_dbus_bindings/generic.c

   1 /* General Python glue code, used in _dbus_bindings but not actually anything
   2  * to do with D-Bus.
   3  *
   4  * Copyright (C) 2006 Collabora Ltd. <http://www.collabora.co.uk/>
   5  *
   6  * Permission is hereby granted, free of charge, to any person
   7  * obtaining a copy of this software and associated documentation
   8  * files (the "Software"), to deal in the Software without
   9  * restriction, including without limitation the rights to use, copy,
  10  * modify, merge, publish, distribute, sublicense, and/or sell copies
  11  * of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be
  15  * included in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  20  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  21  * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  22  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  24  * DEALINGS IN THE SOFTWARE.
  25  */
  26
  27 #include "dbus_bindings-internal.h"
  28
  29 /* The empty tuple, held globally since dbus-python turns out to use it quite
  30  * a lot
  31  */
  32 PyObject *dbus_py_empty_tuple = NULL;
  33
  34 PyObject *
  35 dbus_py_tp_richcompare_by_pointer(PyObject *self,
  36                                   PyObject *other,
  37                                   int op)
  38 {
  39     if (op == Py_EQ || op == Py_NE) {
  40         if (self == other) {
  41             return PyInt_FromLong(op == Py_EQ);
  42         }
  43         return PyInt_FromLong(op == Py_NE);
  44     }
  45     PyErr_SetString(PyExc_TypeError,
  46                     "Instances of this type are not ordered");
  47     return NULL;
  48 }
  49
  50 long
  51 dbus_py_tp_hash_by_pointer(PyObject *self)
  52 {
  53     long hash = (long)self;
  54     return (hash == -1L ? -2L : hash);
  55 }
  56
  57 int
  58 dbus_py_immutable_setattro(PyObject *obj UNUSED,
  59                         PyObject *name UNUSED,
  60                         PyObject *value UNUSED)
  61 {
  62     PyErr_SetString(PyExc_AttributeError, "Object is immutable");
  63     return -1;
  64 }
  65
  66 /* Take the global interpreter lock and decrement the reference count.
  67  * Suitable for calling from a C callback. */
  68 void
  69 dbus_py_take_gil_and_xdecref(PyObject *obj)
  70 {
  71     PyGILState_STATE gil = PyGILState_Ensure();
  72     Py_XDECREF(obj);
  73     PyGILState_Release(gil);
  74 }
  75
  76 dbus_bool_t
  77 dbus_py_init_generic(void)
  78 {
  79     dbus_py_empty_tuple = PyTuple_New(0);
  80     if (!dbus_py_empty_tuple) return 0;
  81     return 1;
  82 }
  83
  84 /* vim:set ft=c cino< sw=4 sts=4 et: */