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Technical Reference: Communications, Volume 1
Conveys one data link service data
unit (DLSDU) from the data link service (DLS) provider to the DLS user.
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.
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.
| 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.
|
| Valid
| The primitive is valid in the DL_IDLE state.
|
| New
| The resulting state is unchanged.
|
This primitive is part of Base
Operating System (BOS) Runtime.
The DL_INFO_ACK primitive, DL_BIND_ACK primitive, DL_UDERROR_IND primitive.
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