From the manual:      z/OS     z/OS 2.1.0     z/OS MVS     z/OS MVS Diagnosis: 
Reference     System Reference     SVC summary      SVC routines     Naming 
conventions for SVC routinee

Naming conventions for SVC routines
SVC routines are load modules which are named as follows:

    The routines for SVC types 1, 2 and 6 are named IGCxxx, where xxx is the 
SVC number (decimal).
    The routines for SVC types 3 and 4 are named IGC00xxx, where xxx is the SVC 
number.

    If a type 4 SVC routine calls for multiple SVC loads, the naming convention 
is to identify each load by increasing 00 by one. For example, IGC03xxx 
indicates the third module loaded within a type 4 SVC routine.

    For types 3 and 4 SVC routines, the internal format of the SVC number (xxx) 
is zoned decimal with a four-bit sign code (1100) in the four high-order bits 
of the low order byte. Any low-order digit in a type 3 or 4 SVC number that is 
between 1 and 9 will be an EBCDIC character between A and I in the load module 
name. For example, the load module name for SVC 51 (X'33') would be IGC0005A 
because the low order byte is 1100 0001, or A in zoned decimal. A low-order 
zero in the SVC number corresponds to a hexadecimal C0 in the load module name.

    ESR type 3 routines have names in the format IGX00nnn, where nnn is the 
decimal code placed in register 15 when SVC 109 is issued

From this you can see what the convention is for naming an SVC.  Depending on 
what SVC you are looking for (TYPE1/2/3/4/6 or a Router), you would look for 
the name.  If you have a tool like MXI, SHOWMVS, Omeagmon, Sysview, SAS, etc... 
You can scan the system either live or after the fact.

If you try ISRDDN and use the LPA command then search for the module name you 
can see if it is in a library.

you might try searching the internet and see if anyone created REXX code to go 
through control blocks to display SVCs.



Lizette

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