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Open(SSCP) Response

  • Article

The Open(SSCP) Response message flows from the node to the application. It is used with an system services control point (SSCP) connection.

Syntax

struct Open(SSCP) Response {  
    PTRBFHDR  nxtqptr;  
    PTRBFELT hdreptr;  
    CHAR     numelts;  
    CHAR     msgtype;  
    CHAR     srcl;  
    CHAR     srcp;  
    INTEGER  srci;  
    CHAR     destl;  
    CHAR     destp;  
    INTEGER  desti;  
    CHAR     ophdr.openqual;  
    CHAR     ophdr.opentype;  
    CHAR     ophdr.appltype;  
    CHAR     ophdr.opluno;  
    INTEGER  ophdr.opresid;  
    INTEGER  ophdr.operr1;  
    INTEGER  ophdr.operr2;  
};  
struct Open(SSCP) Response {  
    PTRBFELT  hdreptr->elteptr;  
    INTEGER   hdreptr->startd;  
    INTEGER   hdreptr->endd;  
    CHAR      hdreptr->trpad;  
    CHAR[256] dataru;  
};

Members

nxtqptr
Pointer to next buffer header.

hdreptr
Pointer to first buffer element.

numelts
Number of buffer elements (0x01).

msgtype
Message type OPENMSG (0x01).

srcl
Source locality.

srcp
Source partner.

srci
Source index.

destl
Destination locality.

destp
Destination partner.

desti
Destination index.

ophdr.openqual
Open qualifier.

RSPOK (0x02) RSPERR (0x03)

ophdr.opentype
Open type SSCPSEC (0x01).

ophdr.appltype
Application program interface type.

0x02 (function management interface (FMI) application)

ophdr.opluno
Logical unit number.

ophdr.opresid
Resource identifier.

ophdr.operr1
Error code 1.

ophdr.operr2
Error code 2.

Element 1

hdreptr–>elteptr
Pointer to buffer element (NIL).

hdreptr–>startd
Start of data in this buffer element (1).

hdreptr–>endd
End of data in this buffer element.

hdreptr–>trpad
Reserved (1 byte).

hdreptr–>dataru
Data RU, as follows:

dataru[0–9]

Source name.

dataru[10–19]

Destination name.

dataru[20–27]

Name of the local node that accepted the Open.

dataru[28–35]

Name of the connection used by the logical unit (LU).

dataru[36–37]

The internal identifier of the local node for the connection. (For more information, see Remarks.)

dataru[38]

The type of link service used by the connection, as shown in the following table.

Link service Connection
CESLINK (03) - SDLC
CESX25 (04) - X.25
CESTR (11) - Token Ring
CESTCPIP (30) - TCP/IP
CESRELAY (31) - Frame Relay
CESCHANL (32) - Channel
CESISDN (33) – ISDN
CESETHER (34) - Ethernet 802.2

Remarks

  • The Open(SSCP) Response message consists of a buffer header and a single buffer element.

  • If the open qualifier is RSPERR, the error code is valid and the Locality Partner Index (LPIs) and names are undefined. (For more information, see Error and Sense Codes.)

  • The LU number indicates the LU selected by the local node from the configuration data. (For more information, see Opening the SSCP Connection.)

  • When the Open(SSCP) is for an LU group, the source name contains the name of the selected LU.

  • The connection identifier is an integer value. It uniquely identifies a particular connection on this local node. All sessions using the same connection will return the same identifier. This value is typically used when a link error is received on one session to determine which other sessions will be affected.