New submission from nordaux:
I have found out certain peculiarity of interpreter in case it is embedded.
There is no way to reference to the real parameters argv, argc of main process
from embedded python's C extensions.
When python is not embedded, it is task of function Py_Main, which sets the
value of variables orig_argv, orig_argc.
These variables keep references to the original values of argv, argc and give
opportunity to manage them from the python C extensions if necessary.
I understand that the function Py_GetArgcArgv is rarely used, and this is true,
but still believe that ability to manipulate these variables should be exist in
any form of python from its C extension modules.
I tried different modules of C-extensions with such functional in embedded
environment, but they all causes Segmentation Fault. The problem is not only in
their implementation quality without any additional inspections, but also the
function Py_GetArgcArgv doesn't additionally reported that its returned, and
just ruturn null pointer in self argv parameter when used in embedded
environment.
The following quote all the code that refers to this functionality in Python
2.7-3.3 at the moment:
/* For Py_GetArgcArgv(); set by main() */
static char **orig_argv;
static int orig_argc;
..
/* Main program */
int
Py_Main(int argc, char **argv)
{
..
orig_argc = argc; /* For Py_GetArgcArgv() */
orig_argv = argv;
..
}
void
Py_GetArgcArgv(int *argc, char ***argv)
{
*argc = orig_argc;
*argv = orig_argv;
}
Thats why I would like to suggest something similar to such function and use it
in Py_Main and probably make it available from Python C API.
And also extend Py_GetArgcArgv with more detailed null pointer handling if
variables orig_argv, orig_argc had not been initialized.
void
Py_InitArgcArgv(int *argc, char ***argv)
{
if(! *argv) return -1;
orig_argc = *argc; /* For Py_GetArgcArgv() */
orig_argv = *argv;
return 0;
}
Would like to see other suggestions.
Thanks.
--
components: Extension Modules, Interpreter Core
messages: 167639
nosy: nordaux
priority: normal
severity: normal
status: open
title: Real Argc Argv in embeded interpreter
type: crash
versions: Python 2.7, Python 3.2, Python 3.3
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