Hi all,

I registe node device lifecycle event callback function after connect qemu. In the callback function, I printf the event and detail.

When I plug a USB into host, and then pull out, but there is nothing happen. The callback was not called.

Could you tell me Why? And what dose node device mean?

I want to auto-hotplug usb devices by using libvirt.

Bellow the call of libvirt:

// node device lifecycle callback function

void nodeDeviceEventLifecycleCallback(virConnectPtr conn, virNodeDevicePtr dev, int event,

int detail, void * opaque)

{

printf("event = %d, detail= %d\n", event, detail);

}

// registe node device lifecycle event

int registeNodeDevEvent()

{

int ret = virEventRegisterDefaultImpl();

if (ret) { return -1;}

ret = virConnectNodeDeviceEventRegisterAny(vmh_conn, NULL, VIR_NODE_DEVICE_EVENT_ID_LIFECYCLE,

VIR_NODE_DEVICE_EVENT_CALLBACK(nodeDeviceEventLifecycleCallback), NULL, NULL);

if (-1 == ret) { return ret;}

}

Below some information about my hypervisor:

root@ubuntu-05:/datapool/zhuohf# virsh -v
3.4.0

root@ubuntu-05:/datapool/zhuohf# qemu-x86_64 -version
qemu-x86_64 version 2.9.0
Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers