IBM System/360 System Programmer's Guide

If'Bits 0 and 5 of OFLGS are both off when EOV is executed, the tape
is spaced past a tape rrark, ana standard latels, if present, are
verified on both the old and new volumes. The direction of spacing
depends on Bit 1. If Bit 1 is off, the tape is spaced forward; if Bit 1
is on, the tape is backspaced.
If Bit 0 is on when EOV is executed, a tape roark is written
immediately following the last data record of the data set, standard
labels, if specified, are created on the old and the new volurre.
When issuing EOV for sequentially organized output data sets on
direct-access volumes, you can determine whether additional space has
been obtained on the same or a different volume. You do this by
checking the volume serial number in the unit control block (UCB) both
before and after issuing EOV.
The only parameter of the EOV macro-instruction is:
dcb-addrx
specifies the address of the data control block that is opened for
the data set. If this pararoeter is specified as (1), register 1
must contain this address.
CLOSE -- Restore Data Control Block
The CLOSE macro-instruction restores one or rrore data control blocks
so that processing of their associated data sets can be terminated. You
must issue CLOSE for all data control blocks that were used by your
channel programs. Some of the procedures performed when CLOSE is
executed are:
• Release of data extent block (DEB).
• Removal of information transferred to data control block fields when
OPEN was executed.
• Verification or creation of standard latels.
• Volume disposition.
• Release of programmer-written appendage routines.
The two parameters of the CLOSE macro-instruction are:
dcb-addr
opt
92
specifies the address of the data control block to be restored.
More than one data control block rray te specified.
specifies the type of volume disposition intended for the data set.
You may specify this parameter as either LEAVE or REREAD. The
corresponding volume disposition when CLOSE is executed is as
follows:
LEAVE Volume is positioned at logical end of data set.
REREAD - Volume is positioned at logical beginning of data set.
DISP
- The disposition indicated on the DD statement is tested,
and appropriate positioning is provided. This service is
assumed if this operand is omitted and volume positioning
is applicable. If there is no disposition specified in
the DD statement when this operand is specified, LEAVE is
assumed.
This parameter is ignored if specified for volumes other than
magnetic tape or direct-access.

IBM System/360 Specifications

General

Brand	IBM
Model	System/360
Category	Desktop
Language	English