Natural under Com-plete/SMARTS

This document describes the functionality of the Natural Com-plete/SMARTS Interface (product code NCF) and the operation and individual components of Natural in a Com-plete environment.

Anmerkung:
SMARTS is an acronym for "Software AG Multi-Architecture Runtime System". It constitutes a runtime layer that allows POSIX-like applications to run on mainframe operating systems. Software AG products communicate with the operating system through the SMARTS layer.

The following topics are covered:

Related Documents:

Support for zIIP with Natural Com-plete/SMARTS Interface Version 8.3

Natural Com-plete/SMARTS Interface Version 8.3 supports IBM's System z Integrated Information Processors (zIIPs) in a Com-plete environment on z/OS.

For information on Natural for zIIP support and required prerequisites, see the Natural for zIIP documentation.

For the changes in installation, see Installing Natural Com-plete/SMARTS Interface and Installing Natural for zIIP on z/OS.

Support of zIIP-enabled Natural Roll Server with Natural Com-plete/SMARTS Interface Version 8.3

Natural Com-plete/SMARTS Interface Version 8.3 supports the Natural Roll Server. To benefit from this feature, Natural for zIIP under Com-plete and the Natural Roll Server NATRSM91 must be used. In this case the Compression and Decompression of the Natural thread is executed on IBM’s System z Integrated Information Processors (zIIPs), thus reducing the CPU load of the GCPs.

To enable the use of the Natural Roll Server:

  • Start the Natural Roll Server NATRSM91

  • Start your Natural session with TPF=(1).

Driver Parameters for the Natural Com-plete/SMARTS Interface

For information on the driver parameters that are available for the Natural Com-plete/SMARTS Interface, refer to the description of profile parameter COMP or parameter macro NTCOMP in the Parameter Reference documentation. COMP (or NTCOMP) comprises several keyword subparameters whose use is explained in the following sections.

Use of the Abend Exits

The ABEXIT exits can generally be deactivated by setting the keyword subparameter SPIEA to OFF.

The ABEXIT exit is called during Com-plete's EOJ handling for an abnormal program termination processing.

By default, an 0CX abend is interpreted by the ABEXIT exit routine.

  • When running with DU=ON/SNAP/ABEND, the Natural session is dumped and correctly terminated with error message NAT9974.

  • When running with DU=FORCE, the ABEXIT exit routine is disabled, an immediate dump during Com-plete is produced.

  • If LE370=ON is specified in the NTCOMP macro, or is specified dynamically, and the abend occurs while an LE program has control, user-written or language-specific condition handlers are ignored. The abend is handled by the ABEXIT exit routine, the Natural error message NAT0950 or NAT9967 occurs.

If DU=OFF, Natural responds with error message NAT0950, NAT0954, NAT0955 or NAT0956, and the entire abend PSW and the Registers 0 to 15 are contained in the IOCB at offset x'290'.

Storage Usage

At session initialization, the amount of space defined with the keyword subparameter NTHSIZE is allocated as thread GETMAIN above or below the 16 MB line, depending on the keyword subparameter THABOVE, for usage by Natural.

The Natural profile parameter WPSIZE determines the sizes of below and above work pools. By default, the size of the below subpool is set to 32 KB.

Therefore, you must catalog the Natural Com-plete front part with the Com-plete utility ULIB, RG size = 36 KB or larger.

The remaining areas within the Com-plete thread parts below and/or above (Com-plete ULIB RG=specification and/or THABOVESIZE=specification) are used by Com-plete for the following:

  • user subroutines,

  • increasing of variable buffers inside the Natural thread,

  • subproducts doing "physical" GETMAIN requests, this enforces the Natural work pool allocation.

For more details concerning the ULIB RG and THABOVESIZE parameters, refer to the Com-plete Utilities documentation.

Support for Back-end Programs

Natural passes the following string to a back-end program:

  • the Natural return code (fullword),

  • the Natural termination message (A72),

  • the length of the termination area (fullword),

  • the termination data.

This string is mapped by the NAMBCKP macro.

The XNCFBACK source module is an example of a Natural back-end program in a Com-plete environment. It is written as reentrant code and can be loaded as RESIDENTPAGE program or once per user.

Com-plete Support in Natural Batch Runs

If you use the Com-plete services in a Natural batch run, the batch user ID remains logged on at the end of the batch run.

To avoid this situation, include the module COMPBTCH from the Com-plete distribution library in the batch Natural nucleus. This resolves the entry point for module EOJ, which is called at the end of the Natural batch job for termination clean-up.

The module NCFAM is used to access Com-plete print/work files. It has to be included in the linking of the Natural nucleus, together with the module COMPBTCH from the Com-plete distribution library.

Asynchronous Natural Processing under Com-plete/SMARTS

Asynchronous Natural processing is discussed in the section Asynchronous Processing in the Natural Operations documentation; however, some additional considerations apply when Natural is run under Com-plete.

Make sure that appropriate SENDER and OUTDEST destinations are specified for an asynchronous Natural session; otherwise, any output will lead to an abnormal termination.

In addition to Com-plete terminal IDs for SENDER and OUTDEST, the following keywords are supported by the Natural Com-plete/SMARTS interface:

Profile Parameter Possible Values Explanation
SENDER DUMMY Output is ignored.
TID Output destination.
LUNAME
OUTDEST DUMMY Output is ignored.
CONSOLE Output destination.
LUNAME

By default, the 3270 data stream protocol is used for output of an asynchronous Natural session running under Com-plete.

An example to start an asynchronous Natural transaction under Com-plete can be found in the library SYSEXTP, program ASYNCOMP.

Invoking Natural from User Programs

The Com-plete FETCH function is used to invoke Natural from a user front-end program under Com-plete; see the Com-plete Application Programmer's Manual for details.

Storage Thread Key Handling

If you want to use protection mode between Com-plete and your application program, you must set the Natural profile parameter SKEY to OFF in the Natural parameter module. The application program runs in the corresponding thread key.

You can improve performance of the application program under Com-plete by activating the Storage-Protection Override facility on your machine.

Set the thread key to 9 in the Com-plete startup parameter THREAD-GROUP for your Natural sub-group.

The front-end driver sets the Natural application automatically to the privileged mode if the thread key is 9, and uses the SPKA instruction for the key switch handling instead of the Com-plete function MODIFY with the function codes THRD/TCS.

Storage key switching is not performed for any Natural or editor buffer pool call.

Support for User Exit Handling during Session Initialization

During session initialization, it is possible to pass user-specific session information about the activation of a user exit to Natural. The exit is called before Natural has been initialized, after the driver/IOCB initialization is complete.

The driver passes as a parameter the address of the IOCB in Register 1, whereas the exit is activated/deactivated by the Com-plete functions COLOAD/CODEL; see the Com-plete Application Programmer's Manual for details.

The NCFUEXIT source module is an example of a user exit. The user exit module can be defined with the keyword subparameter EXIT.

Use of the SMARTS Server Environment

With the SMARTS Server Environment, it is possible to use the SMARTS portable file system as a container for input and output files as well as data sets on the native file system. It depends on the setting of the SMARTS parameters CDI_DRIVER and MOUNT_FS whether the environment variable refers to a the portable file system or to a native file system. For more information, see the SMARTS Installation and Operations Manual.

If environment variables are not defined, the normal data sets are accessed as described in the section Data Sets Used by Natural under z/OS Batch in the Natural Operations documentation.

The following topics are covered below:

Input/Output

Input/output in the SMARTS Server Environment is performed by DLL NCF42IO.

NCF42IO must be loaded into the resident area. If NCF42IO is loaded into the application program thread, the Natural session is terminated with a NAT9980 error message.

Supported environment variables:

These environment variables are described below.

CMPRINT - Primary Report Output

Syntax:

CMPRINT=/pathname/filename[/],[mode]

Where

pathname

Specifies the location of the output file.

If pathname refers to a portable file system, the path will be created; if it refers to a native data set, it must be available.

filename

Specifies the name of the output file.

An asterisk (*) as the file name means that the file name is generated from the actual user ID.

If pathname refers to the native file system and filename is terminated with the slash character (/), the sequential data set pathname/filename will be accessed; if it is not terminated with "/", the member filename in data set pathname will be accessed.

mode Specifies the file mode as documented in the C Library for the fopen() function. The default is w (write).

Example: Assume /fs/ is mapped to the native file system and /pfs/ is mapped to a portable file system.

CMPRINT=/fs/natural/test/print Member print in data set natural.test is accessed.
CMPRINT=/fs/natural/test/print/ Sequential data set natural.test.print is accessed.
CMPRINT=/pfs/natural/test/print Member print in /natural/test of the portable file system is accessed.

CMSYNIN - Primary Command Input

Syntax:

CMSYNIN=/pathname/filename[/]

Specifies the pathname and filename of the appropriate command input file.

If pathname refers to the native file system and filename is terminated with the "/" character, the sequential data set pathname/filename will be accessed; if it is not terminated with a slash (/), the member filename in data set pathname will be accessed.

CMOBJIN - Input for Natural INPUT Statements

Syntax:

CMOBJIN=/pathname/filename[/]

Specifies the pathname and filename of the appropriate data input file.

If pathname refers to the native file system and filename is terminated with the slash character (/), the sequential data set pathname/filename will be accessed; if it is not terminated with a slash (/), the member filename in data set pathname will be accessed.

Print File/Work File

Print file and work file access in the SMARTS Server Environment is performed by DLL NCF42APS.

NCF42APS must be loaded into the resident area. If NCF42APS is loaded into the application program thread, the Natural session is terminated with a NAT9980 error message.

Supported environment variables:

  • NAT_PRINT_ROOT - Path to the printer files on a PFS or native file system.

  • NAT_WORK_ROOT - Path to the work files on a PFS or native file system.

Syntax Example:

NAT_WORK_ROOT=/qualifier/path1/path2

Where

qualifier

Determines whether a SMARTS portable file system or a native, OS-managed file system will be accessed.

path1/path2

Is the path to the location of the file in the appropriate file sytem.

Support for Com-plete's Recoverable Session Handling

To benefit from Com-plete’s recoverable session handling available under z/OS, you have to link the module NCFROLLS to your front-end module. NCFROLLS serves as an interface to the Natural Roll Server, which has to be started to support recoverable sessions.

Furthermore, the module ATRRCSS needs not to be linked to your front-end module, because the RRS interface module is part of the Com-plete routine TLOPUSER. When a conversational terminal I/O is to be performed, the Natural thread is written to the Natural roll file in compressed form to allow resuming the Natural session after a Com-plete restart. For non-conversational terminal I/O operations and thread locked applications, the Natural thread is not written to the Natural roll file; as a consequence, such sessions cannot be recovered.