463aef23a7
Before this patch, there was no way to request all running user instances for reexecuting. However this can be useful especially during package updates otherwise user instances are never updated and keep running a potentially very old version of the binaries. Now assuming that we have enough priviledge, it's possible to request reexecution of all user instances: systemctl kill --signal=SIGRTMIN+25 "user@*.service" Note that this request is obviously asynchronous as it relies on a signal. Keeping "systemctl kill" as the only interface should be good enough to make this obvious and that's the reason why another interface, such as "systemctl --global daemon-reexec" has not been considered. PID1 already uses SIGTERM for reexecuting hence sending it SIGRTMIN+25 is a nop.
System and Service Manager
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