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'alarm' is used to schedule an additionaly cleanup round 5 seconds after sending SIGTERM via terminate_client. This then sends SIGKILL via a pidfd (if supported by the kernel) or directly via kill, making sure that the QEMU process is *really* dead and won't be left behind in an undetermined state. This shouldn't be an issue under normal circumstances, but can help avoid dead processes lying around if QEMU hangs after SIGTERM. Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>