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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 | * Copyright (C) 2015 Daniel Elstner <daniel.kitta@gmail.com> | |
6 | * | |
7 | * This program is free software: you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation, either version 3 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #include <config.h> | |
22 | #include <errno.h> | |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
25 | #include <unistd.h> | |
26 | #include <string.h> | |
27 | #include <glib.h> | |
28 | #include <libsigrok/libsigrok.h> | |
29 | #include "libsigrok-internal.h" | |
30 | ||
31 | /** @cond PRIVATE */ | |
32 | #define LOG_PREFIX "session" | |
33 | /** @endcond */ | |
34 | ||
35 | /** | |
36 | * @file | |
37 | * | |
38 | * Creating, using, or destroying libsigrok sessions. | |
39 | */ | |
40 | ||
41 | /** | |
42 | * @defgroup grp_session Session handling | |
43 | * | |
44 | * Creating, using, or destroying libsigrok sessions. | |
45 | * | |
46 | * @{ | |
47 | */ | |
48 | ||
49 | struct datafeed_callback { | |
50 | sr_datafeed_callback cb; | |
51 | void *cb_data; | |
52 | }; | |
53 | ||
54 | /** Custom GLib event source for generic descriptor I/O. | |
55 | * @see https://developer.gnome.org/glib/stable/glib-The-Main-Event-Loop.html | |
56 | * @internal | |
57 | */ | |
58 | struct fd_source { | |
59 | GSource base; | |
60 | ||
61 | int64_t timeout_us; | |
62 | int64_t due_us; | |
63 | ||
64 | /* Meta-data needed to keep track of installed sources */ | |
65 | struct sr_session *session; | |
66 | void *key; | |
67 | ||
68 | GPollFD pollfd; | |
69 | }; | |
70 | ||
71 | /** FD event source prepare() method. | |
72 | * This is called immediately before poll(). | |
73 | */ | |
74 | static gboolean fd_source_prepare(GSource *source, int *timeout) | |
75 | { | |
76 | int64_t now_us; | |
77 | struct fd_source *fsource; | |
78 | int remaining_ms; | |
79 | ||
80 | fsource = (struct fd_source *)source; | |
81 | ||
82 | if (fsource->timeout_us >= 0) { | |
83 | now_us = g_source_get_time(source); | |
84 | ||
85 | if (fsource->due_us == 0) { | |
86 | /* First-time initialization of the expiration time */ | |
87 | fsource->due_us = now_us + fsource->timeout_us; | |
88 | } | |
89 | remaining_ms = (MAX(0, fsource->due_us - now_us) + 999) / 1000; | |
90 | } else { | |
91 | remaining_ms = -1; | |
92 | } | |
93 | *timeout = remaining_ms; | |
94 | ||
95 | return (remaining_ms == 0); | |
96 | } | |
97 | ||
98 | /** FD event source check() method. | |
99 | * This is called after poll() returns to check whether an event fired. | |
100 | */ | |
101 | static gboolean fd_source_check(GSource *source) | |
102 | { | |
103 | struct fd_source *fsource; | |
104 | unsigned int revents; | |
105 | ||
106 | fsource = (struct fd_source *)source; | |
107 | revents = fsource->pollfd.revents; | |
108 | ||
109 | return (revents != 0 || (fsource->timeout_us >= 0 | |
110 | && fsource->due_us <= g_source_get_time(source))); | |
111 | } | |
112 | ||
113 | /** FD event source dispatch() method. | |
114 | * This is called if either prepare() or check() returned TRUE. | |
115 | */ | |
116 | static gboolean fd_source_dispatch(GSource *source, | |
117 | GSourceFunc callback, void *user_data) | |
118 | { | |
119 | struct fd_source *fsource; | |
120 | unsigned int revents; | |
121 | gboolean keep; | |
122 | ||
123 | fsource = (struct fd_source *)source; | |
124 | revents = fsource->pollfd.revents; | |
125 | ||
126 | if (!callback) { | |
127 | sr_err("Callback not set, cannot dispatch event."); | |
128 | return G_SOURCE_REMOVE; | |
129 | } | |
130 | keep = (*(sr_receive_data_callback)callback) | |
131 | (fsource->pollfd.fd, revents, user_data); | |
132 | ||
133 | if (fsource->timeout_us >= 0 && G_LIKELY(keep) | |
134 | && G_LIKELY(!g_source_is_destroyed(source))) | |
135 | fsource->due_us = g_source_get_time(source) | |
136 | + fsource->timeout_us; | |
137 | return keep; | |
138 | } | |
139 | ||
140 | /** FD event source finalize() method. | |
141 | */ | |
142 | static void fd_source_finalize(GSource *source) | |
143 | { | |
144 | struct fd_source *fsource; | |
145 | ||
146 | fsource = (struct fd_source *)source; | |
147 | ||
148 | sr_dbg("%s: key %p", __func__, fsource->key); | |
149 | ||
150 | sr_session_source_destroyed(fsource->session, fsource->key, source); | |
151 | } | |
152 | ||
153 | /** Create an event source for I/O on a file descriptor. | |
154 | * | |
155 | * In order to maintain API compatibility, this event source also doubles | |
156 | * as a timer event source. | |
157 | * | |
158 | * @param session The session the event source belongs to. | |
159 | * @param key The key used to identify this source. | |
160 | * @param fd The file descriptor or HANDLE. | |
161 | * @param timeout_ms The timeout interval in ms, or -1 to wait indefinitely. | |
162 | * @return A new event source object, or NULL on failure. | |
163 | */ | |
164 | static GSource *fd_source_new(struct sr_session *session, void *key, | |
165 | gintptr fd, int events, int timeout_ms) | |
166 | { | |
167 | static GSourceFuncs fd_source_funcs = { | |
168 | .prepare = &fd_source_prepare, | |
169 | .check = &fd_source_check, | |
170 | .dispatch = &fd_source_dispatch, | |
171 | .finalize = &fd_source_finalize | |
172 | }; | |
173 | GSource *source; | |
174 | struct fd_source *fsource; | |
175 | ||
176 | source = g_source_new(&fd_source_funcs, sizeof(struct fd_source)); | |
177 | fsource = (struct fd_source *)source; | |
178 | ||
179 | g_source_set_name(source, (fd < 0) ? "timer" : "fd"); | |
180 | ||
181 | if (timeout_ms >= 0) { | |
182 | fsource->timeout_us = 1000 * (int64_t)timeout_ms; | |
183 | fsource->due_us = 0; | |
184 | } else { | |
185 | fsource->timeout_us = -1; | |
186 | fsource->due_us = INT64_MAX; | |
187 | } | |
188 | fsource->session = session; | |
189 | fsource->key = key; | |
190 | ||
191 | fsource->pollfd.fd = fd; | |
192 | fsource->pollfd.events = events; | |
193 | fsource->pollfd.revents = 0; | |
194 | ||
195 | if (fd >= 0) | |
196 | g_source_add_poll(source, &fsource->pollfd); | |
197 | ||
198 | return source; | |
199 | } | |
200 | ||
201 | /** | |
202 | * Create a new session. | |
203 | * | |
204 | * @param ctx The context in which to create the new session. | |
205 | * @param new_session This will contain a pointer to the newly created | |
206 | * session if the return value is SR_OK, otherwise the value | |
207 | * is undefined and should not be used. Must not be NULL. | |
208 | * | |
209 | * @retval SR_OK Success. | |
210 | * @retval SR_ERR_ARG Invalid argument. | |
211 | * | |
212 | * @since 0.4.0 | |
213 | */ | |
214 | SR_API int sr_session_new(struct sr_context *ctx, | |
215 | struct sr_session **new_session) | |
216 | { | |
217 | struct sr_session *session; | |
218 | ||
219 | if (!new_session) | |
220 | return SR_ERR_ARG; | |
221 | ||
222 | session = g_malloc0(sizeof(struct sr_session)); | |
223 | ||
224 | session->ctx = ctx; | |
225 | ||
226 | g_mutex_init(&session->main_mutex); | |
227 | ||
228 | /* To maintain API compatibility, we need a lookup table | |
229 | * which maps poll_object IDs to GSource* pointers. | |
230 | */ | |
231 | session->event_sources = g_hash_table_new(NULL, NULL); | |
232 | ||
233 | *new_session = session; | |
234 | ||
235 | return SR_OK; | |
236 | } | |
237 | ||
238 | /** | |
239 | * Destroy a session. | |
240 | * This frees up all memory used by the session. | |
241 | * | |
242 | * @param session The session to destroy. Must not be NULL. | |
243 | * | |
244 | * @retval SR_OK Success. | |
245 | * @retval SR_ERR_ARG Invalid session passed. | |
246 | * | |
247 | * @since 0.4.0 | |
248 | */ | |
249 | SR_API int sr_session_destroy(struct sr_session *session) | |
250 | { | |
251 | if (!session) { | |
252 | sr_err("%s: session was NULL", __func__); | |
253 | return SR_ERR_ARG; | |
254 | } | |
255 | ||
256 | sr_session_dev_remove_all(session); | |
257 | g_slist_free_full(session->owned_devs, (GDestroyNotify)sr_dev_inst_free); | |
258 | ||
259 | sr_session_datafeed_callback_remove_all(session); | |
260 | ||
261 | g_hash_table_unref(session->event_sources); | |
262 | ||
263 | g_mutex_clear(&session->main_mutex); | |
264 | ||
265 | g_free(session); | |
266 | ||
267 | return SR_OK; | |
268 | } | |
269 | ||
270 | /** | |
271 | * Remove all the devices from a session. | |
272 | * | |
273 | * The session itself (i.e., the struct sr_session) is not free'd and still | |
274 | * exists after this function returns. | |
275 | * | |
276 | * @param session The session to use. Must not be NULL. | |
277 | * | |
278 | * @retval SR_OK Success. | |
279 | * @retval SR_ERR_BUG Invalid session passed. | |
280 | * | |
281 | * @since 0.4.0 | |
282 | */ | |
283 | SR_API int sr_session_dev_remove_all(struct sr_session *session) | |
284 | { | |
285 | struct sr_dev_inst *sdi; | |
286 | GSList *l; | |
287 | ||
288 | if (!session) { | |
289 | sr_err("%s: session was NULL", __func__); | |
290 | return SR_ERR_ARG; | |
291 | } | |
292 | ||
293 | for (l = session->devs; l; l = l->next) { | |
294 | sdi = (struct sr_dev_inst *) l->data; | |
295 | sdi->session = NULL; | |
296 | } | |
297 | ||
298 | g_slist_free(session->devs); | |
299 | session->devs = NULL; | |
300 | ||
301 | return SR_OK; | |
302 | } | |
303 | ||
304 | /** | |
305 | * Add a device instance to a session. | |
306 | * | |
307 | * @param session The session to add to. Must not be NULL. | |
308 | * @param sdi The device instance to add to a session. Must not | |
309 | * be NULL. Also, sdi->driver and sdi->driver->dev_open must | |
310 | * not be NULL. | |
311 | * | |
312 | * @retval SR_OK Success. | |
313 | * @retval SR_ERR_ARG Invalid argument. | |
314 | * | |
315 | * @since 0.4.0 | |
316 | */ | |
317 | SR_API int sr_session_dev_add(struct sr_session *session, | |
318 | struct sr_dev_inst *sdi) | |
319 | { | |
320 | int ret; | |
321 | ||
322 | if (!sdi) { | |
323 | sr_err("%s: sdi was NULL", __func__); | |
324 | return SR_ERR_ARG; | |
325 | } | |
326 | ||
327 | if (!session) { | |
328 | sr_err("%s: session was NULL", __func__); | |
329 | return SR_ERR_ARG; | |
330 | } | |
331 | ||
332 | /* If sdi->session is not NULL, the device is already in this or | |
333 | * another session. */ | |
334 | if (sdi->session) { | |
335 | sr_err("%s: already assigned to session", __func__); | |
336 | return SR_ERR_ARG; | |
337 | } | |
338 | ||
339 | /* If sdi->driver is NULL, this is a virtual device. */ | |
340 | if (!sdi->driver) { | |
341 | /* Just add the device, don't run dev_open(). */ | |
342 | session->devs = g_slist_append(session->devs, sdi); | |
343 | sdi->session = session; | |
344 | return SR_OK; | |
345 | } | |
346 | ||
347 | /* sdi->driver is non-NULL (i.e. we have a real device). */ | |
348 | if (!sdi->driver->dev_open) { | |
349 | sr_err("%s: sdi->driver->dev_open was NULL", __func__); | |
350 | return SR_ERR_BUG; | |
351 | } | |
352 | ||
353 | session->devs = g_slist_append(session->devs, sdi); | |
354 | sdi->session = session; | |
355 | ||
356 | /* TODO: This is invalid if the session runs in a different thread. | |
357 | * The usage semantics and restrictions need to be documented. | |
358 | */ | |
359 | if (session->running) { | |
360 | /* Adding a device to a running session. Commit settings | |
361 | * and start acquisition on that device now. */ | |
362 | if ((ret = sr_config_commit(sdi)) != SR_OK) { | |
363 | sr_err("Failed to commit device settings before " | |
364 | "starting acquisition in running session (%s)", | |
365 | sr_strerror(ret)); | |
366 | return ret; | |
367 | } | |
368 | if ((ret = sr_dev_acquisition_start(sdi)) != SR_OK) { | |
369 | sr_err("Failed to start acquisition of device in " | |
370 | "running session (%s)", sr_strerror(ret)); | |
371 | return ret; | |
372 | } | |
373 | } | |
374 | ||
375 | return SR_OK; | |
376 | } | |
377 | ||
378 | /** | |
379 | * List all device instances attached to a session. | |
380 | * | |
381 | * @param session The session to use. Must not be NULL. | |
382 | * @param devlist A pointer where the device instance list will be | |
383 | * stored on return. If no devices are in the session, | |
384 | * this will be NULL. Each element in the list points | |
385 | * to a struct sr_dev_inst *. | |
386 | * The list must be freed by the caller, but not the | |
387 | * elements pointed to. | |
388 | * | |
389 | * @retval SR_OK Success. | |
390 | * @retval SR_ERR_ARG Invalid argument. | |
391 | * | |
392 | * @since 0.4.0 | |
393 | */ | |
394 | SR_API int sr_session_dev_list(struct sr_session *session, GSList **devlist) | |
395 | { | |
396 | if (!session) | |
397 | return SR_ERR_ARG; | |
398 | ||
399 | if (!devlist) | |
400 | return SR_ERR_ARG; | |
401 | ||
402 | *devlist = g_slist_copy(session->devs); | |
403 | ||
404 | return SR_OK; | |
405 | } | |
406 | ||
407 | /** | |
408 | * Remove a device instance from a session. | |
409 | * | |
410 | * @param session The session to remove from. Must not be NULL. | |
411 | * @param sdi The device instance to remove from a session. Must not | |
412 | * be NULL. Also, sdi->driver and sdi->driver->dev_open must | |
413 | * not be NULL. | |
414 | * | |
415 | * @retval SR_OK Success. | |
416 | * @retval SR_ERR_ARG Invalid argument. | |
417 | * | |
418 | * @since 0.4.0 | |
419 | */ | |
420 | SR_API int sr_session_dev_remove(struct sr_session *session, | |
421 | struct sr_dev_inst *sdi) | |
422 | { | |
423 | if (!sdi) { | |
424 | sr_err("%s: sdi was NULL", __func__); | |
425 | return SR_ERR_ARG; | |
426 | } | |
427 | ||
428 | if (!session) { | |
429 | sr_err("%s: session was NULL", __func__); | |
430 | return SR_ERR_ARG; | |
431 | } | |
432 | ||
433 | /* If sdi->session is not session, the device is not in this | |
434 | * session. */ | |
435 | if (sdi->session != session) { | |
436 | sr_err("%s: not assigned to this session", __func__); | |
437 | return SR_ERR_ARG; | |
438 | } | |
439 | ||
440 | session->devs = g_slist_remove(session->devs, sdi); | |
441 | sdi->session = NULL; | |
442 | ||
443 | return SR_OK; | |
444 | } | |
445 | ||
446 | /** | |
447 | * Remove all datafeed callbacks in a session. | |
448 | * | |
449 | * @param session The session to use. Must not be NULL. | |
450 | * | |
451 | * @retval SR_OK Success. | |
452 | * @retval SR_ERR_ARG Invalid session passed. | |
453 | * | |
454 | * @since 0.4.0 | |
455 | */ | |
456 | SR_API int sr_session_datafeed_callback_remove_all(struct sr_session *session) | |
457 | { | |
458 | if (!session) { | |
459 | sr_err("%s: session was NULL", __func__); | |
460 | return SR_ERR_ARG; | |
461 | } | |
462 | ||
463 | g_slist_free_full(session->datafeed_callbacks, g_free); | |
464 | session->datafeed_callbacks = NULL; | |
465 | ||
466 | return SR_OK; | |
467 | } | |
468 | ||
469 | /** | |
470 | * Add a datafeed callback to a session. | |
471 | * | |
472 | * @param session The session to use. Must not be NULL. | |
473 | * @param cb Function to call when a chunk of data is received. | |
474 | * Must not be NULL. | |
475 | * @param cb_data Opaque pointer passed in by the caller. | |
476 | * | |
477 | * @retval SR_OK Success. | |
478 | * @retval SR_ERR_BUG No session exists. | |
479 | * | |
480 | * @since 0.3.0 | |
481 | */ | |
482 | SR_API int sr_session_datafeed_callback_add(struct sr_session *session, | |
483 | sr_datafeed_callback cb, void *cb_data) | |
484 | { | |
485 | struct datafeed_callback *cb_struct; | |
486 | ||
487 | if (!session) { | |
488 | sr_err("%s: session was NULL", __func__); | |
489 | return SR_ERR_BUG; | |
490 | } | |
491 | ||
492 | if (!cb) { | |
493 | sr_err("%s: cb was NULL", __func__); | |
494 | return SR_ERR_ARG; | |
495 | } | |
496 | ||
497 | cb_struct = g_malloc0(sizeof(struct datafeed_callback)); | |
498 | cb_struct->cb = cb; | |
499 | cb_struct->cb_data = cb_data; | |
500 | ||
501 | session->datafeed_callbacks = | |
502 | g_slist_append(session->datafeed_callbacks, cb_struct); | |
503 | ||
504 | return SR_OK; | |
505 | } | |
506 | ||
507 | /** | |
508 | * Get the trigger assigned to this session. | |
509 | * | |
510 | * @param session The session to use. | |
511 | * | |
512 | * @retval NULL Invalid (NULL) session was passed to the function. | |
513 | * @retval other The trigger assigned to this session (can be NULL). | |
514 | * | |
515 | * @since 0.4.0 | |
516 | */ | |
517 | SR_API struct sr_trigger *sr_session_trigger_get(struct sr_session *session) | |
518 | { | |
519 | if (!session) | |
520 | return NULL; | |
521 | ||
522 | return session->trigger; | |
523 | } | |
524 | ||
525 | /** | |
526 | * Set the trigger of this session. | |
527 | * | |
528 | * @param session The session to use. Must not be NULL. | |
529 | * @param trig The trigger to assign to this session. Can be NULL. | |
530 | * | |
531 | * @retval SR_OK Success. | |
532 | * @retval SR_ERR_ARG Invalid argument. | |
533 | * | |
534 | * @since 0.4.0 | |
535 | */ | |
536 | SR_API int sr_session_trigger_set(struct sr_session *session, struct sr_trigger *trig) | |
537 | { | |
538 | if (!session) | |
539 | return SR_ERR_ARG; | |
540 | ||
541 | session->trigger = trig; | |
542 | ||
543 | return SR_OK; | |
544 | } | |
545 | ||
546 | static int verify_trigger(struct sr_trigger *trigger) | |
547 | { | |
548 | struct sr_trigger_stage *stage; | |
549 | struct sr_trigger_match *match; | |
550 | GSList *l, *m; | |
551 | ||
552 | if (!trigger->stages) { | |
553 | sr_err("No trigger stages defined."); | |
554 | return SR_ERR; | |
555 | } | |
556 | ||
557 | sr_spew("Checking trigger:"); | |
558 | for (l = trigger->stages; l; l = l->next) { | |
559 | stage = l->data; | |
560 | if (!stage->matches) { | |
561 | sr_err("Stage %d has no matches defined.", stage->stage); | |
562 | return SR_ERR; | |
563 | } | |
564 | for (m = stage->matches; m; m = m->next) { | |
565 | match = m->data; | |
566 | if (!match->channel) { | |
567 | sr_err("Stage %d match has no channel.", stage->stage); | |
568 | return SR_ERR; | |
569 | } | |
570 | if (!match->match) { | |
571 | sr_err("Stage %d match is not defined.", stage->stage); | |
572 | return SR_ERR; | |
573 | } | |
574 | sr_spew("Stage %d match on channel %s, match %d", stage->stage, | |
575 | match->channel->name, match->match); | |
576 | } | |
577 | } | |
578 | ||
579 | return SR_OK; | |
580 | } | |
581 | ||
582 | /** Set up the main context the session will be executing in. | |
583 | * | |
584 | * Must be called just before the session starts, by the thread which | |
585 | * will execute the session main loop. Once acquired, the main context | |
586 | * pointer is immutable for the duration of the session run. | |
587 | */ | |
588 | static int set_main_context(struct sr_session *session) | |
589 | { | |
590 | GMainContext *main_context; | |
591 | ||
592 | g_mutex_lock(&session->main_mutex); | |
593 | ||
594 | /* May happen if sr_session_start() is called a second time | |
595 | * while the session is still running. | |
596 | */ | |
597 | if (session->main_context) { | |
598 | sr_err("Main context already set."); | |
599 | ||
600 | g_mutex_unlock(&session->main_mutex); | |
601 | return SR_ERR; | |
602 | } | |
603 | main_context = g_main_context_ref_thread_default(); | |
604 | /* | |
605 | * Try to use an existing main context if possible, but only if we | |
606 | * can make it owned by the current thread. Otherwise, create our | |
607 | * own main context so that event source callbacks can execute in | |
608 | * the session thread. | |
609 | */ | |
610 | if (g_main_context_acquire(main_context)) { | |
611 | g_main_context_release(main_context); | |
612 | ||
613 | sr_dbg("Using thread-default main context."); | |
614 | } else { | |
615 | g_main_context_unref(main_context); | |
616 | ||
617 | sr_dbg("Creating our own main context."); | |
618 | main_context = g_main_context_new(); | |
619 | } | |
620 | session->main_context = main_context; | |
621 | ||
622 | g_mutex_unlock(&session->main_mutex); | |
623 | ||
624 | return SR_OK; | |
625 | } | |
626 | ||
627 | /** Unset the main context used for the current session run. | |
628 | * | |
629 | * Must be called right after stopping the session. Note that if the | |
630 | * session is stopped asynchronously, the main loop may still be running | |
631 | * after the main context has been unset. This is OK as long as no new | |
632 | * event sources are created -- the main loop holds its own reference | |
633 | * to the main context. | |
634 | */ | |
635 | static int unset_main_context(struct sr_session *session) | |
636 | { | |
637 | int ret; | |
638 | ||
639 | g_mutex_lock(&session->main_mutex); | |
640 | ||
641 | if (session->main_context) { | |
642 | g_main_context_unref(session->main_context); | |
643 | session->main_context = NULL; | |
644 | ret = SR_OK; | |
645 | } else { | |
646 | /* May happen if the set/unset calls are not matched. | |
647 | */ | |
648 | sr_err("No main context to unset."); | |
649 | ret = SR_ERR; | |
650 | } | |
651 | g_mutex_unlock(&session->main_mutex); | |
652 | ||
653 | return ret; | |
654 | } | |
655 | ||
656 | static unsigned int session_source_attach(struct sr_session *session, | |
657 | GSource *source) | |
658 | { | |
659 | unsigned int id = 0; | |
660 | ||
661 | g_mutex_lock(&session->main_mutex); | |
662 | ||
663 | if (session->main_context) | |
664 | id = g_source_attach(source, session->main_context); | |
665 | else | |
666 | sr_err("Cannot add event source without main context."); | |
667 | ||
668 | g_mutex_unlock(&session->main_mutex); | |
669 | ||
670 | return id; | |
671 | } | |
672 | ||
673 | /* Idle handler; invoked when the number of registered event sources | |
674 | * for a running session drops to zero. | |
675 | */ | |
676 | static gboolean delayed_stop_check(void *data) | |
677 | { | |
678 | struct sr_session *session; | |
679 | ||
680 | session = data; | |
681 | session->stop_check_id = 0; | |
682 | ||
683 | /* Session already ended? */ | |
684 | if (!session->running) | |
685 | return G_SOURCE_REMOVE; | |
686 | ||
687 | /* New event sources may have been installed in the meantime. */ | |
688 | if (g_hash_table_size(session->event_sources) != 0) | |
689 | return G_SOURCE_REMOVE; | |
690 | ||
691 | session->running = FALSE; | |
692 | unset_main_context(session); | |
693 | ||
694 | sr_info("Stopped."); | |
695 | ||
696 | /* This indicates a bug in user code, since it is not valid to | |
697 | * restart or destroy a session while it may still be running. | |
698 | */ | |
699 | if (!session->main_loop && !session->stopped_callback) { | |
700 | sr_err("BUG: Session stop left unhandled."); | |
701 | return G_SOURCE_REMOVE; | |
702 | } | |
703 | if (session->main_loop) | |
704 | g_main_loop_quit(session->main_loop); | |
705 | ||
706 | if (session->stopped_callback) | |
707 | (*session->stopped_callback)(session->stopped_cb_data); | |
708 | ||
709 | return G_SOURCE_REMOVE; | |
710 | } | |
711 | ||
712 | static int stop_check_later(struct sr_session *session) | |
713 | { | |
714 | GSource *source; | |
715 | unsigned int source_id; | |
716 | ||
717 | if (session->stop_check_id != 0) | |
718 | return SR_OK; /* idle handler already installed */ | |
719 | ||
720 | source = g_idle_source_new(); | |
721 | g_source_set_callback(source, &delayed_stop_check, session, NULL); | |
722 | ||
723 | source_id = session_source_attach(session, source); | |
724 | session->stop_check_id = source_id; | |
725 | ||
726 | g_source_unref(source); | |
727 | ||
728 | return (source_id != 0) ? SR_OK : SR_ERR; | |
729 | } | |
730 | ||
731 | /** | |
732 | * Start a session. | |
733 | * | |
734 | * When this function returns with a status code indicating success, the | |
735 | * session is running. Use sr_session_stopped_callback_set() to receive | |
736 | * notification upon completion, or call sr_session_run() to block until | |
737 | * the session stops. | |
738 | * | |
739 | * Session events will be processed in the context of the current thread. | |
740 | * If a thread-default GLib main context has been set, and is not owned by | |
741 | * any other thread, it will be used. Otherwise, libsigrok will create its | |
742 | * own main context for the current thread. | |
743 | * | |
744 | * @param session The session to use. Must not be NULL. | |
745 | * | |
746 | * @retval SR_OK Success. | |
747 | * @retval SR_ERR_ARG Invalid session passed. | |
748 | * @retval SR_ERR Other error. | |
749 | * | |
750 | * @since 0.4.0 | |
751 | */ | |
752 | SR_API int sr_session_start(struct sr_session *session) | |
753 | { | |
754 | struct sr_dev_inst *sdi; | |
755 | struct sr_channel *ch; | |
756 | GSList *l, *c, *lend; | |
757 | int ret; | |
758 | ||
759 | if (!session) { | |
760 | sr_err("%s: session was NULL", __func__); | |
761 | return SR_ERR_ARG; | |
762 | } | |
763 | ||
764 | if (!session->devs) { | |
765 | sr_err("%s: session->devs was NULL; a session " | |
766 | "cannot be started without devices.", __func__); | |
767 | return SR_ERR_ARG; | |
768 | } | |
769 | ||
770 | if (session->running) { | |
771 | sr_err("Cannot (re-)start session while it is still running."); | |
772 | return SR_ERR; | |
773 | } | |
774 | ||
775 | if (session->trigger) { | |
776 | ret = verify_trigger(session->trigger); | |
777 | if (ret != SR_OK) | |
778 | return ret; | |
779 | } | |
780 | ||
781 | /* Check enabled channels and commit settings of all devices. */ | |
782 | for (l = session->devs; l; l = l->next) { | |
783 | sdi = l->data; | |
784 | for (c = sdi->channels; c; c = c->next) { | |
785 | ch = c->data; | |
786 | if (ch->enabled) | |
787 | break; | |
788 | } | |
789 | if (!c) { | |
790 | sr_err("%s device %s has no enabled channels.", | |
791 | sdi->driver->name, sdi->connection_id); | |
792 | return SR_ERR; | |
793 | } | |
794 | ||
795 | ret = sr_config_commit(sdi); | |
796 | if (ret != SR_OK) { | |
797 | sr_err("Failed to commit %s device %s settings " | |
798 | "before starting acquisition.", | |
799 | sdi->driver->name, sdi->connection_id); | |
800 | return ret; | |
801 | } | |
802 | } | |
803 | ||
804 | ret = set_main_context(session); | |
805 | if (ret != SR_OK) | |
806 | return ret; | |
807 | ||
808 | sr_info("Starting."); | |
809 | ||
810 | session->running = TRUE; | |
811 | ||
812 | /* Have all devices start acquisition. */ | |
813 | for (l = session->devs; l; l = l->next) { | |
814 | if (!(sdi = l->data)) { | |
815 | sr_err("Device sdi was NULL, can't start session."); | |
816 | ret = SR_ERR; | |
817 | break; | |
818 | } | |
819 | ret = sr_dev_acquisition_start(sdi); | |
820 | if (ret != SR_OK) { | |
821 | sr_err("Could not start %s device %s acquisition.", | |
822 | sdi->driver->name, sdi->connection_id); | |
823 | break; | |
824 | } | |
825 | } | |
826 | ||
827 | if (ret != SR_OK) { | |
828 | /* If there are multiple devices, some of them may already have | |
829 | * started successfully. Stop them now before returning. */ | |
830 | lend = l->next; | |
831 | for (l = session->devs; l != lend; l = l->next) { | |
832 | sdi = l->data; | |
833 | sr_dev_acquisition_stop(sdi); | |
834 | } | |
835 | /* TODO: Handle delayed stops. Need to iterate the event | |
836 | * sources... */ | |
837 | session->running = FALSE; | |
838 | ||
839 | unset_main_context(session); | |
840 | return ret; | |
841 | } | |
842 | ||
843 | if (g_hash_table_size(session->event_sources) == 0) | |
844 | stop_check_later(session); | |
845 | ||
846 | return SR_OK; | |
847 | } | |
848 | ||
849 | /** | |
850 | * Block until the running session stops. | |
851 | * | |
852 | * This is a convenience function which creates a GLib main loop and runs | |
853 | * it to process session events until the session stops. | |
854 | * | |
855 | * Instead of using this function, applications may run their own GLib main | |
856 | * loop, and use sr_session_stopped_callback_set() to receive notification | |
857 | * when the session finished running. | |
858 | * | |
859 | * @param session The session to use. Must not be NULL. | |
860 | * | |
861 | * @retval SR_OK Success. | |
862 | * @retval SR_ERR_ARG Invalid session passed. | |
863 | * @retval SR_ERR Other error. | |
864 | * | |
865 | * @since 0.4.0 | |
866 | */ | |
867 | SR_API int sr_session_run(struct sr_session *session) | |
868 | { | |
869 | if (!session) { | |
870 | sr_err("%s: session was NULL", __func__); | |
871 | return SR_ERR_ARG; | |
872 | } | |
873 | if (!session->running) { | |
874 | sr_err("No session running."); | |
875 | return SR_ERR; | |
876 | } | |
877 | if (session->main_loop) { | |
878 | sr_err("Main loop already created."); | |
879 | return SR_ERR; | |
880 | } | |
881 | ||
882 | g_mutex_lock(&session->main_mutex); | |
883 | ||
884 | if (!session->main_context) { | |
885 | sr_err("Cannot run without main context."); | |
886 | g_mutex_unlock(&session->main_mutex); | |
887 | return SR_ERR; | |
888 | } | |
889 | session->main_loop = g_main_loop_new(session->main_context, FALSE); | |
890 | ||
891 | g_mutex_unlock(&session->main_mutex); | |
892 | ||
893 | g_main_loop_run(session->main_loop); | |
894 | ||
895 | g_main_loop_unref(session->main_loop); | |
896 | session->main_loop = NULL; | |
897 | ||
898 | return SR_OK; | |
899 | } | |
900 | ||
901 | static gboolean session_stop_sync(void *user_data) | |
902 | { | |
903 | struct sr_session *session; | |
904 | struct sr_dev_inst *sdi; | |
905 | GSList *node; | |
906 | ||
907 | session = user_data; | |
908 | ||
909 | if (!session->running) | |
910 | return G_SOURCE_REMOVE; | |
911 | ||
912 | sr_info("Stopping."); | |
913 | ||
914 | for (node = session->devs; node; node = node->next) { | |
915 | sdi = node->data; | |
916 | sr_dev_acquisition_stop(sdi); | |
917 | } | |
918 | ||
919 | return G_SOURCE_REMOVE; | |
920 | } | |
921 | ||
922 | /** | |
923 | * Stop a session. | |
924 | * | |
925 | * This requests the drivers of each device participating in the session to | |
926 | * abort the acquisition as soon as possible. Even after this function returns, | |
927 | * event processing still continues until all devices have actually stopped. | |
928 | * | |
929 | * Use sr_session_stopped_callback_set() to receive notification when the event | |
930 | * processing finished. | |
931 | * | |
932 | * This function is reentrant. That is, it may be called from a different | |
933 | * thread than the one executing the session, as long as it can be ensured | |
934 | * that the session object is valid. | |
935 | * | |
936 | * If the session is not running, sr_session_stop() silently does nothing. | |
937 | * | |
938 | * @param session The session to use. Must not be NULL. | |
939 | * | |
940 | * @retval SR_OK Success. | |
941 | * @retval SR_ERR_ARG Invalid session passed. | |
942 | * | |
943 | * @since 0.4.0 | |
944 | */ | |
945 | SR_API int sr_session_stop(struct sr_session *session) | |
946 | { | |
947 | GMainContext *main_context; | |
948 | ||
949 | if (!session) { | |
950 | sr_err("%s: session was NULL", __func__); | |
951 | return SR_ERR_ARG; | |
952 | } | |
953 | ||
954 | g_mutex_lock(&session->main_mutex); | |
955 | ||
956 | main_context = (session->main_context) | |
957 | ? g_main_context_ref(session->main_context) | |
958 | : NULL; | |
959 | ||
960 | g_mutex_unlock(&session->main_mutex); | |
961 | ||
962 | if (!main_context) { | |
963 | sr_dbg("No main context set; already stopped?"); | |
964 | /* Not an error; as it would be racy. */ | |
965 | return SR_OK; | |
966 | } | |
967 | g_main_context_invoke(main_context, &session_stop_sync, session); | |
968 | g_main_context_unref(main_context); | |
969 | ||
970 | return SR_OK; | |
971 | } | |
972 | ||
973 | /** | |
974 | * Return whether the session is currently running. | |
975 | * | |
976 | * Note that this function should be called from the same thread | |
977 | * the session was started in. | |
978 | * | |
979 | * @param session The session to use. Must not be NULL. | |
980 | * | |
981 | * @retval TRUE Session is running. | |
982 | * @retval FALSE Session is not running. | |
983 | * @retval SR_ERR_ARG Invalid session passed. | |
984 | * | |
985 | * @since 0.4.0 | |
986 | */ | |
987 | SR_API int sr_session_is_running(struct sr_session *session) | |
988 | { | |
989 | if (!session) { | |
990 | sr_err("%s: session was NULL", __func__); | |
991 | return SR_ERR_ARG; | |
992 | } | |
993 | return session->running; | |
994 | } | |
995 | ||
996 | /** | |
997 | * Set the callback to be invoked after a session stopped running. | |
998 | * | |
999 | * Install a callback to receive notification when a session run stopped. | |
1000 | * This can be used to integrate session execution with an existing main | |
1001 | * loop, without having to block in sr_session_run(). | |
1002 | * | |
1003 | * Note that the callback will be invoked in the context of the thread | |
1004 | * that calls sr_session_start(). | |
1005 | * | |
1006 | * @param session The session to use. Must not be NULL. | |
1007 | * @param cb The callback to invoke on session stop. May be NULL to unset. | |
1008 | * @param cb_data User data pointer to be passed to the callback. | |
1009 | * | |
1010 | * @retval SR_OK Success. | |
1011 | * @retval SR_ERR_ARG Invalid session passed. | |
1012 | * | |
1013 | * @since 0.4.0 | |
1014 | */ | |
1015 | SR_API int sr_session_stopped_callback_set(struct sr_session *session, | |
1016 | sr_session_stopped_callback cb, void *cb_data) | |
1017 | { | |
1018 | if (!session) { | |
1019 | sr_err("%s: session was NULL", __func__); | |
1020 | return SR_ERR_ARG; | |
1021 | } | |
1022 | session->stopped_callback = cb; | |
1023 | session->stopped_cb_data = cb_data; | |
1024 | ||
1025 | return SR_OK; | |
1026 | } | |
1027 | ||
1028 | /** | |
1029 | * Debug helper. | |
1030 | * | |
1031 | * @param packet The packet to show debugging information for. | |
1032 | */ | |
1033 | static void datafeed_dump(const struct sr_datafeed_packet *packet) | |
1034 | { | |
1035 | const struct sr_datafeed_logic *logic; | |
1036 | const struct sr_datafeed_analog *analog; | |
1037 | ||
1038 | /* Please use the same order as in libsigrok.h. */ | |
1039 | switch (packet->type) { | |
1040 | case SR_DF_HEADER: | |
1041 | sr_dbg("bus: Received SR_DF_HEADER packet."); | |
1042 | break; | |
1043 | case SR_DF_END: | |
1044 | sr_dbg("bus: Received SR_DF_END packet."); | |
1045 | break; | |
1046 | case SR_DF_META: | |
1047 | sr_dbg("bus: Received SR_DF_META packet."); | |
1048 | break; | |
1049 | case SR_DF_TRIGGER: | |
1050 | sr_dbg("bus: Received SR_DF_TRIGGER packet."); | |
1051 | break; | |
1052 | case SR_DF_LOGIC: | |
1053 | logic = packet->payload; | |
1054 | sr_dbg("bus: Received SR_DF_LOGIC packet (%" PRIu64 " bytes, " | |
1055 | "unitsize = %d).", logic->length, logic->unitsize); | |
1056 | break; | |
1057 | case SR_DF_FRAME_BEGIN: | |
1058 | sr_dbg("bus: Received SR_DF_FRAME_BEGIN packet."); | |
1059 | break; | |
1060 | case SR_DF_FRAME_END: | |
1061 | sr_dbg("bus: Received SR_DF_FRAME_END packet."); | |
1062 | break; | |
1063 | case SR_DF_ANALOG: | |
1064 | analog = packet->payload; | |
1065 | sr_dbg("bus: Received SR_DF_ANALOG packet (%d samples).", | |
1066 | analog->num_samples); | |
1067 | break; | |
1068 | default: | |
1069 | sr_dbg("bus: Received unknown packet type: %d.", packet->type); | |
1070 | break; | |
1071 | } | |
1072 | } | |
1073 | ||
1074 | /** | |
1075 | * Helper to send a meta datafeed package (SR_DF_META) to the session bus. | |
1076 | * | |
1077 | * @param sdi The device instance to send the package from. Must not be NULL. | |
1078 | * @param key The config key to send to the session bus. | |
1079 | * @param var The value to send to the session bus. | |
1080 | * | |
1081 | * @retval SR_OK Success. | |
1082 | * @retval SR_ERR_ARG Invalid argument. | |
1083 | * | |
1084 | * @private | |
1085 | */ | |
1086 | SR_PRIV int sr_session_send_meta(const struct sr_dev_inst *sdi, | |
1087 | uint32_t key, GVariant *var) | |
1088 | { | |
1089 | struct sr_config *cfg; | |
1090 | struct sr_datafeed_packet packet; | |
1091 | struct sr_datafeed_meta meta; | |
1092 | int ret; | |
1093 | ||
1094 | cfg = sr_config_new(key, var); | |
1095 | ||
1096 | memset(&meta, 0, sizeof(meta)); | |
1097 | ||
1098 | packet.type = SR_DF_META; | |
1099 | packet.payload = &meta; | |
1100 | ||
1101 | meta.config = g_slist_append(NULL, cfg); | |
1102 | ||
1103 | ret = sr_session_send(sdi, &packet); | |
1104 | g_slist_free(meta.config); | |
1105 | sr_config_free(cfg); | |
1106 | ||
1107 | return ret; | |
1108 | } | |
1109 | ||
1110 | /** | |
1111 | * Send a packet to whatever is listening on the datafeed bus. | |
1112 | * | |
1113 | * Hardware drivers use this to send a data packet to the frontend. | |
1114 | * | |
1115 | * @param sdi TODO. | |
1116 | * @param packet The datafeed packet to send to the session bus. | |
1117 | * | |
1118 | * @retval SR_OK Success. | |
1119 | * @retval SR_ERR_ARG Invalid argument. | |
1120 | * | |
1121 | * @private | |
1122 | */ | |
1123 | SR_PRIV int sr_session_send(const struct sr_dev_inst *sdi, | |
1124 | const struct sr_datafeed_packet *packet) | |
1125 | { | |
1126 | GSList *l; | |
1127 | struct datafeed_callback *cb_struct; | |
1128 | struct sr_datafeed_packet *packet_in, *packet_out; | |
1129 | struct sr_transform *t; | |
1130 | int ret; | |
1131 | ||
1132 | if (!sdi) { | |
1133 | sr_err("%s: sdi was NULL", __func__); | |
1134 | return SR_ERR_ARG; | |
1135 | } | |
1136 | ||
1137 | if (!packet) { | |
1138 | sr_err("%s: packet was NULL", __func__); | |
1139 | return SR_ERR_ARG; | |
1140 | } | |
1141 | ||
1142 | if (!sdi->session) { | |
1143 | sr_err("%s: session was NULL", __func__); | |
1144 | return SR_ERR_BUG; | |
1145 | } | |
1146 | ||
1147 | /* | |
1148 | * Pass the packet to the first transform module. If that returns | |
1149 | * another packet (instead of NULL), pass that packet to the next | |
1150 | * transform module in the list, and so on. | |
1151 | */ | |
1152 | packet_in = (struct sr_datafeed_packet *)packet; | |
1153 | for (l = sdi->session->transforms; l; l = l->next) { | |
1154 | t = l->data; | |
1155 | sr_spew("Running transform module '%s'.", t->module->id); | |
1156 | ret = t->module->receive(t, packet_in, &packet_out); | |
1157 | if (ret < 0) { | |
1158 | sr_err("Error while running transform module: %d.", ret); | |
1159 | return SR_ERR; | |
1160 | } | |
1161 | if (!packet_out) { | |
1162 | /* | |
1163 | * If any of the transforms don't return an output | |
1164 | * packet, abort. | |
1165 | */ | |
1166 | sr_spew("Transform module didn't return a packet, aborting."); | |
1167 | return SR_OK; | |
1168 | } else { | |
1169 | /* | |
1170 | * Use this transform module's output packet as input | |
1171 | * for the next transform module. | |
1172 | */ | |
1173 | packet_in = packet_out; | |
1174 | } | |
1175 | } | |
1176 | packet = packet_in; | |
1177 | ||
1178 | /* | |
1179 | * If the last transform did output a packet, pass it to all datafeed | |
1180 | * callbacks. | |
1181 | */ | |
1182 | for (l = sdi->session->datafeed_callbacks; l; l = l->next) { | |
1183 | if (sr_log_loglevel_get() >= SR_LOG_DBG) | |
1184 | datafeed_dump(packet); | |
1185 | cb_struct = l->data; | |
1186 | cb_struct->cb(sdi, packet, cb_struct->cb_data); | |
1187 | } | |
1188 | ||
1189 | return SR_OK; | |
1190 | } | |
1191 | ||
1192 | /** | |
1193 | * Add an event source for a file descriptor. | |
1194 | * | |
1195 | * @param session The session to use. Must not be NULL. | |
1196 | * @param key The key which identifies the event source. | |
1197 | * @param source An event source object. Must not be NULL. | |
1198 | * | |
1199 | * @retval SR_OK Success. | |
1200 | * @retval SR_ERR_ARG Invalid argument. | |
1201 | * @retval SR_ERR_BUG Event source with @a key already installed. | |
1202 | * @retval SR_ERR Other error. | |
1203 | * | |
1204 | * @private | |
1205 | */ | |
1206 | SR_PRIV int sr_session_source_add_internal(struct sr_session *session, | |
1207 | void *key, GSource *source) | |
1208 | { | |
1209 | /* | |
1210 | * This must not ever happen, since the source has already been | |
1211 | * created and its finalize() method will remove the key for the | |
1212 | * already installed source. (Well it would, if we did not have | |
1213 | * another sanity check there.) | |
1214 | */ | |
1215 | if (g_hash_table_contains(session->event_sources, key)) { | |
1216 | sr_err("Event source with key %p already exists.", key); | |
1217 | return SR_ERR_BUG; | |
1218 | } | |
1219 | g_hash_table_insert(session->event_sources, key, source); | |
1220 | ||
1221 | if (session_source_attach(session, source) == 0) | |
1222 | return SR_ERR; | |
1223 | ||
1224 | return SR_OK; | |
1225 | } | |
1226 | ||
1227 | /** @private */ | |
1228 | SR_PRIV int sr_session_fd_source_add(struct sr_session *session, | |
1229 | void *key, gintptr fd, int events, int timeout, | |
1230 | sr_receive_data_callback cb, void *cb_data) | |
1231 | { | |
1232 | GSource *source; | |
1233 | int ret; | |
1234 | ||
1235 | source = fd_source_new(session, key, fd, events, timeout); | |
1236 | if (!source) | |
1237 | return SR_ERR; | |
1238 | ||
1239 | g_source_set_callback(source, (GSourceFunc)cb, cb_data, NULL); | |
1240 | ||
1241 | ret = sr_session_source_add_internal(session, key, source); | |
1242 | g_source_unref(source); | |
1243 | ||
1244 | return ret; | |
1245 | } | |
1246 | ||
1247 | /** | |
1248 | * Add an event source for a file descriptor. | |
1249 | * | |
1250 | * @param session The session to use. Must not be NULL. | |
1251 | * @param fd The file descriptor, or a negative value to create a timer source. | |
1252 | * @param events Events to check for. | |
1253 | * @param timeout Max time in ms to wait before the callback is called, | |
1254 | * or -1 to wait indefinitely. | |
1255 | * @param cb Callback function to add. Must not be NULL. | |
1256 | * @param cb_data Data for the callback function. Can be NULL. | |
1257 | * | |
1258 | * @retval SR_OK Success. | |
1259 | * @retval SR_ERR_ARG Invalid argument. | |
1260 | * | |
1261 | * @since 0.3.0 | |
1262 | * @private | |
1263 | */ | |
1264 | SR_PRIV int sr_session_source_add(struct sr_session *session, int fd, | |
1265 | int events, int timeout, sr_receive_data_callback cb, void *cb_data) | |
1266 | { | |
1267 | if (fd < 0 && timeout < 0) { | |
1268 | sr_err("Cannot create timer source without timeout."); | |
1269 | return SR_ERR_ARG; | |
1270 | } | |
1271 | return sr_session_fd_source_add(session, GINT_TO_POINTER(fd), | |
1272 | fd, events, timeout, cb, cb_data); | |
1273 | } | |
1274 | ||
1275 | /** | |
1276 | * Add an event source for a GPollFD. | |
1277 | * | |
1278 | * @param session The session to use. Must not be NULL. | |
1279 | * @param pollfd The GPollFD. Must not be NULL. | |
1280 | * @param timeout Max time in ms to wait before the callback is called, | |
1281 | * or -1 to wait indefinitely. | |
1282 | * @param cb Callback function to add. Must not be NULL. | |
1283 | * @param cb_data Data for the callback function. Can be NULL. | |
1284 | * | |
1285 | * @retval SR_OK Success. | |
1286 | * @retval SR_ERR_ARG Invalid argument. | |
1287 | * | |
1288 | * @since 0.3.0 | |
1289 | * @private | |
1290 | */ | |
1291 | SR_PRIV int sr_session_source_add_pollfd(struct sr_session *session, | |
1292 | GPollFD *pollfd, int timeout, sr_receive_data_callback cb, | |
1293 | void *cb_data) | |
1294 | { | |
1295 | if (!pollfd) { | |
1296 | sr_err("%s: pollfd was NULL", __func__); | |
1297 | return SR_ERR_ARG; | |
1298 | } | |
1299 | return sr_session_fd_source_add(session, pollfd, pollfd->fd, | |
1300 | pollfd->events, timeout, cb, cb_data); | |
1301 | } | |
1302 | ||
1303 | /** | |
1304 | * Add an event source for a GIOChannel. | |
1305 | * | |
1306 | * @param session The session to use. Must not be NULL. | |
1307 | * @param channel The GIOChannel. | |
1308 | * @param events Events to poll on. | |
1309 | * @param timeout Max time in ms to wait before the callback is called, | |
1310 | * or -1 to wait indefinitely. | |
1311 | * @param cb Callback function to add. Must not be NULL. | |
1312 | * @param cb_data Data for the callback function. Can be NULL. | |
1313 | * | |
1314 | * @retval SR_OK Success. | |
1315 | * @retval SR_ERR_ARG Invalid argument. | |
1316 | * | |
1317 | * @since 0.3.0 | |
1318 | * @private | |
1319 | */ | |
1320 | SR_PRIV int sr_session_source_add_channel(struct sr_session *session, | |
1321 | GIOChannel *channel, int events, int timeout, | |
1322 | sr_receive_data_callback cb, void *cb_data) | |
1323 | { | |
1324 | GPollFD pollfd; | |
1325 | ||
1326 | if (!channel) { | |
1327 | sr_err("%s: channel was NULL", __func__); | |
1328 | return SR_ERR_ARG; | |
1329 | } | |
1330 | /* We should be using g_io_create_watch(), but can't without | |
1331 | * changing the driver API, as the callback signature is different. | |
1332 | */ | |
1333 | #ifdef _WIN32 | |
1334 | g_io_channel_win32_make_pollfd(channel, events, &pollfd); | |
1335 | #else | |
1336 | pollfd.fd = g_io_channel_unix_get_fd(channel); | |
1337 | pollfd.events = events; | |
1338 | #endif | |
1339 | return sr_session_fd_source_add(session, channel, pollfd.fd, | |
1340 | pollfd.events, timeout, cb, cb_data); | |
1341 | } | |
1342 | ||
1343 | /** | |
1344 | * Remove the source identified by the specified poll object. | |
1345 | * | |
1346 | * @param session The session to use. Must not be NULL. | |
1347 | * @param key The key by which the source is identified. | |
1348 | * | |
1349 | * @retval SR_OK Success | |
1350 | * @retval SR_ERR_BUG No event source for poll_object found. | |
1351 | * | |
1352 | * @private | |
1353 | */ | |
1354 | SR_PRIV int sr_session_source_remove_internal(struct sr_session *session, | |
1355 | void *key) | |
1356 | { | |
1357 | GSource *source; | |
1358 | ||
1359 | source = g_hash_table_lookup(session->event_sources, key); | |
1360 | /* | |
1361 | * Trying to remove an already removed event source is problematic | |
1362 | * since the poll_object handle may have been reused in the meantime. | |
1363 | */ | |
1364 | if (!source) { | |
1365 | sr_warn("Cannot remove non-existing event source %p.", key); | |
1366 | return SR_ERR_BUG; | |
1367 | } | |
1368 | g_source_destroy(source); | |
1369 | ||
1370 | return SR_OK; | |
1371 | } | |
1372 | ||
1373 | /** | |
1374 | * Remove the source belonging to the specified file descriptor. | |
1375 | * | |
1376 | * @param session The session to use. Must not be NULL. | |
1377 | * @param fd The file descriptor for which the source should be removed. | |
1378 | * | |
1379 | * @retval SR_OK Success | |
1380 | * @retval SR_ERR_ARG Invalid argument | |
1381 | * @retval SR_ERR_BUG Internal error. | |
1382 | * | |
1383 | * @since 0.3.0 | |
1384 | * @private | |
1385 | */ | |
1386 | SR_PRIV int sr_session_source_remove(struct sr_session *session, int fd) | |
1387 | { | |
1388 | return sr_session_source_remove_internal(session, GINT_TO_POINTER(fd)); | |
1389 | } | |
1390 | ||
1391 | /** | |
1392 | * Remove the source belonging to the specified poll descriptor. | |
1393 | * | |
1394 | * @param session The session to use. Must not be NULL. | |
1395 | * @param pollfd The poll descriptor for which the source should be removed. | |
1396 | * Must not be NULL. | |
1397 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or | |
1398 | * SR_ERR_MALLOC upon memory allocation errors, SR_ERR_BUG upon | |
1399 | * internal errors. | |
1400 | * | |
1401 | * @since 0.2.0 | |
1402 | * @private | |
1403 | */ | |
1404 | SR_PRIV int sr_session_source_remove_pollfd(struct sr_session *session, | |
1405 | GPollFD *pollfd) | |
1406 | { | |
1407 | if (!pollfd) { | |
1408 | sr_err("%s: pollfd was NULL", __func__); | |
1409 | return SR_ERR_ARG; | |
1410 | } | |
1411 | return sr_session_source_remove_internal(session, pollfd); | |
1412 | } | |
1413 | ||
1414 | /** | |
1415 | * Remove the source belonging to the specified channel. | |
1416 | * | |
1417 | * @param session The session to use. Must not be NULL. | |
1418 | * @param channel The channel for which the source should be removed. | |
1419 | * Must not be NULL. | |
1420 | * @retval SR_OK Success. | |
1421 | * @retval SR_ERR_ARG Invalid argument. | |
1422 | * @return SR_ERR_BUG Internal error. | |
1423 | * | |
1424 | * @since 0.2.0 | |
1425 | * @private | |
1426 | */ | |
1427 | SR_PRIV int sr_session_source_remove_channel(struct sr_session *session, | |
1428 | GIOChannel *channel) | |
1429 | { | |
1430 | if (!channel) { | |
1431 | sr_err("%s: channel was NULL", __func__); | |
1432 | return SR_ERR_ARG; | |
1433 | } | |
1434 | return sr_session_source_remove_internal(session, channel); | |
1435 | } | |
1436 | ||
1437 | /** Unregister an event source that has been destroyed. | |
1438 | * | |
1439 | * This is intended to be called from a source's finalize() method. | |
1440 | * | |
1441 | * @param session The session to use. Must not be NULL. | |
1442 | * @param key The key used to identify @a source. | |
1443 | * @param source The source object that was destroyed. | |
1444 | * | |
1445 | * @retval SR_OK Success. | |
1446 | * @retval SR_ERR_BUG Event source for @a key does not match @a source. | |
1447 | * @retval SR_ERR Other error. | |
1448 | * | |
1449 | * @private | |
1450 | */ | |
1451 | SR_PRIV int sr_session_source_destroyed(struct sr_session *session, | |
1452 | void *key, GSource *source) | |
1453 | { | |
1454 | GSource *registered_source; | |
1455 | ||
1456 | registered_source = g_hash_table_lookup(session->event_sources, key); | |
1457 | /* | |
1458 | * Trying to remove an already removed event source is problematic | |
1459 | * since the poll_object handle may have been reused in the meantime. | |
1460 | */ | |
1461 | if (!registered_source) { | |
1462 | sr_err("No event source for key %p found.", key); | |
1463 | return SR_ERR_BUG; | |
1464 | } | |
1465 | if (registered_source != source) { | |
1466 | sr_err("Event source for key %p does not match" | |
1467 | " destroyed source.", key); | |
1468 | return SR_ERR_BUG; | |
1469 | } | |
1470 | g_hash_table_remove(session->event_sources, key); | |
1471 | ||
1472 | if (g_hash_table_size(session->event_sources) > 0) | |
1473 | return SR_OK; | |
1474 | ||
1475 | /* If no event sources are left, consider the acquisition finished. | |
1476 | * This is pretty crude, as it requires all event sources to be | |
1477 | * registered via the libsigrok API. | |
1478 | */ | |
1479 | return stop_check_later(session); | |
1480 | } | |
1481 | ||
1482 | static void copy_src(struct sr_config *src, struct sr_datafeed_meta *meta_copy) | |
1483 | { | |
1484 | g_variant_ref(src->data); | |
1485 | meta_copy->config = g_slist_append(meta_copy->config, | |
1486 | g_memdup(src, sizeof(struct sr_config))); | |
1487 | } | |
1488 | ||
1489 | SR_API int sr_packet_copy(const struct sr_datafeed_packet *packet, | |
1490 | struct sr_datafeed_packet **copy) | |
1491 | { | |
1492 | const struct sr_datafeed_meta *meta; | |
1493 | struct sr_datafeed_meta *meta_copy; | |
1494 | const struct sr_datafeed_logic *logic; | |
1495 | struct sr_datafeed_logic *logic_copy; | |
1496 | const struct sr_datafeed_analog *analog; | |
1497 | struct sr_datafeed_analog *analog_copy; | |
1498 | uint8_t *payload; | |
1499 | ||
1500 | *copy = g_malloc0(sizeof(struct sr_datafeed_packet)); | |
1501 | (*copy)->type = packet->type; | |
1502 | ||
1503 | switch (packet->type) { | |
1504 | case SR_DF_TRIGGER: | |
1505 | case SR_DF_END: | |
1506 | /* No payload. */ | |
1507 | break; | |
1508 | case SR_DF_HEADER: | |
1509 | payload = g_malloc(sizeof(struct sr_datafeed_header)); | |
1510 | memcpy(payload, packet->payload, sizeof(struct sr_datafeed_header)); | |
1511 | (*copy)->payload = payload; | |
1512 | break; | |
1513 | case SR_DF_META: | |
1514 | meta = packet->payload; | |
1515 | meta_copy = g_malloc0(sizeof(struct sr_datafeed_meta)); | |
1516 | g_slist_foreach(meta->config, (GFunc)copy_src, meta_copy->config); | |
1517 | (*copy)->payload = meta_copy; | |
1518 | break; | |
1519 | case SR_DF_LOGIC: | |
1520 | logic = packet->payload; | |
1521 | logic_copy = g_malloc(sizeof(*logic_copy)); | |
1522 | if (!logic_copy) | |
1523 | return SR_ERR; | |
1524 | logic_copy->length = logic->length; | |
1525 | logic_copy->unitsize = logic->unitsize; | |
1526 | logic_copy->data = g_malloc(logic->length * logic->unitsize); | |
1527 | if (!logic_copy->data) { | |
1528 | g_free(logic_copy); | |
1529 | return SR_ERR; | |
1530 | } | |
1531 | memcpy(logic_copy->data, logic->data, logic->length * logic->unitsize); | |
1532 | (*copy)->payload = logic_copy; | |
1533 | break; | |
1534 | case SR_DF_ANALOG: | |
1535 | analog = packet->payload; | |
1536 | analog_copy = g_malloc(sizeof(*analog_copy)); | |
1537 | analog_copy->data = g_malloc( | |
1538 | analog->encoding->unitsize * analog->num_samples); | |
1539 | memcpy(analog_copy->data, analog->data, | |
1540 | analog->encoding->unitsize * analog->num_samples); | |
1541 | analog_copy->num_samples = analog->num_samples; | |
1542 | analog_copy->encoding = g_memdup(analog->encoding, | |
1543 | sizeof(struct sr_analog_encoding)); | |
1544 | analog_copy->meaning = g_memdup(analog->meaning, | |
1545 | sizeof(struct sr_analog_meaning)); | |
1546 | analog_copy->meaning->channels = g_slist_copy( | |
1547 | analog->meaning->channels); | |
1548 | analog_copy->spec = g_memdup(analog->spec, | |
1549 | sizeof(struct sr_analog_spec)); | |
1550 | (*copy)->payload = analog_copy; | |
1551 | break; | |
1552 | default: | |
1553 | sr_err("Unknown packet type %d", packet->type); | |
1554 | return SR_ERR; | |
1555 | } | |
1556 | ||
1557 | return SR_OK; | |
1558 | } | |
1559 | ||
1560 | SR_API void sr_packet_free(struct sr_datafeed_packet *packet) | |
1561 | { | |
1562 | const struct sr_datafeed_meta *meta; | |
1563 | const struct sr_datafeed_logic *logic; | |
1564 | const struct sr_datafeed_analog *analog; | |
1565 | struct sr_config *src; | |
1566 | GSList *l; | |
1567 | ||
1568 | switch (packet->type) { | |
1569 | case SR_DF_TRIGGER: | |
1570 | case SR_DF_END: | |
1571 | /* No payload. */ | |
1572 | break; | |
1573 | case SR_DF_HEADER: | |
1574 | /* Payload is a simple struct. */ | |
1575 | g_free((void *)packet->payload); | |
1576 | break; | |
1577 | case SR_DF_META: | |
1578 | meta = packet->payload; | |
1579 | for (l = meta->config; l; l = l->next) { | |
1580 | src = l->data; | |
1581 | g_variant_unref(src->data); | |
1582 | g_free(src); | |
1583 | } | |
1584 | g_slist_free(meta->config); | |
1585 | g_free((void *)packet->payload); | |
1586 | break; | |
1587 | case SR_DF_LOGIC: | |
1588 | logic = packet->payload; | |
1589 | g_free(logic->data); | |
1590 | g_free((void *)packet->payload); | |
1591 | break; | |
1592 | case SR_DF_ANALOG: | |
1593 | analog = packet->payload; | |
1594 | g_free(analog->data); | |
1595 | g_free(analog->encoding); | |
1596 | g_slist_free(analog->meaning->channels); | |
1597 | g_free(analog->meaning); | |
1598 | g_free(analog->spec); | |
1599 | g_free((void *)packet->payload); | |
1600 | break; | |
1601 | default: | |
1602 | sr_err("Unknown packet type %d", packet->type); | |
1603 | } | |
1604 | g_free(packet); | |
1605 | } | |
1606 | ||
1607 | /** @} */ |