[
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 linkage type is one of the following values:
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		Program return code
OS400	i5/OS		Address of failure code integer
PLI	z/OS		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.