+++ /dev/null
-/*
- * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
- * David Goulet <dgoulet@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 _GNU_SOURCE
-#include <getopt.h>
-#include <grp.h>
-#include <limits.h>
-#include <pthread.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.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 <inttypes.h>
-#include <urcu/futex.h>
-#include <urcu/uatomic.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <config.h>
-
-#include <lttng/lttng.h>
-#include <common/common.h>
-#include <common/compat/poll.h>
-#include <common/compat/socket.h>
-#include <common/defaults.h>
-#include <common/futex.h>
-#include <common/sessiond-comm/sessiond-comm.h>
-#include <common/sessiond-comm/inet.h>
-#include <common/sessiond-comm/relayd.h>
-#include <common/uri.h>
-#include <common/utils.h>
-
-#include "cmd.h"
-#include "live.h"
-#include "lttng-relayd.h"
-#include "lttng-viewer.h"
-#include "utils.h"
-#include "health-relayd.h"
-
-static struct lttng_uri *live_uri;
-
-/*
- * Quit pipe for all threads. This permits a single cancellation point
- * for all threads when receiving an event on the pipe.
- */
-static int live_thread_quit_pipe[2] = { -1, -1 };
-
-/*
- * This pipe is used to inform the worker thread that a command is queued and
- * ready to be processed.
- */
-static int live_relay_cmd_pipe[2] = { -1, -1 };
-
-/* Shared between threads */
-static int live_dispatch_thread_exit;
-
-static pthread_t live_listener_thread;
-static pthread_t live_dispatcher_thread;
-static pthread_t live_worker_thread;
-
-/*
- * Relay command queue.
- *
- * The live_thread_listener and live_thread_dispatcher communicate with this
- * queue.
- */
-static struct relay_cmd_queue viewer_cmd_queue;
-
-static uint64_t last_relay_viewer_session_id;
-
-/*
- * Cleanup the daemon
- */
-static
-void cleanup(void)
-{
- DBG("Cleaning up");
-
- free(live_uri);
-}
-
-/*
- * Write to writable pipe used to notify a thread.
- */
-static
-int notify_thread_pipe(int wpipe)
-{
- ssize_t ret;
-
- ret = lttng_write(wpipe, "!", 1);
- if (ret < 1) {
- PERROR("write poll pipe");
- }
-
- return (int) ret;
-}
-
-/*
- * Stop all threads by closing the thread quit pipe.
- */
-static
-void stop_threads(void)
-{
- int ret;
-
- /* Stopping all threads */
- DBG("Terminating all live threads");
- ret = notify_thread_pipe(live_thread_quit_pipe[1]);
- if (ret < 0) {
- ERR("write error on thread quit pipe");
- }
-
- /* Dispatch thread */
- CMM_STORE_SHARED(live_dispatch_thread_exit, 1);
- futex_nto1_wake(&viewer_cmd_queue.futex);
-}
-
-/*
- * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
- */
-static
-int create_thread_poll_set(struct lttng_poll_event *events, int size)
-{
- int ret;
-
- if (events == NULL || size == 0) {
- ret = -1;
- goto error;
- }
-
- ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
- if (ret < 0) {
- goto error;
- }
-
- /* Add quit pipe */
- ret = lttng_poll_add(events, live_thread_quit_pipe[0], LPOLLIN);
- if (ret < 0) {
- goto error;
- }
-
- return 0;
-
-error:
- return ret;
-}
-
-/*
- * Check if the thread quit pipe was triggered.
- *
- * Return 1 if it was triggered else 0;
- */
-static
-int check_thread_quit_pipe(int fd, uint32_t events)
-{
- if (fd == live_thread_quit_pipe[0] && (events & LPOLLIN)) {
- return 1;
- }
-
- return 0;
-}
-
-/*
- * Create and init socket from uri.
- */
-static
-struct lttcomm_sock *init_socket(struct lttng_uri *uri)
-{
- int ret;
- struct lttcomm_sock *sock = NULL;
-
- sock = lttcomm_alloc_sock_from_uri(uri);
- if (sock == NULL) {
- ERR("Allocating socket");
- goto error;
- }
-
- ret = lttcomm_create_sock(sock);
- if (ret < 0) {
- goto error;
- }
- DBG("Listening on sock %d for live", sock->fd);
-
- ret = sock->ops->bind(sock);
- if (ret < 0) {
- goto error;
- }
-
- ret = sock->ops->listen(sock, -1);
- if (ret < 0) {
- goto error;
-
- }
-
- return sock;
-
-error:
- if (sock) {
- lttcomm_destroy_sock(sock);
- }
- return NULL;
-}
-
-/*
- * This thread manages the listening for new connections on the network
- */
-static
-void *thread_listener(void *data)
-{
- int i, ret, pollfd, err = -1;
- int val = 1;
- uint32_t revents, nb_fd;
- struct lttng_poll_event events;
- struct lttcomm_sock *live_control_sock;
-
- DBG("[thread] Relay live listener started");
-
- health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER);
-
- health_code_update();
-
- live_control_sock = init_socket(live_uri);
- if (!live_control_sock) {
- goto error_sock_control;
- }
-
- /*
- * Pass 3 as size here for the thread quit pipe, control and data socket.
- */
- ret = create_thread_poll_set(&events, 2);
- if (ret < 0) {
- goto error_create_poll;
- }
-
- /* Add the control socket */
- ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP);
- if (ret < 0) {
- goto error_poll_add;
- }
-
- while (1) {
- health_code_update();
-
- DBG("Listener accepting live viewers connections");
-
-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;
-
- DBG("Relay new viewer connection received");
- 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);
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = check_thread_quit_pipe(pollfd, revents);
- if (ret) {
- err = 0;
- goto exit;
- }
-
- if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("socket poll error");
- goto error;
- } else if (revents & LPOLLIN) {
- /*
- * Get allocated in this thread, enqueued to a global queue,
- * dequeued and freed in the worker thread.
- */
- struct relay_command *relay_cmd;
- struct lttcomm_sock *newsock;
-
- relay_cmd = zmalloc(sizeof(*relay_cmd));
- if (!relay_cmd) {
- PERROR("relay command zmalloc");
- goto error;
- }
-
- assert(pollfd == live_control_sock->fd);
- newsock = live_control_sock->ops->accept(live_control_sock);
- if (!newsock) {
- PERROR("accepting control sock");
- free(relay_cmd);
- goto error;
- }
- DBG("Relay viewer connection accepted socket %d", newsock->fd);
- ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val,
- sizeof(int));
- if (ret < 0) {
- PERROR("setsockopt inet");
- lttcomm_destroy_sock(newsock);
- free(relay_cmd);
- goto error;
- }
- relay_cmd->sock = newsock;
-
- /*
- * Lock free enqueue the request.
- */
- cds_wfq_enqueue(&viewer_cmd_queue.queue, &relay_cmd->node);
-
- /*
- * Wake the dispatch queue futex. Implicit memory
- * barrier with the exchange in cds_wfq_enqueue.
- */
- futex_nto1_wake(&viewer_cmd_queue.futex);
- }
- }
- }
-
-exit:
-error:
-error_poll_add:
- lttng_poll_clean(&events);
-error_create_poll:
- if (live_control_sock->fd >= 0) {
- ret = live_control_sock->ops->close(live_control_sock);
- if (ret) {
- PERROR("close");
- }
- }
- lttcomm_destroy_sock(live_control_sock);
-error_sock_control:
- if (err) {
- health_error();
- DBG("Live viewer listener thread exited with error");
- }
- health_unregister(health_relayd);
- DBG("Live viewer listener thread cleanup complete");
- stop_threads();
- return NULL;
-}
-
-/*
- * This thread manages the dispatching of the requests to worker threads
- */
-static
-void *thread_dispatcher(void *data)
-{
- int err = -1;
- ssize_t ret;
- struct cds_wfq_node *node;
- struct relay_command *relay_cmd = NULL;
-
- DBG("[thread] Live viewer relay dispatcher started");
-
- health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER);
-
- health_code_update();
-
- while (!CMM_LOAD_SHARED(live_dispatch_thread_exit)) {
- health_code_update();
-
- /* Atomically prepare the queue futex */
- futex_nto1_prepare(&viewer_cmd_queue.futex);
-
- do {
- health_code_update();
-
- /* Dequeue commands */
- node = cds_wfq_dequeue_blocking(&viewer_cmd_queue.queue);
- if (node == NULL) {
- DBG("Woken up but nothing in the live-viewer "
- "relay command queue");
- /* Continue thread execution */
- break;
- }
-
- relay_cmd = caa_container_of(node, struct relay_command, node);
- DBG("Dispatching viewer request waiting on sock %d",
- relay_cmd->sock->fd);
-
- /*
- * Inform worker thread of the new request. This call is blocking
- * so we can be assured that the data will be read at some point in
- * time or wait to the end of the world :)
- */
- ret = lttng_write(live_relay_cmd_pipe[1], relay_cmd,
- sizeof(*relay_cmd));
- free(relay_cmd);
- if (ret < sizeof(struct relay_command)) {
- PERROR("write cmd pipe");
- goto error;
- }
- } while (node != NULL);
-
- /* Futex wait on queue. Blocking call on futex() */
- health_poll_entry();
- futex_nto1_wait(&viewer_cmd_queue.futex);
- health_poll_exit();
- }
-
- /* Normal exit, no error */
- err = 0;
-
-error:
- if (err) {
- health_error();
- ERR("Health error occurred in %s", __func__);
- }
- health_unregister(health_relayd);
- DBG("Live viewer dispatch thread dying");
- stop_threads();
- return NULL;
-}
-
-/*
- * Establish connection with the viewer and check the versions.
- *
- * Return 0 on success or else negative value.
- */
-static
-int viewer_connect(struct relay_command *cmd)
-{
- int ret;
- struct lttng_viewer_connect reply, msg;
-
- assert(cmd);
-
- cmd->version_check_done = 1;
-
- health_code_update();
-
- /* Get version from the other side. */
- ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0);
- if (ret < 0 || ret != sizeof(msg)) {
- if (ret == 0) {
- /* Orderly shutdown. Not necessary to print an error. */
- DBG("Socket %d did an orderly shutdown", cmd->sock->fd);
- } else {
- ERR("Relay failed to receive the version values.");
- }
- ret = -1;
- goto end;
- }
-
- health_code_update();
-
- reply.major = RELAYD_VERSION_COMM_MAJOR;
- reply.minor = RELAYD_VERSION_COMM_MINOR;
-
- /* Major versions must be the same */
- if (reply.major != be32toh(msg.major)) {
- DBG("Incompatible major versions (%u vs %u)", reply.major,
- be32toh(msg.major));
- ret = 0;
- goto end;
- }
-
- cmd->major = reply.major;
- /* We adapt to the lowest compatible version */
- if (reply.minor <= be32toh(msg.minor)) {
- cmd->minor = reply.minor;
- } else {
- cmd->minor = be32toh(msg.minor);
- }
-
- if (be32toh(msg.type) == VIEWER_CLIENT_COMMAND) {
- cmd->type = RELAY_VIEWER_COMMAND;
- } else if (be32toh(msg.type) == VIEWER_CLIENT_NOTIFICATION) {
- cmd->type = RELAY_VIEWER_NOTIFICATION;
- } else {
- ERR("Unknown connection type : %u", be32toh(msg.type));
- ret = -1;
- goto end;
- }
-
- reply.major = htobe32(reply.major);
- reply.minor = htobe32(reply.minor);
- if (cmd->type == RELAY_VIEWER_COMMAND) {
- reply.viewer_session_id = htobe64(++last_relay_viewer_session_id);
- }
-
- health_code_update();
-
- ret = cmd->sock->ops->sendmsg(cmd->sock, &reply,
- sizeof(struct lttng_viewer_connect), 0);
- if (ret < 0) {
- ERR("Relay sending version");
- }
-
- health_code_update();
-
- DBG("Version check done using protocol %u.%u", cmd->major, cmd->minor);
- ret = 0;
-
-end:
- return ret;
-}
-
-/*
- * Send the viewer the list of current sessions.
- *
- * Return 0 on success or else a negative value.
- */
-static
-int viewer_list_sessions(struct relay_command *cmd,
- struct lttng_ht *sessions_ht)
-{
- int ret;
- struct lttng_viewer_list_sessions session_list;
- unsigned long count;
- long approx_before, approx_after;
- struct lttng_ht_node_ulong *node;
- struct lttng_ht_iter iter;
- struct lttng_viewer_session send_session;
- struct relay_session *session;
-
- DBG("List sessions received");
-
- if (cmd->version_check_done == 0) {
- ERR("Trying to list sessions before version check");
- ret = -1;
- goto end_no_session;
- }
-
- rcu_read_lock();
- cds_lfht_count_nodes(sessions_ht->ht, &approx_before, &count, &approx_after);
- session_list.sessions_count = htobe32(count);
-
- health_code_update();
-
- ret = cmd->sock->ops->sendmsg(cmd->sock, &session_list,
- sizeof(session_list), 0);
- if (ret < 0) {
- ERR("Relay sending sessions list");
- goto end_unlock;
- }
-
- health_code_update();
-
- cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, node, node) {
- health_code_update();
-
- node = lttng_ht_iter_get_node_ulong(&iter);
- if (!node) {
- goto end_unlock;
- }
- session = caa_container_of(node, struct relay_session, session_n);
-
- strncpy(send_session.session_name, session->session_name,
- sizeof(send_session.session_name));
- strncpy(send_session.hostname, session->hostname,
- sizeof(send_session.hostname));
- send_session.id = htobe64(session->id);
- send_session.live_timer = htobe32(session->live_timer);
- send_session.clients = htobe32(session->viewer_attached);
- send_session.streams = htobe32(session->stream_count);
-
- health_code_update();
-
- ret = cmd->sock->ops->sendmsg(cmd->sock, &send_session,
- sizeof(send_session), 0);
- if (ret < 0) {
- ERR("Relay sending session info");
- goto end_unlock;
- }
- }
- health_code_update();
-
- rcu_read_unlock();
- ret = 0;
- goto end;
-
-end_unlock:
- rcu_read_unlock();
-
-end:
-end_no_session:
- return ret;
-}
-
-/*
- * Open index file using a given viewer stream.
- *
- * Return 0 on success or else a negative value.
- */
-static int open_index(struct relay_viewer_stream *stream)
-{
- int ret;
- char fullpath[PATH_MAX];
- struct lttng_packet_index_file_hdr hdr;
-
- if (stream->tracefile_size > 0) {
- /* For now we don't support on-disk ring buffer. */
- ret = -1;
- goto end;
- }
-
- ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR "/%s"
- DEFAULT_INDEX_FILE_SUFFIX, stream->path_name,
- stream->channel_name);
- if (ret < 0) {
- PERROR("snprintf index path");
- goto error;
- }
-
- DBG("Opening index file %s in read only", fullpath);
- ret = open(fullpath, O_RDONLY);
- if (ret < 0) {
- if (errno == ENOENT) {
- ret = -ENOENT;
- goto error;
- } else {
- PERROR("opening index in read-only");
- }
- goto error;
- }
- stream->index_read_fd = ret;
- DBG("Opening index file %s in read only, (fd: %d)", fullpath, ret);
-
- ret = lttng_read(stream->index_read_fd, &hdr, sizeof(hdr));
- if (ret < sizeof(hdr)) {
- PERROR("Reading index header");
- goto error;
- }
- if (strncmp(hdr.magic, INDEX_MAGIC, sizeof(hdr.magic)) != 0) {
- ERR("Invalid header magic");
- ret = -1;
- goto error;
- }
- if (be32toh(hdr.index_major) != INDEX_MAJOR ||
- be32toh(hdr.index_minor) != INDEX_MINOR) {
- ERR("Invalid header version");
- ret = -1;
- goto error;
- }
- ret = 0;
-
-error:
-end:
- return ret;
-}
-
-/*
- * Allocate and init a new viewer_stream.
- *
- * Copies the values from the stream passed in parameter and insert the new
- * stream in the viewer_streams_ht.
- *
- * MUST be called with rcu_read_lock held.
- *
- * Returns 0 on success or a negative value on error.
- */
-static
-int init_viewer_stream(struct relay_stream *stream, int seek_last)
-{
- int ret;
- struct relay_viewer_stream *viewer_stream;
-
- assert(stream);
-
- viewer_stream = zmalloc(sizeof(*viewer_stream));
- if (!viewer_stream) {
- PERROR("relay viewer stream zmalloc");
- ret = -1;
- goto error;
- }
-
- viewer_stream->read_fd = -1;
- viewer_stream->index_read_fd = -1;
- viewer_stream->session_id = stream->session->id;
- viewer_stream->stream_handle = stream->stream_handle;
- viewer_stream->path_name = strndup(stream->path_name,
- LTTNG_VIEWER_PATH_MAX);
- viewer_stream->channel_name = strndup(stream->channel_name,
- LTTNG_VIEWER_NAME_MAX);
- viewer_stream->total_index_received = stream->total_index_received;
- viewer_stream->tracefile_size = stream->tracefile_size;
- viewer_stream->tracefile_count = stream->tracefile_count;
- viewer_stream->metadata_flag = stream->metadata_flag;
-
- if (seek_last && viewer_stream->total_index_received > 0) {
- ret = open_index(viewer_stream);
- if (ret < 0) {
- goto error;
- }
- ret = lseek(viewer_stream->index_read_fd,
- viewer_stream->total_index_received *
- sizeof(struct lttng_packet_index),
- SEEK_CUR);
- if (ret < 0) {
- goto error;
- }
- viewer_stream->last_sent_index =
- viewer_stream->total_index_received;
- }
-
- /*
- * This is to avoid a race between the initialization of this object and
- * the close of the given stream. If the stream is unable to find this
- * viewer stream when closing, this copy will at least take the latest
- * value.
- */
- viewer_stream->total_index_received = stream->total_index_received;
-
- /*
- * The deletion of this ctf_trace object is only done in a call RCU of the
- * relay stream making it valid as long as we have the read side lock.
- */
- viewer_stream->ctf_trace = stream->ctf_trace;
- uatomic_inc(&viewer_stream->ctf_trace->refcount);
-
- lttng_ht_node_init_u64(&viewer_stream->stream_n, stream->stream_handle);
- lttng_ht_add_unique_u64(viewer_streams_ht, &viewer_stream->stream_n);
-
- ret = 0;
-
-error:
- return ret;
-}
-
-/*
- * Send the viewer the list of current sessions.
- */
-static
-int viewer_attach_session(struct relay_command *cmd,
- struct lttng_ht *sessions_ht)
-{
- int ret, send_streams = 0, nb_streams = 0;
- struct lttng_viewer_attach_session_request request;
- struct lttng_viewer_attach_session_response response;
- struct lttng_viewer_stream send_stream;
- struct relay_stream *stream;
- struct relay_viewer_stream *viewer_stream;
- struct lttng_ht_node_ulong *node;
- struct lttng_ht_node_u64 *node64;
- struct lttng_ht_iter iter;
- struct relay_session *session;
- int seek_last = 0;
-
- assert(cmd);
- assert(sessions_ht);
-
- DBG("Attach session received");
-
- if (cmd->version_check_done == 0) {
- ERR("Trying to attach session before version check");
- ret = -1;
- goto end_no_session;
- }
-
- health_code_update();
-
- ret = cmd->sock->ops->recvmsg(cmd->sock, &request, sizeof(request), 0);
- if (ret < 0 || ret != sizeof(request)) {
- if (ret == 0) {
- /* Orderly shutdown. Not necessary to print an error. */
- DBG("Socket %d did an orderly shutdown", cmd->sock->fd);
- } else {
- ERR("Relay failed to receive the attach parameters.");
- }
- ret = -1;
- goto error;
- }
-
- health_code_update();
-
- rcu_read_lock();
- lttng_ht_lookup(sessions_ht,
- (void *)((unsigned long) be64toh(request.session_id)), &iter);
- node = lttng_ht_iter_get_node_ulong(&iter);
- if (node == NULL) {
- DBG("Relay session %" PRIu64 " not found",
- be64toh(request.session_id));
- response.status = htobe32(VIEWER_ATTACH_UNK);
- goto send_reply;
- }
-
- session = caa_container_of(node, struct relay_session, session_n);
- if (cmd->session_id == session->id) {
- /* Same viewer already attached, just send the stream list. */
- send_streams = 1;
- response.status = htobe32(VIEWER_ATTACH_OK);
- } else if (session->viewer_attached != 0) {
- DBG("Already a viewer attached");
- response.status = htobe32(VIEWER_ATTACH_ALREADY);
- goto send_reply;
- } else if (session->live_timer == 0) {
- DBG("Not live session");
- response.status = htobe32(VIEWER_ATTACH_NOT_LIVE);
- goto send_reply;
- } else {
- session->viewer_attached++;
- send_streams = 1;
- response.status = htobe32(VIEWER_ATTACH_OK);
- cmd->session_id = session->id;
- cmd->session = session;
- }
-
- switch (be32toh(request.seek)) {
- case VIEWER_SEEK_BEGINNING:
- /* Default behaviour. */
- break;
- case VIEWER_SEEK_LAST:
- seek_last = 1;
- break;
- default:
- ERR("Wrong seek parameter");
- response.status = htobe32(VIEWER_ATTACH_SEEK_ERR);
- send_streams = 0;
- goto send_reply;
- }
-
- if (send_streams) {
- /* We should only be there if we have a session to attach to. */
- assert(session);
-
- /*
- * Fill the viewer_streams_ht to count the number of streams
- * ready to be sent and avoid concurrency issues on the
- * relay_streams_ht and don't rely on a total session stream count.
- */
- cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, node, node) {
- struct relay_viewer_stream *vstream;
-
- health_code_update();
-
- node = lttng_ht_iter_get_node_ulong(&iter);
- if (!node) {
- continue;
- }
- stream = caa_container_of(node, struct relay_stream, stream_n);
- if (stream->session != cmd->session) {
- continue;
- }
-
- /*
- * Don't send streams with no ctf_trace, they are not ready to be
- * read.
- */
- if (!stream->ctf_trace) {
- continue;
- }
-
- vstream = live_find_viewer_stream_by_id(stream->stream_handle);
- if (!vstream) {
- ret = init_viewer_stream(stream, seek_last);
- if (ret < 0) {
- goto end_unlock;
- }
- }
- nb_streams++;
- }
- response.streams_count = htobe32(nb_streams);
- }
-
-send_reply:
- health_code_update();
- ret = cmd->sock->ops->sendmsg(cmd->sock, &response, sizeof(response), 0);
- if (ret < 0) {
- ERR("Relay sending viewer attach response");
- goto end_unlock;
- }
- health_code_update();
-
- /*
- * Unknown or busy session, just return gracefully, the viewer knows what
- * is happening.
- */
- if (!send_streams) {
- ret = 0;
- goto end_unlock;
- }
-
- /* We should only be there if we have a session to attach to. */
- assert(session);
- cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, node, node) {
- health_code_update();
-
- node64 = lttng_ht_iter_get_node_u64(&iter);
- if (!node64) {
- continue;
- }
- viewer_stream = caa_container_of(node64, struct relay_viewer_stream,
- stream_n);
- if (viewer_stream->session_id != cmd->session->id) {
- continue;
- }
-
- send_stream.id = htobe64(viewer_stream->stream_handle);
- send_stream.ctf_trace_id = htobe64(viewer_stream->ctf_trace->id);
- send_stream.metadata_flag = htobe32(viewer_stream->metadata_flag);
- strncpy(send_stream.path_name, viewer_stream->path_name,
- sizeof(send_stream.path_name));
- strncpy(send_stream.channel_name, viewer_stream->channel_name,
- sizeof(send_stream.channel_name));
-
- ret = cmd->sock->ops->sendmsg(cmd->sock, &send_stream,
- sizeof(send_stream), 0);
- if (ret < 0) {
- ERR("Relay sending stream %" PRIu64, viewer_stream->stream_handle);
- goto end_unlock;
- }
- DBG("Sent stream %" PRIu64 " to viewer", viewer_stream->stream_handle);
- }
- ret = 0;
-
-end_unlock:
- rcu_read_unlock();
-end_no_session:
-error:
- return ret;
-}
-
-/*
- * Get viewer stream from stream id.
- *
- * RCU read side lock MUST be acquired.
- */
-struct relay_viewer_stream *live_find_viewer_stream_by_id(uint64_t stream_id)
-{
- struct lttng_ht_node_u64 *node;
- struct lttng_ht_iter iter;
- struct relay_viewer_stream *stream = NULL;
-
- lttng_ht_lookup(viewer_streams_ht, &stream_id, &iter);
- node = lttng_ht_iter_get_node_u64(&iter);
- if (node == NULL) {
- DBG("Relay viewer stream %" PRIu64 " not found", stream_id);
- goto end;
- }
- stream = caa_container_of(node, struct relay_viewer_stream, stream_n);
-
-end:
- return stream;
-}
-
-/*
- * Send the next index for a stream.
- *
- * Return 0 on success or else a negative value.
- */
-static
-int viewer_get_next_index(struct relay_command *cmd,
- struct lttng_ht *sessions_ht)
-{
- int ret;
- struct lttng_viewer_get_next_index request_index;
- struct lttng_viewer_index viewer_index;
- struct lttng_packet_index packet_index;
- struct relay_viewer_stream *vstream;
- struct relay_stream *rstream;
-
- assert(cmd);
- assert(sessions_ht);
-
- DBG("Viewer get next index");
-
- if (cmd->version_check_done == 0) {
- ERR("Trying to request index before version check");
- ret = -1;
- goto end_no_session;
- }
-
- health_code_update();
- ret = cmd->sock->ops->recvmsg(cmd->sock, &request_index,
- sizeof(request_index), 0);
- if (ret < 0 || ret != sizeof(request_index)) {
- ret = -1;
- ERR("Relay didn't receive the whole packet");
- goto end;
- }
- health_code_update();
-
- rcu_read_lock();
- vstream = live_find_viewer_stream_by_id(be64toh(request_index.stream_id));
- if (!vstream) {
- ret = -1;
- goto end_unlock;
- }
-
- memset(&viewer_index, 0, sizeof(viewer_index));
-
- /*
- * The viewer should not ask for index on metadata stream.
- */
- if (vstream->metadata_flag) {
- viewer_index.status = htobe32(VIEWER_INDEX_HUP);
- goto send_reply;
- }
-
- /* First time, we open the index file */
- if (vstream->index_read_fd < 0) {
- ret = open_index(vstream);
- if (ret == -ENOENT) {
- /*
- * The index is created only when the first data packet arrives, it
- * might not be ready at the beginning of the session
- */
- viewer_index.status = htobe32(VIEWER_INDEX_RETRY);
- goto send_reply;
- } else if (ret < 0) {
- viewer_index.status = htobe32(VIEWER_INDEX_ERR);
- goto send_reply;
- }
- }
-
- rstream = relay_stream_find_by_id(vstream->stream_handle);
- if (rstream) {
- if (rstream->beacon_ts_end != -1ULL &&
- vstream->last_sent_index == rstream->total_index_received) {
- viewer_index.status = htobe32(VIEWER_INDEX_INACTIVE);
- viewer_index.timestamp_end = htobe64(rstream->beacon_ts_end);
- goto send_reply;
- }
-
- if (rstream->total_index_received <= vstream->last_sent_index) {
- /* No new index to send, retry later. */
- viewer_index.status = htobe32(VIEWER_INDEX_RETRY);
- goto send_reply;
- }
- } else if (!rstream &&
- vstream->total_index_received == vstream->last_sent_index) {
- /* Last index sent and stream closed */
- viewer_index.status = htobe32(VIEWER_INDEX_HUP);
- goto send_reply;
- }
-
- if (!vstream->ctf_trace->metadata_received ||
- vstream->ctf_trace->metadata_received >
- vstream->ctf_trace->metadata_sent) {
- viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA;
- }
-
- ret = lttng_read(vstream->index_read_fd, &packet_index,
- sizeof(packet_index));
- if (ret < sizeof(packet_index)) {
- PERROR("Relay reading index file");
- viewer_index.status = htobe32(VIEWER_INDEX_ERR);
- } else {
- viewer_index.status = htobe32(VIEWER_INDEX_OK);
- vstream->last_sent_index++;
- }
-
- /*
- * Indexes are stored in big endian, no need to switch before sending.
- */
- viewer_index.offset = packet_index.offset;
- viewer_index.packet_size = packet_index.packet_size;
- viewer_index.content_size = packet_index.content_size;
- viewer_index.timestamp_begin = packet_index.timestamp_begin;
- viewer_index.timestamp_end = packet_index.timestamp_end;
- viewer_index.events_discarded = packet_index.events_discarded;
- viewer_index.stream_id = packet_index.stream_id;
-
-send_reply:
- viewer_index.flags = htobe32(viewer_index.flags);
- health_code_update();
- ret = cmd->sock->ops->sendmsg(cmd->sock, &viewer_index,
- sizeof(viewer_index), 0);
- if (ret < 0) {
- ERR("Relay index to viewer");
- goto end_unlock;
- }
- health_code_update();
-
- DBG("Index %" PRIu64 "for stream %" PRIu64 "sent",
- vstream->last_sent_index, vstream->stream_handle);
-
-end_unlock:
- rcu_read_unlock();
-
-end_no_session:
-end:
- return ret;
-}
-
-/*
- * Send the next index for a stream
- *
- * Return 0 on success or else a negative value.
- */
-static
-int viewer_get_packet(struct relay_command *cmd)
-{
- int ret, send_data = 0;
- char *data = NULL;
- uint32_t len = 0;
- ssize_t read_len;
- struct lttng_viewer_get_packet get_packet_info;
- struct lttng_viewer_trace_packet reply;
- struct relay_viewer_stream *stream;
-
- assert(cmd);
-
- DBG2("Relay get data packet");
-
- if (cmd->version_check_done == 0) {
- ERR("Trying to get packet before version check");
- ret = -1;
- goto end;
- }
-
- health_code_update();
- ret = cmd->sock->ops->recvmsg(cmd->sock, &get_packet_info,
- sizeof(get_packet_info), 0);
- if (ret < 0 || ret != sizeof(get_packet_info)) {
- ret = -1;
- ERR("Relay didn't receive the whole packet");
- goto end;
- }
- health_code_update();
-
- /* From this point on, the error label can be reached. */
- memset(&reply, 0, sizeof(reply));
-
- rcu_read_lock();
- stream = live_find_viewer_stream_by_id(be64toh(get_packet_info.stream_id));
- if (!stream) {
- goto error;
- }
- assert(stream->ctf_trace);
-
- /*
- * First time we read this stream, we need open the tracefile, we should
- * only arrive here if an index has already been sent to the viewer, so the
- * tracefile must exist, if it does not it is a fatal error.
- */
- if (stream->read_fd < 0) {
- char fullpath[PATH_MAX];
-
- ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name,
- stream->channel_name);
- if (ret < 0) {
- goto error;
- }
- ret = open(fullpath, O_RDONLY);
- if (ret < 0) {
- PERROR("Relay opening trace file");
- goto error;
- }
- stream->read_fd = ret;
- }
-
- if (!stream->ctf_trace->metadata_received ||
- stream->ctf_trace->metadata_received >
- stream->ctf_trace->metadata_sent) {
- reply.status = htobe32(VIEWER_GET_PACKET_ERR);
- reply.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA;
- goto send_reply;
- }
-
- len = be32toh(get_packet_info.len);
- data = zmalloc(len);
- if (!data) {
- PERROR("relay data zmalloc");
- goto error;
- }
-
- ret = lseek(stream->read_fd, be64toh(get_packet_info.offset), SEEK_SET);
- if (ret < 0) {
- PERROR("lseek");
- goto error;
- }
- read_len = lttng_read(stream->read_fd, data, len);
- if (read_len < len) {
- PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64,
- stream->read_fd, be64toh(get_packet_info.offset));
- goto error;
- }
- reply.status = htobe32(VIEWER_GET_PACKET_OK);
- reply.len = htobe32(len);
- send_data = 1;
- goto send_reply;
-
-error:
- reply.status = htobe32(VIEWER_GET_PACKET_ERR);
-
-send_reply:
- reply.flags = htobe32(reply.flags);
-
- health_code_update();
- ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0);
- if (ret < 0) {
- ERR("Relay data header to viewer");
- goto end_unlock;
- }
- health_code_update();
-
- if (send_data) {
- health_code_update();
- ret = cmd->sock->ops->sendmsg(cmd->sock, data, len, 0);
- if (ret < 0) {
- ERR("Relay send data to viewer");
- goto end_unlock;
- }
- health_code_update();
- }
-
- DBG("Sent %u bytes for stream %" PRIu64, len,
- be64toh(get_packet_info.stream_id));
-
-end_unlock:
- free(data);
- rcu_read_unlock();
-
-end:
- return ret;
-}
-
-/*
- * Send the session's metadata
- *
- * Return 0 on success else a negative value.
- */
-static
-int viewer_get_metadata(struct relay_command *cmd)
-{
- int ret = 0;
- ssize_t read_len;
- uint64_t len = 0;
- char *data = NULL;
- struct lttng_viewer_get_metadata request;
- struct lttng_viewer_metadata_packet reply;
- struct relay_viewer_stream *stream;
-
- assert(cmd);
-
- DBG("Relay get metadata");
-
- if (cmd->version_check_done == 0) {
- ERR("Trying to get metadata before version check");
- ret = -1;
- goto end;
- }
-
- health_code_update();
- ret = cmd->sock->ops->recvmsg(cmd->sock, &request,
- sizeof(request), 0);
- if (ret < 0 || ret != sizeof(request)) {
- ret = -1;
- ERR("Relay didn't receive the whole packet");
- goto end;
- }
- health_code_update();
-
- rcu_read_lock();
- stream = live_find_viewer_stream_by_id(be64toh(request.stream_id));
- if (!stream || !stream->metadata_flag) {
- ERR("Invalid metadata stream");
- goto error;
- }
- assert(stream->ctf_trace);
- assert(stream->ctf_trace->metadata_sent <=
- stream->ctf_trace->metadata_received);
-
- len = stream->ctf_trace->metadata_received -
- stream->ctf_trace->metadata_sent;
- if (len == 0) {
- reply.status = htobe32(VIEWER_NO_NEW_METADATA);
- goto send_reply;
- }
-
- /* first time, we open the metadata file */
- if (stream->read_fd < 0) {
- char fullpath[PATH_MAX];
-
- ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name,
- stream->channel_name);
- if (ret < 0) {
- goto error;
- }
- ret = open(fullpath, O_RDONLY);
- if (ret < 0) {
- PERROR("Relay opening metadata file");
- goto error;
- }
- stream->read_fd = ret;
- }
-
- reply.len = htobe64(len);
- data = zmalloc(len);
- if (!data) {
- PERROR("viewer metadata zmalloc");
- goto error;
- }
-
- read_len = lttng_read(stream->read_fd, data, len);
- if (read_len < len) {
- PERROR("Relay reading metadata file");
- goto error;
- }
- stream->ctf_trace->metadata_sent += read_len;
- reply.status = htobe32(VIEWER_METADATA_OK);
- goto send_reply;
-
-error:
- reply.status = htobe32(VIEWER_METADATA_ERR);
-
-send_reply:
- health_code_update();
- ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0);
- if (ret < 0) {
- ERR("Relay data header to viewer");
- goto end_unlock;
- }
- health_code_update();
-
- if (len > 0) {
- ret = cmd->sock->ops->sendmsg(cmd->sock, data, len, 0);
- if (ret < 0) {
- ERR("Relay send data to viewer");
- goto end_unlock;
- }
- }
-
- DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len,
- be64toh(request.stream_id));
-
- DBG("Metadata sent");
-
-end_unlock:
- free(data);
- rcu_read_unlock();
-end:
- return ret;
-}
-
-/*
- * live_relay_unknown_command: send -1 if received unknown command
- */
-static
-void live_relay_unknown_command(struct relay_command *cmd)
-{
- struct lttcomm_relayd_generic_reply reply;
- int ret;
-
- reply.ret_code = htobe32(LTTNG_ERR_UNK);
- ret = cmd->sock->ops->sendmsg(cmd->sock, &reply,
- sizeof(struct lttcomm_relayd_generic_reply), 0);
- if (ret < 0) {
- ERR("Relay sending unknown command");
- }
-}
-
-/*
- * Process the commands received on the control socket
- */
-static
-int process_control(struct lttng_viewer_cmd *recv_hdr,
- struct relay_command *cmd, struct lttng_ht *sessions_ht)
-{
- int ret = 0;
-
- switch (be32toh(recv_hdr->cmd)) {
- case VIEWER_CONNECT:
- ret = viewer_connect(cmd);
- break;
- case VIEWER_LIST_SESSIONS:
- ret = viewer_list_sessions(cmd, sessions_ht);
- break;
- case VIEWER_ATTACH_SESSION:
- ret = viewer_attach_session(cmd, sessions_ht);
- break;
- case VIEWER_GET_NEXT_INDEX:
- ret = viewer_get_next_index(cmd, sessions_ht);
- break;
- case VIEWER_GET_PACKET:
- ret = viewer_get_packet(cmd);
- break;
- case VIEWER_GET_METADATA:
- ret = viewer_get_metadata(cmd);
- break;
- default:
- ERR("Received unknown viewer command (%u)", be32toh(recv_hdr->cmd));
- live_relay_unknown_command(cmd);
- ret = -1;
- goto end;
- }
-
-end:
- return ret;
-}
-
-static
-void cleanup_poll_connection(struct lttng_poll_event *events, int pollfd)
-{
- int ret;
-
- assert(events);
-
- lttng_poll_del(events, pollfd);
-
- ret = close(pollfd);
- if (ret < 0) {
- ERR("Closing pollfd %d", pollfd);
- }
-}
-
-/*
- * Create and add connection to the given hash table.
- *
- * Return poll add value or else -1 on error.
- */
-static
-int add_connection(int fd, struct lttng_poll_event *events,
- struct lttng_ht *relay_connections_ht)
-{
- int ret;
- struct relay_command *relay_connection;
-
- assert(events);
- assert(relay_connections_ht);
-
- relay_connection = zmalloc(sizeof(struct relay_command));
- if (relay_connection == NULL) {
- PERROR("Relay command zmalloc");
- goto error;
- }
-
- ret = lttng_read(fd, relay_connection, sizeof(*relay_connection));
- if (ret < sizeof(*relay_connection)) {
- PERROR("read relay cmd pipe");
- goto error_read;
- }
-
- lttng_ht_node_init_ulong(&relay_connection->sock_n,
- (unsigned long) relay_connection->sock->fd);
- rcu_read_lock();
- lttng_ht_add_unique_ulong(relay_connections_ht,
- &relay_connection->sock_n);
- rcu_read_unlock();
-
- return lttng_poll_add(events, relay_connection->sock->fd,
- LPOLLIN | LPOLLRDHUP);
-
-error_read:
- free(relay_connection);
-error:
- return -1;
-}
-
-static
-void deferred_free_connection(struct rcu_head *head)
-{
- struct relay_command *relay_connection =
- caa_container_of(head, struct relay_command, rcu_node);
-
- if (relay_connection->session &&
- relay_connection->session->viewer_attached > 0) {
- relay_connection->session->viewer_attached--;
- }
- lttcomm_destroy_sock(relay_connection->sock);
- free(relay_connection);
-}
-
-static
-void deferred_free_viewer_stream(struct rcu_head *head)
-{
- struct relay_viewer_stream *stream =
- caa_container_of(head, struct relay_viewer_stream, rcu_node);
-
- if (stream->ctf_trace) {
- uatomic_dec(&stream->ctf_trace->refcount);
- assert(uatomic_read(&stream->ctf_trace->refcount) >= 0);
- if (uatomic_read(&stream->ctf_trace->refcount) == 0) {
- DBG("Freeing ctf_trace %" PRIu64, stream->ctf_trace->id);
- free(stream->ctf_trace);
- }
- }
-
- free(stream->path_name);
- free(stream->channel_name);
- free(stream);
-}
-
-static
-void viewer_del_streams(uint64_t session_id)
-{
- int ret;
- struct relay_viewer_stream *stream;
- struct lttng_ht_node_u64 *node;
- struct lttng_ht_iter iter;
-
- rcu_read_lock();
- cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, node, node) {
- health_code_update();
-
- node = lttng_ht_iter_get_node_u64(&iter);
- if (!node) {
- continue;
- }
-
- stream = caa_container_of(node, struct relay_viewer_stream, stream_n);
- if (stream->session_id != session_id) {
- continue;
- }
-
- if (stream->read_fd > 0) {
- ret = close(stream->read_fd);
- if (ret < 0) {
- PERROR("close read_fd");
- }
- }
- if (stream->index_read_fd > 0) {
- ret = close(stream->index_read_fd);
- if (ret < 0) {
- PERROR("close index_read_fd");
- }
- }
- if (stream->metadata_flag && stream->ctf_trace) {
- stream->ctf_trace->metadata_sent = 0;
- }
- ret = lttng_ht_del(viewer_streams_ht, &iter);
- assert(!ret);
- call_rcu(&stream->rcu_node, deferred_free_viewer_stream);
- }
- rcu_read_unlock();
-}
-
-/*
- * Delete and free a connection.
- *
- * RCU read side lock MUST be acquired.
- */
-static
-void del_connection(struct lttng_ht *relay_connections_ht,
- struct lttng_ht_iter *iter, struct relay_command *relay_connection)
-{
- int ret;
-
- assert(relay_connections_ht);
- assert(iter);
- assert(relay_connection);
-
- ret = lttng_ht_del(relay_connections_ht, iter);
- assert(!ret);
-
- viewer_del_streams(relay_connection->session_id);
-
- call_rcu(&relay_connection->rcu_node, deferred_free_connection);
-}
-
-/*
- * This thread does the actual work
- */
-static
-void *thread_worker(void *data)
-{
- int ret, err = -1;
- uint32_t nb_fd;
- struct relay_command *relay_connection;
- struct lttng_poll_event events;
- struct lttng_ht *relay_connections_ht;
- struct lttng_ht_node_ulong *node;
- struct lttng_ht_iter iter;
- struct lttng_viewer_cmd recv_hdr;
- struct relay_local_data *relay_ctx = (struct relay_local_data *) data;
- struct lttng_ht *sessions_ht = relay_ctx->sessions_ht;
-
- DBG("[thread] Live viewer relay worker started");
-
- rcu_register_thread();
-
- health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER);
-
- /* table of connections indexed on socket */
- relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
- if (!relay_connections_ht) {
- goto relay_connections_ht_error;
- }
-
- ret = create_thread_poll_set(&events, 2);
- if (ret < 0) {
- goto error_poll_create;
- }
-
- ret = lttng_poll_add(&events, live_relay_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
- if (ret < 0) {
- goto error;
- }
-
-restart:
- while (1) {
- int i;
-
- health_code_update();
-
- /* Infinite blocking call, waiting for transmission */
- DBG3("Relayd live viewer worker thread polling...");
- 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;
-
- /*
- * Process control. The control connection is prioritised so we don't
- * starve it with high throughput tracing data on the data
- * connection.
- */
- for (i = 0; i < nb_fd; i++) {
- /* Fetch once the poll data */
- uint32_t revents = LTTNG_POLL_GETEV(&events, i);
- int pollfd = LTTNG_POLL_GETFD(&events, i);
-
- health_code_update();
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = check_thread_quit_pipe(pollfd, revents);
- if (ret) {
- err = 0;
- goto exit;
- }
-
- /* Inspect the relay cmd pipe for new connection */
- if (pollfd == live_relay_cmd_pipe[0]) {
- if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("Relay live pipe error");
- goto error;
- } else if (revents & LPOLLIN) {
- DBG("Relay live viewer command received");
- ret = add_connection(live_relay_cmd_pipe[0],
- &events, relay_connections_ht);
- if (ret < 0) {
- goto error;
- }
- }
- } else if (revents) {
- rcu_read_lock();
- lttng_ht_lookup(relay_connections_ht,
- (void *)((unsigned long) pollfd), &iter);
- node = lttng_ht_iter_get_node_ulong(&iter);
- if (node == NULL) {
- DBG2("Relay viewer sock %d not found", pollfd);
- rcu_read_unlock();
- goto error;
- }
- relay_connection = caa_container_of(node, struct relay_command,
- sock_n);
-
- if (revents & (LPOLLERR)) {
- cleanup_poll_connection(&events, pollfd);
- del_connection(relay_connections_ht, &iter,
- relay_connection);
- } else if (revents & (LPOLLHUP | LPOLLRDHUP)) {
- DBG("Viewer socket %d hung up", pollfd);
- cleanup_poll_connection(&events, pollfd);
- del_connection(relay_connections_ht, &iter,
- relay_connection);
- } else if (revents & LPOLLIN) {
- ret = relay_connection->sock->ops->recvmsg(
- relay_connection->sock, &recv_hdr,
- sizeof(struct lttng_viewer_cmd),
- 0);
- /* connection closed */
- if (ret <= 0) {
- cleanup_poll_connection(&events, pollfd);
- del_connection(relay_connections_ht, &iter,
- relay_connection);
- DBG("Viewer control connection closed with %d",
- pollfd);
- } else {
- if (relay_connection->session) {
- DBG2("Relay viewer worker receiving data for "
- "session: %" PRIu64,
- relay_connection->session->id);
- }
- ret = process_control(&recv_hdr, relay_connection,
- sessions_ht);
- if (ret < 0) {
- /* Clear the session on error. */
- cleanup_poll_connection(&events, pollfd);
- del_connection(relay_connections_ht, &iter,
- relay_connection);
- DBG("Viewer connection closed with %d", pollfd);
- }
- }
- }
- rcu_read_unlock();
- }
- }
- }
-
-exit:
-error:
- lttng_poll_clean(&events);
-
- /* empty the hash table and free the memory */
- rcu_read_lock();
- cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, node, node) {
- health_code_update();
-
- node = lttng_ht_iter_get_node_ulong(&iter);
- if (!node) {
- continue;
- }
-
- relay_connection = caa_container_of(node, struct relay_command,
- sock_n);
- del_connection(relay_connections_ht, &iter, relay_connection);
- }
- rcu_read_unlock();
-error_poll_create:
- lttng_ht_destroy(relay_connections_ht);
-relay_connections_ht_error:
- /* Close relay cmd pipes */
- utils_close_pipe(live_relay_cmd_pipe);
- if (err) {
- DBG("Viewer worker thread exited with error");
- }
- DBG("Viewer worker thread cleanup complete");
- if (err) {
- health_error();
- ERR("Health error occurred in %s", __func__);
- }
- health_unregister(health_relayd);
- stop_threads();
- rcu_unregister_thread();
- return NULL;
-}
-
-/*
- * Create the relay command pipe to wake thread_manage_apps.
- * Closed in cleanup().
- */
-static int create_relay_cmd_pipe(void)
-{
- int ret;
-
- ret = utils_create_pipe_cloexec(live_relay_cmd_pipe);
-
- return ret;
-}
-
-void live_stop_threads(void)
-{
- int ret;
- void *status;
-
- stop_threads();
-
- ret = pthread_join(live_listener_thread, &status);
- if (ret != 0) {
- PERROR("pthread_join live listener");
- goto error; /* join error, exit without cleanup */
- }
-
- ret = pthread_join(live_worker_thread, &status);
- if (ret != 0) {
- PERROR("pthread_join live worker");
- goto error; /* join error, exit without cleanup */
- }
-
- ret = pthread_join(live_dispatcher_thread, &status);
- if (ret != 0) {
- PERROR("pthread_join live dispatcher");
- goto error; /* join error, exit without cleanup */
- }
-
- cleanup();
-
-error:
- return;
-}
-
-/*
- * main
- */
-int live_start_threads(struct lttng_uri *uri,
- struct relay_local_data *relay_ctx, int quit_pipe[2])
-{
- int ret = 0;
- void *status;
- int is_root;
-
- assert(uri);
- live_uri = uri;
-
- live_thread_quit_pipe[0] = quit_pipe[0];
- live_thread_quit_pipe[1] = quit_pipe[1];
-
- /* Check if daemon is UID = 0 */
- is_root = !getuid();
-
- if (!is_root) {
- if (live_uri->port < 1024) {
- ERR("Need to be root to use ports < 1024");
- ret = -1;
- goto exit;
- }
- }
-
- /* Setup the thread apps communication pipe. */
- if ((ret = create_relay_cmd_pipe()) < 0) {
- goto exit;
- }
-
- /* Init relay command queue. */
- cds_wfq_init(&viewer_cmd_queue.queue);
-
- /* Set up max poll set size */
- lttng_poll_set_max_size();
-
- /* Setup the dispatcher thread */
- ret = pthread_create(&live_dispatcher_thread, NULL,
- thread_dispatcher, (void *) NULL);
- if (ret != 0) {
- PERROR("pthread_create viewer dispatcher");
- goto exit_dispatcher;
- }
-
- /* Setup the worker thread */
- ret = pthread_create(&live_worker_thread, NULL,
- thread_worker, relay_ctx);
- if (ret != 0) {
- PERROR("pthread_create viewer worker");
- goto exit_worker;
- }
-
- /* Setup the listener thread */
- ret = pthread_create(&live_listener_thread, NULL,
- thread_listener, (void *) NULL);
- if (ret != 0) {
- PERROR("pthread_create viewer listener");
- goto exit_listener;
- }
-
- ret = 0;
- goto end;
-
-exit_listener:
- ret = pthread_join(live_listener_thread, &status);
- if (ret != 0) {
- PERROR("pthread_join live listener");
- goto error; /* join error, exit without cleanup */
- }
-
-exit_worker:
- ret = pthread_join(live_worker_thread, &status);
- if (ret != 0) {
- PERROR("pthread_join live worker");
- goto error; /* join error, exit without cleanup */
- }
-
-exit_dispatcher:
- ret = pthread_join(live_dispatcher_thread, &status);
- if (ret != 0) {
- PERROR("pthread_join live dispatcher");
- goto error; /* join error, exit without cleanup */
- }
-
-exit:
- cleanup();
-
-end:
-error:
- return ret;
-}
projects / lttng-tools.git / blobdiff