Basic System Problem Analysis - August 2003

File System Structures: continued

:listfile XL.PUB.SYS,-3

********************

FILE: XL.PUB.SYS

FILE CODE : 1032 FOPTIONS: BINARY,FIXED,NOCCTL,STD

BLK FACTOR: 1 CREATOR : MANAGER.SYS

REC SIZE: 256(BYTES) LOCKWORD:

BLK SIZE: 256(BYTES) SECURITY--READ : ANY

EXT SIZE: 0(SECT) WRITE : ANY

NUM REC: 77293 APPEND : ANY

NUM SEC: 77824 LOCK : ANY

NUM EXT: 41 EXECUTE : ANY

MAX REC: 4096000 **SECURITY IS ON

FLAGS : 1 ACCESSOR,SHARED,1 R

NUM LABELS: 0 CREATED : TUE, MAR 4, 2003, 10:43 AM

MAX LABELS: 0 MODIFIED: TUE, MAR 4, 2003, 10:44 AM

DISC DEV #: 1 ACCESSED: MON, MAR 17, 2003, 4:09 AM

SEC OFFSET: 0 LABEL ADDR: $00000013.$00204020

VOLNAME : MPEXL_SYSTEM_VOLUME_SET:MEMBER1

The file label address is 13.204020 and since the interval timer is found at offset $10 in

the extended label structure replacing the $20 with a $10 points us right at it.

Now, using DAT/DEBUG indirection we can pass that value to the FS_FIND_GUFD

macro:

$115 ($31) nmdebug > fs_find_gufd_entry([13.204010])

gufd_record pointer : $ca016e60

File virtual address : $f8.0

End of file offset : $12ded00

File name : XL.PUB.SYS

And as this example shows, this macro works quite well in DEBUG too.