+error:
+ return NULL;
+}
+
+/*
+ * get_kernel_event_by_name
+ *
+ * Find the event name for the given channel.
+ */
+struct ltt_kernel_event *get_kernel_event_by_name(
+ char *name, struct ltt_kernel_channel *channel)
+{
+ struct ltt_kernel_event *ev;
+
+ if (channel == NULL) {
+ ERR("Undefine channel");
+ goto error;
+ }
+
+ cds_list_for_each_entry(ev, &channel->events_list.head, list) {
+ if (strcmp(name, ev->event->name) == 0) {
+ DBG("Found event by name %s for channel %s", name,
+ channel->channel->name);
+ return ev;
+ }
+ }
+
+error:
+ return NULL;
+}
+
+/*
+ * trace_create_kernel_session
+ *
+ * Allocate and initialize a kernel session data structure.
+ *
+ * Return pointer to structure or NULL.
+ */
+struct ltt_kernel_session *trace_create_kernel_session(void)
+{
+ struct ltt_kernel_session *lks;
+
+ /* Allocate a new ltt kernel session */
+ lks = malloc(sizeof(struct ltt_kernel_session));
+ if (lks == NULL) {
+ perror("create kernel session malloc");
+ goto error;
+ }
+
+ /* Init data structure */
+ lks->fd = 0;
+ lks->metadata_stream_fd = 0;
+ lks->channel_count = 0;
+ lks->stream_count_global = 0;
+ lks->metadata = NULL;
+ CDS_INIT_LIST_HEAD(&lks->channel_list.head);
+
+ return lks;
+
+error:
+ return NULL;
+}
+
+/*
+ * trace_create_kernel_channel
+ *
+ * Allocate and initialize a kernel channel data structure.
+ *
+ * Return pointer to structure or NULL.
+ */
+struct ltt_kernel_channel *trace_create_kernel_channel(struct lttng_channel *chan, char *path)
+{
+ int ret;
+ struct ltt_kernel_channel *lkc;
+
+ lkc = malloc(sizeof(struct ltt_kernel_channel));
+ if (lkc == NULL) {
+ perror("ltt_kernel_channel malloc");
+ goto error;
+ }
+
+ lkc->channel = malloc(sizeof(struct lttng_channel));
+ if (lkc->channel == NULL) {
+ perror("lttng_channel malloc");
+ goto error;
+ }
+ memcpy(lkc->channel, chan, sizeof(struct lttng_channel));
+
+ lkc->fd = 0;
+ lkc->stream_count = 0;
+ lkc->enabled = 1;
+ /* Init linked list */
+ CDS_INIT_LIST_HEAD(&lkc->events_list.head);
+ CDS_INIT_LIST_HEAD(&lkc->stream_list.head);
+ /* Set default trace output path */
+ ret = asprintf(&lkc->pathname, "%s", path);
+ if (ret < 0) {
+ perror("asprintf kernel create channel");
+ goto error;
+ }
+
+ return lkc;
+
+error:
+ return NULL;
+}
+
+/*
+ * trace_create_kernel_event
+ *
+ * Allocate and initialize a kernel event. Set name and event type.
+ *
+ * Return pointer to structure or NULL.
+ */
+struct ltt_kernel_event *trace_create_kernel_event(struct lttng_event *ev)
+{
+ struct ltt_kernel_event *lke;
+ struct lttng_kernel_event *attr;
+
+ lke = malloc(sizeof(struct ltt_kernel_event));
+ attr = malloc(sizeof(struct lttng_kernel_event));
+ if (lke == NULL || attr == NULL) {
+ perror("kernel event malloc");
+ goto error;
+ }
+
+ switch (ev->type) {
+ case LTTNG_EVENT_PROBE:
+ attr->instrumentation = LTTNG_KERNEL_KPROBE;
+ attr->u.kprobe.addr = ev->attr.probe.addr;
+ attr->u.kprobe.offset = ev->attr.probe.offset;
+ strncpy(attr->u.kprobe.symbol_name,
+ ev->attr.probe.symbol_name, LTTNG_SYM_NAME_LEN);
+ break;
+ case LTTNG_EVENT_FUNCTION:
+ attr->instrumentation = LTTNG_KERNEL_FUNCTION;
+ strncpy(attr->u.ftrace.symbol_name,
+ ev->attr.ftrace.symbol_name, LTTNG_SYM_NAME_LEN);
+ break;
+ case LTTNG_EVENT_TRACEPOINT:
+ attr->instrumentation = LTTNG_KERNEL_TRACEPOINT;
+ break;
+ default:
+ ERR("Unknown kernel instrumentation type (%d)", ev->type);
+ goto error;
+ }
+
+ /* Copy event name */
+ strncpy(attr->name, ev->name, LTTNG_SYM_NAME_LEN);
+
+ /* Setting up a kernel event */
+ lke->fd = 0;
+ lke->event = attr;
+ lke->enabled = 1;
+
+ return lke;
+
+error: