z/VM CP special messages uevent support

6.10 z/VM guest

The smsgiucv_app kernel device driver receives z/VM® CP special messages (SMSG) and delivers these messages to user space as udev events (uevents).

The device driver receives only messages that start with APP. The generated uevents contain the message sender and content as environment variables (see Figure 1).

This figure is described in the text preceding it — Figure 1. CP special messages as uevents in user space

You can restrict the received special messages to a particular z/VM user ID. CP special messages are discarded if the specified sender does not match the sender of the CP special message.