Re: Determining display device for a process

Jan-Erik Söderholm wrote:
Bobby wrote:
I have a need to determine the device that an x-application is
"displaying" to. The reason is that an x-application will be
automatically loaded at user login, but should only be started once
per display (i.e., once per x-server display). The logical decw
$display points to the device, but how (can?) this value be retrieved
for a specific process? I didn't see anything in the f$getjpi()
function, but maybe I missed something. The same user account is used
for multiple stations, so looking at the UIC for the owner of a
process won't work. Any ideas would be appreciated.

All logical name tables (incl the LNM$JOBxxxx tables) are
available to F$TRNLNM, if you have read access to them.
So one should be able to scan through the LNM$JOBxxx
tables for a specific "display".

See :
SHOW LOG /STRU
SHOW LOG /TABLE=LNM$SYSTEM_DIRECTORY
SHOW LOG /TABLE=LNM$SYSTEM_DIRECTORY/DESCENDANTS

Ex:
SHOW LOG /DESCENDANTS/TABLE=LNM$SYSTEM_DIRECTORY DECW$DISPLAY
will show all currently defined DEC-Windows displays
for all processes on the system.

Output to a file and search for your actual device, or
make something up with PIPE or whatever...

Regards,
Jan-Erik.

Jan-Erik,

This looks pretty interesting! Could you expand on this technique a little, please? One area of difficulty here is
easily determining the graphics output screen for x-applications
when we do a SET HOST from an X-window Decterm. Naturally we
want the x-display for the session on the remote host to default
to the device that was serving the x-decterm window from which
we did the Set Host.

I wonder if you, or anyone on cov, could walk us through what to do.

Thanks.

. fred bach . music at triumf dot c a


.

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