4. User exit does
not
use the current value in R13 as its
save area.
5. Zero register 15
on
return, else the
read
will fail.
6. User exit does
not
do any
I/O
to
user disks
(there
are
only the ones linked
by
the Local
VM/PC
available).
7. User exit preserves
and
restores any settings
of
CP,
CMS,
and
spooling
that
the
EXIT
may use before each
return
to
VMPCSERV.
8. User exit does
not
use any
of
the
CP
commands
that
will
interrupt the full screen environment.
9 . User exit does
not
issue any error messages
to
the
terminal.
10. User does
not
use any commands
or
functions
that
occupy location
X'20,000'.
11.
The
EXIT
does
not
delay the
return
to
VMPCSERV
to
interfere with
the
pacing of the two processors
(Acknowledgement is timed).
12. Uses standard CMS Macro interfaces.
It
is recommended
that
you use the
DIAGNOSE
X'4C'
to
send the user
data
to
the system defined accounting machine.
See the
VM
/
SP
System Programmer's Guide for information
on
the use
of
Diagnose
X'4C'
and
creating accounting
records.
The
HSTACC
routine
can
use
PUNCHC
and
CP
DIAGNOSE
commands
to
set up
the
environment
to
get
the
records to
other
accounting machines. (Spool classes
other
than
the default ones are suggested.) The routine
MUST
NOT
issue any commands
that
will disrupt
the
"quiet"
environment
that
is needed
to
PACE
the
two
processors.
Contents
of
Parameter
Lists: The
HSTFSR
module will pass
the
fileid
of
the file being
read
to the
HSTACC
routine in
the
following format:
6-22
VM/PC
Users Guide
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