On Monday, 12/06/2021 at 06:10 GMT, "David Boyes" <[email protected]> 
wrote:

> 1.  Create a virtual machine SYSALERT running an application (maybe the
> existing SHUTTRAP tool) that enables an external interrupt handler and 
connects
> to *SIGNAL with a specific group id and waits for an external interrupt 
other
> than the special ones IUCV uses. Multiple copies of the SYSALERT machine 
can
> exist so long as one copy is still running and a member of the group at 
the
> time of the event.

*SIGNAL requires that you be a member of a GCS group.

You really want individual virtual machines to register for the signal so 
that QUERY SIGNALS will show meaningful status.  If I add CMS Event 
Services support the CSL routine I wrote, then PIPE (or any other program) 
can easily listen for the event.  Then, when the program is ready, it 
calls the CSL routine with the "quiesce" option.

I just need to find the time.

Alan Altmark

Senior Managing z/VM and Linux Consultant
IBM Systems Lab Services
IBM Z Delivery Practice
ibm.com/systems/services/labservices
office: 607.429.3323
mobile; 607.321.7556
[email protected]
IBM Endicott

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