HP OpenVMS Systems Documentation

Returns a specified item of information for a specified device.

Format

F$GETDVI (device-name,item[,pathname])

Return Value

Arguments

device-name

Specifies a physical device name or a logical name equated to a physical device name. Specify the device name as a character string expression.

After the device-name argument is evaluated, the F$GETDVI function examines the first character of the name. If the first character is an underscore (_), the name is considered a physical device name; otherwise, a single level of logical name translation is performed and the equivalence name, if any, is used.

item

Specifies the type of device information to be returned. The item argument must be specified as a character string expression and can be any one of the items listed in Table DCLI-6.

pathname (Alpha/Integrity servers only)

Specifies a path name for a multipath-capable device. Specify the path name as a character string expression.

Check the definitions of the item codes in Table DCLI-6 to see if the pathname argument is used. In general, item codes that return information that can vary by path do use the pathname argument. You can see the paths for a multipath device by using the SHOW DEVICE /FULL command, the SYS$DEVICE_PATH_SCAN system service, or the F$MULTIPATH lexical function.

If the pathname argument is specified, it is validated against the existing paths for the specified device. If the path does not exist, the NOSUCHPATH error is returned --- even if the specified item code does not make use of the pathname argument.

Description

The F$GETDVI lexical function invokes the $GETDVI system service to return a specified item of information for a specified device. You can obtain a list of devices on your current system by using the lexical function F$DEVICE. Unless otherwise stated in the description of the item argument, F$GETDVI returns device information about the local node only.

This lexical function allows a process to obtain information for a device to which the process has not necessarily assigned a channel.

The F$GETDVI function returns information on all items that can be specified with the $GETDVI system service. In addition to the items that the $GETDVI system service allows, the F$GETDVI function allows you to specify the item EXISTS.

Table DCLI-6 lists the items you can specify with the F$GETDVI function, the type of information returned, and the data types of the return values. In addition to the return information listed in Table DCLI-6, the F$GETDVI lexical function returns any error messages generated by the $GETDVI system service.

For more information on the $GETDVI system service and the items you can specify, see the HP OpenVMS System Services Reference Manual.

Table DCLI-6 F$GETDVI Items

Item	Return Type	Information Returned1
ACCESSTIMES_RECORDED (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the volume supports the recording of access times.
ACPPID	String	Ancillary control process (ACP) identification.
ACPTYPE	String	ACP type code, as one of the following strings: F11V1, F11V2, F11V3, F11V4, F11V5, F64, HBS, JNL, MTA, NET, REM, UCX, or ILLEGAL. The ACPTYPE item returns ILLEGAL if: The device is not mounted or is mounted using the /FOREIGN qualifier. The ACPTYPE is not currently defined.
ALL	String	TRUE or FALSE to indicate whether the device is allocated.
ALLDEVNAM	String	Allocation class device name.
ALLOCLASS	Longword integer between 0 and 255	Allocation class of the host.
ALT_HOST_AVAIL	String	TRUE or FALSE to indicate whether the host serving the alternate path is available.
ALT_HOST_NAME	String	Name of the host serving the alternate path.
ALT_HOST_TYPE	String	Hardware type of the host serving the alternate path.
AVAILABLE_PATH_COUNT (Alpha/Integrity servers only)	Integer	Number of available, working paths for a multipath-capable device.
AVL	String	TRUE or FALSE to indicate whether the device is available for use.
CCL	String	TRUE or FALSE to indicate whether the device is a carriage control device.
CLUSTER	Integer	Volume cluster size.
CONCEALED	String	TRUE or FALSE to indicate whether the logical device name translates to a concealed device.
CYLINDERS	Integer	Number of cylinders on the volume (disks only).
DEVBUFSIZ	Integer	Device buffer size.
DEVCHAR	Integer	Device characteristics.
DEVCHAR2	Integer	Additional device characteristics.
DEVCLASS	Integer	Device class. See the Examples section to determine the device class values returned on your system.
DEVDEPEND	Integer	Device-dependent information.
DEVDEPEND2	Integer	Additional device-dependent information.
DEVICE_MAX_IO_SIZE (Alpha and Integrity servers only)	Integer	The maximum unsegmented transfer size supported by the device's device driver. Although this value is the absolute maximum size supported by the device driver, other software layers (RMS and XFC, for example) might impose lower maximum values, thereby limiting the maximum transfer size.
DEVICE_TYPE_NAME	String	Device type name. Note that if the device is a SCSI tape or disk, the device type name is retrieved directly from the device.
DEVLOCKNAM	String	A unique lock name for the device.
DEVNAM	String	Device name.
DEVSTS	Integer	Device-dependent status information.
DEVTYPE	Integer	Device type. See the Examples section to determine the device type values returned on your system.
DFS_ACCESS	String	TRUE or FALSE to indicate whether the device is a virtual disk connected to a remote Distributed File System (DFS) server.
DIR	String	TRUE or FALSE to indicate whether the device is directory structured.
DMT	String	TRUE or FALSE to indicate whether the device is marked for dismount.
DUA	String	TRUE or FALSE to indicate whether the device is a generic device.
ELG	String	TRUE or FALSE to indicate whether the device has error logging enabled.
ERASE_ON_DELETE (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether disk blocks are zeroed upon file deletion on the volume.
ERRCNT	Integer	Error count of the device. If the error count has been reset with the SET DEVICE /RESET=ERRCNT command, you can use the SHOW DEVICE/FULL command to display the date and time that the error count was reset. If the pathname parameter is specified, only the error count for that path is returned. If the pathname parameter is omitted, the summation of the error counts for all paths in a multipath device is returned.
ERROR_RESET_TIME (Alpha/Integrity servers only)	String	Time at which the error count was reset.
EXISTS	String	TRUE or FALSE to indicate whether the device exists on the system.
EXPSIZE (Alpha/Integrity servers only)	Integer	Current expansion limit on the volume.
FC_HBA_FIRMWARE_REV (Alpha/Integrity servers only)	String	Firmware revision information of a Fibre Channel host bus adapter. A null string is returned for all other devices.
FC_NODE_NAME (Alpha/Integrity servers only)	String	The Fibre Channel host bus adapter node name.
FC_PORT_NAME (Alpha/Integrity servers only)	String	The Fibre Channel host bus adapter port name.
FOD	String	TRUE or FALSE to indicate whether the device is a files-oriented device.
FOR	String	TRUE or FALSE to indicate whether the device is mounted using the /FOREIGN qualifier.
FREEBLOCKS	Integer	Number of free blocks on the volume (disks only).
FULLDEVNAM	String	Fully qualified device name.
GEN	String	TRUE or FALSE to indicate whether the device is a generic device.
HARDLINKS_SUPPORTED (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether hardlinks, rather than aliases, are supported on the volume.
HOST_AVAIL	String	TRUE or FALSE to indicate whether the host serving the primary path is available.
HOST_COUNT	Integer	Number of hosts that make the device available to other nodes in the OpenVMS Cluster.
HOST_NAME	String	Name of the host serving the primary path.
HOST_TYPE	String	Hardware type of the host serving the primary path.
IDV	String	TRUE or FALSE to indicate whether the device is capable of providing input.
LAN_ALL_MULTICAST_MODE (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the device is enabled to receive all multicast packets rather than only packets addressed to enabled multicast addresses.
LAN_AUTONEG_ENABLED (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the device is set to autonegotiate the speed and duplex settings.
LAN_DEFAULT_MAC_ADDRESS (Alpha/Integrity servers only)	String	The default MAC (media access control) address of the device.
LAN_FULL_DUPLEX (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the device is operating in full-duplex mode.
LAN_JUMBO_FRAMES_ENABLED (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether jumbo frames are enabled on the device.
LAN_LINK_STATE_VALID (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether or not the device driver for the LAN device correctly maintains the link status. The device drivers for the following devices do not maintain the link status: DEMNA, any TURBOchannel adapter, any PCMPIA Ring adapter, Galaxy shared memory, TGEC, DE205, DE422, DE425, DE434, DE435, DE500 (the -XA and -AA variants; only the -BA variant is supported.)
LAN_LINK_UP (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the link is up. This item code is valid only for the template device (that is, unit number 0); this item returns 0 if used with a non-template LAN device. This item is supported only on newer adapters; to determine whether or not a particular device supports LAN_LINK_UP, you must first use F$GETDVI with the item LAN_LINK_STATE_VALID. See that item description for more information. If LAN_LINK_UP is used on an adapter that does not maintain the link status, the returned status will be SS$_UNSUPPORTED.
LAN_MAC_ADDRESS (Alpha/Integrity servers only)	String	The current MAC (media access control) address of the device. For more information about the distinction between the default and current MAC addresses, see the HP OpenVMS System Services Reference Manual.
LAN_PROMISCUOUS_MODE (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the device is enabled to receive all packets, rather than only packets addressed to the MAC addresses and to enabled multicast addresses.
LAN_PROTOCOL_NAME (Alpha/Integrity servers only)	String	The name of the LAN protocol running on the device.
LAN_PROTOCOL_TYPE (Alpha/Integrity servers only)	String	The type of the LAN protocol running on the device.
LAN_SPEED (Alpha/Integrity servers only)	Integer	The speed of the LAN device, in units of megabits per second. Valid values are 4, 10, 16, 100, 1000, and 10000.
LOCKID	Integer	Clusterwide lock identification.
LOGVOLNAM	String	Logical volume name.
MAILBOX_BUFFER_QUOTA (Alpha/Integrity servers only)	Integer	The current mailbox quota as an unsigned integer longword.
MAILBOX_INITIAL_QUOTA (Alpha/Integrity servers only)	Integer	The initial mailbox quota as an unsigned integer longword.
MAXBLOCK	Integer	Number of logical blocks on the volume.
MAXFILES	Integer	Maximum number of files on the volume (disks only).
MBX	String	TRUE or FALSE to indicate whether the device is a mailbox.
MEDIA_ID	Integer	Nondecoded media ID.
MEDIA_NAME	String	Either the name of the disk or the tape type.
MEDIA_TYPE	String	Device name prefix.
MNT	String	TRUE or FALSE to indicate whether the device is mounted.
MOUNT_TIME (Alpha/Integrity servers only)	String	Time at which the volume was mounted. For volumes mounted in a cluster, only the time of the initial mount is recorded; the time of any subsequent mount is not recorded.
MOUNTCNT	Integer	Number of times the volume has been mounted on the local system. The value of MOUNTCNT displayed by the SHOW DEVICE command is the total of all mounts of the volume across all members of the cluster.
MOUNTVER_ELIGIBLE (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the volume is eligible to undergo mount verification. A volume mounted with either the /FOREIGN or /NOMOUNT_VERIFICATION qualifier is not subject to mount verification.
MPDEV_AUTO_PATH_SW_CNT (Alpha/Integrity servers only)	Integer	Number of times a multipath device has automatically switched paths because of an I/O error or as the result of automatically "failing back" to a local path from a remote path once the local path became available.
MPDEV_CURRENT_PATH (Alpha/Integrity servers only)	String	Current path name for multipath devices. If the device is not part of a multipath set, this lexical returns the name of the device path if the class driver for this device supports path names. SYS$DKDRIVER, SYS$DUDRIVER, SYS$MKDRIVER, and SYS$GKDRIVER support path names. Returns a null string if the class driver for the device does not support path names.
MPDEV_MAN_PATH_SW_CNT (Alpha/Integrity servers only)	Integer	Number of times a multipath device has manually switched paths because of a SET DEVICE /PATH /SWITCH command or use of the $SET_DEVICE system service.
MT3_DENSITY	String	Current density of the device (tapes only.)
MT3_SUPPORTED	String	TRUE or FALSE to indicate whether the device supports densities defined in the MT3DEF (for Alpha tapes only.)
MULTIPATH (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the device is a member of a multipath set.
MVSUPMSG (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether mount verification OPCOM messages are currently being suppressed on this device. See the MVSUPMSG_INTVL and MVSUPMSG_NUM system parameters for more information on the suppression of mount verification messages.
NET	String	TRUE or FALSE to indicate whether the device is a network device.
NEXTDEVNAM	String	Device name of the next volume in a volume set (disks only).
NOCACHE_ON_VOLUME (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the volume is mounted with all caching disabled.
NOHIGHWATER (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether high-water marking is disabled on the volume.
NOSHARE_MOUNTED (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the volume is mounted with /NOSHARE.
NOXFCCACHE_ON_VOLUME (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the XFC caching is disabled on the volume.
ODS2_SUBSET0 (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the volume mounted supports only a subset of the ODS-2 file structure.
ODS5 (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the volume is mounted ODS-5.
ODV	String	TRUE or FALSE to indicate whether the device is capable of providing output.
OPCNT	Integer	Operation count of the device. Note that the operation count may have been reset with the SET DEVICE/RESET=OPCNT command. If the pathname parameter is specified, only the operation count for that path is returned. If the pathname parameter is omitted, the summation of the operation counts for all paths in a multipath device is returned.
OPR	String	TRUE or FALSE to indicate whether the device is an operator.
OWNUIC	String	User identification code (UIC) of the device owner.
PATH_AVAILABLE (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the specified path is available. This item code is typically used with the pathname parameter. If the pathname parameter is omitted, information about the current path of the multipath device is returned.
PATH_NOT_RESPONDING (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the specified path is marked as not responding. This item code is typically used with the pathname parameter. If the pathname parameter is omitted, information about the current path of the multipath device is returned.
PATH_POLL_ENABLED (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the specified path is enabled for multipath polling. This item code is typically used with the pathname parameter. If the pathname parameter is omitted, information about the current path of the multipath device is returned.
PATH_SWITCH_FROM_TIME (Alpha/Integrity servers only)	String	Time from which this path was switched, either manually or automatically. This item code is typically used with the pathname parameter. If the pathname parameter is omitted, information about the current path of the multipath device is returned.
PATH_SWITCH_TO_TIME (Alpha/Integrity servers only)	String	Time to which this path was switched, either manually or automatically. This item code is typically used with the pathname parameter. If the pathname parameter is omitted, information about the current path of the multipath device is returned.
PATH_USER_DISABLED (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the specified path has been disabled using the SET DEVICE /PATH /NOENABLE command. This item code is typically used with the pathname parameter. If the pathname parameter is omitted, information about the current path of the multipath device is returned.
PID	String	Process identification number of the device owner.
PREFERRED_CPU	Integer	Return argument is a 32-bit CPU bit mask with a bit set indicating the preferred CPU. A return argument containing a bit mask of zero indicates that no preferred CPU exists, either because Fast Path is disabled or the device is not a Fast Path capable device. The return argument serves as a CPU bit mask input argument to the $PROCESS_AFFINITY system service. The argument can be used to assign an application process to the optimal preferred CPU.
PREFERRED_CPU_BITMAP (Alpha/Integrity servers only)	String	A bitmap string of zeros and, at most, a single 1. The 1 in the bitmask represents the number of the CPU to which the device is affinitized. The length of the string determines by how many CPUs are on the system. If there is no 1 in the bitmap string, then either Fast Path is disabled systemwide, or the device is not Fast Path-capable.
PROT_SUBSYSTEM_ENABLED (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the volume is mounted with protected subsystems enabled.
QLEN (Alpha/Integrity servers only)	Integer	The queue length for the device. This value is the number of I/O requests already in the driver --- not the depth of the I/O pending queue.
RCK	String	TRUE or FALSE to indicate whether the device has read checking enabled.
RCT	String	TRUE or FALSE to indicate whether the disk contains RCT.
REC	String	TRUE or FALSE to indicate whether the device is record oriented.
RECSIZ	Integer	Blocked record size.
REFCNT	Integer	Reference count of processes using the device.
REMOTE_DEVICE	String	TRUE or FALSE to indicate whether the device is a remote device.
RND	String	TRUE or FALSE to indicate whether the device allows random access.
ROOTDEVNAM	String	Device name of the root volume in a volume set (disks only).
RTM	String	TRUE or FALSE to indicate whether the device is a real-time device.
SCSI_DEVICE_FIRMWARE_REV (Alpha/Integrity servers only)	String	Firmware revision number of a SCSI disk or SCSI tape. A null string is returned for any other device.
SDI	String	TRUE or FALSE to indicate whether the device is single-directory structured.
SECTORS	Integer	Number of sectors per track (disks only).
SERIALNUM	Integer	Volume serial number (disks only).
SERVED_DEVICE	String	TRUE or FALSE to indicate whether the device is a served device.
SET_HOST_TERMINAL	String	TRUE or FALSE to indicate whether the device is a remote terminal for a SET HOST session from a remote node.
SHDW_CATCHUP_COPYING	String	TRUE or FALSE to indicate whether the device is a member that is the target of a full copy operation.
SHDW_COPIER_NODE (Alpha/Integrity servers only)	String	The name of the node that is actively performing the copy or merge operation.
SHDW_DEVICE_COUNT (Alpha/Integrity servers only)	Integer	The total number of devices in the virtual unit, including devices being added as copy targets.
SHDW_GENERATION (Alpha/Integrity servers only)	String	The current internal revision number for the virtual unit. This value is subject to change.
SHDW_MASTER	String	TRUE or FALSE to indicate whether the device is a virtual unit.
SHDW_MASTER_MBR (Alpha/Integrity servers only)	String	The name of the master member unit that will be used for merge and copy repair operations and for shadow set recovery operations.
SHDW_MASTER_NAME	String	Device name of the virtual unit that represents the shadow set of which the specified device is a member. F$GETDVI returns a null string ("") if the specified device is not a member, or is itself a virtual unit.
SHDW_MBR_COPY_DONE (Alpha/Integrity servers only)	String	The percent of the copy operation completed on this member unit.
SHDW_MBR_COUNT (Alpha/Integrity servers only)	String	The number of full source members in the virtual unit. Devices being added as copy targets are not full source members.
SHDW_MBR_MERGE_DONE (Alpha/Integrity servers only)	String	The percent of the merge operation completed on this member unit.
SHDW_MBR_READ_COST (Alpha/Integrity servers only)	String	The current value set for the member unit. This value can be modified to use a user-specified value.
SHDW_MEMBER	String	TRUE or FALSE to indicate whether the device is a shadow set member.
SHDW_MERGE_COPYING (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the device is a merge member of the shadow set.
SHDW_MINIMERGE_ENABLE (Alpha/Integrity servers only)	String	A value of TRUE indicates that the virtual unit will undergo a mini-merge, not a full merge, if a system in the cluster crashes.
SHDW_NEXT_MBR_NAME	String	Device name of the next member in the shadow set. If you specify a virtual unit, F$GETDVI returns the device name of a member of the shadow set. If you specify the name of a shadow set member unit with the device name and item arguments, F$GETDVI returns the name of the "next" member unit or a null string if there are no more members. To determine all the members of a shadow set, first specify the virtual unit to F$GETDVI; on subsequent calls, specify the member name returned by the previous F$GETDVI call until it has finished, when it returns a null member name. The device name includes the allocation class if the allocation class is not zero; otherwise it includes the device name of the disk controller.
SHDW_READ_SOURCE (Alpha/Integrity servers only)	String	The name of the member unit that will be used for reads at this time. The unit with the lowest sum total of its queue length and read cost is used. This is a dynamic value.
SHDW_SITE (Alpha/Integrity servers only)	Integer	The site value for the specified device. This value is set by the SET DEVICE or SET SHADOW command.
SHDW_TIMEOUT (Alpha/Integrity servers only)	Integer	The user-specified timeout value set for the device. If the user has not set a value by using the SETSHOSHADOW utility, the value of the SYSGEN parameter SHADOW_MBR_TMO is used for member units and the value of MVTIMEOUT is used for virtual units.
SHR	String	TRUE or FALSE to indicate whether the device is shareable.
SPL	String	TRUE or FALSE to indicate whether the device is being spooled.
SPLDEVNAM	String	Name of the device being spooled.
SQD	String	TRUE or FALSE to indicate whether the device is sequential block-oriented (that is, magnetic tape).
STS	Integer	Status information.
SWL	String	TRUE or FALSE to indicate whether the device is software write-locked.
TOTAL_PATH_COUNT (Alpha/Integrity servers only)	Integer	Number of paths for a multipath-capable device.
TRACKS	Integer	Number of tracks per cylinder (disks only).
TRANSCNT	Integer	Volume transaction count.
TRM	String	TRUE or FALSE to indicate whether the device is a terminal.
TT_ACCPORNAM	String	The terminal server name and port name.
TT_ALTYPEAHD	String	TRUE or FALSE to indicate whether the terminal has an alternate type-ahead buffer (terminals only).
TT_ANSICRT	String	TRUE or FALSE to indicate whether the terminal is an ANSI CRT terminal (terminals only).
TT_APP_KEYPAD	String	TRUE or FALSE to indicate whether the keypad is in applications mode (terminals only).
TT_AUTOBAUD	String	TRUE or FALSE to indicate whether the terminal has automatic baud rate detection (terminals only).
TT_AVO	String	TRUE or FALSE to indicate whether the terminal has a VT100-family terminal display (terminals only).
TT_BLOCK	String	TRUE or FALSE to indicate whether the terminal has block mode capability (terminals only).
TT_BRDCSTMBX	String	TRUE or FALSE to indicate whether the terminal uses mailbox broadcast messages (terminals only).
TT_CHARSET	Integer	A bitmap indicating the coded character set supported by the terminal.
TT_CRFILL	String	TRUE or FALSE to indicate whether the terminal requires fill after a carriage return (terminals only).
TT_CS_HANGUL	String	TRUE or FALSE to indicate whether the terminal supports the DEC Korean coded character set.
TT_CS_HANYU	String	TRUE or FALSE to indicate whether the terminal supports the DEC Hanyu coded character set.
TT_CS_HANZI	String	TRUE or FALSE to indicate whether the terminal supports the DEC Hanzi coded character set.
TT_CS_KANA	String	TRUE or FALSE to indicate whether the terminal supports the DEC Kana coded character set.
TT_CS_KANJI	String	TRUE or FALSE to indicate whether the terminal supports the DEC Kanji coded character set.
TT_CS_THAI	String	TRUE or FALSE to indicate whether the terminal supports the DEC Thai coded character set.
TT_DECCRT	String	TRUE or FALSE to indicate whether the terminal is a DIGITAL CRT terminal (terminals only).
TT_DECCRT2	String	TRUE or FALSE to indicate whether the terminal is a DIGITAL CRT2 terminal (terminals only).
TT_DECCRT3	String	TRUE or FALSE to indicate whether the terminal is a DIGITAL CRT3 terminal (terminals only).
TT_DECCRT4	String	TRUE or FALSE to indicate whether the terminal is a DIGITAL CRT4 terminal (terminals only).
TT_DIALUP	String	TRUE or FALSE to indicate whether the terminal is connected to dialup (terminals only).
TT_DISCONNECT	String	TRUE or FALSE to indicate whether the terminal can be disconnected (terminals only).
TT_DMA	String	TRUE or FALSE to indicate whether the terminal has direct memory access (DMA) mode (terminals only).
TT_DRCS	String	TRUE or FALSE to indicate whether the terminal supports loadable character fonts (terminals only).
TT_EDIT	String	TRUE or FALSE to indicate whether the edit characteristic is set.
TT_EDITING	String	TRUE or FALSE to indicate whether advanced editing is enabled (terminals only).
TT_EIGHTBIT	String	TRUE or FALSE to indicate whether the terminal uses the 8-bit ASCII character set (terminals only).
TT_ESCAPE	String	TRUE or FALSE to indicate whether the terminal generates escape sequences (terminals only).
TT_FALLBACK	String	TRUE or FALSE to indicate whether the terminal uses the multinational fallback option (terminals only).
TT_HALFDUP	String	TRUE or FALSE to indicate whether the terminal is in half-duplex mode (terminals only).
TT_HANGUP	String	TRUE or FALSE to indicate whether the hangup characteristic is set (terminals only).
TT_HOSTSYNC	String	TRUE or FALSE to indicate whether the terminal has host/terminal communication (terminals only).
TT_INSERT	String	TRUE or FALSE to indicate whether insert mode is the default line editing mode (terminals only).
TT_LFFILL	String	TRUE or FALSE to indicate whether the terminal requires fill after a line feed (terminals only).
TT_LOCALECHO	String	TRUE or FALSE to indicate whether the local echo characteristic is set (terminals only).
TT_LOWER	String	TRUE or FALSE to indicate whether the terminal has the lowercase characters set (terminals only).
TT_MBXDSABL	String	TRUE or FALSE to indicate whether mailboxes associated with the terminal will receive unsolicited input notification or input notification (terminals only).
TT_MECHFORM	String	TRUE or FALSE to indicate whether the terminal has mechanical form feed (terminals only).
TT_MECHTAB	String	TRUE or FALSE to indicate whether the terminal has mechanical tabs and is capable of tab expansion (terminals only).
TT_MODEM	String	TRUE or FALSE to indicate whether the terminal is connected to a modem (terminals only).
TT_MODHANGUP	String	TRUE or FALSE to indicate whether the modify hangup characteristic is set (terminals only).
TT_NOBRDCST	String	TRUE or FALSE to indicate whether the terminal will receive broadcast messages (terminals only).
TT_NOECHO	String	TRUE or FALSE to indicate whether the input characters are echoed.
TT_NOTYPEAHD	String	TRUE or FALSE to indicate whether data must be solicited by a read operation.
TT_OPER	String	TRUE or FALSE to indicate whether the terminal is an operator terminal (terminals only).
TT_PAGE	Integer	Terminal page length (terminals only).
TT_PASTHRU	String	TRUE or FALSE to indicate whether PASSALL mode with flow control is available (terminals only).
TT_PHYDEVNAM	String	Physical device name associated with a channel number or virtual terminal.
TT_PRINTER	String	TRUE or FALSE to indicate whether there is a printer port available (terminals only).
TT_READSYNC	String	TRUE or FALSE to indicate whether the terminal has read synchronization (terminals only).
TT_REGIS	String	TRUE or FALSE to indicate whether the terminal has ReGIS graphics (terminals only).
TT_REMOTE	String	TRUE or FALSE to indicate whether the terminal has established modem control (terminals only).
TT_SCOPE	String	TRUE or FALSE to indicate whether the terminal is a video screen display (terminals only).
TT_SECURE	String	TRUE or FALSE to indicate whether the terminal can recognize the secure server (terminals only).
TT_SETSPEED	String	TRUE or FALSE to indicate whether you cannot set the speed on the terminal line (terminals only).
TT_SIXEL	String	TRUE or FALSE to indicate whether the sixel is supported (terminals only).
TT_SYSPWD	String	TRUE or FALSE to indicate whether the system password is enabled for a particular terminal.
TT_TTSYNC	String	TRUE or FALSE to indicate whether there is terminal/host synchronization (terminals only).
TT_WRAP	String	TRUE or FALSE to indicate whether a new line should be inserted if the cursor moves beyond the right margin.
UNIT	Integer	The unit number.
VOLCHAR (Alpha/Integrity servers only)	String	128-bit string (16 bytes) that represents the volume characteristics or capabilities of the mounted device. If a bit is set, the volume is capable of performing the function.
VOLCOUNT	Integer	The count of volumes in a volume set (disks only).
VOLNAM	String	The volume name.
VOLNUMBER	Integer	Number of the current volume in a volume set (disks only).
VOLSETMEM	String	TRUE or FALSE to indicate whether the device is a volume set (disks only).
VOLSIZE (Alpha/Integrity servers only)	Integer	The volume's current logical volume size.
VOLUME_EXTEND_QUANTITY (Alpha/Integrity servers only)	Integer	Number of blocks to be used as the default extension size for all files on the volume.
VOLUME_MOUNT_GROUP (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the volume is mounted /GROUP.
VOLUME_MOUNT_SYS (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the volume is mounted /SYSTEM.
VOLUME_PENDING_WRITE_ERR (Alpha/Integrity servers only)	Integer	The number of pending write errors on the volume.
VOLUME_RETAIN_MAX (Alpha/Integrity servers only)	String	The maximum retention time for the volume, as specified with the DCL command SET VOLUME/RETENTION.
VOLUME_RETAIN_MIN (Alpha/Integrity servers only)	String	The minimum retention time for the volume, as specified with the DCL command SET VOLUME/RETENTION.
VOLUME_SPOOLED_DEV_CNT (Alpha/Integrity servers only)	Integer	The number of devices spooled to the volume.
VOLUME_WINDOW (Alpha/Integrity servers only)	Integer	The default window size for the volume.
VPROT	String	The volume protection mask.
WCK	String	TRUE or FALSE to indicate whether the device has write checking enabled.
WRITETHRU_CACHE_ENABLED (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the volume is mounted with write through caching enabled.
WWID (Alpha/Integrity servers only)	String	Worldwide identifier for a Fibre Channel device.
XFC_DEPOSING (Alpha/Integrity servers only)	String	TRUE or FALSE to indicate whether the XFC volume depose operation is in progress or not.

Examples

$  ERR = F$GETDVI("_DQA0","ERRCNT")
$ SHOW SYMBOL ERR
  ERR = 0  Hex = 00000000 Octal = 000000
 
      

This example shows how to use the F$GETDVI function to return an error count for the device DQA0. You must place quotation marks (" ") around the device name DQA0 and the item ERRCNT because they are string literals.

$  LIBRARY/EXTRACT=$DCDEF/OUTPUT=$DCDEF.TXT SYS$LIBRARY:STARLET.MLB
 
      

This example shows how to create a file, $DCDEF.TXT, containing a list of values for device types and device classes from the STARLET library. The device classes begin with 'DC$', and device types begin with 'DT$'.

Note that most modern SCSI disks and tapes return the generic DEVTYPE code (DT$_GENERIC_DK or DT$_GENERIC_MK), therefore you should use the DEVICE_TYPE_NAME item:

$ X=F$GETDVI("XDELTA$DKA0:","DEVICE_TYPE_NAME") $ SHOW SYMBOL X X = "RZ29B"

$  WRITE SYS$OUTPUT F$GETDVI ( "$1$DGA30", PATH_SWITCH_TO_TIME",
_$  "PGA0.5000-1FE1-0001=5782" )
19-MAY-2006 14:47:41.77
 
      

This example shows the use of the optional path name parameter for F$GETDVI. If a path is not specified, information for the multipath current path is returned. To determine the paths for a multipath device, use the F$MULTIPATH lexical function.