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IBM System/360 System Programmer's Guide

IBM System/360
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Release
of
data
extent
block
(DEB).
Removal
of
information
transferred
to
data
control
block
fields
when
OPEN
was
executed.
Verification
or
creation
of
standard
labels.
Release
of
programmer-written
appendage
routines.
The
only
parameter
of
the
CLOSE
macro-instruction
is
the
address
of
the
data
control
block
to
be
restored.
(More
than
one
data
control
block
may
be
specified.)
THE
XDAP
CONTROL
BLOCK
The
three
portions
of
the
control
block
generated
during
execution
of
the
XDAP
macro-instruction
are
described
here.
Event
Control
Block
(ECB)
The
event
control
block
begins
on
a
full
word
boundary
and
occupies
the
first
4
bytes
of
the
XDAP
control
block.
Each
time
the
direct-
access
channel
program
terminates,
the
input/output
supervisor
places
a
completion
code
containing
status
inforrr.ation
into
the
event
control
block
(Figure
12).
Before
examining
this
information,
you
must
test
for
the
setting
of
the
"Complete
Bit"
by
issuing
a
WAIT
macro-instruction
specifying
the
event
control
block.
r--------------T------------------T------------------------------------,
I
WAIT
Bit=O
I
Complete
Bit=l
I
Remainder
of
Completion
Code
I
L
______________
~
__________________
~
____________________________________
J
o 1 2
31
Figure
12.
Event
Control
Block
After
Posting
of
Completion
Code
WAIT
Bit
A
one
bit
in
this
position
instruction
has
been
issued,
but
program
has
not
been
completed.
indicates
that
the
WAIT
that
the
direct-access
macro-
channel
Corrplete
Bit
A
one
bit
in
this
position
indicates
that
the
channel
program
has
been
completed;
if
it
has
not
been
completed,
a
zero
bit
is
in
this
position.
Completion
Code
102
This
code,
which
includes
the
WAIT
and
Complete
bits,
may
be
one
of
the
following
4-byte
hexadecimal
expressions:
7FOOOOOO
41000000
42000000
44000000
Interpretation
Direct-access
program
has
terminated
without
error.
Direct-access
program
has
permanent
error.
terminated
with
Direct-access
program
has
terminated
because
a
direct-access
extent
address
has
been
violated.
Channel
program
has
been
intercepted
because
of
perrranent
errcr
associated
with
device
end
for
previous
request.
You may
reissue
the
inter-
certed
request.

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IBM System/360 Specifications

General IconGeneral
BrandIBM
ModelSystem/360
CategoryDesktop
LanguageEnglish

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