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

CLRST. [CALLI 134]
22.13 CLRST. [CALLI 134]
FUNCTION
Clears or sets the I/O status bits for a device. This enables your
program to continue after an I/O error has occurred. The CLRST. UUO
functions like SETSTS, taking the list of devices and I/O status bits
for each device, with the additional ability to specify devices not
explicitly OPENed on an I/O channel.
You can examine the current setting of the I/O status bits by
the SENSE. monitor call.
using
CALLING SEQUENCE
MOVE ac, [XWD len,addr]
CLRST. ac,
error return
skip return
..
/ SIXBIT/device/ \
addr: I EXP channo I
\ EXP udx /
addr+l: XWD O,setsts-value
/ SIXBIT/device/ \
addr+2: I EXP channo I
\ EXP udx /
addr+3: XWD O,setsts-value
In the calling sequence, you can supply the following information:
o
len is the length of the argument list.
o addr is the address of the argument list, containing one or
more 2-word entries. Each two-word entry contains the
following information:
o In the first word of the pair (.CLRSX), store
specification, in the form of a SIXBIT device name,
a channel number, or the device udx.
a device
channo as
o In the second word of the pair (.CLRST), store the
setsts-value, or the halfword value of the I/O status nits
for the given device, channel, or udx. This word specifies
the new settings for the I/O status bits.
Your program can clear the I/O status bits for more than one
The argument block contains a 2-word entry for each device.
device.
For a complete list of I/O status bits, see Chapter 11. Each type of
device has a unique set of I/O status bits, which are described in the
chapter about the appropriate device.
SKIP RETURN
The I/O status bits for each specified device are cleared or set as
specified.
22-27