HP OpenVMS DCL Dictionary

CREATE/MAILBOX (Alpha/I64 Only)

Creates a virtual mailbox named MBAn and assigns an I/O channel number to it. The /MAILBOX qualifier is required.

Note
The following privileges are required:

TMPMBX (temporary mailbox) to create a temporary mailbox (which is the default)
CMEXEC (change mode to executive) to create a temporary mailbox (which is the default). Note: This requirement is temporary and will be removed in a future release.
PRMMBX (permanent mailbox) to create a permanent mailbox (using the /PERMANENT qualifier)
SYSNAM (system logical name) to place a logical name for a mailbox in the system logical name table
GRPNAM (group logical name) to place a logical name for a mailbox in the group logical name table

To delete a mailbox, use the DELETE/MAILBOX command.

Format

CREATE/MAILBOX logical-name

Parameter

logical-name
Specifies a logical name for the new mailbox. The system creates the mailbox and sets the logical name to point to it.

Description

The CREATE/MAILBOX command creates a virtual mailbox.

Qualifiers

/BUFFER_SIZE=n
Specifies the number of bytes of system dynamic memory that can be used to buffer messages sent to the mailbox. If you do not specify /BUFFER_SIZE or specify it as 0, the operating system provides a default value from the DEFMBXBUFQUO system parameter.
/LOG

/NOLOG (default)
Displays the name of the new mailbox when it is created.
/MESSAGE_SIZE=n
Specifies the maximum size (in bytes) of a message that can be sent to the mailbox. The maximum value is 65535. If you do not specify /MESSAGE_SIZE or specify the value as 0, the operating system provides a default value from the DEFMBXMXMSG system parameter.
/PERMANENT
Specifies that the mailbox is to be permanent. By default, mailboxes are temporary.
/PROTECTION=(ownership[:access][,...])
Specifies protection for the mailbox.

Specify the ownership parameter as system (S), owner (O), group (G), or world (W).
Specify the access parameter as read (R), write (W), logical I/O (L), or physical I/O (P).

If no protection is specified, the mailbox template is used.
For more information about specifying protection codes, see the HP OpenVMS Guide to System Security.
/TEMPORARY (default)
Specifies that the mailbox is temporary. By default, mailboxes are temporary unless you specify /PERMANENT.

Example


$CREATE/MAILBOX/PERMANENT/MESSAGE_SIZE=512/LOG MY_MAILBOX %CREATE-I-CREATED, MBA38: created $SHOW DEVICE MBA38/FULL Device MBA38:, device type local memory mailbox, is online, record-oriented device, shareable, mailbox device. Error count 0 Operations completed 0 Owner process "" Owner UIC [SYSTEM] Owner process ID 00000000 Dev Prot S:RWPL,O:RWPL,G:RWPL,W:RWPL Reference count 0 Default buffer size 512

$CREATE/MAILBOX/PERMANENT/MESSAGE_SIZE=512/LOG MY_MAILBOX
%CREATE-I-CREATED, MBA38: created
$SHOW DEVICE MBA38/FULL
Device MBA38:, device type local memory mailbox, is online,
    record-oriented device, shareable, mailbox device.
 Error count              0  Operations completed                0
 Owner process           ""  Owner UIC                    [SYSTEM]
 Owner process ID  00000000  Dev Prot  S:RWPL,O:RWPL,G:RWPL,W:RWPL
 Reference count          0  Default buffer size               512

In this example, a permanent mailbox is created with the logical name MY_MAILBOX. The SHOW DEVICE command displays the full characteristics of the mailbox.

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