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OpenVMS User's Manual
11.9.1 Process Logical Name Directory
The process-private logical names that are created in the process
logical name directory table, LNM$PROCESS_DIRECTORY, when you log in
are shown in Table 11-2.
Table 11-2 Default Logical Names in Process Logical Name Directory
| Name |
Description |
|
LNM$GROUP
|
Group logical name defined as LNM$GROUP_
gggggg, where
gggggg represents your group number. LNM$GROUP_
gggggg
1
is the logical name table used by your UIC group. The table LNM$GROUP_
gggggg is cataloged in the system directory table. Therefore,
LNM$GROUP is a logical name that translates iteratively to the name of
your group logical name table.
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|
LNM$JOB
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Job logical name that is defined as LNM$JOB_
xxxxxxxx, where
xxxxxxxx
2 represents a number unique to your job tree. LNM$JOB_
xxxxxxxx is the logical name table used by your job. The table
LNM$JOB_
xxxxxxxx is cataloged in the system directory table.
Therefore, LNM$JOB is a logical name that translates iteratively to the
name of your job logical name table.
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LNM$PROCESS
|
Process logical name that translates iteratively to LNM$PROCESS_TABLE,
which is the name of your process logical name table.
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LNM$PROCESS_DIRECTORY
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Name of your process directory logical name table.
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1The string gggggg represents a six-digit octal
number containing the process's UIC group number.
2The string xxxxxxxx represents an eight-digit
hexadecimal number that is the address of the job information block.
11.9.2 Process Logical Name Table
Every process on the system has a process logical name table named
LNM$PROCESS_TABLE. The names in your process table are available only
to your process and any subsequent subprocesses. When you log in, the
system creates logical names for your process and places them in your
process table.
You can reference LNM$PROCESS_TABLE indirectly through the name
LNM$PROCESS. This indirect reference enables you to redefine
LNM$PROCESS as multiple equivalence names and thus include one or more
of your own tables in it, as shown in the following example:
$CREATE/NAME_TABLE APPLICATION_NAMES
$DEFINE/TAB=LNM$PROCESS_DIRECTORY LNM$PROCESS APPLICATION_NAMES,
LNM$PROCESS_TABLE
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By default, the process table contains the logical names shown in
Table 11-3. Note that the logical names SYS$INPUT, SYS$OUTPUT,
SYS$ERROR, and SYS$COMMAND refer to process-permanent files (files that
remain open for the life of the process). For more information about
process-permanent files, see Section 11.13.
Table 11-3 Default Logical Names in Process Logical Name Table
| Name |
Description |
|
SYS$COMMAND
|
The initial file (usually your terminal) from which DCL reads input. A
file from which DCL reads input is called an input stream. The command
interpreter uses SYS$COMMAND to "remember" the original input
stream.
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|
SYS$DISK
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The default device established at login or changed by the SET DEFAULT
command.
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SYS$ERROR
|
The default device or file to which DCL writes system error messages
generated by warnings, errors, and severe errors.
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SYS$INPUT
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The default file from which DCL reads input.
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SYS$NET
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The source process that invokes a target process in DECnet for OpenVMS
task-to-task communication. When opened by the target process, SYS$NET
represents the logical link over which that process can exchange data
with its partner. SYS$NET is defined only during task-to-task
communication.
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SYS$OUTPUT
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The default file (usually your terminal) to which DCL writes output. A
file to which DCL writes output is called an output stream.
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TT
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The default device name for terminals.
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11.9.3 System Logical Name Directory
The default system logical names contained in the system directory
table, LNM$SYSTEM_DIRECTORY, are shown in Table 11-4.
Table 11-4 Default Logical Names in System Logical Name Directory
| Name |
Description |
|
LNM$CLUSTER
|
Logical name of clusterwide parent table that translates iteratively to
LNM$CLUSTER_TABLE.
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LNM$DCL_LOGICAL
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DCL logical name that is defined as LNM$FILE_DEV. LNM$DCL_LOGICAL
translates iteratively into the list of logical name tables searched
and displayed by the SHOW LOGICAL command, the SHOW TRANSLATION
command, and the F$TRNLNM lexical function. By default, these commands
search and display the process, job, group, system, and clusterwide
system logical name tables, in that order.
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LNM$DIRECTORIES
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Directory logical name that is defined as LNM$PROCESS_DIRECTORY and
LNM$SYSTEM_DIRECTORY.
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LNM$FILE_DEV
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Logical name for the search list that is defined as the list of logical
name tables searched by the system when processing a file
specification. Defined as LNM$PROCESS, LNM$JOB, LNM$GROUP, and
LNM$SYSTEM, the system searches the process, job, group, system, and
clusterwide system logical name tables, in that order.
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LNM$GROUP
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Group logical name that is defined for your group table, LNM$GROUP_
gggggg.
1
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LNM$JOB
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Job logical name that is defined as LNM$JOB_
xxxxxxxx.
2
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LNM$PERMANENT_MAILBOX
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Permanent mailbox logical name that is defined as LNM$SYSTEM. Logical
names associated with permanent mailboxes are entered in the logical
name table to which the logical name LNM$PERMANENT_MAILBOX iteratively
translates.
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LNM$SYSCLUSTER
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Logical name for the clusterwide system logical name table that
translates iteratively to LNM$SYSCLUSTER_TABLE.
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LNM$SYSTEM
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System logical name table name that translates iteratively to
LNM$SYSTEM_TABLE, LNM$SYSCLUSTER.
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LNM$TEMPORARY_MAILBOX
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Temporary mailbox logical name that is defined as LNM$JOB. Logical
names associated with temporary mailboxes are entered in the logical
name table to which the logical name LNM$TEMPORARY_MAILBOX iteratively
translates.
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1The string gggggg represents a six-digit octal
number containing the process's UIC group number.
2The string xxxxxxxx represents an eight-digit
hexadecimal number that is the address of the job information block.
11.9.4 Shareable Logical Name Tables
This section describes the default shareable logical name tables:
- Clusterwide system table
- Clusterwide parent table
- Group table
- Job table
- System table
Clusterwide System Table, LNM$SYSCLUSTER_TABLE
LNM$SYSCLUSTER_TABLE is the name of the clusterwide system logical name
table. This table contains logical names that are available to all
users of the cluster.
You can reference LNM$SYSCLUSTER_TABLE indirectly through the name
LNM$SYSCLUSTER. An indirect reference allows you to redefine
LNM$SYSCLUSTER as multiple equivalence names and thus include your own
tables in it.
Clusterwide Parent Table, LNM$CLUSTER_TABLE
LNM$CLUSTER_TABLE is the parent table for all clusterwide logical name
tables, including LNM$SYSCLUSTER_TABLE. Use the logical name
LNM$CLUSTER to refer to it.
Group Table, LNM$GROUP_gggggg
The name for your group table is LNM$GROUP_gggggg
(gggggg represents your user identification code [UIC] group
number). The names in this table are available to all users with the
same UIC group number. Every group on the system has a corresponding
group logical name table.
You can reference LNM$GROUP_gggggg indirectly through the name
LNM$GROUP. An indirect reference allows you to redefine
LNM$GROUP_gggggg as multiple equivalence names and thus
include your own tables in it. It also eliminates the need to remember
your UIC group number and ensures that you are using the most recently
defined table.
Job Table, LNM$JOB_xxxxxxxx
The name for your job table is LNM$JOB_xxxxxxxx
(xxxxxxxx represents the job information block [JIB] address
defined by the system for your job tree).
Your job table contains logical names that are available to all
processes in your job tree---your process and any of your subprocesses.
There is one job table for each job tree in the system. A job table is
shareable so that all processes in a job tree can access it.
You can reference LNM$JOB_xxxxxxxx indirectly through the name
LNM$JOB. This indirect reference allows you to redefine LNM$JOB as
multiple equivalence names and thus include your own tables in it.
Furthermore, by using LNM$JOB, you do not have to locate the JIB
address, and you can be sure that you are using the most recently
defined job table.
The system places logical names created for mounted disks, mounted
tapes, and temporary mailboxes in the job logical name table. In
addition, the system creates the following logical names:
- SYS$LOGIN
Your default device and directory when you log in.
- SYS$LOGIN_DEVICE
Your default device when you log in.
- SYS$REM_ID
For jobs initiated through a DECnet for OpenVMS network
connection, the identification of the process on the remote node from
which the job was originated. On an OpenVMS operating system, if proxy
logins are enabled, this identification is the process's user name; if
proxy logins are not enabled, this is the process identification (PID)
number.
(Proxy logins to proxy accounts allow users to access files across the
network without specifying an access control string.)
- SYS$REM_NODE
For jobs initiated through a DECnet for OpenVMS network
connection, the name of the remote node from which the job was
originated.
- SYS$SCRATCH
Default device and directory to which temporary files are written.
System Table, LNM$SYSTEM_TABLE
The name of the system table is LNM$SYSTEM_TABLE. The system table
contains logical names that are available to all users of the system at
the system level.
The system table is usually referred to indirectly through LNM$SYSTEM,
which is defined as the search list LNM$SYSTEM_TABLE, LNM$SYSCLUSTER.
Use the name LNM$SYSTEM to include system names local to this node and
system names common to all nodes on the cluster.
The logical names that are automatically defined in the system table
when the system starts up are shown in Table 11-5.
Table 11-5 Default Logical Names in System Logical Name Table
| Name |
Description |
Default Address |
|
DBG$INPUT
|
Default input stream for the OpenVMS Debugger, equated to SYS$INPUT at
the process level
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Not applicable
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DBG$OUTPUT
|
Default output stream for the OpenVMS Debugger, equated to SYS$OUTPUT
at the process level
|
Not applicable
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SYS$COMMON
|
Device and directory name for the common part of SYS$SYSROOT
|
SYS$SYSDEVICE:[SYS
n.SYSCOMMON.], where
n is the root directory number of your processor
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SYS$ERRORLOG
|
Device and directory name of error log data files
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SYS$SYSROOT:[SYSERR]
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SYS$EXAMPLES
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Device and directory name of system examples
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SYS$SYSROOT:[SYSHLP.EXAMPLES]
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SYS$HELP
|
Device and directory name of system help files
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SYS$SYSROOT:[SYSHLP]
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SYS$INSTRUCTION
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Device and directory name of system instruction data files
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SYS$SYSROOT:[SYSCBI]
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SYS$LIBRARY
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Device and directory name of system libraries
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SYS$SYSROOT:[SYSLIB]
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SYS$LOADABLE_IMAGES
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Device and directory of operating system executive loadable images,
device drivers, and other executive-loaded code
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SYS$SYSROOT:[SYS$LDR]
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SYS$MAINTENANCE
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Device and directory name of system maintenance files
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SYS$SYSROOT:[SYSMAINT]
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SYS$MANAGER
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Device and directory name of system manager files
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SYS$SYSROOT:[SYSMGR]
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SYS$MESSAGE
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Device and directory name of system message files
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SYS$SYSROOT:[SYSMSG]
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SYS$NODE
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Network node name for the local system if DECnet for OpenVMS is active
on the system and you are connected to a network
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Not applicable
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SYS$PROCDMP
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Directory (set by user) into which image dumps are to be written
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No default setting
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SYS$SHARE
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Device and directory name of system shareable images
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SYS$SYSROOT:[SYSLIB]
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SYS$SPECIFIC
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Device and directory name for node-specific part of SYS$SYSDEVICE
|
SYS$SYSDEVICE:[SYS
n.], where
n is the root directory number of your processor
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SYS$STARTUP
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Device and directory name of system startup files
|
A search list that points first to SYS$SYSROOT:[SYS$STARTUP] and then
to SYS$MANAGER
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SYS$SYSDEVICE
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System disk containing system directories
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Usually SYS$DISK
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SYS$SYSROOT
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Device and root directory for system directories
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A search list that points first to SYS$SYSDEVICE:[SYS
n.], where
n is the root directory number of your processor, and then
points to SYS$COMMON
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SYS$SYSTEM
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Device and directory of operating system programs and procedures
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SYS$SYSROOT:[SYSEXE]
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SYS$TEST
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Device and directory name of User Environment Test Package (UETP) files
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SYS$SYSROOT:[SYSTEST]
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SYS$UPDATE
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Device and directory name of system update files
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SYS$SYSROOT:[SYSUPD]
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11.9.5 Default Protection of Shareable Logical Name Tables
The shareable logical name tables provided by the operating system are
created with default protection. The default protection for each type
of shareable logical name table is shown in Table 11-6.
Table 11-6 Default Protection of Shareable Logical Name Tables
| Table Type |
Table Name |
Default Protection |
|
Job Table
|
LNM$JOB_
xxxxxxxx
1
|
SYSTEM=RWCD, OWNER=RWCD, GROUP=NO ACCESS, WORLD=NO ACCESS
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Group Table
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LNM$GROUP_
gggggg
2
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SYSTEM=RWCD, OWNER=R, GROUP=R, WORLD=NO ACCESS
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System Table
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LNM$SYSTEM_TABLE
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SYSTEM=RWC, OWNER=RWC, GROUP=R, WORLD=R
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Clusterwide System Table
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LNM$SYSCLUSTER_TABLE
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SYSTEM=RWC, OWNER=RWC, GROUP=R, WORLD=R
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Clusterwide Parent Table
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LNM$CLUSTER_TABLE
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SYSTEM=RWC, OWNER=RWC, GROUP=R, WORLD=R
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User-Created Table
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User Specified
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SYSTEM=RWCD, OWNER=RWCD, GROUP=NO ACCESS, WORLD=NO ACCESS
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1The string xxxxxxxx represents an eight-digit
hexadecimal number that is the address of the job information block.
2The string gggggg represents a six-digit octal
number containing the process's UIC group number.
11.9.6 Privilege and Access Requirements for Managing Shareable Logical Names
Table 11-7 shows the privileges and access rights that are required
to create, delete, and read (translate) logical names in each type of
shareable logical name table. For more information about privileges,
access types, and access control, see Chapter 10 in this manual.
Table 11-7 Privilege or Access Type Required for Shareable Logical Name Tasks
| Table Where Name Resides |
Table Name |
Task |
Privilege or Access Type Required |
|
Job Table
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LNM$JOB_
xxxxxxxx
1
|
Create or delete logical name
|
WRITE (W) access to the table where the name will be created, or from
where it will be deleted
|
|
|
|
Read (translate) logical name
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READ (R) access to the table where the name resides
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|
Group Table
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LNM$GROUP_
gggggg
2
|
Create or delete logical name
|
WRITE (W) access to the table where the name will be created, or from
where it will be deleted, or GRPNAM privilege
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|
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Read (translate) logical name
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READ (R) access to the table where the name resides
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System Table
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LNM$SYSTEM_TABLE
|
Create or delete logical name
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System UIC group number (between 0 and the value of system parameter
MAXSYSGROUP), or SYSNAM privilege
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|
|
|
Read (translate) logical name
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READ (R) access to the table where the name resides
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Clusterwide System Table
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LNM$SYSCLUSTER_TABLE
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Create or delete logical name
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System UIC group number (between 0 and the value of system parameter
MAXSYSGROUP), or SYSNAM privilege
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|
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|
Read (translate) logical name
|
READ (R) access to the table where the name resides
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Clusterwide Parent Table
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LNM$CLUSTER_TABLE
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Create or delete logical name
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System UIC group number (between 0 and the value of system parameter
MAXSYSGROUP)
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|
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Read (translate) logical name
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READ (R) access to the table where the name resides
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User-created Table
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User Specified
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Create or delete logical name
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WRITE (W) access to the table where the name will be created, or from
where it will be deleted
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Read (translate) logical name
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READ (R) access to the table where the name resides
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1The string xxxxxxxx represents an eight-digit
hexadecimal number that is the address of the job information block.
2The string gggggg represents a six-digit octal
number containing the process's UIC group number.
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