HP OpenVMS System Services Reference Manual


Previous Contents Index

The device drivers for the following adapters do not maintain the link status: DEMNA, any TURBOchannel adapter, any PCMCIA adapter, any Token Ring adapter, Galaxy shared memory, TGEC, DE205, DE422, DE425, DE434, DE435, DE500-XA. (The -AA and -BA variants are supported.)

DVI$_LAN_LINK_UP

On Alpha and I64 systems, returns an unsigned longword, which is interpreted as Boolean. A value of 1 indicates that 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 against a nontemplate LAN device.

This item is supported only on newer adapters. To determine whether or not a particular LAN device supports DVI$_LAN_LINK_UP, you must first call $GETDVI using the item code DVI$_LAN_LINK_STATE_VALID. For more information, see that item code.

If DVI$_LAN_LINK_UP is used on an adapter that does not maintain the link status, the returned status from $GETDVI will be SS$_UNSUPPORTED. For more information, see DVI$_LAN_LINK_VALID.

DVI$_LAN_MAC_ADDRESS

On Alpha and I64 systems, returns the current MAC address of the device as a string. Note that certain protocols, such as DECnet Phase IV, change the default MAC address to one based on the DECnet address. For DECnet Phase IV, the MAC address is in the form AA-00-04-00-nn-mm, where nn-mm is calculated by multiplying the the DECnet Phase IV area number by 1024, adding the node number (that is, the number following the dot), taking the hexadecimal representation of that sum, and swapping the two bytes.

For example, a node with a DECnet Phase IV address of 3.31 gives a decimal representation of 3103 (the value corresponding to the system parameter SCSSYSTEMID) and a hexadecimal representation of 0C1F. If DECnet Phase IV is started on this system, the MAC address of any LAN adapter on this system running DECnet is AA-00-04-00-1F-0C. < PARAMITEM>(DVI$_LAN_PROMISCUOUS_MODE) On Alpha and I64 systems, returns an unsigned longword, which is interpreted as Boolean. A value of 1 indicates that the device is enabled to receive all packets, not just packets addressed to the MAC address and enabled multicast addresses.

DVI$_LAN_PROTOCOL_NAME

On Alpha and I64 systems, returns the name of the LAN protocol running on the device as a string.

DVI$_LAN_PROTOCOL_TYPE

On Alpha and I64 systems, returns the LAN protocol type running on the device as a string.

DVI$_LAN_SPEED

On Alpha and I64 systems, returns the speed of the LAN device (in Mb/s) as an unsigned longword. Valid values are 4, 10, 16, 100, 1000, and 10000.

DVI$_LOCKID

Returns the lock ID of the lock on a disk as an unsigned longword. The lock manager locks a disk if it is available to all nodes in an OpenVMS Cluster system and it is either allocated or mounted. A disk is available to all nodes in an OpenVMS Cluster system if, for example, it is served by an HSC controller or MSCP server or if it is a dual-ported MASSBUS disk.

DVI$_LOGVOLNAM

Returns the logical name of the volume or volume set as a string.

DVI$_MAILBOX_BUFFER_QUOTA

On Alpha and I64 systems, returns the current mailbox quota as an unsigned integer longword.

DVI$_MAILBOX_INITIAL_QUOTA

On Alpha and I64 systems, returns the initial mailbox quota as an unsigned integer longword.

DVI$_MAXBLOCK

Returns the maximum number of blocks on the volume as an unsigned integer longword. This item code is applicable only to disks.

DVI$_MAXFILES

Returns the maximum number of files on the volume as an unsigned integer longword. This item code is applicable only to disks.

DVI$_MEDIA_ID

Returns the nondecoded media ID as a longword. This item code is applicable only to disks and tapes.

DVI$_MEDIA_NAME

Returns the name of the volume type (for example, RK07 or TA78) as a string. This item code is applicable only to disks and tapes.

DVI$_MEDIA_TYPE

Returns the device name prefix of the volume (for example, DM for an RK07 device or MU for a TA78 device) as a string. This item code is applicable only to disks and tapes.

DVI$_MOUNT_TIME

On Alpha and I64 systems, returns the time at which the volume was mounted. Because the returned time is in the standard 64-bit absolute time format, specify 8 (bytes) for the buffer length field in the item descriptor.

Note that for volumes mounted in a cluster, only the time of the initial mount is recorded; the time of any subsequent mount is not recorded.

DVI$_MOUNTCNT

Returns the mount count for the volume as an unsigned integer longword and displays the 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.

DVI$_MOUNTVER_ELIGIBLE

On Alpha and I64 systems, returns an unsigned longword, which is interpreted as Boolean. A value of 1 indicates 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.

DVI$_MPDEV_AUTO_PATH_SW_CNT

On Alpha and I64 systems, returns as an unsigned longword the number of times a multipath device has automatically switched paths due to an I/O error, or as the result of automatically "failing back" to a local path from a remote path after the local path became available.

DVI$_MPDEV_CURRENT_PATH

On Alpha and I64 systems, returns the current path name for multipath devices as a string.

If the device is not part of a multipath set, $GETDVI will return the name of the device path if the class driver for this device supports path names. SYS$DKDRIVER, SYS$DUDRIVER, SYS$MKDRIVER, and SYS$GKDRIVER support path names.

If the class driver for the device does not support path names, $GETDVI returns a null string.

DVI$_MPDEV_MAN_PATH_SW_CNT

On Alpha and I64 systems, returns as an unsigned longword the number of times a multipath device has manually switched paths due to a $SET DEVICE /PATH /SWITCH command or the use of the $SET_DEVICE system service.

DVI$_MSCP_UNIT_NUMBER

Returns the internal coded value for MSCP unit numbers as a longword integer. This item code is reserved to HP.

DVI$_MT3_DENSITY

Returns the density of the device. Valid for tapes only. This code is an unsigned longword integer.

DVI$_MT3_SUPPORTED

The return value of 1 indicates that the device supports tape density codes defined by MT3DEF. Valid for tapes only. This code is an unsigned longword integer.

DVI$_MULTIPATH

On Alpha and I64 systems, returns a longword, interpreted as Boolean. A value of 1 indicates the device is a member of a multipath set.

DVI$_MVSUPMSG

On Alpha and I64 systems, returns an unsigned longword, interpreted as Boolean. A value of 1 indicates that 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.

DVI$_NEXTDEVNAM

Returns the device name of the next volume in the volume set as a string. The node name is also returned. This item code is applicable only to disks.

DVI$_NOCACHE_ON_VOLUME

On Alpha and I64 systems, returns an unsigned longword, which is interpreted as Boolean. A value of 1 indicates the volume is mounted with all caching disabled

DVI$_NOHIGHWATER

On Alpha and I64 systems, returns an unsigned longword, which is interpreted as Boolean. A value of 1 indicates that high-water marking is disabled on the volume.

DVI$_NOSHARE_MOUNTED

On Alpha and I64 systems, returns an unsigned longword, which is interpreted as Boolean. A value of 1 indicates the volume is mounted /NOSHARE.

DVI$_ODS2_SUBSET0

On Alpha and I64 systems, returns an unsigned longword, which is interpreted as Boolean. A value of 1 indicates the volume supports only a subset of the ODS-2 file structure.

DVI$_ODS5

On Alpha and I64 systems, returns an unsigned longword, which is interpreted as Boolean. A value of 1 indicates the volume is mounted ODS-5.

DVI$_OPCNT

Returns the operation count of the device as an unsigned longword. Note that the operation count might have been reset with the SET DEVICE/RESET=OPCNT command.

On Alpha and I64 systems, this item code can be used with the PATHNAME parameter. If the PATHNAME parameter is omitted, the summation of the operation counts for all paths in a multipath device is returned (which was the behavior prior to the introduction of the PATHNAME parameter). If the PATHNAME parameter is specified, only the operation count for that path is returned.

DVI$_OWNUIC

Returns the user identification code (UIC) of the owner of the device as a standard 4-byte UIC.

DVI$_PATH_AVAILABLE

On Alpha and I64 systems, returns an unsigned longword, interpreted as Boolean. A value of 1 indicates the specified path is available.

This item code is usually used with the PATHNAME parameter. If the PATHNAME parameter is omitted, information about the current path of the multipath device is returned.

DVI$_PATH_NOT_RESPONDING

On Alpha and I64 systems, returns an unsigned longword, interpreted as Boolean. A value of 1 indicates the specified path is marked as not responding.

This item code is usually used with the PATHNAME parameter. If the PATHNAME parameter is omitted, information about the current path of the multipath device is returned.

DVI$_PATH_POLL_ENABLED

On Alpha and I64 systems, returns an unsigned longword, interpreted as Boolean. A value of 1 indicates that the specified path is enabled for multipath polling.

This item code is usually used with the PATHNAME parameter. If the PATHNAME parameter is omitted, information about the current path of the multipath device is returned.

DVI$_PATH_SWITCH_FROM_TIME

On Alpha and I64 systems, returns the time from which this path was switched, either manually or automatically. Because the returned time is in the standard 64-bit absolute time format, specify 8 (bytes) for the buffer length field in the item descriptor.

This item code is usually used with the PATHNAME parameter. If the PATHNAME parameter is omitted, information about the current path of the multipath device is returned.

DVI$_PATH_SWITCH_TO_TIME

On Alpha and I64 systems, returns the time to which this path was switched, either manually or automatically. Because the returned time is in the standard 64-bit absolute time format, specify 8 (bytes) for the buffer length field in the item descriptor.

This item code is usually used with the PATHNAME parameter. If the PATHNAME parameter is omitted, information about the current path of the multipath device is returned.

DVI$_PATH_USER_DISABLED

On Alpha and I64 systems, returns an unsigned longword, interpreted as Boolean. A value of 1 indicates the specified path has been disabled using the $SET DEVICE /PATH /NOENABLE command.

This item code is usually used with the PATHNAME parameter. If the PATHNAME parameter is omitted, information about the current path of the multipath device is returned.

DVI$_PID

Returns the process identification (PID) of the owner of the device as an unsigned integer longword.

DVI$_PREFERRED_CPU

Do not use this item code. The service continues to return the correct data for systems with up to 64 CPUs but fails for systems with more than 64 CPUs. Use item code DVI$_PREFERRED_CPU_BITMAP instead.

DVI$_PREFERRED_CPU_BITMAP

On Alpha and I64 systems, the return argument is a bitmap with a bit 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 bitmap input argument to the $PROCESS_AFFINITY system service. The argument can be used to assign an application process to the optimal preferred CPU.

The size of the returned bitmap is determined by the number of supported CPUs on the system. You can compute the number of bytes needed for the bitmap as follows: Use the $GETSYI system service with an item code of SYI$_MAX_CPUS to find the minimum number of bits needed, round this number up to a multiple of 64, and divide the result by 8.

DVI$_PROT_SUBSYSTEM_ENABLED

On Alpha and I64 systems, returns an unsigned longword, which is interpreted as Boolean. A value of 1 indicates the volume is mounted with protected subsystems enabled.

DVI$_RECSIZ

Returns the blocked record size as an unsigned integer longword.

DVI$_REFCNT

Returns the number of channels assigned to the device as an unsigned integer longword.

DVI$_REMOTE_DEVICE

Returns a longword, which is interpreted as Boolean. A value of 1 indicates that the device is a remote device; a value of 0 indicates that it is not a remote device. A remote device is a device that is not directly connected to the local node, but instead is visible through the OpenVMS Cluster system.

DVI$_ROOTDEVNAM

Returns the device name of the root volume in the volume set as a string. This item code is applicable only to disks.

DVI$_SCSI_DEVICE_FIRMWARE_REV

On Alpha and I64 systems, returns the firmware revision of a SCSI disk or SCSI tape as a four-character string. This item code is valid only for SCSI disks and SCSI tapes; a null string is returned for any other device.

DVI$_SECTORS

Returns the number of sectors per track as an unsigned integer longword. This item code is applicable only to disks.

DVI$_SERIALNUM

Returns the serial number of the volume as an unsigned integer longword. This item code is applicable only to disks.

DVI$_SERVED_DEVICE

Returns a longword, which is interpreted as Boolean. A value of 1 indicates that the device is a served device; a value of 0 indicates that it is not a served device. A served device is one whose local node makes it available to other nodes in the OpenVMS Cluster system.

DVI$_SHDW_CATCHUP_COPYING

Returns a longword, which is interpreted as Boolean. The value 1 indicates that the device is the target of a full copy operation.

DVI$_SHDW_COPIER_NODE

On Alpha and I64 systems, returns the name of the node that is actively performing either the copy or the merge operation, as a string.

DVI$_SHDW_DEVICE_COUNT

On Alpha and I64 systems, returns the total number of devices in the virtual unit, including devices being added as copy targets, as a longword.

DVI$_SHDW_GENERATION

On Alpha and I64 systems, returns the current, internal revision number of the virtual unit, as a quadword.

DVI$_SHDW_MASTER

Returns a longword, which is interpreted as Boolean. The value 1 indicates that the device is a virtual unit named DSAnnnn:.

DVI$_SHDW_MASTER_MBR

On Alpha and I64 systems, returns the name of the master member device (as a string) that is used for merge and copy repair operations and for shadow set recovery operations.

DVI$_SHDW_MASTER_NAME

When the specified device is a shadow set member, $GETDVI returns the device name of the virtual unit (DSAnnnn:) that represents the shadow set of which the specified device is a member. $GETDVI returns a null string if the specified device is not a member or is itself a virtual unit (DSAnnnn:).

Note

Shadow set members must have a nonzero allocation class to operate in an OpenVMS Cluster system. For more information, see HP Volume Shadowing for OpenVMS.

DVI$_SHDW_MBR_COPY_DONE

On Alpha and I64 systems, returns the percentage of the copy operation that is complete on the current member unit, as a longword.

DVI$_SHDW_MBR_COUNT

On Alpha and I64 systems, returns the number of full source members in the virtual unit, as a longword. Devices added as copy targets are not full source members.

DVI$_SHDW_MBR_MERGE_DONE

On Alpha and I64 systems, returns the percentage of the merge operation that has been completed on the member, as a longword.

DVI$_SHDW_MBR_READ_COST

On Alpha and I64 systems, returns the current value set for the member unit, as a longword. This value can be modified to use a customer-specified value.

DVI$_SHDW_MEMBER

Returns a longword, which is interpreted as Boolean. The value 1 indicates that the device is a shadow set member.

DVI$_SHDW_MERGE_COPYING

On Alpha and I64 systems, returns a longword, which is interpreted as Boolean. The value 1 indicates that the device is a merge member of the shadow set.

DVI$_SHDW_MINIMERGE_ENABLE

On Alpha and I64 systems, returns a longword, which is interpreted as Boolean. The value 1 indicates that, if a system in the cluster that has this device mounted crashes, the virtual unit will undergo a minimerge and not a full merge.

DVI$_SHDW_NEXT_MBR_NAME

Returns the device name of the next member in the shadow set. If you specify a virtual unit with the chan or devnam argument, DVI$_SHDW_NEXT_MBR_NAME returns the device name of a member of a shadow set. If you specify the name of a shadow set member unit with the chan or devnam argument, DVI$_SHDW_NEXT_MBR_NAME 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 (DSAnnnn:) to $GETDVI. Then, on subsequent calls, specify the member name returned by the previous $GETDVI call until it returns a null member name.

When the shadow set members have a nonzero allocation class, the device name returned by $GETDVI contains the allocation class; the name has the form $allocation-class$device. For example, if a shadow set has an allocation class of 255 and the device name is DUA42, $GETDVI returns the string $255$DUA42.

Note

Shadow set members must have a nonzero allocation class to operate in an OpenVMS Cluster system. For more information, see HP Volume Shadowing for OpenVMS.

DVI$_SHDW_READ_SOURCE

On Alpha and I64 systems, returns the name of the member device that is used for reads, at this point in time, as a string. DVI$_SHDW_READ_SOURCE uses the unit that has the lowest value of the sum of its queue length and read cost for reads. This is a dynamic value.

DVI$_SHDW_TIMEOUT

On Alpha and I64 systems, returns the customer-specified timeout value set for the device, as a longword.

If you do not set a value using the SETSHOWSHADOW utility, the SYSGEN parameter SHADOW_MBR_TWO is used for member units and MVTIMEOUT is used for virtual units.

DVI$_STS

Returns the device unit status as a 4-byte bit vector. Each bit in the vector, when set, corresponds to a symbolic name that is defined by the $UCBDEF macro. The following table describes each name:
Symbol Description
UCB$V_ALTBSY Unit is busy via alternate startio path.
UCB$V_BSY Unit is busy.
UCB$V_CANCEL I/O on unit is canceled.
UCB$V_CLUTRAN OpenVMS Cluster state transition in progress.
UCB$V_DEADMO Deallocate at dismount.
UCB$V_DELETEUCB Delete this UCB when reference count equals 0.
UCB$V_DISMOUNT Dismount in progress.
UCB$V_ERLOGIP Error log is in progress on unit.
UCB$V_EXFUNC_SUPP Unit supports the EXFUNC bit.
UCB$V_FAST_PATH Unit supports FAST PATH Affinity.
UCB$V_FP_HWINT Unit supports FAST PATH hardware interrupt CPU Affinity.
UCB$V_INT Interrupt is expected.
UCB$V_INTTYPE Receiver interrupt.
UCB$V_IOPOST_LOCAL Unit supports I/O post processing on the current CPU.
UCB$V_LCL_VALID Volume is valid on the local node.
UCB$V_MNTVERIP Mount verification is in progress.
UCB$V_MOUNTING Device is being mounted.
UCB$V_MNTVERPND Mount verification is pending on busy device.
UCB$V_NO_ASSIGN Unit cannot have channels assigned to it.
UCB$V_ONLINE Unit is on line.
UCB$V_PATHVERIP Path verification is in progress for this device.
UCB$V_POWER Power failed while unit busy.
UCB$V_SNAPSHOT Restart validation is in progress.
UCB$V_SUPMVMSG If set, suppress success type mount version messages.
UCB$V_SVPN_END Last byte used from page mapped by system virtual page number (SVPN).
UCB$V_TEMPLATE Template UCB from which other UCBs for this device type are made.
UCB$V_TIM Timeout is enabled.
UCB$V_TIMOUT Unit timed out.
UCB$V_UNLOAD Unload volume at dismount.
UCB$V_VALID Volume is software valid.
UCB$V_WRONGVOL Wrong volume detected during mount verification.
UCB$V_WRTLOCKMV Write-locked mount verification in progress.

DVI$_TOTAL_PATH_COUNT

On Alpha and I64 systems, the number of paths for a multipath-capable device returns as an unsigned longword.

DVI$_TRACKS

Returns the number of tracks per cylinder as an unsigned integer longword. This item code is applicable only to disks.

DVI$_TRANSCNT

Returns the transaction count for the volume as an unsigned integer longword.

DVI$_QLEN

On Alpha and I64 systems, returns the queue length for the device as an unsigned integer longword. Note that this value is the number of I/O requests already in the driver and not the depth of the I/O pending queue.

DVI$_TT_ACCPORNAM

Returns the name of the remote access port associated with a channel number or with a physical or virtual terminal device number. If you specify a device that is not a remote terminal or a remote type that does not support this feature, $GETDVI returns a null string. The $GETDVI service returns the access port name as a string. HP recommends a buffer size of 64 bytes to return the name of the remote access port.

The $GETDVI service returns the name in the format of the remote system. If the remote system is a LAT terminal server, $GETDVI returns the name as server_name/port_name. The names are separated by the slash (/) character. If the remote system is an X.29 terminal, the name is returned as network.remote_DTE. For devices using TCP/IP, the name is returned in the format Host: 192.168.1.100 Port: 1.

When writing applications, use the string returned by DVI$_ACCPORNAM (instead of the physical device name) to identify remote terminals.

DVI$_TT_CHARSET

Returns, as a 4-byte bit vector, the character sets supported by the terminal. Each bit in the vector, when set, corresponds to the name of a coded character set. The $TTCDEF macro defines the following coded character sets:
Symbol Description
TTC$V_HANGUL DEC Korean
TTC$V_HANYU DEC Hanyu
TTC$V_HANZI DEC Hanzi
TTC$V_KANA DEC Kana
TTC$V_KANJI DEC Kanji
TTC$V_THAI DEC Thai

DVI$_TT_CS_HANGUL

Returns a longword, which is interpreted as Boolean. A value of 1 indicates that the device supports the DEC Korean coded character set; a value of 0 indicates that the device does not support the DEC Korean coded character set.

DVI$_TT_CS_HANYU

Returns a longword, which is interpreted as Boolean. A value of 1 indicates that the device supports the DEC Hanyu coded character set; a value of 0 indicates that the device does not support the DEC Hanyu coded character set.

DVI$_TT_CS_HANZI

Returns a longword, which is interpreted as Boolean. A value of 1 indicates that the device supports the DEC Hanzi coded character set; a value of 0 indicates that the device does not support the DEC Hanzi coded character set.

DVI$_TT_CS_KANA

Returns a longword, which is interpreted as Boolean. A value of 1 indicates that the device supports the DEC Kana coded character set; a value of 0 indicates that the device does not support the DEC Kana coded character set.

DVI$_TT_CS_KANJI

Returns a longword, which is interpreted as Boolean. A value of 1 indicates that the device supports the DEC Kanji coded character set; a value of 0 indicates that the device does not support the DEC Kanji coded character set.

DVI$_TT_CS_THAI

Returns a longword, which is interpreted as Boolean. A value of 1 indicates that the device supports the DEC Thai coded character set; a value of 0 indicates that the device does not support the DEC Thai coded character set.

DVI$_TT_PHYDEVNAM

Returns a string containing the physical device name of a terminal. If the caller specifies a disconnected virtual terminal or a device that is not a terminal, $GETDVI returns a null string. $GETDVI returns the physical device name as a string.

DVI$_UNIT

Returns the unit number as an unsigned longword.

DVI$_VOLCHAR

On Alpha and I64 systems, returns a 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.

DVI$_VOLCOUNT

Returns the number of volumes in the volume set as an unsigned longword. This item code is applicable only to disks.

DVI$_VOLNAM

Returns the volume name as a string.

DVI$_VOLNUMBER

Returns the volume number of this volume in the volume set as an unsigned integer longword. This item code is applicable only to disks.

DVI$_VOLSETMEM

Returns a longword, which is interpreted as Boolean. A value of 1 indicates that the device is part of a volume set; a value of 0 indicates that it is not. This item code is applicable only to disks.

DVI$_VOLSIZE

On Alpha and I64 systems, returns the current logical volume size of the volume as an unsigned integer longword.

DVI$_VOLUME_EXTEND_QUANTITY

On Alpha and I64 systems, returns the number of blocks to be used as the default extension size for all files on the volume as an unsigned longword.

DVI$_VOLUME_MOUNT_GROUP

On Alpha and I64 systems, returns an unsigned longword, interpreted as Boolean. A value of 1 indicates the volume is mounted /GROUP.

DVI$_VOLUME_MOUNT_SYS

On Alpha and I64 systems, returns an unsigned longword, interpreted as Boolean. A value of 1 indicates the volume is mounted /SYSTEM.

DVI$_VOLUME_PENDING_WRITE_ERR

On Alpha and I64 systems, returns the count of pending write errors on the volume as an unsigned longword.

DVI$_VOLUME_RETAIN_MAX

On Alpha and I64 systems, returns the maximum retention time for the volume as specified with the DCL command SET VOLUME/RETENTION. Because the returned time is in the standard 64-bit absolute time format, specify 8 bytes for the buffer length field in the item descriptor.

DVI$_VOLUME_RETAIN_MIN

On Alpha and I64 systems, returns the minimum retention time for the volume, as specified with the DCL command bit SET VOLUME/RETENTION. Because the returned time is in the standard 64-bit absolute time format, specify 8 bytes for the buffer length field in the item descriptor.

DVI$_VOLUME_SPOOLED_DEV_CNT

On Alpha and I64 systems, returns the number of devices spooled to the volume as an unsigned longword.

DVI$_VOLUME_WINDOW

On Alpha and I64 systems, returns the volume default window size as an unsigned longword.

DVI$_VPROT

Returns the volume protection mask as a standard 4-byte protection mask.

DVI$_TT_xxxx

DVI$_TT_xxxx is the format for a series of item codes that return information about terminals. This information consists of terminal characteristics. The xxxx portion of the item code name specifies a single terminal characteristic.


Previous Next Contents Index