Getting Valgrind to detect memory leaks from C++ program called by Python Script:

Question

If a C++ program is called by a python script, how do you get Valgrind to check leaks in the C++ program and not just in the script? For example, if leak.cc contains the following code

int main() {
    int* p = new int;
}

and is compiled into a.out, and call_aout.py contains

#!/usr/bin/env python
import subprocess
subprocess.call(["./a.out"])

then running valgrind via

valgrind --track-origins=yes --leak-check=full -v ./call_aout.py

will not detect the memory leak in leak.cc, but calling it via

valgrind --track-origins=yes --leak-check=full -v ./a.out

will detect it.

@KerrekSB: valgrind always follows forks, but he needs it to follow an exec — Nick Bastin
– Nick Bastin, Commented May 26, 2014 at 20:28

Nick Bastin · Accepted Answer · 2014-05-26 20:26:04Z

4

You want to use:

  --trace-children=yes

in your valgrind command line. Alternatively if you don't care about the python script all you can launch your subprocess with valgrind from within the script:

subprocess.call("valgrind --track-origins=yes --leak-check=full -v ./a.out")

answered May 26, 2014 at 20:26

Nick Bastin

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