Calling Cython function from C code raises segmentation fault

by

I guess you are using Cython 0.29. Since 0.29, PEP-489 multi-phase module initialisation has been enabled for Python versions >=3.5. This means, using PyInit_XXX is no longer sufficient, as you are experiencing.

Cython’s documentation suggest to use inittab mechanism, i.e. your main-function should look something like:

#include "Python.h"
#include "transcendentals.h"
#include <math.h>
#include <stdio.h>

int main(int argc, char **argv) {
  int status=PyImport_AppendInittab("transcendentals", PyInit_transcendentals);
  if(status==-1){
    return -1;//error
  } 
  Py_Initialize();
  PyObject *module = PyImport_ImportModule("transcendentals");

  if(module==NULL){
     Py_Finalize();
     return -1;//error
  }
  
  printf("pi**e: %f\n", pow(PI, get_e()));
  Py_Finalize();
  return 0;
}

Another possibility to restore the old behavior would be to define macro CYTHON_PEP489_MULTI_PHASE_INIT=0 and thus overriding the default by e.g. passing -DCYTHON_PEP489_MULTI_PHASE_INIT=0 to gcc on the command line while compiling.

More Related Contents:

  1. Use generated header file from Cython
  2. C expected expression before struct error
  3. Not able to calculate in C.How do you calculate in C?
  4. Where did i make a mistake in my program i think its a logical error but i cant quite find it [closed]
  5. Check if input is integer type in C
  6. Difference between char *str=”STRING” and char str[] = “STRING”?
  7. Why does writing to a string literal in this C program segfault?
  8. Is C strongly typed?
  9. Any guaranteed minimum sizes for types in C?
  10. POSIX API call to list all the pthreads running in a process
  11. Loop with function call faster than an empty loop
  12. What is the fastest way to find if a number is even or odd?
  13. Negative clock cycle measurements with back-to-back rdtsc?
  14. Should I free char* initialized using string-literals?
  15. How do I print a non-null-terminated string using printf?
  16. C: correct usage of strtok_r
  17. What is the fastest way to convert float to int on x86
  18. Regarding ‘main(int argc, char *argv[])’ [duplicate]
  19. How can I check if a value has even parity of bits or odd?
  20. Passing two-dimensional array via pointer
  21. Should you always use ‘int’ for numbers in C, even if they are non-negative?
  22. strcmp() return values in C [duplicate]
  23. Linking with gcc and -lm doesn’t define ceil() on Ubuntu
  24. What is “…” in switch-case in C code
  25. How are static variables with the same name in different functions identified by the System?
  26. Print text instead of value from C enum
  27. Declaring and initializing arrays in C
  28. Executing a shared library on Unix
  29. What is the meaning of a dot (.) after an integer in c?
  30. conflicting types error when compiling c program using gcc

Leave a Comment