lib/tevent/pytevent.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Python bindings for tevent
   4
   5    Copyright (C) Jelmer Vernooij 2010
   6
   7      ** NOTE! The following LGPL license applies to the tevent
   8      ** library. This does NOT imply that all of Samba is released
   9      ** under the LGPL
  10
  11    This library is free software; you can redistribute it and/or
  12    modify it under the terms of the GNU Lesser General Public
  13    License as published by the Free Software Foundation; either
  14    version 3 of the License, or (at your option) any later version.
  15
  16    This library is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19    Lesser General Public License for more details.
  20
  21    You should have received a copy of the GNU Lesser General Public
  22    License along with this library; if not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include <Python.h>
  26 #include <tevent.h>
  27
  28 void init_tevent(void);
  29
  30 typedef struct {
  31         PyObject_HEAD
  32         struct tevent_context *ev;
  33 } TeventContext_Object;
  34
  35 typedef struct {
  36         PyObject_HEAD
  37         struct tevent_queue *queue;
  38 } TeventQueue_Object;
  39
  40 typedef struct {
  41         PyObject_HEAD
  42         struct tevent_req *req;
  43 } TeventReq_Object;
  44
  45 typedef struct {
  46         PyObject_HEAD
  47         struct tevent_signal *signal;
  48 } TeventSignal_Object;
  49
  50 typedef struct {
  51         PyObject_HEAD
  52         struct tevent_timer *timer;
  53 } TeventTimer_Object;
  54
  55 typedef struct {
  56         PyObject_HEAD
  57         struct tevent_fd *fd;
  58 } TeventFd_Object;
  59
  60 staticforward PyTypeObject TeventContext_Type;
  61 staticforward PyTypeObject TeventReq_Type;
  62 staticforward PyTypeObject TeventQueue_Type;
  63 staticforward PyTypeObject TeventSignal_Type;
  64 staticforward PyTypeObject TeventTimer_Type;
  65 staticforward PyTypeObject TeventFd_Type;
  66
  67 static int py_context_init(struct tevent_context *ev)
  68 {
  69         /* FIXME */
  70         return 0;
  71 }
  72
  73 static struct tevent_fd *py_add_fd(struct tevent_context *ev,
  74                                     TALLOC_CTX *mem_ctx,
  75                                     int fd, uint16_t flags,
  76                                     tevent_fd_handler_t handler,
  77                                     void *private_data,
  78                                     const char *handler_name,
  79                                     const char *location)
  80 {
  81         /* FIXME */
  82         return NULL;
  83 }
  84
  85 static void py_set_fd_close_fn(struct tevent_fd *fde,
  86                                 tevent_fd_close_fn_t close_fn)
  87 {
  88         /* FIXME */
  89 }
  90
  91 static uint16_t py_get_fd_flags(struct tevent_fd *fde)
  92 {
  93         /* FIXME */
  94         return 0;
  95 }
  96
  97 static void py_set_fd_flags(struct tevent_fd *fde, uint16_t flags)
  98 {
  99         /* FIXME */
 100 }
 101
 102 /* timed_event functions */
 103 static struct tevent_timer *py_add_timer(struct tevent_context *ev,
 104                                           TALLOC_CTX *mem_ctx,
 105                                           struct timeval next_event,
 106                                           tevent_timer_handler_t handler,
 107                                           void *private_data,
 108                                           const char *handler_name,
 109                                           const char *location)
 110 {
 111         /* FIXME */
 112         return NULL;
 113 }
 114
 115 /* immediate event functions */
 116 static void py_schedule_immediate(struct tevent_immediate *im,
 117                                    struct tevent_context *ev,
 118                                    tevent_immediate_handler_t handler,
 119                                    void *private_data,
 120                                    const char *handler_name,
 121                                    const char *location)
 122 {
 123         /* FIXME */
 124 }
 125
 126 /* signal functions */
 127 static struct tevent_signal *py_add_signal(struct tevent_context *ev,
 128                                             TALLOC_CTX *mem_ctx,
 129                                             int signum, int sa_flags,
 130                                             tevent_signal_handler_t handler,
 131                                             void *private_data,
 132                                             const char *handler_name,
 133                                             const char *location)
 134 {
 135         /* FIXME */
 136         return NULL;
 137 }
 138
 139 /* loop functions */
 140 static int py_loop_once(struct tevent_context *ev, const char *location)
 141 {
 142         /* FIXME */
 143         return 0;
 144 }
 145
 146 static int py_loop_wait(struct tevent_context *ev, const char *location)
 147 {
 148         /* FIXME */
 149         return 0;
 150 }
 151
 152 const static struct tevent_ops py_tevent_ops = {
 153         .context_init = py_context_init,
 154         .add_fd = py_add_fd,
 155         .set_fd_close_fn = py_set_fd_close_fn,
 156         .get_fd_flags = py_get_fd_flags,
 157         .set_fd_flags = py_set_fd_flags,
 158         .add_timer = py_add_timer,
 159         .schedule_immediate = py_schedule_immediate,
 160         .add_signal = py_add_signal,
 161         .loop_wait = py_loop_wait,
 162         .loop_once = py_loop_once,
 163 };
 164
 165 static PyObject *py_register_backend(PyObject *self, PyObject *args)
 166 {
 167         PyObject *name, *py_backend;
 168
 169         if (!PyArg_ParseTuple(args, "O", &py_backend))
 170                 return NULL;
 171
 172         name = PyObject_GetAttrString(py_backend, "name");
 173         if (name == NULL) {
 174                 PyErr_SetNone(PyExc_AttributeError);
 175                 return NULL;
 176         }
 177
 178         if (!PyString_Check(name)) {
 179                 PyErr_SetNone(PyExc_TypeError);
 180                 return NULL;
 181         }
 182
 183         if (!tevent_register_backend(PyString_AsString(name), &py_tevent_ops)) { /* FIXME: What to do with backend */
 184                 PyErr_SetNone(PyExc_RuntimeError);
 185                 return NULL;
 186         }
 187
 188         Py_RETURN_NONE;
 189 }
 190
 191 static PyObject *py_tevent_context_reinitialise(TeventContext_Object *self)
 192 {
 193         int ret = tevent_re_initialise(self->ev);
 194         if (ret != 0) {
 195                 PyErr_SetNone(PyExc_RuntimeError);
 196                 return NULL;
 197         }
 198         Py_RETURN_NONE;
 199 }
 200
 201 static PyObject *py_tevent_queue_stop(TeventQueue_Object *self)
 202 {
 203         tevent_queue_stop(self->queue);
 204         Py_RETURN_NONE;
 205 }
 206
 207 static PyObject *py_tevent_queue_start(TeventQueue_Object *self)
 208 {
 209         tevent_queue_start(self->queue);
 210         Py_RETURN_NONE;
 211 }
 212
 213 static void py_queue_trigger(struct tevent_req *req, void *private_data)
 214 {
 215         PyObject *callback = private_data, *ret;
 216
 217         ret = PyObject_CallFunction(callback, "");
 218         Py_XDECREF(ret);
 219 }
 220
 221 static PyObject *py_tevent_queue_add(TeventQueue_Object *self, PyObject *args)
 222 {
 223         TeventContext_Object *py_ev;
 224         TeventReq_Object *py_req;
 225         PyObject *trigger;
 226         bool ret;
 227
 228         if (!PyArg_ParseTuple(args, "O!O!O",
 229                                                   &TeventContext_Type, &py_ev,
 230                                                   &TeventReq_Type, &py_req,
 231                                                   &trigger))
 232                 return NULL;
 233
 234         Py_INCREF(trigger);
 235
 236         ret = tevent_queue_add(self->queue, py_ev->ev, py_req->req,
 237                                                    py_queue_trigger, trigger);
 238         if (!ret) {
 239                 PyErr_SetString(PyExc_RuntimeError, "queue add failed");
 240                 Py_DECREF(trigger);
 241                 return NULL;
 242         }
 243
 244         Py_RETURN_NONE;
 245 }
 246
 247 static PyMethodDef py_tevent_queue_methods[] = {
 248         { "stop", (PyCFunction)py_tevent_queue_stop, METH_NOARGS,
 249                 "S.stop()" },
 250         { "start", (PyCFunction)py_tevent_queue_start, METH_NOARGS,
 251                 "S.start()" },
 252         { "add", (PyCFunction)py_tevent_queue_add, METH_VARARGS,
 253                 "S.add(ctx, req, trigger, baton)" },
 254         { NULL },
 255 };
 256
 257 static PyObject *py_tevent_context_wakeup_send(PyObject *self, PyObject *args)
 258 {
 259         /* FIXME */
 260
 261         Py_RETURN_NONE;
 262 }
 263
 264 static PyObject *py_tevent_context_loop_wait(TeventContext_Object *self)
 265 {
 266         if (tevent_loop_wait(self->ev) != 0) {
 267                 PyErr_SetNone(PyExc_RuntimeError);
 268                 return NULL;
 269         }
 270         Py_RETURN_NONE;
 271 }
 272
 273 static PyObject *py_tevent_context_loop_once(TeventContext_Object *self)
 274 {
 275         if (tevent_loop_once(self->ev) != 0) {
 276                 PyErr_SetNone(PyExc_RuntimeError);
 277                 return NULL;
 278         }
 279         Py_RETURN_NONE;
 280 }
 281
 282 #ifdef TEVENT_DEPRECATED
 283 static bool py_tevent_finished(PyObject *callback)
 284 {
 285         PyObject *py_ret;
 286         bool ret;
 287
 288         py_ret = PyObject_CallFunction(callback, "");
 289         if (py_ret == NULL)
 290                 return true;
 291         ret = PyObject_IsTrue(py_ret);
 292         Py_DECREF(py_ret);
 293         return ret;
 294 }
 295
 296 static PyObject *py_tevent_context_loop_until(TeventContext_Object *self, PyObject *args)
 297 {
 298         PyObject *callback;
 299         if (!PyArg_ParseTuple(args, "O", &callback))
 300                 return NULL;
 301
 302         if (tevent_loop_until(self->ev, py_tevent_finished, callback) != 0) {
 303                 PyErr_SetNone(PyExc_RuntimeError);
 304                 return NULL;
 305         }
 306
 307         if (PyErr_Occurred())
 308                 return NULL;
 309
 310         Py_RETURN_NONE;
 311 }
 312 #endif
 313
 314 static void py_tevent_signal_handler(struct tevent_context *ev,
 315                                         struct tevent_signal *se,
 316                                         int signum,
 317                                         int count,
 318                                         void *siginfo,
 319                                         void *private_data)
 320 {
 321         PyObject *callback = (PyObject *)private_data, *ret;
 322
 323         ret = PyObject_CallFunction(callback, "ii", signum, count);
 324         Py_XDECREF(ret);
 325 }
 326
 327 static void py_tevent_signal_dealloc(TeventSignal_Object *self)
 328 {
 329         talloc_free(self->signal);
 330         PyObject_Del(self);
 331 }
 332
 333 static PyTypeObject TeventSignal_Type = {
 334         .tp_name = "tevent.Signal",
 335         .tp_basicsize = sizeof(TeventSignal_Object),
 336         .tp_dealloc = (destructor)py_tevent_signal_dealloc,
 337         .tp_flags = Py_TPFLAGS_DEFAULT,
 338 };
 339
 340 static PyObject *py_tevent_context_add_signal(TeventContext_Object *self, PyObject *args)
 341 {
 342         int signum, sa_flags;
 343         PyObject *handler;
 344         struct tevent_signal *sig;
 345         TeventSignal_Object *ret;
 346
 347         if (!PyArg_ParseTuple(args, "iiO", &signum, &sa_flags, &handler))
 348                 return NULL;
 349
 350         Py_INCREF(handler);
 351         sig = tevent_add_signal(self->ev, NULL, signum, sa_flags,
 352                                                         py_tevent_signal_handler, handler);
 353
 354         ret = PyObject_New(TeventSignal_Object, &TeventSignal_Type);
 355         if (ret == NULL) {
 356                 PyErr_NoMemory();
 357                 talloc_free(sig);
 358                 return NULL;
 359         }
 360
 361         ret->signal = sig;
 362
 363         return (PyObject *)ret;
 364 }
 365
 366 static void py_timer_handler(struct tevent_context *ev,
 367                                        struct tevent_timer *te,
 368                                        struct timeval current_time,
 369                                        void *private_data)
 370 {
 371         PyObject *callback = private_data, *ret;
 372         ret = PyObject_CallFunction(callback, "l", te);
 373         Py_XDECREF(ret);
 374 }
 375
 376 static PyObject *py_tevent_context_add_timer(TeventContext_Object *self, PyObject *args)
 377 {
 378         TeventTimer_Object *ret;
 379         struct timeval next_event;
 380         struct tevent_timer *timer;
 381         PyObject *handler;
 382         if (!PyArg_ParseTuple(args, "lO", &next_event, &handler))
 383                 return NULL;
 384
 385         timer = tevent_add_timer(self->ev, NULL, next_event, py_timer_handler,
 386                                                          handler);
 387         if (timer == NULL) {
 388                 PyErr_SetNone(PyExc_RuntimeError);
 389                 return NULL;
 390         }
 391
 392         ret = PyObject_New(TeventTimer_Object, &TeventTimer_Type);
 393         if (ret == NULL) {
 394                 PyErr_NoMemory();
 395                 talloc_free(timer);
 396                 return NULL;
 397         }
 398         ret->timer = timer;
 399
 400         return (PyObject *)ret;
 401 }
 402
 403 static void py_fd_handler(struct tevent_context *ev,
 404                                     struct tevent_fd *fde,
 405                                     uint16_t flags,
 406                                     void *private_data)
 407 {
 408         PyObject *callback = private_data, *ret;
 409
 410         ret = PyObject_CallFunction(callback, "i", flags);
 411         Py_XDECREF(ret);
 412 }
 413
 414 static PyObject *py_tevent_context_add_fd(TeventContext_Object *self, PyObject *args)
 415 {
 416         int fd, flags;
 417         PyObject *handler;
 418         struct tevent_fd *tfd;
 419         TeventFd_Object *ret;
 420
 421         if (!PyArg_ParseTuple(args, "iiO", &fd, &flags, &handler))
 422                 return NULL;
 423
 424         tfd = tevent_add_fd(self->ev, NULL, fd, flags, py_fd_handler, handler);
 425         if (tfd == NULL) {
 426                 PyErr_SetNone(PyExc_RuntimeError);
 427                 return NULL;
 428         }
 429
 430         ret = PyObject_New(TeventFd_Object, &TeventFd_Type);
 431         if (ret == NULL) {
 432                 talloc_free(tfd);
 433                 return NULL;
 434         }
 435         ret->fd = tfd;
 436
 437         return (PyObject *)ret;
 438 }
 439
 440 #ifdef TEVENT_DEPRECATED
 441 static PyObject *py_tevent_context_set_allow_nesting(TeventContext_Object *self)
 442 {
 443         tevent_loop_allow_nesting(self->ev);
 444         Py_RETURN_NONE;
 445 }
 446 #endif
 447
 448 static PyMethodDef py_tevent_context_methods[] = {
 449         { "reinitialise", (PyCFunction)py_tevent_context_reinitialise, METH_NOARGS,
 450                 "S.reinitialise()" },
 451         { "wakeup_send", (PyCFunction)py_tevent_context_wakeup_send,
 452                 METH_VARARGS, "S.wakeup_send(wakeup_time) -> req" },
 453         { "loop_wait", (PyCFunction)py_tevent_context_loop_wait,
 454                 METH_NOARGS, "S.loop_wait()" },
 455         { "loop_once", (PyCFunction)py_tevent_context_loop_once,
 456                 METH_NOARGS, "S.loop_once()" },
 457 #ifdef TEVENT_DEPRECATED
 458         { "loop_until", (PyCFunction)py_tevent_context_loop_until,
 459                 METH_VARARGS, "S.loop_until(callback)" },
 460 #endif
 461         { "add_signal", (PyCFunction)py_tevent_context_add_signal,
 462                 METH_VARARGS, "S.add_signal(signum, sa_flags, handler) -> signal" },
 463         { "add_timer", (PyCFunction)py_tevent_context_add_timer,
 464                 METH_VARARGS, "S.add_timer(next_event, handler) -> timer" },
 465         { "add_fd", (PyCFunction)py_tevent_context_add_fd,
 466                 METH_VARARGS, "S.add_fd(fd, flags, handler) -> fd" },
 467 #ifdef TEVENT_DEPRECATED
 468         { "allow_nesting", (PyCFunction)py_tevent_context_set_allow_nesting,
 469                 METH_NOARGS, "Whether to allow nested tevent loops." },
 470 #endif
 471         { NULL },
 472 };
 473
 474 static PyObject *py_tevent_req_wakeup_recv(PyObject *self)
 475 {
 476         /* FIXME */
 477         Py_RETURN_NONE;
 478 }
 479
 480 static PyObject *py_tevent_req_received(PyObject *self)
 481 {
 482         /* FIXME */
 483         Py_RETURN_NONE;
 484 }
 485
 486 static PyObject *py_tevent_req_is_error(PyObject *self)
 487 {
 488         /* FIXME */
 489         Py_RETURN_NONE;
 490 }
 491
 492 static PyObject *py_tevent_req_poll(PyObject *self)
 493 {
 494         /* FIXME */
 495         Py_RETURN_NONE;
 496 }
 497
 498 static PyObject *py_tevent_req_is_in_progress(PyObject *self)
 499 {
 500         /* FIXME */
 501         Py_RETURN_NONE;
 502 }
 503
 504 static PyGetSetDef py_tevent_req_getsetters[] = {
 505         { "in_progress", (getter)py_tevent_req_is_in_progress, NULL,
 506                 "Whether the request is in progress" },
 507         { NULL }
 508 };
 509
 510 static PyObject *py_tevent_req_post(PyObject *self, PyObject *args)
 511 {
 512         /* FIXME */
 513         Py_RETURN_NONE;
 514 }
 515
 516 static PyObject *py_tevent_req_set_error(PyObject *self, PyObject *args)
 517 {
 518         /* FIXME */
 519         Py_RETURN_NONE;
 520 }
 521
 522 static PyObject *py_tevent_req_done(PyObject *self)
 523 {
 524         /* FIXME */
 525         Py_RETURN_NONE;
 526 }
 527
 528 static PyObject *py_tevent_req_notify_callback(PyObject *self)
 529 {
 530         /* FIXME */
 531         Py_RETURN_NONE;
 532 }
 533
 534 static PyObject *py_tevent_req_set_endtime(PyObject *self, PyObject *args)
 535 {
 536         /* FIXME */
 537         Py_RETURN_NONE;
 538 }
 539
 540 static PyObject *py_tevent_req_cancel(TeventReq_Object *self)
 541 {
 542         if (!tevent_req_cancel(self->req)) {
 543                 PyErr_SetNone(PyExc_RuntimeError);
 544                 return NULL;
 545         }
 546         Py_RETURN_NONE;
 547 }
 548
 549 static PyMethodDef py_tevent_req_methods[] = {
 550         { "wakeup_recv", (PyCFunction)py_tevent_req_wakeup_recv, METH_NOARGS,
 551                 "Wakeup received" },
 552         { "received", (PyCFunction)py_tevent_req_received, METH_NOARGS,
 553                 "Receive finished" },
 554         { "is_error", (PyCFunction)py_tevent_req_is_error, METH_NOARGS,
 555                 "is_error() -> (error, state)" },
 556         { "poll", (PyCFunction)py_tevent_req_poll, METH_VARARGS,
 557                 "poll(ctx)" },
 558         { "post", (PyCFunction)py_tevent_req_post, METH_VARARGS,
 559                 "post(ctx) -> req" },
 560         { "set_error", (PyCFunction)py_tevent_req_set_error, METH_VARARGS,
 561                 "set_error(error)" },
 562         { "done", (PyCFunction)py_tevent_req_done, METH_NOARGS,
 563                 "done()" },
 564         { "notify_callback", (PyCFunction)py_tevent_req_notify_callback,
 565                 METH_NOARGS, "notify_callback()" },
 566         { "set_endtime", (PyCFunction)py_tevent_req_set_endtime,
 567                 METH_VARARGS, "set_endtime(ctx, endtime)" },
 568         { "cancel", (PyCFunction)py_tevent_req_cancel,
 569                 METH_NOARGS, "cancel()" },
 570         { NULL }
 571 };
 572
 573 static void py_tevent_req_dealloc(TeventReq_Object *self)
 574 {
 575         talloc_free(self->req);
 576         PyObject_DEL(self);
 577 }
 578
 579 static PyTypeObject TeventReq_Type = {
 580         .tp_name = "tevent.Request",
 581         .tp_basicsize = sizeof(TeventReq_Object),
 582         .tp_methods = py_tevent_req_methods,
 583         .tp_dealloc = (destructor)py_tevent_req_dealloc,
 584         .tp_getset = py_tevent_req_getsetters,
 585         /* FIXME: .tp_new = py_tevent_req_new, */
 586 };
 587
 588 static PyObject *py_tevent_queue_get_length(TeventQueue_Object *self)
 589 {
 590         return PyInt_FromLong(tevent_queue_length(self->queue));
 591 }
 592
 593 static PyGetSetDef py_tevent_queue_getsetters[] = {
 594         { "length", (getter)py_tevent_queue_get_length,
 595                 NULL, "The number of elements in the queue." },
 596         { NULL },
 597 };
 598
 599 static void py_tevent_queue_dealloc(TeventQueue_Object *self)
 600 {
 601         talloc_free(self->queue);
 602         PyObject_Del(self);
 603 }
 604
 605 static PyTypeObject TeventQueue_Type = {
 606         .tp_name = "tevent.Queue",
 607         .tp_basicsize = sizeof(TeventQueue_Object),
 608         .tp_dealloc = (destructor)py_tevent_queue_dealloc,
 609         .tp_flags = Py_TPFLAGS_DEFAULT,
 610         .tp_getset = py_tevent_queue_getsetters,
 611         .tp_methods = py_tevent_queue_methods,
 612 };
 613
 614 static PyObject *py_tevent_context_signal_support(PyObject *_self)
 615 {
 616         TeventContext_Object *self = (TeventContext_Object *)_self;
 617         return PyBool_FromLong(tevent_signal_support(self->ev));
 618 }
 619
 620 static PyGetSetDef py_tevent_context_getsetters[] = {
 621         { "signal_support", (getter)py_tevent_context_signal_support,
 622                 NULL, "if this platform and tevent context support signal handling" },
 623         { NULL }
 624 };
 625
 626 static void py_tevent_context_dealloc(TeventContext_Object *self)
 627 {
 628         talloc_free(self->ev);
 629         PyObject_Del(self);
 630 }
 631
 632 static PyObject *py_tevent_context_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
 633 {
 634         const char * const kwnames[] = { "name", NULL };
 635         char *name = NULL;
 636         struct tevent_context *ev;
 637         TeventContext_Object *ret;
 638
 639         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|s", kwnames, &name))
 640                 return NULL;
 641
 642         if (name == NULL) {
 643                 ev = tevent_context_init(NULL);
 644         } else {
 645                 ev = tevent_context_init_byname(NULL, name);
 646         }
 647
 648         if (ev == NULL) {
 649                 PyErr_SetNone(PyExc_RuntimeError);
 650                 return NULL;
 651         }
 652
 653         ret = PyObject_New(TeventContext_Object, type);
 654         if (ret == NULL) {
 655                 PyErr_NoMemory();
 656                 talloc_free(ev);
 657                 return NULL;
 658         }
 659
 660         ret->ev = ev;
 661         return (PyObject *)ret;
 662 }
 663
 664 static PyTypeObject TeventContext_Type = {
 665         .tp_name = "tevent.Context",
 666         .tp_new = py_tevent_context_new,
 667         .tp_basicsize = sizeof(TeventContext_Object),
 668         .tp_dealloc = (destructor)py_tevent_context_dealloc,
 669         .tp_methods = py_tevent_context_methods,
 670         .tp_getset = py_tevent_context_getsetters,
 671         .tp_flags = Py_TPFLAGS_DEFAULT,
 672 };
 673
 674 static PyObject *py_set_default_backend(PyObject *self, PyObject *args)
 675 {
 676         char *backend_name;
 677         if (!PyArg_ParseTuple(args, "s", &backend_name))
 678                 return NULL;
 679
 680         tevent_set_default_backend(backend_name);
 681
 682         Py_RETURN_NONE;
 683 }
 684
 685 static PyObject *py_backend_list(PyObject *self)
 686 {
 687         PyObject *ret;
 688         int i;
 689         const char **backends;
 690
 691         ret = PyList_New(0);
 692         if (ret == NULL) {
 693                 return NULL;
 694         }
 695
 696         backends = tevent_backend_list(NULL);
 697         if (backends == NULL) {
 698                 PyErr_SetNone(PyExc_RuntimeError);
 699                 Py_DECREF(ret);
 700                 return NULL;
 701         }
 702         for (i = 0; backends[i]; i++) {
 703                 PyList_Append(ret, PyString_FromString(backends[i]));
 704         }
 705
 706         talloc_free(backends);
 707
 708         return ret;
 709 }
 710
 711 static PyMethodDef tevent_methods[] = {
 712         { "register_backend", (PyCFunction)py_register_backend, METH_VARARGS,
 713                 "register_backend(backend)" },
 714         { "set_default_backend", (PyCFunction)py_set_default_backend,
 715                 METH_VARARGS, "set_default_backend(backend)" },
 716         { "backend_list", (PyCFunction)py_backend_list,
 717                 METH_NOARGS, "backend_list() -> list" },
 718         { NULL },
 719 };
 720
 721 void init_tevent(void)
 722 {
 723         PyObject *m;
 724
 725         if (PyType_Ready(&TeventContext_Type) < 0)
 726                 return;
 727
 728         if (PyType_Ready(&TeventQueue_Type) < 0)
 729                 return;
 730
 731         if (PyType_Ready(&TeventReq_Type) < 0)
 732                 return;
 733
 734         if (PyType_Ready(&TeventSignal_Type) < 0)
 735                 return;
 736
 737         if (PyType_Ready(&TeventTimer_Type) < 0)
 738                 return;
 739
 740         if (PyType_Ready(&TeventFd_Type) < 0)
 741                 return;
 742
 743         m = Py_InitModule3("_tevent", tevent_methods, "Tevent integration for twisted.");
 744         if (m == NULL)
 745                 return;
 746
 747         Py_INCREF(&TeventContext_Type);
 748         PyModule_AddObject(m, "Context", (PyObject *)&TeventContext_Type);
 749
 750         Py_INCREF(&TeventQueue_Type);
 751         PyModule_AddObject(m, "Queue", (PyObject *)&TeventQueue_Type);
 752
 753         Py_INCREF(&TeventReq_Type);
 754         PyModule_AddObject(m, "Request", (PyObject *)&TeventReq_Type);
 755
 756         Py_INCREF(&TeventSignal_Type);
 757         PyModule_AddObject(m, "Signal", (PyObject *)&TeventSignal_Type);
 758
 759         Py_INCREF(&TeventTimer_Type);
 760         PyModule_AddObject(m, "Timer", (PyObject *)&TeventTimer_Type);
 761
 762         Py_INCREF(&TeventFd_Type);
 763         PyModule_AddObject(m, "Fd", (PyObject *)&TeventFd_Type);
 764
 765         PyModule_AddObject(m, "__version__", PyString_FromString(PACKAGE_VERSION));
 766 }