dev_dispatch_vm
if (vm_device_pipe(&dev, dev_dispatch_vm, NULL)) {
static void dev_dispatch_vm(int, short, void *);
if (vm_device_pipe(&dev, dev_dispatch_vm, ev_base_main)) {
static void dev_dispatch_vm(int, short, void *);
if (vm_device_pipe(&dev, dev_dispatch_vm, NULL)) {
static void dev_dispatch_vm(int, short, void *);