Example of session or device error in as400

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 Session or device error
Below are the situations which can lead to session or device error:
Incorrect record number in subfile SFLRCDNBR or SFLSIZ field.
In program code, at display(EXFMT) subfile code, check the value of RRN. If is zero and you are making
on the SFLDSP indicator *ON or it is un-conditional and doing display subfile. Then it will give you the
same error.
Trying to show empty subfile.
Field and position in Display file DDS is not correct.
The keywords are not properly organized in Display file DDS.
Trying to write more than 9999 record on the Display file for Load All subfile i.e.
Example
Session or device error while loading more than 9999 records in load-all subfile
Below are the steps to simulate the session or device error situation:
a) First of all write a program to fill the PF with records more than 9999.
Physical file: REC11000PF
Columns . . . :
1 80
Browse
AMIT/QRPGLESRC
SEU==>REC11000PF
FMT PF .....A..........T.Name++++++RLen++TDpB......Functions+++++++++++++++++++++++++++
*************** Beginning of data ************************************************
0001.00
0002.00
A
R REC
0003.00
A
FLD01
05S 0
0004.00
A
K FLD01
****************** End of data ***************************************************
b) Create a program to fill the physical file REC11000PF with 11000 records
Columns . . . :
6 80Browse AMIT/QRPGLESRC
SEU==>
REC11000
FMT FX FFilename++IPEASF.....L.....A.Device+.Keywords+++++++++++++++++++++++++++++
*************** Beginning of data ****************************************************
0001.00 FREC11000PFUF A E
K DISK
0002.00 DI
S
5 0
0003.00 C
FOR
I=00000 BY 1 TO 11000

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0004.00 C
EVAL
FLD01=I
0005.00 C
WRITE
REC
0006.00 C
ENDFOR
0007.00 C
SETON
LR
0008.00 *
0009.00 *
0010.00 *
****************** End of data *******************************************************
c) Create a display file to demonstrate the session or device error
Columns . . . :
1 80Browse
AMIT/QRPGLESRC
SEU==>
REC9999DSP
FMT DP .....AAN01N02N03T.Name++++++RLen++TDpBLinPosFunctions+++++++++++++++++++++++++++
*************** Beginning of data **********************************************
0001.00
A
DSPSIZ(24 80 *DS3)
0002.00
A
CA03(03 'EXIT')
0003.00
A
R RECSFL
SFL
0004.00
A
S_FLD01
5 0B 07 20
0005.00
A
R RECCTL
SFLCTL(RECSFL)
0006.00
A
SFLPAG(15)
0007.00
A
SFLSIZ(9999)
0008.00
A 40
SFLCLR
0009.00
A 41
SFLDSP
0010.00
A 42
SFLDSPCTL
0011.00
A 45
SFLEND(*MORE)
0012.00
A
RCDNBR
4S 0H
SFLRCDNBR(CURSOR)
0013.00
A
01 25'TEST TO CHECK THE BUFFER OVERFLOW'
0014.00
A
05 20'FLD01'
0015.00
A
DSPATR(HI)
****************** End of data **************************************************
d) Create the below Program to demonstrate the session or device error
Columns . . . :
6 80Browse
AMIT/QRPGLESRC
SEU==>
REC9999RPG
FMT FX FFilename++IPEASF.....L.....A.Device+.Keywords+++++++++++++++++++++++++++++
*************** Beginning of data ****************************************************
0001.00 FREC11000PFUF A E
K DISK
0002.00 FREC9999DSPCF
E
WORKSTN SFILE(RECSFL:RRN)
0003.00 DI
S
5 0
0004.00 DRRN
S
5 0
0005.00 C
EVAL
RCDNBR=9999
0006.00 C
DOW
*IN03=*OFF
0007.00 C
03
LEAVE
0008.00 C
EXSR
CLRSFL
0009.00 C
EXSR
FILSFL
0010.00 C
EXSR
DSPSFL
0011.00 C
ENDDO
0012.00 C
SETON
LR
0013.00 *
0014.00 C
CLRSFL
BEGSR
0015.00 C
SETON
40
0016.00 C
WRITE
RECCTL
0017.00 C
SETOFF
40
0018.00 C
ENDSR
0019.00 *
0020.00 C
FILSFL
BEGSR

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0021.00 C
FOR
I=0001 BY 1 TO 9999
0022.00 C
EVAL
RRN=RRN+1
0023.00 C
EVAL
S_FLD01=I
0024.00 C
WRITE
RECSFL
0025.00 C
ENDFOR
0026.00 C
ENDSR
0027.00 *
0028.00 C
DSPSFL
BEGSR
0029.00 C
SETON
4142
0030.00 C
EXFMT
RECCTL
0031.00 C
SETOFF
4142
0032.00 C
ENDSR
****************** End of data *******************************************************
OUTPUT
First loop of the program leads to below output.
TEST TO CHECK THE BUFFER OVERFLOW
FLD01
9991
9992
9993
9994
9995
9996
9997
9998
9999
More...
Now we press Enter and the DOW LOOP runs second time to produce Session or device error.
Because the 2nd time value of RRN starts from 9999 as an initial value and when incremented
by 1 leads to the below error.
Display Program Messages
Session or device error occurred in file REC9999DSP (C G D F).

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