2 * This file is part of the libsigrok project.
4 * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
5 * Copyright (C) 2015 Daniel Elstner <daniel.kitta@gmail.com>
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.
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.
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/>.
28 #include <libsigrok/libsigrok.h>
29 #include "libsigrok-internal.h"
32 #define LOG_PREFIX "session"
38 * Creating, using, or destroying libsigrok sessions.
42 * @defgroup grp_session Session handling
44 * Creating, using, or destroying libsigrok sessions.
49 struct datafeed_callback {
50 sr_datafeed_callback cb;
54 /** Custom GLib event source for generic descriptor I/O.
55 * @see https://developer.gnome.org/glib/stable/glib-The-Main-Event-Loop.html
64 /* Meta-data needed to keep track of installed sources */
65 struct sr_session *session;
71 /** FD event source prepare() method.
72 * This is called immediately before poll().
74 static gboolean fd_source_prepare(GSource *source, int *timeout)
77 struct fd_source *fsource;
80 fsource = (struct fd_source *)source;
82 if (fsource->timeout_us >= 0) {
83 now_us = g_source_get_time(source);
85 if (fsource->due_us == 0) {
86 /* First-time initialization of the expiration time */
87 fsource->due_us = now_us + fsource->timeout_us;
89 remaining_ms = (MAX(0, fsource->due_us - now_us) + 999) / 1000;
93 *timeout = remaining_ms;
95 return (remaining_ms == 0);
98 /** FD event source check() method.
99 * This is called after poll() returns to check whether an event fired.
101 static gboolean fd_source_check(GSource *source)
103 struct fd_source *fsource;
104 unsigned int revents;
106 fsource = (struct fd_source *)source;
107 revents = fsource->pollfd.revents;
109 return (revents != 0 || (fsource->timeout_us >= 0
110 && fsource->due_us <= g_source_get_time(source)));
113 /** FD event source dispatch() method.
114 * This is called if either prepare() or check() returned TRUE.
116 static gboolean fd_source_dispatch(GSource *source,
117 GSourceFunc callback, void *user_data)
119 struct fd_source *fsource;
120 unsigned int revents;
123 fsource = (struct fd_source *)source;
124 revents = fsource->pollfd.revents;
127 sr_err("Callback not set, cannot dispatch event.");
128 return G_SOURCE_REMOVE;
130 keep = (*(sr_receive_data_callback)callback)
131 (fsource->pollfd.fd, revents, user_data);
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;
140 /** FD event source finalize() method.
142 static void fd_source_finalize(GSource *source)
144 struct fd_source *fsource;
146 fsource = (struct fd_source *)source;
148 sr_dbg("%s: key %p", __func__, fsource->key);
150 sr_session_source_destroyed(fsource->session, fsource->key, source);
153 /** Create an event source for I/O on a file descriptor.
155 * In order to maintain API compatibility, this event source also doubles
156 * as a timer event source.
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.
164 static GSource *fd_source_new(struct sr_session *session, void *key,
165 gintptr fd, int events, int timeout_ms)
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
174 struct fd_source *fsource;
176 source = g_source_new(&fd_source_funcs, sizeof(struct fd_source));
177 fsource = (struct fd_source *)source;
179 g_source_set_name(source, (fd < 0) ? "timer" : "fd");
181 if (timeout_ms >= 0) {
182 fsource->timeout_us = 1000 * (int64_t)timeout_ms;
185 fsource->timeout_us = -1;
186 fsource->due_us = INT64_MAX;
188 fsource->session = session;
191 fsource->pollfd.fd = fd;
192 fsource->pollfd.events = events;
193 fsource->pollfd.revents = 0;
196 g_source_add_poll(source, &fsource->pollfd);
202 * Create a new session.
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.
209 * @retval SR_OK Success.
210 * @retval SR_ERR_ARG Invalid argument.
214 SR_API int sr_session_new(struct sr_context *ctx,
215 struct sr_session **new_session)
217 struct sr_session *session;
222 session = g_malloc0(sizeof(struct sr_session));
226 g_mutex_init(&session->main_mutex);
228 /* To maintain API compatibility, we need a lookup table
229 * which maps poll_object IDs to GSource* pointers.
231 session->event_sources = g_hash_table_new(NULL, NULL);
233 *new_session = session;
240 * This frees up all memory used by the session.
242 * @param session The session to destroy. Must not be NULL.
244 * @retval SR_OK Success.
245 * @retval SR_ERR_ARG Invalid session passed.
249 SR_API int sr_session_destroy(struct sr_session *session)
252 sr_err("%s: session was NULL", __func__);
256 sr_session_dev_remove_all(session);
257 g_slist_free_full(session->owned_devs, (GDestroyNotify)sr_dev_inst_free);
259 sr_session_datafeed_callback_remove_all(session);
261 g_hash_table_unref(session->event_sources);
263 g_mutex_clear(&session->main_mutex);
271 * Remove all the devices from a session.
273 * The session itself (i.e., the struct sr_session) is not free'd and still
274 * exists after this function returns.
276 * @param session The session to use. Must not be NULL.
278 * @retval SR_OK Success.
279 * @retval SR_ERR_BUG Invalid session passed.
283 SR_API int sr_session_dev_remove_all(struct sr_session *session)
285 struct sr_dev_inst *sdi;
289 sr_err("%s: session was NULL", __func__);
293 for (l = session->devs; l; l = l->next) {
294 sdi = (struct sr_dev_inst *) l->data;
298 g_slist_free(session->devs);
299 session->devs = NULL;
305 * Add a device instance to a session.
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
312 * @retval SR_OK Success.
313 * @retval SR_ERR_ARG Invalid argument.
317 SR_API int sr_session_dev_add(struct sr_session *session,
318 struct sr_dev_inst *sdi)
323 sr_err("%s: sdi was NULL", __func__);
328 sr_err("%s: session was NULL", __func__);
332 /* If sdi->session is not NULL, the device is already in this or
333 * another session. */
335 sr_err("%s: already assigned to session", __func__);
339 /* If sdi->driver is NULL, this is a virtual device. */
341 /* Just add the device, don't run dev_open(). */
342 session->devs = g_slist_append(session->devs, sdi);
343 sdi->session = session;
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__);
353 session->devs = g_slist_append(session->devs, sdi);
354 sdi->session = session;
356 /* TODO: This is invalid if the session runs in a different thread.
357 * The usage semantics and restrictions need to be documented.
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)",
368 if ((ret = sdi->driver->dev_acquisition_start(sdi,
370 sr_err("Failed to start acquisition of device in "
371 "running session (%s)", sr_strerror(ret));
380 * List all device instances attached to a session.
382 * @param session The session to use. Must not be NULL.
383 * @param devlist A pointer where the device instance list will be
384 * stored on return. If no devices are in the session,
385 * this will be NULL. Each element in the list points
386 * to a struct sr_dev_inst *.
387 * The list must be freed by the caller, but not the
388 * elements pointed to.
390 * @retval SR_OK Success.
391 * @retval SR_ERR_ARG Invalid argument.
395 SR_API int sr_session_dev_list(struct sr_session *session, GSList **devlist)
403 *devlist = g_slist_copy(session->devs);
409 * Remove a device instance from a session.
411 * @param session The session to remove from. Must not be NULL.
412 * @param sdi The device instance to remove from a session. Must not
413 * be NULL. Also, sdi->driver and sdi->driver->dev_open must
416 * @retval SR_OK Success.
417 * @retval SR_ERR_ARG Invalid argument.
421 SR_API int sr_session_dev_remove(struct sr_session *session,
422 struct sr_dev_inst *sdi)
425 sr_err("%s: sdi was NULL", __func__);
430 sr_err("%s: session was NULL", __func__);
434 /* If sdi->session is not session, the device is not in this
436 if (sdi->session != session) {
437 sr_err("%s: not assigned to this session", __func__);
441 session->devs = g_slist_remove(session->devs, sdi);
448 * Remove all datafeed callbacks in a session.
450 * @param session The session to use. Must not be NULL.
452 * @retval SR_OK Success.
453 * @retval SR_ERR_ARG Invalid session passed.
457 SR_API int sr_session_datafeed_callback_remove_all(struct sr_session *session)
460 sr_err("%s: session was NULL", __func__);
464 g_slist_free_full(session->datafeed_callbacks, g_free);
465 session->datafeed_callbacks = NULL;
471 * Add a datafeed callback to a session.
473 * @param session The session to use. Must not be NULL.
474 * @param cb Function to call when a chunk of data is received.
476 * @param cb_data Opaque pointer passed in by the caller.
478 * @retval SR_OK Success.
479 * @retval SR_ERR_BUG No session exists.
483 SR_API int sr_session_datafeed_callback_add(struct sr_session *session,
484 sr_datafeed_callback cb, void *cb_data)
486 struct datafeed_callback *cb_struct;
489 sr_err("%s: session was NULL", __func__);
494 sr_err("%s: cb was NULL", __func__);
498 cb_struct = g_malloc0(sizeof(struct datafeed_callback));
500 cb_struct->cb_data = cb_data;
502 session->datafeed_callbacks =
503 g_slist_append(session->datafeed_callbacks, cb_struct);
509 * Get the trigger assigned to this session.
511 * @param session The session to use.
513 * @retval NULL Invalid (NULL) session was passed to the function.
514 * @retval other The trigger assigned to this session (can be NULL).
518 SR_API struct sr_trigger *sr_session_trigger_get(struct sr_session *session)
523 return session->trigger;
527 * Set the trigger of this session.
529 * @param session The session to use. Must not be NULL.
530 * @param trig The trigger to assign to this session. Can be NULL.
532 * @retval SR_OK Success.
533 * @retval SR_ERR_ARG Invalid argument.
537 SR_API int sr_session_trigger_set(struct sr_session *session, struct sr_trigger *trig)
542 session->trigger = trig;
547 static int verify_trigger(struct sr_trigger *trigger)
549 struct sr_trigger_stage *stage;
550 struct sr_trigger_match *match;
553 if (!trigger->stages) {
554 sr_err("No trigger stages defined.");
558 sr_spew("Checking trigger:");
559 for (l = trigger->stages; l; l = l->next) {
561 if (!stage->matches) {
562 sr_err("Stage %d has no matches defined.", stage->stage);
565 for (m = stage->matches; m; m = m->next) {
567 if (!match->channel) {
568 sr_err("Stage %d match has no channel.", stage->stage);
572 sr_err("Stage %d match is not defined.", stage->stage);
575 sr_spew("Stage %d match on channel %s, match %d", stage->stage,
576 match->channel->name, match->match);
583 /** Set up the main context the session will be executing in.
585 * Must be called just before the session starts, by the thread which
586 * will execute the session main loop. Once acquired, the main context
587 * pointer is immutable for the duration of the session run.
589 static int set_main_context(struct sr_session *session)
591 GMainContext *main_context;
593 g_mutex_lock(&session->main_mutex);
595 /* May happen if sr_session_start() is called a second time
596 * while the session is still running.
598 if (session->main_context) {
599 sr_err("Main context already set.");
601 g_mutex_unlock(&session->main_mutex);
604 main_context = g_main_context_ref_thread_default();
606 * Try to use an existing main context if possible, but only if we
607 * can make it owned by the current thread. Otherwise, create our
608 * own main context so that event source callbacks can execute in
609 * the session thread.
611 if (g_main_context_acquire(main_context)) {
612 g_main_context_release(main_context);
614 sr_dbg("Using thread-default main context.");
616 g_main_context_unref(main_context);
618 sr_dbg("Creating our own main context.");
619 main_context = g_main_context_new();
621 session->main_context = main_context;
623 g_mutex_unlock(&session->main_mutex);
628 /** Unset the main context used for the current session run.
630 * Must be called right after stopping the session. Note that if the
631 * session is stopped asynchronously, the main loop may still be running
632 * after the main context has been unset. This is OK as long as no new
633 * event sources are created -- the main loop holds its own reference
634 * to the main context.
636 static int unset_main_context(struct sr_session *session)
640 g_mutex_lock(&session->main_mutex);
642 if (session->main_context) {
643 g_main_context_unref(session->main_context);
644 session->main_context = NULL;
647 /* May happen if the set/unset calls are not matched.
649 sr_err("No main context to unset.");
652 g_mutex_unlock(&session->main_mutex);
657 static unsigned int session_source_attach(struct sr_session *session,
662 g_mutex_lock(&session->main_mutex);
664 if (session->main_context)
665 id = g_source_attach(source, session->main_context);
667 sr_err("Cannot add event source without main context.");
669 g_mutex_unlock(&session->main_mutex);
674 /* Idle handler; invoked when the number of registered event sources
675 * for a running session drops to zero.
677 static gboolean delayed_stop_check(void *data)
679 struct sr_session *session;
682 session->stop_check_id = 0;
684 /* Session already ended? */
685 if (!session->running)
686 return G_SOURCE_REMOVE;
688 /* New event sources may have been installed in the meantime. */
689 if (g_hash_table_size(session->event_sources) != 0)
690 return G_SOURCE_REMOVE;
692 session->running = FALSE;
693 unset_main_context(session);
697 /* This indicates a bug in user code, since it is not valid to
698 * restart or destroy a session while it may still be running.
700 if (!session->main_loop && !session->stopped_callback) {
701 sr_err("BUG: Session stop left unhandled.");
702 return G_SOURCE_REMOVE;
704 if (session->main_loop)
705 g_main_loop_quit(session->main_loop);
707 if (session->stopped_callback)
708 (*session->stopped_callback)(session->stopped_cb_data);
710 return G_SOURCE_REMOVE;
713 static int stop_check_later(struct sr_session *session)
716 unsigned int source_id;
718 if (session->stop_check_id != 0)
719 return SR_OK; /* idle handler already installed */
721 source = g_idle_source_new();
722 g_source_set_callback(source, &delayed_stop_check, session, NULL);
724 source_id = session_source_attach(session, source);
725 session->stop_check_id = source_id;
727 g_source_unref(source);
729 return (source_id != 0) ? SR_OK : SR_ERR;
735 * When this function returns with a status code indicating success, the
736 * session is running. Use sr_session_stopped_callback_set() to receive
737 * notification upon completion, or call sr_session_run() to block until
740 * Session events will be processed in the context of the current thread.
741 * If a thread-default GLib main context has been set, and is not owned by
742 * any other thread, it will be used. Otherwise, libsigrok will create its
743 * own main context for the current thread.
745 * @param session The session to use. Must not be NULL.
747 * @retval SR_OK Success.
748 * @retval SR_ERR_ARG Invalid session passed.
749 * @retval SR_ERR Other error.
753 SR_API int sr_session_start(struct sr_session *session)
755 struct sr_dev_inst *sdi;
756 struct sr_channel *ch;
757 GSList *l, *c, *lend;
761 sr_err("%s: session was NULL", __func__);
765 if (!session->devs) {
766 sr_err("%s: session->devs was NULL; a session "
767 "cannot be started without devices.", __func__);
771 if (session->running) {
772 sr_err("Cannot (re-)start session while it is still running.");
776 if (session->trigger) {
777 ret = verify_trigger(session->trigger);
782 /* Check enabled channels and commit settings of all devices. */
783 for (l = session->devs; l; l = l->next) {
785 for (c = sdi->channels; c; c = c->next) {
791 sr_err("%s device %s has no enabled channels.",
792 sdi->driver->name, sdi->connection_id);
796 ret = sr_config_commit(sdi);
798 sr_err("Failed to commit %s device %s settings "
799 "before starting acquisition.",
800 sdi->driver->name, sdi->connection_id);
805 ret = set_main_context(session);
809 sr_info("Starting.");
811 session->running = TRUE;
813 /* Have all devices start acquisition. */
814 for (l = session->devs; l; l = l->next) {
816 ret = sdi->driver->dev_acquisition_start(sdi, sdi);
818 sr_err("Could not start %s device %s acquisition.",
819 sdi->driver->name, sdi->connection_id);
825 /* If there are multiple devices, some of them may already have
826 * started successfully. Stop them now before returning. */
828 for (l = session->devs; l != lend; l = l->next) {
830 if (sdi->driver->dev_acquisition_stop)
831 sdi->driver->dev_acquisition_stop(sdi, sdi);
833 /* TODO: Handle delayed stops. Need to iterate the event
835 session->running = FALSE;
837 unset_main_context(session);
841 if (g_hash_table_size(session->event_sources) == 0)
842 stop_check_later(session);
848 * Block until the running session stops.
850 * This is a convenience function which creates a GLib main loop and runs
851 * it to process session events until the session stops.
853 * Instead of using this function, applications may run their own GLib main
854 * loop, and use sr_session_stopped_callback_set() to receive notification
855 * when the session finished running.
857 * @param session The session to use. Must not be NULL.
859 * @retval SR_OK Success.
860 * @retval SR_ERR_ARG Invalid session passed.
861 * @retval SR_ERR Other error.
865 SR_API int sr_session_run(struct sr_session *session)
868 sr_err("%s: session was NULL", __func__);
871 if (!session->running) {
872 sr_err("No session running.");
875 if (session->main_loop) {
876 sr_err("Main loop already created.");
880 g_mutex_lock(&session->main_mutex);
882 if (!session->main_context) {
883 sr_err("Cannot run without main context.");
884 g_mutex_unlock(&session->main_mutex);
887 session->main_loop = g_main_loop_new(session->main_context, FALSE);
889 g_mutex_unlock(&session->main_mutex);
891 g_main_loop_run(session->main_loop);
893 g_main_loop_unref(session->main_loop);
894 session->main_loop = NULL;
899 static gboolean session_stop_sync(void *user_data)
901 struct sr_session *session;
902 struct sr_dev_inst *sdi;
907 if (!session->running)
908 return G_SOURCE_REMOVE;
910 sr_info("Stopping.");
912 for (node = session->devs; node; node = node->next) {
914 if (sdi->driver && sdi->driver->dev_acquisition_stop)
915 sdi->driver->dev_acquisition_stop(sdi, sdi);
918 return G_SOURCE_REMOVE;
924 * This requests the drivers of each device participating in the session to
925 * abort the acquisition as soon as possible. Even after this function returns,
926 * event processing still continues until all devices have actually stopped.
928 * Use sr_session_stopped_callback_set() to receive notification when the event
929 * processing finished.
931 * This function is reentrant. That is, it may be called from a different
932 * thread than the one executing the session, as long as it can be ensured
933 * that the session object is valid.
935 * If the session is not running, sr_session_stop() silently does nothing.
937 * @param session The session to use. Must not be NULL.
939 * @retval SR_OK Success.
940 * @retval SR_ERR_ARG Invalid session passed.
944 SR_API int sr_session_stop(struct sr_session *session)
946 GMainContext *main_context;
949 sr_err("%s: session was NULL", __func__);
953 g_mutex_lock(&session->main_mutex);
955 main_context = (session->main_context)
956 ? g_main_context_ref(session->main_context)
959 g_mutex_unlock(&session->main_mutex);
962 sr_dbg("No main context set; already stopped?");
963 /* Not an error; as it would be racy. */
966 g_main_context_invoke(main_context, &session_stop_sync, session);
967 g_main_context_unref(main_context);
973 * Return whether the session is currently running.
975 * Note that this function should be called from the same thread
976 * the session was started in.
978 * @param session The session to use. Must not be NULL.
980 * @retval TRUE Session is running.
981 * @retval FALSE Session is not running.
982 * @retval SR_ERR_ARG Invalid session passed.
986 SR_API int sr_session_is_running(struct sr_session *session)
989 sr_err("%s: session was NULL", __func__);
992 return session->running;
996 * Set the callback to be invoked after a session stopped running.
998 * Install a callback to receive notification when a session run stopped.
999 * This can be used to integrate session execution with an existing main
1000 * loop, without having to block in sr_session_run().
1002 * Note that the callback will be invoked in the context of the thread
1003 * that calls sr_session_start().
1005 * @param session The session to use. Must not be NULL.
1006 * @param cb The callback to invoke on session stop. May be NULL to unset.
1007 * @param cb_data User data pointer to be passed to the callback.
1009 * @retval SR_OK Success.
1010 * @retval SR_ERR_ARG Invalid session passed.
1014 SR_API int sr_session_stopped_callback_set(struct sr_session *session,
1015 sr_session_stopped_callback cb, void *cb_data)
1018 sr_err("%s: session was NULL", __func__);
1021 session->stopped_callback = cb;
1022 session->stopped_cb_data = cb_data;
1030 * @param packet The packet to show debugging information for.
1032 static void datafeed_dump(const struct sr_datafeed_packet *packet)
1034 const struct sr_datafeed_logic *logic;
1035 const struct sr_datafeed_analog_old *analog_old;
1036 const struct sr_datafeed_analog *analog;
1038 /* Please use the same order as in libsigrok.h. */
1039 switch (packet->type) {
1041 sr_dbg("bus: Received SR_DF_HEADER packet.");
1044 sr_dbg("bus: Received SR_DF_END packet.");
1047 sr_dbg("bus: Received SR_DF_META packet.");
1050 sr_dbg("bus: Received SR_DF_TRIGGER packet.");
1053 logic = packet->payload;
1054 sr_dbg("bus: Received SR_DF_LOGIC packet (%" PRIu64 " bytes, "
1055 "unitsize = %d).", logic->length, logic->unitsize);
1057 case SR_DF_ANALOG_OLD:
1058 analog_old = packet->payload;
1059 sr_dbg("bus: Received SR_DF_ANALOG_OLD packet (%d samples).",
1060 analog_old->num_samples);
1062 case SR_DF_FRAME_BEGIN:
1063 sr_dbg("bus: Received SR_DF_FRAME_BEGIN packet.");
1065 case SR_DF_FRAME_END:
1066 sr_dbg("bus: Received SR_DF_FRAME_END packet.");
1069 analog = packet->payload;
1070 sr_dbg("bus: Received SR_DF_ANALOG packet (%d samples).",
1071 analog->num_samples);
1074 sr_dbg("bus: Received unknown packet type: %d.", packet->type);
1080 * Send a packet to whatever is listening on the datafeed bus.
1082 * Hardware drivers use this to send a data packet to the frontend.
1085 * @param packet The datafeed packet to send to the session bus.
1087 * @retval SR_OK Success.
1088 * @retval SR_ERR_ARG Invalid argument.
1092 SR_PRIV int sr_session_send(const struct sr_dev_inst *sdi,
1093 const struct sr_datafeed_packet *packet)
1096 struct datafeed_callback *cb_struct;
1097 struct sr_datafeed_packet *packet_in, *packet_out;
1098 struct sr_transform *t;
1102 sr_err("%s: sdi was NULL", __func__);
1107 sr_err("%s: packet was NULL", __func__);
1111 if (!sdi->session) {
1112 sr_err("%s: session was NULL", __func__);
1116 if (packet->type == SR_DF_ANALOG_OLD) {
1117 /* Convert to SR_DF_ANALOG. */
1118 const struct sr_datafeed_analog_old *analog_old = packet->payload;
1119 struct sr_analog_encoding encoding;
1120 struct sr_analog_meaning meaning;
1121 struct sr_analog_spec spec;
1122 struct sr_datafeed_analog analog;
1123 struct sr_datafeed_packet new_packet;
1124 new_packet.type = SR_DF_ANALOG;
1125 new_packet.payload = &analog;
1126 analog.data = analog_old->data;
1127 analog.num_samples = analog_old->num_samples;
1128 analog.encoding = &encoding;
1129 analog.meaning = &meaning;
1130 analog.spec = &spec;
1131 encoding.unitsize = sizeof(float);
1132 encoding.is_signed = TRUE;
1133 encoding.is_float = TRUE;
1134 #ifdef WORDS_BIGENDIAN
1135 encoding.is_bigendian = TRUE;
1137 encoding.is_bigendian = FALSE;
1139 encoding.digits = 0;
1140 encoding.is_digits_decimal = FALSE;
1141 encoding.scale.p = 1;
1142 encoding.scale.q = 1;
1143 encoding.offset.p = 0;
1144 encoding.offset.q = 1;
1145 meaning.mq = analog_old->mq;
1146 meaning.unit = analog_old->unit;
1147 meaning.mqflags = analog_old->mqflags;
1148 meaning.channels = analog_old->channels;
1149 spec.spec_digits = 0;
1150 return sr_session_send(sdi, &new_packet);
1154 * Pass the packet to the first transform module. If that returns
1155 * another packet (instead of NULL), pass that packet to the next
1156 * transform module in the list, and so on.
1158 packet_in = (struct sr_datafeed_packet *)packet;
1159 for (l = sdi->session->transforms; l; l = l->next) {
1161 sr_spew("Running transform module '%s'.", t->module->id);
1162 ret = t->module->receive(t, packet_in, &packet_out);
1164 sr_err("Error while running transform module: %d.", ret);
1169 * If any of the transforms don't return an output
1172 sr_spew("Transform module didn't return a packet, aborting.");
1176 * Use this transform module's output packet as input
1177 * for the next transform module.
1179 packet_in = packet_out;
1185 * If the last transform did output a packet, pass it to all datafeed
1188 for (l = sdi->session->datafeed_callbacks; l; l = l->next) {
1189 if (sr_log_loglevel_get() >= SR_LOG_DBG)
1190 datafeed_dump(packet);
1191 cb_struct = l->data;
1192 cb_struct->cb(sdi, packet, cb_struct->cb_data);
1199 * Add an event source for a file descriptor.
1201 * @param session The session to use. Must not be NULL.
1202 * @param key The key which identifies the event source.
1203 * @param source An event source object. Must not be NULL.
1205 * @retval SR_OK Success.
1206 * @retval SR_ERR_ARG Invalid argument.
1207 * @retval SR_ERR_BUG Event source with @a key already installed.
1208 * @retval SR_ERR Other error.
1212 SR_PRIV int sr_session_source_add_internal(struct sr_session *session,
1213 void *key, GSource *source)
1216 * This must not ever happen, since the source has already been
1217 * created and its finalize() method will remove the key for the
1218 * already installed source. (Well it would, if we did not have
1219 * another sanity check there.)
1221 if (g_hash_table_contains(session->event_sources, key)) {
1222 sr_err("Event source with key %p already exists.", key);
1225 g_hash_table_insert(session->event_sources, key, source);
1227 if (session_source_attach(session, source) == 0)
1233 SR_PRIV int sr_session_fd_source_add(struct sr_session *session,
1234 void *key, gintptr fd, int events, int timeout,
1235 sr_receive_data_callback cb, void *cb_data)
1240 source = fd_source_new(session, key, fd, events, timeout);
1244 g_source_set_callback(source, (GSourceFunc)cb, cb_data, NULL);
1246 ret = sr_session_source_add_internal(session, key, source);
1247 g_source_unref(source);
1253 * Add an event source for a file descriptor.
1255 * @param session The session to use. Must not be NULL.
1256 * @param fd The file descriptor, or a negative value to create a timer source.
1257 * @param events Events to check for.
1258 * @param timeout Max time in ms to wait before the callback is called,
1259 * or -1 to wait indefinitely.
1260 * @param cb Callback function to add. Must not be NULL.
1261 * @param cb_data Data for the callback function. Can be NULL.
1263 * @retval SR_OK Success.
1264 * @retval SR_ERR_ARG Invalid argument.
1269 SR_PRIV int sr_session_source_add(struct sr_session *session, int fd,
1270 int events, int timeout, sr_receive_data_callback cb, void *cb_data)
1272 if (fd < 0 && timeout < 0) {
1273 sr_err("Cannot create timer source without timeout.");
1276 return sr_session_fd_source_add(session, GINT_TO_POINTER(fd),
1277 fd, events, timeout, cb, cb_data);
1281 * Add an event source for a GPollFD.
1283 * @param session The session to use. Must not be NULL.
1284 * @param pollfd The GPollFD. Must not be NULL.
1285 * @param timeout Max time in ms to wait before the callback is called,
1286 * or -1 to wait indefinitely.
1287 * @param cb Callback function to add. Must not be NULL.
1288 * @param cb_data Data for the callback function. Can be NULL.
1290 * @retval SR_OK Success.
1291 * @retval SR_ERR_ARG Invalid argument.
1296 SR_PRIV int sr_session_source_add_pollfd(struct sr_session *session,
1297 GPollFD *pollfd, int timeout, sr_receive_data_callback cb,
1301 sr_err("%s: pollfd was NULL", __func__);
1304 return sr_session_fd_source_add(session, pollfd, pollfd->fd,
1305 pollfd->events, timeout, cb, cb_data);
1309 * Add an event source for a GIOChannel.
1311 * @param session The session to use. Must not be NULL.
1312 * @param channel The GIOChannel.
1313 * @param events Events to poll on.
1314 * @param timeout Max time in ms to wait before the callback is called,
1315 * or -1 to wait indefinitely.
1316 * @param cb Callback function to add. Must not be NULL.
1317 * @param cb_data Data for the callback function. Can be NULL.
1319 * @retval SR_OK Success.
1320 * @retval SR_ERR_ARG Invalid argument.
1325 SR_PRIV int sr_session_source_add_channel(struct sr_session *session,
1326 GIOChannel *channel, int events, int timeout,
1327 sr_receive_data_callback cb, void *cb_data)
1332 sr_err("%s: channel was NULL", __func__);
1335 /* We should be using g_io_create_watch(), but can't without
1336 * changing the driver API, as the callback signature is different.
1339 g_io_channel_win32_make_pollfd(channel, events, &pollfd);
1341 pollfd.fd = g_io_channel_unix_get_fd(channel);
1342 pollfd.events = events;
1344 return sr_session_fd_source_add(session, channel, pollfd.fd,
1345 pollfd.events, timeout, cb, cb_data);
1349 * Remove the source identified by the specified poll object.
1351 * @param session The session to use. Must not be NULL.
1352 * @param key The key by which the source is identified.
1354 * @retval SR_OK Success
1355 * @retval SR_ERR_BUG No event source for poll_object found.
1359 SR_PRIV int sr_session_source_remove_internal(struct sr_session *session,
1364 source = g_hash_table_lookup(session->event_sources, key);
1366 * Trying to remove an already removed event source is problematic
1367 * since the poll_object handle may have been reused in the meantime.
1370 sr_warn("Cannot remove non-existing event source %p.", key);
1373 g_source_destroy(source);
1379 * Remove the source belonging to the specified file descriptor.
1381 * @param session The session to use. Must not be NULL.
1382 * @param fd The file descriptor for which the source should be removed.
1384 * @retval SR_OK Success
1385 * @retval SR_ERR_ARG Invalid argument
1386 * @retval SR_ERR_BUG Internal error.
1391 SR_PRIV int sr_session_source_remove(struct sr_session *session, int fd)
1393 return sr_session_source_remove_internal(session, GINT_TO_POINTER(fd));
1397 * Remove the source belonging to the specified poll descriptor.
1399 * @param session The session to use. Must not be NULL.
1400 * @param pollfd The poll descriptor for which the source should be removed.
1402 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or
1403 * SR_ERR_MALLOC upon memory allocation errors, SR_ERR_BUG upon
1409 SR_PRIV int sr_session_source_remove_pollfd(struct sr_session *session,
1413 sr_err("%s: pollfd was NULL", __func__);
1416 return sr_session_source_remove_internal(session, pollfd);
1420 * Remove the source belonging to the specified channel.
1422 * @param session The session to use. Must not be NULL.
1423 * @param channel The channel for which the source should be removed.
1425 * @retval SR_OK Success.
1426 * @retval SR_ERR_ARG Invalid argument.
1427 * @return SR_ERR_BUG Internal error.
1432 SR_PRIV int sr_session_source_remove_channel(struct sr_session *session,
1433 GIOChannel *channel)
1436 sr_err("%s: channel was NULL", __func__);
1439 return sr_session_source_remove_internal(session, channel);
1442 /** Unregister an event source that has been destroyed.
1444 * This is intended to be called from a source's finalize() method.
1446 * @param session The session to use. Must not be NULL.
1447 * @param key The key used to identify @a source.
1448 * @param source The source object that was destroyed.
1450 * @retval SR_OK Success.
1451 * @retval SR_ERR_BUG Event source for @a key does not match @a source.
1452 * @retval SR_ERR Other error.
1456 SR_PRIV int sr_session_source_destroyed(struct sr_session *session,
1457 void *key, GSource *source)
1459 GSource *registered_source;
1461 registered_source = g_hash_table_lookup(session->event_sources, key);
1463 * Trying to remove an already removed event source is problematic
1464 * since the poll_object handle may have been reused in the meantime.
1466 if (!registered_source) {
1467 sr_err("No event source for key %p found.", key);
1470 if (registered_source != source) {
1471 sr_err("Event source for key %p does not match"
1472 " destroyed source.", key);
1475 g_hash_table_remove(session->event_sources, key);
1477 if (g_hash_table_size(session->event_sources) > 0)
1480 /* If no event sources are left, consider the acquisition finished.
1481 * This is pretty crude, as it requires all event sources to be
1482 * registered via the libsigrok API.
1484 return stop_check_later(session);
1487 static void copy_src(struct sr_config *src, struct sr_datafeed_meta *meta_copy)
1489 g_variant_ref(src->data);
1490 meta_copy->config = g_slist_append(meta_copy->config,
1491 g_memdup(src, sizeof(struct sr_config)));
1494 SR_PRIV int sr_packet_copy(const struct sr_datafeed_packet *packet,
1495 struct sr_datafeed_packet **copy)
1497 const struct sr_datafeed_meta *meta;
1498 struct sr_datafeed_meta *meta_copy;
1499 const struct sr_datafeed_logic *logic;
1500 struct sr_datafeed_logic *logic_copy;
1501 const struct sr_datafeed_analog_old *analog_old;
1502 struct sr_datafeed_analog_old *analog_old_copy;
1503 const struct sr_datafeed_analog *analog;
1504 struct sr_datafeed_analog *analog_copy;
1507 *copy = g_malloc0(sizeof(struct sr_datafeed_packet));
1508 (*copy)->type = packet->type;
1510 switch (packet->type) {
1516 payload = g_malloc(sizeof(struct sr_datafeed_header));
1517 memcpy(payload, packet->payload, sizeof(struct sr_datafeed_header));
1518 (*copy)->payload = payload;
1521 meta = packet->payload;
1522 meta_copy = g_malloc0(sizeof(struct sr_datafeed_meta));
1523 g_slist_foreach(meta->config, (GFunc)copy_src, meta_copy->config);
1524 (*copy)->payload = meta_copy;
1527 logic = packet->payload;
1528 logic_copy = g_malloc(sizeof(*logic_copy));
1529 logic_copy->length = logic->length;
1530 logic_copy->unitsize = logic->unitsize;
1531 memcpy(logic_copy->data, logic->data, logic->length * logic->unitsize);
1532 (*copy)->payload = logic_copy;
1534 case SR_DF_ANALOG_OLD:
1535 analog_old = packet->payload;
1536 analog_old_copy = g_malloc(sizeof(*analog_old_copy));
1537 analog_old_copy->channels = g_slist_copy(analog_old->channels);
1538 analog_old_copy->num_samples = analog_old->num_samples;
1539 analog_old_copy->mq = analog_old->mq;
1540 analog_old_copy->unit = analog_old->unit;
1541 analog_old_copy->mqflags = analog_old->mqflags;
1542 analog_old_copy->data = g_malloc(analog_old->num_samples * sizeof(float));
1543 memcpy(analog_old_copy->data, analog_old->data,
1544 analog_old->num_samples * sizeof(float));
1545 (*copy)->payload = analog_old_copy;
1548 analog = packet->payload;
1549 analog_copy = g_malloc(sizeof(*analog_copy));
1550 analog_copy->data = g_malloc(
1551 analog->encoding->unitsize * analog->num_samples);
1552 memcpy(analog_copy->data, analog->data,
1553 analog->encoding->unitsize * analog->num_samples);
1554 analog_copy->num_samples = analog->num_samples;
1555 analog_copy->encoding = g_memdup(analog->encoding,
1556 sizeof(struct sr_analog_encoding));
1557 analog_copy->meaning = g_memdup(analog->meaning,
1558 sizeof(struct sr_analog_meaning));
1559 analog_copy->meaning->channels = g_slist_copy(
1560 analog->meaning->channels);
1561 analog_copy->spec = g_memdup(analog->spec,
1562 sizeof(struct sr_analog_spec));
1563 (*copy)->payload = analog_copy;
1566 sr_err("Unknown packet type %d", packet->type);
1573 void sr_packet_free(struct sr_datafeed_packet *packet)
1575 const struct sr_datafeed_meta *meta;
1576 const struct sr_datafeed_logic *logic;
1577 const struct sr_datafeed_analog_old *analog_old;
1578 const struct sr_datafeed_analog *analog;
1579 struct sr_config *src;
1582 switch (packet->type) {
1588 /* Payload is a simple struct. */
1589 g_free((void *)packet->payload);
1592 meta = packet->payload;
1593 for (l = meta->config; l; l = l->next) {
1595 g_variant_unref(src->data);
1598 g_slist_free(meta->config);
1599 g_free((void *)packet->payload);
1602 logic = packet->payload;
1603 g_free(logic->data);
1604 g_free((void *)packet->payload);
1606 case SR_DF_ANALOG_OLD:
1607 analog_old = packet->payload;
1608 g_slist_free(analog_old->channels);
1609 g_free(analog_old->data);
1610 g_free((void *)packet->payload);
1613 analog = packet->payload;
1614 g_free(analog->data);
1615 g_free(analog->encoding);
1616 g_slist_free(analog->meaning->channels);
1617 g_free(analog->meaning);
1618 g_free(analog->spec);
1619 g_free((void *)packet->payload);
1622 sr_err("Unknown packet type %d", packet->type);