Re: OpenVMS - Remot emailbox (Decnet)
From: John Santos (JOHN_at_egh.com)
Date: 07/15/03
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Date: Tue, 15 Jul 2003 03:52:13 -0400
On Tue, 15 Jul 2003, Jean Mertens wrote:
> What is surprising is that the following is working:
>
> 1) From NodeA $CREMBX mail box NODEA_MBX (logical name) as permanent
> 2) Define proxy on NodeA user A to point to NodeB user B
> 3) From NodeB in DCL
> DCL>OPEN/WRITE tmp NodeB::NODEA_MBX
> DCL> WRITE tmp "hello there this is remote node B"
> DCL> CLOSE tmp
>
> NodeA receives in NODEA_MBX the string : hello there this is remote node B
>
> The same works with pure Fortran Open and Write if the file name is
> NodeB::"NODEA_MBX" with the mail box logical name
> between to double quotes.
>
> It must be an undocumented VMS feature ....
This is not undocumented. DCL uses RMS. RMS supports DECnet remote
file access (DAP protocol.) When DCL on NodeB opens a remote file,
RMS automatically creates a decnet file server process on NodeA to
do the I/O. RMS on NodeA knows how to read/write local devices as
well as files, so it can write to the mailbox on NodeA.
Fortran and other high-level languages use RMS, so they can do the
same thing as DCL.
CREMBX, ASSIGN/DEASSGN, QIO(W), etc. operate at the driver level
and thus can only talk to local devices.
(Some drivers create virtual devices that implement network
interfaces. For example, the BG driver implements the TCP/IP socket
interface. But this isn't really an exception, since you can only
do I/O to a BG device on your local system, not to one on another
system. The BG driver handles transporting the data to/from the
other system transparently to the application.)
It's like the difference between the presentation layer and the
physical layer in the ISO network model.
>
> Thanks anyway. I'll go and try the tas to task
-- John Santos Evans Griffiths & Hart, Inc. 781-861-0670 ext 539
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