IBM OS/390 manual Read Macro, Write Macro, Check Macro

ACC Specifies that the problem program accepts the block causing the error. This action can be specified when a data set is opened for INPUT, RDBACK, UPDAT, or OUTPUT (OUTPUT applies to printer data sets only).

SKP Specifies that the block that caused the error is skipped. Specifying SKP also causes the buffer associated with the data block to be released. This function can be specified when a data set is opened for INPUT, RDBACK, or UPDAT.

ABE Specifies that the error results in the abnormal termination of the task. This action can be specified when the data set is opened for INPUT, OUTPUT, RDBACK, or UPDAT.

If you omit the EROPT operand, the ABE action is assumed.

READ Macro

		filename ,SQ,	area length
VSE	READ	(1)	(0)	(r1)
				S
		decbname,SF,	dcbaddress	,	area address ,
MVS	READ		(2-12)		(2-12)
			length
			(2-12)
			′ S′

Notes:

1.If the OPEN macro specifies UPDAT, you must use the execute form of the READ macro.

2.You must test the input operation for completion by using the CHECK macro instruction.

WRITE Macro

VSE	WRITE	filename ,	UPDATE ,	area	,	length
		(1)	SQ	(0)		(r)
MVS	WRITE	decbname,SF,	dcbaddress	area	address		length
			(2-12)	, (2-12)			, (2-12)
							′ S′

Notes:

1.If the OPEN macro specifies UPDAT, you must use the execute form of

WRITE.

2.You must test the output operation for completion by using the CHECK macro.

CHECK Macro

VSE	CHECK	filename	control-address
		(1)	,	(0)
MVS	CHECK	decbaddress		,DSORG= IS
		(1-12)		ALL

Chapter 13. A s s e m b l e r 307