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

IPCFR. [CALLI 142]
SKIP RETURN
On a skip return, the monitor returns the associated variable (see
Chapter 7) in the ac indicating that there is another packet waiting
in the queue. If there are no more packets in the queue, the monitor
clears the ac. The packet retrieved from the process' input queue is
returned to--the address specified in the IPCFR. monitor call
(beginning with addr). The packet header block is filled in as
follows: ----
Word Symbol
0 . IPCFL
1 . IPCFS
2 . IPCFR
3 . IPCFP
Contents
The left half remains the same, the right. half
contains flags (see Chapter 7) .
Sender's PID .
Receiver's PID.
Length
Bits
and location of data:
Contents
0-17
18-35
Message length.
Address of message, for short-form
messages (default), or page number of
long-form messages. If the page number
refers to an existing page, error code
IPCUP% is returned.
4 . IPCFU
5 . IPCFC
Sender's PPN. If the argument block length is
less than 5, this word is not returned.
Sender's capability word:
Bits Symbol Meaning
0 IP.JAC Sending program has JACCT
privileges.
1 IP.JLG Sender is logged in.
2 IP.SXO Sender is execute-only.
3 IP.POK Sender has POKE. privilege
(JP. POK) .
4 IP.IPC Sender has IPCF privilege
(JP. IPC) .
5-17 Reserved.
18-26 IP.SCN Sender's context number.
27-35 IP.SJN Sender's job number.
If the argument block length is less than 6,
word is not returned.
this
ERROR RETURN
The packet is not retrieved and one of the following error codes
returned in the ac:
Code
1
2
3
4
5
Symbol
IPCAC%
IPCNL%
IPCNP%
IPCIU%
IPCTL%
Error
Address check.
Packet header not long enough.
No packet in receiving queue.
Page is in use (locked in core) .
Data too long for user's buffer.
is
22-189