How to detect "no ethernet cable" in QNX 6.5 ?

QNX USERS QNX6 - Applications
1

I can detect the ethernet cable status by devctl() and data.flags=NIC_FLAG_LINK_DOWN.
How to detect “no ethernet cable” in QNX 6.5 ?

2

That would have to be provided on a driver by driver basis. The drivers I’ve seen did not support this.