the following structure, followed by one
or more M_DATA blocks containing at least one byte of
data:
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;
This structure is defined in /usr/include/sys/dlpi.h.
Description
The DL_UNITDATA_IND primitive
conveys one DLSDU from the DLS provider to the DLS user.
Note
The amount of user data that may be transferred in a single
DLSDU is limited. This limit is conveyed by the dl_max_sdu parameter of the DL_INFO_ACK primitive.
Parameters
dl_primitive |
Specifies the DL_UNITDATA_IND primitive. |
dl_dest_addr_length |
Specifies the length of the data link service access point (DLSAP)
address of the destination DLS user. If the destination user is implemented
using the Data Link Provider Interface (DLPI), the full DLSAP address is returned
on the DL_BIND_ACK primitive. |
dl_dest_addr_offset |
Indicates where the destination DLSAP address begins. The value of
this parameter is the offset from the beginning of the M_PROTO message block. |
dl_src_addr_length |
Specifies the length of the DLSAP address of the source DLS user. |
dl_src_addr_offset |
Indicates where the source DLSAP address begins. The value of this
parameter is the offset from the beginning of the M_PROTO message block. |
dl_group_address |
Indicates the address set by the DLS provider upon receiving and
passing upstream a data message when the destination address of the data message
is a multicast or broadcast address. |
States
Valid |
The primitive is valid in the DL_IDLE state. |
New |
The resulting state is unchanged. |
Related Information
The DL_INFO_ACK primitive, DL_BIND_ACK primitive, DL_UDERROR_IND primitive.
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