New submission from Venkateswaran <wenka...@gmail.com>:
The attached code is failing to convert None to Null. It is successful
if the int* is shifted towards the beginning of argument list. The bug
is actually in 32/64 bit pointers as the code works on a 32 bit system.
The bug disappears if I reduce the number of arguments to less than 10.
I created the so using the command - "gcc -shared -fPIC -o libtest.so
libtest.c", (gcc (Debian 4.3.2-1.1) 4.3.2)
The c file is as follows:
libtest.c
#include <stdint.h>
#include <stdio.h>
int32_t where ( int32_t a, int32_t c, int32_t d, int32_t e, int32_t f,
int32_t g, int32_t h, int32_t *b, int32_t i, int32_t j, int32_t k,
int32_t l)
{
printf("b = %p\n", (void *)b);
printf("a = %d, c = %d, d = %d, e = %d, f = %d, g = %d, h = %d, i =
%d, j = %d, k = %d, l = %d", a,c,d,e,f,g,h,i,j,k,l);
return 100;
} /* where() */
Python Code:
import ctypes
libtest = ctypes.CDLL('./libtest.so')
where = libtest.where
where.restype = ctypes.c_int
where.argtypes = [
ctypes.c_int32, ctypes.c_int32, ctypes.c_int32,
ctypes.c_int32, ctypes.c_int32, ctypes.c_int32, ctypes.c_int32,
ctypes.POINTER(ctypes.c_int32),
ctypes.c_int32, ctypes.c_int32, ctypes.c_int32,
ctypes.c_int32,
]
a = 7
b = None
status = where(a,a,a,a,a,a,a,b,a,a,a,a)
----------
assignee: theller
components: ctypes
files: test.py
messages: 96385
nosy: theller, wenkat_s
severity: normal
status: open
title: ctypes not converting None to Null in 64-bit system
type: crash
versions: Python 2.5, Python 2.6
Added file: http://bugs.python.org/file15557/test.py
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue7505>
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