I am calling python code inside a C function and it works fine. However, I wanted to call the C function from python (effectively reuse all the C code) but when it comes to importing the python modules from C I get a seg. fault

(Removed all error checking from the code to make this simpler)

main.c:

#include "Python.h"



int runpython() {

    Py_Initialize();

    PyObject* pFunc;

    PyObject *pArgs;

    PyObject *pValue;

    PyObject* pName = PyString_FromString("python_module");

    PyObject* pModule = PyImport_Import(pName);

    Py_DECREF(pModule);



    pFunc = PyObject_GetAttrString(pModule, "pcall");

    pArgs = PyTuple_New(1);

    pValue = PyInt_FromLong(42);

    PyTuple_SetItem(pArgs, 0, pValue);

    pValue = PyObject_CallObject(pFunc, pArgs);

    Py_DECREF(pArgs);

    Py_DECREF(pValue);

    Py_XDECREF(pFunc);

    Py_DECREF(pModule);

}



int main() {

    return runpython();

}

python_module.py

def pcall(value):

    print "Value: " + str(value)

python_main.py

from ctypes import *



cdll.LoadLibrary("libMyPython.so")

libc = CDLL("libMyPython.so") 

libc.runpython()

environment and execution:

export PYTHONPATH=$PYTHONPATH:$PWD

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$PWD



echo "Running C main"

gcc main.c -o main -I/usr/include/python2.7 -lpython2.7 -g

./main



echo "Running Python main"

gcc -shared -fPIC main.c -o libMyPython.so -I/usr/include/python2.7 -lpython2.7 -g

python python_main.py

A sample output is:

### Running C main

Value: 42

### Running Python main

Segmentation fault      (core dumped)

Running in gdb yields the stack:

Program received signal SIGSEGV, Segmentation fault.

0x00005555556318d9 in PyImport_Import ()

(gdb) bt

#0  0x00005555556318d9 in PyImport_Import ()

#1  0x00007ffff5e07883 in runpython () at c_main.c:9

#2  0x00007ffff600edae in ffi_call_unix64 () from /usr/lib/x86_64-linux-gnu/libffi.so.6

#3  0x00007ffff600e71f in ffi_call () from /usr/lib/x86_64-linux-gnu/libffi.so.6

#4  0x00007ffff6221e56 in _ctypes_callproc ()

   from /usr/lib/python2.7/lib-dynload/_ctypes.x86_64-linux-gnu.so

#5  0x00007ffff6221505 in ?? () from /usr/lib/python2.7/lib-dynload/_ctypes.x86_64-linux-gnu.so

#6  0x000055555564f420 in PyEval_EvalFrameEx ()

#7  0x0000555555647d0a in PyEval_EvalCodeEx ()

#8  0x0000555555647629 in PyEval_EvalCode ()

#9  0x000055555567861f in ?? ()

#10 0x0000555555673322 in PyRun_FileExFlags ()

#11 0x000055555567267d in PyRun_SimpleFileExFlags ()

#12 0x00005555556211ab in Py_Main ()

#13 0x00007ffff7a05b97 in __libc_start_main (main=0x555555620b10 <main>, argc=2, 

    argv=0x7fffffffde58, init=<optimised out>, fini=<optimised out>, rtld_fini=<optimised out>, 

    stack_end=0x7fffffffde48) at ../csu/libc-start.c:310

#14 0x0000555555620a2a in _start ()

I have tried using PyImport_ImportModule or PyRun_SimpleString("import python_module") with the same effects... Any ideas?

I am running this on an ubuntu machine using python2.7.