+++ /dev/null
-/*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#define _LGPL_SOURCE
-#include <getopt.h>
-#include <grp.h>
-#include <limits.h>
-#include <paths.h>
-#include <pthread.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <inttypes.h>
-#include <sys/mman.h>
-#include <sys/mount.h>
-#include <sys/resource.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <urcu/uatomic.h>
-#include <unistd.h>
-#include <ctype.h>
-
-#include <common/common.h>
-#include <common/compat/socket.h>
-#include <common/compat/getenv.h>
-#include <common/defaults.h>
-#include <common/kernel-consumer/kernel-consumer.h>
-#include <common/futex.h>
-#include <common/relayd/relayd.h>
-#include <common/utils.h>
-#include <common/daemonize.h>
-#include <common/config/session-config.h>
-#include <common/dynamic-buffer.h>
-#include <lttng/event-internal.h>
-
-#include "lttng-sessiond.h"
-#include "buffer-registry.h"
-#include "channel.h"
-#include "cmd.h"
-#include "consumer.h"
-#include "context.h"
-#include "event.h"
-#include "kernel.h"
-#include "kernel-consumer.h"
-#include "modprobe.h"
-#include "shm.h"
-#include "ust-ctl.h"
-#include "ust-consumer.h"
-#include "utils.h"
-#include "fd-limit.h"
-#include "health-sessiond.h"
-#include "testpoint.h"
-#include "ust-thread.h"
-#include "agent-thread.h"
-#include "save.h"
-#include "load-session-thread.h"
-#include "notification-thread.h"
-#include "notification-thread-commands.h"
-#include "rotation-thread.h"
-#include "lttng-syscall.h"
-#include "agent.h"
-#include "ht-cleanup.h"
-#include "sessiond-config.h"
-#include "timer.h"
-#include "thread.h"
-#include "client.h"
-
-static const char *help_msg =
-#ifdef LTTNG_EMBED_HELP
-#include <lttng-sessiond.8.h>
-#else
-NULL
-#endif
-;
-
-const char *progname;
-static int lockfile_fd = -1;
-
-/* Set to 1 when a SIGUSR1 signal is received. */
-static int recv_child_signal;
-
-/* Command line options */
-static const struct option long_options[] = {
- { "client-sock", required_argument, 0, 'c' },
- { "apps-sock", required_argument, 0, 'a' },
- { "kconsumerd-cmd-sock", required_argument, 0, '\0' },
- { "kconsumerd-err-sock", required_argument, 0, '\0' },
- { "ustconsumerd32-cmd-sock", required_argument, 0, '\0' },
- { "ustconsumerd32-err-sock", required_argument, 0, '\0' },
- { "ustconsumerd64-cmd-sock", required_argument, 0, '\0' },
- { "ustconsumerd64-err-sock", required_argument, 0, '\0' },
- { "consumerd32-path", required_argument, 0, '\0' },
- { "consumerd32-libdir", required_argument, 0, '\0' },
- { "consumerd64-path", required_argument, 0, '\0' },
- { "consumerd64-libdir", required_argument, 0, '\0' },
- { "daemonize", no_argument, 0, 'd' },
- { "background", no_argument, 0, 'b' },
- { "sig-parent", no_argument, 0, 'S' },
- { "help", no_argument, 0, 'h' },
- { "group", required_argument, 0, 'g' },
- { "version", no_argument, 0, 'V' },
- { "quiet", no_argument, 0, 'q' },
- { "verbose", no_argument, 0, 'v' },
- { "verbose-consumer", no_argument, 0, '\0' },
- { "no-kernel", no_argument, 0, '\0' },
- { "pidfile", required_argument, 0, 'p' },
- { "agent-tcp-port", required_argument, 0, '\0' },
- { "config", required_argument, 0, 'f' },
- { "load", required_argument, 0, 'l' },
- { "kmod-probes", required_argument, 0, '\0' },
- { "extra-kmod-probes", required_argument, 0, '\0' },
- { NULL, 0, 0, 0 }
-};
-
-/* Command line options to ignore from configuration file */
-static const char *config_ignore_options[] = { "help", "version", "config" };
-
-/* Shared between threads */
-static int dispatch_thread_exit;
-
-static int apps_sock = -1;
-
-/*
- * This pipe is used to inform the thread managing application communication
- * that a command is queued and ready to be processed.
- */
-static int apps_cmd_pipe[2] = { -1, -1 };
-
-/* Pthread, Mutexes and Semaphores */
-static pthread_t apps_thread;
-static pthread_t apps_notify_thread;
-static pthread_t reg_apps_thread;
-static pthread_t kernel_thread;
-static pthread_t dispatch_thread;
-static pthread_t agent_reg_thread;
-static pthread_t load_session_thread;
-
-/*
- * UST registration command queue. This queue is tied with a futex and uses a N
- * wakers / 1 waiter implemented and detailed in futex.c/.h
- *
- * The thread_registration_apps and thread_dispatch_ust_registration uses this
- * queue along with the wait/wake scheme. The thread_manage_apps receives down
- * the line new application socket and monitors it for any I/O error or clean
- * close that triggers an unregistration of the application.
- */
-static struct ust_cmd_queue ust_cmd_queue;
-
-static const char *module_proc_lttng = "/proc/lttng";
-
-/* Load session thread information to operate. */
-static struct load_session_thread_data *load_info;
-
-/*
- * Section name to look for in the daemon configuration file.
- */
-static const char * const config_section_name = "sessiond";
-
-/* Am I root or not. Set to 1 if the daemon is running as root */
-static int is_root;
-
-/*
- * Stop all threads by closing the thread quit pipe.
- */
-static void stop_threads(void)
-{
- int ret;
-
- /* Stopping all threads */
- DBG("Terminating all threads");
- ret = sessiond_notify_quit_pipe();
- if (ret < 0) {
- ERR("write error on thread quit pipe");
- }
-
- /* Dispatch thread */
- CMM_STORE_SHARED(dispatch_thread_exit, 1);
- futex_nto1_wake(&ust_cmd_queue.futex);
-}
-
-/*
- * Close every consumer sockets.
- */
-static void close_consumer_sockets(void)
-{
- int ret;
-
- if (kconsumer_data.err_sock >= 0) {
- ret = close(kconsumer_data.err_sock);
- if (ret < 0) {
- PERROR("kernel consumer err_sock close");
- }
- }
- if (ustconsumer32_data.err_sock >= 0) {
- ret = close(ustconsumer32_data.err_sock);
- if (ret < 0) {
- PERROR("UST consumerd32 err_sock close");
- }
- }
- if (ustconsumer64_data.err_sock >= 0) {
- ret = close(ustconsumer64_data.err_sock);
- if (ret < 0) {
- PERROR("UST consumerd64 err_sock close");
- }
- }
- if (kconsumer_data.cmd_sock >= 0) {
- ret = close(kconsumer_data.cmd_sock);
- if (ret < 0) {
- PERROR("kernel consumer cmd_sock close");
- }
- }
- if (ustconsumer32_data.cmd_sock >= 0) {
- ret = close(ustconsumer32_data.cmd_sock);
- if (ret < 0) {
- PERROR("UST consumerd32 cmd_sock close");
- }
- }
- if (ustconsumer64_data.cmd_sock >= 0) {
- ret = close(ustconsumer64_data.cmd_sock);
- if (ret < 0) {
- PERROR("UST consumerd64 cmd_sock close");
- }
- }
- if (kconsumer_data.channel_monitor_pipe >= 0) {
- ret = close(kconsumer_data.channel_monitor_pipe);
- if (ret < 0) {
- PERROR("kernel consumer channel monitor pipe close");
- }
- }
- if (ustconsumer32_data.channel_monitor_pipe >= 0) {
- ret = close(ustconsumer32_data.channel_monitor_pipe);
- if (ret < 0) {
- PERROR("UST consumerd32 channel monitor pipe close");
- }
- }
- if (ustconsumer64_data.channel_monitor_pipe >= 0) {
- ret = close(ustconsumer64_data.channel_monitor_pipe);
- if (ret < 0) {
- PERROR("UST consumerd64 channel monitor pipe close");
- }
- }
-}
-
-/*
- * Wait on consumer process termination.
- *
- * Need to be called with the consumer data lock held or from a context
- * ensuring no concurrent access to data (e.g: cleanup).
- */
-static void wait_consumer(struct consumer_data *consumer_data)
-{
- pid_t ret;
- int status;
-
- if (consumer_data->pid <= 0) {
- return;
- }
-
- DBG("Waiting for complete teardown of consumerd (PID: %d)",
- consumer_data->pid);
- ret = waitpid(consumer_data->pid, &status, 0);
- if (ret == -1) {
- PERROR("consumerd waitpid pid: %d", consumer_data->pid)
- } else if (!WIFEXITED(status)) {
- ERR("consumerd termination with error: %d",
- WEXITSTATUS(ret));
- }
- consumer_data->pid = 0;
-}
-
-/*
- * Cleanup the session daemon's data structures.
- */
-static void sessiond_cleanup(void)
-{
- int ret;
- struct ltt_session_list *session_list = session_get_list();
-
- DBG("Cleanup sessiond");
-
- /*
- * Close the thread quit pipe. It has already done its job,
- * since we are now called.
- */
- sessiond_close_quit_pipe();
-
- ret = remove(config.pid_file_path.value);
- if (ret < 0) {
- PERROR("remove pidfile %s", config.pid_file_path.value);
- }
-
- DBG("Removing sessiond and consumerd content of directory %s",
- config.rundir.value);
-
- /* sessiond */
- DBG("Removing %s", config.pid_file_path.value);
- (void) unlink(config.pid_file_path.value);
-
- DBG("Removing %s", config.agent_port_file_path.value);
- (void) unlink(config.agent_port_file_path.value);
-
- /* kconsumerd */
- DBG("Removing %s", kconsumer_data.err_unix_sock_path);
- (void) unlink(kconsumer_data.err_unix_sock_path);
-
- DBG("Removing directory %s", config.kconsumerd_path.value);
- (void) rmdir(config.kconsumerd_path.value);
-
- /* ust consumerd 32 */
- DBG("Removing %s", config.consumerd32_err_unix_sock_path.value);
- (void) unlink(config.consumerd32_err_unix_sock_path.value);
-
- DBG("Removing directory %s", config.consumerd32_path.value);
- (void) rmdir(config.consumerd32_path.value);
-
- /* ust consumerd 64 */
- DBG("Removing %s", config.consumerd64_err_unix_sock_path.value);
- (void) unlink(config.consumerd64_err_unix_sock_path.value);
-
- DBG("Removing directory %s", config.consumerd64_path.value);
- (void) rmdir(config.consumerd64_path.value);
-
- pthread_mutex_destroy(&session_list->lock);
-
- wait_consumer(&kconsumer_data);
- wait_consumer(&ustconsumer64_data);
- wait_consumer(&ustconsumer32_data);
-
- DBG("Cleaning up all agent apps");
- agent_app_ht_clean();
-
- DBG("Closing all UST sockets");
- ust_app_clean_list();
- buffer_reg_destroy_registries();
-
- if (is_root && !config.no_kernel) {
- DBG2("Closing kernel fd");
- if (kernel_tracer_fd >= 0) {
- ret = close(kernel_tracer_fd);
- if (ret) {
- PERROR("close");
- }
- }
- DBG("Unloading kernel modules");
- modprobe_remove_lttng_all();
- free(syscall_table);
- }
-
- close_consumer_sockets();
-
- if (load_info) {
- load_session_destroy_data(load_info);
- free(load_info);
- }
-
- /*
- * We do NOT rmdir rundir because there are other processes
- * using it, for instance lttng-relayd, which can start in
- * parallel with this teardown.
- */
-}
-
-/*
- * Cleanup the daemon's option data structures.
- */
-static void sessiond_cleanup_options(void)
-{
- DBG("Cleaning up options");
-
- sessiond_config_fini(&config);
-
- run_as_destroy_worker();
-}
-
-/*
- * Notify UST applications using the shm mmap futex.
- */
-static int notify_ust_apps(int active)
-{
- char *wait_shm_mmap;
-
- DBG("Notifying applications of session daemon state: %d", active);
-
- /* See shm.c for this call implying mmap, shm and futex calls */
- wait_shm_mmap = shm_ust_get_mmap(config.wait_shm_path.value, is_root);
- if (wait_shm_mmap == NULL) {
- goto error;
- }
-
- /* Wake waiting process */
- futex_wait_update((int32_t *) wait_shm_mmap, active);
-
- /* Apps notified successfully */
- return 0;
-
-error:
- return -1;
-}
-
-/*
- * Update the kernel poll set of all channel fd available over all tracing
- * session. Add the wakeup pipe at the end of the set.
- */
-static int update_kernel_poll(struct lttng_poll_event *events)
-{
- int ret;
- struct ltt_kernel_channel *channel;
- struct ltt_session *session;
- const struct ltt_session_list *session_list = session_get_list();
-
- DBG("Updating kernel poll set");
-
- session_lock_list();
- cds_list_for_each_entry(session, &session_list->head, list) {
- if (!session_get(session)) {
- continue;
- }
- session_lock(session);
- if (session->kernel_session == NULL) {
- session_unlock(session);
- session_put(session);
- continue;
- }
-
- cds_list_for_each_entry(channel,
- &session->kernel_session->channel_list.head, list) {
- /* Add channel fd to the kernel poll set */
- ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
- if (ret < 0) {
- session_unlock(session);
- session_put(session);
- goto error;
- }
- DBG("Channel fd %d added to kernel set", channel->fd);
- }
- session_unlock(session);
- }
- session_unlock_list();
-
- return 0;
-
-error:
- session_unlock_list();
- return -1;
-}
-
-/*
- * Find the channel fd from 'fd' over all tracing session. When found, check
- * for new channel stream and send those stream fds to the kernel consumer.
- *
- * Useful for CPU hotplug feature.
- */
-static int update_kernel_stream(int fd)
-{
- int ret = 0;
- struct ltt_session *session;
- struct ltt_kernel_session *ksess;
- struct ltt_kernel_channel *channel;
- const struct ltt_session_list *session_list = session_get_list();
-
- DBG("Updating kernel streams for channel fd %d", fd);
-
- session_lock_list();
- cds_list_for_each_entry(session, &session_list->head, list) {
- if (!session_get(session)) {
- continue;
- }
- session_lock(session);
- if (session->kernel_session == NULL) {
- session_unlock(session);
- session_put(session);
- continue;
- }
- ksess = session->kernel_session;
-
- cds_list_for_each_entry(channel,
- &ksess->channel_list.head, list) {
- struct lttng_ht_iter iter;
- struct consumer_socket *socket;
-
- if (channel->fd != fd) {
- continue;
- }
- DBG("Channel found, updating kernel streams");
- ret = kernel_open_channel_stream(channel);
- if (ret < 0) {
- goto error;
- }
- /* Update the stream global counter */
- ksess->stream_count_global += ret;
-
- /*
- * Have we already sent fds to the consumer? If yes, it
- * means that tracing is started so it is safe to send
- * our updated stream fds.
- */
- if (ksess->consumer_fds_sent != 1
- || ksess->consumer == NULL) {
- ret = -1;
- goto error;
- }
-
- rcu_read_lock();
- cds_lfht_for_each_entry(ksess->consumer->socks->ht,
- &iter.iter, socket, node.node) {
- pthread_mutex_lock(socket->lock);
- ret = kernel_consumer_send_channel_streams(socket,
- channel, ksess,
- session->output_traces ? 1 : 0);
- pthread_mutex_unlock(socket->lock);
- if (ret < 0) {
- rcu_read_unlock();
- goto error;
- }
- }
- rcu_read_unlock();
- }
- session_unlock(session);
- session_put(session);
- }
- session_unlock_list();
- return ret;
-
-error:
- session_unlock(session);
- session_put(session);
- session_unlock_list();
- return ret;
-}
-
-/*
- * For each tracing session, update newly registered apps. The session list
- * lock MUST be acquired before calling this.
- */
-static void update_ust_app(int app_sock)
-{
- struct ltt_session *sess, *stmp;
- const struct ltt_session_list *session_list = session_get_list();
-
- /* Consumer is in an ERROR state. Stop any application update. */
- if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
- /* Stop the update process since the consumer is dead. */
- return;
- }
-
- /* For all tracing session(s) */
- cds_list_for_each_entry_safe(sess, stmp, &session_list->head, list) {
- struct ust_app *app;
-
- if (!session_get(sess)) {
- continue;
- }
- session_lock(sess);
- if (!sess->ust_session) {
- goto unlock_session;
- }
-
- rcu_read_lock();
- assert(app_sock >= 0);
- app = ust_app_find_by_sock(app_sock);
- if (app == NULL) {
- /*
- * Application can be unregistered before so
- * this is possible hence simply stopping the
- * update.
- */
- DBG3("UST app update failed to find app sock %d",
- app_sock);
- goto unlock_rcu;
- }
- ust_app_global_update(sess->ust_session, app);
- unlock_rcu:
- rcu_read_unlock();
- unlock_session:
- session_unlock(sess);
- session_put(sess);
- }
-}
-
-/*
- * This thread manage event coming from the kernel.
- *
- * Features supported in this thread:
- * -) CPU Hotplug
- */
-static void *thread_manage_kernel(void *data)
-{
- int ret, i, pollfd, update_poll_flag = 1, err = -1;
- uint32_t revents, nb_fd;
- char tmp;
- struct lttng_poll_event events;
-
- DBG("[thread] Thread manage kernel started");
-
- health_register(health_sessiond, HEALTH_SESSIOND_TYPE_KERNEL);
-
- /*
- * This first step of the while is to clean this structure which could free
- * non NULL pointers so initialize it before the loop.
- */
- lttng_poll_init(&events);
-
- if (testpoint(sessiond_thread_manage_kernel)) {
- goto error_testpoint;
- }
-
- health_code_update();
-
- if (testpoint(sessiond_thread_manage_kernel_before_loop)) {
- goto error_testpoint;
- }
-
- while (1) {
- health_code_update();
-
- if (update_poll_flag == 1) {
- /* Clean events object. We are about to populate it again. */
- lttng_poll_clean(&events);
-
- ret = sessiond_set_thread_pollset(&events, 2);
- if (ret < 0) {
- goto error_poll_create;
- }
-
- ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
- if (ret < 0) {
- goto error;
- }
-
- /* This will add the available kernel channel if any. */
- ret = update_kernel_poll(&events);
- if (ret < 0) {
- goto error;
- }
- update_poll_flag = 0;
- }
-
- DBG("Thread kernel polling");
-
- /* Poll infinite value of time */
- restart:
- health_poll_entry();
- ret = lttng_poll_wait(&events, -1);
- DBG("Thread kernel return from poll on %d fds",
- LTTNG_POLL_GETNB(&events));
- health_poll_exit();
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- goto restart;
- }
- goto error;
- } else if (ret == 0) {
- /* Should not happen since timeout is infinite */
- ERR("Return value of poll is 0 with an infinite timeout.\n"
- "This should not have happened! Continuing...");
- continue;
- }
-
- nb_fd = ret;
-
- for (i = 0; i < nb_fd; i++) {
- /* Fetch once the poll data */
- revents = LTTNG_POLL_GETEV(&events, i);
- pollfd = LTTNG_POLL_GETFD(&events, i);
-
- health_code_update();
-
- if (!revents) {
- /* No activity for this FD (poll implementation). */
- continue;
- }
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = sessiond_check_thread_quit_pipe(pollfd, revents);
- if (ret) {
- err = 0;
- goto exit;
- }
-
- /* Check for data on kernel pipe */
- if (revents & LPOLLIN) {
- if (pollfd == kernel_poll_pipe[0]) {
- (void) lttng_read(kernel_poll_pipe[0],
- &tmp, 1);
- /*
- * Ret value is useless here, if this pipe gets any actions an
- * update is required anyway.
- */
- update_poll_flag = 1;
- continue;
- } else {
- /*
- * New CPU detected by the kernel. Adding kernel stream to
- * kernel session and updating the kernel consumer
- */
- ret = update_kernel_stream(pollfd);
- if (ret < 0) {
- continue;
- }
- break;
- }
- } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- update_poll_flag = 1;
- continue;
- } else {
- ERR("Unexpected poll events %u for sock %d", revents, pollfd);
- goto error;
- }
- }
- }
-
-exit:
-error:
- lttng_poll_clean(&events);
-error_poll_create:
-error_testpoint:
- utils_close_pipe(kernel_poll_pipe);
- kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1;
- if (err) {
- health_error();
- ERR("Health error occurred in %s", __func__);
- WARN("Kernel thread died unexpectedly. "
- "Kernel tracing can continue but CPU hotplug is disabled.");
- }
- health_unregister(health_sessiond);
- DBG("Kernel thread dying");
- return NULL;
-}
-
-/*
- * Signal pthread condition of the consumer data that the thread.
- */
-static void signal_consumer_condition(struct consumer_data *data, int state)
-{
- pthread_mutex_lock(&data->cond_mutex);
-
- /*
- * The state is set before signaling. It can be any value, it's the waiter
- * job to correctly interpret this condition variable associated to the
- * consumer pthread_cond.
- *
- * A value of 0 means that the corresponding thread of the consumer data
- * was not started. 1 indicates that the thread has started and is ready
- * for action. A negative value means that there was an error during the
- * thread bootstrap.
- */
- data->consumer_thread_is_ready = state;
- (void) pthread_cond_signal(&data->cond);
-
- pthread_mutex_unlock(&data->cond_mutex);
-}
-
-/*
- * This thread manage the consumer error sent back to the session daemon.
- */
-void *thread_manage_consumer(void *data)
-{
- int sock = -1, i, ret, pollfd, err = -1, should_quit = 0;
- uint32_t revents, nb_fd;
- enum lttcomm_return_code code;
- struct lttng_poll_event events;
- struct consumer_data *consumer_data = data;
- struct consumer_socket *cmd_socket_wrapper = NULL;
-
- DBG("[thread] Manage consumer started");
-
- rcu_register_thread();
- rcu_thread_online();
-
- health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER);
-
- health_code_update();
-
- /*
- * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the
- * metadata_sock. Nothing more will be added to this poll set.
- */
- ret = sessiond_set_thread_pollset(&events, 3);
- if (ret < 0) {
- goto error_poll;
- }
-
- /*
- * The error socket here is already in a listening state which was done
- * just before spawning this thread to avoid a race between the consumer
- * daemon exec trying to connect and the listen() call.
- */
- ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
- if (ret < 0) {
- goto error;
- }
-
- health_code_update();
-
- /* Infinite blocking call, waiting for transmission */
-restart:
- health_poll_entry();
-
- if (testpoint(sessiond_thread_manage_consumer)) {
- goto error;
- }
-
- ret = lttng_poll_wait(&events, -1);
- health_poll_exit();
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- goto restart;
- }
- goto error;
- }
-
- nb_fd = ret;
-
- for (i = 0; i < nb_fd; i++) {
- /* Fetch once the poll data */
- revents = LTTNG_POLL_GETEV(&events, i);
- pollfd = LTTNG_POLL_GETFD(&events, i);
-
- health_code_update();
-
- if (!revents) {
- /* No activity for this FD (poll implementation). */
- continue;
- }
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = sessiond_check_thread_quit_pipe(pollfd, revents);
- if (ret) {
- err = 0;
- goto exit;
- }
-
- /* Event on the registration socket */
- if (pollfd == consumer_data->err_sock) {
- if (revents & LPOLLIN) {
- continue;
- } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("consumer err socket poll error");
- goto error;
- } else {
- ERR("Unexpected poll events %u for sock %d", revents, pollfd);
- goto error;
- }
- }
- }
-
- sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
- if (sock < 0) {
- goto error;
- }
-
- /*
- * Set the CLOEXEC flag. Return code is useless because either way, the
- * show must go on.
- */
- (void) utils_set_fd_cloexec(sock);
-
- health_code_update();
-
- DBG2("Receiving code from consumer err_sock");
-
- /* Getting status code from kconsumerd */
- ret = lttcomm_recv_unix_sock(sock, &code,
- sizeof(enum lttcomm_return_code));
- if (ret <= 0) {
- goto error;
- }
-
- health_code_update();
- if (code != LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) {
- ERR("consumer error when waiting for SOCK_READY : %s",
- lttcomm_get_readable_code(-code));
- goto error;
- }
-
- /* Connect both command and metadata sockets. */
- consumer_data->cmd_sock =
- lttcomm_connect_unix_sock(
- consumer_data->cmd_unix_sock_path);
- consumer_data->metadata_fd =
- lttcomm_connect_unix_sock(
- consumer_data->cmd_unix_sock_path);
- if (consumer_data->cmd_sock < 0 || consumer_data->metadata_fd < 0) {
- PERROR("consumer connect cmd socket");
- /* On error, signal condition and quit. */
- signal_consumer_condition(consumer_data, -1);
- goto error;
- }
-
- consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd;
-
- /* Create metadata socket lock. */
- consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t));
- if (consumer_data->metadata_sock.lock == NULL) {
- PERROR("zmalloc pthread mutex");
- goto error;
- }
- pthread_mutex_init(consumer_data->metadata_sock.lock, NULL);
-
- DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock);
- DBG("Consumer metadata socket ready (fd: %d)",
- consumer_data->metadata_fd);
-
- /*
- * Remove the consumerd error sock since we've established a connection.
- */
- ret = lttng_poll_del(&events, consumer_data->err_sock);
- if (ret < 0) {
- goto error;
- }
-
- /* Add new accepted error socket. */
- ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
- if (ret < 0) {
- goto error;
- }
-
- /* Add metadata socket that is successfully connected. */
- ret = lttng_poll_add(&events, consumer_data->metadata_fd,
- LPOLLIN | LPOLLRDHUP);
- if (ret < 0) {
- goto error;
- }
-
- health_code_update();
-
- /*
- * Transfer the write-end of the channel monitoring and rotate pipe
- * to the consumer by issuing a SET_CHANNEL_MONITOR_PIPE command.
- */
- cmd_socket_wrapper = consumer_allocate_socket(&consumer_data->cmd_sock);
- if (!cmd_socket_wrapper) {
- goto error;
- }
- cmd_socket_wrapper->lock = &consumer_data->lock;
-
- ret = consumer_send_channel_monitor_pipe(cmd_socket_wrapper,
- consumer_data->channel_monitor_pipe);
- if (ret) {
- goto error;
- }
-
- /* Discard the socket wrapper as it is no longer needed. */
- consumer_destroy_socket(cmd_socket_wrapper);
- cmd_socket_wrapper = NULL;
-
- /* The thread is completely initialized, signal that it is ready. */
- signal_consumer_condition(consumer_data, 1);
-
- /* Infinite blocking call, waiting for transmission */
-restart_poll:
- while (1) {
- health_code_update();
-
- /* Exit the thread because the thread quit pipe has been triggered. */
- if (should_quit) {
- /* Not a health error. */
- err = 0;
- goto exit;
- }
-
- health_poll_entry();
- ret = lttng_poll_wait(&events, -1);
- health_poll_exit();
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- goto restart_poll;
- }
- goto error;
- }
-
- nb_fd = ret;
-
- for (i = 0; i < nb_fd; i++) {
- /* Fetch once the poll data */
- revents = LTTNG_POLL_GETEV(&events, i);
- pollfd = LTTNG_POLL_GETFD(&events, i);
-
- health_code_update();
-
- if (!revents) {
- /* No activity for this FD (poll implementation). */
- continue;
- }
-
- /*
- * Thread quit pipe has been triggered, flag that we should stop
- * but continue the current loop to handle potential data from
- * consumer.
- */
- should_quit = sessiond_check_thread_quit_pipe(pollfd, revents);
-
- if (pollfd == sock) {
- /* Event on the consumerd socket */
- if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)
- && !(revents & LPOLLIN)) {
- ERR("consumer err socket second poll error");
- goto error;
- }
- health_code_update();
- /* Wait for any kconsumerd error */
- ret = lttcomm_recv_unix_sock(sock, &code,
- sizeof(enum lttcomm_return_code));
- if (ret <= 0) {
- ERR("consumer closed the command socket");
- goto error;
- }
-
- ERR("consumer return code : %s",
- lttcomm_get_readable_code(-code));
-
- goto exit;
- } else if (pollfd == consumer_data->metadata_fd) {
- if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)
- && !(revents & LPOLLIN)) {
- ERR("consumer err metadata socket second poll error");
- goto error;
- }
- /* UST metadata requests */
- ret = ust_consumer_metadata_request(
- &consumer_data->metadata_sock);
- if (ret < 0) {
- ERR("Handling metadata request");
- goto error;
- }
- }
- /* No need for an else branch all FDs are tested prior. */
- }
- health_code_update();
- }
-
-exit:
-error:
- /*
- * We lock here because we are about to close the sockets and some other
- * thread might be using them so get exclusive access which will abort all
- * other consumer command by other threads.
- */
- pthread_mutex_lock(&consumer_data->lock);
-
- /* Immediately set the consumerd state to stopped */
- if (consumer_data->type == LTTNG_CONSUMER_KERNEL) {
- uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR);
- } else if (consumer_data->type == LTTNG_CONSUMER64_UST ||
- consumer_data->type == LTTNG_CONSUMER32_UST) {
- uatomic_set(&ust_consumerd_state, CONSUMER_ERROR);
- } else {
- /* Code flow error... */
- assert(0);
- }
-
- if (consumer_data->err_sock >= 0) {
- ret = close(consumer_data->err_sock);
- if (ret) {
- PERROR("close");
- }
- consumer_data->err_sock = -1;
- }
- if (consumer_data->cmd_sock >= 0) {
- ret = close(consumer_data->cmd_sock);
- if (ret) {
- PERROR("close");
- }
- consumer_data->cmd_sock = -1;
- }
- if (consumer_data->metadata_sock.fd_ptr &&
- *consumer_data->metadata_sock.fd_ptr >= 0) {
- ret = close(*consumer_data->metadata_sock.fd_ptr);
- if (ret) {
- PERROR("close");
- }
- }
- if (sock >= 0) {
- ret = close(sock);
- if (ret) {
- PERROR("close");
- }
- }
-
- unlink(consumer_data->err_unix_sock_path);
- unlink(consumer_data->cmd_unix_sock_path);
- pthread_mutex_unlock(&consumer_data->lock);
-
- /* Cleanup metadata socket mutex. */
- if (consumer_data->metadata_sock.lock) {
- pthread_mutex_destroy(consumer_data->metadata_sock.lock);
- free(consumer_data->metadata_sock.lock);
- }
- lttng_poll_clean(&events);
-
- if (cmd_socket_wrapper) {
- consumer_destroy_socket(cmd_socket_wrapper);
- }
-error_poll:
- if (err) {
- health_error();
- ERR("Health error occurred in %s", __func__);
- }
- health_unregister(health_sessiond);
- DBG("consumer thread cleanup completed");
-
- rcu_thread_offline();
- rcu_unregister_thread();
-
- return NULL;
-}
-
-/*
- * This thread receives application command sockets (FDs) on the
- * apps_cmd_pipe and waits (polls) on them until they are closed
- * or an error occurs.
- *
- * At that point, it flushes the data (tracing and metadata) associated
- * with this application and tears down ust app sessions and other
- * associated data structures through ust_app_unregister().
- *
- * Note that this thread never sends commands to the applications
- * through the command sockets; it merely listens for hang-ups
- * and errors on those sockets and cleans-up as they occur.
- */
-static void *thread_manage_apps(void *data)
-{
- int i, ret, pollfd, err = -1;
- ssize_t size_ret;
- uint32_t revents, nb_fd;
- struct lttng_poll_event events;
-
- DBG("[thread] Manage application started");
-
- rcu_register_thread();
- rcu_thread_online();
-
- health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_MANAGE);
-
- if (testpoint(sessiond_thread_manage_apps)) {
- goto error_testpoint;
- }
-
- health_code_update();
-
- ret = sessiond_set_thread_pollset(&events, 2);
- if (ret < 0) {
- goto error_poll_create;
- }
-
- ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
- if (ret < 0) {
- goto error;
- }
-
- if (testpoint(sessiond_thread_manage_apps_before_loop)) {
- goto error;
- }
-
- health_code_update();
-
- while (1) {
- DBG("Apps thread polling");
-
- /* Inifinite blocking call, waiting for transmission */
- restart:
- health_poll_entry();
- ret = lttng_poll_wait(&events, -1);
- DBG("Apps thread return from poll on %d fds",
- LTTNG_POLL_GETNB(&events));
- health_poll_exit();
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- goto restart;
- }
- goto error;
- }
-
- nb_fd = ret;
-
- for (i = 0; i < nb_fd; i++) {
- /* Fetch once the poll data */
- revents = LTTNG_POLL_GETEV(&events, i);
- pollfd = LTTNG_POLL_GETFD(&events, i);
-
- health_code_update();
-
- if (!revents) {
- /* No activity for this FD (poll implementation). */
- continue;
- }
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = sessiond_check_thread_quit_pipe(pollfd, revents);
- if (ret) {
- err = 0;
- goto exit;
- }
-
- /* Inspect the apps cmd pipe */
- if (pollfd == apps_cmd_pipe[0]) {
- if (revents & LPOLLIN) {
- int sock;
-
- /* Empty pipe */
- size_ret = lttng_read(apps_cmd_pipe[0], &sock, sizeof(sock));
- if (size_ret < sizeof(sock)) {
- PERROR("read apps cmd pipe");
- goto error;
- }
-
- health_code_update();
-
- /*
- * Since this is a command socket (write then read),
- * we only monitor the error events of the socket.
- */
- ret = lttng_poll_add(&events, sock,
- LPOLLERR | LPOLLHUP | LPOLLRDHUP);
- if (ret < 0) {
- goto error;
- }
-
- DBG("Apps with sock %d added to poll set", sock);
- } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("Apps command pipe error");
- goto error;
- } else {
- ERR("Unknown poll events %u for sock %d", revents, pollfd);
- goto error;
- }
- } else {
- /*
- * At this point, we know that a registered application made
- * the event at poll_wait.
- */
- if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- /* Removing from the poll set */
- ret = lttng_poll_del(&events, pollfd);
- if (ret < 0) {
- goto error;
- }
-
- /* Socket closed on remote end. */
- ust_app_unregister(pollfd);
- } else {
- ERR("Unexpected poll events %u for sock %d", revents, pollfd);
- goto error;
- }
- }
-
- health_code_update();
- }
- }
-
-exit:
-error:
- lttng_poll_clean(&events);
-error_poll_create:
-error_testpoint:
- utils_close_pipe(apps_cmd_pipe);
- apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1;
-
- /*
- * We don't clean the UST app hash table here since already registered
- * applications can still be controlled so let them be until the session
- * daemon dies or the applications stop.
- */
-
- if (err) {
- health_error();
- ERR("Health error occurred in %s", __func__);
- }
- health_unregister(health_sessiond);
- DBG("Application communication apps thread cleanup complete");
- rcu_thread_offline();
- rcu_unregister_thread();
- return NULL;
-}
-
-/*
- * Send a socket to a thread This is called from the dispatch UST registration
- * thread once all sockets are set for the application.
- *
- * The sock value can be invalid, we don't really care, the thread will handle
- * it and make the necessary cleanup if so.
- *
- * On success, return 0 else a negative value being the errno message of the
- * write().
- */
-static int send_socket_to_thread(int fd, int sock)
-{
- ssize_t ret;
-
- /*
- * It's possible that the FD is set as invalid with -1 concurrently just
- * before calling this function being a shutdown state of the thread.
- */
- if (fd < 0) {
- ret = -EBADF;
- goto error;
- }
-
- ret = lttng_write(fd, &sock, sizeof(sock));
- if (ret < sizeof(sock)) {
- PERROR("write apps pipe %d", fd);
- if (ret < 0) {
- ret = -errno;
- }
- goto error;
- }
-
- /* All good. Don't send back the write positive ret value. */
- ret = 0;
-error:
- return (int) ret;
-}
-
-/*
- * Sanitize the wait queue of the dispatch registration thread meaning removing
- * invalid nodes from it. This is to avoid memory leaks for the case the UST
- * notify socket is never received.
- */
-static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue)
-{
- int ret, nb_fd = 0, i;
- unsigned int fd_added = 0;
- struct lttng_poll_event events;
- struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node;
-
- assert(wait_queue);
-
- lttng_poll_init(&events);
-
- /* Just skip everything for an empty queue. */
- if (!wait_queue->count) {
- goto end;
- }
-
- ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC);
- if (ret < 0) {
- goto error_create;
- }
-
- cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
- &wait_queue->head, head) {
- assert(wait_node->app);
- ret = lttng_poll_add(&events, wait_node->app->sock,
- LPOLLHUP | LPOLLERR);
- if (ret < 0) {
- goto error;
- }
-
- fd_added = 1;
- }
-
- if (!fd_added) {
- goto end;
- }
-
- /*
- * Poll but don't block so we can quickly identify the faulty events and
- * clean them afterwards from the wait queue.
- */
- ret = lttng_poll_wait(&events, 0);
- if (ret < 0) {
- goto error;
- }
- nb_fd = ret;
-
- for (i = 0; i < nb_fd; i++) {
- /* Get faulty FD. */
- uint32_t revents = LTTNG_POLL_GETEV(&events, i);
- int pollfd = LTTNG_POLL_GETFD(&events, i);
-
- if (!revents) {
- /* No activity for this FD (poll implementation). */
- continue;
- }
-
- cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
- &wait_queue->head, head) {
- if (pollfd == wait_node->app->sock &&
- (revents & (LPOLLHUP | LPOLLERR))) {
- cds_list_del(&wait_node->head);
- wait_queue->count--;
- ust_app_destroy(wait_node->app);
- free(wait_node);
- /*
- * Silence warning of use-after-free in
- * cds_list_for_each_entry_safe which uses
- * __typeof__(*wait_node).
- */
- wait_node = NULL;
- break;
- } else {
- ERR("Unexpected poll events %u for sock %d", revents, pollfd);
- goto error;
- }
- }
- }
-
- if (nb_fd > 0) {
- DBG("Wait queue sanitized, %d node were cleaned up", nb_fd);
- }
-
-end:
- lttng_poll_clean(&events);
- return;
-
-error:
- lttng_poll_clean(&events);
-error_create:
- ERR("Unable to sanitize wait queue");
- return;
-}
-
-/*
- * Dispatch request from the registration threads to the application
- * communication thread.
- */
-static void *thread_dispatch_ust_registration(void *data)
-{
- int ret, err = -1;
- struct cds_wfcq_node *node;
- struct ust_command *ust_cmd = NULL;
- struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node;
- struct ust_reg_wait_queue wait_queue = {
- .count = 0,
- };
-
- rcu_register_thread();
-
- health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH);
-
- if (testpoint(sessiond_thread_app_reg_dispatch)) {
- goto error_testpoint;
- }
-
- health_code_update();
-
- CDS_INIT_LIST_HEAD(&wait_queue.head);
-
- DBG("[thread] Dispatch UST command started");
-
- for (;;) {
- health_code_update();
-
- /* Atomically prepare the queue futex */
- futex_nto1_prepare(&ust_cmd_queue.futex);
-
- if (CMM_LOAD_SHARED(dispatch_thread_exit)) {
- break;
- }
-
- do {
- struct ust_app *app = NULL;
- ust_cmd = NULL;
-
- /*
- * Make sure we don't have node(s) that have hung up before receiving
- * the notify socket. This is to clean the list in order to avoid
- * memory leaks from notify socket that are never seen.
- */
- sanitize_wait_queue(&wait_queue);
-
- health_code_update();
- /* Dequeue command for registration */
- node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail);
- if (node == NULL) {
- DBG("Woken up but nothing in the UST command queue");
- /* Continue thread execution */
- break;
- }
-
- ust_cmd = caa_container_of(node, struct ust_command, node);
-
- DBG("Dispatching UST registration 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);
-
- if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) {
- wait_node = zmalloc(sizeof(*wait_node));
- if (!wait_node) {
- PERROR("zmalloc wait_node dispatch");
- ret = close(ust_cmd->sock);
- if (ret < 0) {
- PERROR("close ust sock dispatch %d", ust_cmd->sock);
- }
- lttng_fd_put(LTTNG_FD_APPS, 1);
- free(ust_cmd);
- goto error;
- }
- CDS_INIT_LIST_HEAD(&wait_node->head);
-
- /* Create application object if socket is CMD. */
- wait_node->app = ust_app_create(&ust_cmd->reg_msg,
- ust_cmd->sock);
- if (!wait_node->app) {
- ret = close(ust_cmd->sock);
- if (ret < 0) {
- PERROR("close ust sock dispatch %d", ust_cmd->sock);
- }
- lttng_fd_put(LTTNG_FD_APPS, 1);
- free(wait_node);
- free(ust_cmd);
- continue;
- }
- /*
- * Add application to the wait queue so we can set the notify
- * socket before putting this object in the global ht.
- */
- cds_list_add(&wait_node->head, &wait_queue.head);
- wait_queue.count++;
-
- free(ust_cmd);
- /*
- * We have to continue here since we don't have the notify
- * socket and the application MUST be added to the hash table
- * only at that moment.
- */
- continue;
- } else {
- /*
- * Look for the application in the local wait queue and set the
- * notify socket if found.
- */
- cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
- &wait_queue.head, head) {
- health_code_update();
- if (wait_node->app->pid == ust_cmd->reg_msg.pid) {
- wait_node->app->notify_sock = ust_cmd->sock;
- cds_list_del(&wait_node->head);
- wait_queue.count--;
- app = wait_node->app;
- free(wait_node);
- DBG3("UST app notify socket %d is set", ust_cmd->sock);
- break;
- }
- }
-
- /*
- * With no application at this stage the received socket is
- * basically useless so close it before we free the cmd data
- * structure for good.
- */
- if (!app) {
- ret = close(ust_cmd->sock);
- if (ret < 0) {
- PERROR("close ust sock dispatch %d", ust_cmd->sock);
- }
- lttng_fd_put(LTTNG_FD_APPS, 1);
- }
- free(ust_cmd);
- }
-
- if (app) {
- /*
- * @session_lock_list
- *
- * Lock the global session list so from the register up to the
- * registration done message, no thread can see the application
- * and change its state.
- */
- session_lock_list();
- rcu_read_lock();
-
- /*
- * Add application to the global hash table. This needs to be
- * done before the update to the UST registry can locate the
- * application.
- */
- ust_app_add(app);
-
- /* Set app version. This call will print an error if needed. */
- (void) ust_app_version(app);
-
- /* Send notify socket through the notify pipe. */
- ret = send_socket_to_thread(apps_cmd_notify_pipe[1],
- app->notify_sock);
- if (ret < 0) {
- rcu_read_unlock();
- session_unlock_list();
- /*
- * No notify thread, stop the UST tracing. However, this is
- * not an internal error of the this thread thus setting
- * the health error code to a normal exit.
- */
- err = 0;
- goto error;
- }
-
- /*
- * Update newly registered application with the tracing
- * registry info already enabled information.
- */
- update_ust_app(app->sock);
-
- /*
- * Don't care about return value. Let the manage apps threads
- * handle app unregistration upon socket close.
- */
- (void) ust_app_register_done(app);
-
- /*
- * Even if the application socket has been closed, send the app
- * to the thread and unregistration will take place at that
- * place.
- */
- ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock);
- if (ret < 0) {
- rcu_read_unlock();
- session_unlock_list();
- /*
- * No apps. thread, stop the UST tracing. However, this is
- * not an internal error of the this thread thus setting
- * the health error code to a normal exit.
- */
- err = 0;
- goto error;
- }
-
- rcu_read_unlock();
- session_unlock_list();
- }
- } while (node != NULL);
-
- health_poll_entry();
- /* Futex wait on queue. Blocking call on futex() */
- futex_nto1_wait(&ust_cmd_queue.futex);
- health_poll_exit();
- }
- /* Normal exit, no error */
- err = 0;
-
-error:
- /* Clean up wait queue. */
- cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
- &wait_queue.head, head) {
- cds_list_del(&wait_node->head);
- wait_queue.count--;
- free(wait_node);
- }
-
- /* Empty command queue. */
- for (;;) {
- /* Dequeue command for registration */
- node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail);
- if (node == NULL) {
- break;
- }
- ust_cmd = caa_container_of(node, struct ust_command, node);
- ret = close(ust_cmd->sock);
- if (ret < 0) {
- PERROR("close ust sock exit dispatch %d", ust_cmd->sock);
- }
- lttng_fd_put(LTTNG_FD_APPS, 1);
- free(ust_cmd);
- }
-
-error_testpoint:
- DBG("Dispatch thread dying");
- if (err) {
- health_error();
- ERR("Health error occurred in %s", __func__);
- }
- health_unregister(health_sessiond);
- rcu_unregister_thread();
- return NULL;
-}
-
-/*
- * This thread manage application registration.
- */
-static void *thread_registration_apps(void *data)
-{
- int sock = -1, i, ret, pollfd, err = -1;
- uint32_t revents, nb_fd;
- struct lttng_poll_event events;
- /*
- * Get allocated in this thread, enqueued to a global queue, dequeued and
- * freed in the manage apps thread.
- */
- struct ust_command *ust_cmd = NULL;
-
- DBG("[thread] Manage application registration started");
-
- health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG);
-
- if (testpoint(sessiond_thread_registration_apps)) {
- goto error_testpoint;
- }
-
- ret = lttcomm_listen_unix_sock(apps_sock);
- if (ret < 0) {
- goto error_listen;
- }
-
- /*
- * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
- * more will be added to this poll set.
- */
- ret = sessiond_set_thread_pollset(&events, 2);
- if (ret < 0) {
- goto error_create_poll;
- }
-
- /* Add the application registration socket */
- ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
- if (ret < 0) {
- goto error_poll_add;
- }
-
- /* Notify all applications to register */
- ret = notify_ust_apps(1);
- if (ret < 0) {
- ERR("Failed to notify applications or create the wait shared memory.\n"
- "Execution continues but there might be problem for already\n"
- "running applications that wishes to register.");
- }
-
- while (1) {
- DBG("Accepting application registration");
-
- /* Inifinite blocking call, waiting for transmission */
- restart:
- health_poll_entry();
- ret = lttng_poll_wait(&events, -1);
- health_poll_exit();
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- goto restart;
- }
- goto error;
- }
-
- nb_fd = ret;
-
- for (i = 0; i < nb_fd; i++) {
- health_code_update();
-
- /* Fetch once the poll data */
- revents = LTTNG_POLL_GETEV(&events, i);
- pollfd = LTTNG_POLL_GETFD(&events, i);
-
- if (!revents) {
- /* No activity for this FD (poll implementation). */
- continue;
- }
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = sessiond_check_thread_quit_pipe(pollfd, revents);
- if (ret) {
- err = 0;
- goto exit;
- }
-
- /* Event on the registration socket */
- if (pollfd == apps_sock) {
- if (revents & LPOLLIN) {
- sock = lttcomm_accept_unix_sock(apps_sock);
- if (sock < 0) {
- goto error;
- }
-
- /*
- * Set socket timeout for both receiving and ending.
- * app_socket_timeout is in seconds, whereas
- * lttcomm_setsockopt_rcv_timeout and
- * lttcomm_setsockopt_snd_timeout expect msec as
- * parameter.
- */
- if (config.app_socket_timeout >= 0) {
- (void) lttcomm_setsockopt_rcv_timeout(sock,
- config.app_socket_timeout * 1000);
- (void) lttcomm_setsockopt_snd_timeout(sock,
- config.app_socket_timeout * 1000);
- }
-
- /*
- * Set the CLOEXEC flag. Return code is useless because
- * either way, the show must go on.
- */
- (void) utils_set_fd_cloexec(sock);
-
- /* Create UST registration command for enqueuing */
- ust_cmd = zmalloc(sizeof(struct ust_command));
- if (ust_cmd == NULL) {
- PERROR("ust command zmalloc");
- ret = close(sock);
- if (ret) {
- PERROR("close");
- }
- 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;
- }
-
- health_code_update();
- ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg);
- if (ret < 0) {
- free(ust_cmd);
- /* Close socket of the application. */
- ret = close(sock);
- if (ret) {
- PERROR("close");
- }
- lttng_fd_put(LTTNG_FD_APPS, 1);
- sock = -1;
- continue;
- }
- health_code_update();
-
- 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_wfcq_enqueue(&ust_cmd_queue.head, &ust_cmd_queue.tail, &ust_cmd->node);
-
- /*
- * Wake the registration queue futex. Implicit memory
- * barrier with the exchange in cds_wfcq_enqueue.
- */
- futex_nto1_wake(&ust_cmd_queue.futex);
- } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("Register apps socket poll error");
- goto error;
- } else {
- ERR("Unexpected poll events %u for sock %d", revents, pollfd);
- goto error;
- }
- }
- }
- }
-
-exit:
-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(config.apps_unix_sock_path.value);
-
-error_poll_add:
- lttng_poll_clean(&events);
-error_listen:
-error_create_poll:
-error_testpoint:
- DBG("UST Registration thread cleanup complete");
- if (err) {
- health_error();
- ERR("Health error occurred in %s", __func__);
- }
- health_unregister(health_sessiond);
-
- return NULL;
-}
-
-/*
- * 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);
- goto error_open;
- }
-
- /* Validate kernel version */
- ret = kernel_validate_version(kernel_tracer_fd, &kernel_tracer_version,
- &kernel_tracer_abi_version);
- if (ret < 0) {
- goto error_version;
- }
-
- ret = modprobe_lttng_data();
- if (ret < 0) {
- goto error_modules;
- }
-
- ret = kernel_supports_ring_buffer_snapshot_sample_positions(
- kernel_tracer_fd);
- if (ret < 0) {
- goto error_modules;
- }
-
- if (ret < 1) {
- WARN("Kernel tracer does not support buffer monitoring. "
- "The monitoring timer of channels in the kernel domain "
- "will be set to 0 (disabled).");
- }
-
- 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 LTTNG_ERR_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 LTTNG_ERR_NEED_ROOT_SESSIOND;
- } else {
- return LTTNG_ERR_KERN_NA;
- }
-}
-
-static int string_match(const char *str1, const char *str2)
-{
- return (str1 && str2) && !strcmp(str1, str2);
-}
-
-/*
- * Take an option from the getopt output and set it in the right variable to be
- * used later.
- *
- * Return 0 on success else a negative value.
- */
-static int set_option(int opt, const char *arg, const char *optname)
-{
- int ret = 0;
-
- if (string_match(optname, "client-sock") || opt == 'c') {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "-c, --client-sock");
- } else {
- config_string_set(&config.client_unix_sock_path,
- strdup(arg));
- if (!config.client_unix_sock_path.value) {
- ret = -ENOMEM;
- PERROR("strdup");
- }
- }
- } else if (string_match(optname, "apps-sock") || opt == 'a') {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "-a, --apps-sock");
- } else {
- config_string_set(&config.apps_unix_sock_path,
- strdup(arg));
- if (!config.apps_unix_sock_path.value) {
- ret = -ENOMEM;
- PERROR("strdup");
- }
- }
- } else if (string_match(optname, "daemonize") || opt == 'd') {
- config.daemonize = true;
- } else if (string_match(optname, "background") || opt == 'b') {
- config.background = true;
- } else if (string_match(optname, "group") || opt == 'g') {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "-g, --group");
- } else {
- config_string_set(&config.tracing_group_name,
- strdup(arg));
- if (!config.tracing_group_name.value) {
- ret = -ENOMEM;
- PERROR("strdup");
- }
- }
- } else if (string_match(optname, "help") || opt == 'h') {
- ret = utils_show_help(8, "lttng-sessiond", help_msg);
- if (ret) {
- ERR("Cannot show --help for `lttng-sessiond`");
- perror("exec");
- }
- exit(ret ? EXIT_FAILURE : EXIT_SUCCESS);
- } else if (string_match(optname, "version") || opt == 'V') {
- fprintf(stdout, "%s\n", VERSION);
- exit(EXIT_SUCCESS);
- } else if (string_match(optname, "sig-parent") || opt == 'S') {
- config.sig_parent = true;
- } else if (string_match(optname, "kconsumerd-err-sock")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--kconsumerd-err-sock");
- } else {
- config_string_set(&config.kconsumerd_err_unix_sock_path,
- strdup(arg));
- if (!config.kconsumerd_err_unix_sock_path.value) {
- ret = -ENOMEM;
- PERROR("strdup");
- }
- }
- } else if (string_match(optname, "kconsumerd-cmd-sock")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--kconsumerd-cmd-sock");
- } else {
- config_string_set(&config.kconsumerd_cmd_unix_sock_path,
- strdup(arg));
- if (!config.kconsumerd_cmd_unix_sock_path.value) {
- ret = -ENOMEM;
- PERROR("strdup");
- }
- }
- } else if (string_match(optname, "ustconsumerd64-err-sock")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--ustconsumerd64-err-sock");
- } else {
- config_string_set(&config.consumerd64_err_unix_sock_path,
- strdup(arg));
- if (!config.consumerd64_err_unix_sock_path.value) {
- ret = -ENOMEM;
- PERROR("strdup");
- }
- }
- } else if (string_match(optname, "ustconsumerd64-cmd-sock")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--ustconsumerd64-cmd-sock");
- } else {
- config_string_set(&config.consumerd64_cmd_unix_sock_path,
- strdup(arg));
- if (!config.consumerd64_cmd_unix_sock_path.value) {
- ret = -ENOMEM;
- PERROR("strdup");
- }
- }
- } else if (string_match(optname, "ustconsumerd32-err-sock")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--ustconsumerd32-err-sock");
- } else {
- config_string_set(&config.consumerd32_err_unix_sock_path,
- strdup(arg));
- if (!config.consumerd32_err_unix_sock_path.value) {
- ret = -ENOMEM;
- PERROR("strdup");
- }
- }
- } else if (string_match(optname, "ustconsumerd32-cmd-sock")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--ustconsumerd32-cmd-sock");
- } else {
- config_string_set(&config.consumerd32_cmd_unix_sock_path,
- strdup(arg));
- if (!config.consumerd32_cmd_unix_sock_path.value) {
- ret = -ENOMEM;
- PERROR("strdup");
- }
- }
- } else if (string_match(optname, "no-kernel")) {
- config.no_kernel = true;
- } else if (string_match(optname, "quiet") || opt == 'q') {
- config.quiet = true;
- } else if (string_match(optname, "verbose") || opt == 'v') {
- /* Verbose level can increase using multiple -v */
- if (arg) {
- /* Value obtained from config file */
- config.verbose = config_parse_value(arg);
- } else {
- /* -v used on command line */
- config.verbose++;
- }
- /* Clamp value to [0, 3] */
- config.verbose = config.verbose < 0 ? 0 :
- (config.verbose <= 3 ? config.verbose : 3);
- } else if (string_match(optname, "verbose-consumer")) {
- if (arg) {
- config.verbose_consumer = config_parse_value(arg);
- } else {
- config.verbose_consumer++;
- }
- } else if (string_match(optname, "consumerd32-path")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--consumerd32-path");
- } else {
- config_string_set(&config.consumerd32_bin_path,
- strdup(arg));
- if (!config.consumerd32_bin_path.value) {
- PERROR("strdup");
- ret = -ENOMEM;
- }
- }
- } else if (string_match(optname, "consumerd32-libdir")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--consumerd32-libdir");
- } else {
- config_string_set(&config.consumerd32_lib_dir,
- strdup(arg));
- if (!config.consumerd32_lib_dir.value) {
- PERROR("strdup");
- ret = -ENOMEM;
- }
- }
- } else if (string_match(optname, "consumerd64-path")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--consumerd64-path");
- } else {
- config_string_set(&config.consumerd64_bin_path,
- strdup(arg));
- if (!config.consumerd64_bin_path.value) {
- PERROR("strdup");
- ret = -ENOMEM;
- }
- }
- } else if (string_match(optname, "consumerd64-libdir")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--consumerd64-libdir");
- } else {
- config_string_set(&config.consumerd64_lib_dir,
- strdup(arg));
- if (!config.consumerd64_lib_dir.value) {
- PERROR("strdup");
- ret = -ENOMEM;
- }
- }
- } else if (string_match(optname, "pidfile") || opt == 'p') {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "-p, --pidfile");
- } else {
- config_string_set(&config.pid_file_path, strdup(arg));
- if (!config.pid_file_path.value) {
- PERROR("strdup");
- ret = -ENOMEM;
- }
- }
- } else if (string_match(optname, "agent-tcp-port")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--agent-tcp-port");
- } else {
- unsigned long v;
-
- errno = 0;
- v = strtoul(arg, NULL, 0);
- if (errno != 0 || !isdigit(arg[0])) {
- ERR("Wrong value in --agent-tcp-port parameter: %s", arg);
- return -1;
- }
- if (v == 0 || v >= 65535) {
- ERR("Port overflow in --agent-tcp-port parameter: %s", arg);
- return -1;
- }
- config.agent_tcp_port.begin = config.agent_tcp_port.end = (int) v;
- DBG3("Agent TCP port set to non default: %i", (int) v);
- }
- } else if (string_match(optname, "load") || opt == 'l') {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "-l, --load");
- } else {
- config_string_set(&config.load_session_path, strdup(arg));
- if (!config.load_session_path.value) {
- PERROR("strdup");
- ret = -ENOMEM;
- }
- }
- } else if (string_match(optname, "kmod-probes")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--kmod-probes");
- } else {
- config_string_set(&config.kmod_probes_list, strdup(arg));
- if (!config.kmod_probes_list.value) {
- PERROR("strdup");
- ret = -ENOMEM;
- }
- }
- } else if (string_match(optname, "extra-kmod-probes")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--extra-kmod-probes");
- } else {
- config_string_set(&config.kmod_extra_probes_list,
- strdup(arg));
- if (!config.kmod_extra_probes_list.value) {
- PERROR("strdup");
- ret = -ENOMEM;
- }
- }
- } else if (string_match(optname, "config") || opt == 'f') {
- /* This is handled in set_options() thus silent skip. */
- goto end;
- } else {
- /* Unknown option or other error.
- * Error is printed by getopt, just return */
- ret = -1;
- }
-
-end:
- if (ret == -EINVAL) {
- const char *opt_name = "unknown";
- int i;
-
- for (i = 0; i < sizeof(long_options) / sizeof(struct option);
- i++) {
- if (opt == long_options[i].val) {
- opt_name = long_options[i].name;
- break;
- }
- }
-
- WARN("Invalid argument provided for option \"%s\", using default value.",
- opt_name);
- }
-
- return ret;
-}
-
-/*
- * config_entry_handler_cb used to handle options read from a config file.
- * See config_entry_handler_cb comment in common/config/session-config.h for the
- * return value conventions.
- */
-static int config_entry_handler(const struct config_entry *entry, void *unused)
-{
- int ret = 0, i;
-
- if (!entry || !entry->name || !entry->value) {
- ret = -EINVAL;
- goto end;
- }
-
- /* Check if the option is to be ignored */
- for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) {
- if (!strcmp(entry->name, config_ignore_options[i])) {
- goto end;
- }
- }
-
- for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1;
- i++) {
-
- /* Ignore if not fully matched. */
- if (strcmp(entry->name, long_options[i].name)) {
- continue;
- }
-
- /*
- * If the option takes no argument on the command line, we have to
- * check if the value is "true". We support non-zero numeric values,
- * true, on and yes.
- */
- if (!long_options[i].has_arg) {
- ret = config_parse_value(entry->value);
- if (ret <= 0) {
- if (ret) {
- WARN("Invalid configuration value \"%s\" for option %s",
- entry->value, entry->name);
- }
- /* False, skip boolean config option. */
- goto end;
- }
- }
-
- ret = set_option(long_options[i].val, entry->value, entry->name);
- goto end;
- }
-
- WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name);
-
-end:
- return ret;
-}
-
-/*
- * daemon configuration loading and argument parsing
- */
-static int set_options(int argc, char **argv)
-{
- int ret = 0, c = 0, option_index = 0;
- int orig_optopt = optopt, orig_optind = optind;
- char *optstring;
- const char *config_path = NULL;
-
- optstring = utils_generate_optstring(long_options,
- sizeof(long_options) / sizeof(struct option));
- if (!optstring) {
- ret = -ENOMEM;
- goto end;
- }
-
- /* Check for the --config option */
- while ((c = getopt_long(argc, argv, optstring, long_options,
- &option_index)) != -1) {
- if (c == '?') {
- ret = -EINVAL;
- goto end;
- } else if (c != 'f') {
- /* if not equal to --config option. */
- continue;
- }
-
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "-f, --config");
- } else {
- config_path = utils_expand_path(optarg);
- if (!config_path) {
- ERR("Failed to resolve path: %s", optarg);
- }
- }
- }
-
- ret = config_get_section_entries(config_path, config_section_name,
- config_entry_handler, NULL);
- if (ret) {
- if (ret > 0) {
- ERR("Invalid configuration option at line %i", ret);
- ret = -1;
- }
- goto end;
- }
-
- /* Reset getopt's global state */
- optopt = orig_optopt;
- optind = orig_optind;
- while (1) {
- option_index = -1;
- /*
- * getopt_long() will not set option_index if it encounters a
- * short option.
- */
- c = getopt_long(argc, argv, optstring, long_options,
- &option_index);
- if (c == -1) {
- break;
- }
-
- /*
- * Pass NULL as the long option name if popt left the index
- * unset.
- */
- ret = set_option(c, optarg,
- option_index < 0 ? NULL :
- long_options[option_index].name);
- if (ret < 0) {
- break;
- }
- }
-
-end:
- free(optstring);
- return ret;
-}
-
-/*
- * Creates the application socket.
- */
-static int init_daemon_socket(void)
-{
- int ret = 0;
- mode_t old_umask;
-
- old_umask = umask(0);
-
- /* Create the application unix socket */
- apps_sock = lttcomm_create_unix_sock(config.apps_unix_sock_path.value);
- if (apps_sock < 0) {
- ERR("Create unix sock failed: %s", config.apps_unix_sock_path.value);
- ret = -1;
- goto end;
- }
-
- /* Set the cloexec flag */
- ret = utils_set_fd_cloexec(apps_sock);
- if (ret < 0) {
- ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
- "Continuing but note that the consumer daemon will have a "
- "reference to this socket on exec()", apps_sock);
- }
-
- /* File permission MUST be 666 */
- ret = chmod(config.apps_unix_sock_path.value,
- S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
- if (ret < 0) {
- ERR("Set file permissions failed: %s", config.apps_unix_sock_path.value);
- PERROR("chmod");
- goto end;
- }
-
- DBG3("Session daemon application socket %d created",
- apps_sock);
-
-end:
- umask(old_umask);
- return ret;
-}
-
-/*
- * Create lockfile using the rundir and return its fd.
- */
-static int create_lockfile(void)
-{
- return utils_create_lock_file(config.lock_file_path.value);
-}
-
-/*
- * Check if the global socket is available, and if a daemon is answering at the
- * other side. If yes, error is returned.
- *
- * Also attempts to create and hold the lock file.
- */
-static int check_existing_daemon(void)
-{
- int ret = 0;
-
- /* Is there anybody out there ? */
- if (lttng_session_daemon_alive()) {
- ret = -EEXIST;
- goto end;
- }
-
- lockfile_fd = create_lockfile();
- if (lockfile_fd < 0) {
- ret = -EEXIST;
- goto end;
- }
-end:
- return ret;
-}
-
-static void sessiond_cleanup_lock_file(void)
-{
- int ret;
-
- /*
- * Cleanup lock file by deleting it and finaly closing it which will
- * release the file system lock.
- */
- if (lockfile_fd >= 0) {
- ret = remove(config.lock_file_path.value);
- if (ret < 0) {
- PERROR("remove lock file");
- }
- ret = close(lockfile_fd);
- if (ret < 0) {
- PERROR("close lock file");
- }
- }
-}
-
-/*
- * Set the tracing group gid onto the client socket.
- *
- * Race window between mkdir and chown is OK because we are going from more
- * permissive (root.root) to less permissive (root.tracing).
- */
-static int set_permissions(char *rundir)
-{
- int ret;
- gid_t gid;
-
- gid = utils_get_group_id(config.tracing_group_name.value);
-
- /* Set lttng run dir */
- ret = chown(rundir, 0, gid);
- if (ret < 0) {
- ERR("Unable to set group on %s", rundir);
- PERROR("chown");
- }
-
- /*
- * Ensure all applications and tracing group can search the run
- * dir. Allow everyone to read the directory, since it does not
- * buy us anything to hide its content.
- */
- ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
- if (ret < 0) {
- ERR("Unable to set permissions on %s", rundir);
- PERROR("chmod");
- }
-
- /* lttng client socket path */
- ret = chown(config.client_unix_sock_path.value, 0, gid);
- if (ret < 0) {
- ERR("Unable to set group on %s", config.client_unix_sock_path.value);
- PERROR("chown");
- }
-
- /* kconsumer error socket path */
- ret = chown(kconsumer_data.err_unix_sock_path, 0, 0);
- if (ret < 0) {
- ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
- PERROR("chown");
- }
-
- /* 64-bit ustconsumer error socket path */
- ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0);
- if (ret < 0) {
- ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
- PERROR("chown");
- }
-
- /* 32-bit ustconsumer compat32 error socket path */
- ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0);
- if (ret < 0) {
- ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
- PERROR("chown");
- }
-
- DBG("All permissions are set");
-
- return ret;
-}
-
-/*
- * Create the lttng run directory needed for all global sockets and pipe.
- */
-static int create_lttng_rundir(void)
-{
- int ret;
-
- DBG3("Creating LTTng run directory: %s", config.rundir.value);
-
- ret = mkdir(config.rundir.value, S_IRWXU);
- if (ret < 0) {
- if (errno != EEXIST) {
- ERR("Unable to create %s", config.rundir.value);
- goto error;
- } else {
- ret = 0;
- }
- }
-
-error:
- return ret;
-}
-
-/*
- * Setup sockets and directory needed by the consumerds' communication with the
- * session daemon.
- */
-static int set_consumer_sockets(struct consumer_data *consumer_data)
-{
- int ret;
- char *path = NULL;
-
- switch (consumer_data->type) {
- case LTTNG_CONSUMER_KERNEL:
- path = config.kconsumerd_path.value;
- break;
- case LTTNG_CONSUMER64_UST:
- path = config.consumerd64_path.value;
- break;
- case LTTNG_CONSUMER32_UST:
- path = config.consumerd32_path.value;
- break;
- default:
- ERR("Consumer type unknown");
- ret = -EINVAL;
- goto error;
- }
- assert(path);
-
- DBG2("Creating consumer directory: %s", path);
-
- ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP);
- if (ret < 0 && errno != EEXIST) {
- PERROR("mkdir");
- ERR("Failed to create %s", path);
- goto error;
- }
- if (is_root) {
- ret = chown(path, 0, utils_get_group_id(config.tracing_group_name.value));
- if (ret < 0) {
- ERR("Unable to set group on %s", path);
- PERROR("chown");
- goto error;
- }
- }
-
- /* Create the consumerd error unix socket */
- consumer_data->err_sock =
- lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
- if (consumer_data->err_sock < 0) {
- ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
- ret = -1;
- goto error;
- }
-
- /*
- * Set the CLOEXEC flag. Return code is useless because either way, the
- * show must go on.
- */
- ret = utils_set_fd_cloexec(consumer_data->err_sock);
- if (ret < 0) {
- PERROR("utils_set_fd_cloexec");
- /* continue anyway */
- }
-
- /* File permission MUST be 660 */
- ret = chmod(consumer_data->err_unix_sock_path,
- S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
- if (ret < 0) {
- ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
- PERROR("chmod");
- goto error;
- }
-
-error:
- return ret;
-}
-
-/*
- * Signal handler for the daemon
- *
- * Simply stop all worker threads, leaving main() return gracefully after
- * joining all threads and calling cleanup().
- */
-static void sighandler(int sig)
-{
- switch (sig) {
- case SIGINT:
- DBG("SIGINT caught");
- stop_threads();
- break;
- case SIGTERM:
- DBG("SIGTERM caught");
- stop_threads();
- break;
- case SIGUSR1:
- CMM_STORE_SHARED(recv_child_signal, 1);
- break;
- default:
- break;
- }
-}
-
-/*
- * Setup signal handler for :
- * SIGINT, SIGTERM, SIGPIPE
- */
-static int set_signal_handler(void)
-{
- int ret = 0;
- struct sigaction sa;
- sigset_t sigset;
-
- if ((ret = sigemptyset(&sigset)) < 0) {
- PERROR("sigemptyset");
- return ret;
- }
-
- sa.sa_mask = sigset;
- sa.sa_flags = 0;
-
- sa.sa_handler = sighandler;
- if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
- PERROR("sigaction");
- return ret;
- }
-
- if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
- PERROR("sigaction");
- return ret;
- }
-
- if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
- PERROR("sigaction");
- return ret;
- }
-
- sa.sa_handler = SIG_IGN;
- if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
- PERROR("sigaction");
- return ret;
- }
-
- DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
-
- return ret;
-}
-
-/*
- * Set open files limit to unlimited. This daemon can open a large number of
- * file descriptors in order to consume multiple kernel traces.
- */
-static void set_ulimit(void)
-{
- int ret;
- struct rlimit lim;
-
- /* The kernel does not allow an infinite limit for open files */
- lim.rlim_cur = 65535;
- lim.rlim_max = 65535;
-
- ret = setrlimit(RLIMIT_NOFILE, &lim);
- if (ret < 0) {
- PERROR("failed to set open files limit");
- }
-}
-
-static int write_pidfile(void)
-{
- return utils_create_pid_file(getpid(), config.pid_file_path.value);
-}
-
-static int set_clock_plugin_env(void)
-{
- int ret = 0;
- char *env_value = NULL;
-
- if (!config.lttng_ust_clock_plugin.value) {
- goto end;
- }
-
- ret = asprintf(&env_value, "LTTNG_UST_CLOCK_PLUGIN=%s",
- config.lttng_ust_clock_plugin.value);
- if (ret < 0) {
- PERROR("asprintf");
- goto end;
- }
-
- ret = putenv(env_value);
- if (ret) {
- free(env_value);
- PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN");
- goto end;
- }
-
- DBG("Updated LTTNG_UST_CLOCK_PLUGIN environment variable to \"%s\"",
- config.lttng_ust_clock_plugin.value);
-end:
- return ret;
-}
-
-static void destroy_all_sessions_and_wait(void)
-{
- struct ltt_session *session, *tmp;
- struct ltt_session_list *session_list;
-
- session_list = session_get_list();
- DBG("Initiating destruction of all sessions");
-
- if (!session_list) {
- return;
- }
-
- session_lock_list();
- /* Initiate the destruction of all sessions. */
- cds_list_for_each_entry_safe(session, tmp,
- &session_list->head, list) {
- if (!session_get(session)) {
- continue;
- }
-
- session_lock(session);
- if (session->destroyed) {
- goto unlock_session;
- }
- (void) cmd_destroy_session(session,
- notification_thread_handle);
- unlock_session:
- session_unlock(session);
- session_put(session);
- }
- session_unlock_list();
-
- /* Wait for the destruction of all sessions to complete. */
- DBG("Waiting for the destruction of all sessions to complete");
- session_list_wait_empty();
- DBG("Destruction of all sessions completed");
-}
-
-/*
- * main
- */
-int main(int argc, char **argv)
-{
- int ret = 0, retval = 0;
- void *status;
- const char *env_app_timeout;
- struct lttng_pipe *ust32_channel_monitor_pipe = NULL,
- *ust64_channel_monitor_pipe = NULL,
- *kernel_channel_monitor_pipe = NULL;
- struct lttng_thread *ht_cleanup_thread = NULL;
- struct timer_thread_parameters timer_thread_parameters;
- /* Rotation thread handle. */
- struct rotation_thread_handle *rotation_thread_handle = NULL;
- /* Queue of rotation jobs populated by the sessiond-timer. */
- struct rotation_thread_timer_queue *rotation_timer_queue = NULL;
- struct lttng_thread *client_thread = NULL;
-
- init_kernel_workarounds();
-
- rcu_register_thread();
-
- if (set_signal_handler()) {
- retval = -1;
- goto exit_set_signal_handler;
- }
-
- if (timer_signal_init()) {
- retval = -1;
- goto exit_set_signal_handler;
- }
-
- page_size = sysconf(_SC_PAGESIZE);
- if (page_size < 0) {
- PERROR("sysconf _SC_PAGESIZE");
- page_size = LONG_MAX;
- WARN("Fallback page size to %ld", page_size);
- }
-
- ret = sessiond_config_init(&config);
- if (ret) {
- retval = -1;
- goto exit_set_signal_handler;
- }
-
- /*
- * Init config from environment variables.
- * Command line option override env configuration per-doc. Do env first.
- */
- sessiond_config_apply_env_config(&config);
-
- /*
- * Parse arguments and load the daemon configuration file.
- *
- * We have an exit_options exit path to free memory reserved by
- * set_options. This is needed because the rest of sessiond_cleanup()
- * depends on ht_cleanup_thread, which depends on lttng_daemonize, which
- * depends on set_options.
- */
- progname = argv[0];
- if (set_options(argc, argv)) {
- retval = -1;
- goto exit_options;
- }
-
- /*
- * Resolve all paths received as arguments, configuration option, or
- * through environment variable as absolute paths. This is necessary
- * since daemonizing causes the sessiond's current working directory
- * to '/'.
- */
- ret = sessiond_config_resolve_paths(&config);
- if (ret) {
- goto exit_options;
- }
-
- /* Apply config. */
- lttng_opt_verbose = config.verbose;
- lttng_opt_quiet = config.quiet;
- kconsumer_data.err_unix_sock_path =
- config.kconsumerd_err_unix_sock_path.value;
- kconsumer_data.cmd_unix_sock_path =
- config.kconsumerd_cmd_unix_sock_path.value;
- ustconsumer32_data.err_unix_sock_path =
- config.consumerd32_err_unix_sock_path.value;
- ustconsumer32_data.cmd_unix_sock_path =
- config.consumerd32_cmd_unix_sock_path.value;
- ustconsumer64_data.err_unix_sock_path =
- config.consumerd64_err_unix_sock_path.value;
- ustconsumer64_data.cmd_unix_sock_path =
- config.consumerd64_cmd_unix_sock_path.value;
- set_clock_plugin_env();
-
- sessiond_config_log(&config);
-
- if (create_lttng_rundir()) {
- retval = -1;
- goto exit_options;
- }
-
- /* Abort launch if a session daemon is already running. */
- if (check_existing_daemon()) {
- ERR("A session daemon is already running.");
- retval = -1;
- goto exit_options;
- }
-
- /* Daemonize */
- if (config.daemonize || config.background) {
- int i;
-
- ret = lttng_daemonize(&child_ppid, &recv_child_signal,
- !config.background);
- if (ret < 0) {
- retval = -1;
- goto exit_options;
- }
-
- /*
- * We are in the child. Make sure all other file descriptors are
- * closed, in case we are called with more opened file
- * descriptors than the standard ones and the lock file.
- */
- for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
- if (i == lockfile_fd) {
- continue;
- }
- (void) close(i);
- }
- }
-
- if (run_as_create_worker(argv[0]) < 0) {
- goto exit_create_run_as_worker_cleanup;
- }
-
- /*
- * Starting from here, we can create threads. This needs to be after
- * lttng_daemonize due to RCU.
- */
-
- /*
- * Initialize the health check subsystem. This call should set the
- * appropriate time values.
- */
- health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES);
- if (!health_sessiond) {
- PERROR("health_app_create error");
- retval = -1;
- goto exit_health_sessiond_cleanup;
- }
-
- /* Create thread to clean up RCU hash tables */
- ht_cleanup_thread = launch_ht_cleanup_thread();
- if (!ht_cleanup_thread) {
- retval = -1;
- goto exit_ht_cleanup;
- }
-
- /* Create thread quit pipe */
- if (sessiond_init_thread_quit_pipe()) {
- retval = -1;
- goto exit_init_data;
- }
-
- /* Check if daemon is UID = 0 */
- is_root = !getuid();
- if (is_root) {
- /* Create global run dir with root access */
-
- kernel_channel_monitor_pipe = lttng_pipe_open(0);
- if (!kernel_channel_monitor_pipe) {
- ERR("Failed to create kernel consumer channel monitor pipe");
- retval = -1;
- goto exit_init_data;
- }
- kconsumer_data.channel_monitor_pipe =
- lttng_pipe_release_writefd(
- kernel_channel_monitor_pipe);
- if (kconsumer_data.channel_monitor_pipe < 0) {
- retval = -1;
- goto exit_init_data;
- }
- }
-
- /* Set consumer initial state */
- kernel_consumerd_state = CONSUMER_STOPPED;
- ust_consumerd_state = CONSUMER_STOPPED;
-
- ust32_channel_monitor_pipe = lttng_pipe_open(0);
- if (!ust32_channel_monitor_pipe) {
- ERR("Failed to create 32-bit user space consumer channel monitor pipe");
- retval = -1;
- goto exit_init_data;
- }
- ustconsumer32_data.channel_monitor_pipe = lttng_pipe_release_writefd(
- ust32_channel_monitor_pipe);
- if (ustconsumer32_data.channel_monitor_pipe < 0) {
- retval = -1;
- goto exit_init_data;
- }
-
- /*
- * The rotation_thread_timer_queue structure is shared between the
- * sessiond timer thread and the rotation thread. The main thread keeps
- * its ownership and destroys it when both threads have been joined.
- */
- rotation_timer_queue = rotation_thread_timer_queue_create();
- if (!rotation_timer_queue) {
- retval = -1;
- goto exit_init_data;
- }
- timer_thread_parameters.rotation_thread_job_queue =
- rotation_timer_queue;
-
- ust64_channel_monitor_pipe = lttng_pipe_open(0);
- if (!ust64_channel_monitor_pipe) {
- ERR("Failed to create 64-bit user space consumer channel monitor pipe");
- retval = -1;
- goto exit_init_data;
- }
- ustconsumer64_data.channel_monitor_pipe = lttng_pipe_release_writefd(
- ust64_channel_monitor_pipe);
- if (ustconsumer64_data.channel_monitor_pipe < 0) {
- retval = -1;
- goto exit_init_data;
- }
-
- /*
- * Init UST app hash table. Alloc hash table before this point since
- * cleanup() can get called after that point.
- */
- if (ust_app_ht_alloc()) {
- ERR("Failed to allocate UST app hash table");
- retval = -1;
- goto exit_init_data;
- }
-
- /*
- * Initialize agent app hash table. We allocate the hash table here
- * since cleanup() can get called after this point.
- */
- if (agent_app_ht_alloc()) {
- ERR("Failed to allocate Agent app hash table");
- retval = -1;
- goto exit_init_data;
- }
-
- /*
- * These actions must be executed as root. We do that *after* setting up
- * the sockets path because we MUST make the check for another daemon using
- * those paths *before* trying to set the kernel consumer sockets and init
- * kernel tracer.
- */
- if (is_root) {
- if (set_consumer_sockets(&kconsumer_data)) {
- retval = -1;
- goto exit_init_data;
- }
-
- /* Setup kernel tracer */
- if (!config.no_kernel) {
- init_kernel_tracer();
- if (kernel_tracer_fd >= 0) {
- ret = syscall_init_table();
- if (ret < 0) {
- ERR("Unable to populate syscall table. "
- "Syscall tracing won't work "
- "for this session daemon.");
- }
- }
- }
-
- /* Set ulimit for open files */
- set_ulimit();
- }
- /* init lttng_fd tracking must be done after set_ulimit. */
- lttng_fd_init();
-
- if (set_consumer_sockets(&ustconsumer64_data)) {
- retval = -1;
- goto exit_init_data;
- }
-
- if (set_consumer_sockets(&ustconsumer32_data)) {
- retval = -1;
- goto exit_init_data;
- }
-
- /* Setup the needed unix socket */
- if (init_daemon_socket()) {
- retval = -1;
- goto exit_init_data;
- }
-
- /* Set credentials to socket */
- if (is_root && set_permissions(config.rundir.value)) {
- retval = -1;
- goto exit_init_data;
- }
-
- /* Get parent pid if -S, --sig-parent is specified. */
- if (config.sig_parent) {
- ppid = getppid();
- }
-
- /* Setup the kernel pipe for waking up the kernel thread */
- if (is_root && !config.no_kernel) {
- if (utils_create_pipe_cloexec(kernel_poll_pipe)) {
- retval = -1;
- goto exit_init_data;
- }
- }
-
- /* Setup the thread apps communication pipe. */
- if (utils_create_pipe_cloexec(apps_cmd_pipe)) {
- retval = -1;
- goto exit_init_data;
- }
-
- /* Setup the thread apps notify communication pipe. */
- if (utils_create_pipe_cloexec(apps_cmd_notify_pipe)) {
- retval = -1;
- goto exit_init_data;
- }
-
- /* Initialize global buffer per UID and PID registry. */
- buffer_reg_init_uid_registry();
- buffer_reg_init_pid_registry();
-
- /* Init UST command queue. */
- cds_wfcq_init(&ust_cmd_queue.head, &ust_cmd_queue.tail);
-
- cmd_init();
-
- /* Check for the application socket timeout env variable. */
- env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV);
- if (env_app_timeout) {
- config.app_socket_timeout = atoi(env_app_timeout);
- } else {
- config.app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT;
- }
-
- ret = write_pidfile();
- if (ret) {
- ERR("Error in write_pidfile");
- retval = -1;
- goto exit_init_data;
- }
-
- /* Initialize communication library */
- lttcomm_init();
- /* Initialize TCP timeout values */
- lttcomm_inet_init();
-
- if (load_session_init_data(&load_info) < 0) {
- retval = -1;
- goto exit_init_data;
- }
- load_info->path = config.load_session_path.value;
-
- /* Create health-check thread. */
- if (!launch_health_management_thread()) {
- retval = -1;
- goto exit_health;
- }
-
- /* notification_thread_data acquires the pipes' read side. */
- notification_thread_handle = notification_thread_handle_create(
- ust32_channel_monitor_pipe,
- ust64_channel_monitor_pipe,
- kernel_channel_monitor_pipe);
- if (!notification_thread_handle) {
- retval = -1;
- ERR("Failed to create notification thread shared data");
- goto exit_notification;
- }
-
- /* Create notification thread. */
- if (!launch_notification_thread(notification_thread_handle)) {
- retval = -1;
- goto exit_notification;
- }
-
- /* Create timer thread. */
- if (!launch_timer_thread(&timer_thread_parameters)) {
- retval = -1;
- goto exit_notification;
- }
-
- /* rotation_thread_data acquires the pipes' read side. */
- rotation_thread_handle = rotation_thread_handle_create(
- rotation_timer_queue,
- notification_thread_handle);
- if (!rotation_thread_handle) {
- retval = -1;
- ERR("Failed to create rotation thread shared data");
- stop_threads();
- goto exit_rotation;
- }
-
- /* Create rotation thread. */
- if (!launch_rotation_thread(rotation_thread_handle)) {
- retval = -1;
- goto exit_rotation;
- }
-
- /* Create thread to manage the client socket */
- client_thread = launch_client_thread();
- if (!client_thread) {
- retval = -1;
- goto exit_client;
- }
-
- /* Create thread to dispatch registration */
- ret = pthread_create(&dispatch_thread, default_pthread_attr(),
- thread_dispatch_ust_registration, (void *) NULL);
- if (ret) {
- errno = ret;
- PERROR("pthread_create dispatch");
- retval = -1;
- stop_threads();
- goto exit_dispatch;
- }
-
- /* Create thread to manage application registration. */
- ret = pthread_create(®_apps_thread, default_pthread_attr(),
- thread_registration_apps, (void *) NULL);
- if (ret) {
- errno = ret;
- PERROR("pthread_create registration");
- retval = -1;
- stop_threads();
- goto exit_reg_apps;
- }
-
- /* Create thread to manage application socket */
- ret = pthread_create(&apps_thread, default_pthread_attr(),
- thread_manage_apps, (void *) NULL);
- if (ret) {
- errno = ret;
- PERROR("pthread_create apps");
- retval = -1;
- stop_threads();
- goto exit_apps;
- }
-
- /* Create thread to manage application notify socket */
- ret = pthread_create(&apps_notify_thread, default_pthread_attr(),
- ust_thread_manage_notify, (void *) NULL);
- if (ret) {
- errno = ret;
- PERROR("pthread_create notify");
- retval = -1;
- stop_threads();
- goto exit_apps_notify;
- }
-
- /* Create agent registration thread. */
- ret = pthread_create(&agent_reg_thread, default_pthread_attr(),
- agent_thread_manage_registration, (void *) NULL);
- if (ret) {
- errno = ret;
- PERROR("pthread_create agent");
- retval = -1;
- stop_threads();
- goto exit_agent_reg;
- }
-
- /* Don't start this thread if kernel tracing is not requested nor root */
- if (is_root && !config.no_kernel) {
- /* Create kernel thread to manage kernel event */
- ret = pthread_create(&kernel_thread, default_pthread_attr(),
- thread_manage_kernel, (void *) NULL);
- if (ret) {
- errno = ret;
- PERROR("pthread_create kernel");
- retval = -1;
- stop_threads();
- goto exit_kernel;
- }
- }
-
- /* Create session loading thread. */
- ret = pthread_create(&load_session_thread, default_pthread_attr(),
- thread_load_session, load_info);
- if (ret) {
- errno = ret;
- PERROR("pthread_create load_session_thread");
- retval = -1;
- stop_threads();
- goto exit_load_session;
- }
-
- /*
- * This is where we start awaiting program completion (e.g. through
- * signal that asks threads to teardown).
- */
-
- ret = pthread_join(load_session_thread, &status);
- if (ret) {
- errno = ret;
- PERROR("pthread_join load_session_thread");
- retval = -1;
- }
-
- /* Initiate teardown once activity occurs on the quit pipe. */
- sessiond_wait_for_quit_pipe(-1U);
-
- /*
- * Ensure that the client thread is no longer accepting new commands,
- * which could cause new sessions to be created.
- */
- if (!lttng_thread_shutdown(client_thread)) {
- ERR("Failed to shutdown the client thread, continuing teardown");
- lttng_thread_put(client_thread);
- client_thread = NULL;
- }
-
- destroy_all_sessions_and_wait();
-exit_load_session:
-
- if (is_root && !config.no_kernel) {
- ret = pthread_join(kernel_thread, &status);
- if (ret) {
- errno = ret;
- PERROR("pthread_join");
- retval = -1;
- }
- }
-exit_kernel:
-
- ret = pthread_join(agent_reg_thread, &status);
- if (ret) {
- errno = ret;
- PERROR("pthread_join agent");
- retval = -1;
- }
-exit_agent_reg:
-
- ret = pthread_join(apps_notify_thread, &status);
- if (ret) {
- errno = ret;
- PERROR("pthread_join apps notify");
- retval = -1;
- }
-exit_apps_notify:
-
- ret = pthread_join(apps_thread, &status);
- if (ret) {
- errno = ret;
- PERROR("pthread_join apps");
- retval = -1;
- }
-exit_apps:
-
- ret = pthread_join(reg_apps_thread, &status);
- if (ret) {
- errno = ret;
- PERROR("pthread_join");
- retval = -1;
- }
-exit_reg_apps:
-
- /*
- * Join dispatch thread after joining reg_apps_thread to ensure
- * we don't leak applications in the queue.
- */
- ret = pthread_join(dispatch_thread, &status);
- if (ret) {
- errno = ret;
- PERROR("pthread_join");
- retval = -1;
- }
-exit_dispatch:
-exit_client:
-exit_rotation:
-exit_notification:
- lttng_thread_list_shutdown_orphans();
-exit_health:
-exit_init_data:
- if (client_thread) {
- lttng_thread_put(client_thread);
- }
-
- /*
- * Wait for all pending call_rcu work to complete before tearing
- * down data structures. call_rcu worker may be trying to
- * perform lookups in those structures.
- */
- rcu_barrier();
- /*
- * sessiond_cleanup() is called when no other thread is running, except
- * the ht_cleanup thread, which is needed to destroy the hash tables.
- */
- rcu_thread_online();
- sessiond_cleanup();
-
- /*
- * Ensure all prior call_rcu are done. call_rcu callbacks may push
- * hash tables to the ht_cleanup thread. Therefore, we ensure that
- * the queue is empty before shutting down the clean-up thread.
- */
- rcu_barrier();
-
- if (ht_cleanup_thread) {
- lttng_thread_shutdown(ht_cleanup_thread);
- lttng_thread_put(ht_cleanup_thread);
- }
-
- rcu_thread_offline();
- rcu_unregister_thread();
-
- if (rotation_thread_handle) {
- rotation_thread_handle_destroy(rotation_thread_handle);
- }
-
- /*
- * After the rotation and timer thread have quit, we can safely destroy
- * the rotation_timer_queue.
- */
- rotation_thread_timer_queue_destroy(rotation_timer_queue);
- /*
- * The teardown of the notification system is performed after the
- * session daemon's teardown in order to allow it to be notified
- * of the active session and channels at the moment of the teardown.
- */
- if (notification_thread_handle) {
- notification_thread_handle_destroy(notification_thread_handle);
- }
- lttng_pipe_destroy(ust32_channel_monitor_pipe);
- lttng_pipe_destroy(ust64_channel_monitor_pipe);
- lttng_pipe_destroy(kernel_channel_monitor_pipe);
-exit_ht_cleanup:
-
- health_app_destroy(health_sessiond);
-exit_health_sessiond_cleanup:
-exit_create_run_as_worker_cleanup:
-
-exit_options:
- sessiond_cleanup_lock_file();
- sessiond_cleanup_options();
-
-exit_set_signal_handler:
- if (!retval) {
- exit(EXIT_SUCCESS);
- } else {
- exit(EXIT_FAILURE);
- }
-}
projects / lttng-tools.git / blobdiff