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

MVHDR. [CALLI 131]
22.106 MVHDR. [CALLI 131]
FUNCTION
Allows you to move the buffer ring control block for an initialized
channel from one location to another. This move is accomplished by
changing the monitor's pointer to the ring control block.
CALLING SEQUENCE
MOVE I ac,channo
MOVE ac+1, [XWD outring,inring]
MVHDR. ac,
error return
skip return
In the calling sequence, the program supplies the following variables:
o
o
o
channo is the number of an initialized channel.
outring is the new address of the output buffer ring control
block, or O.
inring is the new address of the input buffer ring control
block, or O. outring and inring must be in your current low
segment.
SKIP RETURN
If you give 0 as the address of either buffer ring control
block, the address is not changed.
The pointers to the specified control blocks are changed.
ERROR RETURN
The following error code is returned in the ac:
Code
1
Symbol
MVHDR%
Error
Channel not initialized.
Ii you specify an illegal address, the monitor halts your job and
displays the following error message:
?Illegal address in UUO at user PC nnnnnn
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