At 10:00 +0800 on 10/29/2009, David Stephens wrote about Re: What
SVCs are in use?:
What you need is to look at the SVC Table which has an entry for
every SVC (used or not). It's documented under SVCTABLE in the MVS
Data Areas. The control block chain is CVT (CVTABEND) -> SCVT
(SCVTSVCT) -> SVCTABLE
This gets the standard SVCs (0-255) but does not get the extended
SVCs (IGXxxxxx) ones that are accessed via calls to a routing SVC (I
forget the 3 SVC numbers that provide this support).
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