Run G-Code on application shutdown

I rapidly search on axis doc but didn't find a way to run g-code on application shutdown to park spindle for ex.

I guess there is some trick in .axisrc with something likeroot_window.tk.call("wm","protocol",".","WM_DELETE_WINDOW","destroy .")but don't know which syntax to use, does anybody have an idea ?

Never tried this but pretty sure the Axis way will not work, maybe this will: Notice the last line, i suppose you could add something there, but i do not know what or how.

That will only run HAL commands on shutdown.

It's gui screen specific and probably undocumented or not accounted for.
Sounds li8ke you sre using AXIS and that would be not accounted for.
The .axisrc would be the way to try besides changing the source code.

Others like QtDragon or QtAxis (aka Qtvcp) would be a bit easier because they cater to modifications.

axis.py      trying to change the function like this :

def General_Halt():
    text = _("The machine will be parked.\nDo you mind?")
    if not root_window.tk.call("nf_dialog", ".error", _("Confirm Close"), text, "warning", 1, _("Yes"), _("No")):
        print "o<before_go>call"
        ensure_mode(linuxcnc.MODE_MDI)
        c.wait_complete()            
        c.mdi("o<before_go>call")      
        c.wait_complete()
        root_window.destroy()
=====================================================
checked with such a file 

before_go.ngc:

o<before_go>sub

g0 x111 y222

G10 L20 P1 X1.5

o<before_go>endsub
m2

Thank you for pointing me in the right direction.

I achieved that goal with the following in .axisrc :
And the macro as suggested

Just a stupid question, would it be more useful to park the spindle with a remap of m2 / M30?

I usually stop the machine before shutting down linuxcnc. Then none of the drives would have power to park the spindle.

I was one searching for something similar and yet quite different. I antes to send a signal to my air compressor to power off, when leaving linuxcnc. In the end I used a python hal component and send the signal on exit.