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How does PathPilot know what Python files to start?

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7 years 9 months ago #124697 by jwatte
How does PathPilot know what Python files to start? was created by jwatte
When I do a `ps` on the PathPilot controller, it looks as so:
Code:
0 1001 1867 1444 20 0 541952 39412 poll_s Sl ? 0:00 /usr/bin/python /usr/bin/blueman-applet 0 1001 2147 1878 20 0 203200 39996 wait S ? 0:00 python /home/operator/tmc/python/pathpilotmanager.py 0 1001 2195 2147 20 0 0 0 task_d Z ? 0:00 [python] <defunct> 0 1001 2264 1 20 0 232940 36128 poll_s S ? 1:12 python python/hal_zbotatc.py -n zbotatc 0 1001 2267 1 20 0 230760 35996 poll_s S ? 1:16 python python/hal_zbotschnozz.py -n zbotschnozz 0 1001 2271 1 20 0 305044 36528 poll_s S ? 1:17 python /home/operator/tmc/python/usbio.py -n usbio 0 1001 2280 2211 20 0 1953120 194712 poll_s Sl ? 907:03 python /home/operator/tmc/python/tormach_mill_ui.py -ini /home/operator/tmc/configs/tormach_mill/tormach_440.ini 0 1001 2312 1 20 0 176088 28836 poll_s S ? 1:03 python /home/operator/tmc/python/tormach_console.py -n tormach_console

Some .py files get their own processes. But I can't find any particular file or module that lists which files get this treatment, and it's not given to all .py files in the given directories.

So, how does PathPilot (or LinuxCNC) decide to start particular .py files as processes?

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7 years 9 months ago #124718 by pl7i92
Replied by pl7i92 on topic How does PathPilot know what Python files to start?
Path Pilot operates on internal C-compiler Strategie and then gose out to python scripts
THE same as FreeCAD

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7 years 9 months ago #124831 by jwatte
Replied by jwatte on topic How does PathPilot know what Python files to start?
Thanks for the answer. I understand that PathPilot is a C program using Python for embedded scripting. (Although, clearly, the different processes are actually python-main program that use C-based python modules, as witnessed by the "python" main executable for the process.)

My question is: "If I want to have PathPilot start another Python process using a script that I supply, how do I best arrange for that to happen?"
Do I need to get the C code and re-build it? Or is there some rule for which files are started as sub-processes, and I can just make my script follow that rule?

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7 years 9 months ago #124981 by jwatte
Replied by jwatte on topic How does PathPilot know what Python files to start?
To answer my own question:

I had hoped that PathPilot would just look for something like "py scripts with the x bit set in directory D" but I'm not so lucky.

The separate Python processes are created using the `loadusr` command in the v2.1.6/configs/tormach_mill/tormach_mill_mesa.hal and similar files. I don't know if PathPilot re-writes these files on each update, or whether changes made there will persist -- we shall find out.

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7 years 9 months ago #124997 by smgvbest
Replied by smgvbest on topic How does PathPilot know what Python files to start?
Pathpilot is just another GUI front end for LinuxCNC, it works the same way LinucCNC does for other other gui's
if you want to learn I started reading linuxcnc doc first them hit PP. don't try to learn PP first. linuxcnc is at it core.
Tormach but allot of work into it but it is not a full implementation of all LinuxCNC features

it a nice slick interface which is what I want myself

for your question.
PP started with ./operator_login, from there is goes the pathpilotmanager.py which is where allot more of the setup and goes and the actual launching of linuxcnc which loads all the other python scripts, once that's done it load the postgui.hal which finishes setting up all the tormach specific stuff and then things are fully up

Pathpilot replaces all files under $HOME/tmc on upgrades. remember they are supporting thier products.
i just diff my old vs new directory then apply patches to update

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7 years 9 months ago #125087 by jwatte
Replied by jwatte on topic How does PathPilot know what Python files to start?
I'm thinking I could put a script into something like .bashrc (or maybe even a unit in /etc/systemd/system) that would look for my mods, and if not there, apply them on start-up. That way, I'd know they were available after an update.
I'd also need some way to un-apply if some incompatible update comes down the pipe...

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