gistfile1.c

// Prerequisite: python2.7-dev
// Compile with: gcc -shared -fPIC -o liboverride.so override_pydict.c -ldl
// Run as: LD_PRELOAD=./liboverride.so python

#define _GNU_SOURCE 1
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <dlfcn.h>
#include "python2.7/Python.h"

PyObject* PyDict_New(void)
{
	PyObject* (*orig_PyDict_New)(void) = dlsym(RTLD_NEXT, "PyDict_New");
	printf("Calling PyDict_New\n");

	return orig_PyDict_New();
}