------------------------------------------<snip>------------------------------------
True confession time: I've never used DEVTYPE. Questions:
1. Is it "low overhead"? How would you guess it compares to searching the
TIOT and issuing a SWAREQ? I'm not concerned about one or two instructions
here, but I'm trying to avoid OPEN or SVC 99, for example.
2. Are there any advantages over the TIOT/SWAREQ/NULLFILE approach? I don't
think I need any other device type information, and I do already have
"search the TIOT" code.
3. Where is it documented? I don't see it in MVS Assembler Services,
Authorized Assembler Services, or DFSMS Macros.
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Charles, AFAIK DEVTYPE returns information gathered from within the
active nucleus and/or UCB list. There is no allocation or I/O involved.
DOC for DEVTYPE used to be in "Data Management for Systems Programmers",
right after the section on EXCP/XDAP. Haven't looked for it recently.
Rick
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