--- /dev/null
+/*
+ * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ */
+
+#define _LGPL_SOURCE
+#include <lttng/trigger/trigger.h>
+#include <lttng/notification/channel-internal.h>
+#include <lttng/notification/notification-internal.h>
+#include <lttng/condition/condition-internal.h>
+#include <lttng/condition/buffer-usage-internal.h>
+#include <common/error.h>
+#include <common/config/session-config.h>
+#include <common/defaults.h>
+#include <common/utils.h>
+#include <common/align.h>
+#include <common/time.h>
+#include <sys/stat.h>
+#include <time.h>
+#include <signal.h>
+
+#include "notification-thread.h"
+#include "notification-thread-events.h"
+#include "notification-thread-commands.h"
+#include "lttng-sessiond.h"
+#include "health-sessiond.h"
+#include "thread.h"
+#include "testpoint.h"
+
+#include "kernel.h"
+#include <common/kernel-ctl/kernel-ctl.h>
+
+#include <urcu.h>
+#include <urcu/list.h>
+#include <urcu/rculfhash.h>
+
+
+int notifier_consumption_paused;
+/*
+ * Destroy the thread data previously created by the init function.
+ */
+void notification_thread_handle_destroy(
+ struct notification_thread_handle *handle)
+{
+ int ret;
+
+ if (!handle) {
+ goto end;
+ }
+
+ LTTNG_ASSERT(cds_list_empty(&handle->cmd_queue.list));
+ pthread_mutex_destroy(&handle->cmd_queue.lock);
+ sem_destroy(&handle->ready);
+
+ if (handle->cmd_queue.event_pipe) {
+ lttng_pipe_destroy(handle->cmd_queue.event_pipe);
+ }
+ if (handle->channel_monitoring_pipes.ust32_consumer >= 0) {
+ ret = close(handle->channel_monitoring_pipes.ust32_consumer);
+ if (ret) {
+ PERROR("close 32-bit consumer channel monitoring pipe");
+ }
+ }
+ if (handle->channel_monitoring_pipes.ust64_consumer >= 0) {
+ ret = close(handle->channel_monitoring_pipes.ust64_consumer);
+ if (ret) {
+ PERROR("close 64-bit consumer channel monitoring pipe");
+ }
+ }
+ if (handle->channel_monitoring_pipes.kernel_consumer >= 0) {
+ ret = close(handle->channel_monitoring_pipes.kernel_consumer);
+ if (ret) {
+ PERROR("close kernel consumer channel monitoring pipe");
+ }
+ }
+
+end:
+ free(handle);
+}
+
+struct notification_thread_handle *notification_thread_handle_create(
+ struct lttng_pipe *ust32_channel_monitor_pipe,
+ struct lttng_pipe *ust64_channel_monitor_pipe,
+ struct lttng_pipe *kernel_channel_monitor_pipe)
+{
+ int ret;
+ struct notification_thread_handle *handle;
+ struct lttng_pipe *event_pipe = NULL;
+
+ handle = (notification_thread_handle *) zmalloc(sizeof(*handle));
+ if (!handle) {
+ goto end;
+ }
+
+ sem_init(&handle->ready, 0, 0);
+
+ event_pipe = lttng_pipe_open(FD_CLOEXEC);
+ if (!event_pipe) {
+ ERR("event_pipe creation");
+ goto error;
+ }
+
+ handle->cmd_queue.event_pipe = event_pipe;
+ event_pipe = NULL;
+
+ CDS_INIT_LIST_HEAD(&handle->cmd_queue.list);
+ ret = pthread_mutex_init(&handle->cmd_queue.lock, NULL);
+ if (ret) {
+ goto error;
+ }
+
+ if (ust32_channel_monitor_pipe) {
+ handle->channel_monitoring_pipes.ust32_consumer =
+ lttng_pipe_release_readfd(
+ ust32_channel_monitor_pipe);
+ if (handle->channel_monitoring_pipes.ust32_consumer < 0) {
+ goto error;
+ }
+ } else {
+ handle->channel_monitoring_pipes.ust32_consumer = -1;
+ }
+ if (ust64_channel_monitor_pipe) {
+ handle->channel_monitoring_pipes.ust64_consumer =
+ lttng_pipe_release_readfd(
+ ust64_channel_monitor_pipe);
+ if (handle->channel_monitoring_pipes.ust64_consumer < 0) {
+ goto error;
+ }
+ } else {
+ handle->channel_monitoring_pipes.ust64_consumer = -1;
+ }
+ if (kernel_channel_monitor_pipe) {
+ handle->channel_monitoring_pipes.kernel_consumer =
+ lttng_pipe_release_readfd(
+ kernel_channel_monitor_pipe);
+ if (handle->channel_monitoring_pipes.kernel_consumer < 0) {
+ goto error;
+ }
+ } else {
+ handle->channel_monitoring_pipes.kernel_consumer = -1;
+ }
+
+end:
+ return handle;
+error:
+ lttng_pipe_destroy(event_pipe);
+ notification_thread_handle_destroy(handle);
+ return NULL;
+}
+
+static
+char *get_notification_channel_sock_path(void)
+{
+ int ret;
+ bool is_root = !getuid();
+ char *sock_path;
+
+ sock_path = (char *) zmalloc(LTTNG_PATH_MAX);
+ if (!sock_path) {
+ goto error;
+ }
+
+ if (is_root) {
+ ret = snprintf(sock_path, LTTNG_PATH_MAX,
+ DEFAULT_GLOBAL_NOTIFICATION_CHANNEL_UNIX_SOCK);
+ if (ret < 0) {
+ goto error;
+ }
+ } else {
+ const char *home_path = utils_get_home_dir();
+
+ if (!home_path) {
+ ERR("Can't get HOME directory for socket creation");
+ goto error;
+ }
+
+ ret = snprintf(sock_path, LTTNG_PATH_MAX,
+ DEFAULT_HOME_NOTIFICATION_CHANNEL_UNIX_SOCK,
+ home_path);
+ if (ret < 0) {
+ goto error;
+ }
+ }
+
+ return sock_path;
+error:
+ free(sock_path);
+ return NULL;
+}
+
+static
+void notification_channel_socket_destroy(int fd)
+{
+ int ret;
+ char *sock_path = get_notification_channel_sock_path();
+
+ DBG("Destroying notification channel socket");
+
+ if (sock_path) {
+ ret = unlink(sock_path);
+ free(sock_path);
+ if (ret < 0) {
+ PERROR("unlink notification channel socket");
+ }
+ }
+
+ ret = close(fd);
+ if (ret) {
+ PERROR("close notification channel socket");
+ }
+}
+
+static
+int notification_channel_socket_create(void)
+{
+ int fd = -1, ret;
+ char *sock_path = get_notification_channel_sock_path();
+
+ DBG("Creating notification channel UNIX socket at %s",
+ sock_path);
+
+ ret = lttcomm_create_unix_sock(sock_path);
+ if (ret < 0) {
+ ERR("Failed to create notification socket");
+ goto error;
+ }
+ fd = ret;
+
+ ret = chmod(sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+ if (ret < 0) {
+ ERR("Set file permissions failed: %s", sock_path);
+ PERROR("chmod notification channel socket");
+ goto error;
+ }
+
+ if (getuid() == 0) {
+ gid_t gid;
+
+ ret = utils_get_group_id(the_config.tracing_group_name.value,
+ true, &gid);
+ if (ret) {
+ /* Default to root group. */
+ gid = 0;
+ }
+
+ ret = chown(sock_path, 0, gid);
+ if (ret) {
+ ERR("Failed to set the notification channel socket's group");
+ ret = -1;
+ goto error;
+ }
+ }
+
+ DBG("Notification channel UNIX socket created (fd = %i)",
+ fd);
+ free(sock_path);
+ return fd;
+error:
+ if (fd >= 0 && close(fd) < 0) {
+ PERROR("close notification channel socket");
+ }
+ free(sock_path);
+ return ret;
+}
+
+static
+int init_poll_set(struct lttng_poll_event *poll_set,
+ struct notification_thread_handle *handle,
+ int notification_channel_socket)
+{
+ int ret;
+
+ /*
+ * Create pollset with size 5:
+ * - notification channel socket (listen for new connections),
+ * - command queue event fd (internal sessiond commands),
+ * - consumerd (32-bit user space) channel monitor pipe,
+ * - consumerd (64-bit user space) channel monitor pipe,
+ * - consumerd (kernel) channel monitor pipe.
+ */
+ ret = lttng_poll_create(poll_set, 5, LTTNG_CLOEXEC);
+ if (ret < 0) {
+ goto end;
+ }
+
+ ret = lttng_poll_add(poll_set, notification_channel_socket,
+ LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP);
+ if (ret < 0) {
+ ERR("Failed to add notification channel socket to pollset");
+ goto error;
+ }
+ ret = lttng_poll_add(poll_set, lttng_pipe_get_readfd(handle->cmd_queue.event_pipe),
+ LPOLLIN | LPOLLERR);
+ if (ret < 0) {
+ ERR("Failed to add notification command queue event fd to pollset");
+ goto error;
+ }
+ ret = lttng_poll_add(poll_set,
+ handle->channel_monitoring_pipes.ust32_consumer,
+ LPOLLIN | LPOLLERR);
+ if (ret < 0) {
+ ERR("Failed to add ust-32 channel monitoring pipe fd to pollset");
+ goto error;
+ }
+ ret = lttng_poll_add(poll_set,
+ handle->channel_monitoring_pipes.ust64_consumer,
+ LPOLLIN | LPOLLERR);
+ if (ret < 0) {
+ ERR("Failed to add ust-64 channel monitoring pipe fd to pollset");
+ goto error;
+ }
+ if (handle->channel_monitoring_pipes.kernel_consumer < 0) {
+ goto end;
+ }
+ ret = lttng_poll_add(poll_set,
+ handle->channel_monitoring_pipes.kernel_consumer,
+ LPOLLIN | LPOLLERR);
+ if (ret < 0) {
+ ERR("Failed to add kernel channel monitoring pipe fd to pollset");
+ goto error;
+ }
+end:
+ return ret;
+error:
+ lttng_poll_clean(poll_set);
+ return ret;
+}
+
+static
+void fini_thread_state(struct notification_thread_state *state)
+{
+ int ret;
+
+ if (state->client_socket_ht) {
+ ret = handle_notification_thread_client_disconnect_all(state);
+ LTTNG_ASSERT(!ret);
+ ret = cds_lfht_destroy(state->client_socket_ht, NULL);
+ LTTNG_ASSERT(!ret);
+ }
+ if (state->client_id_ht) {
+ ret = cds_lfht_destroy(state->client_id_ht, NULL);
+ LTTNG_ASSERT(!ret);
+ }
+ if (state->triggers_ht) {
+ ret = handle_notification_thread_trigger_unregister_all(state);
+ LTTNG_ASSERT(!ret);
+ ret = cds_lfht_destroy(state->triggers_ht, NULL);
+ LTTNG_ASSERT(!ret);
+ }
+ if (state->channel_triggers_ht) {
+ ret = cds_lfht_destroy(state->channel_triggers_ht, NULL);
+ LTTNG_ASSERT(!ret);
+ }
+ if (state->channel_state_ht) {
+ ret = cds_lfht_destroy(state->channel_state_ht, NULL);
+ LTTNG_ASSERT(!ret);
+ }
+ if (state->notification_trigger_clients_ht) {
+ ret = cds_lfht_destroy(state->notification_trigger_clients_ht,
+ NULL);
+ LTTNG_ASSERT(!ret);
+ }
+ if (state->channels_ht) {
+ ret = cds_lfht_destroy(state->channels_ht, NULL);
+ LTTNG_ASSERT(!ret);
+ }
+ if (state->sessions_ht) {
+ ret = cds_lfht_destroy(state->sessions_ht, NULL);
+ LTTNG_ASSERT(!ret);
+ }
+ if (state->triggers_by_name_uid_ht) {
+ ret = cds_lfht_destroy(state->triggers_by_name_uid_ht, NULL);
+ LTTNG_ASSERT(!ret);
+ }
+ if (state->trigger_tokens_ht) {
+ ret = cds_lfht_destroy(state->trigger_tokens_ht, NULL);
+ LTTNG_ASSERT(!ret);
+ }
+ /*
+ * Must be destroyed after all channels have been destroyed.
+ * See comment in struct lttng_session_trigger_list.
+ */
+ if (state->session_triggers_ht) {
+ ret = cds_lfht_destroy(state->session_triggers_ht, NULL);
+ LTTNG_ASSERT(!ret);
+ }
+ if (state->notification_channel_socket >= 0) {
+ notification_channel_socket_destroy(
+ state->notification_channel_socket);
+ }
+
+ LTTNG_ASSERT(cds_list_empty(&state->tracer_event_sources_list));
+
+ if (state->executor) {
+ action_executor_destroy(state->executor);
+ }
+ lttng_poll_clean(&state->events);
+}
+
+static
+void mark_thread_as_ready(struct notification_thread_handle *handle)
+{
+ DBG("Marking notification thread as ready");
+ sem_post(&handle->ready);
+}
+
+static
+void wait_until_thread_is_ready(struct notification_thread_handle *handle)
+{
+ DBG("Waiting for notification thread to be ready");
+ sem_wait(&handle->ready);
+ DBG("Notification thread is ready");
+}
+
+static
+int init_thread_state(struct notification_thread_handle *handle,
+ struct notification_thread_state *state)
+{
+ int ret;
+
+ memset(state, 0, sizeof(*state));
+ state->notification_channel_socket = -1;
+ state->trigger_id.next_tracer_token = 1;
+ lttng_poll_init(&state->events);
+
+ ret = notification_channel_socket_create();
+ if (ret < 0) {
+ goto end;
+ }
+ state->notification_channel_socket = ret;
+
+ ret = init_poll_set(&state->events, handle,
+ state->notification_channel_socket);
+ if (ret) {
+ goto end;
+ }
+
+ DBG("Listening on notification channel socket");
+ ret = lttcomm_listen_unix_sock(state->notification_channel_socket);
+ if (ret < 0) {
+ ERR("Listen failed on notification channel socket");
+ goto error;
+ }
+
+ state->client_socket_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0,
+ CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
+ if (!state->client_socket_ht) {
+ goto error;
+ }
+
+ state->client_id_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0,
+ CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
+ if (!state->client_id_ht) {
+ goto error;
+ }
+
+ state->channel_triggers_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0,
+ CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
+ if (!state->channel_triggers_ht) {
+ goto error;
+ }
+
+ state->session_triggers_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0,
+ CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
+ if (!state->session_triggers_ht) {
+ goto error;
+ }
+
+ state->channel_state_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0,
+ CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
+ if (!state->channel_state_ht) {
+ goto error;
+ }
+
+ state->notification_trigger_clients_ht = cds_lfht_new(DEFAULT_HT_SIZE,
+ 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
+ if (!state->notification_trigger_clients_ht) {
+ goto error;
+ }
+
+ state->channels_ht = cds_lfht_new(DEFAULT_HT_SIZE,
+ 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
+ if (!state->channels_ht) {
+ goto error;
+ }
+ state->sessions_ht = cds_lfht_new(DEFAULT_HT_SIZE,
+ 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
+ if (!state->sessions_ht) {
+ goto error;
+ }
+ state->triggers_ht = cds_lfht_new(DEFAULT_HT_SIZE,
+ 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
+ if (!state->triggers_ht) {
+ goto error;
+ }
+ state->triggers_by_name_uid_ht = cds_lfht_new(DEFAULT_HT_SIZE,
+ 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
+ if (!state->triggers_by_name_uid_ht) {
+ goto error;
+ }
+
+ state->trigger_tokens_ht = cds_lfht_new(DEFAULT_HT_SIZE,
+ 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
+ if (!state->trigger_tokens_ht) {
+ goto error;
+ }
+
+ CDS_INIT_LIST_HEAD(&state->tracer_event_sources_list);
+
+ state->executor = action_executor_create(handle);
+ if (!state->executor) {
+ goto error;
+ }
+
+ state->restart_poll = false;
+
+ mark_thread_as_ready(handle);
+end:
+ return 0;
+error:
+ fini_thread_state(state);
+ return -1;
+}
+
+static
+int handle_channel_monitoring_pipe(int fd, uint32_t revents,
+ struct notification_thread_handle *handle,
+ struct notification_thread_state *state)
+{
+ int ret = 0;
+ enum lttng_domain_type domain;
+
+ if (fd == handle->channel_monitoring_pipes.ust32_consumer ||
+ fd == handle->channel_monitoring_pipes.ust64_consumer) {
+ domain = LTTNG_DOMAIN_UST;
+ } else if (fd == handle->channel_monitoring_pipes.kernel_consumer) {
+ domain = LTTNG_DOMAIN_KERNEL;
+ } else {
+ abort();
+ }
+
+ if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
+ ret = lttng_poll_del(&state->events, fd);
+ if (ret) {
+ ERR("Failed to remove consumer monitoring pipe from poll set");
+ }
+ goto end;
+ }
+
+ ret = handle_notification_thread_channel_sample(
+ state, fd, domain);
+ if (ret) {
+ ERR("Consumer sample handling error occurred");
+ ret = -1;
+ goto end;
+ }
+end:
+ return ret;
+}
+
+static int handle_event_notification_pipe(int event_source_fd,
+ enum lttng_domain_type domain,
+ uint32_t revents,
+ struct notification_thread_state *state)
+{
+ int ret = 0;
+
+ if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
+ ret = handle_notification_thread_tracer_event_source_died(
+ state, event_source_fd);
+ if (ret) {
+ ERR("Failed to remove event notification pipe from poll set: fd = %d",
+ event_source_fd);
+ }
+ goto end;
+ }
+
+ if (testpoint(sessiond_handle_notifier_event_pipe)) {
+ ret = 0;
+ goto end;
+ }
+
+ if (caa_unlikely(notifier_consumption_paused)) {
+ DBG("Event notifier notification consumption paused, sleeping...");
+ sleep(1);
+ goto end;
+ }
+
+ ret = handle_notification_thread_event_notification(
+ state, event_source_fd, domain);
+ if (ret) {
+ ERR("Event notification handling error occurred for fd: %d",
+ event_source_fd);
+ ret = -1;
+ goto end;
+ }
+
+end:
+ return ret;
+}
+
+/*
+ * Return the event source domain type via parameter.
+ */
+static bool fd_is_event_notification_source(const struct notification_thread_state *state,
+ int fd,
+ enum lttng_domain_type *domain)
+{
+ struct notification_event_tracer_event_source_element *source_element;
+
+ LTTNG_ASSERT(domain);
+
+ cds_list_for_each_entry(source_element,
+ &state->tracer_event_sources_list, node) {
+ if (source_element->fd != fd) {
+ continue;
+ }
+
+ *domain = source_element->domain;
+ return true;
+ }
+
+ return false;
+}
+
+/*
+ * This thread services notification channel clients and commands received
+ * from various lttng-sessiond components over a command queue.
+ */
+static
+void *thread_notification(void *data)
+{
+ int ret;
+ struct notification_thread_handle *handle = (notification_thread_handle *) data;
+ struct notification_thread_state state;
+ enum lttng_domain_type domain;
+
+ DBG("Started notification thread");
+
+ health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_NOTIFICATION);
+ rcu_register_thread();
+ rcu_thread_online();
+
+ if (!handle) {
+ ERR("Invalid thread context provided");
+ goto end;
+ }
+
+ health_code_update();
+
+ ret = init_thread_state(handle, &state);
+ if (ret) {
+ goto end;
+ }
+
+ if (testpoint(sessiond_thread_notification)) {
+ goto end;
+ }
+
+ while (true) {
+ int fd_count, i;
+
+ health_poll_entry();
+ DBG("Entering poll wait");
+ ret = lttng_poll_wait(&state.events, -1);
+ DBG("Poll wait returned (%i)", ret);
+ health_poll_exit();
+ if (ret < 0) {
+ /*
+ * Restart interrupted system call.
+ */
+ if (errno == EINTR) {
+ continue;
+ }
+ ERR("Error encountered during lttng_poll_wait (%i)", ret);
+ goto error;
+ }
+
+ /*
+ * Reset restart_poll flag so that calls below might turn it
+ * on.
+ */
+ state.restart_poll = false;
+
+ fd_count = ret;
+ for (i = 0; i < fd_count; i++) {
+ int fd = LTTNG_POLL_GETFD(&state.events, i);
+ uint32_t revents = LTTNG_POLL_GETEV(&state.events, i);
+
+ DBG("Handling fd (%i) activity (%u)", fd, revents);
+
+ if (fd == state.notification_channel_socket) {
+ if (revents & LPOLLIN) {
+ ret = handle_notification_thread_client_connect(
+ &state);
+ if (ret < 0) {
+ goto error;
+ }
+ } else if (revents &
+ (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
+ ERR("Notification socket poll error");
+ goto error;
+ } else {
+ ERR("Unexpected poll events %u for notification socket %i", revents, fd);
+ goto error;
+ }
+ } else if (fd == lttng_pipe_get_readfd(handle->cmd_queue.event_pipe)) {
+ ret = handle_notification_thread_command(handle,
+ &state);
+ if (ret < 0) {
+ DBG("Error encountered while servicing command queue");
+ goto error;
+ } else if (ret > 0) {
+ goto exit;
+ }
+ } else if (fd == handle->channel_monitoring_pipes.ust32_consumer ||
+ fd == handle->channel_monitoring_pipes.ust64_consumer ||
+ fd == handle->channel_monitoring_pipes.kernel_consumer) {
+ ret = handle_channel_monitoring_pipe(fd,
+ revents, handle, &state);
+ if (ret) {
+ goto error;
+ }
+ } else if (fd_is_event_notification_source(&state, fd, &domain)) {
+ ret = handle_event_notification_pipe(fd, domain, revents, &state);
+ if (ret) {
+ goto error;
+ }
+ } else {
+ /* Activity on a client's socket. */
+ if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
+ /*
+ * It doesn't matter if a command was
+ * pending on the client socket at this
+ * point since it now has no way to
+ * receive the notifications to which
+ * it was subscribing or unsubscribing.
+ */
+ ret = handle_notification_thread_client_disconnect(
+ fd, &state);
+ if (ret) {
+ goto error;
+ }
+ } else {
+ if (revents & LPOLLIN) {
+ ret = handle_notification_thread_client_in(
+ &state, fd);
+ if (ret) {
+ goto error;
+ }
+ }
+
+ if (revents & LPOLLOUT) {
+ ret = handle_notification_thread_client_out(
+ &state, fd);
+ if (ret) {
+ goto error;
+ }
+ }
+ }
+ }
+
+ /*
+ * Calls above might have changed the state of the
+ * FDs in `state.events`. Call _poll_wait() again to
+ * ensure we have a consistent state.
+ */
+ if (state.restart_poll) {
+ break;
+ }
+ }
+ }
+exit:
+error:
+ fini_thread_state(&state);
+end:
+ rcu_thread_offline();
+ rcu_unregister_thread();
+ health_unregister(the_health_sessiond);
+ return NULL;
+}
+
+static
+bool shutdown_notification_thread(void *thread_data)
+{
+ struct notification_thread_handle *handle = (notification_thread_handle *) thread_data;
+
+ notification_thread_command_quit(handle);
+ return true;
+}
+
+struct lttng_thread *launch_notification_thread(
+ struct notification_thread_handle *handle)
+{
+ struct lttng_thread *thread;
+
+ thread = lttng_thread_create("Notification",
+ thread_notification,
+ shutdown_notification_thread,
+ NULL,
+ handle);
+ if (!thread) {
+ goto error;
+ }
+
+ /*
+ * Wait for the thread to be marked as "ready" before returning
+ * as other subsystems depend on the notification subsystem
+ * (e.g. rotation thread).
+ */
+ wait_until_thread_is_ready(handle);
+ return thread;
+error:
+ return NULL;
+}
projects / lttng-tools.git / blobdiff