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GET_TP_PROPERTIES

  • Cikk

The GET_TP_PROPERTIES verb returns attributes of the transaction program (TP) and the current transaction.

The following structure describes the verb control block used by the GET_TP_PROPERTIES verb.

Syntax

  
struct get_tp_properties {  
    unsigned short  opcode;  
    unsigned char   opext;  
    unsigned char   reserv2;  
    unsigned short  primary_rc;  
    unsigned long   secondary_rc;  
    unsigned char   tp_id[8];  
    unsigned char   tp_name[64];  
    unsigned char   lu_alias[8];  
    unsigned char   luw_id[26];  
    unsigned char   fqlu_name[17];  
    unsigned char   reserve3[10];  
    unsigned char   user_id[10];  
    unsigned char   prot_luw_id[26];  
    unsigned char   pwd[10];  
};

Members

opcode
Supplied parameter. Specifies the verb operation code, AP_GET_TP_PROPERTIES.

opext
Supplied parameter. Specifies the verb operation extension. If the AP_EXTD_VCB bit is set, this indicates that the get_tp_properties structure includes the prot_luw_id member used for Sync Point support. Otherwise the verb control block ends immediately after the user_id member.

reserv2
A reserved field.

primary_rc
Returned parameter. Specifies the primary return code set by APPC at the completion of the verb. The valid return codes vary depending on the APPC verb issued. See Return Codes for valid error codes for this verb.

secondary_rc
Returned parameter. Specifies the secondary return code set by APPC at the completion of the verb. The valid return codes vary depending on the APPC verb issued. See Return Codes for valid error codes for this verb.

tp_id
Supplied parameter. Identifies the local TP. The value of this parameter was returned by TP_STARTED in the invoking TP or by RECEIVE_ALLOCATE in the invoked TP.

tp_name
Returned parameter. Supplies the TP name of the TP that issued the verb. The name is returned as a 64-byte EBCDIC string, padded on the right with EBCDIC spaces.

lu_alias
Returned parameter. Supplies the alias name assigned to the local LU. It is returned as an 8-byte ASCII string padded on the right with ASCII spaces.

luw_id
Returned parameter. Supplies the unprotected logical unit-of-work identifier for the transaction in which the TP is participating. Several TPs can be involved in a transaction. This identifier, which is assigned on behalf of the TP initiating the transaction, allows the conversation that makes up the transaction to be logically connected.

The luw_id can be represented as an luw_id_overlay structure with the following fields:

typedef struct luw_id_overlay { unsigned char fqla_name_len; unsigned char fqla_name[17]; nsigned char instance[6]; unsigned char sequence[2];} LUW_ID_OVERLAY;

luw_id.fqla_name_len

A 1-byte length of the fully qualified LU name for the LU of the originating TP.

luw_id.fqla_name

The fully qualified name of the LU for the originating TP. The name is returned as a 17-byte EBCDIC string, consisting of the NETID, a period, and the LU name. If the length of the name is fewer than 17 bytes, the instance and sequence numbers follow immediately. (Note that because of this, you should not use the fields of the luw_id_overlay structure to access those values. These are provided for compatibility only.)

luw_id.instance

A 6-byte string uniquely generated by the LU for the originating TP.

luw_id.sequence

A 2-byte number that indicates the segment of unit-of-work. (This is always set to 1, if Sync Point is not supported.)

If the luw_id length is fewer than 26 bytes, it is padded on the right with EBCDIC spaces.

fqlu_name
Returned parameter. Supplies the fully qualified name of the local LU. The name is returned as a 17-byte EBCDIC string, consisting of the NETID, a period, and the LU name. The name is padded on the right with EBCDIC spaces.

reserve3
A reserved field.

user_id
Supplied parameter. Indicates the user_id supplied by the initiating TP in the allocation request. The name is supplied as a 10-byte EBCDIC string, padded on the right with EBCDIC spaces.

prot_luw_id
Returned parameter. Contains the protected logical unit-of-work identifier for the transaction in which the TP is participating, if the conversation was allocated with synclevel Sync Point.

Several TPs can be involved in a transaction. This identifier, which is assigned on behalf of the TP initiating the transaction, allows the conversation that makes up the transaction to be logically connected.

The prot_luw_id can be represented as an luw_id_overlay structure with the following fields:

typedef struct luw_id_overlay { unsigned char fqla_name_len; unsigned char fqla_name[17]; nsigned char instance[6]; unsigned char sequence[2];} LUW_ID_OVERLAY;

luw_id.fqla_name_len

A 1-byte length of the fully qualified LU name for the LU of the originating TP.

luw_id.fqla_name

The fully qualified name of the LU for the originating TP. The name is returned as a 17-byte EBCDIC string, consisting of the NETID, a period, and the LU name. If the length of the name is fewer than 17 bytes, the instance and sequence numbers follow immediately. (Note that because of this, you should not use the fields of the luw_id_overlay structure to access those values. These are provided for compatibility only).

luw_id.instance

A 6-byte string uniquely generated by the LU for the originating TP.

luw_id.sequence

A 2-byte number that indicates the segment of unit-of-work. (This is always set to 1, if Sync Point is not supported.)

If the prot_luw_id length is fewer than 26 bytes, it is padded on the right with EBCDIC spaces.

pwd
Supplied parameter. Contains the password of the user_id of the initiating TP in the allocation request. The password is supplied as a 10-byte EBCDIC string, padded on the right with EBCDIC spaces.

Return Codes

AP_OK
Primary return code; the verb executed successfully.

AP_PARAMETER_CHECK
Primary return code; the verb did not execute because of a parameter error.

AP_BAD_TP_ID

Secondary return code; the value of tp_id did not match a TP identifier assigned by APPC.

AP_COMM_SUBSYSTEM_ABENDED
Primary return code; indicates one of the following conditions:

  • The node used by this conversation encountered an ABEND.

  • The connection between the TP and the PU 2.1 node has been broken (a LAN error).

  • The SnaBase at the TP's computer encountered an ABEND.

    The system administrator should examine the error log to determine the reason for the ABEND.

    AP_COMM_SUBSYSTEM_NOT_LOADED
    Primary return code; a required component could not be loaded or terminated while processing the verb. Thus, communication could not take place. Contact the system administrator for corrective action.

    AP_INVALID_VERB_SEGMENT
    Primary return code; the VCB extended beyond the end of the data segment.

    AP_STACK_TOO_SMALL
    Primary return code; the stack size of the application is too small to execute the verb. Increase the stack size of your application.

    AP_TP_BUSY
    Primary return code; the local TP has issued a call to APPC while APPC was processing another call for the same TP. This can occur if the local TP has multiple threads, and more than one thread is issuing APPC calls using the same tp_id.

    AP_UNEXPECTED_DOS_ERROR
    Primary return code; the operating system has returned an error to APPC while processing an APPC call from the local TP. The operating system return code is returned through the secondary_rc. It appears in Intel byte-swapped order. If the problem persists, consult the system administrator.

Remarks

This verb relates to the TP rather than a specification conversation, so the TP can issue the verb in any state. There is no state change.

The luw_id member contains fields for fqla_name_len (the length of the fully qualified LU name of the LU originating the TP), fqla_name (the fully qualified name of the LU originating the TP), instance (generated uniquely by the LU originating the TP), and sequence (always set to 1 and indicating the segment of unit-of-work).