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5-2 Oracle Tuxedo Mainframe Adapter for TCP - CICS User Guide
Making Calls from a CICS Client Program
To make a service call from a CICS program to a remote Oracle Tuxedo domain, make an EXEC
CICS LINK
call to the Pre-requester. The service you want to access must be configured by the
Oracle TMA Administrator, but from a programming point of view the
LINK call is all you need.
The following COBOL record is in the COBOL copybook
client.cbl.
Listing 5-1 COBOL Record
01 REQUEST-RECORD.
05 REQUEST-HEADER.
10 DATALEN PIC S9(08) COMP.
10 SVCNAME[16] PIC X(16).
10 REQUESTCD PIC S9(08) COMP.
10 RETURNCD PIC S9(08) COMP.
10 REQRETURNCD PIC S9(08) COMP.
05 REQUEST-DATA.
10 DATA-AREA PIC X(DATALEN).
The layout of the structure in C that must be passed in the LINK call is shown in Listing 5-2. The
following C structures are in the
clienth.h INCLUDE file.
Listing 5-2 C Structures
typedef struct CLIENTHDR
{
long DataLen; /* THE LEN OF THE DATA FROM AND TO APPL */
char SvcName[16]; /* THE SERVICE NAME */
long RequestCd; /* THE REQUEST COMMAND FROM THE APPL */
long ReturnCd; /* THE RETURN CODE TO THE APPL */
long ReqReturnCd; /* THE RETURN CODE FROM THE PREQ AND REQ */
} CLIENTHDR;
typedef struct CMAREA
{