Running rosrun with gdb

asked 2015-12-14 16:29:09 -0600

sykatch
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updated 2015-12-16 01:33:32 -0600

I am running this in ros:

rosrun object_recognition_capture upload -i final.bag -n 'example' example --commit

object_recognition_capture is a package and I want to run it with all these options. How can I run it with debuger, if there is any possible way to do it? The problem is that this system is c++/python hybrid. Called upload program is a python code, but it calls c++ functions. So I can't use neither gdb nor pdb.

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answered 2015-12-15 16:47:33 -0600

demmeln
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updated 2015-12-16 01:52:57 -0600

If it is a Python script I guess gdb is not what you wan to be using. Instead, Python has pdb ( https://docs.python.org/2/library/pdb... ).

You could try

rosrun --prefix 'python -m pdb' object_recognition_capture upload -i final.bag -n 'example' example --commit

but this is just a guess. I have never started Python scripts this way with rosrun.

Edit: I guess for C++ code called from python scripts you could try to run the python executable with DGB, like described here: https://wiki.python.org/moin/Debuggin...

So best install the debugging symbols for your python interpreter and then try something like this:

rosrun --prefix 'gdb -ex run --args python' object_recognition_capture upload -i final.bag -n 'example' example --commit

Again, I haven't tried this, so its just a guess.

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Thanks, I can run this upload file with pdb, but there is another problem now, I edit my question (c++/python hybrid code).

sykatch ( 2015-12-16 01:29:35 -0600 )edit

Yes, gdb runs the program now, but it runs it whole, till its end. There is no opportunity to step through the program. I'm trying to figure out what to do about it.

sykatch ( 2015-12-16 06:44:21 -0600 )edit

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Yeah this is now not so much about ROS, but rather general Python / C++ debugging. You should be able to find lots of resources on the Web.

demmeln ( 2015-12-16 07:01:26 -0600 )edit

Yes, I'll try to find something, thanks a lot.

sykatch ( 2015-12-16 09:01:34 -0600 )edit

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answered 2015-12-15 00:46:52 -0600

Mani
1694 ●9 ●30 ●36 https://mani.im/

If you are using ROS Indigo or newer, you can use --prefix command line argument of rosrun (ref)

rosrun --prefix 'gdb -ex run --args' object_recognition_capture upload -i final.bag -n 'example' example --commit

On older ROS versions (or as an alternative solution), you can wrap your node in a launch file, then add launch-prefix="gdb -ex run --args" to any <node> tag, as described in this tutorial.

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Thanks for response. I tried it but gdb still says:

upload: not in executable format: File format not recognized
Starting program:  -i final.bag -n example example --commit
No executable file specified.

And it's true, upload is a python code from the package. So again, how to run it?

sykatch ( 2015-12-15 04:40:21 -0600 )edit

The first line of the file is #!/usr/bin/env python and I already changed permissions chmod 755 upload, but gdb still says it's not an executable.

sykatch ( 2015-12-15 07:22:33 -0600 )edit

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