+ int ret;
+ pid_t pid;
+
+ DBG("Spawning kconsumerd");
+
+ pid = fork();
+ if (pid == 0) {
+ /*
+ * Exec kconsumerd.
+ */
+ execlp("kconsumerd", "kconsumerd", "--verbose", NULL);
+ if (errno != 0) {
+ perror("kernel start consumer exec");
+ }
+ exit(EXIT_FAILURE);
+ } else if (pid > 0) {
+ ret = pid;
+ goto error;
+ } else {
+ perror("kernel start consumer fork");
+ ret = -errno;
+ goto error;
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * start_kconsumerd
+ *
+ * Spawn the kconsumerd daemon and session daemon thread.
+ */
+static int start_kconsumerd(void)
+{
+ int ret;
+
+ pthread_mutex_lock(&kconsumerd_pid_mutex);
+ if (kconsumerd_pid != 0) {
+ goto end;
+ }
+
+ ret = spawn_kconsumerd();
+ if (ret < 0) {
+ ERR("Spawning kconsumerd failed");
+ ret = LTTCOMM_KERN_CONSUMER_FAIL;
+ pthread_mutex_unlock(&kconsumerd_pid_mutex);
+ goto error;
+ }
+
+ /* Setting up the global kconsumerd_pid */
+ kconsumerd_pid = ret;
+ pthread_mutex_unlock(&kconsumerd_pid_mutex);
+
+ DBG("Kconsumerd pid %d", ret);
+
+ DBG("Spawning kconsumerd thread");
+ ret = spawn_kconsumerd_thread();
+ if (ret < 0) {
+ ERR("Fatal error spawning kconsumerd thread");
+ goto error;
+ }
+
+end:
+ pthread_mutex_unlock(&kconsumerd_pid_mutex);
+ return 0;
+
+error:
+ return ret;
+}
+
+/*
+ * init_kernel_tracer
+ *
+ * Setup necessary data for kernel tracer action.
+ */
+static void init_kernel_tracer(void)
+{
+ /* Set the global kernel tracer fd */
+ kernel_tracer_fd = open(DEFAULT_KERNEL_TRACER_PATH, O_RDWR);
+ if (kernel_tracer_fd < 0) {
+ WARN("No kernel tracer available");
+ kernel_tracer_fd = 0;
+ }
+
+ DBG("Kernel tracer fd %d", kernel_tracer_fd);
+}
+
+/*
+ * start_kernel_trace
+ *
+ * Start tracing by creating trace directory and sending FDs to the kernel
+ * consumer.
+ */
+static int start_kernel_trace(struct ltt_kernel_session *session)
+{
+ int ret;
+
+ /* Create trace directory */
+ ret = create_trace_dir(session);
+ if (ret < 0) {
+ if (ret == -EEXIST) {
+ ret = LTTCOMM_KERN_DIR_EXIST;
+ } else {
+ ret = LTTCOMM_KERN_DIR_FAIL;
+ goto error;
+ }
+ }
+
+ if (session->kconsumer_fds_sent == 0) {
+ ret = send_kconsumerd_fds(kconsumerd_cmd_sock, session);
+ if (ret < 0) {
+ ERR("Send kconsumerd fds failed");
+ ret = LTTCOMM_KERN_CONSUMER_FAIL;
+ goto error;
+ }
+
+ session->kconsumer_fds_sent = 1;
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * init_default_channel
+ *
+ * Allocate a channel structure and fill it.
+ */
+static struct lttng_channel *init_default_channel(void)
+{
+ struct lttng_channel *chan;
+
+ chan = malloc(sizeof(struct lttng_channel));
+ if (chan == NULL) {
+ perror("init channel malloc");
+ goto error;
+ }
+
+ if (snprintf(chan->name, NAME_MAX, DEFAULT_CHANNEL_NAME) < 0) {
+ perror("snprintf defautl channel name");
+ return NULL;
+ }
+
+ chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
+ chan->attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE;
+ chan->attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM;
+ chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
+ chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
+ chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
+
+error:
+ return chan;
+}
+
+/*
+ * create_kernel_session
+ *
+ * Create a kernel tracer session then create the default channel.
+ */
+static int create_kernel_session(struct ltt_session *session)
+{
+ int ret;
+ struct lttng_channel *chan;
+
+ DBG("Creating kernel session");
+
+ ret = kernel_create_session(session, kernel_tracer_fd);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_SESS_FAIL;
+ goto error;
+ }
+
+ chan = init_default_channel();
+ if (chan == NULL) {
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+
+ DBG("Creating default kernel channel %s", DEFAULT_CHANNEL_NAME);
+
+ ret = kernel_create_channel(session->kernel_session, chan);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_CHAN_FAIL;
+ goto error;
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * process_client_msg
+ *
+ * Process the command requested by the lttng client within the command
+ * context structure. This function make sure that the return structure (llm)
+ * is set and ready for transmission before returning.
+ *
+ * Return any error encountered or 0 for success.
+ */
+static int process_client_msg(struct command_ctx *cmd_ctx)
+{
+ int ret;
+
+ DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
+
+ /* Listing commands don't need a session */
+ switch (cmd_ctx->lsm->cmd_type) {
+ case LTTNG_CREATE_SESSION:
+ case LTTNG_LIST_SESSIONS:
+ case LTTNG_LIST_EVENTS:
+ case LTTNG_KERNEL_LIST_EVENTS:
+ case LTTNG_LIST_TRACEABLE_APPS:
+ break;
+ default:
+ DBG("Getting session %s by name", cmd_ctx->lsm->session_name);
+ cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session_name);
+ if (cmd_ctx->session == NULL) {
+ /* If session name not found */
+ if (cmd_ctx->lsm->session_name != NULL) {
+ ret = LTTCOMM_SESS_NOT_FOUND;
+ } else { /* If no session name specified */
+ ret = LTTCOMM_SELECT_SESS;
+ }
+ goto error;
+ }
+ break;
+ }
+
+ /*
+ * Check kernel command for kernel session.
+ */
+ switch (cmd_ctx->lsm->cmd_type) {
+ case LTTNG_KERNEL_ADD_CONTEXT:
+ case LTTNG_KERNEL_CREATE_CHANNEL:
+ case LTTNG_KERNEL_DISABLE_ALL_EVENT:
+ case LTTNG_KERNEL_DISABLE_CHANNEL:
+ case LTTNG_KERNEL_DISABLE_EVENT:
+ case LTTNG_KERNEL_ENABLE_ALL_EVENT:
+ case LTTNG_KERNEL_ENABLE_CHANNEL:
+ case LTTNG_KERNEL_ENABLE_EVENT:
+ case LTTNG_KERNEL_LIST_EVENTS:
+ /* Kernel tracer check */
+ if (kernel_tracer_fd == 0) {
+ init_kernel_tracer();
+ if (kernel_tracer_fd == 0) {
+ ret = LTTCOMM_KERN_NA;
+ goto error;
+ }
+ }
+
+ /* Need a session for kernel command */
+ if (cmd_ctx->lsm->cmd_type != LTTNG_KERNEL_LIST_EVENTS &&
+ cmd_ctx->session->kernel_session == NULL) {
+
+ ret = create_kernel_session(cmd_ctx->session);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_SESS_FAIL;
+ goto error;
+ }
+
+ /* Start the kernel consumer daemon */
+ if (kconsumerd_pid == 0) {
+ ret = start_kconsumerd();
+ if (ret < 0) {
+ goto error;
+ }
+ }
+ }
+ }
+
+ /* Connect to ust apps if available pid */
+ if (cmd_ctx->lsm->pid > 0) {
+ /* Connect to app using ustctl API */
+ cmd_ctx->ust_sock = ust_connect_app(cmd_ctx->lsm->pid);
+ if (cmd_ctx->ust_sock < 0) {
+ ret = LTTCOMM_NO_TRACEABLE;
+ goto error;
+ }
+ }
+
+ /* Process by command type */
+ switch (cmd_ctx->lsm->cmd_type) {
+ case LTTNG_KERNEL_ADD_CONTEXT:
+ {
+ int found = 0, no_event = 0;
+ struct ltt_kernel_channel *chan;
+ struct ltt_kernel_event *event;
+
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ /* Check if event name is given */
+ if (strlen(cmd_ctx->lsm->u.context.event_name) == 0) {
+ no_event = 1;
+ }
+
+ if (strlen(cmd_ctx->lsm->u.context.channel_name) == 0) {
+ /* Go over all channels */
+ DBG("Adding context to all channels");
+ cds_list_for_each_entry(chan,
+ &cmd_ctx->session->kernel_session->channel_list.head, list) {
+ if (no_event) {
+ ret = kernel_add_channel_context(chan,
+ &cmd_ctx->lsm->u.context.ctx);
+ if (ret < 0) {
+ continue;
+ }
+ } else {
+ event = get_kernel_event_by_name(cmd_ctx->lsm->u.context.event_name, chan);
+ if (event != NULL) {
+ ret = kernel_add_event_context(event,
+ &cmd_ctx->lsm->u.context.ctx);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_CONTEXT_FAIL;
+ goto error;
+ }
+ found = 1;
+ break;
+ }
+ }
+ }
+ } else {
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.context.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ if (no_event) {
+ ret = kernel_add_channel_context(chan,
+ &cmd_ctx->lsm->u.context.ctx);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_CONTEXT_FAIL;
+ goto error;
+ }
+ } else {
+ event = get_kernel_event_by_name(cmd_ctx->lsm->u.context.event_name, chan);
+ if (event != NULL) {
+ ret = kernel_add_event_context(event,
+ &cmd_ctx->lsm->u.context.ctx);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_CONTEXT_FAIL;
+ goto error;
+ }
+ }
+ }
+ }
+
+ if (!found && !no_event) {
+ ret = LTTCOMM_NO_EVENT;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_KERNEL_CREATE_CHANNEL:
+ {
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ /* Kernel tracer */
+ DBG("Creating kernel channel");
+
+ ret = kernel_create_channel(cmd_ctx->session->kernel_session,
+ &cmd_ctx->lsm->u.channel.chan);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_CHAN_FAIL;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_KERNEL_DISABLE_CHANNEL:
+ {
+ struct ltt_kernel_channel *chan;
+
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ } else if (chan->enabled == 1) {
+ ret = kernel_disable_channel(chan);
+ if (ret < 0) {
+ if (ret != EEXIST) {
+ ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL;
+ }
+ goto error;
+ }
+ }
+
+ kernel_wait_quiescent(kernel_tracer_fd);
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_KERNEL_DISABLE_EVENT:
+ {
+ struct ltt_kernel_channel *chan;
+ struct ltt_kernel_event *ev;
+
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ ev = get_kernel_event_by_name(cmd_ctx->lsm->u.disable.name, chan);
+ if (ev != NULL) {
+ DBG("Disabling kernel event %s for channel %s.",
+ cmd_ctx->lsm->u.disable.name, cmd_ctx->lsm->u.disable.channel_name);
+ ret = kernel_disable_event(ev);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_ENABLE_FAIL;
+ goto error;
+ }
+ }
+
+ kernel_wait_quiescent(kernel_tracer_fd);
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_KERNEL_DISABLE_ALL_EVENT:
+ {
+ struct ltt_kernel_channel *chan;
+ struct ltt_kernel_event *ev;
+
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ DBG("Disabling all enabled kernel events");
+
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.disable.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ /* For each event in the kernel session */
+ cds_list_for_each_entry(ev, &chan->events_list.head, list) {
+ DBG("Disabling kernel event %s for channel %s.",
+ ev->event->name, cmd_ctx->lsm->u.disable.channel_name);
+ ret = kernel_disable_event(ev);
+ if (ret < 0) {
+ continue;
+ }
+ }
+
+ /* Quiescent wait after event disable */
+ kernel_wait_quiescent(kernel_tracer_fd);
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_KERNEL_ENABLE_CHANNEL:
+ {
+ struct ltt_kernel_channel *chan;
+
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ } else if (chan->enabled == 0) {
+ ret = kernel_enable_channel(chan);
+ if (ret < 0) {
+ if (ret != EEXIST) {
+ ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL;
+ }
+ goto error;
+ }
+ }
+
+ kernel_wait_quiescent(kernel_tracer_fd);
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_KERNEL_ENABLE_EVENT:
+ {
+ struct ltt_kernel_channel *chan;
+ struct ltt_kernel_event *ev;
+
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ ev = get_kernel_event_by_name(cmd_ctx->lsm->u.enable.event.name, chan);
+ if (ev == NULL) {
+ DBG("Creating kernel event %s for channel %s.",
+ cmd_ctx->lsm->u.enable.event.name, chan->channel->name);
+ ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, chan);
+ } else {
+ DBG("Enabling kernel event %s for channel %s.",
+ cmd_ctx->lsm->u.enable.event.name, chan->channel->name);
+ ret = kernel_enable_event(ev);
+ }
+
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_ENABLE_FAIL;
+ goto error;
+ }
+
+ kernel_wait_quiescent(kernel_tracer_fd);
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_KERNEL_ENABLE_ALL_EVENT:
+ {
+ int pos, size;
+ char *event_list, *event, *ptr;
+ struct ltt_kernel_channel *chan;
+ struct ltt_kernel_event *ev;
+ struct lttng_event ev_attr;
+
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ DBG("Enabling all kernel event");
+
+ chan = get_kernel_channel_by_name(cmd_ctx->lsm->u.enable.channel_name,
+ cmd_ctx->session->kernel_session);
+ if (chan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ /* For each event in the kernel session */
+ cds_list_for_each_entry(ev, &chan->events_list.head, list) {
+ DBG("Enabling kernel event %s for channel %s.",
+ ev->event->name, chan->channel->name);
+ ret = kernel_enable_event(ev);
+ if (ret < 0) {
+ continue;
+ }
+ }
+
+ size = kernel_list_events(kernel_tracer_fd, &event_list);
+ if (size < 0) {
+ ret = LTTCOMM_KERN_LIST_FAIL;
+ goto error;
+ }
+
+ ptr = event_list;
+ while ((size = sscanf(ptr, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) {
+ ev = get_kernel_event_by_name(event, chan);
+ if (ev == NULL) {
+ strncpy(ev_attr.name, event, LTTNG_SYM_NAME_LEN);
+ /* Default event type for enable all */
+ ev_attr.type = LTTNG_EVENT_TRACEPOINTS;
+ /* Enable each single tracepoint event */
+ ret = kernel_create_event(&ev_attr, chan);
+ if (ret < 0) {
+ /* Ignore error here and continue */
+ }
+ }
+
+ /* Move pointer to the next line */
+ ptr += pos + 1;
+ free(event);
+ }
+
+ free(event_list);
+
+ /* Quiescent wait after event enable */
+ kernel_wait_quiescent(kernel_tracer_fd);
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_KERNEL_LIST_EVENTS:
+ {
+ char *event_list;
+ ssize_t size = 0;
+
+ DBG("Listing kernel events");
+
+ size = kernel_list_events(kernel_tracer_fd, &event_list);
+ if (size < 0) {
+ ret = LTTCOMM_KERN_LIST_FAIL;
+ goto error;
+ }
+
+ /*
+ * Setup lttng message with payload size set to the event list size in
+ * bytes and then copy list into the llm payload.
+ */
+ ret = setup_lttng_msg(cmd_ctx, size);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ /* Copy event list into message payload */
+ memcpy(cmd_ctx->llm->payload, event_list, size);
+
+ free(event_list);
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_START_TRACE:
+ {
+ struct ltt_kernel_channel *chan;
+
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ /* Kernel tracing */
+ if (cmd_ctx->session->kernel_session != NULL) {
+ if (cmd_ctx->session->kernel_session->metadata == NULL) {
+ DBG("Open kernel metadata");
+ ret = kernel_open_metadata(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_META_FAIL;
+ goto error;
+ }
+ }
+
+ if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) {
+ DBG("Opening kernel metadata stream");
+ if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) {
+ ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ERR("Kernel create metadata stream failed");
+ ret = LTTCOMM_KERN_STREAM_FAIL;
+ goto error;
+ }
+ }
+ }
+
+ /* For each channel */
+ cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) {
+ if (chan->stream_count == 0) {
+ ret = kernel_open_channel_stream(chan);
+ if (ret < 0) {
+ ERR("Kernel create channel stream failed");
+ ret = LTTCOMM_KERN_STREAM_FAIL;
+ goto error;
+ }
+ /* Update the stream global counter */
+ cmd_ctx->session->kernel_session->stream_count_global += ret;
+ }
+ }
+
+ DBG("Start kernel tracing");
+ ret = kernel_start_session(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ERR("Kernel start session failed");
+ ret = LTTCOMM_KERN_START_FAIL;
+ goto error;
+ }
+
+ ret = start_kernel_trace(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_START_FAIL;
+ goto error;
+ }
+
+ /* Quiescent wait after starting trace */
+ kernel_wait_quiescent(kernel_tracer_fd);
+ }
+
+ /* TODO: Start all UST traces */
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_STOP_TRACE:
+ {
+ struct ltt_kernel_channel *chan;
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ /* Kernel tracer */
+ if (cmd_ctx->session->kernel_session != NULL) {
+ DBG("Stop kernel tracing");
+
+ ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd);
+ if (ret < 0) {
+ ERR("Kernel metadata flush failed");
+ }
+
+ cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) {
+ ret = kernel_flush_buffer(chan);
+ if (ret < 0) {
+ ERR("Kernel flush buffer error");
+ }
+ }
+
+ ret = kernel_stop_session(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ERR("Kernel stop session failed");
+ ret = LTTCOMM_KERN_STOP_FAIL;
+ goto error;
+ }
+
+ /* Quiescent wait after stopping trace */
+ kernel_wait_quiescent(kernel_tracer_fd);
+ }
+
+ /* TODO : User-space tracer */
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_CREATE_SESSION:
+ {
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ ret = create_session(cmd_ctx->lsm->session_name, cmd_ctx->lsm->path);
+ if (ret < 0) {
+ if (ret == -EEXIST) {
+ ret = LTTCOMM_EXIST_SESS;
+ } else {
+ ret = LTTCOMM_FATAL;
+ }
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_DESTROY_SESSION:
+ {
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ /* Clean kernel session teardown */
+ teardown_kernel_session(cmd_ctx->session);
+
+ ret = destroy_session(cmd_ctx->lsm->session_name);
+ if (ret < 0) {
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ /*
+ case LTTNG_LIST_TRACES:
+ {
+ unsigned int trace_count;
+
+ trace_count = get_trace_count_per_session(cmd_ctx->session);
+ if (trace_count == 0) {
+ ret = LTTCOMM_NO_TRACE;
+ goto error;
+ }
+
+ ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_trace) * trace_count);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ get_traces_per_session(cmd_ctx->session,
+ (struct lttng_trace *)(cmd_ctx->llm->payload));
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ */
+ /*
+ case UST_CREATE_TRACE:
+ {
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ ret = ust_create_trace(cmd_ctx);
+ if (ret < 0) {
+ goto error;
+ }
+ break;
+ }
+ */
+ case LTTNG_LIST_TRACEABLE_APPS:
+ {
+ unsigned int app_count;
+
+ app_count = get_app_count();
+ DBG("Traceable application count : %d", app_count);
+ if (app_count == 0) {
+ ret = LTTCOMM_NO_APPS;
+ goto error;
+ }
+
+ ret = setup_lttng_msg(cmd_ctx, sizeof(pid_t) * app_count);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ get_app_list_pids((pid_t *)(cmd_ctx->llm->payload));
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ /*
+ case UST_START_TRACE:
+ {
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ ret = ust_start_trace(cmd_ctx);
+ if (ret < 0) {
+ goto setup_error;
+ }
+ break;
+ }
+ case UST_STOP_TRACE:
+ {
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }