SYSRDC Utility

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# SYSRDC Utility

The SYSRDC utility is used to record monitoring and accounting data on the internal process flow within a Natural application. This data can be used for evaluating Natural session activities in external or Natural programs. The data is collected at events performed within Natural.

The SYSRDC Utility documentation covers the following topics:

- Functional Components of SYSRDC

- Data-Collecting Events

- Data Collected

- Activating and Controlling the Natural Data Collector

- Trace Recording

- User Exits for External Monitoring/Accounting

- Calling the CMRDC Interface

- Example Programs

#### Related Topics

- See also the documentation on the Profiler Utility, a menu-driven tool for generating and listing trace records.

- RDC - Configure the Natural Data Collector

## Functional Components of SYSRDC

This section describes the components the SYSRDC utility provides in order to collect data and supply it for further processing.

- Natural Data Collector as part of the Natural nucleus:
  Collects data and controls data recording in the Natural Data Collector buffer.

- User exits:
  Passes data to external monitoring and accounting programs.

- CMRDC interface:
  Evaluates data in a Natural program for the current Natural session.

## Data-Collecting Events

Events specify activities within Natural. The table below lists the events at which data is collected within Natural and the types of event available.

Each type of event is assigned a one- or two-letter code where the first letter represents the group of event and any second letter the subtype.

For example, in the event type PL, P represents the event group "program" and L the subtype "load".

Event | Event Type
--- | ---
Session initialization. | SI
Session termination. | ST
Program load. | PL
Program start. | PS
Program termination. | PT
Before database call. | DB
After database call. | DA
Before terminal I/O. | IB
After a terminal I/O. | IA
Before non-Natural program call. | CB
After non-Natural program call. | CA
Runtime error. | E
Internal trace call. Anmerkung The information internal traces provide is only intended for debugging purposes by support. See below. | N
Natural statement. Anmerkung See below. | NS
Outbound RPC message. | RO
Inbound RPC message. | RI
Start of RPC request execution. | RS
Wait for RPC client request | RW
User-defined event. | U

To activate an internal trace call event

1. Set the Natural profile parameter `ITRACE=ON`.

2. Define the Natural components that are to issue internal trace calls:

   - By using the NTTRACE macro of the Natural parameter module.

   - Or, by setting the dynamic Natural profile parameter TRACE.

To activate a Natural statement event

- Set Natural profile parameter `ITRACE=ON` and `TRACE=NATPROX`.

The NTTRACE macro and the parameters ITRACE and TRACE are described in the Parameter Reference documentation.

## Data Collected

The data the Natural Data Collector collects at events are described in the following section.

For the layout of the data, see the Natural source data set (file) NAMRDC, or the local data area RDCDATA that is provided in the Natural system library SYSRDC.

The data collected can be split into two categories: general and event-specific data.

- General Data

- Event-Specific Data

### General Data

The following general data is collected at every event:

- Product name

- Product version

- Operating system

- TP monitor

- Run modes, such as addressing or residence mode of the Natural nucleus and the buffer pool

- TP user or batch job name

- TP terminal ID

- Current Natural user ID

- Current Natural Security user group ID

- Current Natural library

- Current Natural program

- Current program level

- Line number of program statement currently executed

- session CPU time (same format as `*CPU-TIME`)

### Event-Specific Data

The following data is only collected at the following events:

Event | Data Elements
--- | ---
Session initialization | none
Session termination | Termination return code Natural termination message code NAT99nn Name of back-end program
Program load | Name of program to be loaded Name of load library Invocation type
Program start/termination | Program type Program name Program library name Database ID of program library File number of program library
Database call | Database type Command code Command ID Database ID File number Pointer that lists parameter addresses (only useful for user exits) Response code (only for event type DA) Error subcode (only for event type DA) Adabas command time (only for event type DA)
Terminal I/O | Number of bytes sent Number of bytes read Total session storage allocated Compressed session storage length
Non-Natural program call | Name of program called Calling mode, such as dynamic or static mode Program link location Parameter type Parameter address Program entry address Response code (only for event type CA)
Runtime error | Natural system error message code External abend code Name of error handling program as specified with the Natural profile parameter ETA (see the relevant section in the Parameter Reference documentation).
Internal trace call | Up to 250 bytes of information on Natural nucleus components The information provided is only intended for debugging purposes by support.
Natural statement | Up to 250 bytes of information on performed Natural statements
RPC request | RPC-specific information: Environment: C = client, S = server. RDC subtype S: subprogram name, Adabas user ID (ETID), conversation status, logon indicator (Y = logon performed), impersonation indicator of RPC request (Y = impersonation performed). RDC subtypes O, I and W: transport protocol, RPC function, type of client user ID, length of message, return code of transport layer, external conversation ID, client user ID, server node (outbound message of client only), server name (outbound message of client only).
User-defined event | Up to 250 bytes of user-defined information

## Activating and Controlling the Natural Data Collector

The Natural Data Collector is activated and controlled by the Natural profile parameter RDC (see also the relevant section in the Parameter Reference documentation).

By default, the parameter is set to `RDC=OFF`, which means that the Natural Data Collector is deactivated and trace recording must be activated separately. To alter settings, use the NTRDC macro described in the RDC entry in Parameter Reference.

The following values and keyword subparameters are available for the profile parameter RDC:

Value/Subparameter | Description
--- | ---
ON | With `ON`, the trace recording is started automatically during Natural session start.
OFF | Natural Data Collector is deactivated and trace recording must be activated separately.
EVENT | Specify events to be recorded. Specify `ALL` to record all events. See EVENT - Natural Data Collector Events to be Recorded. Anmerkung As an alternative, you can use Natural statement `CALL 'CMRDC' 'T'`. See Selecting Event Types for Trace Recording.
EXIT | Define user exits; see EXIT - Define Natural Data Collector User Exits.
FNAT | Control trace recording while Natural system file programs are executing. See FNAT - Trace Recording in the Natural System File.
SIZE | Specify the buffer size for the Natural Data Collector. In addition, it controls the trace recording function of the Natural Data Collector. See SIZE - Size of the Natural Data Collector Buffer. Anmerkung As an alternative, you can use the equivalent Natural profile parameter RDCSIZE.

## Trace Recording

The event data collected is always supplied to user exits to be used by external monitoring/accounting programs as described in the relevant section. Independently of the user exists, you can record the event data of the current Natural session in the Natural Data Collector buffer. This can be useful for testing purposes. In this section, the recording of data in the Natural Data Collector buffer is referred to as trace recording.

By default, trace recording is not active when you start a session. To make trace recording being activated when starting a session, set `RDC=ON`, see RDC - Configure the Natural Data Collector. As a prerequisite, the RDC subparameter SIZE must be set to a value greater than 2. You can also enter one of the following commands to start trace recording:

- system command `RDC ON`

- terminal command `%<RDC+`

- Natural statement `CALL 'CMRDC' 'S'`

Anmerkungen:

1. The Natural Data Collector buffer is filled in wrap-around mode; that is, the oldest record is overwritten when the buffer becomes full. At the end of the session, the contents of the buffer are deleted.
2. By default, trace recording does not cover system file FNAT. To include system file FNAT, set subparameter `FNAT=ON`.

Trace recording ends:

- system command `RDC OFF`

- terminal command `%<RDC-`

- Natural statement `CALL 'CMRDC' 'P'`

- when a session is terminated

## User Exits for External Monitoring/Accounting

The event data can be passed to external monitoring and accounting programs for evaluation of activities in Natural sessions. This is accomplished with the user exits and the examples of user-exit programs provided. User-exit programs are written in assembly language.

The Natural Data Collector supports any number of user exits. A user exit can be defined by the Natural profile parameter RDCEXIT (see the relevant section in the Parameter Reference documentation). An external monitoring/accounting program can be attached to each user exit.

Three exit names are predefined: RDCEX1, RDCEX2 and RDCEX3. If you use one of these names as entry point for your exit (which is linked to the Natural nucleus), the Natural profile parameter RDCEXIT is not required.

At every event listed under Data-Collecting Events, the user exits take over control by using the standard linkage call conventions described in the table below:

Register | Contents
--- | ---
1 | Points to a parameter address list that consists of two addresses: one address points to the general data and the other points to event-specific data. The layout of these areas is mapped by the DSECT RDCGDATA and RDCLDATA respectively. Both DSECTs are supplied in source form in the Natural macro NAMRDC.
13 | Points to a 72-byte standard save area.
14 | Contains the return address.
15 | Contains either the entry point address or the return code of the user exit.

Anmerkung
The user exits are called independently of the CMRDC interface.

A user-exit program must have the same attributes as Natural; that is, it must have the same addressing mode, and it has to be reentrant. It must be linked with the Natural nucleus according to the conventions of statically linked non-Natural programs. See also the profile parameters CSTATIC and RCA described in the Parameter Reference documentation.

By default, a 400-byte exclusive work area (per session) is supplied for each user exit (the field RDCGWRKA). If a larger work area is required for a user exit, it can be specified after the user-exit name in the Natural profile parameter RDCEXIT (see the relevant section in the Parameter Reference documentation). The work-area length is passed on to the user exits in the field RDCGWRKL and can be used for verification. The location of this work area can change during a session due to Natural relocation, but its contents are preserved.

In TP-monitor environments, the TP anchor address is supplied (the field RDCGANCH); for example, the CSA address under CICS. It can be used to access system information.

If a Program Check occurs during the execution of a user-exit program, further data collecting is disabled for the rest of the session to avoid recursive abend situations.

The section below contains information on:

- Return Codes

- Examples of User-Exit Programs

### Return Codes

Non-zero return codes are only supported for two events:

- Before a database call, where Register 15 can contain an Adabas response code, which is stored in the control block; the Adabas call will not be executed.

- At program start, where Register 15 can contain a Natural error message code; the program will not be executed, but an error condition will occur with the specified number.

### Examples of User-Exit Programs

The following examples of user-exit programs are provided in the following Natural source data sets (files):

Program | Data Set (File) | Used for
--- | --- | ---
NAMRDC | NATnnn.SRCE | DSECT macro for general and event-specific data
XNATRDC1 | NATnnn.SRCE | Natural TSO Interface and Natural batch interface under z/OS
XNCFRDC1 | NCFnnn.SRCE | Com-plete
XNCIRDC1 | NCInnn.SRCE | Natural CICS Interface

## Calling the CMRDC Interface

The CMRDC application programming interface is used for retrieving and controlling the trace data recorded in the Natural Data Collector buffer. This can be useful for testing purposes.

To invoke the CMRDC interface

- In the Natural program, issue a CALL statement.

The functions provided by the CMRDC interface and the syntax that applies to the corresponding Natural CALL statements are described in the following section.

In addition, the Natural system library SYSRDC provides example programs and the appropriate local data area RDCDATA in which the structure of trace records is defined. Acording to this definition, a trace record has two main components: one to cover general data and one to cover event specific data.

The section below contains information on:

- Retrieving Trace Records

- Stopping and Restarting Trace Recording

- Selecting Event Types for Trace Recording

- User-Defined Events

- Retrieving the Trace Status

- CMRDC Return Codes

### Retrieving Trace Records

To read the data from the Natural Data Collector buffer, invoke CMRDC with the following Natural statement:

`CALL 'CMRDC'` function event-time gen-data event-data seq.-number

The following parameters are passed:

Parameter | Format/Length | Explanation
--- | --- | ---
function | A1 |
F | Get first trace record.
G | Get next trace record.
N | Get record of sequence number specified.
event-time | N10 or N12 | Time of event The time is passed back in either of the following formats:
HHMMSSXXXX | HH = hours, MM = minutes, SS = seconds, XXXX = fraction of a second
HHMMSSXXXXXX | HH = hours, MM = minutes, SS = seconds, XXXXXX = fraction of a second
gen-data | A252 | General data (field `GDATA`)
event-data | A252 | Event-specific data (field `LDATA`)
seq.-number | I4 | Sequence number of record Only applies to Function N (see above).

The retrieval functions stop recording data in the Natural Data Collector buffer implicitly.

### Stopping and Restarting Trace Recording

To stop or restart trace recording data in the Natural Data Collector buffer, invoke CMRDC with the following statement:

`CALL 'CMRDC'` function

The following parameter is passed:

Parameter | Format/Length | Explanation
--- | --- | ---
function | A1 |
S | Clear Natural Data Collector buffer and restart trace recording.
P | Stop trace recording.

### Selecting Event Types for Trace Recording

By default, all events are selected for trace recording. Use this function if you wish only specific events to be recorded.

Anmerkungen:

1. This function only selects the events at which data is to be recorded in the Natural Data Collector buffer. It does not affect the data passed to the user exits. Neither does it affect the status (started/stopped) of trace recording.
2. Events can also be specified by subparameter EVENT of the profile parameter RDC, see Activating and Controlling the Natural Data Collector.
3. This function replaces any previous event definition.

To select the types of event to be recorded, invoke CMRDC with the following statement:

`CALL 'CMRDC'` function type `...`

The following parameters are passed:

Parameter | Format/Length | Explanation
--- | --- | ---
function | A1 |
T | Select events for trace recording.
type | A1, A2 or A3 | The one- or two-letter code for the event type to be recorded as listed in Data-Collecting Events. Specify any number of parameters for the event types desired. Alternatively, you can select a range of events or no event:
ALL | All event types.
value* | All event types that start with value. For example, P* selects all events of the type program: PL, PS and PT.
blank | A blank character selects no event.

### User-Defined Events

To specify a user-defined event, invoke CMRDC with the following statement:

`CALL 'CMRDC'` function record

The following parameters are passed:

Parameter | Format/Length | Explanation
--- | --- | ---
function | A1 |
U | User-defined trace event.
record | Annn | Trace record with a length (nnn) of up to 250 bytes

### Retrieving the Trace Status

To retrieve the trace status and the event types currently set, invoke CMRDC with the following statement:

`CALL 'CMRDC'` function status types

The following parameters are passed:

Parameter | Format/Length | Explanation
--- | --- | ---
function | A1 |
C | Retrieve trace status.
status | A1 | Current trace status:
S | Trace active
P | Trace inactive
types | Ann | The two-letter codes for the event types currently set; see Selecting Event Types for Trace Recording. The variable types requires a minimum length (nn) of 64 bytes to provide sufficient space for all event types. This parameter is optional.

### CMRDC Return Codes

Code | Meaning
--- | ---
0 | Function executed successfully.
4 | Last trace record. If event type is 0, there is no trace data for function F. Only applies to Functions F and G (see above).
8 | Too few parameters for this function.
12 | Invalid function code.
16 | Natural Data Collector not active, for example, RDCSIZE=0.
20 | Natural Data Collector disabled after an error.
24 | No buffer space available for trace recording (RDCSIZE=2).
28 | Invalid parameter value. Only applies to Functions T and N (see above).

## Example Programs

The Natural system library SYSRDC contains the following example programs:

Program | Function
--- | ---
RDCDISP | Display all records in the Natural Data Collector buffer and show the fields as specified in the program. See also Example Output of Program RDCDISP below.
RDCSTART | Restart trace recording.
RDCSTOP | Stop trace recording.
RDCSET | Select events for trace recording.
RDCUSER | User-defined event.
RDCSTAT | Retrieve trace status.
RDCDISIO | Display all I/O-related records in the Natural Data Collector buffer and show the fields as specified in the program. See also Internal Validity Check and Tracing for I/O-related Statements and Example Output of Program RDCDISIO below.

### Example Output of Program RDCDISP

The example screen below shows the extract of an output report produced by the example program RDCDISP.

     ETIME1   TY  GCUID   LV   GPGM   T  GCAPL    PRLIB    PRNAM   CO  DB   FN  RC
    --------- -- -------- -- -------- - -------- -------- -------- -- ---- ---- ---

       0.0000 SI SAG                    SYSTEM
       0.0002 DB SAG                    SYSTEM                     OP   10
       0.0002 DA SAG                    SYSTEM                     OP   10
       0.0000 DB SAG                    SYSTEM                     S1   10 1640
       0.0005 DA SAG                    SYSTEM                     S1   10 1640
       0.0001 PL SAG                    SYSTEM   SYSLIB   MAINMENU
       0.0001 PS SAG       1 MAINMENU F SYSTEM   SYSLIB   MAINMENU      10 1640
       0.0001 PL SAG       1 MAINMENU   SYSTEM   SYSLIB   NAT00029
       0.0000 DB SAG       1 MAINMENU   SYSTEM                     S1   10 1640
       0.0002 DA SAG       1 MAINMENU   SYSTEM                     S1   10 1640
       0.0000 PS SAG       2 NAT00029 N SYSTEM   SYSLIBS  NAT00029      10 1640
       0.0000 CB SAG       2 NAT00029   SYSTEM            CMMPP    S
       0.0000 CA SAG       2 NAT00029   SYSTEM            CMMPP    S
       0.0000 PT SAG       2 NAT00029 N SYSTEM   SYSLIBS  NAT00029
       0.0000 PL SAG       1 MAINMENU   SYSTEM   SYSLIB   USR2003P
       0.0000 PS SAG       2 USR2003P N SYSTEM   SYSLIB   USR2003P      10 1640
       0.0001 PT SAG       2 USR2003P N SYSTEM   SYSLIB   USR2003P
       0.0000 CB SAG       1 MAINMENU   SYSTEM            CMUB     S

The following table describes the columns that are displayed on the example screen, and the variables to which they refer. For some events the data displayed PRLIB etc. has a different meaning. For further information, see the comments in the program source and the local data area RDCDATA. For an explanation of the Natural system variables mentioned, refer to the System Variables documentation.

Column | Explanation
--- | ---
ETIME1 | Time interval in seconds between the execution of the current and the previous event.
TY | Type of event as listed in Data-Collecting Events.
GCUID | Current Natural user ID as assigned by the Natural system variable `*USER`.
LV | Program level.
GPGM | Name of the current program as assigned by the Natural system variable `*PROGRAM`.
T | Type of program.
GCAPL | ID of the current application library as assigned by the Natural system variable `*APPLIC-ID`.
PRLIB | ID of the library where the program is stored. Applies to events of the type program, for example, event type `PL`.
PRNAM | Name of the program to be loaded for the type of event.
CO | Database command.
DB | Database ID.
FN | File number of database.
RC | Database or program call response code.

### Internal Validity Check and Tracing for I/O-related Statements

To detect `NAT1132` errors, and to facilitate debugging, information relevant to the error type (such as lengths of lines and fields, or buffer offsets) can be collected by trace recording. After processing an I/O statement (such as `WRITE` and `DISPLAY`) a validation routine is executed to check the buffers `IOPAGE` and `IOPATTR` for validity and consistency, for example with respect to presence of a line separator. If a potential error is detected, a message (`NAT1132 condition detected`) is written to the Natural Data Collector buffer, together with information that helps to locate the error, and trace recording is stopped to avoid this result to be hidden by subsequent irrelevant data.

To activate NAT1132 trace recording, specify the following Natural profile parameters:

`ITRACE=ON,RDCSIZE=128,TRACE=IO`

If a trace was created for a program that you have run, you can display I/O-related records by executing `RDCDISIO` in system library SYSRDC.

#### Example Output of Program RDCDISIO

The following screen shows (a fragment of) a trace report produced by the program `RDCDISIO`. See the definition list below for an explanation of the column headings.

     GCUID   LV   GPGM    GCAPL                       NDATA
    -------- -- -------- -------- ---------------------------------------------
    MK        1 LOGON    SYSTEM   INO2  08 F 005041700618 (R6)
    MK        1 MYDEMO   MK       INO2  00 F 001A00200609 (R6)
    MK        1 MYDEMO   MK       IOIPR    F 001A00200609 50 50 0050 0050
    MK        1 MYDEMO   MK       INO2  04 F 001A00200609 (R6)
    MK        1 MYDEMO   MK       INO2  00 F 001A00200609 (R6)
    MK        1 MYDEMO   MK       IOIPR    F 001A00200609 50 50 0050 0050
    MK        1 MYDEMO   MK       INO2     F 10C000C8C9C5 (R6) BEG OF  IOPRI
    MK        1 MYDEMO   MK       IOEUP    F 000000A0 0F  (PATTRADF/LNG)
    MK        1 MYDEMO   MK       IOEUP    F 000000A0 0F  (PATTRADF/LNG)
    MK        1 MYDEMO   MK       IODRU    F 000000B0 3F  (PATTRADF/LNG)
    MK        1 MYDEMO   MK       INO2     F 000A00301804 (R6) END OF  IOPRI
    MK        2 MYDEMON  MK       INO2  00 N 001801700609 (R6)
    MK        2 MYDEMON  MK       IOIPR    N 001801700609 4F 50 004F 0050
    MK        2 MYDEMON  MK       IOIPR    N LINE SIZE HAS CHANGED
    MK        2 MYDEMON  MK       INO2     N 058000800104 (R6) BEG OF  IOPRI
    MK        2 MYDEMON  MK       IOEUP    N 000000F0 08  (PATTRADF/LNG)
    MK        2 MYDEMON  MK       IOEUP    N 000000F0 08  (PATTRADF/LNG)
    MK        2 MYDEMON  MK       IOEUP    N 000000F9 32  (PATTRADF/LNG)
    MK        2 MYDEMON  MK       IOEUP    N 000000F9 32  (PATTRADF/LNG)
    MK        2 MYDEMON  MK       IOEUP    N 0000012C 12  (PATTRADF/LNG)
    MK        2 MYDEMON  MK       IOEUP    N 0000012C 12  (PATTRADF/LNG)
    MK        2 MYDEMON  MK       IOPRI    N NAT1132 CONDITION DETECTED
    MK        2 MYDEMON  MK       IOEUP    N 0000013F 32  (PATTRADF/LNG)
    MK        2 MYDEMON  MK       IOEUP    N 0000013F 32  (PATTRADF/LNG)
    MK        2 MYDEMON  MK       IOEUP    N 00000172 32  (PATTRADF/LNG)
    MK        2 MYDEMON  MK       IOEUP    N 0000018F 1E  (PATTRADF/LNG)
    MK        2 MYDEMON  MK       IOEUP    N 0000018F 1E  (PATTRADF/LNG)
    MK        2 MYDEMON  MK       IODRU    N 000001AE 30  (PATTRADF/LNG)
    MK        2 MYDEMON  MK       INO2     N 00060180FF08 (R6) END OF  IOPRI
    MK        2 MYDEMON  MK       INO2     N NAT1132 CONDITION 1 DETECTED

GCUID | Current Natural user ID as assigned by the Natural system variable `*USER`.
LV | Program level.
GPGM | Name of the current program as assigned by the Natural system variable `*PROGRAM`.
GCAPL | ID of the current application library as assigned by the Natural system variable `*APPLIC-ID`.
NDATA | Up to 250 bytes of information on Natural nucleus components, to be used by support for debugging.

### On this page

- Functional Components of SYSRDC
- Data-Collecting Events
- Data Collected
- Activating and Controlling the Natural Data Collector
- Trace Recording
- User Exits for External Monitoring/Accounting
- Calling the CMRDC Interface
- Example Programs