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data set name and the password must be left-justified in their areas and
any
unused bytes filled with blanks (X'40').
The password assigned may
be from one to eight alphameric characters.
The operating system increments the binary counter by one
each
time
the
data
set is successfully opened (except for performance of SCRATCH
or RENAME functions on the data set).
When you originate
the
password
record,
the
value
in
the counter may be set at zero (X'OOOO') or any
starting value your installation desires.
The protection mode indicator is set to indicate that the data set is
to be read-only, or that it
may
be
read
or
written.
You
set
the
indicator as follows:
• To zero (X'OO') if the data set is to be read-only •
• To one (X'Ol') if the data set may be read or written.
You may use the 77-byte logging field to record any information about
the
data
set under protection that your installation may desire, e.g.,
date of counter reset, previous password used with this data set, etc.
PROTECTING THE PASSWORD DATA SET
You protect the PASSWORD data
set
itself
by
creating
a
password
record
for
it
when
your
program
initially
builds
the
data
set.
Thereafter, the PASSWORD data
set
cannot
be
opened
(except
by
the
operating
system
routines
that scan the data set) unless the operator
enters the password.
CREATING PROTECTED DATA SETS
A data definit:ion
(DD)
statement
parameter
(LABEL=)
is
used
to
indicate
that
a
data
set
is to be placed under protection.
You may
create a data set:, and
set
the
protection
indicator
in
its
label,
without
entering
a
password
record
for it in the PASSWORD data set.
However, once the data set is closed, any subsequent opening results
in
termination
of
the program attempting to open the data set, unless the
password record is available and the operator can honor the request
for
the
password.
Operating
procedures
at your installation must ensure
that password records for all data sets currently under
protection
are
entered in the PASSWORD data set.
PROTECTION FEATURE OPERATING CHARACTERISTICS
This
section
provides informaticn concerning actions of the protec-
tion feature in relation to termination of processing, volume switching,
data set
concatE~nation,
SCRATCH
and
RENAME
functions,
and
counter
maintenance.
Termination of Processing
Processing is terminated when:
1.
The
operator
cannot supply the correct password for the protected
data set being opened.
2.
A password l:ecord does not exist in the PASSWORD data set
for
the
protected data set being opened.
3.
The
protection
mode indicator setting in the password record, and
the method of I/O processing specified in the open routine
do
not
Implementing Data Set Protection
113
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