OpenVMS System Services Reference Manual

Updated: 11 December 1998

OpenVMS System Services Reference Manual

Contents

Index

Month abbreviations must be uppercase.

The hundredths-of-second field now represents a true fraction. For example, the string .1 represents ten-hundredths of a second (one-tenth of a second), and the string .01 represents one-hundredth of a second.

Also, you can add a third digit to the hundredths-of-second field; this thousandths-of-second digit is used to round the hundredths-of-second value. Digits beyond the thousandths-of-second digits are ignored.

The results of specifying some possible combinations for the values of the cvtflg and timbuf arguments are as follows.

Time Value Buffer Length
Specified CVTFLG
Argument Information
Returned

Absolute 23 0 Date and time

Absolute 12 0 Date

Absolute 11 1 Time

Delta 16 0 Days and time

Delta 11 1 Time

Time Value	Buffer Length Specified	CVTFLG Argument	Information Returned
Absolute	23	0	Date and time
Absolute	12	0	Date
Absolute	11	1	Time
Delta	16	0	Days and time
Delta	11	1	Time

Required Access or Privileges

None

Required Quota

None

Related Services

$BINTIM, $CANTIM, $CANWAK, $GETTIM, $NUMTIM, $SCHDWK, $SETIME, $SETIMR

Condition Values Returned

SS$_NORMAL The service completed successfully.

SS$_BUFFEROVF The buffer length specified in the timbuf argument is too small.

SS$_INSFARG Required argument is missing.

SS$_IVTIME The specified delta time is equal to or greater than 10,000 days.

$ASCTOID

Translates the specified identifier name into its binary identifier value.
On Alpha systems, this service accepts 64-bit addresses.

Format

SYS$ASCTOID name ,[id] ,[attrib]

C Prototype

int sys$asctoid (void *name, unsigned int *id, unsigned int *attrib);

Arguments

name

OpenVMS usage: char_string

type: character-coded text string

access: read only

mechanism: by 32- or 64-bit descriptor--fixed-length string descriptor (Alpha)

mechanism: by 32-bit descriptor--fixed-length string descriptor (VAX)

Identifier name translated when $ASCTOID completes execution. The name argument is the 32- or 64-bit address (on Alpha systems) or the 32-bit address (on VAX systems) of a character-string descriptor pointing to the identifier name.
id

OpenVMS usage: rights_id

type: longword (unsigned)

access: write only

mechanism: by 32- or 64-bit reference (Alpha)

mechanism: by 32-bit reference (VAX)

Identifier value resulting when $ASCTOID completes execution. The id argument is the 32- or 64-bit address (on Alpha systems) or the 32-bit address (on VAX systems) of a longword in which the identifier value is written.
attrib

OpenVMS usage: mask_longword

type: longword (unsigned)

access: write only

mechanism: by 32- or 64-bit reference (Alpha)

mechanism: by 32-bit reference (VAX)

Attributes associated with the identifier returned in id when $ASCTOID completes execution. The attrib argument is the 32- or 64-bit address (on Alpha systems) or the 32-bit address (on VAX systems) of a longword containing a bit mask specifying the attributes.
Symbol values are offsets to the bits within the longword. You can also obtain the values as masks with the appropriate bit set using the prefix KGB$M rather than KGB$V. The symbols are defined in the system macro $KGBDEF library. The symbolic names for each bit position are listed in the following table.

Bit Position Meaning When Set

KGB$V_DYNAMIC Allows holders of the identifier to remove it from or add it to the process rights database by using the DCL command SET RIGHTS_LIST.

KGB$V_HOLDER_HIDDEN Prevents someone from getting a list of users who hold an identifier, unless they own the identifier themselves. Special privilege is required to translate hidden names.

KGB$V_NAME_HIDDEN Allows holders of an identifier to have it translated---either from binary to ASCII or vice versa---but prevents unauthorized users from translating the identifier. Special privilege is required to translate hidden names.

KGB$V_NOACCESS Makes any access rights of the identifier null and void. This attribute is intended as a modifier for a resource identifier or the Subsystem attribute.

KGB$V_RESOURCE Allows the holder to charge resources, such as disk blocks, to the identifier.

KGB$V_SUBSYSTEM Allows holders of the identifier to create and maintain protected subsystems by assigning the Subsystem access control entry (ACE) to the application images in the subsystem.

Bit Position	Meaning When Set
KGB$V_DYNAMIC	Allows holders of the identifier to remove it from or add it to the process rights database by using the DCL command SET RIGHTS_LIST.
KGB$V_HOLDER_HIDDEN	Prevents someone from getting a list of users who hold an identifier, unless they own the identifier themselves. Special privilege is required to translate hidden names.
KGB$V_NAME_HIDDEN	Allows holders of an identifier to have it translated---either from binary to ASCII or vice versa---but prevents unauthorized users from translating the identifier. Special privilege is required to translate hidden names.
KGB$V_NOACCESS	Makes any access rights of the identifier null and void. This attribute is intended as a modifier for a resource identifier or the Subsystem attribute.
KGB$V_RESOURCE	Allows the holder to charge resources, such as disk blocks, to the identifier.
KGB$V_SUBSYSTEM	Allows holders of the identifier to create and maintain protected subsystems by assigning the Subsystem access control entry (ACE) to the application images in the subsystem.

Description

The Translate Identifier Name to Identifier service converts the specified identifier name to its binary identifier value.
Required Access or Privileges

None, unless the id is KGB$V_NAME_HIDDEN, in which case you must hold the id or have access to the rights database.
Required Quota

None
Related Services

$ADD_HOLDER, $ADD_IDENT, $CREATE_RDB, $FIND_HELD, $FIND_HOLDER, $FINISH_RDB, $GRANTID, $IDTOASC, $MOD_HOLDER, $MOD_IDENT, $REM_HOLDER, $REM_IDENT, $REVOKID

Condition Values Returned

SS$_NORMAL The service completed successfully.

SS$_ACCVIO The name argument cannot be read by the caller, or the id or attrib arguments cannot be written by the caller.

SS$_INSFMEM The process dynamic memory is insufficient for opening the rights database.

SS$_IVIDENT The format of the specified identifier is invalid.

SS$_NOSUCHID The specified identifier name does not exist in the rights database, or the identifier is hidden and you do not have access to the rights database.

SS$_NORIGHTSDB The rights database does not exist.

Because the rights database is an indexed file accessed with OpenVMS RMS, this service can also return RMS status codes associated with operations on indexed files. For descriptions of these status codes, refer to the OpenVMS Record Management Services Reference Manual.

$ASCUTC

Converts an absolute time from 128-bit UTC format to an ASCII string.
On Alpha systems, this service accepts 64-bit addresses.

Format

SYS$ASCUTC [timlen] ,timbuf ,[utcadr] ,[cvtflg]

C Prototype

int sys$ascutc (unsigned short int *timlen, void *timbuf, unsigned int *utcadr [4], char cvtflg);

Arguments

timlen

OpenVMS usage: word_unsigned

type: word (unsigned)

access: write only

mechanism: by 32- or 64-bit reference (Alpha)

mechanism: by 32-bit reference (VAX)

Length (in bytes) of the ASCII string returned by $ASCUTC. The timlen argument is the 32-bit address (on VAX systems) or the 32- or 64-bit address (on Alpha systems) of a word containing this length.
timbuf

OpenVMS usage: time_name

type: character-coded string text

access: write only

mechanism: by 32- or 64-bit descriptor--fixed-length string descriptor (Alpha)

mechanism: by 32-bit descriptor--fixed-length string descriptor (VAX)

Buffer into which $ASCUTC writes the ASCII string. The timbuf argument is the 32-bit address (on VAX systems) or the 32- or 64-bit address (on Alpha systems) of a character string descriptor pointing to the buffer. The buffer length specified in the timbuf argument, together with the cvtflg argument, controls what information is returned.
utcadr

OpenVMS usage: coordinated universal time

type: utc_date_time

access: read only

mechanism: by 32- or 64-bit reference (Alpha)

mechanism: by 32-bit reference (VAX)

Time value that $ASCUTC is to convert. The timadr argument is the 32-bit address (on VAX systems) or the 32- or 64-bit address (on Alpha systems) of this 128-bit time value. Relative times are not permitted. If the timadr argument is not specified, it defaults to 0 and $ASCUTC returns the current date and time.
cvtflg

OpenVMS usage: longword_unsigned

type: longword (unsigned)

access: read only

mechanism: by value

Conversion indicator specifying which date and time fields $ASCUTC should return. The cvtflg argument is a longword value that is interpreted as Boolean. The value 1 specifies that $ASCUTC should return only the time, including hour, minute, second, and hundredths-of-second fields. The default value 0 specifies that $ASCUTC should return the full date and time.

Description

The Convert UTC to ASCII service converts an absolute time from 128-bit UTC format to an ASCII string. The service executes at the access mode of the caller and does not check whether address arguments are accessible before it executes. Therefore, an access violation causes an exception condition if the input time value cannot be read or the output buffer or buffer length cannot be written.
The $ASCUTC service uses the time zone differential factor encoded in the 128-bit UTC to convert the UTC to an ASCII string.
This service does not check the length of the argument list, and therefore cannot return the SS$_INSFARG condition value.
The ASCII strings returned have the following format:

Absolute Time: dd-mmm-yyyy hh:mm:ss.cc

The following table lists the length (in bytes), contents, and range of values for each field in the absolute time format.

Field Length
(Bytes) Contents Range of Values

dd 2 Day of month 1--31

-- 1 Hyphen Required syntax

mmm 3 Month JAN, FEB, MAR, APR, MAY, JUN, JUL, AUG, SEP, OCT, NOV, DEC

-- 1 Hyphen Required syntax

yyyy 4 Year 1858--9999

blank n Blank Required syntax

hh 2 Hour 00--23

: 1 Colon Required syntax

mm 2 Minutes 00--59

: 1 Colon Required syntax

ss 2 Seconds 00--59

. 1 Period Required syntax

cc 2 Hundredths-of-second 00--99

The results of specifying some possible combinations for the values of the cvtflg and timbuf arguments are as follows.

Time Value Buffer Length
Specified CVTFLG
Argument Information
Returned

Absolute 23 0 Date and time

Absolute 12 0 Date

Absolute 11 1 Time

Required Access or Privileges

None
Required Quota

None
Related Services

$BINUTC, $GETUTC, $NUMUTC, $TIMCON

Field	Length (Bytes)	Contents	Range of Values
dd	2	Day of month	1--31
--	1	Hyphen	Required syntax
mmm	3	Month	JAN, FEB, MAR, APR, MAY, JUN, JUL, AUG, SEP, OCT, NOV, DEC
--	1	Hyphen	Required syntax
yyyy	4	Year	1858--9999
blank	n	Blank	Required syntax
hh	2	Hour	00--23
:	1	Colon	Required syntax
mm	2	Minutes	00--59
:	1	Colon	Required syntax
ss	2	Seconds	00--59
.	1	Period	Required syntax
cc	2	Hundredths-of-second	00--99

Time Value	Buffer Length Specified	CVTFLG Argument	Information Returned
Absolute	23	0	Date and time
Absolute	12	0	Date
Absolute	11	1	Time

Condition Values Returned

SS_$NORMAL The service completed successfully.

SS_$BUFFEROVF The buffer length specified in the timbuf argument is too small.

SS_$INVTIME The UTC time supplied is too small to be represented as a Smithsonian Time, or the UTC time is not valid.

$ASSIGN

Provides a process with an I/O channel so input/output operations can be performed on a device, or establishes a logical link with a remote node on a network.
On Alpha systems, this service accepts 64-bit addresses.

Format

SYS$ASSIGN devnam ,chan ,[acmode] ,[mbxnam] ,[flags]

C Prototype

int sys$assign (void *devnam, unsigned short int *chan, unsigned int acmode, void *mbxnam,...);

Arguments

devnam

OpenVMS usage: device_name

type: character-coded text string

access: read only

mechanism: by 32- or 64-bit descriptor--fixed-length string descriptor (Alpha)

mechanism: by 32-bit descriptor--fixed-length string descriptor (VAX)

Name of the device to which $ASSIGN is to assign a channel. The devnam argument is the 32- or 64-bit address (on Alpha systems) or the 32-bit address (on VAX systems) of a character string descriptor pointing to the device name string.
If the device name contains a double colon (::), the system assigns a channel to the first available network device (NET:) and performs an access function on the network.
chan

OpenVMS usage: channel

type: word (unsigned)

access: write only

mechanism: by 32- or 64-bit reference (Alpha)

mechanism: by 32-bit reference (VAX)

Number of the channel that is assigned. The chan argument is the 32- or 64-bit address (on Alpha systems) or the 32-bit address (on VAX systems) of a word into which $ASSIGN writes the channel number.
acmode

OpenVMS usage: access_mode

type: longword (unsigned)

access: read only

mechanism: by value

Access mode to be associated with the channel. The acmode argument specifies the access mode. The $PSLDEF macro defines the following symbols for the four access modes.

Symbol Access Mode Numeric Value

PSL$C_KERNEL Kernel 0

PSL$C_EXEC Executive 1

PSL$C_SUPER Supervisor 2

PSL$C_USER User 3

The specified access mode and the access mode of the caller are compared. The less privileged (but the higher numeric valued) of the two access modes becomes the access mode associated with the assigned channel. I/O operations on the channel can be performed only from equal and more privileged access modes. For more information, refer to the section on access modes in the OpenVMS Programming Concepts Manual.
mbxnam

OpenVMS usage: device_name

type: character-coded text string

access: read only

mechanism: by 32- or 64-bit descriptor--fixed-length string descriptor (Alpha)

mechanism: by 32-bit descriptor--fixed-length string descriptor (VAX)

Logical name of the mailbox to be associated with the device. The mbxnam argument is the 32- or 64-bit address (on Alpha systems) or the 32-bit address (on VAX systems) of a character string descriptor pointing to the logical name string.
If you specify mbxnam as 0, no mailbox is associated with the device. This is the default.
You must specify the mbxnam argument when performing a nontransparent, task-to-task, network operation.
Only the owner of a device can associate a mailbox with the device; the owner of a device is the process that has allocated the device, whether implicitly or explicitly. Only one mailbox can be associated with a device at any one time.
For unshareable, nonspooled devices, an implicit $ALLOCATE is done. This requires read, write, or control access to the device.
A mailbox cannot be associated with a device if the device has foreign (DEV$M_FOR) or shareable (DEV$M_SHR) characteristics.
A mailbox is disassociated from a device when the channel that associated it is deassigned.
If a mailbox is associated with a device, the device driver can send status information to the mailbox. For example, if the device is a terminal, this information might indicate dialup, hangup, or the reception of unsolicited input; if the device is a network device, it might indicate that the network is connected or perhaps that the line is down.
For details on the nature and format of the information returned to the mailbox, refer to the OpenVMS I/O User's Reference Manual.
flags

OpenVMS usage: mask_longword

type: longword (unsigned)

access: read only

mechanism: by value

An optional device-specific argument. The flags argument is a longword bit mask. For more information on the applicability of the flags argument for a particular device, refer to the OpenVMS I/O User's Reference Manual.

Symbol	Access Mode	Numeric Value
PSL$C_KERNEL	Kernel	0
PSL$C_EXEC	Executive	1
PSL$C_SUPER	Supervisor	2
PSL$C_USER	User	3

Description

The Assign I/O Channel service provides a process with an I/O channel so input/output operations can be performed on a device. This service also establishes a logical link with a remote node on a network.
Channels remain assigned until they are explicitly deassigned with the Deassign I/O Channel ($DASSGN) service or, if they are user-mode channels, until the image that assigned the channel exits.
The $ASSIGN service establishes a path to a device but does not check whether the caller can actually perform input/output operations to the device. Privilege and protection restrictions can be applied by the device drivers.
Required Access or Privileges

The calling process must have NETMBX privilege to perform network operations, and system dynamic memory is required if the target device is on a remote system.
Note that you should use the SHARE privilege with caution. Applications, application protocols, and device drivers coded to expect only exclusive access can encounter unexpected and errant behavior when access to the device is unexpectedly shared. Unless the SHARE privilege is explicitly supported by the application, the application protocol, and the device driver, its use is generally discouraged. Refer to the OpenVMS Programming Concepts Manual for additional information.
Required Quota

If the target of the assignment is on a remote node, the process needs sufficient buffer quota to allocate a network control block.
Related Services

$ALLOC, $BRKTHRU, $BRKTHRUW, $CANCEL, $CREMBX, $DALLOC, $DASSGN, $DELMBX, $DEVICE_SCAN, $DISMOU, $GETDVI, $GETDVIW, $GETMSG, $GETQUI, $GETQUIW, $INIT_VOL, $MOUNT, $PUTMSG, $QIO, $QIOW, $SNDERR, $SNDJBC, $SNDJBCW, $SNDOPR

Condition Values Returned

SS$_NORMAL The service completed successfully.

SS$_REMOTE The service completed successfully. A logical link is established with the target on a remote node.

SS$_ABORT A physical line went down during a network connect operation.

SS$_ACCVIO The device or mailbox name string or string descriptor cannot be read by the caller, or the channel number cannot be written by the caller.

SS$_CONNECFAIL For network operations, the connection to a network object timed out or failed.

SS$_DEVACTIVE You specified a mailbox name, but a mailbox is already associated with the device.

SS$_DEVALLOC The device is allocated to another process.

SS$_DEVNOTMBX You specified a logical name for the associated mailbox, but the logical name refers to a device that is not a mailbox.

SS$_DEVOFFLINE For network operations, the physical link is shutting down.

SS$_EXQUOTA The target of the assignment is on a remote node and the process has insufficient buffer quota to allocate a network control block.

SS$_FILALRACC For network operations, a logical link already exists on the channel.

SS$_INSFMEM The target of the assignment is on a remote node and there is insufficient system dynamic memory to complete the request.

SS$_INVLOGIN For network operations, the access control information was found to be invalid at the remote node.

SS$_IVDEVNAM No device name was specified, the logical name translation failed, or the device or mailbox name string contains invalid characters. If the device name is a target on a remote node, this status code indicates that the network connect block has an invalid format.

SS$_IVLOGNAM The device or mailbox name string has a length of 0 or has more than 63 characters.

SS$_LINKEXIT For network operations, the network partner task was started, but exited before confirming the logical link (that is, $ASSIGN to SYS$NET).

SS$_NOIOCHAN No I/O channel is available for assignment.

SS$_NOLINKS For network operations, no logical links are available. The maximum number of logical links as set for the Network Control Program (NCP) executor MAXIMUM LINKS parameter was exceeded.

SS$_NOPRIV For network operations, the issuing task does not have the required privilege to perform network operations or to confirm the specified logical link.

SS$_NOSUCHDEV The specified device or mailbox does not exist, or, for DECnet for OpenVMS operations, the network device driver is not loaded (for example, the DECnet for OpenVMS software is not currently running on the local node).

SS$_NOSUCHNODE The specified network node is nonexistent or unavailable.

SS$_NOSUCHOBJ For network operations, the network object number is unknown at the remote node; for a TASK= connect, the named DCL command procedure file cannot be found at the remote node.

SS$_NOSUCHUSER For network operations, the remote node could not recognize the login information supplied with the connection request.

SS$_PROTOCOL For network operations, a network protocol error occurred, most likely because of a network software error.

SS$_REJECT The network connect was rejected by the network software or by the partner at the remote node, or the target image exited before the connect confirm could be issued.

SS$_REMRSRC For network operations, the link could not be established because system resources at the remote node were insufficient.

SS$_SHUT For network operations, the local or remote node is no longer accepting connections.

SS$_THIRDPARTY For network operations, the logical link connection was terminated by a third party (for example, the system manager).

SS$_TOOMUCHDATA For network operations, the task specified too much optional or interrupt data.

SS$_UNREACHABLE For network operations, the remote node is currently unreachable.

Contents

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OpenVMS System Services Reference Manual

Condition Values Returned

$ASCTOID

Format

SYS$ASCTOID name ,[id] ,[attrib]

C Prototype

int sys$asctoid (void name, unsigned int id, unsigned int *attrib);

Arguments

name

id

attrib

Description

Condition Values Returned

$ASCUTC

Format

SYS$ASCUTC [timlen] ,timbuf ,[utcadr] ,[cvtflg]

C Prototype

int sys$ascutc (unsigned short int timlen, void timbuf, unsigned int *utcadr [4], char cvtflg);

Arguments

timlen

timbuf

utcadr

cvtflg

Description

Condition Values Returned

$ASSIGN

Format

SYS$ASSIGN devnam ,chan ,[acmode] ,[mbxnam] ,[flags]

C Prototype

int sys$assign (void devnam, unsigned short int chan, unsigned int acmode, void *mbxnam,...);

Arguments

devnam

chan

acmode

mbxnam

flags

Description

Condition Values Returned

SS$_NORMAL	The service completed successfully.
SS$_BUFFEROVF	The buffer length specified in the timbuf argument is too small.
SS$_INSFARG	Required argument is missing.
SS$_IVTIME	The specified delta time is equal to or greater than 10,000 days.

OpenVMS usage:	char_string
type:	character-coded text string
access:	read only
mechanism:	by 32- or 64-bit descriptor--fixed-length string descriptor (Alpha)
mechanism:	by 32-bit descriptor--fixed-length string descriptor (VAX)

OpenVMS usage:	rights_id
type:	longword (unsigned)
access:	write only
mechanism:	by 32- or 64-bit reference (Alpha)
mechanism:	by 32-bit reference (VAX)

OpenVMS usage:	mask_longword
type:	longword (unsigned)
access:	write only
mechanism:	by 32- or 64-bit reference (Alpha)
mechanism:	by 32-bit reference (VAX)

SS$_NORMAL	The service completed successfully.
SS$_ACCVIO	The name argument cannot be read by the caller, or the id or attrib arguments cannot be written by the caller.
SS$_INSFMEM	The process dynamic memory is insufficient for opening the rights database.
SS$_IVIDENT	The format of the specified identifier is invalid.
SS$_NOSUCHID	The specified identifier name does not exist in the rights database, or the identifier is hidden and you do not have access to the rights database.
SS$_NORIGHTSDB	The rights database does not exist.

OpenVMS usage:	word_unsigned
type:	word (unsigned)
access:	write only
mechanism:	by 32- or 64-bit reference (Alpha)
mechanism:	by 32-bit reference (VAX)

OpenVMS usage:	time_name
type:	character-coded string text
access:	write only
mechanism:	by 32- or 64-bit descriptor--fixed-length string descriptor (Alpha)
mechanism:	by 32-bit descriptor--fixed-length string descriptor (VAX)

OpenVMS usage:	coordinated universal time
type:	utc_date_time
access:	read only
mechanism:	by 32- or 64-bit reference (Alpha)
mechanism:	by 32-bit reference (VAX)

OpenVMS usage:	longword_unsigned
type:	longword (unsigned)
access:	read only
mechanism:	by value

SS_$NORMAL	The service completed successfully.
SS_$BUFFEROVF	The buffer length specified in the timbuf argument is too small.
SS_$INVTIME	The UTC time supplied is too small to be represented as a Smithsonian Time, or the UTC time is not valid.

OpenVMS usage:	device_name
type:	character-coded text string
access:	read only
mechanism:	by 32- or 64-bit descriptor--fixed-length string descriptor (Alpha)
mechanism:	by 32-bit descriptor--fixed-length string descriptor (VAX)

OpenVMS usage:	channel
type:	word (unsigned)
access:	write only
mechanism:	by 32- or 64-bit reference (Alpha)
mechanism:	by 32-bit reference (VAX)

OpenVMS usage:	access_mode
type:	longword (unsigned)
access:	read only
mechanism:	by value

SS$_NORMAL	The service completed successfully.
SS$_REMOTE	The service completed successfully. A logical link is established with the target on a remote node.
SS$_ABORT	A physical line went down during a network connect operation.
SS$_ACCVIO	The device or mailbox name string or string descriptor cannot be read by the caller, or the channel number cannot be written by the caller.
SS$_CONNECFAIL	For network operations, the connection to a network object timed out or failed.
SS$_DEVACTIVE	You specified a mailbox name, but a mailbox is already associated with the device.
SS$_DEVALLOC	The device is allocated to another process.
SS$_DEVNOTMBX	You specified a logical name for the associated mailbox, but the logical name refers to a device that is not a mailbox.
SS$_DEVOFFLINE	For network operations, the physical link is shutting down.
SS$_EXQUOTA	The target of the assignment is on a remote node and the process has insufficient buffer quota to allocate a network control block.
SS$_FILALRACC	For network operations, a logical link already exists on the channel.
SS$_INSFMEM	The target of the assignment is on a remote node and there is insufficient system dynamic memory to complete the request.
SS$_INVLOGIN	For network operations, the access control information was found to be invalid at the remote node.
SS$_IVDEVNAM	No device name was specified, the logical name translation failed, or the device or mailbox name string contains invalid characters. If the device name is a target on a remote node, this status code indicates that the network connect block has an invalid format.
SS$_IVLOGNAM	The device or mailbox name string has a length of 0 or has more than 63 characters.
SS$_LINKEXIT	For network operations, the network partner task was started, but exited before confirming the logical link (that is, $ASSIGN to SYS$NET).
SS$_NOIOCHAN	No I/O channel is available for assignment.
SS$_NOLINKS	For network operations, no logical links are available. The maximum number of logical links as set for the Network Control Program (NCP) executor MAXIMUM LINKS parameter was exceeded.
SS$_NOPRIV	For network operations, the issuing task does not have the required privilege to perform network operations or to confirm the specified logical link.
SS$_NOSUCHDEV	The specified device or mailbox does not exist, or, for DECnet for OpenVMS operations, the network device driver is not loaded (for example, the DECnet for OpenVMS software is not currently running on the local node).
SS$_NOSUCHNODE	The specified network node is nonexistent or unavailable.
SS$_NOSUCHOBJ	For network operations, the network object number is unknown at the remote node; for a TASK= connect, the named DCL command procedure file cannot be found at the remote node.
SS$_NOSUCHUSER	For network operations, the remote node could not recognize the login information supplied with the connection request.
SS$_PROTOCOL	For network operations, a network protocol error occurred, most likely because of a network software error.
SS$_REJECT	The network connect was rejected by the network software or by the partner at the remote node, or the target image exited before the connect confirm could be issued.
SS$_REMRSRC	For network operations, the link could not be established because system resources at the remote node were insufficient.
SS$_SHUT	For network operations, the local or remote node is no longer accepting connections.
SS$_THIRDPARTY	For network operations, the logical link connection was terminated by a third party (for example, the system manager).
SS$_TOOMUCHDATA	For network operations, the task specified too much optional or interrupt data.
SS$_UNREACHABLE	For network operations, the remote node is currently unreachable.