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This defines a new RPC protocol to be used between the LXC controller and the libvirtd LXC driver. There is only a single RPC message defined thus far, an asynchronous "EXIT" event that is emitted just before the LXC controller process exits. This provides the LXC driver with details about how the container shutdown - normally, or abnormally (crashed), thus allowing the driver to emit better libvirt events. Emitting the event in the LXC controller requires a few little tricks with the RPC service. Simply calling the virNetServiceClientSendMessage does not work, since this merely queues the message for asynchronous processing. In addition the main event loop is no longer running at the point the event is emitted, so no I/O is processed. Thus after invoking virNetServiceClientSendMessage it is necessary to mark the client as being in "delayed close" mode. Then the event loop is run again, until the client completes its close - this happens only after the queued message has been fully transmitted. The final complexity is that it is not safe to run virNetServerQuit() from the client close callback, since that is invoked from a context where the server is locked. Thus a zero-second timer is used to trigger shutdown of the event loop, causing the controller to finally exit. * src/Makefile.am: Add rules for generating RPC protocol files and dispatch methods * src/lxc/lxc_controller.c: Emit an RPC event immediately before exiting * src/lxc/lxc_domain.h: Record the shutdown reason given by the controller * src/lxc/lxc_monitor.c, src/lxc/lxc_monitor.h: Register RPC program and event handler. Add callback to let driver receive EXIT event. * src/lxc/lxc_process.c: Use monitor exit event to decide what kind of domain event to emit * src/lxc/lxc_protocol.x: Define wire protocol for LXC controller monitor. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
191 lines
3.3 KiB
Plaintext
191 lines
3.3 KiB
Plaintext
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