[Python-Dev] Re: PEP 324 (process module) (original) (raw)
Peter Astrand astrand at lysator.liu.se
Tue Aug 3 20:09:29 CEST 2004
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Last time I tried it there were still a few windows issues (docs say these have been resolved), but I thought the API was well-designed.
The details: The module works great on Windows currently, but requires the win32all extensions. The idea is to get rid of this dependency by writing a glue module, pretty much as _winreg.
Work on such a _process module has been done on two fronts:
A friendly Python-developer has gotten quite far, but was experiencing some strange hangs. I haven't been able to look at this work yet.
I've started working on an implementation myself. I was using _winreg as some sort of template. The problem is: I've never written extension modules before :-) It was quite easy to export the numeric constants, but when I came to creating Python objects, I was lost. I'll guess I need to read some documentation.
This is what remains:
win32api: GetStdHandle GetCurrentProcess, DuplicateHandle
win32pipe: CreatePipe
win32process: CreateProcess, STARTUPINFO, GetExitCodeProcess
win32event: WaitForSingleObject
Here's the module so far:
/* _process.c */
#include "windows.h" #include "Python.h" #include "structmember.h" #include "malloc.h" /* for alloca */
/* The win32api module reports the function name that failed,
but this concept is not in the Python core.
Hopefully it will one day, and in the meantime I dont
want to lose this info...
*/
#define PyErr_SetFromWindowsErrWithFunction(rc, fnname)
PyErr_SetFromWindowsErr(rc)
/* Forward declares */
/* Doc strings */ // FIXME PyDoc_STRVAR(module_doc, "This module provides...\n");
static struct PyMethodDef process_methods[] = { NULL, };
static void insint(PyObject * d, char * name, long value) { PyObject *v = PyInt_FromLong(value); if (!v || PyDict_SetItemString(d, name, v)) PyErr_Clear(); Py_XDECREF(v); }
#define ADD_INT(val) insint(d, #val, val)
PyMODINIT_FUNC init_process(void) { PyObject *m, *d; m = Py_InitModule3("_process", process_methods, module_doc); d = PyModule_GetDict(m); Py_INCREF(PyExc_WindowsError); if (PyDict_SetItemString(d, "error", PyExc_WindowsError) != 0) return;
/* Add the relevant constants */
ADD_INT(DUPLICATE_SAME_ACCESS);
ADD_INT(STARTF_USESTDHANDLES);
ADD_INT(STD_INPUT_HANDLE);
ADD_INT(STD_OUTPUT_HANDLE);
ADD_INT(STD_ERROR_HANDLE);
ADD_INT(INFINITE);
ADD_INT(WAIT_OBJECT_0);}
(I will be away for a couple of days.)
/Peter Åstrand <astrand at lysator.liu.se>
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