+void live_consume(struct bt_context **bt_ctx)
+{
+ int ret;
+ FILE *metadata_fp;
+
+ sem_wait(&metadata_available);
+ if (access("/tmp/livesession/kernel/metadata", F_OK) != 0) {
+ fprintf(stderr,"no metadata\n");
+ goto end;
+ }
+ metadata_fp = fopen("/tmp/livesession/kernel/metadata", "r");
+
+ *bt_ctx = bt_context_create();
+ ret = bt_context_add_trace(*bt_ctx, NULL, "ctf",
+ lttngtop_ctf_packet_seek, &mmap_list, metadata_fp);
+ if (ret < 0) {
+ printf("Error adding trace\n");
+ goto end;
+ }
+
+end:
+ return;
+}
+
+int setup_consumer(char *command_sock_path, pthread_t *threads,
+ struct lttng_consumer_local_data *ctx)
+{
+ int ret = 0;
+
+ ctx = helper_lttng_consumer_create(HELPER_LTTNG_CONSUMER_KERNEL,
+ read_subbuffer, NULL, on_recv_fd, on_update_fd);
+ if (!ctx)
+ goto end;
+
+ unlink(command_sock_path);
+ helper_lttng_consumer_set_command_sock_path(ctx, command_sock_path);
+ helper_lttng_consumer_init();
+
+ /* Create the thread to manage the receive of fd */
+ ret = pthread_create(&threads[0], NULL, helper_lttng_consumer_thread_sessiond_poll,
+ (void *) ctx);
+ if (ret != 0) {
+ perror("pthread_create receive fd");
+ goto end;
+ }
+ /* Create thread to manage the polling/writing of traces */
+ ret = pthread_create(&threads[1], NULL, helper_lttng_consumer_thread_metadata_poll,
+ (void *) ctx);
+ if (ret != 0) {
+ perror("pthread_create poll fd");
+ goto end;
+ }
+
+end:
+ return ret;
+}
+
+int enable_kprobes(struct lttng_handle *handle, char *channel_name)
+{
+ struct lttng_event ev;
+ struct kprobes *kprobe;
+ int ret = 0;
+ int i;
+
+ for (i = 0; i < lttngtop.kprobes_table->len; i++) {
+ kprobe = g_ptr_array_index(lttngtop.kprobes_table, i);
+
+ memset(&ev, '\0', sizeof(struct lttng_event));
+ ev.type = LTTNG_EVENT_PROBE;
+ if (kprobe->symbol_name)
+ sprintf(ev.attr.probe.symbol_name, "%s", kprobe->symbol_name);
+ sprintf(ev.name, "%s", kprobe->probe_name);
+ ev.attr.probe.addr = kprobe->probe_addr;
+ ev.attr.probe.offset = kprobe->probe_offset;
+ if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
+ fprintf(stderr,"error enabling kprobes : %s\n",
+ helper_lttcomm_get_readable_code(ret));
+ goto end;
+ }
+ }
+
+end:
+ return ret;
+}
+
+int setup_live_tracing()
+{
+ struct lttng_domain dom;
+ struct lttng_channel chan;
+ char *channel_name = "mmapchan";
+ struct lttng_event ev;
+ int ret = 0;
+ char *command_sock_path = "/tmp/consumerd_sock";
+ static pthread_t threads[2]; /* recv_fd, poll */
+ struct lttng_event_context kctxpid, kctxcomm, kctxppid, kctxtid;
+
+ struct lttng_handle *handle;
+
+ BT_INIT_LIST_HEAD(&mmap_list.head);
+
+ lttng_consumer_stream_array = g_ptr_array_new();
+
+ if ((ret = setup_consumer(command_sock_path, threads, ctx)) < 0) {
+ fprintf(stderr,"error setting up consumer\n");
+ goto error;
+ }
+
+ available_snapshots = g_ptr_array_new();
+
+ /* setup the session */
+ dom.type = LTTNG_DOMAIN_KERNEL;
+
+ ret = unlink("/tmp/livesession");
+
+ lttng_destroy_session("test");
+ if ((ret = lttng_create_session("test", "/tmp/livesession")) < 0) {
+ fprintf(stderr,"error creating the session : %s\n",
+ helper_lttcomm_get_readable_code(ret));
+ goto error;
+ }
+
+ if ((handle = lttng_create_handle("test", &dom)) == NULL) {
+ fprintf(stderr,"error creating handle\n");
+ goto error_session;
+ }
+
+ /*
+ * FIXME : need to let the
+ * helper_lttng_consumer_thread_receive_fds create the
+ * socket.
+ * Cleaner solution ?
+ */
+ while (access(command_sock_path, F_OK)) {
+ sleep(0.1);
+ }
+
+ if ((ret = lttng_register_consumer(handle, command_sock_path)) < 0) {
+ fprintf(stderr,"error registering consumer : %s\n",
+ helper_lttcomm_get_readable_code(ret));
+ goto error_session;
+ }
+
+ strcpy(chan.name, channel_name);
+ chan.attr.overwrite = 0;
+ if (opt_tid && opt_textdump) {
+ chan.attr.subbuf_size = 32768;
+ chan.attr.num_subbuf = 8;
+ } else {
+ //chan.attr.subbuf_size = 1048576; /* 1MB */
+ chan.attr.subbuf_size = 2097152; /* 1MB */
+ chan.attr.num_subbuf = 4;
+ }
+ chan.attr.switch_timer_interval = 0;
+ chan.attr.read_timer_interval = 200;
+ chan.attr.output = LTTNG_EVENT_MMAP;
+
+ if ((ret = lttng_enable_channel(handle, &chan)) < 0) {
+ fprintf(stderr,"error creating channel : %s\n",
+ helper_lttcomm_get_readable_code(ret));
+ goto error_session;
+ }
+
+ memset(&ev, '\0', sizeof(struct lttng_event));
+ ev.type = LTTNG_EVENT_TRACEPOINT;
+ sprintf(ev.name, "sched_switch");
+ if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
+ fprintf(stderr,"error enabling event %s : %s\n",
+ ev.name,
+ helper_lttcomm_get_readable_code(ret));
+ goto error_session;
+ }
+ sprintf(ev.name, "sched_process_free");
+ if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
+ fprintf(stderr,"error enabling event %s : %s\n",
+ ev.name,
+ helper_lttcomm_get_readable_code(ret));
+ goto error_session;
+ }
+ sprintf(ev.name, "lttng_statedump_process_state");
+ if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
+ fprintf(stderr,"error enabling event %s : %s\n",
+ ev.name,
+ helper_lttcomm_get_readable_code(ret));
+ goto error_session;
+ }
+ sprintf(ev.name, "lttng_statedump_file_descriptor");
+ if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
+ fprintf(stderr,"error enabling event %s : %s\n",
+ ev.name,
+ helper_lttcomm_get_readable_code(ret));
+ goto error_session;
+ }
+
+ memset(&ev, '\0', sizeof(struct lttng_event));
+ ev.type = LTTNG_EVENT_SYSCALL;
+ if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
+ fprintf(stderr,"error enabling syscalls : %s\n",
+ helper_lttcomm_get_readable_code(ret));
+ goto error_session;
+ }
+
+ if (lttngtop.kprobes_table) {
+ ret = enable_kprobes(handle, channel_name);
+ if (ret < 0) {
+ goto error_session;
+ }
+ }
+
+ kctxpid.ctx = LTTNG_EVENT_CONTEXT_PID;
+ lttng_add_context(handle, &kctxpid, NULL, NULL);
+ kctxtid.ctx = LTTNG_EVENT_CONTEXT_TID;
+ lttng_add_context(handle, &kctxtid, NULL, NULL);
+ kctxppid.ctx = LTTNG_EVENT_CONTEXT_PPID;
+ lttng_add_context(handle, &kctxppid, NULL, NULL);
+ kctxcomm.ctx = LTTNG_EVENT_CONTEXT_PROCNAME;
+ lttng_add_context(handle, &kctxcomm, NULL, NULL);
+ kctxpid.ctx = LTTNG_EVENT_CONTEXT_VPID;
+ lttng_add_context(handle, &kctxpid, NULL, NULL);
+ kctxtid.ctx = LTTNG_EVENT_CONTEXT_VTID;
+ lttng_add_context(handle, &kctxtid, NULL, NULL);
+ kctxtid.ctx = LTTNG_EVENT_CONTEXT_HOSTNAME;
+ lttng_add_context(handle, &kctxtid, NULL, NULL);
+
+ if ((ret = lttng_start_tracing("test")) < 0) {
+ fprintf(stderr,"error starting tracing : %s\n",
+ helper_lttcomm_get_readable_code(ret));
+ goto error_session;
+ }
+
+ helper_kernctl_buffer_flush(consumerd_metadata);
+
+ /* block until metadata is ready */
+ sem_init(&metadata_available, 0, 0);
+
+ return 0;
+
+error_session:
+ lttng_destroy_session("test");
+error:
+ return -1;
+}
+