seg. fault with ext. module

[Steffen Ries]

"Gorny" <gorny at hobbiton.org> writes:

> Hi,
> 
> -----code------
> #include <Python.h>
> 
> static PyObject * makesock(PyObject *self, PyObject *args);
> 
> static PyMethodDef gforce_methods[] = {
>  {"makesock", makesock, METH_VARARGS},
>  {NULL, NULL}
> };
> 
> static PyObject * makesock(PyObject *self, PyObject *args)
> {
>  printf("Making socket...\n");

   Py_INCREF(Py_None);

>  return Py_None;
> }
> 
> /* Initialization function for the module */
> DL_EXPORT(void) initgforce(void)
> {
>  (void)Py_InitModule("gforce", gforce_methods);
> }
> -----eof-----
> 
> >>> import gforce
> >>> gforce.makesock()
> Making socket...
> >>> Ctrl-D
> Segmentation fault
> [gorny at darkstar ~/gforce]$
> 
> How do I prevent this. If i import other modules and close the python-shell
> it'll not end with a segmentation fault, only if it's my module.. Do i have
> to make an extra function in it, which `de-inits` the module..??

You forgot to increment the reference count for None, which creates a
problem at termination time.

See http://www.python.org/doc/current/ext/refcounts.html

hth,
/steffen