Remote Files
Whether
or
not
a minidisk is really local
or
remote, once you
have performed
LINK
and
ACCESS,
you
can
access files
on
that
disk using CMS
and
user-written programs.
That
is, you
have
the
full range
of
CMS file commands
at
your
disposal.
At
a high level, you
can
invoke
an
editor,
to
edit
and
modify
any file; you
can
TYPE
out a given file;
you
can
COPYFILE
any
file;
or
you
can
compile a program. These
commands are available
to
you even if
the
files exist
on
a
remote minidisk (in such cases we call
the
files remote).
At
a low level, you have available
to
you
all
of
the
CMS file
system macros, such as:
l.
FSCB
2.
FSOPEN
3.
FSSTATE(W)
4.
FSREAD
5.
FSWRITE
6.
FSPOINT
7.
FSCLOSE
You
can
use these macros in your programs
to
read
and
write
data
in
both
remote
and
local files, without
the
application
program having
to
be
aware
of
where
the
file is actually
located.
Some applications which are
dependent
on
certain
CMS control blocks
and
internal pointers
may
not
work.
For
example, applications which search internal CMS control
blocks for a file's
FST
may
not
work correctly.
Also,
any
single
read
or
write
of
data
that
your
applications
perform must
be
less
than
or
equal
to
65535
bytes.
Therefore, you should
not
read
or
write
remote
files with a
record length greater
than
65535,
or
try
to
read
or
write
more
than
65535
bytes
of
a remote file with a single file
system operation.
6-12
VM/PC
Users Guide
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