TOPS-10 Monitor Calls Manual Volume 2 AA-K039D ... - Trailing-Edge

FILOP. [CALLI 155]
1 .FOIOS
2 . FODEV
3 . FOBRH
I/O status (open mode). Note that any bits
appearing here may also be set by OPEN call (see
.OPMOD in OPEN call) .
SIXBIT device name or Universal Device Index.
Buffer ring header pointers:
Bits
0-17
18-35
Meaning
Address of output buffer ring header.
Address of input buffer ring header.
If the value of this word is 0, there is no
corresponding buffer ring header.
4 . FONBF
Number of buffers needed. The left half is the
number of output buffers needed. The right half
is the number of input buffers needed. If zero
buffers are requested in a FILOP. monitor call,
the monitor does not set up any buffers. It also
does not clear any buffer ring that is already set
up, and does not clear the first word of the
buffer ring header. Thus, a FILOP. causing an
OPEN allows an old buffer ring to be recycled.
This word allows a user program to set up its own
buffer ring. If you specify 777777 octal, the
monitor sets up a ring of 2 buffers for non-disk
devices. If no default has been set for this job,
the monitor uses the system default for non-disk
devices, or a ring of n buffers for disk devices,
where n is specified by the SET DEFAULT BUFFERS
monitor command or SETUUO. This argument to
FILOP. performs the same action as the INBUF and
OUTBUF monitor calls and is needed only for
buffered I/O.
5 . FOLEB
Pointers to RENAME and LOOKUP/ENTER blocks:
Bits
Meaning
0-17 Address of RENAME block (see RENAME monitor
call) .
18-35 Address of LOOKUP/ENTER block (see
LOOKUP/ENTER monitor call) .
6 . FOPAT
Length of, and pointer to PATH. block (see PATH.
monitor call). The actual path of the file found
or created is returned in this block. A specific
path for finding or creating the file must still
be specified in the LOOKUP, ENTER, or RENAME
argument block.
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