Python C/API Problem

[Gianfranco Murador]

Hi to all python fans,
i'm trying to run this C source file:

#include <Python.h>
#include <structmember.h>
#include <compile.h>
#include <dirent.h>
#include <node.h>


int main(int argc, char *argv[]) {
	Py_Initialize();

	struct _node *node = PyParser_SimpleParseString("from time import
time,ctime\n"
                     					"print 'Today is',ctime(time())\n",0);
	if(node == NULL)
	{
	printf("Errore nel parsing");
	}else{
	PyNode_Compile(node, "./prova.pyc");
	PyNode_Free(node);
	}

	Py_Finalize();
	return 0;
}

I compile the file without errors, but when i launch the executable i
have a Segmentation Fault. I'm using the shared library of python
2.5.2 under linux.. Any ideas? It's clear that i do some mistakes, but
where?
Thanks.
greetings, G.

 

[Philip Semanchuk]

Hi to all python fans,
i'm trying to run this C source file:

#include <Python.h>
#include <structmember.h>
#include <compile.h>
#include <dirent.h>
#include <node.h>


int main(int argc, char *argv[]) {
	Py_Initialize();

	struct _node *node = PyParser_SimpleParseString("from time import
time,ctime\n"
					"print 'Today is',ctime(time())\n",0);
	if(node == NULL)
	{
	printf("Errore nel parsing");
	}else{
	PyNode_Compile(node, "./prova.pyc");
	PyNode_Free(node);
	}

	Py_Finalize();
	return 0;
}

I compile the file without errors, but when i launch the executable i
have a Segmentation Fault. I'm using the shared library of python
2.5.2 under linux.. Any ideas? It's clear that i do some mistakes, but
where?

Hi G,
With some basic debugging you should at least be able to figure out on
which line the segfault happens. Have you done that?


bye
Philip

 

[Gabriel Genellina]

En Fri, 11 Sep 2009 15:10:45 -0300, Gianfranco Murador

int main(int argc, char *argv[]) {
Py_Initialize();

struct _node *node = PyParser_SimpleParseString("from time import
time,ctime\n"
"print 'Today is',ctime(time())\n",0);
if(node == NULL)
{
printf("Errore nel parsing");
}else{
PyNode_Compile(node, "./prova.pyc");
PyNode_Free(node);
}

Py_Finalize();
return 0;
}

I compile the file without errors, but when i launch the executable i
have a Segmentation Fault. I'm using the shared library of python
2.5.2 under linux.. Any ideas? It's clear that i do some mistakes, but

The second argument to PyParser_SimpleParseString must be one of
Py_eval_input, Py_file_input or Py_single_input - not 0.
Anyway, if this is the actual cause of your segfault, seems that a
validation should be added somewhere...

 

[Gianfranco Murador]

Yes, i've done some debugging and the error is on
PyParser_SimpleParseString(..) call. I'll try to change the second
arguments..
Thank to all.

 

[Gianfranco Murador]

Ok, I solved the previous error changing the second argument , but i
have another question. Does PyNode_Compile function store the object
code in the file passed as argument? And it will be execute by python?
I mean, it works if i type 'python prova.pyc'?
Thank.

 

[Gabriel Genellina]

En Sat, 12 Sep 2009 07:37:18 -0300, Gianfranco Murador

Ok, I solved the previous error changing the second argument , but i
have another question. Does PyNode_Compile function store the object
code in the file passed as argument? And it will be execute by python?
I mean, it works if i type 'python prova.pyc'?

No; the filename you pass in is just to set the co_filename attribute of
code objects, and such things.