Re: [libvirt] [PATCH 4/4] Implement virDomainSendProcessSignal for LXC driver

Implement the new API for sending signals to processes in a guest for the LXC driver. Only support sending signals to the init process for now, because

- The kernel does not appear to expose the mapping between container PID numbers and host PID numbers anywhere in the host OS namespace - There is no race-free validate whether a host PID corresponds

s/race-free/race-free way to/

+ /* We're relying on fact libvirt header signal numbers + * are taken from Linux, to avoid mapping

Cute, but at least you documented your assumption. Should you validate that signum <= SIGRTMAX, though, for a nicer error than what kill() would give for out-of-range signum?