How to add network interface using ioctl ?

I want to do what ifconfig does, but by using ioctls.
To get or set network interface address, I found some information in the if_tcp(7P) man page. I would like to know more about how to go about it. Do I have to open socket or the pseudo ethernet driver e.g hme ? What are the parameters ? Do I require to only fill the structure ifreq to set the network interface ?
Thanks in advance.
-dev

Are you trying to add a network volume or folder? I believe you can only add folders. Have you tried: Volumes/Archive, losing the first slash. I was successful in adding a group folder to the dock by using: Volumes/Groups/Example

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