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121729a3b0
The VM specific signal (currently only SIGWINCH) should only be handled
when the VM is running.
The generic VMM signals (SIGINT and SIGTERM) need handling at all times.
Split the signal handling into two separate threads which have differing
lifetimes.
Tested by:
1.) Boot full VM and check resize handling (SIGWINCH) works & sending
SIGTERM leads to cleanup (tested that API socket is removed.)
2.) Start without a VM and send SIGTERM/SIGINT and observe cleanup (API
socket removed)
3.) Boot full VM, delete VM and observe 2.) holds.
4.) Boot full VM, delete VM, recreate VM and observe 1.) holds.
Fixes: #4269
Signed-off-by: Rob Bradford <robert.bradford@intel.com>