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1/*
2 * This file is part of the libsigrok project.
3 *
4 * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
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 <stdio.h>
21#include <stdlib.h>
22#include <unistd.h>
23#include <string.h>
24#include <glib.h>
25#include "libsigrok.h"
26#include "libsigrok-internal.h"
27
28#define LOG_PREFIX "session"
29
30/**
31 * @file
32 *
33 * Creating, using, or destroying libsigrok sessions.
34 */
35
36/**
37 * @defgroup grp_session Session handling
38 *
39 * Creating, using, or destroying libsigrok sessions.
40 *
41 * @{
42 */
43
44struct source {
45 int timeout;
46 sr_receive_data_callback_t cb;
47 void *cb_data;
48
49 /* This is used to keep track of the object (fd, pollfd or channel) which is
50 * being polled and will be used to match the source when removing it again.
51 */
52 gintptr poll_object;
53};
54
55struct datafeed_callback {
56 sr_datafeed_callback_t cb;
57 void *cb_data;
58};
59
60/* There can only be one session at a time. */
61/* 'session' is not static, it's used elsewhere (via 'extern'). */
62struct sr_session *session;
63
64/**
65 * Create a new session.
66 *
67 * @todo Should it use the file-global "session" variable or take an argument?
68 * The same question applies to all the other session functions.
69 *
70 * @retval NULL Error.
71 * @retval other A pointer to the newly allocated session.
72 */
73SR_API struct sr_session *sr_session_new(void)
74{
75 if (!(session = g_try_malloc0(sizeof(struct sr_session)))) {
76 sr_err("Session malloc failed.");
77 return NULL;
78 }
79
80 session->source_timeout = -1;
81 session->running = FALSE;
82 session->abort_session = FALSE;
83 g_mutex_init(&session->stop_mutex);
84
85 return session;
86}
87
88/**
89 * Destroy the current session.
90 * This frees up all memory used by the session.
91 *
92 * @retval SR_OK Success.
93 * @retval SR_ERR_BUG No session exists.
94 */
95SR_API int sr_session_destroy(void)
96{
97 if (!session) {
98 sr_err("%s: session was NULL", __func__);
99 return SR_ERR_BUG;
100 }
101
102 sr_session_dev_remove_all();
103
104 /* TODO: Error checks needed? */
105
106 g_mutex_clear(&session->stop_mutex);
107
108 g_free(session);
109 session = NULL;
110
111 return SR_OK;
112}
113
114/**
115 * Remove all the devices from the current session.
116 *
117 * The session itself (i.e., the struct sr_session) is not free'd and still
118 * exists after this function returns.
119 *
120 * @retval SR_OK Success.
121 * @retval SR_ERR_BUG No session exists.
122 */
123SR_API int sr_session_dev_remove_all(void)
124{
125 if (!session) {
126 sr_err("%s: session was NULL", __func__);
127 return SR_ERR_BUG;
128 }
129
130 g_slist_free(session->devs);
131 session->devs = NULL;
132
133 return SR_OK;
134}
135
136/**
137 * Add a device instance to the current session.
138 *
139 * @param sdi The device instance to add to the current session. Must not
140 * be NULL. Also, sdi->driver and sdi->driver->dev_open must
141 * not be NULL.
142 *
143 * @retval SR_OK Success.
144 * @retval SR_ERR_ARG Invalid argument.
145 * @retval SR_ERR_BUG No session exists.
146 */
147SR_API int sr_session_dev_add(const struct sr_dev_inst *sdi)
148{
149 int ret;
150
151 if (!sdi) {
152 sr_err("%s: sdi was NULL", __func__);
153 return SR_ERR_ARG;
154 }
155
156 if (!session) {
157 sr_err("%s: session was NULL", __func__);
158 return SR_ERR_BUG;
159 }
160
161 /* If sdi->driver is NULL, this is a virtual device. */
162 if (!sdi->driver) {
163 sr_dbg("%s: sdi->driver was NULL, this seems to be "
164 "a virtual device; continuing", __func__);
165 /* Just add the device, don't run dev_open(). */
166 session->devs = g_slist_append(session->devs, (gpointer)sdi);
167 return SR_OK;
168 }
169
170 /* sdi->driver is non-NULL (i.e. we have a real device). */
171 if (!sdi->driver->dev_open) {
172 sr_err("%s: sdi->driver->dev_open was NULL", __func__);
173 return SR_ERR_BUG;
174 }
175
176 session->devs = g_slist_append(session->devs, (gpointer)sdi);
177
178 if (session->running) {
179 /* Adding a device to a running session. Commit settings
180 * and start acquisition on that device now. */
181 if ((ret = sr_config_commit(sdi)) != SR_OK) {
182 sr_err("Failed to commit device settings before "
183 "starting acquisition in running session (%s)",
184 sr_strerror(ret));
185 return ret;
186 }
187 if ((ret = sdi->driver->dev_acquisition_start(sdi,
188 (void *)sdi)) != SR_OK) {
189 sr_err("Failed to start acquisition of device in "
190 "running session (%s)", sr_strerror(ret));
191 return ret;
192 }
193 }
194
195 return SR_OK;
196}
197
198/**
199 * List all device instances attached to the current session.
200 *
201 * @param devlist A pointer where the device instance list will be
202 * stored on return. If no devices are in the session,
203 * this will be NULL. Each element in the list points
204 * to a struct sr_dev_inst *.
205 * The list must be freed by the caller, but not the
206 * elements pointed to.
207 *
208 * @retval SR_OK Success.
209 * @retval SR_ERR Invalid argument.
210 */
211SR_API int sr_session_dev_list(GSList **devlist)
212{
213
214 *devlist = NULL;
215
216 if (!session)
217 return SR_ERR;
218
219 *devlist = g_slist_copy(session->devs);
220
221 return SR_OK;
222}
223
224/**
225 * Remove all datafeed callbacks in the current session.
226 *
227 * @retval SR_OK Success.
228 * @retval SR_ERR_BUG No session exists.
229 */
230SR_API int sr_session_datafeed_callback_remove_all(void)
231{
232 if (!session) {
233 sr_err("%s: session was NULL", __func__);
234 return SR_ERR_BUG;
235 }
236
237 g_slist_free_full(session->datafeed_callbacks, g_free);
238 session->datafeed_callbacks = NULL;
239
240 return SR_OK;
241}
242
243/**
244 * Add a datafeed callback to the current session.
245 *
246 * @param cb Function to call when a chunk of data is received.
247 * Must not be NULL.
248 * @param cb_data Opaque pointer passed in by the caller.
249 *
250 * @retval SR_OK Success.
251 * @retval SR_ERR_BUG No session exists.
252 */
253SR_API int sr_session_datafeed_callback_add(sr_datafeed_callback_t cb, void *cb_data)
254{
255 struct datafeed_callback *cb_struct;
256
257 if (!session) {
258 sr_err("%s: session was NULL", __func__);
259 return SR_ERR_BUG;
260 }
261
262 if (!cb) {
263 sr_err("%s: cb was NULL", __func__);
264 return SR_ERR_ARG;
265 }
266
267 if (!(cb_struct = g_try_malloc0(sizeof(struct datafeed_callback))))
268 return SR_ERR_MALLOC;
269
270 cb_struct->cb = cb;
271 cb_struct->cb_data = cb_data;
272
273 session->datafeed_callbacks =
274 g_slist_append(session->datafeed_callbacks, cb_struct);
275
276 return SR_OK;
277}
278
279/**
280 * Call every device in the session's callback.
281 *
282 * For sessions not driven by select loops such as sr_session_run(),
283 * but driven by another scheduler, this can be used to poll the devices
284 * from within that scheduler.
285 *
286 * @param block If TRUE, this call will wait for any of the session's
287 * sources to fire an event on the file descriptors, or
288 * any of their timeouts to activate. In other words, this
289 * can be used as a select loop.
290 * If FALSE, all sources have their callback run, regardless
291 * of file descriptor or timeout status.
292 *
293 * @retval SR_OK Success.
294 * @retval SR_ERR Error occured.
295 */
296static int sr_session_iteration(gboolean block)
297{
298 unsigned int i;
299 int ret;
300
301 ret = g_poll(session->pollfds, session->num_sources,
302 block ? session->source_timeout : 0);
303 for (i = 0; i < session->num_sources; i++) {
304 if (session->pollfds[i].revents > 0 || (ret == 0
305 && session->source_timeout == session->sources[i].timeout)) {
306 /*
307 * Invoke the source's callback on an event,
308 * or if the poll timed out and this source
309 * asked for that timeout.
310 */
311 if (!session->sources[i].cb(session->pollfds[i].fd,
312 session->pollfds[i].revents,
313 session->sources[i].cb_data))
314 sr_session_source_remove(session->sources[i].poll_object);
315 }
316 /*
317 * We want to take as little time as possible to stop
318 * the session if we have been told to do so. Therefore,
319 * we check the flag after processing every source, not
320 * just once per main event loop.
321 */
322 g_mutex_lock(&session->stop_mutex);
323 if (session->abort_session) {
324 sr_session_stop_sync();
325 /* But once is enough. */
326 session->abort_session = FALSE;
327 }
328 g_mutex_unlock(&session->stop_mutex);
329 }
330
331 return SR_OK;
332}
333
334/**
335 * Start a session.
336 *
337 * There can only be one session at a time.
338 *
339 * @retval SR_OK Success.
340 * @retval SR_ERR Error occured.
341 */
342SR_API int sr_session_start(void)
343{
344 struct sr_dev_inst *sdi;
345 GSList *l;
346 int ret;
347
348 if (!session) {
349 sr_err("%s: session was NULL; a session must be "
350 "created before starting it.", __func__);
351 return SR_ERR_BUG;
352 }
353
354 if (!session->devs) {
355 sr_err("%s: session->devs was NULL; a session "
356 "cannot be started without devices.", __func__);
357 return SR_ERR_BUG;
358 }
359
360 sr_info("Starting.");
361
362 ret = SR_OK;
363 for (l = session->devs; l; l = l->next) {
364 sdi = l->data;
365 if ((ret = sr_config_commit(sdi)) != SR_OK) {
366 sr_err("Failed to commit device settings before "
367 "starting acquisition (%s)", sr_strerror(ret));
368 break;
369 }
370 if ((ret = sdi->driver->dev_acquisition_start(sdi, sdi)) != SR_OK) {
371 sr_err("%s: could not start an acquisition "
372 "(%s)", __func__, sr_strerror(ret));
373 break;
374 }
375 }
376
377 /* TODO: What if there are multiple devices? Which return code? */
378
379 return ret;
380}
381
382/**
383 * Run the session.
384 *
385 * @retval SR_OK Success.
386 * @retval SR_ERR_BUG Error occured.
387 */
388SR_API int sr_session_run(void)
389{
390 if (!session) {
391 sr_err("%s: session was NULL; a session must be "
392 "created first, before running it.", __func__);
393 return SR_ERR_BUG;
394 }
395
396 if (!session->devs) {
397 /* TODO: Actually the case? */
398 sr_err("%s: session->devs was NULL; a session "
399 "cannot be run without devices.", __func__);
400 return SR_ERR_BUG;
401 }
402 session->running = TRUE;
403
404 sr_info("Running.");
405
406 /* Do we have real sources? */
407 if (session->num_sources == 1 && session->pollfds[0].fd == -1) {
408 /* Dummy source, freewheel over it. */
409 while (session->num_sources)
410 session->sources[0].cb(-1, 0, session->sources[0].cb_data);
411 } else {
412 /* Real sources, use g_poll() main loop. */
413 while (session->num_sources)
414 sr_session_iteration(TRUE);
415 }
416
417 return SR_OK;
418}
419
420/**
421 * Stop the current session.
422 *
423 * The current session is stopped immediately, with all acquisition sessions
424 * being stopped and hardware drivers cleaned up.
425 *
426 * This must be called from within the session thread, to prevent freeing
427 * resources that the session thread will try to use.
428 *
429 * @retval SR_OK Success.
430 * @retval SR_ERR_BUG No session exists.
431 *
432 * @private
433 */
434SR_PRIV int sr_session_stop_sync(void)
435{
436 struct sr_dev_inst *sdi;
437 GSList *l;
438
439 if (!session) {
440 sr_err("%s: session was NULL", __func__);
441 return SR_ERR_BUG;
442 }
443
444 sr_info("Stopping.");
445
446 for (l = session->devs; l; l = l->next) {
447 sdi = l->data;
448 if (sdi->driver) {
449 if (sdi->driver->dev_acquisition_stop)
450 sdi->driver->dev_acquisition_stop(sdi, sdi);
451 }
452 }
453 session->running = FALSE;
454
455 return SR_OK;
456}
457
458/**
459 * Stop the current session.
460 *
461 * The current session is stopped immediately, with all acquisition sessions
462 * being stopped and hardware drivers cleaned up.
463 *
464 * If the session is run in a separate thread, this function will not block
465 * until the session is finished executing. It is the caller's responsibility
466 * to wait for the session thread to return before assuming that the session is
467 * completely decommissioned.
468 *
469 * @retval SR_OK Success.
470 * @retval SR_ERR_BUG No session exists.
471 */
472SR_API int sr_session_stop(void)
473{
474 if (!session) {
475 sr_err("%s: session was NULL", __func__);
476 return SR_ERR_BUG;
477 }
478
479 g_mutex_lock(&session->stop_mutex);
480 session->abort_session = TRUE;
481 g_mutex_unlock(&session->stop_mutex);
482
483 return SR_OK;
484}
485
486/**
487 * Debug helper.
488 *
489 * @param packet The packet to show debugging information for.
490 */
491static void datafeed_dump(const struct sr_datafeed_packet *packet)
492{
493 const struct sr_datafeed_logic *logic;
494 const struct sr_datafeed_analog *analog;
495
496 switch (packet->type) {
497 case SR_DF_HEADER:
498 sr_dbg("bus: Received SR_DF_HEADER packet.");
499 break;
500 case SR_DF_TRIGGER:
501 sr_dbg("bus: Received SR_DF_TRIGGER packet.");
502 break;
503 case SR_DF_META:
504 sr_dbg("bus: Received SR_DF_META packet.");
505 break;
506 case SR_DF_LOGIC:
507 logic = packet->payload;
508 sr_dbg("bus: Received SR_DF_LOGIC packet (%" PRIu64 " bytes).",
509 logic->length);
510 break;
511 case SR_DF_ANALOG:
512 analog = packet->payload;
513 sr_dbg("bus: Received SR_DF_ANALOG packet (%d samples).",
514 analog->num_samples);
515 break;
516 case SR_DF_END:
517 sr_dbg("bus: Received SR_DF_END packet.");
518 break;
519 case SR_DF_FRAME_BEGIN:
520 sr_dbg("bus: Received SR_DF_FRAME_BEGIN packet.");
521 break;
522 case SR_DF_FRAME_END:
523 sr_dbg("bus: Received SR_DF_FRAME_END packet.");
524 break;
525 default:
526 sr_dbg("bus: Received unknown packet type: %d.", packet->type);
527 break;
528 }
529}
530
531/**
532 * Send a packet to whatever is listening on the datafeed bus.
533 *
534 * Hardware drivers use this to send a data packet to the frontend.
535 *
536 * @param sdi TODO.
537 * @param packet The datafeed packet to send to the session bus.
538 *
539 * @retval SR_OK Success.
540 * @retval SR_ERR_ARG Invalid argument.
541 *
542 * @private
543 */
544SR_PRIV int sr_session_send(const struct sr_dev_inst *sdi,
545 const struct sr_datafeed_packet *packet)
546{
547 GSList *l;
548 struct datafeed_callback *cb_struct;
549
550 if (!sdi) {
551 sr_err("%s: sdi was NULL", __func__);
552 return SR_ERR_ARG;
553 }
554
555 if (!packet) {
556 sr_err("%s: packet was NULL", __func__);
557 return SR_ERR_ARG;
558 }
559
560 for (l = session->datafeed_callbacks; l; l = l->next) {
561 if (sr_log_loglevel_get() >= SR_LOG_DBG)
562 datafeed_dump(packet);
563 cb_struct = l->data;
564 cb_struct->cb(sdi, packet, cb_struct->cb_data);
565 }
566
567 return SR_OK;
568}
569
570/**
571 * Add an event source for a file descriptor.
572 *
573 * @param pollfd The GPollFD.
574 * @param[in] timeout Max time to wait before the callback is called,
575 * ignored if 0.
576 * @param cb Callback function to add. Must not be NULL.
577 * @param cb_data Data for the callback function. Can be NULL.
578 * @param poll_object TODO.
579 *
580 * @retval SR_OK Success.
581 * @retval SR_ERR_ARG Invalid argument.
582 * @retval SR_ERR_MALLOC Memory allocation error.
583 */
584static int _sr_session_source_add(GPollFD *pollfd, int timeout,
585 sr_receive_data_callback_t cb, void *cb_data, gintptr poll_object)
586{
587 struct source *new_sources, *s;
588 GPollFD *new_pollfds;
589
590 if (!cb) {
591 sr_err("%s: cb was NULL", __func__);
592 return SR_ERR_ARG;
593 }
594
595 /* Note: cb_data can be NULL, that's not a bug. */
596
597 new_pollfds = g_try_realloc(session->pollfds,
598 sizeof(GPollFD) * (session->num_sources + 1));
599 if (!new_pollfds) {
600 sr_err("%s: new_pollfds malloc failed", __func__);
601 return SR_ERR_MALLOC;
602 }
603
604 new_sources = g_try_realloc(session->sources, sizeof(struct source) *
605 (session->num_sources + 1));
606 if (!new_sources) {
607 sr_err("%s: new_sources malloc failed", __func__);
608 return SR_ERR_MALLOC;
609 }
610
611 new_pollfds[session->num_sources] = *pollfd;
612 s = &new_sources[session->num_sources++];
613 s->timeout = timeout;
614 s->cb = cb;
615 s->cb_data = cb_data;
616 s->poll_object = poll_object;
617 session->pollfds = new_pollfds;
618 session->sources = new_sources;
619
620 if (timeout != session->source_timeout && timeout > 0
621 && (session->source_timeout == -1 || timeout < session->source_timeout))
622 session->source_timeout = timeout;
623
624 return SR_OK;
625}
626
627/**
628 * Add an event source for a file descriptor.
629 *
630 * @param fd The file descriptor.
631 * @param events Events to check for.
632 * @param timeout Max time to wait before the callback is called, ignored if 0.
633 * @param cb Callback function to add. Must not be NULL.
634 * @param cb_data Data for the callback function. Can be NULL.
635 *
636 * @retval SR_OK Success.
637 * @retval SR_ERR_ARG Invalid argument.
638 * @retval SR_ERR_MALLOC Memory allocation error.
639 */
640SR_API int sr_session_source_add(int fd, int events, int timeout,
641 sr_receive_data_callback_t cb, void *cb_data)
642{
643 GPollFD p;
644
645 p.fd = fd;
646 p.events = events;
647
648 return _sr_session_source_add(&p, timeout, cb, cb_data, (gintptr)fd);
649}
650
651/**
652 * Add an event source for a GPollFD.
653 *
654 * @param pollfd The GPollFD.
655 * @param timeout Max time to wait before the callback is called, ignored if 0.
656 * @param cb Callback function to add. Must not be NULL.
657 * @param cb_data Data for the callback function. Can be NULL.
658 *
659 * @retval SR_OK Success.
660 * @retval SR_ERR_ARG Invalid argument.
661 * @retval SR_ERR_MALLOC Memory allocation error.
662 */
663SR_API int sr_session_source_add_pollfd(GPollFD *pollfd, int timeout,
664 sr_receive_data_callback_t cb, void *cb_data)
665{
666 return _sr_session_source_add(pollfd, timeout, cb,
667 cb_data, (gintptr)pollfd);
668}
669
670/**
671 * Add an event source for a GIOChannel.
672 *
673 * @param channel The GIOChannel.
674 * @param events Events to poll on.
675 * @param timeout Max time to wait before the callback is called, ignored if 0.
676 * @param cb Callback function to add. Must not be NULL.
677 * @param cb_data Data for the callback function. Can be NULL.
678 *
679 * @retval SR_OK Success.
680 * @retval SR_ERR_ARG Invalid argument.
681 * @retval SR_ERR_MALLOC Memory allocation error.
682 */
683SR_API int sr_session_source_add_channel(GIOChannel *channel, int events,
684 int timeout, sr_receive_data_callback_t cb, void *cb_data)
685{
686 GPollFD p;
687
688#ifdef _WIN32
689 g_io_channel_win32_make_pollfd(channel, events, &p);
690#else
691 p.fd = g_io_channel_unix_get_fd(channel);
692 p.events = events;
693#endif
694
695 return _sr_session_source_add(&p, timeout, cb, cb_data, (gintptr)channel);
696}
697
698/**
699 * Remove the source belonging to the specified channel.
700 *
701 * @todo Add more error checks and logging.
702 *
703 * @param poll_object The channel for which the source should be removed.
704 *
705 * @retval SR_OK Success
706 * @retval SR_ERR_ARG Invalid arguments
707 * @retval SR_ERR_MALLOC Memory allocation error
708 * @retval SR_ERR_BUG Internal error
709 */
710static int _sr_session_source_remove(gintptr poll_object)
711{
712 struct source *new_sources;
713 GPollFD *new_pollfds;
714 unsigned int old;
715
716 if (!session->sources || !session->num_sources) {
717 sr_err("%s: sources was NULL", __func__);
718 return SR_ERR_BUG;
719 }
720
721 for (old = 0; old < session->num_sources; old++) {
722 if (session->sources[old].poll_object == poll_object)
723 break;
724 }
725
726 /* fd not found, nothing to do */
727 if (old == session->num_sources)
728 return SR_OK;
729
730 session->num_sources -= 1;
731
732 if (old != session->num_sources) {
733 memmove(&session->pollfds[old], &session->pollfds[old+1],
734 (session->num_sources - old) * sizeof(GPollFD));
735 memmove(&session->sources[old], &session->sources[old+1],
736 (session->num_sources - old) * sizeof(struct source));
737 }
738
739 new_pollfds = g_try_realloc(session->pollfds, sizeof(GPollFD) * session->num_sources);
740 if (!new_pollfds && session->num_sources > 0) {
741 sr_err("%s: new_pollfds malloc failed", __func__);
742 return SR_ERR_MALLOC;
743 }
744
745 new_sources = g_try_realloc(session->sources, sizeof(struct source) * session->num_sources);
746 if (!new_sources && session->num_sources > 0) {
747 sr_err("%s: new_sources malloc failed", __func__);
748 return SR_ERR_MALLOC;
749 }
750
751 session->pollfds = new_pollfds;
752 session->sources = new_sources;
753
754 return SR_OK;
755}
756
757/**
758 * Remove the source belonging to the specified file descriptor.
759 *
760 * @param fd The file descriptor for which the source should be removed.
761 *
762 * @retval SR_OK Success
763 * @retval SR_ERR_ARG Invalid argument
764 * @retval SR_ERR_MALLOC Memory allocation error.
765 * @retval SR_ERR_BUG Internal error.
766 */
767SR_API int sr_session_source_remove(int fd)
768{
769 return _sr_session_source_remove((gintptr)fd);
770}
771
772/**
773 * Remove the source belonging to the specified poll descriptor.
774 *
775 * @param pollfd The poll descriptor for which the source should be removed.
776 *
777 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or
778 * SR_ERR_MALLOC upon memory allocation errors, SR_ERR_BUG upon
779 * internal errors.
780 */
781SR_API int sr_session_source_remove_pollfd(GPollFD *pollfd)
782{
783 return _sr_session_source_remove((gintptr)pollfd);
784}
785
786/**
787 * Remove the source belonging to the specified channel.
788 *
789 * @param channel The channel for which the source should be removed.
790 *
791 * @retval SR_OK Success.
792 * @retval SR_ERR_ARG Invalid argument.
793 * @retval SR_ERR_MALLOC Memory allocation error.
794 * @return SR_ERR_BUG Internal error.
795 */
796SR_API int sr_session_source_remove_channel(GIOChannel *channel)
797{
798 return _sr_session_source_remove((gintptr)channel);
799}
800
801/** @} */