When I use the home function to zero all the axes, I can't manipulate the jog mo

look at hal_glib
github.com/LinuxCNC/linuxcnc/blob/2.8/lib/python/hal_glib.py

It has a function: do_jog.(self, axisnum, direction, distance=0)

You could use the hal_glib library in your code of just use it as an example.

I use GTK. I think the link you sent me seems to be QT. I don't know if it is universal,
Thank you very much for your reply

hal_glib is not qt only code.

it's used by gtk and qt.

If you look at the function I quoted you should be able to figure it out.