Re: Public virErrorPreserveLast()/virErrorRestore()

These two functions are currently private to libvirt, hence not available to consumers. Would it be possible to make them public? Without them, there's no way to do any libvirt call without stomping on an existing error that you may want to preserve. I have multiple threads sharing a remote connection (to local libvirtd). I need to be able to handle connection drops (e.g. libvirtd restart). Long story short, the only approach I've found that actually works properly is that there's one main conn object, each thread has a virConnectRef() to it, and whenever a thread gets an error, we check in the error callback if !virConnectIsAlive(). If so, we close the thread's conn, and potentially also clean up the main conn. Then when the error gets returned from the relevant library call, we try to re-connect. However, virConnectIsAlive() stomps on the thread's error, meaning we lose the context on a real, non-connection-related error. So I need to be able to save and restore in the error handler. Given how much these are used inside libvirt code already, it feels likely it would be useful in other public cases too. Thoughts?