Requests that the data link service (DLS) provider establish a data link connection with a remote DLS user.
The primitive consists of one M_PROTO message block, which contains the following structure:
typedef struct
{
ulong dl_primitive;
ulong dl_dest_addr_length;
ulong dl_dest_addr_offset;
ulong dl_qos_length;
ulong dl_qos_offset;
ulong dl_growth;
} dl_connect_req_t;
The DL_CONNECT_REQ primitive requests that the DLS provider establish a data link connection with a remote DLS user. The request contains the data link service access point (DLSAP) address of the remote DLS user.
| Item | Description |
|---|---|
| dl_primitive | Specifies the DL_CONNECT_REQ primitive. |
| dl_dest_addr_length | Specifies the length of the DLSAP address that identifies the DLS user with whom a connection is to be established. If the called user is implemented using DLPI, this address is the full DLSAP address returned on the DL_BIND_ACK primitive. |
| dl_dest_addr_offset | Specifies where the destination DLSAP address begins. The value of this parameter is the offset from the beginning of the M_PROTO message block. |
| dl_qos_length | The DLS provider does not support any QOS parameter values. This value is set to 0. |
| dl_qos_offset | The DLS provider does not support any QOS parameter values. This value is set to 0. |
| dl_growth | Defines a growth field for future enhancements to this primitive. Its value must be set to 0. |
| Item | Description |
|---|---|
| Valid | The primitive is valid in the DL_IDLE state. |
| New | The resulting state is DL_OUTCON_PENDING. |
There is no immediate response to the connect request. However, if the connect request is accepted by the called DLS user, the DL_CONNECT_CON primitive is sent to the calling DLS user, resulting in the DL_DATAXFER state.
If the connect request is rejected by the called DLS user, the called DLS user cannot be reached, or the DLS provider or called DLS user do not agree on the specified quality of service, a DL_DISCONNECT_IND primitive is sent to the calling DLS user, resulting in the DL_IDLE state.
If the request is erroneous, the DL_ERROR_ACK primitive is returned and the resulting state is unchanged.
| Item | Description |
|---|---|
| DL_ACCESS | Indicates the DLS user does not have proper permission to use the requested DLSAP address. |
| DL_BADADDR | Indicates the DLSAP address information is invalid or is in an incorrect format. |
| DL_BADQOSPARAM | Indicates the QOS parameters contain invalid values. |
| DL_BADQOSTYPE | Indicates the QOS structure type is not supported by the DLS provider. |
| DL_OUTSTATE | Indicates the primitive was issued from an invalid state. |
| DL_SYSERR | Indicates a system error occurred. The system error is indicated in the DL_ERROR_ACK primitive. |
| DL_UNSUPPORTED | Indicates the DLS user has indicated QOS parameters, which are unsupported. |