skip book previous and next navigation links
go up to top of book: HP OpenVMS I/O User's Reference Manual HP OpenVMS I/O User's Reference Manual
go to beginning of chapter: ACP-QIO Interface ACP-QIO Interface
go to previous page: ACP-QIO Attributes Statistics Block ACP-QIO Attributes Statistics Block
go to next page: I/O Status BlockI/O Status Block
end of book navigation links

Major Functions  



The following sections describe the operation of the major ACP functions. Each section describes the required and optional parameters for a particular function, as well as the sequence in which the function is performed. For clarity, when a major function invokes a subfunction, the input parameters used by the subfunction are omitted.

Create File  

Create file is a virtual I/O function that creates a directory entry or a file on a disk device, or a file on a magnetic tape device.

The following is the function code:

The following are the function modifiers:

Input Parameters  

The following are the device- or function-dependent arguments for IO$_CREATE:

IO$_CREATE and the FIB lists fields in the FIB that are applicable to the IO$_CREATE operation.

Table 11   IO$_CREATE and the FIB
Field Subfields Meaning
FIB$L_ACCTL

Specifies field values that control access to the file. The following bits are applicable to the IO$_CREATE function:

FIB$V_REWIND
Set to rewind magnetic tape before creating the file. Any data currently on the tape is overwritten.

FIB$V_CURPOS
Set to create magnetic tape file at the current tape position. (Note: a magnetic tape file is created at the end of the volume set if neither FIB$V_REWIND nor FIB$V_CURPOS is set.) If the tape is not positioned at the end of a file, FIB$V_CURPOS creates a file at the next file position. Any data currently on the tape past the current file position is overwritten.

FIB$V_WRITETHRU
Specifies that the file header is to be written back to the disk. If not specified and the file is opened, writing of the file header can be deferred to some later time.
FIB$W_CNTRLFUNC

Specifies the following value, which allows you to control actions subsequent to EOT detection on a magnetic tape file.
FIB$W_FID

Contains the file ID of the file created or entered.
FIB$W_DID

Contains the file identifier of the directory file.
FIB$W_NMCTL

Controls the processing of the file name in a directory operation. The following bits are applicable to the IO$_CREATE function:

FIB$V_NEWVER
Set to create a file of the same name with the next higher version number. Only for disk devices.

FIB$V_SUPERSEDE
Set to supersede an existing file of the same name, type, and version. Only for disk devices.

FIB$V_LOWVER
Set on return if a lower numbered version of the file exists. Only for disk devices.

FIB$V_HIGHVER
Set on return if a higher numbered version of the file exists. Only for disk devices.
FIB$W_VERLIMIT

Specifies the version limit for the directory entry created. Used only for disk devices and only when the first version of a new file is created. If 0, the directory default is used. If a directory operation was performed, FIB$W_VERLIMIT always contains the actual version limit of the file.
FIB$L_ACL_STATUS

Status of the requested ACL attribute operation, if any. The ACL attributes are included in ACP-QIO Attributes. If no ACL attributes are given, SS$_NORMAL is returned here.
FIB$L_STATUS

Access status. Programmers can control the security information being propagated as well as the source of this information by setting the following bits.

Disk ACP Operation  

If the modifier IO$M_CREATE is specified, a file is created. The file ID of the file created is returned in FIB$W_FID. If the modifier IO$M_DELETE is specified, the file is marked for deletion.

If a nonzero directory ID is specified in FIB$W_DID, a directory entry is created. The file name specified by parameter P2 is entered in the directory, together with the file ID in FIB$W_FID. ( FIB Fields (Lookup Control) describes the format for the file name string.) Wildcards are not permitted. Negative version numbers are treated as equivalent to a 0 version number. If a result string buffer and length are specified by P3 and P4, the actual file name entered, and its length, are returned.

The version number of the file receives the following treatment:

The file name string entered in the directory is returned using the P3 and P4 result string parameters, if present. The file name string is also written into the header. If no directory operation was requested (FIB$W_DID is 0), the file name string specified by P2, if any, is written into the file header.

If an attribute list is specified by P5, a write attributes subfunction is performed (see Read/Write Attributes).

If the modifier IO$M_ACCESS is specified, the file is opened (see Access).

If the extend enable bit FIB$V_EXTEND is specified in the FIB, an extend subfunction is performed (see Extend).

Finally, if a file was set aside for deletion (IO$M_DELETE is specified), that file is deleted. If the file is deleted because the FIB$V_SUPERSEDE bit was set, the alternate success status SS$_SUPERSEDE is returned in the I/O status block. If the file is deleted because the version limit was exceeded, the alternate success status SS$_FILEPURGED is returned.

If an error occurs in the operation of an IO$_CREATE function, all actions performed to that point are reversed (the file is neither created nor changed), and the error status is returned to the user in the I/O status block.

Directory Entry Creation  

Creating a new version of a file eliminates default access to the previously highest version of the file. For example, creating RESUME.TXT;4 masks RESUME.TXT;3 so the DCL command TYPE RESUME.TXT yields the contents of version 4, not version 3. To protect the contents of the earlier version of a file, the creator of a file must have write access to the previous version of a file of the same name.

Magnetic Tape ACP Operation  

No operation is performed unless the IO$M_CREATE modifier is specified. The magnetic tape is positioned as specified by FIB$V_REWIND and FIB$V_CURPOS, and the file is created. The name specified by the P2 parameter is written into the file header label.

If P5 specifies an attribute list, a write attributes subfunction is performed (see Read/Write Attributes).

If the modifier IO$M_ACCESS is specified, the file is opened (see Access).

Access File  

This virtual I/O function searches a directory on a disk device or a magnetic tape for a specified file and accesses that file if found.

The following is the function code:

The following are the function modifiers:

Input Parameters  

The following are the device- or function-dependent arguments for IO$_ACCESS:

IO$_ACCESS and the File Information Block lists FIB fields that are applicable to the IO$_ACCESS operation.

Table 12   IO$_ACCESS and the File Information Block
Field Subfields Meaning
FIB$W_

CNTRLFUNC

Specifies the value that allows the user to control actions subsequent to EOT detection on a magnetic tape file.
FIB$W_VERLIMIT

Receives the version limit for the file. Applicable only if FIB$W_DID is a nonzero number (if a directory lookup is done). Used only for disk devices.
FIB$L_ACL_STATUS

Status of the requested ACL attribute operation, if any. The ACL attributes are included in ACP-QIO Attributes. If no ACL attributes are given, SS$_NORMAL is returned here. (For Files-11 C/D, this field is always set to SS$_NORMAL.)
FIB$L_STATUS

Alternate access status. The following bits are supported:

FIB$V_ALT_REQ
Set to indicate whether the alternate access bit is required for the current operation. If not set, the alternate access bit is optional.

FIB$V_ALT_GRANTED
If FIB$V_ALT_REQ = 0 and the alternate access check succeeded, the FIB bit returned from the file system is set.
FIB$L_ALT_ACCESS

A 32-bit mask that represents an access mask to check against file protection; for example, to open a file for read and to check whether it can be deleted. The mask has the same configuration as the standard protection mask.

Operation  

If a nonzero directory file ID is specified in FIB$W_DID, a lookup subfunction is performed (see Directory Lookup.) The version limit of the file found is returned in FIB$W_VERLIMIT.

If the directory search fails with a "file not found" condition and the IO$M_CREATE function modifier is specified, the function is reexecuted as a CREATE. In that case, the argument interpretations for IO$_CREATE, rather than those for IO$_ACCESS, apply.

If IO$M_ACCESS is specified, an access subfunction is performed to open the file (see Access).

If P5 specifies an attribute list, a read attributes subfunction is performed (see Read/Write Attributes).

Deaccess File  

Deaccess file is a virtual I/O function that deaccesses a file and, if specified, writes final attributes in the file header.

The following is the function code:

IO$_DEACCESS takes no function modifiers.

Input Parameters  

The following are the device- or function-dependent arguments for IO$_DEACCESS:

The following FIB fields are applicable to the IO$_DEACCESS function:

Field Meaning
FIB$W_FID
File ID of the file being deaccessed. This field can contain a value of 0. If it does not, it must match the file identifier of the accessed file.
FIB$L_ACL_STATUS
Status of the requested ACL attribute operation, if any. The ACL attributes are included in ACP-QIO Attributes. If no ACL attributes are given, SS$_NORMAL is returned here. (For Files-11 C/D, this field is always set to SS$_NORMAL.)

Operation  

For disk files, if P5 specifies an attribute control list and the file was accessed for a write operation, a write attributes subfunction is performed (see Read/Write Attributes). If the file was opened for write, no attributes were specified, and FIB$V_DLOCK was set when the file was accessed, the deaccess lock bit is set in the file header, inhibiting further access to that file.

For disk files, if the truncate enable bit FIB$V_TRUNC is specified in the FIB, a truncate subfunction is performed (see Truncate).

Finally, the file is closed. Trailer labels are written for a magnetic tape file that was opened for write.

Modify File  

Modify file is a virtual I/O function that modifies the file attributes or allocation of a disk file. The IO$_MODIFY function is not applicable to magnetic tape; that is, the function returns success, but no action is performed.

The following is the function code:

The following is the function modifier:

Input Parameters  

The following are the device- or function-dependent arguments for IO$_MODIFY:

The following FIB fields are applicable to the IO$_MODIFY function:

Field Subfields Meaning
FIB$L_ACCTL

Specifies field values that control access to the file. The following bit is applicable to the IO$_MODIFY function:

FIB$V_WRITETHRU
Specifies that the file header is to be written back to the disk. If not specified and the file is currently open, writing of the file header can be deferred to some later time.
FIB$W_VERLIMIT

If a nonzero number, specifies the version limit for the file.
FIB$L_ACL_STATUS

Status of the requested ACL attribute operation. The ACL attributes are listed in ACP-QIO Attributes. If no ACL attributes are given, SS$_NORMAL is returned here.

Operation 

If a nonzero directory ID is specified in FIB$W_DID, a lookup subfunction is executed (see Directory Lookup). If a nonzero version limit is specified in FIB$W_VERLIMIT and the directory entry found is the latest version of that file, the version limit is set to the value specified.

If P5 specifies an attribute list, a write attributes subfunction is performed (see Read/Write Attributes).

The file can be either extended or truncated. If FIB$V_EXTEND is specified in the FIB, an extend subfunction is performed (see Extend). If FIB$V_TRUNC is specified in the FIB, a truncate subfunction is performed (see Truncate). Extend and truncate operations cannot be performed at the same time.

Delete File  

Delete file is a virtual I/O function that removes a directory entry or file header from a disk volume.

The following is the function code:

The following is the function modifier:

The following are the device- or function-dependent arguments for IO$_DELETE:

The following FIB fields are applicable to the IO$_DELETE function:

Field Subfields Meaning
FIB$L_ACCTL

Specifies field values that control access to the file. The following bits are applicable to the IO$_DELETE function:

FIB$V_NOLOCK (Alpha only)
Allows the caller to mark a file for delete that is currently open for write access. When the file is closed, it is automatically deleted. The file cannot be accessed by new callers after it has been marked for delete.

FIB$V_WRITETHRU
Specifies that the file header is to be written back to the disk. If not specified and the file is currently open, writing of the file header can be deferred to some later time.
FIB$W_DID

Contains the file identifier of the directory file. This field must be a nonzero number.
FIB$W_FID

Specifies the file identification to be deleted.

Operation  

If a nonzero directory ID is specified in FIB$W_DID, a lookup subfunction is performed (see Directory Lookup). The file name located is removed from the directory.

If the function modifier IO$M_DELETE is specified, the file is marked for deletion. If the file is not currently open, it is deleted immediately. If the file is open, it is deleted when the last accessor closes it.

Movefile Subfunction 

The movefile subfunction permits you to move the contents of a file, or part of the contents of a file, to a new disk location. This subfunction can, for example, form the basis of a disk defragmentation application.

You can disable movefile operations on specific user files by specifying the /NOMOVE qualifier on the SET FILE command. Use the DIRECTORY/FULL and the DUMP/HEADER commands to find out if movefile operations are disabled on a file.

Calling the Movefile Subfunction  

A program can invoke a movefile subfunction by issuing a QIO request using the function code IO$_MODIFY and the function modifier IO$M_MOVEFILE. This section describes the various input parameters that control the processing of movefile operations together with an operational description.

Input Parameters    FIB Fields (Movefile) lists the FIB fields that control the processing of a movefile subfunction.

Table 13   FIB Fields (Movefile)
Field Subfields Meaning
FIB$L_ACCTL

Movefile control flag. The following flags are applicable:

FIB$V_NOVERIFY
Inhibits comparison of the moved blocks. If this flag is clear, the movefile operation verifies that the operation was carried out correctly by comparing the moved blocks to the original blocks.

FIB$V_CHANGE_VOL
Enables the movefile operation to move blocks from one volume to another within a volume set.

The movefile operation clears this flag if the specified file is a directory.
FIB$W_FID

Specifies the file identification of the file to be moved.
FIB$W_EXCTL

Movefile control flags. The following flag applies to the movefile operation. All other FIB$W_EXCTL flags must be clear.

FIB$V_ALCON
Specifies that the movefile operation must allocate contiguous disk space to the moved blocks. If the necessary contiguous space is not available, the movefile operation fails.

The movefile operation sets this flag if the file was previously marked as contiguous.

FIB$V_ALCONB
Specifies that the movefile operation should attempt to allocate contiguous disk space to the moved blocks. That is, if the movefile operation cannot allocate contiguous space to all the moved blocks, it allocates contiguous space to as many of the blocks as possible.

The movefile operation sets this flag if the file was previously marked as contiguous best try.

FIB$V_FILCON
Specifies that the entire file must be made contiguous. Do not set this flag without also setting the FIB$V_ALCON flag.

If the FIB$V_FILCON flag is set, and either the FIB$V_ALCON flag is clear or the file would not be made contiguous by moving the specified virtual blocks, the movefile operation fails.

The movefile operation sets this flag if the file was previously marked as contiguous.

FIB$V_NOPLACE
Specifies that placement information will not be recorded in the file header.

If this flag is clear and you specify exact placement for the moved blocks, placement information for those blocks will be recorded in the file header. If this flag is set, the placement information will not be recorded.

You specify exact placement through the FIB$V_EXACT, FIB$C_LBN, and FIB$L_LOC_ADDR fields.
FIB$B_ALOPTS

Flags that control the placement of the allocated blocks. Currently, only the FIB$V_EXACT flag applies to the movefile operation. All other FIB$B_ALOPTS flags must be clear. The following flag is applicable:

FIB$V_EXACT
Set to require exact placement. If this flag is set and the specified blocks are not available, the movefile operation fails.
FIB$B_ALALIGN

Contains the interpretation mode of the allocation field (FIB$W_ALLOC). You can specify a field value of 0 or you can specify the symbolic value FIB$C_LBN. If you specify 0, the allocation field is ignored.
FIB$W_ALLOC

Contains the desired location of the blocks being allocated. Interpretation of the field is controlled by the FIB$B_ALALIGN field. The following subfields are defined:

FIB$B_LOC_RVN
Specifies the relative volume number (RVN) of the volume to which the blocks are moved. Do not specify a value for this field unless you have set the FIB$V_CHANGE_VOL flag.

FIB$L_LOC_ADDR
If the FIB$C_LBN and FIB$V_EXACT flags are set, specifies the starting logical address to which the blocks are moved.
FIB$L_MOV_SVBN

Specifies the virtual block number (VBN) of the first block to be moved.

The starting VBN must correspond to the first block of a disk cluster. The value must be greater than 0 and it must not exceed the number of virtual blocks allocated to the file. If you specify an invalid value, the movefile operation fails.
FIB$L_MOV_VBNCNT

Specifies the number of consecutive virtual blocks to be moved.

This value must be a multiple of the disk cluster size, and it must not exceed the difference between the greatest VBN allocated to the file and the FIB$L_MOV_SVBN value. If you specify a value of 0, the movefile operation moves all the virtual blocks between the FIB$L_MOV_SVBN value and the greatest VBN.

If you specify an invalid value, the movefile operation fails.

Operation    

A program can perform a movefile operation on a file if the following conditions are met:

The movefile operation moves a specified number of consecutive virtual blocks to new logical blocks on disk, beginning with the virtual block specified in the FIB$L_SVBN field.

The number of blocks moved is specified in the FIB$L_VBNCNT field. To move an entire file, specify FIB$L_VBNCNT as 0 and FIB$L_SVBN as 1.

To specify a starting logical block for the moved blocks, specify the logical block address in the FIB$L_LOC_ADDR subfield and set the FIB$C_LBN and the FIB$V_EXACT flags.

To move the blocks to another volume, or move blocks that span more than one volume, set the FIB$V_CHANGE_VOL flag of the FIB$L_ACCTL field. Use the FIB$B_LOC_RVN subfield of the FIB$W_ALLOC field to specify the volume to which the blocks are moved. If you do not specify a volume, the blocks are moved to the volume containing the first virtual block. Note that you cannot move blocks of a directory file to another volume.

If the file was previously marked as contiguous, the movefile operation sets the FIB$V_ALCON, FIB$V_ALCONB, and FIB$V_FILCON flags. This ensures that a contiguous file is not fragmented by a movefile operation.

For virtual blocks beyond the file's highwater mark, the movefile operation allocates new logical blocks but does not copy the contents. The position of the file's highwater mark remains unchanged.

Mount 

On VAX, Alpha, and I64 systems, mount is a virtual I/O function that informs the ACP when a disk or magnetic tape volume is mounted. MOUNT privilege is required.

IO$_MOUNT takes no arguments or function modifiers. This function is part of the volume mounting operation only, and it is not meant for general use. Most of the actual processing is performed by the MOUNT command or the Mount Volume ($MOUNT) system service.

ACP Control  

ACP Control is a virtual I/O function that performs ancillary control functions, depending on the arguments specified.

The following is the function code:

The following is the function modifier:

Input Parameters  

The following are the device- or function-dependent arguments for IO$_ACPCONTROL:

IO$_ACPCONTROL and the FIB lists FIB fields that control the processing of the IO$_ACPCONTROL function.

Table 14   IO$_ACPCONTROL and the FIB
Field Subfields Meaning
FIB$W_CNTRLFUNC

Specifies the control function to be performed. This field overlays FIB$W_EXCTL.
FIB$L_CNTRLVAL1

Specifies additional function-dependent data. This field overlays FIB$L_EXSZ.
FIB$L_ACL_STATUS

Status of the requested ACL attribute operation, if any. The ACL attributes are included in ACP-QIO Attributes. If no ACL attributes are given, SS$_NORMAL is returned here. For Files-11 C/D, this field is always set to SS$_NORMAL.
FIB$L_STATUS

Alternate access status. The following bits are supported:

FIB$V_ALT_REQ
Set to indicate whether the alternate access bit is required for the current operation. If not set, the alternate access bit is optional.

FIB$V_ALT_GRANTED
If FIB$V_ALT_REQ = 0 and the alternate access check succeeded, the FIB bit returned from the file system is set.
FIB$L_ALT_ACCESS

A 32-bit mask that represents an access mask to check against file protection; for example, to open a file for read and to check whether it can be deleted or not. The mask has the same configuration as the standard protection mask.

Magnetic Tape Control Functions  

Magnetic Tape Operations and the FIB lists the FIB field applicable to magnetic tape operations.

Table 15   Magnetic Tape Operations and the FIB
Field Subfields Meaning
FIB$W_CNTRLFUNC

Several ACP control functions are used for magnetic tape positioning. These functions are specified by supplying a FIB with P1 containing the FIB descriptor address. Modifiers and parameters P2, P3, and P4 are not allowed. These functions clear serious exceptions in magnetic tape drivers. The following control functions can be specified to control magnetic tape positioning:

FIB$C_REWINDFIL
Rewind to beginning-of-file.

FIB$C_REWINDVOL
Rewind to beginning-of-volume set.

FIB$C_POSEND
Position to end-of-volume set.

FIB$C_NEXTVOL
Force next volume.

FIB$C_SPACE
Space n blocks forward or backward. The FIB$L_CNTRLVAL field specifies the number of magnetic tape blocks to space forward if positive or to space backward if negative.

FIB$C_CLSEREXCP
If set, clears the serious exception in the magnetic tape driver (see FIB$C_USEREOT in Create File and Access File). If writing, allows you to write data blocks beyond the EOT marker, which can result in the magnetic tape not conforming to the ANSI standard for magnetic tapes (see ANSI Standard X3.27-1978). If reading, allows you to handle the move to the next volume or to stop reading the tape. Do not attempt to read past EOV.

Miscellaneous Disk Control Functions  

Several ACP control functions are available for disk volume control. The following function does not use parameters P2, P3, and P4:

IO$M_DMOUNT
Specifying the dismount modifier on the IO$_ACPCNTRL function executes a dismount QIO. No parameters in the FIB are used; the FIB can be omitted. This function does not perform a dismount by itself, but is used to synchronize the ACP with the DISMOUNT command and the Dismount Volume ($DISMOUNT) system service.

The FIB$W_CNTRLFUNC field of the FIB specifies the following miscellaneous control functions (with no modifier on the IO$_ACPCONTROL function code). These functions use no other parameters.

FIB$C_REMAP
Remap a file. The file window for the file open on the user's channel is remapped so that it maps the entire file.
FIB$C_LOCK_VOL
Allocation lock the volume. Operations that change the file structure, such as file creation, deletion, extension, and deaccess, are not permitted. If such requests are queued to the file system for an allocation-locked volume, they are not processed until the FIB$C_UNLK_VOL function is issued to unlock the volume.

To issue the FIB$C_LOCK_VOL function, you must have either a system UIC or SYSPRV privilege, or be the owner of the volume.
FIB$C_UNLK_VOL
Unlock the volume. Cancels FIB$C_LOCK_VOL. To issue this function, you must have either a system UIC or SYSPRV privilege, or be the owner of the volume.

Disk Quotas  

Disk quota enforcement is enabled by a quota file on the volume, or relative volume 1 if the file is on a volume set. The quota file appears in the volume's master file directory (MFD) under the name QUOTA.SYS;1. This section describes the control functions that operate on the quota file.

Disk Quota Functions (Enable/Disable) lists the enable and disable quota control functions.

Table 16   Disk Quota Functions (Enable/Disable)
Value Meaning
FIB$C_ENA_QUOTA
Enable the disk quota file. If a nonzero directory file ID is specified in FIB$W_DID, a lookup subfunction is performed to locate the quota file (see Directory Lookup). To issue this function, you must have either a system UIC or SYSPRV privilege, or be the owner of the volume.

The quota file specified by FIB$W_FID, if present, is accessed by the ACP, and quota enforcement is turned on. By convention, the quota file is named [0,0]QUOTA.SYS;1. Therefore, FIB$W_DID should contain the value 4,4,0 and the name string specified with P2 should be "QUOTA.SYS;1".
FIB$C_DSA_QUOTA
Disable the disk quota file. The quota file is deaccessed and quota enforcement is turned off. To issue this function, you must have either a system UIC or SYSPRV privilege, or be the owner of the volume.

Disk Quota Functions (Individual Entries) lists the quota control functions that operate on individual entries in the quota file. Each operation transfers quota file data to and from the ACP using a quota data block. This block has the same format as a record in the quota file. Quota File Transfer Block shows the format of this block.

Table 17   Disk Quota Functions (Individual Entries)
Value Meaning
FIB$C_ADD_QUOTA
Add an entry to the disk quota file, using the UIC and quota specified in the P2 argument block. FIB$C_ADD_QUOTA requires write access to the quota file.
FIB$C_EXA_QUOTA
Examine a disk quota file entry. The entry whose UIC is specified in the P2 argument block is returned in the P4 argument block, and its length is returned in the P3 argument word. Using two flags in FIB$L_CNTRLVAL, it is possible to search through the quota file using wildcards. The two flags are:

FIB$V_ALL_MEM
Match all UIC members

FIB$V_ALL_GRP
Match all UIC groups

The ACP maintains position context in FIB$L_WCC. On the first examine call, you specify 0 in FIB$L_WCC; the ACP returns a nonzero value so that each succeeding examine call returns the next matching entry.

Read access to the quota file is required to examine all nonuser entries.
FIB$C_MOD_QUOTA
Modify a disk quota file entry. The quota file entry specified by the UIC in the P2 argument block is modified according to the values in the block, as controlled by the following three flags in FIB$L_CNTRLVAL:

FIB$V_MOD_PERM
Change the permanent quota

FIB$V_MOD_OVER
Change the overdraft quota

FIB$V_MOD_USE
Change the usage data

The usage data can be changed only if the volume is locked by FIB$C_LOCK_VOL (see Miscellaneous Disk Control Functions). FIB$C_MOD_QUOTA requires write access to the quota file.

The P3 and P4 arguments return the modified quota entry to you.

By using the flags FIB$V_ALL_MEM and FIB$V_ALL_GRP, you can search through the quota file using wildcards just as you would with the FIB$C_EXA_QUOTA function.
FIB$C_REM_QUOTA
Remove a disk quota file entry whose UIC is specified in the P2 argument block. FIB$C_REM_QUOTA requires write access to the quota file.

The P3 and P4 arguments return the removed quota file entry to you.

By using the flags FIB$V_ALL_MEM and FIB$V_ALL_GRP, you can search through the quota file using wildcards just as you would with the FIB$C_EXAQUOTA function.

 

Figure 7  Quota File Transfer Block  
Quota File Transfer Block

IO$_ACPCONTROL functions that transfer quota file data between the caller and the ACP use the following device- or function-dependent arguments:


Footnotes
1Not supported or valid for Files-11 C/D.

( Number takes you back )


go to previous page: ACP-QIO Attributes Statistics Block ACP-QIO Attributes Statistics Block
go to next page: I/O Status BlockI/O Status Block