.D - Display an OS/2 System Structure

Display an OS/2 System Structure.

Syntax:

────.D ─────┬── SFT   ──┬───────── addr ──────────────────────
              ├── VPB   ──┤
              ├── DPB   ──┤
              ├── CDS   ──┤
              ├── KSEM  ──┤
              ├── DT    ──┤
              ├── DEV   ──┤
              ├── REQ   ──┤
              ├── MFT   ──┤
              ├── BUF   ──┤
              ├── BPB   ──┤
              ├── SEM32 ──┤
              ├── MUXQ  ──┤
              └── OPENQ ──┘

Parameters:

structure

The structure type may take one of the following values:

SFT

Format a file system System File Table entry.
VPB
Format a file system Volume Parameter Block.
DPB
Format a file system Drive Parameter Block.
CDS
Format a file system Current Directory Structure.
KSEM
Format a Kernel Semaphore.
DT
Disk Trace in now obsolete.
DEV
Format a device driver header.
REQ
Format a device driver request packet.
MFT
Format a Master File Table entry.
BUF
Format a file system I/O buffer.
BPB
Format a BIOS Parameter Block.
SEM32
Format a 32-bit semaphore.
MUXQ
Format a mutex semaphore wait queue.
OPENQ
Format a 32-bit semaphore open queue.
addr
Specifies the address of the structure to be formatted. If omitted then the current DS selector value, offset 0 is assumed.

An address expression may be specified.

Results & Notes:

Warning:

.D will format OS/2 structures without any validation. It is entirely incumbent on the user to ensure that the address used does in fact point to the named structure. Failure to observe this caution will result in meaningless information being displayed.

The following are examples of each of the 13 formatted structures. Refer to the System Reference for a description of each formatted structure.

SFT

System File Table Entry
VPB
Volume Parameter Block
DPB
Drive Parameter Block
CDS
Current Directory Structure
KSEM
Kernel Semaphore
DEV
Device Driver Header
REQ
Device Driver (Strategy 1) Request Packet
MFT
Master File Table Entry
BUF
File System Buffer
BPB
BIOS Parameter Block
SEM32
32-Bit Semaphore
MUXQ
Semaphore MUX Queue
OPENQ
Semaphore Open Queue

Note:

The Dump Formatter prior to fix pack 29 for Warp V3 did not format structures contained in segments less than 512 bytes, typically .D DEV and .D DPB. This is fixed from fix pack 29 of Warp V3 and base Warp V4.

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