[
result=]CallProg('
program','
subroutine','
linkage'[,
arg1][,
arg2][,
...])

result
. Optional. NUM32. This argument contains the return value from program called by the CallProg function, which is one of the following values:
0
. Success.
Non-zero
. Failure.
If you do not specify a result argument and a non-zero return code is returned from the external program, CallProg executes the following default map-level error responses:
Ends the extract.
Skips this subroutine.
program
. The name of the program that contains the subroutine. Depending on the operating system, the program is one of the following:
i5/OS
. A service program.
Linux or UNIX
. A shared object.
Windows
. A DLL.
z/OS
. A load module.
Enclose the program name in single quotes.
subroutine
. The name of the entry point in the program. Depending on the operating system, the subroutine is one of the following:
i5/OS
. The subroutine name.
Linux, UNIX, or Windows
. The subroutine name.
z/OS for Assembler, C, or COBOL
programs
. You must provide a value, but the value is ignored and the default entry point for the load module is used. Specify the same name as the program.
z/OS for PL/I programs
. If multiple fetchable subroutines reside in the same load module, specify the subroutine name.
Enclose the subroutine name in single quotes.
linkage
. The type of linkage, which determines the way that arguments are passed to and return codes are returned from the program or subroutine.
The following table describes each linkage type:
Linkage Type	Supported Operating Systems	Arguments	Returns
C	i5/OS Linux, UNIX, and Windows z/OS	Passed through the stack	Program return code
COBOL	z/OS	Passed as a list of addresses	Address of failure code integer
OS	z/OS	Passed as a list of addresses	Program return code
OS400	i5/OS	Passed as a list of addresses	Address of failure code integer
PLI	z/OS	Passed as a list of addresses	Address of failure code integer
Enclose the linkage type in single quotes.
[,
arg1
][,
arg2
][,
...
]. One or more optional arguments passed to the program or subroutine.