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LLC_CCB Overview  Group

The LLC_CCB structure represents a command control block. You pass a pointer to this structure to the AcsLan function.

typedef struct _LLC_CCB {

    UCHAR uchAdapterNumber; 

    UCHAR uchDlcCommand; 

    UCHAR uchDlcStatus; 

    UCHAR uchReserved1; 

    struct _LLC_CCB *pNext;

    ULONG ulCompletionFlag;

    CCB_PARMS u;

    HANDLE hCompletionEvent;

    UCHAR uchReserved2; 

    UCHAR uchReadFlag; 

    USHORT usReserved3

} LLC_CCB, *PLLC_CCB;

Members

uchAdapterNumber
Specifies adapter number 0 or 1.
uchDlcCommand
Specifies the command code. The following command codes are supported.

Code

Meaning

LLC_BUFFER_CREATE

Creates a new DLC buffer pool and returns its handle. The application must open at least one adapter before it can create the buffer pool.

LLC_BUFFER_FREE

Returns one or more buffers to the adapter pool. The buffers must have been obtained with the LLC_BUFFER_GET command.

LLC_BUFFER_GET

Returns the requested buffers. You can retrieve several buffers of the same size or an optimal set of buffers for the specified frame size.

LLC_DIR_CLOSE_ADAPTER

Closes the adapter logically, releasing its resources and canceling any pending commands. Open SAPs or link stations are reset before the completion of this command. Canceled commands return the error code LLC_STATUS_CANCELLED_BY_SYSTEM_ACTION. Functional address bits are reset.

The pNext member receives the address of a queue of CCBs terminated by this command.

LLC_DIR_CLOSE_DIRECT

Releases ownership of all direct stations. If you use an LLC_READ command to post this command, the system returns the buffers from the direct buffer pool in the parameter table.

LLC_DIR_INITIALIZE

Resets the network adapter, returns any pending commands, and releases buffer resources. For security reasons, the command resets the adapter physically only if it was not functioning normally when you issued the command.

LLC_DIR_INTERRUPT

This command does not do anything under Windows. No parameter table is required.

LLC_DIR_OPEN_ADAPTER

Prepares the protocol drivers for network communication. The adapter must be in a logically closed state for this command to succeed.

LLC_DIR_OPEN_DIRECT

Gives the application ownership of the direct station and enables it to receive frames using the LLC_RECEIVE command.

LLC_DIR_READ_LOG

Reads and resets the adapter logs. The system transfers the log data to the buffer in the parameter table.

LLC_DIR_SET_EXCEPTION_FLAGS

Defines user-notification flags so the system notifies the application of exception conditions.

LLC_DIR_SET_FUNCTIONAL_ADDRESS

Sets or resets the functional addresses for the adapter to receive messages.

LLC_DIR_SET_GROUP_ADDRESS

Sets or resets the group address for which the adapter will receive messages. Only one application can set a group address for a Token-Ring adapter. This command can fail if the Ethernet adapter does not have an available multicast address.

LLC_DIR_SET_MULTICAST_ADDRESS

Sets a 48-bit multicast address for the current DLC adapter context. The application must issue this command before it can receive multicasts. This command is supported only on Ethernet networks and is an alternative to the LLC_DIR_SET_GROUP_ADDRESS command. This command can fail if the Ethernet adapter does not have an available multicast address. A value of zero removes the previous multicast address.

LLC_DIR_STATUS

Reads the general status information. You can issue this command before the LLC_DIR_OPEN_ADAPTER command, but after the LLC_DIR_INITIALIZE command.

LLC_DIR_TIMER_CANCEL

Cancels a timer that was previously initiated by an LLC_DIR_TIMER_SET command.

LLC_DIR_TIMER_CANCEL_GROUP

Cancels a group of timer commands that were previously initiated by the LLC_DIR_TIMER_SET command.

LLC_DIR_TIMER_SET

Initiates a programmable timer to expire after a designated interval.

LLC_DLC_CLOSE_SAP

Closes a SAP. The SAP cannot close unless all link stations are closed.

LLC_DLC_CLOSE_STATION

Closes a link station.

LLC_DLC_CONNECT_STATION

Starts or completes a connection between the local and remote link stations. Both the local station and the remote station must issue the command to establish the connection.

LLC_DLC_FLOW_CONTROL

Controls the flow of data across a single link station on a SAP or across every link station on a SAP. You should issue this command immediately after a link station enters a local busy state. The driver clears the busy state when there are enough free buffers to receive more frames.

LLC_DLC_MODIFY

Modifies the work values of an open link station or the default values of a SAP.

LLC_DLC_OPEN_SAP

Activates a SAP and reserves a number of link stations for the SAP.

LLC_DLC_OPEN_STATION

Allocates resources for a link station.

LLC_DLC_REALLOCATE_STATIONS

Reallocates the number of link stations allocated to a SAP. When reducing the number of stations, the command returns the deallocated stations to the adapter pool. When increasing the number of stations, the command assigns new stations from the adapter pool.

LLC_DLC_RESET

Resets the SAPs and their associated link stations. Affected resources are freed, and pending commands are terminated.

LLC_DLC_SET_THRESHOLD

Sets a threshold for the SAP or direct stationís buffer pool. The application is notified whenever the number of buffers in the pool falls below this threshold.

LLC_DLC_STATISTICS

Reads and optionally resets the DLC log. The log is transferred to the buffer indicated by the parameter table.

LLC_READ

Performs a read operation. The operation is complete when the system sets the uchDlcStatus member and the sets the hCompletionEvent event to the signaled state. The data and optional header begin at offset 64.

LLC_READ_CANCEL

Cancels a pending LLC_READ command for the application.

LLC_RECEIVE

Receives data. The command fails if the application has not created a buffer pool.

LLC_RECEIVE_CANCEL

Cancels a pending LLC_RECEIVE command.

LLC_RECEIVE_MODIFY

Receives data and puts some of it into a user buffer.

LLC_TRANSMIT_DIR_FRAME

Transmits data to the direct station.

LLC_TRANSMIT_I_FRAME

Transmits information data to a link station.

LLC_TRANSMIT_TEST_CMD

Requests the adapter to transmit a test command frame with the poll bit set. You can only use this command with a SAP.

LLC_TRANSMIT_UI_FRAME

Transmits unnumbered information data for a SAP. You can use this command only with a SAP.

LLC_TRANSMIT_XID_CMD

Transmits an XID command with the poll bit set on. You can use this command only with a SAP.

LLC_TRANSMIT_XID_RESP_FINAL

Transmits an XID response with the final bit on. You can only use this command with a SAP opened with SAP options specifying that the application will handle XID commands.

LLC_TRANSMIT_XID_RESP_NOT_FINAL

Transmits an XID response with the final bit off. You can only use this command with a SAP opened with SAP options specifying that the application will handle XID commands.

uchDlcStatus
Receives the command completion code. This value is set to LLC_STATUS_PENDING when the command is received. It is set to an appropriate code when the command is completed. For a list of the command completion codes, see the following Remarks section.
uchReserved1
Reserved.
pNext
Specifies the next command control block in the chain. Otherwise, set this parameter to NULL.
ulCompletionFlag
An optional flag set when an LLC_READ command is completed. If you set this parameter to zero before the command is issued, it is not used.
u
Specifies the address of a CCB_PARMS structure representing the parameter table.
hCompletionEvent
Specifies a handle to an event that you can use to check for command completion. Otherwise, set this parameter to zero. When the command is completed, it sets the event to the signaled state.
uchReserved2
Windows NT: Not used.

Windows 95: The identifier of the application issuing the command. This value is returned by the LLC_DIR_OPEN_ADAPTER command and is used for all subsequent commands.

uchReadFlag
Specifies that an LLC_READ command control block is chained in this command. Otherwise, set this parameter to zero.
usReserved3
Reserved.

Remarks

The uchDlcStatus member receives an LLC_STATUS value representing the command completion code. LLC_STATUS is an enumerated type. The following completion codes are defined:

Code

Name

1

LLC_STATUS_INVALID_COMMAND

2

LLC_STATUS_DUPLICATE_COMMAND

3

LLC_STATUS_ADAPTER_OPEN

4

LLC_STATUS_ADAPTER_CLOSED

5

LLC_STATUS_PARAMETER_MISSING

6

LLC_STATUS_INVALID_OPTION

7

LLC_STATUS_COMMAND_CANCELLED_FAILURE

10

LLC_STATUS_CANCELLED_BY_USER

12

LLC_STATUS_SUCCESS_NOT_OPEN

17

LLC_STATUS_TIMER_ERROR

18

LLC_STATUS_NO_MEMORY

21

LLC_STATUS_LOST_LOG_DATA

22

LLC_STATUS_BUFFER_SIZE_EXCEEDED

24

LLC_STATUS_INVALID_BUFFER_LENGTH

25

LLC_STATUS_INADEQUATE_BUFFERS

26

LLC_STATUS_USER_LENGTH_TOO_LARGE

27

LLC_STATUS_INVALID_PARAMETER_TABLE

28

LLC_STATUS_INVALID_POINTER_IN_CCB

29

LLC_STATUS_INVALID_ADAPTER

32

LLC_STATUS_LOST_DATA_NO_BUFFERS

33

LLC_STATUS_LOST_DATA_INADEQUATE_SPACE

34

LLC_STATUS_TRANSMIT_ERROR_FS

35

LLC_STATUS_TRANSMIT_ERROR

39

LLC_STATUS_LINK_NOT_TRANSMITTING

40

LLC_STATUS_INVALID_FRAME_LENGTH

50

LLC_STATUS_INVALID_NODE_ADDRESS

51

LLC_STATUS_INVALID_RCV_BUFFER_LENGTH

52

LLC_STATUS_INVALID_XMIT_BUFFER_LENGTH

64

LLC_STATUS_INVALID_STATION_ID

65

LLC_STATUS_LINK_PROTOCOL_ERROR

66

LLC_STATUS_PARMETERS_EXCEEDED_MAX

67

LLC_STATUS_INVALID_SAP_VALUE

68

LLC_STATUS_INVALID_ROUTING_INFO

71

LLC_STATUS_LINK_STATIONS_OPEN

74

LLC_STATUS_INCOMPATIBLE_COMMANDS

77

LLC_STATUS_CONNECT_FAILED

79

LLC_STATUS_INVALID_REMOTE_ADDRESS

80

LLC_STATUS_CCB_POINTER_FIELD

87

LLC_STATUS_INADEQUATE_LINKS

88

LLC_STATUS_INVALID_PARAMETER_1

92

LLC_STATUS_DIRECT_STATIONS_NOT_ASSIGNED

93

LLC_STATUS_DEVICE_DRIVER_NOT_INSTALLED

94

LLC_STATUS_ADAPTER_NOT_INSTALLED

95

LLC_STATUS_CHAINED_DIFFERENT_ADAPTERS

96

LLC_STATUS_INIT_COMMAND_STARTED

98

LLC_STATUS_CANCELLED_BY_SYSTEM_ACTION

101

LLC_STATUS_NO_GDT_SELECTORS

105

LLC_STATUS_MEMORY_LOCK_FAILED

128

LLC_STATUS_INVALID_BUFFER_ADDRESS

129

LLC_STATUS_BUFFER_ALREADY_RELEASED

161

LLC_STATUS_INVALID_VERSION

162

LLC_STATUS_NT_ERROR_STATUS

255

LLC_STATUS_PENDING

See Also

AcsLan, CCB_PARMS

See also:


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