IBM OS/390 User Manual

QSAM

INPUT

,REREAD

OUTPUT

,LEAVE

UPDAT

,DISP

EXTEND
INPUT
EXTEND
OUTPUT

,REREAD

BSAM

INOUT

,DISP

UPDAT

,LEAVE

OUTIN
OUTINX

Any number of dcbaddresses and associated options may be specified in

the OPEN macro instruction.

 1. Options

REREAD
LEAVE
FREE
DISP

 2. If you omit the option, the following positioning occurs:

If you code TYPE=T, LEAVE is assumed (BSAM only).
If you don

′

t code TYPE=T, DISP is assumed (BSAM only).

 3. You can code CLOSE with T Y P E = T to temporarily close sequential data sets

on direct access volumes processed with BSAM. When you use TYPE=T, the
DCB used to process the data set maintains its open status, and you don

′

t

have to issue another OPEN macro to continue processing the same data
set. A request to temporarily close a data set causes MVS to process labels,
modify some of the fields in the system control blocks for that data set, and
reposition the volume (or current volume in the case of multivolume data
sets) in much the same way that the normal CLOSE macro does. When you
code TYPE=T, you can specify that the volume either be positioned at the
end of data (the LEAVE option) or be repositioned at the beginning of data
(the REREAD option). When a DCB is shared among multiple tasks, the task
that opened the data set must also close it; however, a subtask of the task
that opened the DCB can issue the CLOSE macro with the TYPE=T option.

VSE

CLOSE(R)

 filename ,777

(r1) 

MVS

CLOSE

dcbaddress option ,... ,TYPE=T

(2-12)

VSE

GET
PUT

filename

,workname

(1)

(0)

Chapter 13. A s s e m b l e r