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HP OpenVMS DCL Dictionary
ALLOCATE
Provides your process with exclusive access to a device until you
deallocate the device or terminate your process. Optionally associates
a logical name with the device.
Requires read (R), write (W), or control access.
Format
ALLOCATE device-name[:][,...] [logical-name[:]]
Parameters
device-name[:][,...]
Specifies the name of a physical device or a logical name that
translates to the name of a physical device. The device name can be
generic: if no controller or unit number is specified, any device that
satisfies the specified part of the name is allocated. If more than one
device is specified, the first available device is allocated.
logical-name[:]
Specifies a string of 1 to 255 alphanumeric characters. Enclose the
string in single quotation marks (` ') if it contains blanks. Trailing
colons (:) are not used. The name becomes a process logical name with
the device name as the equivalence name. The logical name remains
defined until it is explicitly deleted or your process terminates.
Qualifiers
/GENERIC
/NOGENERIC (default)
Indicates that the first parameter is a device type rather
than a device name. Example device types are: RX50, RD52,
TK50, RC25, RCF25, and RL02. The first free, nonallocated device of the
specified name and type is allocated.
The /[NO]GENERIC qualifier is placed before the device-name
parameter in the ALLOCATE command line. For example, you can allocate
an RK07 device by entering the following command at the DCL prompt ($):
$ ALLOCATE/GENERIC RK07 DISK
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The following table shows some device types that you can specify with
the /GENERIC qualifier. To see what devices are available, see your SPD
for the OpenVMS version they are currently using.
| Devices by Classification |
| Disk Devices |
|
EF51
|
EF52
|
EF53
|
EF54
|
EF58
|
|
ESE20
|
ESE25
|
ESE52
|
ESE56
|
ESE58
|
|
EZ31
|
EZ31L
|
EZ32
|
EZ32L
|
EZ33
|
|
EZ33L
|
EZ34
|
EZ35
|
EZ51
|
EZ52
|
|
EZ53
|
EZ54
|
EZ56R
|
EZ58
|
HSZ10
|
|
HSZ15
|
HSZ20
|
HSZ40
|
ML11
|
RA60
|
|
RA70
|
RA71
|
RA72
|
RA73
|
RA80
|
|
RA81
|
RA82
|
RA90
|
RA92
|
RAH72
|
|
RB02
|
RB80
|
RC25
|
RCF25
|
RD26
|
|
RD31
|
RD32
|
RD33
|
RD51
|
RD52
|
|
RD53
|
RD54
|
RF30
|
RF31
|
RF31F
|
|
RF32
|
RF35
|
RF36
|
RF37
|
RF70
|
|
RF71
|
RF72
|
RF73
|
RF74
|
RF75
|
|
RFF31
|
RFH31
|
RFH32
|
RFH35
|
RFH72
|
|
RFH73
|
RK06
|
RK07
|
RL01
|
RL02
|
|
RM03
|
RM05
|
RM80
|
RP04
|
RP05
|
|
RP06
|
RP07
|
RP07HT
|
RX01
|
RX02
|
|
RX04
|
RX18
|
RX23
|
RX23S
|
RX26
|
|
RX33
|
RX33S
|
RX35
|
RX50
|
RZ01
|
|
RZ13
|
RZ14
|
RZ15
|
RZ16
|
RZ17
|
|
RZ18
|
RZ22
|
RZ23
|
RZ23L
|
RZ24
|
|
RZ24L
|
RZ25
|
RZ25L
|
RZ26
|
RZ26B
|
|
RZ26L
|
RZ26M
|
RZ27
|
RZ27B
|
RZ27L
|
|
RZ28
|
RZ28B
|
RZ28L
|
RZ29
|
RZ29B
|
|
RZ31
|
RZ34L
|
RZ35
|
RZ35L
|
RZ36
|
|
RZ36L
|
RZ37
|
RZ38
|
RZ55
|
RZ55L
|
|
RZ56
|
RZ56L
|
RZ57
|
RZ57I
|
RZ57L
|
|
RZ58
|
RZ59
|
RZ72
|
RZ73
|
RZ73B
|
|
RZ74
|
RZ74B
|
RZ75
|
RZ75B
|
RZF01
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| Compact Disk Devices |
|
RRD40
|
RRD40S
|
RRD42
|
RRD43
|
RRD44
|
|
RRD50
|
RV20
|
RV60
|
RV80
|
RW504
|
|
RW510
|
RW514
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RW516
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RWZ01
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RWZ21
|
|
RWZ31
|
RWZ51
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RWZ52
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RWZ53
|
RWZ54
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| Tape Devices |
|
TA78
|
TA79
|
TA81
|
TA85
|
TA86
|
|
TA87
|
TA90
|
TA90E
|
TA91
|
TAD85
|
|
TAPE9
|
TD34
|
TD44
|
TE16
|
TF30
|
|
TF70
|
TF85
|
TF86
|
TK50
|
TK50S
|
|
TK60
|
TK70
|
TK70L
|
TKZ09
|
TKZ60
|
|
TL810
|
TL820
|
TLZ04
|
TLZ06
|
TLZ07
|
|
TLZ6
|
TLZ7
|
TM32
|
TS11
|
TSZ05
|
|
TSZ07
|
TSZ08
|
TU45
|
TU56
|
TU58
|
|
TU77
|
TU78
|
TU80
|
TU81
|
TZ30
|
|
TZ30S
|
TZ85
|
TZ857
|
TZ86
|
TZ865
|
|
TZ867
|
TZ87
|
TZ875
|
TZ877
|
TZ88
|
|
TZ885
|
TZ887
|
TZ89
|
TZ895
|
TZ897
|
|
TZK10
|
TZK11
|
TZX0
|
|
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/LOG (default)
/NOLOG
Displays a message indicating the name of the device allocated. If the
operation specifies a logical name that is currently assigned to
another device, then the superseded value is displayed.
Examples
| #1 |
$ ALLOCATE DMB2:
%DCL-I-ALLOC, _DMB2: allocated
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The ALLOCATE command in this example requests the allocation of a
specific RK06/RK07 disk drive, that is, unit 2 on controller B. The
system response indicates that the device was allocated successfully.
| #2 |
$ ALLOCATE MT,MF: TAPE:
%DCL-I-ALLOC, _MTB2: allocated
.
.
.
$ SHOW LOGICAL TAPE:
TAPE: = _MTB2: (process)
$ DEALLOCATE TAPE:
$ DEASSIGN TAPE:
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The ALLOCATE command in this example requests the allocation of a tape
device whose name begins with MT or MF and assigns it the logical name
TAPE. The ALLOCATE command locates an available tape device whose name
begins with MT, and responds with the name of the device allocated. (If
no tape device beginning with MT had been found, the ALLOCATE command
would have searched for a device beginning with MF.) Subsequent
references to the device TAPE in user programs or command strings are
translated to the device name MTB2.
When the tape device is no longer needed, the DEALLOCATE command
deallocates it and the DEASSIGN command deletes the logical name. Note
that the logical name TAPE was specified with a colon on the ALLOCATE
command, but that the logical name table entry does not have a colon.
| #3 |
$ ALLOCATE/GENERIC RL02 WORK
%DCL-I-ALLOC, _DLA1: allocated
%DCL-I-SUPERSEDE, previous value of WORK has been superseded
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The ALLOCATE command in this example requests the allocation of any
RL02 disk device and assigns the logical name WORK to the device. The
completion message identifies the allocated device and indicates that
the assignment of the logical name WORK supersedes a previous
assignment of that name.
| #4 |
$ ALLOCATE $TAPE1
%DCL-I-ALLOC, _MUA0: allocated
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The ALLOCATE command in this example allocates the tape device MUA0,
which is associated with the logical name $TAPE1.
| #5 |
$ ALLOCATE /GENERIC RX50 ACCOUNTS
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The ALLOCATE command in this example allocates the first free diskette
drive and makes its name equivalent to the process logical name
ACCOUNTS.
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