//IEFPROC  EXEC  PGM=IASXWR00[,REGION=nnnnnK,]
//              [PARM=‘cxxxxxxxx[,seprname]]’
//              [PARM=‘cxxxxxxxx[,seprname][,CERTIFY=Y|N]]’

PGM=IASXWR00

The name of the external writer load module. It must be IASXWR00, as shown.

REGION=nnnnnK

This parameter specifies the region size for the external writer program. The value nnnnn is a 1- to 5-digit number that is multiplied by 1K (1024 bytes) to designate the region size. The region size can vary according to the size of buffers and the size of your output writing routine. Insufficient region size will cause the external writer to abend.

[PARM=‘cxxxxxxxx[,seprname][,CERTIFY=Y|N]]’

[PARM=‘cxxxxxxxx[,seprname][]’

Specifies output writer routine characteristics.

c

An alphabetic character, either P (for printer) or C (for card punch), that specifies the control characters for the class of output the output writing routine will process.

xxxxxxxx

From one to eight (no padding required) single-character SYSOUT class names. These characters specify the classes the output writing routine will process and establish the priority for those classes, with the highest priority at the high-order (leftmost) end of the character string.

Note: If the START command includes class name parameters, they override all of the class names coded here. If you do not code class names on the procedure EXEC statement or the START command, then the external writer will wait for a MODIFY command from the operator before processing any output.

seprname

This is the name of the output separator routine to run with the output writing routine. If you omit this subparameter, no output separator pages are produced.

IEFSD094 is the IBM-supplied output separator routine. If you write your own output separator routine, and name it here, put it in SYS1.LINKLIB (or a library concatenated to LINKLIB through a LNKLSTxx member of parmlib).

Note: Do not use CERTIFY as the name of your output separator routine. For your separator routine to be invoked, you must either code its name on this subparameter or name it in the parameters on the START command.

CERTIFY=Y|N

Indicates whether (Y) or not (N) you want to ensure that all data is safely written to the output device. CERTIFY=Y indicates that data will not be lost even if the external writer abnormally terminates, such as would occur if the output data set becomes full.

Note:

1. The use of the certify function increases processing overhead and decreases efficient space utilization by the output data set.
2. If you write your own output writing routine and require the CERTIFY function, you need to modify your code to be similar to that supplied by IBM. Refer to "Using the CERTIFY Function" within section Programming Considerations for the Output Writing Routine for further details.
3. IBM cannot guarantee data set integrity when writing multiple data sets to a PDS/PDSE member even if you specify CERTIFY=Y. See Functions of the Output Writer Routine for further details.