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Status-Acknowledge(ACKLUA)

  • Article

The Status-Acknowledge(ACKLUA) message is for logical unit application (LUA) applications only. It flows from the node to the application, and is used with both the system services control point (SSCP) and primary logical unit (PLU) connections.

Syntax

  
struct Status-Acknowledge(ACKLUA) {  
    PTRBFHDR  nxtqptr;  
    PTRBFELT  hdreptr;  
    CHAR      numelts;  
    CHAR      msgtype;  
    CHAR      srcl;  
    CHAR      srcp;  
    INTEGER   srci;  
    CHAR      destl;  
    CHAR      destp;  
    INTEGER   desti;  
    CHAR      sfhdr.stackhdr.akstat;  
    CHAR      sfhdr.stackhdr.akqual;  
    INTEGER   sfhdr.stackhdr.akmsgkey;  
    CHAR      sfhdr.stackhdr.akflags1;  
    CHAR      sfhdr.stackhdr.akflags2;  
    INTEGER   sfhdr.stackhdr.aknumb1;  
    INTEGER   sfhdr.stackhdr.aknumb2;  
    INTEGER   sfhdr.stackhdr.akseqno;  
};

Members

nxtqptr
Pointer to next buffer header.

hdreptr
Pointer to buffer element (NIL).

numelts
Number of buffer elements (0x00).

msgtype
Message type STATFMI (0x21).

srcl
Source locality.

srcp
Source partner.

srci
Source index.

destl
Destination locality.

destp
Destination partner.

desti
Destination index.

sfhdr.stackhdr.akstat
Status type ACK (0x01).

sfhdr.stackhdr.akqual
Acknowledgment type.

sfhdr.stackhdr.akmsgkey
Message key.

sfhdr.stackhdr.akflags1
Application flag 1.

sfhdr.stackhdr.akflags2
Application flag 2.

sfhdr.stackhdr.aknumb1
Number of replies.

sfhdr.stackhdr.aknumb2
Reserved.

sfhdr.stackhdr.akseqno
SNA sequence number.

Remarks

  • The message key and application flags are undefined and should not be checked.

  • The SNA sequence number gives the sequence number of the inbound data message to which this is an acknowledgment.