[Info-vax] Job logicals linked to a process

[Stephen Hoffman]

On 2021-01-08 22:24:33 +0000, Chris Townley said:

> Just wondering - looking at job logicals, where the LNM table is 
> similar to LNM$JOB_81DC4940
> 
> I was wondering how to link a process to a particular table. Looking at 
> the the reference above, here 81DC4940, I could not see the connection 
> until I looked at SDA, where this is shown as the JIB address.
> 
> I cannot find this in f$getjpi (so presumably not in LIB$GETJPI or even $GETJPI
> 
> Any thoughts on how to find/link this, or even what it is?

Ignore my previous link.

It's the job information block JIB address, in hexadecimal.

AFAIK, there's no supported means to locate the name of a process' 
LNM$JOB, but there are hack-ish means.

Best to use your own shared logical name table, if you need to share 
some sort of data.

This gets discussed occasionally.

https://groups.google.com/g/comp.os.vms/c/JF9CD3GsrEU/m/8PTZKpYy3FoJ
https://groups.google.com/g/comp.os.vms/c/JvayAq2U3JU/m/C95h2FeWdPAJ
https://groups.google.com/g/comp.os.vms/c/al6XGcd1ZUk/m/LpvPbE2ddYUJ
https://groups.google.com/g/comp.os.vms/c/jl04QQb02IA/m/Qq4N2LPtTRYJ
etc.

I'm skeptical about using logical names for much of what they tend to 
get (mis)used for—pretty much anything other than a device or file or 
file path—but others are quite fond of this approach.
One of the more common mis-uses: configuration data is best stored in a 
configuration file. I've used this myself as it's relatively quick and 
easy, and have often come to regret the results.


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