CRE Programmer's Guide

CRE Services
Common Run-Time Environment (CRE) Programmer’s Guide—528146-004
2-10
TNS CRE Initialization
a main routine. The following table shows an example of the syntax of a main routine,
called MYMAIN, in each of the languages supported by the CRE.
The reference manual for each language describes the syntax of a main routine.
TNS CRE Initialization
During program initialization, the TNS CRE:
•
Opens $RECEIVE, processes the startup message, ASSIGN messages, and the
PARAM message, and closes $RECEIVE.
°
For C main routines, the CRE saves the names and values of all PARAMs and
ASSIGNs and returns them to your program automatically.
°
For COBOL and FORTRAN main routines, the CRE saves the names and
values and returns them to your program if you specified the SAVE directive for
the main routine.
°
For a TAL main routine, the CRE saves the names and values and returns
them to your program if you specified the message-saving parameter in the
TAL_CRE_INITIALIZER_ function.
The TACL Reference Manual describes how you specify ASSIGNs and PARAMs in
TACL. The Guardian Programmer’s Guide describes how you process startup
messages, ASSIGNs, and PARAMs.
The CRE processes ASSIGN messages following the same rules as the
INITIALIZER system procedure. See the Guardian Procedure Calls Reference
Manual for details.
Table 2-3 on page 2-11 shows the PARAMs that the CRE explicitly processes
during initialization. The PARAM Values column shows the values that the CRE
accepts for each PARAM. The CRE terminates your program if the value
associated with any PARAM symbolic name is not valid. Termination occurs
regardless of which languages are used to create program modules.
Language Examples of Main Routine Declarations
C
int main(); /* C main routine */
{ ... }; /* called "main" */
COBOL
?MAIN mymain
IDENTIFICATION DIVISION.
PROGRAM-ID. mymain.
FORTRAN
PROGRAM mymain
TAL
pTAL
PROC mymain MAIN;
BEGIN
...
END;