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the required MVS command is provided as input to the macro, and the OSCMD
service issues an SVC 34 specifying this command text. In addition, the OSCMD
service issues an MVS WTO request so that a copy of the command text appears
on the MVS console to keep the operator informed of what is about to happen. This
copy has the comment ‘(BY IOP)’ appended to show that the command is going to
be issued by an overseer program. A second copy of the command text is sent to
the console when the MVS command is issued.
Input
The PARM value is a single address that points to a “command area”. The
command area is made up of a 4-byte length field followed by the command
data. The length field contains the length of the whole command area. The
command data must be in write-to-operator (WTO) command format.
The TOKEN value is the ENTRY token.
Output
Register 0
Completion code set by SVC 34 as a response to the MVS command
that was issued by the macro.
Register 15
Response to the macro itself. A return code of ‘16’ indicates that the
OSCMD has failed.
DFHWOSM FUNC=READ macro
The DFHWOSM FUNC=READ macro returns information about a named generic
applid from its associated CAVM data sets.
Input
The PARM value is a pointer to a parameter list that contains the addresses of
the generic applid and the “dbllist”. The dbllist is a list of one or more
doublewords.
In the first two bytes of the second word of each of these doublewords you
supply the DBLID of the information you require. Each piece of information that
you can request is identified by a DBLID, and a list of these is provided in
Figure 51 on page 620.
The first word of each doubleword is an output area to contain the address of
the requested information, and the last two bytes of the second word of each
doubleword contain the length of the information. The end of the dbllist is
signaled by setting the high-order bit of the last doubleword to ‘1’. Figure 50 on
page 620 illustrates the input to and output from the READ macro.
The TOKEN value is the BUILD token.
label DFHWOSM FUNC=OSCMD
[,PARM={parm address|1}]
[,TOKEN={token register|14}]
label DFHWOSM FUNC=READ
[,PARM={parm address|1}]
[,TOKEN={token register|14}]
DFHWOSM macros
Chapter 22. The extended recovery facility overseer program 619