Open(SSCP) Response

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

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;
};
 

Element 1

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 (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 LU.

dataru[36–37]

The local node's internal identifier for the connection (see Remarks).

dataru[38]

The type of link service used by the connection:

CESLINK (03) - SDLC
CESX25 (04) - X.25
CESDFT (10) - DFT
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 (see Error and Sense Codes), and the LPIs and names are undefined.
• The LU number indicates the LU selected by the local node from the configuration data (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.