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