Record and replay multiple devices at once

Submitted by Peter Hutterer @whot

Assigned to Benjamin Tissoires @bentiss

Link to original bug (#103145)

Description

For race conditions between keyboard and touchpad events (for example) we need to record multiple event logs simultaneously so they all have the same timestamps - same with replaying them later.

I'm thinking maybe: evemu-record --multiple /dev/input/event5 /dev/input/event6 and have that automatically go into event5.evemu and event6.evemu rather than stdout. And evemu-play --multiple event5.evemu event6.evemu and auto-pick the event node from the file name?

Otherwise, maybe some --multiple --device /dev/input/event5,event5.log, or something like that?