On 21-Feb-18 05:49, Jordi Guillaumes Pons wrote: >> Or, on a reasonably recent monitor, create a pathological name. >> >> .path bcl:=dskf:[66,667] >> >> This is per-job, but may be easier as it avoids learning to do a >> mongen/monitor build. You would have to put it in any batch job that runs >> bcpl. >> > Is that (‘pathological’) the “official” name? > > Curiously enough, IBM refers to a similar thing in MVS/zOS as “esoteric”. > > Jordi Guillaumes i Pons > j...@jordi.guillaumes.name > HECnet: BITXOW::JGUILLAUMES > > Yes. Simple logical names existed for a very long time. They provide an alias for a device, and are associated with that device with .ASSIGN or .MOUNT commands. They live in the DDB; a device can have no more than one. They don't allow associating a filename or any filesystem attributes with the name.
Pathological names, stored in funny space, are more recent and much more powerful. They provide a search list of one or more device/directories, can provide filenames and/or filename defaults, and can be specified as an extension to the "default working directory". Any number of pathological names can refer to a single device. See the PATH. UUO, where the term is used in the documentation. The PATH. UUO functions are documented, but the path command that accesses them is not. This was a budget/political issue with documentation resources. The path utility may have been shipped as "customer supported", but was heavily used internally. Before you ask: Yes, "funny space" is also a technical term for per-job (process) executive virtual memory. Originating with the KI10 hardware, it's an area of the monitor's address space (32 pages) mapped through the USER page table. This means that it is automagically context switched; the monitor can reference job-specific data at the same exec virtual address. Funny space is used to map frequently accessed context, such as the running program's job data area (a user space page) and per-job monitor pages (such as the pool from which pathological names are allocated). In the KL10, the same effect is achieved with indirect page pointers. "Funny" is used in the sense of "unusual", not "humorous". The effect is that a monitor virtual address doesn't always refer to the same memory; the target is context sensitive.
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