- while (1) {
- DBG("Accepting application registration");
-
- nb_fd = LTTNG_POLL_GETNB(&events);
-
- /* Inifinite blocking call, waiting for transmission */
- restart:
- ret = lttng_poll_wait(&events, -1);
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- goto restart;
- }
- goto error;
- }
-
- for (i = 0; i < nb_fd; i++) {
- /* Fetch once the poll data */
- revents = LTTNG_POLL_GETEV(&events, i);
- pollfd = LTTNG_POLL_GETFD(&events, i);
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = check_thread_quit_pipe(pollfd, revents);
- if (ret) {
- goto error;
- }
-
- /* Event on the registration socket */
- if (pollfd == apps_sock) {
- if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("Register apps socket poll error");
- goto error;
- } else if (revents & LPOLLIN) {
- sock = lttcomm_accept_unix_sock(apps_sock);
- if (sock < 0) {
- goto error;
- }
-
- /* Create UST registration command for enqueuing */
- ust_cmd = zmalloc(sizeof(struct ust_command));
- if (ust_cmd == NULL) {
- PERROR("ust command zmalloc");
- goto error;
- }
-
- /*
- * Using message-based transmissions to ensure we don't
- * have to deal with partially received messages.
- */
- ret = lttng_fd_get(LTTNG_FD_APPS, 1);
- if (ret < 0) {
- ERR("Exhausted file descriptors allowed for applications.");
- free(ust_cmd);
- ret = close(sock);
- if (ret) {
- PERROR("close");
- }
- sock = -1;
- continue;
- }
- ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
- sizeof(struct ust_register_msg));
- if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
- if (ret < 0) {
- PERROR("lttcomm_recv_unix_sock register apps");
- } else {
- ERR("Wrong size received on apps register");
- }
- free(ust_cmd);
- ret = close(sock);
- if (ret) {
- PERROR("close");
- }
- lttng_fd_put(LTTNG_FD_APPS, 1);
- sock = -1;
- continue;
- }
-
- ust_cmd->sock = sock;
- sock = -1;
-
- DBG("UST registration received with pid:%d ppid:%d uid:%d"
- " gid:%d sock:%d name:%s (version %d.%d)",
- ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
- ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
- ust_cmd->sock, ust_cmd->reg_msg.name,
- ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
-
- /*
- * Lock free enqueue the registration request. The red pill
- * has been taken! This apps will be part of the *system*.
- */
- cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
-
- /*
- * Wake the registration queue futex. Implicit memory
- * barrier with the exchange in cds_wfq_enqueue.
- */
- futex_nto1_wake(&ust_cmd_queue.futex);
- }
- }
- }
- }
-
-error:
- /* Notify that the registration thread is gone */
- notify_ust_apps(0);
-
- if (apps_sock >= 0) {
- ret = close(apps_sock);
- if (ret) {
- PERROR("close");
- }
- }
- if (sock >= 0) {
- ret = close(sock);
- if (ret) {
- PERROR("close");
- }
- lttng_fd_put(LTTNG_FD_APPS, 1);
- }
- unlink(apps_unix_sock_path);
-
-error_poll_add:
- lttng_poll_clean(&events);
-error_listen:
-error_create_poll:
- DBG("UST Registration thread cleanup complete");
-
- return NULL;
-}
-
-/*
- * Start the thread_manage_consumer. This must be done after a lttng-consumerd
- * exec or it will fails.
- */
-static int spawn_consumer_thread(struct consumer_data *consumer_data)
-{
- int ret;
- struct timespec timeout;
-
- timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
- timeout.tv_nsec = 0;
-
- /* Setup semaphore */
- ret = sem_init(&consumer_data->sem, 0, 0);
- if (ret < 0) {
- PERROR("sem_init consumer semaphore");
- goto error;
- }
-
- ret = pthread_create(&consumer_data->thread, NULL,
- thread_manage_consumer, consumer_data);
- if (ret != 0) {
- PERROR("pthread_create consumer");
- ret = -1;
- goto error;
- }
-
- /* Get time for sem_timedwait absolute timeout */
- ret = clock_gettime(CLOCK_REALTIME, &timeout);
- if (ret < 0) {
- PERROR("clock_gettime spawn consumer");
- /* Infinite wait for the kconsumerd thread to be ready */
- ret = sem_wait(&consumer_data->sem);
- } else {
- /* Normal timeout if the gettime was successful */
- timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
- ret = sem_timedwait(&consumer_data->sem, &timeout);
- }
-
- if (ret < 0) {
- if (errno == ETIMEDOUT) {
- /*
- * Call has timed out so we kill the kconsumerd_thread and return
- * an error.
- */
- ERR("The consumer thread was never ready. Killing it");
- ret = pthread_cancel(consumer_data->thread);
- if (ret < 0) {
- PERROR("pthread_cancel consumer thread");
- }
- } else {
- PERROR("semaphore wait failed consumer thread");
- }
- goto error;
- }
-
- pthread_mutex_lock(&consumer_data->pid_mutex);
- if (consumer_data->pid == 0) {
- ERR("Kconsumerd did not start");
- pthread_mutex_unlock(&consumer_data->pid_mutex);
- goto error;
- }
- pthread_mutex_unlock(&consumer_data->pid_mutex);
-
- return 0;
-
-error:
- return ret;
-}
-
-/*
- * Join consumer thread
- */
-static int join_consumer_thread(struct consumer_data *consumer_data)
-{
- void *status;
- int ret;
-
- if (consumer_data->pid != 0) {
- ret = kill(consumer_data->pid, SIGTERM);
- if (ret) {
- ERR("Error killing consumer daemon");
- return ret;
- }
- return pthread_join(consumer_data->thread, &status);
- } else {
- return 0;
- }
-}
-
-/*
- * Fork and exec a consumer daemon (consumerd).
- *
- * Return pid if successful else -1.
- */
-static pid_t spawn_consumerd(struct consumer_data *consumer_data)
-{
- int ret;
- pid_t pid;
- const char *consumer_to_use;
- const char *verbosity;
- struct stat st;
-
- DBG("Spawning consumerd");
-
- pid = fork();
- if (pid == 0) {
- /*
- * Exec consumerd.
- */
- if (opt_verbose_consumer) {
- verbosity = "--verbose";
- } else {
- verbosity = "--quiet";
- }
- switch (consumer_data->type) {
- case LTTNG_CONSUMER_KERNEL:
- /*
- * Find out which consumerd to execute. We will first try the
- * 64-bit path, then the sessiond's installation directory, and
- * fallback on the 32-bit one,
- */
- DBG3("Looking for a kernel consumer at these locations:");
- DBG3(" 1) %s", consumerd64_bin);
- DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
- DBG3(" 3) %s", consumerd32_bin);
- if (stat(consumerd64_bin, &st) == 0) {
- DBG3("Found location #1");
- consumer_to_use = consumerd64_bin;
- } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
- DBG3("Found location #2");
- consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
- } else if (stat(consumerd32_bin, &st) == 0) {
- DBG3("Found location #3");
- consumer_to_use = consumerd32_bin;
- } else {
- DBG("Could not find any valid consumerd executable");
- break;
- }
- DBG("Using kernel consumer at: %s", consumer_to_use);
- execl(consumer_to_use,
- "lttng-consumerd", verbosity, "-k",
- "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
- "--consumerd-err-sock", consumer_data->err_unix_sock_path,
- NULL);
- break;
- case LTTNG_CONSUMER64_UST:
- {
- char *tmpnew = NULL;
-
- if (consumerd64_libdir[0] != '\0') {
- char *tmp;
- size_t tmplen;
-
- tmp = getenv("LD_LIBRARY_PATH");
- if (!tmp) {
- tmp = "";
- }
- tmplen = strlen("LD_LIBRARY_PATH=")
- + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
- tmpnew = zmalloc(tmplen + 1 /* \0 */);
- if (!tmpnew) {
- ret = -ENOMEM;
- goto error;
- }
- strcpy(tmpnew, "LD_LIBRARY_PATH=");
- strcat(tmpnew, consumerd64_libdir);
- if (tmp[0] != '\0') {
- strcat(tmpnew, ":");
- strcat(tmpnew, tmp);
- }
- ret = putenv(tmpnew);
- if (ret) {
- ret = -errno;
- goto error;
- }
- }
- DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
- ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
- "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
- "--consumerd-err-sock", consumer_data->err_unix_sock_path,
- NULL);
- if (consumerd64_libdir[0] != '\0') {
- free(tmpnew);
- }
- if (ret) {
- goto error;
- }
- break;
- }
- case LTTNG_CONSUMER32_UST:
- {
- char *tmpnew = NULL;
-
- if (consumerd32_libdir[0] != '\0') {
- char *tmp;
- size_t tmplen;
-
- tmp = getenv("LD_LIBRARY_PATH");
- if (!tmp) {
- tmp = "";
- }
- tmplen = strlen("LD_LIBRARY_PATH=")
- + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
- tmpnew = zmalloc(tmplen + 1 /* \0 */);
- if (!tmpnew) {
- ret = -ENOMEM;
- goto error;
- }
- strcpy(tmpnew, "LD_LIBRARY_PATH=");
- strcat(tmpnew, consumerd32_libdir);
- if (tmp[0] != '\0') {
- strcat(tmpnew, ":");
- strcat(tmpnew, tmp);
- }
- ret = putenv(tmpnew);
- if (ret) {
- ret = -errno;
- goto error;
- }
- }
- DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
- ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
- "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
- "--consumerd-err-sock", consumer_data->err_unix_sock_path,
- NULL);
- if (consumerd32_libdir[0] != '\0') {
- free(tmpnew);
- }
- if (ret) {
- goto error;
- }
- break;
- }
- default:
- PERROR("unknown consumer type");
- exit(EXIT_FAILURE);
- }
- if (errno != 0) {
- PERROR("kernel start consumer exec");
- }
- exit(EXIT_FAILURE);
- } else if (pid > 0) {
- ret = pid;
- } else {
- PERROR("start consumer fork");
- ret = -errno;
- }
-error:
- return ret;
-}
-
-/*
- * Spawn the consumerd daemon and session daemon thread.
- */
-static int start_consumerd(struct consumer_data *consumer_data)
-{
- int ret;
-
- pthread_mutex_lock(&consumer_data->pid_mutex);
- if (consumer_data->pid != 0) {
- pthread_mutex_unlock(&consumer_data->pid_mutex);
- goto end;
- }
-
- ret = spawn_consumerd(consumer_data);
- if (ret < 0) {
- ERR("Spawning consumerd failed");
- pthread_mutex_unlock(&consumer_data->pid_mutex);
- goto error;
- }
-
- /* Setting up the consumer_data pid */
- consumer_data->pid = ret;
- DBG2("Consumer pid %d", consumer_data->pid);
- pthread_mutex_unlock(&consumer_data->pid_mutex);
-
- DBG2("Spawning consumer control thread");
- ret = spawn_consumer_thread(consumer_data);
- if (ret < 0) {
- ERR("Fatal error spawning consumer control thread");
- goto error;
- }
-
-end:
- return 0;
-
-error:
- return ret;
-}
-
-/*
- * Check version of the lttng-modules.
- */
-static int validate_lttng_modules_version(void)
-{
- return kernel_validate_version(kernel_tracer_fd);
-}
-
-/*
- * Setup necessary data for kernel tracer action.
- */
-static int init_kernel_tracer(void)
-{
- int ret;
-
- /* Modprobe lttng kernel modules */
- ret = modprobe_lttng_control();
- if (ret < 0) {
- goto error;
- }
-
- /* Open debugfs lttng */
- kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
- if (kernel_tracer_fd < 0) {
- DBG("Failed to open %s", module_proc_lttng);
- ret = -1;
- goto error_open;
- }
-
- /* Validate kernel version */
- ret = validate_lttng_modules_version();
- if (ret < 0) {
- goto error_version;
- }
-
- ret = modprobe_lttng_data();
- if (ret < 0) {
- goto error_modules;
- }
-
- DBG("Kernel tracer fd %d", kernel_tracer_fd);
- return 0;
-
-error_version:
- modprobe_remove_lttng_control();
- ret = close(kernel_tracer_fd);
- if (ret) {
- PERROR("close");
- }
- kernel_tracer_fd = -1;
- return LTTCOMM_KERN_VERSION;
-
-error_modules:
- ret = close(kernel_tracer_fd);
- if (ret) {
- PERROR("close");
- }
-
-error_open:
- modprobe_remove_lttng_control();
-
-error:
- WARN("No kernel tracer available");
- kernel_tracer_fd = -1;
- if (!is_root) {
- return LTTCOMM_NEED_ROOT_SESSIOND;
- } else {
- return LTTCOMM_KERN_NA;
- }
-}
-
-/*
- * Init tracing by creating trace directory and sending fds kernel consumer.
- */
-static int init_kernel_tracing(struct ltt_kernel_session *session)
-{
- int ret = 0;
-
- if (session->consumer_fds_sent == 0) {
- /*
- * Assign default kernel consumer socket if no consumer assigned to the
- * kernel session. At this point, it's NOT supposed to be -1 but this is
- * an extra security check.
- */
- if (session->consumer_fd < 0) {
- session->consumer_fd = kconsumer_data.cmd_sock;
- }
-
- ret = kernel_consumer_send_session(&kconsumer_data, session);
- if (ret < 0) {
- ret = LTTCOMM_KERN_CONSUMER_FAIL;
- goto error;
- }
-
- session->consumer_fds_sent = 1;
- }
-
-error:
- return ret;
-}
-
-/*
- * Create an UST session and add it to the session ust list.
- */
-static int create_ust_session(struct ltt_session *session,
- struct lttng_domain *domain)
-{
- struct ltt_ust_session *lus = NULL;
- int ret;
-
- switch (domain->type) {
- case LTTNG_DOMAIN_UST:
- break;
- default:
- ret = LTTCOMM_UNKNOWN_DOMAIN;
- goto error;
- }
-
- DBG("Creating UST session");
-
- lus = trace_ust_create_session(session->path, session->id, domain);
- if (lus == NULL) {
- ret = LTTCOMM_UST_SESS_FAIL;
- goto error;
- }
-
- ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
- session->uid, session->gid);
- if (ret < 0) {
- if (ret != -EEXIST) {
- ERR("Trace directory creation error");
- ret = LTTCOMM_UST_SESS_FAIL;
- goto error;
- }
- }
-
- /* The domain type dictate different actions on session creation */
- switch (domain->type) {
- case LTTNG_DOMAIN_UST:
- /* No ustctl for the global UST domain */
- break;
- default:
- ERR("Unknown UST domain on create session %d", domain->type);
- goto error;
- }
- lus->uid = session->uid;
- lus->gid = session->gid;
- session->ust_session = lus;
-
- return LTTCOMM_OK;
-
-error:
- free(lus);
- return ret;
-}
-
-/*
- * Create a kernel tracer session then create the default channel.
- */
-static int create_kernel_session(struct ltt_session *session)
-{
- int ret;
-
- DBG("Creating kernel session");
-
- ret = kernel_create_session(session, kernel_tracer_fd);
- if (ret < 0) {
- ret = LTTCOMM_KERN_SESS_FAIL;
- goto error;
- }
-
- /* Set kernel consumer socket fd */
- if (kconsumer_data.cmd_sock >= 0) {
- session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
- }
-
- ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
- S_IRWXU | S_IRWXG, session->uid, session->gid);
- if (ret < 0) {
- if (ret != -EEXIST) {
- ERR("Trace directory creation error");
- goto error;
- }
- }
- session->kernel_session->uid = session->uid;
- session->kernel_session->gid = session->gid;
-
-error:
- return ret;
-}
-
-/*
- * Check if the UID or GID match the session. Root user has access to all
- * sessions.
- */
-static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
-{
- if (uid != session->uid && gid != session->gid && uid != 0) {
- return 0;
- } else {
- return 1;
- }
-}
-
-static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
-{
- unsigned int i = 0;
- struct ltt_session *session;
-
- DBG("Counting number of available session for UID %d GID %d",
- uid, gid);
- cds_list_for_each_entry(session, &session_list_ptr->head, list) {
- /*
- * Only list the sessions the user can control.
- */
- if (!session_access_ok(session, uid, gid)) {
- continue;
- }
- i++;
- }
- return i;
-}
-
-/*
- * Using the session list, filled a lttng_session array to send back to the
- * client for session listing.
- *
- * The session list lock MUST be acquired before calling this function. Use
- * session_lock_list() and session_unlock_list().
- */
-static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
- gid_t gid)
-{
- unsigned int i = 0;
- struct ltt_session *session;
-
- DBG("Getting all available session for UID %d GID %d",
- uid, gid);
- /*
- * Iterate over session list and append data after the control struct in
- * the buffer.
- */
- cds_list_for_each_entry(session, &session_list_ptr->head, list) {
- /*
- * Only list the sessions the user can control.
- */
- if (!session_access_ok(session, uid, gid)) {
- continue;
- }
- strncpy(sessions[i].path, session->path, PATH_MAX);
- sessions[i].path[PATH_MAX - 1] = '\0';
- strncpy(sessions[i].name, session->name, NAME_MAX);
- sessions[i].name[NAME_MAX - 1] = '\0';
- sessions[i].enabled = session->enabled;
- i++;
- }
-}
-
-/*
- * Fill lttng_channel array of all channels.
- */
-static void list_lttng_channels(int domain, struct ltt_session *session,
- struct lttng_channel *channels)
-{
- int i = 0;
- struct ltt_kernel_channel *kchan;
-
- DBG("Listing channels for session %s", session->name);
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- /* Kernel channels */
- if (session->kernel_session != NULL) {
- cds_list_for_each_entry(kchan,
- &session->kernel_session->channel_list.head, list) {
- /* Copy lttng_channel struct to array */
- memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
- channels[i].enabled = kchan->enabled;
- i++;
- }
- }
- break;
- case LTTNG_DOMAIN_UST:
- {
- struct lttng_ht_iter iter;
- struct ltt_ust_channel *uchan;
-
- cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
- &iter.iter, uchan, node.node) {
- strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
- channels[i].attr.overwrite = uchan->attr.overwrite;
- channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
- channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
- channels[i].attr.switch_timer_interval =
- uchan->attr.switch_timer_interval;
- channels[i].attr.read_timer_interval =
- uchan->attr.read_timer_interval;
- channels[i].enabled = uchan->enabled;
- switch (uchan->attr.output) {
- case LTTNG_UST_MMAP:
- default:
- channels[i].attr.output = LTTNG_EVENT_MMAP;
- break;
- }
- i++;
- }
- break;
- }
- default:
- break;
- }
-}
-
-/*
- * Create a list of ust global domain events.
- */
-static int list_lttng_ust_global_events(char *channel_name,
- struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
-{
- int i = 0, ret = 0;
- unsigned int nb_event = 0;
- struct lttng_ht_iter iter;
- struct lttng_ht_node_str *node;
- struct ltt_ust_channel *uchan;
- struct ltt_ust_event *uevent;
- struct lttng_event *tmp;
-
- DBG("Listing UST global events for channel %s", channel_name);
-
- rcu_read_lock();
-
- lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
- node = lttng_ht_iter_get_node_str(&iter);
- if (node == NULL) {
- ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
- goto error;
- }
-
- uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
-
- nb_event += lttng_ht_get_count(uchan->events);
-
- if (nb_event == 0) {
- ret = nb_event;
- goto error;
- }
-
- DBG3("Listing UST global %d events", nb_event);
-
- tmp = zmalloc(nb_event * sizeof(struct lttng_event));
- if (tmp == NULL) {
- ret = -LTTCOMM_FATAL;
- goto error;
- }
-
- cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
- strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
- tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
- tmp[i].enabled = uevent->enabled;
- switch (uevent->attr.instrumentation) {
- case LTTNG_UST_TRACEPOINT:
- tmp[i].type = LTTNG_EVENT_TRACEPOINT;
- break;
- case LTTNG_UST_PROBE:
- tmp[i].type = LTTNG_EVENT_PROBE;
- break;
- case LTTNG_UST_FUNCTION:
- tmp[i].type = LTTNG_EVENT_FUNCTION;
- break;
- }
- tmp[i].loglevel = uevent->attr.loglevel;
- switch (uevent->attr.loglevel_type) {
- case LTTNG_UST_LOGLEVEL_ALL:
- tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
- break;
- case LTTNG_UST_LOGLEVEL_RANGE:
- tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
- break;
- case LTTNG_UST_LOGLEVEL_SINGLE:
- tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
- break;
- }
- i++;
- }
-
- ret = nb_event;
- *events = tmp;
-
-error:
- rcu_read_unlock();
- return ret;
-}
-
-/*
- * Fill lttng_event array of all kernel events in the channel.
- */
-static int list_lttng_kernel_events(char *channel_name,
- struct ltt_kernel_session *kernel_session, struct lttng_event **events)
-{
- int i = 0, ret;
- unsigned int nb_event;
- struct ltt_kernel_event *event;
- struct ltt_kernel_channel *kchan;
-
- kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
- if (kchan == NULL) {
- ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
- goto error;
- }
-
- nb_event = kchan->event_count;
-
- DBG("Listing events for channel %s", kchan->channel->name);
-
- if (nb_event == 0) {
- ret = nb_event;
- goto error;
- }
-
- *events = zmalloc(nb_event * sizeof(struct lttng_event));
- if (*events == NULL) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
-
- /* Kernel channels */
- cds_list_for_each_entry(event, &kchan->events_list.head , list) {
- strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
- (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
- (*events)[i].enabled = event->enabled;
- switch (event->event->instrumentation) {
- case LTTNG_KERNEL_TRACEPOINT:
- (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
- break;
- case LTTNG_KERNEL_KPROBE:
- case LTTNG_KERNEL_KRETPROBE:
- (*events)[i].type = LTTNG_EVENT_PROBE;
- memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
- sizeof(struct lttng_kernel_kprobe));
- break;
- case LTTNG_KERNEL_FUNCTION:
- (*events)[i].type = LTTNG_EVENT_FUNCTION;
- memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
- sizeof(struct lttng_kernel_function));
- break;
- case LTTNG_KERNEL_NOOP:
- (*events)[i].type = LTTNG_EVENT_NOOP;
- break;
- case LTTNG_KERNEL_SYSCALL:
- (*events)[i].type = LTTNG_EVENT_SYSCALL;
- break;
- case LTTNG_KERNEL_ALL:
- assert(0);
- break;
- }
- i++;
- }
-
- return nb_event;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
- */
-static int cmd_disable_channel(struct ltt_session *session,
- int domain, char *channel_name)
-{
- int ret;
- struct ltt_ust_session *usess;
-
- usess = session->ust_session;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- ret = channel_kernel_disable(session->kernel_session,
- channel_name);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- break;
- }
- case LTTNG_DOMAIN_UST:
- {
- struct ltt_ust_channel *uchan;
- struct lttng_ht *chan_ht;
-
- chan_ht = usess->domain_global.channels;
-
- uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
- if (uchan == NULL) {
- ret = LTTCOMM_UST_CHAN_NOT_FOUND;
- goto error;
- }
-
- ret = channel_ust_disable(usess, domain, uchan);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
-#endif
- default:
- ret = LTTCOMM_UNKNOWN_DOMAIN;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
- */
-static int cmd_enable_channel(struct ltt_session *session,
- int domain, struct lttng_channel *attr)
-{
- int ret;
- struct ltt_ust_session *usess = session->ust_session;
- struct lttng_ht *chan_ht;
-
- DBG("Enabling channel %s for session %s", attr->name, session->name);
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- struct ltt_kernel_channel *kchan;
-
- kchan = trace_kernel_get_channel_by_name(attr->name,
- session->kernel_session);
- if (kchan == NULL) {
- ret = channel_kernel_create(session->kernel_session,
- attr, kernel_poll_pipe[1]);
- } else {
- ret = channel_kernel_enable(session->kernel_session, kchan);
- }
-
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- break;
- }
- case LTTNG_DOMAIN_UST:
- {
- struct ltt_ust_channel *uchan;
-
- chan_ht = usess->domain_global.channels;
-
- uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
- if (uchan == NULL) {
- ret = channel_ust_create(usess, domain, attr);
- } else {
- ret = channel_ust_enable(usess, domain, uchan);
- }
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
-#endif
- default:
- ret = LTTCOMM_UNKNOWN_DOMAIN;
- goto error;
- }
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_DISABLE_EVENT processed by the client thread.
- */
-static int cmd_disable_event(struct ltt_session *session, int domain,
- char *channel_name, char *event_name)
-{
- int ret;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- struct ltt_kernel_channel *kchan;
- struct ltt_kernel_session *ksess;
-
- ksess = session->kernel_session;
-
- kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
- if (kchan == NULL) {
- ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
- goto error;
- }
-
- ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- break;
- }
- case LTTNG_DOMAIN_UST:
- {
- struct ltt_ust_channel *uchan;
- struct ltt_ust_session *usess;
-
- usess = session->ust_session;
-
- uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
- channel_name);
- if (uchan == NULL) {
- ret = LTTCOMM_UST_CHAN_NOT_FOUND;
- goto error;
- }
-
- ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- DBG3("Disable UST event %s in channel %s completed", event_name,
- channel_name);
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
-#endif
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
- */
-static int cmd_disable_event_all(struct ltt_session *session, int domain,
- char *channel_name)
-{
- int ret;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- struct ltt_kernel_session *ksess;
- struct ltt_kernel_channel *kchan;
-
- ksess = session->kernel_session;
-
- kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
- if (kchan == NULL) {
- ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
- goto error;
- }
-
- ret = event_kernel_disable_all(ksess, kchan);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- break;
- }
- case LTTNG_DOMAIN_UST:
- {
- struct ltt_ust_session *usess;
- struct ltt_ust_channel *uchan;
-
- usess = session->ust_session;
-
- uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
- channel_name);
- if (uchan == NULL) {
- ret = LTTCOMM_UST_CHAN_NOT_FOUND;
- goto error;
- }
-
- ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
- if (ret != 0) {
- goto error;
- }
-
- DBG3("Disable all UST events in channel %s completed", channel_name);
-
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
-#endif
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_ADD_CONTEXT processed by the client thread.
- */
-static int cmd_add_context(struct ltt_session *session, int domain,
- char *channel_name, char *event_name, struct lttng_event_context *ctx)
-{
- int ret;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- /* Add kernel context to kernel tracer */
- ret = context_kernel_add(session->kernel_session, ctx,
- event_name, channel_name);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
- break;
- case LTTNG_DOMAIN_UST:
- {
- struct ltt_ust_session *usess = session->ust_session;
-
- ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
-#endif
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_ENABLE_EVENT processed by the client thread.
- */
-static int cmd_enable_event(struct ltt_session *session, int domain,
- char *channel_name, struct lttng_event *event)
-{
- int ret;
- struct lttng_channel *attr;
- struct ltt_ust_session *usess = session->ust_session;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- struct ltt_kernel_channel *kchan;
-
- kchan = trace_kernel_get_channel_by_name(channel_name,
- session->kernel_session);
- if (kchan == NULL) {
- attr = channel_new_default_attr(domain);
- if (attr == NULL) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
- snprintf(attr->name, NAME_MAX, "%s", channel_name);
-
- /* This call will notify the kernel thread */
- ret = channel_kernel_create(session->kernel_session,
- attr, kernel_poll_pipe[1]);
- if (ret != LTTCOMM_OK) {
- free(attr);
- goto error;
- }
- free(attr);
- }
-
- /* Get the newly created kernel channel pointer */
- kchan = trace_kernel_get_channel_by_name(channel_name,
- session->kernel_session);
- if (kchan == NULL) {
- /* This sould not happen... */
- ret = LTTCOMM_FATAL;
- goto error;
- }
-
- ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
- event);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- break;
- }
- case LTTNG_DOMAIN_UST:
- {
- struct lttng_channel *attr;
- struct ltt_ust_channel *uchan;
-
- /* Get channel from global UST domain */
- uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
- channel_name);
- if (uchan == NULL) {
- /* Create default channel */
- attr = channel_new_default_attr(domain);
- if (attr == NULL) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
- snprintf(attr->name, NAME_MAX, "%s", channel_name);
- attr->name[NAME_MAX - 1] = '\0';
-
- ret = channel_ust_create(usess, domain, attr);
- if (ret != LTTCOMM_OK) {
- free(attr);
- goto error;
- }
- free(attr);
-
- /* Get the newly created channel reference back */
- uchan = trace_ust_find_channel_by_name(
- usess->domain_global.channels, channel_name);
- if (uchan == NULL) {
- /* Something is really wrong */
- ret = LTTCOMM_FATAL;
- goto error;
- }
- }
-
- /* At this point, the session and channel exist on the tracer */
- ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
-#endif
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
- */
-static int cmd_enable_event_all(struct ltt_session *session, int domain,
- char *channel_name, int event_type)
-{
- int ret;
- struct ltt_kernel_channel *kchan;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- kchan = trace_kernel_get_channel_by_name(channel_name,
- session->kernel_session);
- if (kchan == NULL) {
- /* This call will notify the kernel thread */
- ret = channel_kernel_create(session->kernel_session, NULL,
- kernel_poll_pipe[1]);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- /* Get the newly created kernel channel pointer */
- kchan = trace_kernel_get_channel_by_name(channel_name,
- session->kernel_session);
- if (kchan == NULL) {
- /* This sould not happen... */
- ret = LTTCOMM_FATAL;
- goto error;
- }
-
- }
-
- switch (event_type) {
- case LTTNG_EVENT_SYSCALL:
- ret = event_kernel_enable_all_syscalls(session->kernel_session,
- kchan, kernel_tracer_fd);
- break;
- case LTTNG_EVENT_TRACEPOINT:
- /*
- * This call enables all LTTNG_KERNEL_TRACEPOINTS and
- * events already registered to the channel.
- */
- ret = event_kernel_enable_all_tracepoints(session->kernel_session,
- kchan, kernel_tracer_fd);
- break;
- case LTTNG_EVENT_ALL:
- /* Enable syscalls and tracepoints */
- ret = event_kernel_enable_all(session->kernel_session,
- kchan, kernel_tracer_fd);
- break;
- default:
- ret = LTTCOMM_KERN_ENABLE_FAIL;
- goto error;
- }
-
- /* Manage return value */
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- break;
- case LTTNG_DOMAIN_UST:
- {
- struct lttng_channel *attr;
- struct ltt_ust_channel *uchan;
- struct ltt_ust_session *usess = session->ust_session;
-
- /* Get channel from global UST domain */
- uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
- channel_name);
- if (uchan == NULL) {
- /* Create default channel */
- attr = channel_new_default_attr(domain);
- if (attr == NULL) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
- snprintf(attr->name, NAME_MAX, "%s", channel_name);
- attr->name[NAME_MAX - 1] = '\0';
-
- /* Use the internal command enable channel */
- ret = channel_ust_create(usess, domain, attr);
- if (ret != LTTCOMM_OK) {
- free(attr);
- goto error;
- }
- free(attr);
-
- /* Get the newly created channel reference back */
- uchan = trace_ust_find_channel_by_name(
- usess->domain_global.channels, channel_name);
- if (uchan == NULL) {
- /* Something is really wrong */
- ret = LTTCOMM_FATAL;
- goto error;
- }
- }
-
- /* At this point, the session and channel exist on the tracer */
-
- switch (event_type) {
- case LTTNG_EVENT_ALL:
- case LTTNG_EVENT_TRACEPOINT:
- ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
- break;
- default:
- ret = LTTCOMM_UST_ENABLE_FAIL;
- goto error;
- }
-
- /* Manage return value */
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
-#endif
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
- */
-static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
-{
- int ret;
- ssize_t nb_events = 0;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- nb_events = kernel_list_events(kernel_tracer_fd, events);
- if (nb_events < 0) {
- ret = LTTCOMM_KERN_LIST_FAIL;
- goto error;
- }
- break;
- case LTTNG_DOMAIN_UST:
- nb_events = ust_app_list_events(events);
- if (nb_events < 0) {
- ret = LTTCOMM_UST_LIST_FAIL;
- goto error;
- }
- break;
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- return nb_events;
-
-error:
- /* Return negative value to differentiate return code */
- return -ret;
-}
-
-/*
- * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
- */
-static ssize_t cmd_list_tracepoint_fields(int domain,
- struct lttng_event_field **fields)
-{
- int ret;
- ssize_t nb_fields = 0;
-
- switch (domain) {
- case LTTNG_DOMAIN_UST:
- nb_fields = ust_app_list_event_fields(fields);
- if (nb_fields < 0) {
- ret = LTTCOMM_UST_LIST_FAIL;
- goto error;
- }
- break;
- case LTTNG_DOMAIN_KERNEL:
- default: /* fall-through */
- ret = LTTCOMM_UND;
- goto error;
- }
-
- return nb_fields;
-
-error:
- /* Return negative value to differentiate return code */
- return -ret;
-}
-
-/*
- * Command LTTNG_START_TRACE processed by the client thread.
- */
-static int cmd_start_trace(struct ltt_session *session)
-{
- int ret;
- struct ltt_kernel_session *ksession;
- struct ltt_ust_session *usess;
-
- /* Short cut */
- ksession = session->kernel_session;
- usess = session->ust_session;
-
- if (session->enabled) {
- /* Already started. */
- ret = LTTCOMM_TRACE_ALREADY_STARTED;
- goto error;
- }
-
- session->enabled = 1;
-
- /* Kernel tracing */
- if (ksession != NULL) {
- struct ltt_kernel_channel *kchan;
-
- /* Open kernel metadata */
- if (ksession->metadata == NULL) {
- ret = kernel_open_metadata(ksession, ksession->trace_path);
- if (ret < 0) {
- ret = LTTCOMM_KERN_META_FAIL;
- goto error;
- }
- }
-
- /* Open kernel metadata stream */
- if (ksession->metadata_stream_fd < 0) {
- ret = kernel_open_metadata_stream(ksession);
- if (ret < 0) {
- ERR("Kernel create metadata stream failed");
- ret = LTTCOMM_KERN_STREAM_FAIL;
- goto error;
- }
- }
-
- /* For each channel */
- cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
- if (kchan->stream_count == 0) {
- ret = kernel_open_channel_stream(kchan);
- if (ret < 0) {
- ret = LTTCOMM_KERN_STREAM_FAIL;
- goto error;
- }
- /* Update the stream global counter */
- ksession->stream_count_global += ret;
- }
- }
-
- /* Setup kernel consumer socket and send fds to it */
- ret = init_kernel_tracing(ksession);
- if (ret < 0) {
- ret = LTTCOMM_KERN_START_FAIL;
- goto error;
- }
-
- /* This start the kernel tracing */
- ret = kernel_start_session(ksession);
- if (ret < 0) {
- ret = LTTCOMM_KERN_START_FAIL;
- goto error;
- }
-
- /* Quiescent wait after starting trace */
- kernel_wait_quiescent(kernel_tracer_fd);
- }
-
- /* Flag session that trace should start automatically */
- if (usess) {
- usess->start_trace = 1;
-
- ret = ust_app_start_trace_all(usess);
- if (ret < 0) {
- ret = LTTCOMM_UST_START_FAIL;
- goto error;
- }
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_STOP_TRACE processed by the client thread.
- */
-static int cmd_stop_trace(struct ltt_session *session)
-{
- int ret;
- struct ltt_kernel_channel *kchan;
- struct ltt_kernel_session *ksession;
- struct ltt_ust_session *usess;
-
- /* Short cut */
- ksession = session->kernel_session;
- usess = session->ust_session;
-
- if (!session->enabled) {
- ret = LTTCOMM_TRACE_ALREADY_STOPPED;
- goto error;
- }
-
- session->enabled = 0;
-
- /* Kernel tracer */
- if (ksession != NULL) {
- DBG("Stop kernel tracing");
-
- /* Flush all buffers before stopping */
- ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
- if (ret < 0) {
- ERR("Kernel metadata flush failed");
- }
-
- cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
- ret = kernel_flush_buffer(kchan);
- if (ret < 0) {
- ERR("Kernel flush buffer error");
- }
- }
-
- ret = kernel_stop_session(ksession);
- if (ret < 0) {
- ret = LTTCOMM_KERN_STOP_FAIL;
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- }
-
- if (usess) {
- usess->start_trace = 0;
-
- ret = ust_app_stop_trace_all(usess);
- if (ret < 0) {
- ret = LTTCOMM_UST_STOP_FAIL;
- goto error;
- }
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_CREATE_SESSION processed by the client thread.
- */
-static int cmd_create_session(char *name, char *path, lttng_sock_cred *creds)
-{
- int ret;
-
- ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds),
- LTTNG_SOCK_GET_GID_CRED(creds));
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_DESTROY_SESSION processed by the client thread.
- */
-static int cmd_destroy_session(struct ltt_session *session, char *name)
-{
- int ret;
-
- /* Clean kernel session teardown */
- teardown_kernel_session(session);
- /* UST session teardown */
- teardown_ust_session(session);
-
- /*
- * Must notify the kernel thread here to update it's poll setin order
- * to remove the channel(s)' fd just destroyed.
- */
- ret = notify_thread_pipe(kernel_poll_pipe[1]);
- if (ret < 0) {
- PERROR("write kernel poll pipe");
- }
-
- ret = session_destroy(session);
-
- return ret;
-}
-
-/*
- * Command LTTNG_CALIBRATE processed by the client thread.
- */
-static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
-{
- int ret;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- struct lttng_kernel_calibrate kcalibrate;
-
- kcalibrate.type = calibrate->type;
- ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
- if (ret < 0) {
- ret = LTTCOMM_KERN_ENABLE_FAIL;
- goto error;
- }
- break;
- }
- case LTTNG_DOMAIN_UST:
- {
- struct lttng_ust_calibrate ucalibrate;
-
- ucalibrate.type = calibrate->type;
- ret = ust_app_calibrate_glb(&ucalibrate);
- if (ret < 0) {
- ret = LTTCOMM_UST_CALIBRATE_FAIL;
- goto error;
- }
- break;
- }
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
- */
-static int cmd_register_consumer(struct ltt_session *session, int domain,
- char *sock_path)
-{
- int ret, sock;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- /* Can't register a consumer if there is already one */
- if (session->kernel_session->consumer_fds_sent != 0) {
- ret = LTTCOMM_KERN_CONSUMER_FAIL;
- goto error;
- }
-
- sock = lttcomm_connect_unix_sock(sock_path);
- if (sock < 0) {
- ret = LTTCOMM_CONNECT_FAIL;
- goto error;
- }
-
- session->kernel_session->consumer_fd = sock;
- break;
- default:
- /* TODO: Userspace tracing */
- ret = LTTCOMM_UND;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_LIST_DOMAINS processed by the client thread.
- */
-static ssize_t cmd_list_domains(struct ltt_session *session,
- struct lttng_domain **domains)
-{
- int ret, index = 0;
- ssize_t nb_dom = 0;
-
- if (session->kernel_session != NULL) {
- DBG3("Listing domains found kernel domain");
- nb_dom++;
- }
-
- if (session->ust_session != NULL) {
- DBG3("Listing domains found UST global domain");
- nb_dom++;
- }
-
- *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
- if (*domains == NULL) {
- ret = -LTTCOMM_FATAL;
- goto error;
- }
-
- if (session->kernel_session != NULL) {
- (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
- index++;
- }
-
- if (session->ust_session != NULL) {
- (*domains)[index].type = LTTNG_DOMAIN_UST;
- index++;
- }
-
- return nb_dom;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_LIST_CHANNELS processed by the client thread.
- */
-static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
- struct lttng_channel **channels)
-{
- int ret;
- ssize_t nb_chan = 0;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- if (session->kernel_session != NULL) {
- nb_chan = session->kernel_session->channel_count;
- }
- DBG3("Number of kernel channels %zd", nb_chan);
- break;
- case LTTNG_DOMAIN_UST:
- if (session->ust_session != NULL) {
- nb_chan = lttng_ht_get_count(
- session->ust_session->domain_global.channels);
- }
- DBG3("Number of UST global channels %zd", nb_chan);
- break;
- default:
- *channels = NULL;
- ret = -LTTCOMM_UND;
- goto error;
- }
-
- if (nb_chan > 0) {
- *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
- if (*channels == NULL) {
- ret = -LTTCOMM_FATAL;
- goto error;
- }
-
- list_lttng_channels(domain, session, *channels);
- } else {
- *channels = NULL;
- }
-
- return nb_chan;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_LIST_EVENTS processed by the client thread.
- */
-static ssize_t cmd_list_events(int domain, struct ltt_session *session,
- char *channel_name, struct lttng_event **events)
-{
- int ret = 0;
- ssize_t nb_event = 0;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- if (session->kernel_session != NULL) {
- nb_event = list_lttng_kernel_events(channel_name,
- session->kernel_session, events);
- }
- break;
- case LTTNG_DOMAIN_UST:
- {
- if (session->ust_session != NULL) {
- nb_event = list_lttng_ust_global_events(channel_name,
- &session->ust_session->domain_global, events);
- }
- break;
- }
- default:
- ret = -LTTCOMM_UND;
- goto error;
- }
-
- ret = nb_event;
-
-error:
- return ret;
-}
-
-/*
- * 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 = LTTCOMM_OK;
- int need_tracing_session = 1;
- int need_domain;
-
- DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
-
- switch (cmd_ctx->lsm->cmd_type) {
- case LTTNG_CREATE_SESSION:
- case LTTNG_DESTROY_SESSION:
- case LTTNG_LIST_SESSIONS:
- case LTTNG_LIST_DOMAINS:
- case LTTNG_START_TRACE:
- case LTTNG_STOP_TRACE:
- need_domain = 0;
- break;
- default:
- need_domain = 1;
- }
-
- if (opt_no_kernel && need_domain
- && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
- if (!is_root) {
- ret = LTTCOMM_NEED_ROOT_SESSIOND;
- } else {
- ret = LTTCOMM_KERN_NA;
- }
- goto error;
- }
-
- /*
- * Check for command that don't needs to allocate a returned payload. We do
- * this here so we don't have to make the call for no payload at each
- * command.
- */
- switch(cmd_ctx->lsm->cmd_type) {
- case LTTNG_LIST_SESSIONS:
- case LTTNG_LIST_TRACEPOINTS:
- case LTTNG_LIST_TRACEPOINT_FIELDS:
- case LTTNG_LIST_DOMAINS:
- case LTTNG_LIST_CHANNELS:
- case LTTNG_LIST_EVENTS:
- break;
- default:
- /* Setup lttng message with no payload */
- ret = setup_lttng_msg(cmd_ctx, 0);
- if (ret < 0) {
- /* This label does not try to unlock the session */
- goto init_setup_error;
- }
- }
-
- /* Commands that DO NOT need a session. */
- switch (cmd_ctx->lsm->cmd_type) {
- case LTTNG_CREATE_SESSION:
- case LTTNG_CALIBRATE:
- case LTTNG_LIST_SESSIONS:
- case LTTNG_LIST_TRACEPOINTS:
- case LTTNG_LIST_TRACEPOINT_FIELDS:
- need_tracing_session = 0;
- break;
- default:
- DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
- /*
- * We keep the session list lock across _all_ commands
- * for now, because the per-session lock does not
- * handle teardown properly.
- */
- session_lock_list();
- cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
- if (cmd_ctx->session == NULL) {
- if (cmd_ctx->lsm->session.name != NULL) {
- ret = LTTCOMM_SESS_NOT_FOUND;
- } else {
- /* If no session name specified */
- ret = LTTCOMM_SELECT_SESS;
- }
- goto error;
- } else {
- /* Acquire lock for the session */
- session_lock(cmd_ctx->session);
- }
- break;
- }
-
- if (!need_domain) {
- goto skip_domain;
- }
- /*
- * Check domain type for specific "pre-action".
- */
- switch (cmd_ctx->lsm->domain.type) {
- case LTTNG_DOMAIN_KERNEL:
- if (!is_root) {
- ret = LTTCOMM_NEED_ROOT_SESSIOND;
- goto error;
- }
-
- /* Kernel tracer check */
- if (kernel_tracer_fd == -1) {
- /* Basically, load kernel tracer modules */
- ret = init_kernel_tracer();
- if (ret != 0) {
- goto error;
- }
- }
-
- /* Consumer is in an ERROR state. Report back to client */
- if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) {
- ret = LTTCOMM_NO_KERNCONSUMERD;
- goto error;
- }
-
- /* Need a session for kernel command */
- if (need_tracing_session) {
- if (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 */
- pthread_mutex_lock(&kconsumer_data.pid_mutex);
- if (kconsumer_data.pid == 0 &&
- cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
- pthread_mutex_unlock(&kconsumer_data.pid_mutex);
- ret = start_consumerd(&kconsumer_data);
- if (ret < 0) {
- ret = LTTCOMM_KERN_CONSUMER_FAIL;
- goto error;
- }
- uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED);
- } else {
- pthread_mutex_unlock(&kconsumer_data.pid_mutex);
- }
- }
-
- break;
- case LTTNG_DOMAIN_UST:
- {
- /* Consumer is in an ERROR state. Report back to client */
- if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
- ret = LTTCOMM_NO_USTCONSUMERD;
- goto error;
- }
-
- if (need_tracing_session) {
- if (cmd_ctx->session->ust_session == NULL) {
- ret = create_ust_session(cmd_ctx->session,
- &cmd_ctx->lsm->domain);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
- }
- /* Start the UST consumer daemons */
- /* 64-bit */
- pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
- if (consumerd64_bin[0] != '\0' &&
- ustconsumer64_data.pid == 0 &&
- cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
- pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
- ret = start_consumerd(&ustconsumer64_data);
- if (ret < 0) {
- ret = LTTCOMM_UST_CONSUMER64_FAIL;
- ust_consumerd64_fd = -EINVAL;
- goto error;
- }
-
- ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
- uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
- } else {
- pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
- }
- /* 32-bit */
- if (consumerd32_bin[0] != '\0' &&
- ustconsumer32_data.pid == 0 &&
- cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
- pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
- ret = start_consumerd(&ustconsumer32_data);
- if (ret < 0) {
- ret = LTTCOMM_UST_CONSUMER32_FAIL;
- ust_consumerd32_fd = -EINVAL;
- goto error;
- }
-
- ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
- uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
- } else {
- pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
- }
- }
- break;
- }
- default:
- break;
- }
-skip_domain:
-
- /* Validate consumer daemon state when start/stop trace command */
- if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE ||
- cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) {
- switch (cmd_ctx->lsm->domain.type) {
- case LTTNG_DOMAIN_UST:
- if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) {
- ret = LTTCOMM_NO_USTCONSUMERD;
- goto error;
- }
- break;
- case LTTNG_DOMAIN_KERNEL:
- if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) {
- ret = LTTCOMM_NO_KERNCONSUMERD;
- goto error;
- }
- break;
- }
- }
-
- /*
- * Check that the UID or GID match that of the tracing session.
- * The root user can interact with all sessions.
- */
- if (need_tracing_session) {
- if (!session_access_ok(cmd_ctx->session,
- LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
- LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) {
- ret = LTTCOMM_EPERM;
- goto error;
- }
- }
-
- /* Process by command type */
- switch (cmd_ctx->lsm->cmd_type) {
- case LTTNG_ADD_CONTEXT:
- {
- ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
- cmd_ctx->lsm->u.context.channel_name,
- cmd_ctx->lsm->u.context.event_name,
- &cmd_ctx->lsm->u.context.ctx);
- break;
- }
- case LTTNG_DISABLE_CHANNEL:
- {
- ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
- cmd_ctx->lsm->u.disable.channel_name);
- break;
- }
- case LTTNG_DISABLE_EVENT:
- {
- ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
- cmd_ctx->lsm->u.disable.channel_name,
- cmd_ctx->lsm->u.disable.name);
- break;
- }
- case LTTNG_DISABLE_ALL_EVENT:
- {
- DBG("Disabling all events");
-
- ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
- cmd_ctx->lsm->u.disable.channel_name);
- break;
- }
- case LTTNG_ENABLE_CHANNEL:
- {
- ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
- &cmd_ctx->lsm->u.channel.chan);
- break;
- }
- case LTTNG_ENABLE_EVENT:
- {
- ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
- cmd_ctx->lsm->u.enable.channel_name,
- &cmd_ctx->lsm->u.enable.event);
- break;
- }
- case LTTNG_ENABLE_ALL_EVENT:
- {
- DBG("Enabling all events");
-
- ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
- cmd_ctx->lsm->u.enable.channel_name,
- cmd_ctx->lsm->u.enable.event.type);
- break;
- }
- case LTTNG_LIST_TRACEPOINTS:
- {
- struct lttng_event *events;
- ssize_t nb_events;
-
- nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
- if (nb_events < 0) {
- ret = -nb_events;
- 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, sizeof(struct lttng_event) * nb_events);
- if (ret < 0) {
- free(events);
- goto setup_error;
- }
-
- /* Copy event list into message payload */
- memcpy(cmd_ctx->llm->payload, events,
- sizeof(struct lttng_event) * nb_events);
-
- free(events);
-
- ret = LTTCOMM_OK;
- break;
- }
- case LTTNG_LIST_TRACEPOINT_FIELDS:
- {
- struct lttng_event_field *fields;
- ssize_t nb_fields;
-
- nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, &fields);
- if (nb_fields < 0) {
- ret = -nb_fields;
- 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, sizeof(struct lttng_event_field) * nb_fields);
- if (ret < 0) {
- free(fields);
- goto setup_error;
- }
-
- /* Copy event list into message payload */
- memcpy(cmd_ctx->llm->payload, fields,
- sizeof(struct lttng_event_field) * nb_fields);
-
- free(fields);
-
- ret = LTTCOMM_OK;
- break;
- }
-
- case LTTNG_START_TRACE:
- {
- ret = cmd_start_trace(cmd_ctx->session);
- break;
- }
- case LTTNG_STOP_TRACE:
- {
- ret = cmd_stop_trace(cmd_ctx->session);
- break;
- }
- case LTTNG_CREATE_SESSION:
- {
- ret = cmd_create_session(cmd_ctx->lsm->session.name,
- cmd_ctx->lsm->session.path, &cmd_ctx->creds);
- break;
- }
- case LTTNG_DESTROY_SESSION:
- {
- ret = cmd_destroy_session(cmd_ctx->session,
- cmd_ctx->lsm->session.name);
- /*
- * Set session to NULL so we do not unlock it after
- * free.
- */
- cmd_ctx->session = NULL;
- break;
- }
- case LTTNG_LIST_DOMAINS:
- {
- ssize_t nb_dom;
- struct lttng_domain *domains;
-
- nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
- if (nb_dom < 0) {
- ret = -nb_dom;
- goto error;
- }
-
- ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
- if (ret < 0) {
- goto setup_error;
- }
-
- /* Copy event list into message payload */
- memcpy(cmd_ctx->llm->payload, domains,
- nb_dom * sizeof(struct lttng_domain));
-
- free(domains);
-
- ret = LTTCOMM_OK;
- break;
- }
- case LTTNG_LIST_CHANNELS:
- {
- int nb_chan;
- struct lttng_channel *channels;
-
- nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
- cmd_ctx->session, &channels);
- if (nb_chan < 0) {
- ret = -nb_chan;
- goto error;
- }
-
- ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
- if (ret < 0) {
- goto setup_error;
- }
-
- /* Copy event list into message payload */
- memcpy(cmd_ctx->llm->payload, channels,
- nb_chan * sizeof(struct lttng_channel));
-
- free(channels);
-
- ret = LTTCOMM_OK;
- break;
- }
- case LTTNG_LIST_EVENTS:
- {
- ssize_t nb_event;
- struct lttng_event *events = NULL;
-
- nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
- cmd_ctx->lsm->u.list.channel_name, &events);
- if (nb_event < 0) {
- ret = -nb_event;
- goto error;
- }
-
- ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
- if (ret < 0) {
- goto setup_error;
- }
-
- /* Copy event list into message payload */
- memcpy(cmd_ctx->llm->payload, events,
- nb_event * sizeof(struct lttng_event));
-
- free(events);
-
- ret = LTTCOMM_OK;
- break;
- }
- case LTTNG_LIST_SESSIONS:
- {
- unsigned int nr_sessions;
-
- session_lock_list();
- nr_sessions = lttng_sessions_count(
- LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
- LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
-
- ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
- if (ret < 0) {
- session_unlock_list();
- goto setup_error;
- }
-
- /* Filled the session array */
- list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
- LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
- LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
-
- session_unlock_list();
-
- ret = LTTCOMM_OK;
- break;
- }
- case LTTNG_CALIBRATE:
- {
- ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
- &cmd_ctx->lsm->u.calibrate);
- break;
- }
- case LTTNG_REGISTER_CONSUMER:
- {
- ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
- cmd_ctx->lsm->u.reg.path);
- break;
- }
- default:
- ret = LTTCOMM_UND;
- break;
- }
-
-error:
- if (cmd_ctx->llm == NULL) {
- DBG("Missing llm structure. Allocating one.");
- if (setup_lttng_msg(cmd_ctx, 0) < 0) {
- goto setup_error;
- }
- }
- /* Set return code */
- cmd_ctx->llm->ret_code = ret;
-setup_error:
- if (cmd_ctx->session) {
- session_unlock(cmd_ctx->session);
- }
- if (need_tracing_session) {
- session_unlock_list();
- }
-init_setup_error:
- return ret;
-}
-
-/*
- * This thread manage all clients request using the unix client socket for
- * communication.
- */
-static void *thread_manage_clients(void *data)
-{
- int sock = -1, ret, i, pollfd;
- uint32_t revents, nb_fd;
- struct command_ctx *cmd_ctx = NULL;
- struct lttng_poll_event events;
-
- DBG("[thread] Manage client started");
-
- rcu_register_thread();
-
- ret = lttcomm_listen_unix_sock(client_sock);
- if (ret < 0) {
- goto error;
- }
-
- /*
- * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
- * more will be added to this poll set.
- */
- ret = create_thread_poll_set(&events, 2);
- if (ret < 0) {
- goto error;
- }
-
- /* Add the application registration socket */
- ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
- if (ret < 0) {
- goto error;
- }
-
- /*
- * Notify parent pid that we are ready to accept command for client side.
- */
- if (opt_sig_parent) {
- kill(ppid, SIGUSR1);
- }
-
- while (1) {
- DBG("Accepting client command ...");
-
- nb_fd = LTTNG_POLL_GETNB(&events);
-
- /* Inifinite blocking call, waiting for transmission */
- restart:
- ret = lttng_poll_wait(&events, -1);
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- goto restart;
- }
- goto error;
- }
-
- for (i = 0; i < nb_fd; i++) {
- /* Fetch once the poll data */
- revents = LTTNG_POLL_GETEV(&events, i);
- pollfd = LTTNG_POLL_GETFD(&events, i);
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = check_thread_quit_pipe(pollfd, revents);
- if (ret) {
- goto error;
- }
-
- /* Event on the registration socket */
- if (pollfd == client_sock) {
- if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("Client socket poll error");
- goto error;
- }
- }
- }
-
- DBG("Wait for client response");
-
- sock = lttcomm_accept_unix_sock(client_sock);
- if (sock < 0) {
- goto error;
- }
-
- /* Set socket option for credentials retrieval */
- ret = lttcomm_setsockopt_creds_unix_sock(sock);
- if (ret < 0) {
- goto error;
- }
-
- /* Allocate context command to process the client request */
- cmd_ctx = zmalloc(sizeof(struct command_ctx));
- if (cmd_ctx == NULL) {
- PERROR("zmalloc cmd_ctx");
- goto error;
- }
-
- /* Allocate data buffer for reception */
- cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
- if (cmd_ctx->lsm == NULL) {
- PERROR("zmalloc cmd_ctx->lsm");
- goto error;
- }
-
- cmd_ctx->llm = NULL;
- cmd_ctx->session = NULL;
-
- /*
- * Data is received from the lttng client. The struct
- * lttcomm_session_msg (lsm) contains the command and data request of
- * the client.
- */
- DBG("Receiving data from client ...");
- ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
- sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
- if (ret <= 0) {
- DBG("Nothing recv() from client... continuing");
- ret = close(sock);
- if (ret) {
- PERROR("close");
- }
- sock = -1;
- clean_command_ctx(&cmd_ctx);
- continue;
- }
-
- // TODO: Validate cmd_ctx including sanity check for
- // security purpose.
-
- rcu_thread_online();
- /*
- * This function dispatch the work to the kernel or userspace tracer
- * libs and fill the lttcomm_lttng_msg data structure of all the needed
- * informations for the client. The command context struct contains
- * everything this function may needs.
- */
- ret = process_client_msg(cmd_ctx);
- rcu_thread_offline();
- if (ret < 0) {
- /*
- * TODO: Inform client somehow of the fatal error. At
- * this point, ret < 0 means that a zmalloc failed
- * (ENOMEM). Error detected but still accept command.
- */
- clean_command_ctx(&cmd_ctx);
- continue;
- }
-
- DBG("Sending response (size: %d, retcode: %s)",
- cmd_ctx->lttng_msg_size,
- lttng_strerror(-cmd_ctx->llm->ret_code));
- ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
- if (ret < 0) {
- ERR("Failed to send data back to client");
- }
-
- /* End of transmission */
- ret = close(sock);
- if (ret) {
- PERROR("close");
- }
- sock = -1;
-
- clean_command_ctx(&cmd_ctx);
- }
-
-error:
- DBG("Client thread dying");
- unlink(client_unix_sock_path);
- if (client_sock >= 0) {
- ret = close(client_sock);
- if (ret) {
- PERROR("close");
- }
- }
- if (sock >= 0) {
- ret = close(sock);
- if (ret) {
- PERROR("close");
- }
- }
-
- lttng_poll_clean(&events);
- clean_command_ctx(&cmd_ctx);
-
- rcu_unregister_thread();
- return NULL;
-}
-
-
-/*
- * usage function on stderr
- */
-static void usage(void)
-{
- fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
- fprintf(stderr, " -h, --help Display this usage.\n");
- fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
- fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
- fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
- fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
- fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
- fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
- fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
- fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
- fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
- fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
- fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
- fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
- fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
- fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
- fprintf(stderr, " -V, --version Show version number.\n");
- fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
- fprintf(stderr, " -q, --quiet No output at all.\n");
- fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
- fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
- fprintf(stderr, " --no-kernel Disable kernel tracer\n");
-}
-
-/*
- * daemon argument parsing
- */
-static int parse_args(int argc, char **argv)
-{
- int c;
-
- static struct option long_options[] = {
- { "client-sock", 1, 0, 'c' },
- { "apps-sock", 1, 0, 'a' },
- { "kconsumerd-cmd-sock", 1, 0, 'C' },
- { "kconsumerd-err-sock", 1, 0, 'E' },
- { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
- { "ustconsumerd32-err-sock", 1, 0, 'H' },
- { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
- { "ustconsumerd64-err-sock", 1, 0, 'F' },
- { "consumerd32-path", 1, 0, 'u' },
- { "consumerd32-libdir", 1, 0, 'U' },
- { "consumerd64-path", 1, 0, 't' },
- { "consumerd64-libdir", 1, 0, 'T' },
- { "daemonize", 0, 0, 'd' },
- { "sig-parent", 0, 0, 'S' },
- { "help", 0, 0, 'h' },
- { "group", 1, 0, 'g' },
- { "version", 0, 0, 'V' },
- { "quiet", 0, 0, 'q' },
- { "verbose", 0, 0, 'v' },
- { "verbose-consumer", 0, 0, 'Z' },
- { "no-kernel", 0, 0, 'N' },
- { NULL, 0, 0, 0 }
- };
-
- while (1) {
- int option_index = 0;
- c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
- long_options, &option_index);
- if (c == -1) {
- break;
- }
-
- switch (c) {
- case 0:
- fprintf(stderr, "option %s", long_options[option_index].name);
- if (optarg) {
- fprintf(stderr, " with arg %s\n", optarg);
- }
- break;
- case 'c':
- snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
- break;
- case 'a':
- snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
- break;
- case 'd':
- opt_daemon = 1;
- break;
- case 'g':
- opt_tracing_group = optarg;
- break;
- case 'h':
- usage();
- exit(EXIT_FAILURE);
- case 'V':
- fprintf(stdout, "%s\n", VERSION);
- exit(EXIT_SUCCESS);
- case 'S':
- opt_sig_parent = 1;
- break;
- case 'E':
- snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
- break;
- case 'C':
- snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
- break;
- case 'F':
- snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
- break;
- case 'D':
- snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
- break;
- case 'H':
- snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
- break;
- case 'G':
- snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
- break;
- case 'N':
- opt_no_kernel = 1;
- break;
- case 'q':
- lttng_opt_quiet = 1;
- break;
- case 'v':
- /* Verbose level can increase using multiple -v */
- lttng_opt_verbose += 1;
- break;
- case 'Z':
- opt_verbose_consumer += 1;
- break;
- case 'u':
- consumerd32_bin= optarg;
- break;
- case 'U':
- consumerd32_libdir = optarg;
- break;
- case 't':
- consumerd64_bin = optarg;
- break;
- case 'T':
- consumerd64_libdir = optarg;
- break;
- default:
- /* Unknown option or other error.
- * Error is printed by getopt, just return */
- return -1;
- }
- }
-
- return 0;
-}
-
-/*
- * Creates the two needed socket by the daemon.
- * apps_sock - The communication socket for all UST apps.
- * client_sock - The communication of the cli tool (lttng).
- */
-static int init_daemon_socket(void)
-{
- int ret = 0;
- mode_t old_umask;
-
- old_umask = umask(0);
-
- /* Create client tool unix socket */
- client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
- if (client_sock < 0) {
- ERR("Create unix sock failed: %s", client_unix_sock_path);
- ret = -1;
- goto end;
- }
-
- /* File permission MUST be 660 */
- ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
- if (ret < 0) {
- ERR("Set file permissions failed: %s", client_unix_sock_path);
- PERROR("chmod");
- goto end;
- }
-
- /* Create the application unix socket */
- apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
- if (apps_sock < 0) {
- ERR("Create unix sock failed: %s", apps_unix_sock_path);
- ret = -1;