--- /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)
+{
+ int ret;
+
+ do {
+ ret = write(wpipe, "!", 1);
+ } while (ret < 0 && errno == EINTR);
+ if (ret < 0 || ret != 1) {
+ PERROR("write poll pipe");
+ }
+
+ return 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 ret, err = -1;
+ 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 :)
+ */
+ do {
+ ret = write(live_relay_cmd_pipe[1], relay_cmd,
+ sizeof(*relay_cmd));
+ } while (ret < 0 && errno == EINTR);
+ free(relay_cmd);
+ if (ret < 0 || 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);
+
+ 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;
+}
+
+/*
+ * 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 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;
+
+ /*
+ * 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;
+
+ 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:
+ /* TODO */
+ 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);
+ 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;
+}
+
+/*
+ * 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;
+ } else {
+ 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);
+
+ do {
+ health_code_update();
+ ret = read(stream->index_read_fd, &hdr, sizeof(hdr));
+ } while (ret < 0 && errno == EINTR);
+ if (ret < 0) {
+ 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;
+}
+
+/*
+ * 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;
+ }
+
+ do {
+ health_code_update();
+ ret = read(vstream->index_read_fd, &packet_index,
+ sizeof(packet_index));
+ } while (ret < 0 && errno == EINTR);
+ 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();
+
+ 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;
+ }
+
+ memset(&reply, 0, sizeof(reply));
+
+ 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 = read(stream->read_fd, data, len);
+ if (read_len < (ssize_t) 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 = read(stream->read_fd, data, len);
+ if (read_len < (ssize_t) 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;
+ }
+
+ do {
+ health_code_update();
+ ret = read(fd, relay_connection, sizeof(*relay_connection));
+ } while (ret < 0 && errno == EINTR);
+ if (ret < 0 || 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()
+{
+ 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