lib/talloc/pytalloc.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Python Talloc Module
   4    Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2010-2011
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include <Python.h>
  21 #include <talloc.h>
  22 #include <pytalloc.h>
  23
  24 void inittalloc(void);
  25
  26 /* print a talloc tree report for a talloc python object */
  27 static PyObject *pytalloc_report_full(PyObject *self, PyObject *args)
  28 {
  29         PyObject *py_obj = Py_None;
  30
  31         if (!PyArg_ParseTuple(args, "|O", &py_obj))
  32                 return NULL;
  33
  34         if (py_obj == Py_None) {
  35                 talloc_report_full(NULL, stdout);
  36         } else {
  37                 talloc_report_full(pytalloc_get_mem_ctx(py_obj), stdout);
  38         }
  39         return Py_None;
  40 }
  41
  42 /* enable null tracking */
  43 static PyObject *pytalloc_enable_null_tracking(PyObject *self)
  44 {
  45         talloc_enable_null_tracking();
  46         return Py_None;
  47 }
  48
  49 /* return the number of talloc blocks */
  50 static PyObject *pytalloc_total_blocks(PyObject *self, PyObject *args)
  51 {
  52         PyObject *py_obj = Py_None;
  53
  54         if (!PyArg_ParseTuple(args, "|O", &py_obj))
  55                 return NULL;
  56
  57         if (py_obj == Py_None) {
  58                 return PyLong_FromLong(talloc_total_blocks(NULL));
  59         }
  60
  61         return PyLong_FromLong(talloc_total_blocks(pytalloc_get_mem_ctx(py_obj)));
  62 }
  63
  64 static PyMethodDef talloc_methods[] = {
  65         { "report_full", (PyCFunction)pytalloc_report_full, METH_VARARGS,
  66                 "show a talloc tree for an object"},
  67         { "enable_null_tracking", (PyCFunction)pytalloc_enable_null_tracking, METH_NOARGS,
  68                 "enable tracking of the NULL object"},
  69         { "total_blocks", (PyCFunction)pytalloc_total_blocks, METH_VARARGS,
  70                 "return talloc block count"},
  71         { NULL }
  72 };
  73
  74 /**
  75  * Default (but only slightly more useful than the default) implementation of Repr().
  76  */
  77 static PyObject *pytalloc_default_repr(PyObject *obj)
  78 {
  79         pytalloc_Object *talloc_obj = (pytalloc_Object *)obj;
  80         PyTypeObject *type = (PyTypeObject*)PyObject_Type(obj);
  81
  82         return PyString_FromFormat("<%s talloc object at 0x%p>",
  83                                    type->tp_name, talloc_obj->ptr);
  84 }
  85
  86 /**
  87  * Simple dealloc for talloc-wrapping PyObjects
  88  */
  89 static void pytalloc_dealloc(PyObject* self)
  90 {
  91         pytalloc_Object *obj = (pytalloc_Object *)self;
  92         assert(talloc_unlink(NULL, obj->talloc_ctx) != -1);
  93         obj->talloc_ctx = NULL;
  94         self->ob_type->tp_free(self);
  95 }
  96
  97 /**
  98  * Default (but only slightly more useful than the default) implementation of cmp.
  99  */
 100 static int pytalloc_default_cmp(PyObject *_obj1, PyObject *_obj2)
 101 {
 102         pytalloc_Object *obj1 = (pytalloc_Object *)_obj1,
 103                                          *obj2 = (pytalloc_Object *)_obj2;
 104         if (obj1->ob_type != obj2->ob_type)
 105                 return (obj1->ob_type - obj2->ob_type);
 106
 107         return ((char *)pytalloc_get_ptr(obj1) - (char *)pytalloc_get_ptr(obj2));
 108 }
 109
 110 static PyTypeObject TallocObject_Type = {
 111         .tp_name = "talloc.Object",
 112         .tp_doc = "Python wrapper for a talloc-maintained object.",
 113         .tp_basicsize = sizeof(pytalloc_Object),
 114         .tp_dealloc = (destructor)pytalloc_dealloc,
 115         .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
 116         .tp_repr = pytalloc_default_repr,
 117         .tp_compare = pytalloc_default_cmp,
 118 };
 119
 120 void inittalloc(void)
 121 {
 122         PyObject *m;
 123
 124         if (PyType_Ready(&TallocObject_Type) < 0)
 125                 return;
 126
 127         m = Py_InitModule3("talloc", talloc_methods,
 128                                            "Python wrapping of talloc-maintained objects.");
 129         if (m == NULL)
 130                 return;
 131
 132         Py_INCREF(&TallocObject_Type);
 133         PyModule_AddObject(m, "Object", (PyObject *)&TallocObject_Type);
 134 }