How to read "Machine configuration directory" in HAL userspace component

@freisei

some pree condition:
Linuxcnc must be running;
If you start Linuxcnc then you can querry:
$   ps aux | grep "linuxcnc"

LinuxCNC starts with "/bin/bash /usr/bin/linuxcnc"

Now if you start LinuxCNC, LinuxCNC starts/calls for "halui -ini" and "io -ini"
If you querry now for
$ ps aux | grep "halui -ini"  or
$ ps aux | grep "io -ini"
then you get as return the process info along with the path;
io -ini /home/udos/linuxcnc/configs/sim.axis.gantry/gantry_mm.ini

Here the code I have used in Qt 5.15.2:

 

Maybe you can run the linuxcnc_info script?

Processes started by linuxcnc (like [DISPLAY]DISPLAY)
inherit the environmental variables 'INI_FILE_NAME'

Python example within a [DISPLAY]DISPLAY program:

import os
print(os.environ.get("INI_FILE_NAME"))

The ini setting is also available in stat() and
may be obtained from programs not started by linuxcnc
(if Run-In-PLace, source rip_environment first):

$ python -c "import linuxcnc;s=linuxcnc.stat();s.poll();print(s.ini_filename)"

Note the item namings are different (INI_FILE_NAME and ini_filename)

Thanks for the info;
@andypugh
How does that get me the path to a running linuxcnc ?
@dgarrett
I'm all in Qt and/or c++; No No No Python; what so ever;
with "The ini setting is also available in stat()" .. are you referring to NML ?
then what is the call for it ? could be used in the Lcnc_QtCpp_HMI;
What I have here is an interface into LinuxCNC/HAL in an attempt to build a Linuxcnc-IDE;
Qt 5.15.2, with Creator 8.0.1,  c++17; any help Wellcome !

Best Regards

 

> I'm all in Qt and/or c++; No No No Python; what so ever;

for environmental variables like INI_FILE_NAME:

$ man -s3 getenv

@dgarrett
there is no  "INI_FILE_NAME" or "CONFIG_DIR" in the env; Sorry.

About that stat() ?