event_notifier: add event_notifier_set_handler
Win32 event notifiers are not file descriptors, so they will not be able to use qemu_set_fd_handler. But even if for now we only have a POSIX version of EventNotifier, we can add a specific function that wraps the call. The wrapper passes the EventNotifier as the opaque value so that it will be used with container_of. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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