Python/Talloc glue
Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2008
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
+ ** NOTE! The following LGPL license applies to the talloc
+ ** library. This does NOT imply that all of Samba is released
+ ** under the LGPL
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 3 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include <Python.h>
#include <assert.h>
#include "pytalloc_private.h"
+static PyObject *pytalloc_steal_or_reference(PyTypeObject *py_type,
+ TALLOC_CTX *mem_ctx, void *ptr, bool steal);
+
_PUBLIC_ PyTypeObject *pytalloc_GetObjectType(void)
{
static PyTypeObject *type = NULL;
PyObject *mod;
- if (type != NULL) {
- return type;
- }
-
mod = PyImport_ImportModule("talloc");
if (mod == NULL) {
return NULL;
static PyTypeObject *type = NULL;
PyObject *mod;
- if (type != NULL) {
- return type;
- }
-
mod = PyImport_ImportModule("talloc");
if (mod == NULL) {
return NULL;
static PyTypeObject *type = NULL;
PyObject *mod;
- if (type != NULL) {
- return type;
- }
-
mod = PyImport_ImportModule("talloc");
if (mod == NULL) {
return NULL;
_PUBLIC_ PyObject *pytalloc_steal_ex(PyTypeObject *py_type, TALLOC_CTX *mem_ctx,
void *ptr)
{
- PyTypeObject *BaseObjectType = pytalloc_GetBaseObjectType();
- PyTypeObject *ObjectType = pytalloc_GetObjectType();
-
- if (mem_ctx == NULL) {
- return PyErr_NoMemory();
- }
-
- if (PyType_IsSubtype(py_type, BaseObjectType)) {
- pytalloc_BaseObject *ret
- = (pytalloc_BaseObject *)py_type->tp_alloc(py_type, 0);
-
- ret->talloc_ctx = talloc_new(NULL);
- if (ret->talloc_ctx == NULL) {
- return NULL;
- }
-
- /*
- * This allows us to keep multiple references to this object -
- * we only reference this context, which is per ptr, not the
- * talloc_ctx, which is per pytalloc_Object
- */
- if (talloc_steal(ret->talloc_ctx, mem_ctx) == NULL) {
- return NULL;
- }
- ret->talloc_ptr_ctx = mem_ctx;
- talloc_set_name_const(ret->talloc_ctx, py_type->tp_name);
- ret->ptr = ptr;
- return (PyObject *)ret;
-
- } else if (PyType_IsSubtype(py_type, ObjectType)) {
- pytalloc_Object *ret
- = (pytalloc_Object *)py_type->tp_alloc(py_type, 0);
-
- ret->talloc_ctx = talloc_new(NULL);
- if (ret->talloc_ctx == NULL) {
- return NULL;
- }
-
- if (talloc_steal(ret->talloc_ctx, mem_ctx) == NULL) {
- return NULL;
- }
- talloc_set_name_const(ret->talloc_ctx, py_type->tp_name);
- ret->ptr = ptr;
- return (PyObject *)ret;
- } else {
- PyErr_SetString(PyExc_RuntimeError,
- "pytalloc_steal_ex() called for object type "
- "not based on talloc");
- return NULL;
- }
+ return pytalloc_steal_or_reference(py_type, mem_ctx, ptr, true);
}
/**
*/
_PUBLIC_ PyObject *pytalloc_steal(PyTypeObject *py_type, void *ptr)
{
- return pytalloc_steal_ex(py_type, ptr, ptr);
+ return pytalloc_steal_or_reference(py_type, ptr, ptr, true);
}
_PUBLIC_ PyObject *pytalloc_reference_ex(PyTypeObject *py_type,
TALLOC_CTX *mem_ctx, void *ptr)
{
- PyTypeObject *BaseObjectType = pytalloc_GetBaseObjectType();
- PyTypeObject *ObjectType = pytalloc_GetObjectType();
+ return pytalloc_steal_or_reference(py_type, mem_ctx, ptr, false);
+}
+
+
+/**
+ * Internal function that either steals or referecences the talloc
+ * pointer into a new talloc context.
+ */
+static PyObject *pytalloc_steal_or_reference(PyTypeObject *py_type,
+ TALLOC_CTX *mem_ctx, void *ptr, bool steal)
+{
+ bool ok = false;
+ TALLOC_CTX *talloc_ctx = NULL;
+ bool is_baseobject = false;
+ PyObject *obj = NULL;
+ PyTypeObject *BaseObjectType = NULL, *ObjectType = NULL;
+
+ BaseObjectType = pytalloc_GetBaseObjectType();
+ if (BaseObjectType == NULL) {
+ goto err;
+ }
+ ObjectType = pytalloc_GetObjectType();
+ if (ObjectType == NULL) {
+ goto err;
+ }
+ /* this should have been tested by caller */
if (mem_ctx == NULL) {
return PyErr_NoMemory();
}
- if (PyType_IsSubtype(py_type, BaseObjectType)) {
- pytalloc_BaseObject *ret
- = (pytalloc_BaseObject *)py_type->tp_alloc(py_type, 0);
- ret->talloc_ctx = talloc_new(NULL);
- if (ret->talloc_ctx == NULL) {
- return NULL;
- }
- if (talloc_reference(ret->talloc_ctx, mem_ctx) == NULL) {
- return NULL;
- }
- talloc_set_name_const(ret->talloc_ctx, py_type->tp_name);
- ret->talloc_ptr_ctx = mem_ctx;
- ret->ptr = ptr;
- return (PyObject *)ret;
- } else if (PyType_IsSubtype(py_type, ObjectType)) {
- pytalloc_Object *ret
- = (pytalloc_Object *)py_type->tp_alloc(py_type, 0);
- ret->talloc_ctx = talloc_new(NULL);
- if (ret->talloc_ctx == NULL) {
- return NULL;
- }
- if (talloc_reference(ret->talloc_ctx, mem_ctx) == NULL) {
+ is_baseobject = PyType_IsSubtype(py_type, BaseObjectType);
+ if (!is_baseobject) {
+ if (!PyType_IsSubtype(py_type, ObjectType)) {
+ PyErr_SetString(PyExc_TypeError,
+ "Expected type based on talloc");
return NULL;
}
- talloc_set_name_const(ret->talloc_ctx, py_type->tp_name);
- ret->ptr = ptr;
- return (PyObject *)ret;
- } else {
- PyErr_SetString(PyExc_RuntimeError,
- "pytalloc_reference_ex() called for object type "
- "not based on talloc");
- return NULL;
}
-}
-#if PY_MAJOR_VERSION < 3
+ obj = py_type->tp_alloc(py_type, 0);
+ if (obj == NULL) {
+ goto err;
+ }
-static void py_cobject_talloc_free(void *ptr)
-{
- talloc_free(ptr);
-}
+ talloc_ctx = talloc_new(NULL);
+ if (talloc_ctx == NULL) {
+ PyErr_NoMemory();
+ goto err;
+ }
-_PUBLIC_ PyObject *pytalloc_CObject_FromTallocPtr(void *ptr)
-{
- if (ptr == NULL) {
- Py_RETURN_NONE;
+ if (steal) {
+ ok = (talloc_steal(talloc_ctx, mem_ctx) != NULL);
+ } else {
+ ok = (talloc_reference(talloc_ctx, mem_ctx) != NULL);
}
- return PyCObject_FromVoidPtr(ptr, py_cobject_talloc_free);
-}
+ if (!ok) {
+ goto err;
+ }
+ talloc_set_name_const(talloc_ctx, py_type->tp_name);
-#endif
+ if (is_baseobject) {
+ pytalloc_BaseObject *ret = (pytalloc_BaseObject*)obj;
+ ret->talloc_ctx = talloc_ctx;
+ ret->talloc_ptr_ctx = mem_ctx;
+ ret->ptr = ptr;
+ } else {
+ pytalloc_Object *ret = (pytalloc_Object*)obj;
+ ret->talloc_ctx = talloc_ctx;
+ ret->ptr = ptr;
+ }
+ return obj;
+
+err:
+ TALLOC_FREE(talloc_ctx);
+ Py_XDECREF(obj);
+ return NULL;
+}
/*
* Wrap a generic talloc pointer into a talloc.GenericObject,
{
TALLOC_CTX *mem_ctx;
void *ptr = NULL;
- void *type_obj = talloc_check_name(ptr, type_name);
+ void *type_obj;
mem_ctx = _pytalloc_get_mem_ctx(py_obj);
ptr = _pytalloc_get_ptr(py_obj);
- if (mem_ctx != ptr) {
+ if (mem_ctx != ptr || ptr == NULL) {
if (check_only) {
return NULL;
}
{
PyTypeObject *talloc_type = pytalloc_GetBaseObjectType();
if (talloc_type == NULL) {
- PyErr_Format(PyExc_TypeError, "pytalloc: unable to get talloc.BaseObject type");
return -1;
}
return PyType_Ready(type);
}
+
+_PUBLIC_ const char *_pytalloc_get_name(PyObject *obj)
+{
+ void *ptr = pytalloc_get_ptr(obj);
+ if (ptr == NULL) {
+ return "non-talloc object";
+ }
+ return talloc_get_name(ptr);
+}
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