IBM AS/400 manual Using the Fixed-Form Call Operations, CALLB only

Using the Fixed-Form Call Operations

2.Optionally code an error indicator (positions 73 and 74) or an LR (positions 75 and 76) or both.

When a called object ends in error the error indicator, if spe Similarly, if the called object returns with LR on, the LR indicat set on.

3.To pass parameters to the called object, either specify a PLIS field of the call operation or follow the call operation immediate operations.

Either	operation transfers			control	from	the calling to			the called obje
called	object is	run,	control returns			to	the	first	operation that ca
the call operation		in	the	calling	program		or	procedure.

The following considerations apply to either call operation:

¹The Factor 2 entry can be a variable, literal, or named constant. entry is case-sensitive.

For CALL only: The Factor 2 entrylibrcaryn bename/program ,namefor

example, MYLIB/PGM1. If no library name is specified, then the li used to find the program. The name of the called program can be run time by specifying a character variable in the Factor 2 ent

For	CALLB only:	To make a procedure pointer	call you specify the
the	procedure	pointer which contains the	address of the procedu

¹A procedure can contain multiple calls to the same object with the different PLISTs specified.

¹When an ILE RPG procedure (including a program entry procedure) i called, the fields are initialized and the procedure is given c quent calls to the same procedure, if it did not end on the pr

fields,

indicators,

and

files

in

the

called procedure are the s

when

it returned on

the

preceding call.

¹ The

system

records

the

names

of

all

programs

called

within

an

RPG

When an RPG procedure is bound

into

a program

(*PGM)

you can

quer

names

using

DSPPGMREF,

although you cannot

tell which procedure

or

module

is

doing the

call.

If you call a program using a variable, you will see an entry w *VARIABLE (and no library name).

For a module, you can query the names of procedures called using DETAIL(*IMPORT). Some procedures on this list will be system procedur names of these will usually begin with underscores or contain blanks do not have to be concerned with these.

¹For CALLB only: The compiler creates an operational descriptor indic

number		of	parameters passed on the CALLB		operation	and	places this
the	*PARMS		field of the called procedure's program			status data		str
number		includes any parameters which		are	designated as		omitted	(
the	PARM		operation).
If	the		(D) operation extender is	used	with the	CALLB	operation

also creates an operational descriptor for each character and gr subfield.

Chapter 10. Calling Programs and Procedures149