SLI_BIND_ROUTINE
The SLI_BIND_ROUTINE verb notifies the Microsoft® Windows® logical unit application (LUA) application that a BIND request has come from the host and allows the user-supplied routine to examine the request and formulate a response.
The following structure describes the LUA_COMMON member of the verb control block (VCB) used by SLI_BIND_ROUTINE.
Syntax
struct LUA_COMMON {
unsigned short lua_verb;
unsigned short lua_verb_length;
unsigned short lua_prim_rc;
unsigned long lua_sec_rc;
unsigned short lua_opcode;
unsigned long lua_correlator;
unsigned char lua_luname[8];
unsigned short lua_extension_list_offset;
unsigned short lua_cobol_offset;
unsigned long lua_sid;
unsigned short lua_max_length;
unsigned short lua_data_length;
char FAR * lua_data_ptr;
unsigned long lua_post_handle;
struct LUA_TH lua_th;
struct LUA_RH lua_rh;
struct LUA_FLAG1 lua_flag1;
unsigned char lua_message_type;
struct LUA_FLAG2 lua_flag2;
unsigned char lua_resv56[7];
unsigned char lua_encr_decr_option;
};
Members
lua_verb
Supplied parameter. Contains the verb code, LUA_VERB_SLI for Session Level Interface (SLI) verbs.
lua_verb_length
Supplied parameter. Specifies the length in bytes of the LUA VCB. It must contain the length of the verb record being issued.
lua_prim_rc
Primary return code set by LUA at the completion of the verb. The valid return codes vary depending on the LUA verb issued.
lua_sec_rc
Secondary return code set by LUA at the completion of the verb. The valid return codes vary depending on the LUA verb issued.
lua_opcode
Supplied parameter. Contains the LUA command code (verb operation code) for the verb to be issued, LUA_OPCODE_SLI_BIND_ROUTINE.
lua_correlator
Supplied parameter. Contains a user-supplied value that links the verb with other user-supplied information. LUA does not use or change this information. This parameter is optional.
lua_luname
Supplied parameter. Specifies the ASCII name of the local LU used by the Windows LUA session.
SLI_BIND_ROUTINE only requires this parameter if lua_sid is zero.
This parameter is eight bytes long, padded on the right with spaces (0x20) if the name is shorter than eight characters.
lua_extension_list_offset
Not used by SLI_BIND_ROUTINE and should be set to zero.
lua_cobol_offset
Not used by LUA in Microsoft® Host Integration Server or SNA Server and should be zero.
lua_sid
Supplied parameter. Specifies the session identifier and is returned by SLI_OPEN and RUI_INIT. Other verbs use this parameter to identify the session used for the command. If other verbs use the lua_luname parameter to identify sessions, set the lua_sid parameter to zero.
lua_max_length
Not used by SLI_BIND_ROUTINE and should be set to zero.
lua_data_length
Returned parameter. Specifies the length of the BIND request/response unit (RU) data returned in the data buffer.
lua_data_ptr
For the SLI_BIND_ROUTINE this parameter contains the address of the BIND RU.
lua_post_handle
Supplied parameter. Used under Microsoft Windows Server if asynchronous notification is to be accomplished by events. This variable contains the handle of the event to be signaled or a window handle.
lua_th
Supplied parameter. Contains the SNA transmission header (TH) of the message received. Various subparameters are returned for read and bid functions.
lua_rh
Supplied parameter. Contains the SNA request/response header (RH) of the message sent or received.
lua_flag1
Supplied parameter. Contains a data structure containing flags for messages supplied by the application.
lua_message_type
Supplied parameter. Specifies the type of SNA data or command sent to the host.
lua_flag2
Returned parameter. Contains flags for messages returned by LUA.
lua_flag2.async
Indicates that the LUA interface verb completed asynchronously if set to 1.
lua_flag2.sscp_exp
Indicates SSCP expedited flow if set to 1.
lua_flag2.sscp_norm
Indicates SSCP normal flow if set to 1.
lua_flag2.lu_exp
Indicates LU expedited flow if set to 1.
lua_flag2.lu_norm
Indicates LU normal flow if set to 1.
lua_resv56
Reserved and should be set to zero.
lua_encr_decr_option
Not used by SLI_BIND_ROUTINE and should be set to zero.
Return Codes
LUA_OK
Primary return code; the verb executed successfully.
LUA_SEC_OK
Secondary return code; no additional information exists for LUA_OK.
LUA_NEGATIVE_RSP
Primary return code; either the LUA sent a negative response to a message received from the primary logical unit (PLU) because an error was found in the message, or the application responded negatively to a chain for which the end-of-chain has arrived.
Remarks
SLI_BIND_ROUTINE provides a mechanism for the Windows LUA application to examine BIND requests that are received from the host. The Windows LUA uses a user-supplied dynamic-link library (DLL) to notify the Windows LUA application that a BIND request has been received. The user-supplied DLL routine then examines the contents of the BIND and formulates a response for the request.
The DLL name for the routine is provided as extensions of the SLI_OPEN verbs VCB. The lua_extension_list_offset parameter provides the offset from the start of the VCB to the first name in the extension list.
The Windows LUA interface assigns storage space where the VCB is structured. The VCB of SLI_BIND_ROUTINE contains lua_th and lua_rh. The address of the BIND RU is specified in lua_data_ptr and the length of the RU is specified in lua_data_length.
When SLI_BIND_ROUTINE returns to the Windows LUA, processing of SLI_BIND_ROUTINE is completed. The BIND response should overwrite the BIND RU. When the BIND is accepted, the primary return code should be set to LUA_OK. If the BIND is rejected, the primary return code should be set to LUA_NEGATIVE_RSP and the BIND buffer contains the negative sense code. The lua_data_ptr parameter should not be modified.
If a negative response is returned from SLI_BIND_ROUTINE, SLI_OPEN is canceled. The lua_prim_rc of the SLI_OPEN is set to LUA_SESSION_FAILURE, and the lua_sec_rc is set to LUA_NEG_RSP_FROM_BIND_ROUTINE.
See Also
RUI_INIT
RUI_PURGE
RUI_READ
RUI_WRITE
SLI_OPEN
SLI_PURGE
SLI_RECEIVE
SLI_SEND