SYSEXT Utility - Natural Application Programming Interfaces

The utility SYSEXT is used to locate and test Natural Application Programming Interfaces (APIs) contained in the current system library SYSEXT.

A Natural API is a Natural subprogram (cataloged object) that is used for accessing and possibly modifying data or performing services that are not accessible by Natural statements. Natural APIs refer to Natural, a subcomponent or a subproduct.

The SYSEXT Utility - Natural Application Programming Interfaces documentation covers the following topics:

• Introduction to SYSEXT

• Invoking and Terminating SYSEXT

• Using the SYSEXT Utility

• Interface Versions

• Reserved Keywords

• Using a Natural API

• List of Natural APIs

Related Topics:

• Application Programming Interfaces - Natural Security documentation

• Natural Functions - System Functions documentation

Introduction to SYSEXT

For each Natural API, the utility SYSEXT provides a functional description, one example program, one category and API-specific keywords.

The following diagram is an overview of the Natural objects and major features SYSEXT provides:

Objects Provided for Natural APIs

The types of Natural object typically provided for each Natural API are listed in the following section. Additional objects that might exist for a particular API are not covered.

All API-related objects are contained in the library SYSEXT on the system file FNAT.

In the following table, nnnn denotes the 4-digit number to identify the API as well as the corresponding example program and text object.

Invoking and Terminating SYSEXT

The SYSEXT utility is invoked by the system command SYSEXT which is described by the following syntax diagram:

The table below gives a description of the parameters:

To invoke SYSEXT

• Enter the following system command:

  SYSEXT

  A menu similar to the example below appears with a list of all available Natural APIs displayed according to the first menu:

  10:57:31 ***** NATURAL SYSEXT UTILITY ***** 2012-04-23 User SAG - Menu - Library SYSEXT Cmd Interface Description Prod --- USR*____ _____________________________________________________________ *__ _ USR0010N Get SYSPROF information NAT _ USR0011N Get information on logical file NAT _ USR0020N Read any error message from FNAT or FUSER NAT _ USR0040N Get type of last error NAT _ USR0050N Get SYSPROD information NAT _ USR0060N Copy LFILE definition from FNAT to FUSER NAT _ USR0080N Get or set type and name of editor contents NAT _ USR0120N Read Natural short error message NAT _ USR0210N Save, catalog or stow Natural object NAT _ USR0220N Read Natural long error message NAT _ USR0221N Read Natural long error message NAT _ USR0320N Read user short error message from FNAT or FUSER NAT _ USR0330N Read Natural object directory NAT Category .. ______________________________ Keyword .. ____________________ Command ===> Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12--- Help Reset Exit Desc Curr -- - + ++ > Canc

You can invoke SYSEXT with any parameters, for example to display the second menu at startup:

SYSEXT SECOND

This results in a menu similar to the one below:

 10:57:31              ***** NATURAL SYSEXT UTILITY *****             2012-04-23
 User SAG                            - Menu -                   Library SYSEXT

 Cmd Interface Description                        Category
 --- USR*____  __________________________________ *_____________________________
  _  USR0010N  Get SYSPROF information            SYSTEM COMMANDS
  _  USR0011N  Get information on logical file    SYSTEM FILES
  _  USR0020N  Read any error message from FNAT o ERROR MESSAGES
  _  USR0040N  Get type of last error             ERROR HANDLING
  _  USR0050N  Get SYSPROD information            SYSTEM COMMANDS
  _  USR0060N  Copy LFILE definition from FNAT to SYSTEM FILES
  _  USR0080N  Get or set type and name of editor EDITOR
  _  USR0120N  Read Natural short error message   ERROR MESSAGES
  _  USR0210N  Save, catalog or stow Natural obje NATURAL OBJECTS
  _  USR0220N  Read Natural long error message    ERROR MESSAGES
  _  USR0221N  Read Natural long error message    ERROR MESSAGES
  _  USR0320N  Read user short error message from ERROR MESSAGES
  _  USR0330N  Read Natural object directory      NATURAL OBJECTS

 Category .. ______________________________  Keyword .. ____________________
Command ===>
Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12---
      Help  Reset Exit  Desc  Curr  --    -     +     ++    <           Canc

As an alternative, you can invoke SYSEXT without parameters and then adjust the resulting menu, see PF Keys.

To terminate SYSEXT

• On the SYSEXT utility menu, press PF3 or PF12.

  Or:
  In the command line, enter a period (.) or enter EXIT.

Using the SYSEXT Utility

This section covers the following topics:

• Elements of the SYSEXT Utility Menu

• PF Keys

• Line Commands

• Utility Commands

Elements of the SYSEXT Utility Menu

The SYSEXT utility menu provides a list of APIs. For each API, there is an API name (Interface), a description (Description), and, depending on the menu chosen, a classification according to product code (Prod) or category (Category). Except for the leftmost column (Cmd), each column is headed by a selection field that allows you to enter selection criteria.

You can also use the search field Category at the bottom of the menu to search for available categories.

The input field Keywords can either be used as search field to retrieve available keywords, or as selection field to retrieve APIs.

You can also specify selection criteria on multiple selection fields. For example, you can select in one step APIs beginning with USR4, and with keyword PF-KEY and category NATURAL ENVIRONMENT.

A detailed description of all menu elements and their usage is given below:

Category Search

• Enter an asterisk (*), or a prefix in the category search field optionally delimited by an asterisk, for example:

  N*

  As a result, a menu similar to the example below appears:

  Search for Categories Mark Category ---- N*____________________________ _ NATURAL ENVIRONMENT _ NATURAL OBJECTS

  To select a specific category as selection criterion, enter any character in the Mark column. As a result, a list of all APIs with this selection criterion is displayed.

Keyword Search

• Enter an asterisk (*), or a prefix delimited by an asterisk, for example:

  PF*

  A menu similar to the example below appears with a separate window displaying keywords starting with PF.

  Search for Keywords Mark Keyword ---- PF*_________________ _ PF-KEY _ PF-KEY LINE

  To select a specific keyword as selection criterion, enter any character in the Mark column. As a result, a list of all APIs with this selection criterion is displayed.

Keyword Selection

• Enter a keyword in full, for example:

  PF-KEY

  As a result, a list of all APIs with keyword PF-KEY is displayed.

  Note:
  A non-trailing asterisk is interpreted literally, for example entering *LANGUAGE results in a list of APIs with keyword *LANGUAGE.

PF Keys

You can use the following PF keys:

Line Commands

Line commands are used to perform object operations. You can enter a line command in the Cmd column next to the API required. For a list of valid line commands, enter a question mark (?) or press PF1.

The following line commands are available:

Utility Commands

This section covers the following utility commands to be entered in the command line:

• EXIT
  Exit the SYSEXT utility.

• REFRESH
  Update API information using data from the objects contained in the current library SYSEXT. The REFRESH command is only required if an API description or a keyword has been modified or if a text object has been added or removed.

  Upon successful completion, there is a confirmation that the text modules EXT-XML1 and EXT-XML2 have been generated in library SYSEXT.

  Note:
  Do not modify the source objects EXT-XML1 and EXT-XML2. They are required for configuring the SYSEXT utility and intended for Software AG internal use only.

Interface Versions

Interface versions can be seen as a collection of APIs with (almost) the same functionality but with differently extended parameter specifications. Thus, they cover a development cycle to be kept explicit for sake of compatibility (of later versions with earlier versions).

If an API has interface versions, they are displayed in the corresponding text object USRnnnnT. Interface versions are ordered within a list according to the version they belong to. The rightmost element belongs to the current version. This status is expressed by the reserved keyword +CURRENT-VERSION. All other elements belong to a previous version and are marked with the reserved keyword +PREVIOUS-VERSION. APIs without interface versions are called unique.

APIs with interface versions are displayed intensified on the menu.

The list of all current APIs (see PF5) consists of all unique APIs and the current version of APIs with interface versions (with keyword +CURRENT-VERSION).

Reserved Keywords

Reserved keywords refer to meta information on APIs, for example the Natural version in which an API has been added. Reserved keywords always start with a plus sign (+). See the table below for a description:

Using a Natural API

If you want to use a Natural API contained in the system library SYSEXT, perform one of the following steps:

• Define the system library SYSEXT in the system file FNAT as a steplib library for the user library that contains the Natural objects that use this API. Thus, no API-specific actions are required when upgrading your Natural version.

• Copy the required API to the system library SYSTEM in the system file FNAT. Thus, you only need to check a single library for APIs when upgrading your Natural version.

• Copy the required API to the system library SYSTEM in the system file FUSER (not recommended).

• Copy the required API to the user library (or one of its steplibs) in the system file FUSER which contains the Natural objects that use this API (not recommended).

An API can only be used in the Natural version with which it is delivered. It is strongly recommended to store the APIs only in the FNAT system file. This will ensure that the right version is always executed.

To make use of an interface

1. In the calling program, use the DEFINE DATA statement to specify the parameters listed in the text object USRnnnnT of that API. In the example program USRnnnnP, the parameters are defined within the DEFINE DATA LOCAL statement. Alternatively, you can specify the parameters outside the calling program in a separate LDA (Local Data Area) or PDA (Parameter Data Area), with a DEFINE DATA LOCAL USING statement referencing that data area.

2. Enter the following statement:

   CALLNAT 'USRnnnnN' parameters

   For further information, see the CALLNAT statement in the Statements documentation.

Note:
Non-standard usage is always documented in the respective text object USRnnnnT.

List of Natural APIs

The following table gives an overview of available APIs and their function.

Notes:

1. Because there can be situations where a newly added API is not yet covered by the current documentation, we recommend to rely on the list of APIs in the SYSEXT utility in cases where being up-to-date is vital.
2. For detailed information on the use of APIs that apply to Natural Remote Procedure Call (RPC), refer to section Application Programming Interfaces for Use with Natural RPC in the Natural RPC (Remote Procedure Call) documentation.
3. APIs with product code PRD are listed and documented separately in the section Application Programming Interface in the administration part of the Predict documentation.