ACP-QIO Attributes Statistics Block

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HP OpenVMS I/O User's Reference Manual

ACP-QIO Interface

ACP-QIO Record Attributes Area

Major Functions

ACP-QIO Attributes Statistics Block

ACP-QIO Attributes Statistics Block shows the format of the attributes statistics block. Contents of the Statistics Block lists the contents of this block.

Figure 6 ACP-QIO Attributes Statistics Block

ACP--QIO Attributes Statistics Block

Table 10 Contents of the Statistics Block
Field Subfields Meaning

SBK$L_STLBN

Contains the starting LBN of the file if the file is contiguous. If the file is not contiguous, this field contains a value of 0. The LBN appears as an inverted longword (the high- and low-order 16 bits are transposed for PDP-11 compatibility). The following subfields are defined:

SBK$W_STLBNH
Starting LBN (high-order 16 bits)

SBK$W_STLBNL
Starting LBN (low-order 16 bits)

SBK$L_FILESIZE

Contains the size of the file in blocks. The file size appears as an inverted longword (the high- and low-order 16 bits are transposed for PDP-11 compatibility). The following subfields are defined:

SBK$W_FILESIZH
File size (high-order 16 bits)

SBK$W_FILESIZL
File size (low-order 16 bits)

SBK$B_ACNT¹

Access count (low byte). Field is for PDP-11 compatibility.

SBK$B_LCNT

Lock count (low byte). Field is for PDP-11 compatibility.

SBK$L_FCB

System pool address of the file's file control block.

SBK$W_ACNT

Access count (number of channels with file open currently).

SBK$W_LCNT

Lock count (the number of access operations that have locked the file against writers).

SBK$W_WCN

Writer count (the number of channels that currently have the file open for write).

SBK$W_TCNT

Truncate lock count (the number of access operations that have locked the file against truncation).

SBK$L_READS

Number of read operations executed for the file on this channel.

SBK$L_WRITES

Number of write operations executed for the file on this channel.

**Table 10** **Contents of the Statistics Block**
Field	Subfields	Meaning
SBK$L_STLBN		Contains the starting LBN of the file if the file is contiguous. If the file is not contiguous, this field contains a value of 0. The LBN appears as an inverted longword (the high- and low-order 16 bits are transposed for PDP-11 compatibility). The following subfields are defined:
	SBK$W_STLBNH	Starting LBN (high-order 16 bits)
	SBK$W_STLBNL	Starting LBN (low-order 16 bits)
SBK$L_FILESIZE		Contains the size of the file in blocks. The file size appears as an inverted longword (the high- and low-order 16 bits are transposed for PDP-11 compatibility). The following subfields are defined:
	SBK$W_FILESIZH	File size (high-order 16 bits)
	SBK$W_FILESIZL	File size (low-order 16 bits)
SBK$B_ACNT¹		Access count (low byte). Field is for PDP-11 compatibility.
SBK$B_LCNT		Lock count (low byte). Field is for PDP-11 compatibility.
SBK$L_FCB		System pool address of the file's file control block.
SBK$W_ACNT		Access count (number of channels with file open currently).
SBK$W_LCNT		Lock count (the number of access operations that have locked the file against writers).
SBK$W_WCN		Writer count (the number of channels that currently have the file open for write).
SBK$W_TCNT		Truncate lock count (the number of access operations that have locked the file against truncation).
SBK$L_READS		Number of read operations executed for the file on this channel.
SBK$L_WRITES		Number of write operations executed for the file on this channel.

Footnotes

1 Accesses from processes on the local node in a cluster are counted.

( Number takes you back )

ACP-QIO Record Attributes Area

Major Functions