+
+/*
+ * Create UST channel and enable it on the tracer.
+ */
+int channel_ust_create(struct ltt_ust_session *usession,
+ struct lttng_channel *chan, int sock)
+{
+ int ret;
+ struct lttng_channel *attr = chan;
+ struct ltt_ust_channel *suchan;
+ struct lttng_ust_channel_attr uattr;
+ struct object_data *obj;
+
+ /* Creating channel attributes if needed */
+ if (attr == NULL) {
+ /* FIXME: this appears to be a memory leak */
+ /* TODO: get default for other UST domains */
+ attr = channel_new_default_attr(LTTNG_DOMAIN_UST);
+ if (attr == NULL) {
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+ }
+
+ suchan = trace_ust_create_channel(attr, usession->path);
+ if (suchan == NULL) {
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+ uattr.overwrite = attr->attr.overwrite;
+ uattr.subbuf_size = attr->attr.subbuf_size;
+ uattr.num_subbuf = attr->attr.num_subbuf;
+ uattr.switch_timer_interval = attr->attr.switch_timer_interval;
+ uattr.read_timer_interval = attr->attr.read_timer_interval;
+ uattr.output = attr->attr.output;
+ ret = ustctl_create_channel(sock, usession->handle,
+ &uattr, &obj);
+ if (ret < 0) {
+ ret = LTTCOMM_UST_CHAN_FAIL;
+ goto error;
+ }
+ suchan->attr.overwrite = uattr.overwrite;
+ suchan->attr.subbuf_size = uattr.subbuf_size;
+ suchan->attr.num_subbuf = uattr.num_subbuf;
+ suchan->attr.switch_timer_interval = uattr.switch_timer_interval;
+ suchan->attr.read_timer_interval = uattr.read_timer_interval;
+ suchan->attr.output = uattr.output;
+ suchan->handle = obj->handle;
+ suchan->attr.shm_fd = obj->shm_fd;
+ suchan->attr.wait_fd = obj->wait_fd;
+ suchan->attr.memory_map_size = obj->memory_map_size;
+ suchan->obj = obj;
+
+ /* Add channel to session */
+ cds_list_add(&suchan->list, &usession->channels.head);
+ usession->channels.count++;
+
+ DBG2("Channel %s UST create successfully for sock:%d", suchan->name, sock);
+
+ ret = LTTCOMM_OK;
+
+error:
+ return ret;
+}
+
+/*
+ * Enable UST channel on the tracer.
+ */
+int channel_ust_enable(struct ltt_ust_session *usession,
+ struct ltt_ust_channel *uchan, int sock)
+{
+ int ret = LTTCOMM_OK;
+ struct object_data obj;
+
+ obj.handle = uchan->handle;
+ obj.shm_fd = uchan->attr.shm_fd;
+ obj.wait_fd = uchan->attr.wait_fd;
+ obj.memory_map_size = uchan->attr.memory_map_size;
+ ret = ustctl_enable(sock, &obj);
+ if (ret < 0) {
+ ret = LTTCOMM_UST_CHAN_FAIL;
+ goto end;
+ }
+ ret = LTTCOMM_OK;
+end:
+ return ret;
+}
+
+/*
+ * Disable UST channel on the tracer.
+ */
+int channel_ust_disable(struct ltt_ust_session *usession,
+ struct ltt_ust_channel *uchan, int sock)
+{
+ int ret = LTTCOMM_OK;
+ struct object_data obj;
+
+ obj.handle = uchan->handle;
+ obj.shm_fd = uchan->attr.shm_fd;
+ obj.wait_fd = uchan->attr.wait_fd;
+ obj.memory_map_size = uchan->attr.memory_map_size;
+ ret = ustctl_disable(sock, &obj);
+ if (ret < 0) {
+ ret = LTTCOMM_UST_CHAN_FAIL;
+ goto end;
+ }
+ ret = LTTCOMM_OK;
+end:
+ return ret;
+}