The first process created in a new PID namespace (pid_namespaces(7)) is the "init" process, for that namespace. Only signals for which the "init" process has established a signal handler can be sent to it. To run virtiofsd with '--sandbox namespace', we need to set handlers to end the child process if the parent dies. Also, in case the PID namespace is set by an external tool. Fixes #23 --- https://gitlab.com/virtio-fs/virtiofsd/-/merge_requests/75
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