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VSE DTFDA MVS DCB DSORG=DA
BLKSIZE = nnnn BLKSIZE = nnnn
DEVICE = nnnn UNIT = (in DD statement)
ERRBYTE = xxxxxxxx (See description of SYNAD routine)
IOAREA1 = xxxxxxxx Area address (READ/WRITE macro)
SEEKADR = xxxxxxxx Not required (READ/WRITE macro)
TYPEFLE = xxxxxx OPEN macro option
AFTER = YES MACRF = (..WA..)
DEVADDR = SYSnnn UNIT = (in DD statement)
ERREXT = YES SYNAD = xxxxxxxx
HOLD = YES This function can be implemented by using
the ENQ/DEQ logic of MVS for a specific
resource or by requesting exclusive con-
trol of a data block thru MACRF = (..X..)
IDLOC = xxxxxxxx (See description of updating the file)
KEYARG = xxxxxx Keyaddress (READ/WRITE macro)
KEYLEN = nnn KEYLEN = nnn
LABADDR = xxxxxxxx EXLST = xxxxxxxx
READID = YES MACRF = (..RI..)
READKEY = YES MACRF = (..RK..)
WRITEID= YES MACRF = (..WI..)
WRITEKY = YES MACRF = (..WK..)
RECFORM= xxxxxx RECFM = xxx
RECSIZE = (nn) Length (READ/WRITE macro)
or DCB LRECL = nnnnn
RELTYPE = xxx OPTCD = (...,R...).No equivalent for DEC
SEPASMB = YES User must code the DCB
SRCHM = YES LIMCT= n,OPTCD = E
TRLBL = YES EXLST = xxxxxxxx
VERIFY = YES OPTCD = W
XTNTXIT = xxxxxxxx EXLST= xxxxxxxx
Figure 40. Comparison of DTFDA and DCB Macros
Error Bytes
The error bytes used in VSE to test for successful completion of an I/O operation
are equivalent to a two-byte exception code in MVS. The two-byte exception
code is placed in the DECB (DECB+1) of the corresponding READ/WRITE macro
after a WAIT or CHECK macro has been issued.
If you issue a WAIT macro (WAITF in VSE), test for successful I/O completion
provide the appropriate actions.
In MVS, if you issue the CHECK macro, the system performs the test. If an
unusual condition occurs, the system branches to your SYSNAD routine if you
have provided one, or it abnormally terminates the job step.
The information provided in the two bytes is different in VSE and MVS. Therefore
change any parts of your programs that refer to these error bytes. Figure 41 on
page 313 gives a comparison of the VSE and MVS exception codes.
312 VSE to OS/390 Migration Workbook