--- /dev/null
+/*
+ * Copyright (C) 2012 - 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 <assert.h>
+#include <urcu/list.h>
+#include <urcu/uatomic.h>
+
+#include <common/defaults.h>
+#include <common/common.h>
+#include <common/sessiond-comm/sessiond-comm.h>
+#include <common/relayd/relayd.h>
+
+#include "channel.h"
+#include "consumer.h"
+#include "event.h"
+#include "kernel.h"
+#include "kernel-consumer.h"
+#include "lttng-sessiond.h"
+#include "utils.h"
+
+#include "cmd.h"
+
+/*
+ * Used to keep a unique index for each relayd socket created where this value
+ * is associated with streams on the consumer so it can match the right relayd
+ * to send to.
+ *
+ * This value should be incremented atomically for safety purposes and future
+ * possible concurrent access.
+ */
+static unsigned int relayd_net_seq_idx;
+
+/*
+ * Create a session path used by list_lttng_sessions for the case that the
+ * session consumer is on the network.
+ */
+static int build_network_session_path(char *dst, size_t size,
+ struct ltt_session *session)
+{
+ int ret, kdata_port, udata_port;
+ struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
+ char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
+
+ assert(session);
+ assert(dst);
+
+ memset(tmp_urls, 0, sizeof(tmp_urls));
+ memset(tmp_uurl, 0, sizeof(tmp_uurl));
+
+ kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
+
+ if (session->kernel_session && session->kernel_session->consumer) {
+ kuri = &session->kernel_session->consumer->dst.net.control;
+ kdata_port = session->kernel_session->consumer->dst.net.data.port;
+ }
+
+ if (session->ust_session && session->ust_session->consumer) {
+ uuri = &session->ust_session->consumer->dst.net.control;
+ udata_port = session->ust_session->consumer->dst.net.data.port;
+ }
+
+ if (uuri == NULL && kuri == NULL) {
+ uri = &session->consumer->dst.net.control;
+ kdata_port = session->consumer->dst.net.data.port;
+ } else if (kuri && uuri) {
+ ret = uri_compare(kuri, uuri);
+ if (ret) {
+ /* Not Equal */
+ uri = kuri;
+ /* Build uuri URL string */
+ ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
+ if (ret < 0) {
+ goto error;
+ }
+ } else {
+ uri = kuri;
+ }
+ } else if (kuri && uuri == NULL) {
+ uri = kuri;
+ } else if (uuri && kuri == NULL) {
+ uri = uuri;
+ }
+
+ ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
+ if (ret < 0) {
+ goto error;
+ }
+
+ if (strlen(tmp_uurl) > 0) {
+ ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
+ tmp_urls, kdata_port, tmp_uurl, udata_port);
+ } else {
+ ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, kdata_port);
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * Fill lttng_channel array of all channels.
+ */
+static void list_lttng_channels(int domain, struct ltt_session *session,
+ struct lttng_channel *channels)
+{
+ int i = 0;
+ struct ltt_kernel_channel *kchan;
+
+ DBG("Listing channels for session %s", session->name);
+
+ switch (domain) {
+ case LTTNG_DOMAIN_KERNEL:
+ /* Kernel channels */
+ if (session->kernel_session != NULL) {
+ cds_list_for_each_entry(kchan,
+ &session->kernel_session->channel_list.head, list) {
+ /* Copy lttng_channel struct to array */
+ memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
+ channels[i].enabled = kchan->enabled;
+ i++;
+ }
+ }
+ break;
+ case LTTNG_DOMAIN_UST:
+ {
+ struct lttng_ht_iter iter;
+ struct ltt_ust_channel *uchan;
+
+ cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
+ &iter.iter, uchan, node.node) {
+ strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
+ channels[i].attr.overwrite = uchan->attr.overwrite;
+ channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
+ channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
+ channels[i].attr.switch_timer_interval =
+ uchan->attr.switch_timer_interval;
+ channels[i].attr.read_timer_interval =
+ uchan->attr.read_timer_interval;
+ channels[i].enabled = uchan->enabled;
+ switch (uchan->attr.output) {
+ case LTTNG_UST_MMAP:
+ default:
+ channels[i].attr.output = LTTNG_EVENT_MMAP;
+ break;
+ }
+ i++;
+ }
+ break;
+ }
+ default:
+ break;
+ }
+}
+
+/*
+ * Create a list of ust global domain events.
+ */
+static int list_lttng_ust_global_events(char *channel_name,
+ struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
+{
+ int i = 0, ret = 0;
+ unsigned int nb_event = 0;
+ struct lttng_ht_iter iter;
+ struct lttng_ht_node_str *node;
+ struct ltt_ust_channel *uchan;
+ struct ltt_ust_event *uevent;
+ struct lttng_event *tmp;
+
+ DBG("Listing UST global events for channel %s", channel_name);
+
+ rcu_read_lock();
+
+ lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
+ node = lttng_ht_iter_get_node_str(&iter);
+ if (node == NULL) {
+ ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
+
+ nb_event += lttng_ht_get_count(uchan->events);
+
+ if (nb_event == 0) {
+ ret = nb_event;
+ goto error;
+ }
+
+ DBG3("Listing UST global %d events", nb_event);
+
+ tmp = zmalloc(nb_event * sizeof(struct lttng_event));
+ if (tmp == NULL) {
+ ret = -LTTCOMM_FATAL;
+ goto error;
+ }
+
+ cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
+ strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
+ tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
+ tmp[i].enabled = uevent->enabled;
+
+ switch (uevent->attr.instrumentation) {
+ case LTTNG_UST_TRACEPOINT:
+ tmp[i].type = LTTNG_EVENT_TRACEPOINT;
+ break;
+ case LTTNG_UST_PROBE:
+ tmp[i].type = LTTNG_EVENT_PROBE;
+ break;
+ case LTTNG_UST_FUNCTION:
+ tmp[i].type = LTTNG_EVENT_FUNCTION;
+ break;
+ }
+
+ tmp[i].loglevel = uevent->attr.loglevel;
+ switch (uevent->attr.loglevel_type) {
+ case LTTNG_UST_LOGLEVEL_ALL:
+ tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
+ break;
+ case LTTNG_UST_LOGLEVEL_RANGE:
+ tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
+ break;
+ case LTTNG_UST_LOGLEVEL_SINGLE:
+ tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
+ break;
+ }
+ if (uevent->filter) {
+ tmp[i].filter = 1;
+ }
+ i++;
+ }
+
+ ret = nb_event;
+ *events = tmp;
+
+error:
+ rcu_read_unlock();
+ return ret;
+}
+
+/*
+ * Fill lttng_event array of all kernel events in the channel.
+ */
+static int list_lttng_kernel_events(char *channel_name,
+ struct ltt_kernel_session *kernel_session, struct lttng_event **events)
+{
+ int i = 0, ret;
+ unsigned int nb_event;
+ struct ltt_kernel_event *event;
+ struct ltt_kernel_channel *kchan;
+
+ kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
+ if (kchan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ nb_event = kchan->event_count;
+
+ DBG("Listing events for channel %s", kchan->channel->name);
+
+ if (nb_event == 0) {
+ ret = nb_event;
+ goto error;
+ }
+
+ *events = zmalloc(nb_event * sizeof(struct lttng_event));
+ if (*events == NULL) {
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+
+ /* Kernel channels */
+ cds_list_for_each_entry(event, &kchan->events_list.head , list) {
+ strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
+ (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
+ (*events)[i].enabled = event->enabled;
+
+ switch (event->event->instrumentation) {
+ case LTTNG_KERNEL_TRACEPOINT:
+ (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
+ break;
+ case LTTNG_KERNEL_KPROBE:
+ case LTTNG_KERNEL_KRETPROBE:
+ (*events)[i].type = LTTNG_EVENT_PROBE;
+ memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
+ sizeof(struct lttng_kernel_kprobe));
+ break;
+ case LTTNG_KERNEL_FUNCTION:
+ (*events)[i].type = LTTNG_EVENT_FUNCTION;
+ memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
+ sizeof(struct lttng_kernel_function));
+ break;
+ case LTTNG_KERNEL_NOOP:
+ (*events)[i].type = LTTNG_EVENT_NOOP;
+ break;
+ case LTTNG_KERNEL_SYSCALL:
+ (*events)[i].type = LTTNG_EVENT_SYSCALL;
+ break;
+ case LTTNG_KERNEL_ALL:
+ assert(0);
+ break;
+ }
+ i++;
+ }
+
+ return nb_event;
+
+error:
+ return ret;
+}
+
+/*
+ * Add URI so the consumer output object. Set the correct path depending on the
+ * domain adding the default trace directory.
+ */
+static int add_uri_to_consumer(struct consumer_output *consumer,
+ struct lttng_uri *uri, int domain, const char *session_name)
+{
+ int ret = LTTCOMM_OK;
+ const char *default_trace_dir;
+
+ assert(uri);
+
+ if (consumer == NULL) {
+ DBG("No consumer detected. Don't add URI. Stopping.");
+ ret = LTTCOMM_NO_CONSUMER;
+ goto error;
+ }
+
+ switch (domain) {
+ case LTTNG_DOMAIN_KERNEL:
+ default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
+ break;
+ case LTTNG_DOMAIN_UST:
+ default_trace_dir = DEFAULT_UST_TRACE_DIR;
+ break;
+ default:
+ /*
+ * This case is possible is we try to add the URI to the global tracing
+ * session consumer object which in this case there is no subdir.
+ */
+ default_trace_dir = "";
+ }
+
+ switch (uri->dtype) {
+ case LTTNG_DST_IPV4:
+ case LTTNG_DST_IPV6:
+ DBG2("Setting network URI to consumer");
+
+ /* Set URI into consumer output object */
+ ret = consumer_set_network_uri(consumer, uri);
+ if (ret < 0) {
+ ret = LTTCOMM_FATAL;
+ goto error;
+ } else if (ret == 1) {
+ /*
+ * URI was the same in the consumer so we do not append the subdir
+ * again so to not duplicate output dir.
+ */
+ goto error;
+ }
+
+ if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
+ ret = consumer_set_subdir(consumer, session_name);
+ if (ret < 0) {
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+ }
+
+ if (uri->stype == LTTNG_STREAM_CONTROL) {
+ /* On a new subdir, reappend the default trace dir. */
+ strncat(consumer->subdir, default_trace_dir, sizeof(consumer->subdir));
+ DBG3("Append domain trace name to subdir %s", consumer->subdir);
+ }
+
+ break;
+ case LTTNG_DST_PATH:
+ DBG2("Setting trace directory path from URI to %s", uri->dst.path);
+ memset(consumer->dst.trace_path, 0,
+ sizeof(consumer->dst.trace_path));
+ strncpy(consumer->dst.trace_path, uri->dst.path,
+ sizeof(consumer->dst.trace_path));
+ /* Append default trace dir */
+ strncat(consumer->dst.trace_path, default_trace_dir,
+ sizeof(consumer->dst.trace_path));
+ /* Flag consumer as local. */
+ consumer->type = CONSUMER_DST_LOCAL;
+ break;
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * Init tracing by creating trace directory and sending fds kernel consumer.
+ */
+static int init_kernel_tracing(struct ltt_kernel_session *session)
+{
+ int ret = 0;
+ struct lttng_ht_iter iter;
+ struct consumer_socket *socket;
+
+ assert(session);
+
+ if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
+ cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
+ socket, node.node) {
+ /* Code flow error */
+ assert(socket->fd >= 0);
+
+ pthread_mutex_lock(socket->lock);
+ ret = kernel_consumer_send_session(socket->fd, session);
+ pthread_mutex_unlock(socket->lock);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_CONSUMER_FAIL;
+ goto error;
+ }
+ }
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * Create a socket to the relayd using the URI.
+ *
+ * On success, the relayd_sock pointer is set to the created socket.
+ * Else, it's stays untouched and a lttcomm error code is returned.
+ */
+static int create_connect_relayd(struct consumer_output *output,
+ const char *session_name, struct lttng_uri *uri,
+ struct lttcomm_sock **relayd_sock)
+{
+ int ret;
+ struct lttcomm_sock *sock;
+
+ /* Create socket object from URI */
+ sock = lttcomm_alloc_sock_from_uri(uri);
+ if (sock == NULL) {
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+
+ ret = lttcomm_create_sock(sock);
+ if (ret < 0) {
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+
+ /* Connect to relayd so we can proceed with a session creation. */
+ ret = relayd_connect(sock);
+ if (ret < 0) {
+ ERR("Unable to reach lttng-relayd");
+ ret = LTTCOMM_RELAYD_SESSION_FAIL;
+ goto free_sock;
+ }
+
+ /* Create socket for control stream. */
+ if (uri->stype == LTTNG_STREAM_CONTROL) {
+ DBG3("Creating relayd stream socket from URI");
+
+ /* Check relayd version */
+ ret = relayd_version_check(sock, RELAYD_VERSION_COMM_MAJOR,
+ RELAYD_VERSION_COMM_MINOR);
+ if (ret < 0) {
+ ret = LTTCOMM_RELAYD_VERSION_FAIL;
+ goto close_sock;
+ }
+ } else if (uri->stype == LTTNG_STREAM_DATA) {
+ DBG3("Creating relayd data socket from URI");
+ } else {
+ /* Command is not valid */
+ ERR("Relayd invalid stream type: %d", uri->stype);
+ ret = LTTCOMM_INVALID;
+ goto close_sock;
+ }
+
+ *relayd_sock = sock;
+
+ return LTTCOMM_OK;
+
+close_sock:
+ if (sock) {
+ (void) relayd_close(sock);
+ }
+free_sock:
+ if (sock) {
+ lttcomm_destroy_sock(sock);
+ }
+error:
+ return ret;
+}
+
+/*
+ * Connect to the relayd using URI and send the socket to the right consumer.
+ */
+static int send_consumer_relayd_socket(int domain, struct ltt_session *session,
+ struct lttng_uri *relayd_uri, struct consumer_output *consumer,
+ int consumer_fd)
+{
+ int ret;
+ struct lttcomm_sock *sock = NULL;
+
+ /* Set the network sequence index if not set. */
+ if (consumer->net_seq_index == -1) {
+ /*
+ * Increment net_seq_idx because we are about to transfer the
+ * new relayd socket to the consumer.
+ */
+ uatomic_inc(&relayd_net_seq_idx);
+ /* Assign unique key so the consumer can match streams */
+ uatomic_set(&consumer->net_seq_index,
+ uatomic_read(&relayd_net_seq_idx));
+ }
+
+ /* Connect to relayd and make version check if uri is the control. */
+ ret = create_connect_relayd(consumer, session->name, relayd_uri, &sock);
+ if (ret != LTTCOMM_OK) {
+ goto close_sock;
+ }
+
+ /* If the control socket is connected, network session is ready */
+ if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
+ session->net_handle = 1;
+ }
+
+ /* Send relayd socket to consumer. */
+ ret = consumer_send_relayd_socket(consumer_fd, sock,
+ consumer, relayd_uri->stype);
+ if (ret < 0) {
+ ret = LTTCOMM_ENABLE_CONSUMER_FAIL;
+ goto close_sock;
+ }
+
+ ret = LTTCOMM_OK;
+
+ /*
+ * Close socket which was dup on the consumer side. The session daemon does
+ * NOT keep track of the relayd socket(s) once transfer to the consumer.
+ */
+
+close_sock:
+ if (sock) {
+ (void) relayd_close(sock);
+ lttcomm_destroy_sock(sock);
+ }
+
+ return ret;
+}
+
+/*
+ * Send both relayd sockets to a specific consumer and domain. This is a
+ * helper function to facilitate sending the information to the consumer for a
+ * session.
+ */
+static int send_consumer_relayd_sockets(int domain,
+ struct ltt_session *session, struct consumer_output *consumer, int fd)
+{
+ int ret;
+
+ assert(session);
+ assert(consumer);
+
+ /* Don't resend the sockets to the consumer. */
+ if (consumer->dst.net.relayd_socks_sent) {
+ ret = LTTCOMM_OK;
+ goto error;
+ }
+
+ /* Sending control relayd socket. */
+ ret = send_consumer_relayd_socket(domain, session,
+ &consumer->dst.net.control, consumer, fd);
+ if (ret != LTTCOMM_OK) {
+ goto error;
+ }
+
+ /* Sending data relayd socket. */
+ ret = send_consumer_relayd_socket(domain, session,
+ &consumer->dst.net.data, consumer, fd);
+ if (ret != LTTCOMM_OK) {
+ goto error;
+ }
+
+ /* Flag that all relayd sockets were sent to the consumer. */
+ consumer->dst.net.relayd_socks_sent = 1;
+
+error:
+ return ret;
+}
+
+/*
+ * Setup relayd connections for a tracing session. First creates the socket to
+ * the relayd and send them to the right domain consumer. Consumer type MUST be
+ * network.
+ */
+static int setup_relayd(struct ltt_session *session)
+{
+ int ret = LTTCOMM_OK;
+ struct ltt_ust_session *usess;
+ struct ltt_kernel_session *ksess;
+ struct consumer_socket *socket;
+ struct lttng_ht_iter iter;
+
+ assert(session);
+
+ usess = session->ust_session;
+ ksess = session->kernel_session;
+
+ DBG2("Setting relayd for session %s", session->name);
+
+ if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
+ && usess->consumer->enabled) {
+ /* For each consumer socket, send relayd sockets */
+ cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
+ socket, node.node) {
+ /* Code flow error */
+ assert(socket->fd >= 0);
+
+ pthread_mutex_lock(socket->lock);
+ send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session,
+ usess->consumer, socket->fd);
+ pthread_mutex_unlock(socket->lock);
+ if (ret != LTTCOMM_OK) {
+ goto error;
+ }
+ }
+ }
+
+ if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
+ && ksess->consumer->enabled) {
+ cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
+ socket, node.node) {
+ /* Code flow error */
+ assert(socket->fd >= 0);
+
+ pthread_mutex_lock(socket->lock);
+ send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session,
+ ksess->consumer, socket->fd);
+ pthread_mutex_unlock(socket->lock);
+ if (ret != LTTCOMM_OK) {
+ goto error;
+ }
+ }
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
+ */
+int cmd_disable_channel(struct ltt_session *session, int domain,
+ char *channel_name)
+{
+ int ret;
+ struct ltt_ust_session *usess;
+
+ usess = session->ust_session;
+
+ switch (domain) {
+ case LTTNG_DOMAIN_KERNEL:
+ {
+ ret = channel_kernel_disable(session->kernel_session,
+ channel_name);
+ if (ret != LTTCOMM_OK) {
+ goto error;
+ }
+
+ kernel_wait_quiescent(kernel_tracer_fd);
+ break;
+ }
+ case LTTNG_DOMAIN_UST:
+ {
+ struct ltt_ust_channel *uchan;
+ struct lttng_ht *chan_ht;
+
+ chan_ht = usess->domain_global.channels;
+
+ uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
+ if (uchan == NULL) {
+ ret = LTTCOMM_UST_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ ret = channel_ust_disable(usess, domain, uchan);
+ if (ret != LTTCOMM_OK) {
+ goto error;
+ }
+ break;
+ }
+#if 0
+ case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
+ case LTTNG_DOMAIN_UST_EXEC_NAME:
+ case LTTNG_DOMAIN_UST_PID:
+#endif
+ default:
+ ret = LTTCOMM_UNKNOWN_DOMAIN;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+
+error:
+ return ret;
+}
+
+/*
+ * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
+ *
+ * The wpipe arguments is used as a notifier for the kernel thread.
+ */
+int cmd_enable_channel(struct ltt_session *session,
+ int domain, struct lttng_channel *attr, int wpipe)
+{
+ int ret;
+ struct ltt_ust_session *usess = session->ust_session;
+ struct lttng_ht *chan_ht;
+
+ assert(session);
+ assert(attr);
+
+ DBG("Enabling channel %s for session %s", attr->name, session->name);
+
+ switch (domain) {
+ case LTTNG_DOMAIN_KERNEL:
+ {
+ struct ltt_kernel_channel *kchan;
+
+ /* Mandatory for a kernel channel. */
+ assert(wpipe > 0);
+
+ kchan = trace_kernel_get_channel_by_name(attr->name,
+ session->kernel_session);
+ if (kchan == NULL) {
+ ret = channel_kernel_create(session->kernel_session, attr, wpipe);
+ } else {
+ ret = channel_kernel_enable(session->kernel_session, kchan);
+ }
+
+ if (ret != LTTCOMM_OK) {
+ goto error;
+ }
+
+ kernel_wait_quiescent(kernel_tracer_fd);
+ break;
+ }
+ case LTTNG_DOMAIN_UST:
+ {
+ struct ltt_ust_channel *uchan;
+
+ chan_ht = usess->domain_global.channels;
+
+ uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
+ if (uchan == NULL) {
+ ret = channel_ust_create(usess, domain, attr);
+ } else {
+ ret = channel_ust_enable(usess, domain, uchan);
+ }
+ break;
+ }
+#if 0
+ case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
+ case LTTNG_DOMAIN_UST_EXEC_NAME:
+ case LTTNG_DOMAIN_UST_PID:
+#endif
+ default:
+ ret = LTTCOMM_UNKNOWN_DOMAIN;
+ goto error;
+ }
+
+error:
+ return ret;
+}
+
+
+/*
+ * Command LTTNG_DISABLE_EVENT processed by the client thread.
+ */
+int cmd_disable_event(struct ltt_session *session, int domain,
+ char *channel_name, char *event_name)
+{
+ int ret;
+
+ switch (domain) {
+ case LTTNG_DOMAIN_KERNEL:
+ {
+ struct ltt_kernel_channel *kchan;
+ struct ltt_kernel_session *ksess;
+
+ ksess = session->kernel_session;
+
+ kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
+ if (kchan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
+ if (ret != LTTCOMM_OK) {
+ goto error;
+ }
+
+ kernel_wait_quiescent(kernel_tracer_fd);
+ break;
+ }
+ case LTTNG_DOMAIN_UST:
+ {
+ struct ltt_ust_channel *uchan;
+ struct ltt_ust_session *usess;
+
+ usess = session->ust_session;
+
+ uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
+ channel_name);
+ if (uchan == NULL) {
+ ret = LTTCOMM_UST_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
+ if (ret != LTTCOMM_OK) {
+ goto error;
+ }
+
+ DBG3("Disable UST event %s in channel %s completed", event_name,
+ channel_name);
+ break;
+ }
+#if 0
+ case LTTNG_DOMAIN_UST_EXEC_NAME:
+ case LTTNG_DOMAIN_UST_PID:
+ case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
+#endif
+ default:
+ ret = LTTCOMM_UND;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+
+error:
+ return ret;
+}
+
+/*
+ * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
+ */
+int cmd_disable_event_all(struct ltt_session *session, int domain,
+ char *channel_name)
+{
+ int ret;
+
+ switch (domain) {
+ case LTTNG_DOMAIN_KERNEL:
+ {
+ struct ltt_kernel_session *ksess;
+ struct ltt_kernel_channel *kchan;
+
+ ksess = session->kernel_session;
+
+ kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
+ if (kchan == NULL) {
+ ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ ret = event_kernel_disable_all(ksess, kchan);
+ if (ret != LTTCOMM_OK) {
+ goto error;
+ }
+
+ kernel_wait_quiescent(kernel_tracer_fd);
+ break;
+ }
+ case LTTNG_DOMAIN_UST:
+ {
+ struct ltt_ust_session *usess;
+ struct ltt_ust_channel *uchan;
+
+ usess = session->ust_session;
+
+ uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
+ channel_name);
+ if (uchan == NULL) {
+ ret = LTTCOMM_UST_CHAN_NOT_FOUND;
+ goto error;
+ }
+
+ ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
+ if (ret != 0) {
+ goto error;
+ }
+
+ DBG3("Disable all UST events in channel %s completed", channel_name);
+
+ break;
+ }
+#if 0
+ case LTTNG_DOMAIN_UST_EXEC_NAME:
+ case LTTNG_DOMAIN_UST_PID:
+ case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
+#endif
+ default:
+ ret = LTTCOMM_UND;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+
+error:
+ return ret;
+}
+
+/*
+ * Command LTTNG_ADD_CONTEXT processed by the client thread.
+ */
+int cmd_add_context(struct ltt_session *session, int domain,
+ char *channel_name, char *event_name, struct lttng_event_context *ctx)
+{
+ int ret;
+
+ switch (domain) {
+ case LTTNG_DOMAIN_KERNEL:
+ /* Add kernel context to kernel tracer */
+ ret = context_kernel_add(session->kernel_session, ctx,
+ event_name, channel_name);
+ if (ret != LTTCOMM_OK) {
+ goto error;
+ }
+ break;
+ case LTTNG_DOMAIN_UST:
+ {
+ struct ltt_ust_session *usess = session->ust_session;
+
+ assert(usess);
+
+ ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
+ if (ret != LTTCOMM_OK) {
+ goto error;
+ }
+ break;
+ }
+#if 0
+ case LTTNG_DOMAIN_UST_EXEC_NAME:
+ case LTTNG_DOMAIN_UST_PID:
+ case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
+#endif
+ default:
+ ret = LTTCOMM_UND;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+
+error:
+ return ret;
+}
+
+/*
+ * Command LTTNG_SET_FILTER processed by the client thread.
+ */
+int cmd_set_filter(struct ltt_session *session, int domain,
+ char *channel_name, char *event_name,
+ struct lttng_filter_bytecode *bytecode)
+{
+ int ret;
+
+ switch (domain) {
+ case LTTNG_DOMAIN_KERNEL:
+ ret = LTTCOMM_FATAL;
+ break;
+ case LTTNG_DOMAIN_UST:
+ {
+ struct ltt_ust_session *usess = session->ust_session;
+
+ ret = filter_ust_set(usess, domain, bytecode, event_name, channel_name);
+ if (ret != LTTCOMM_OK) {
+ goto error;
+ }
+ break;
+ }
+#if 0
+ case LTTNG_DOMAIN_UST_EXEC_NAME:
+ case LTTNG_DOMAIN_UST_PID:
+ case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
+#endif
+ default:
+ ret = LTTCOMM_UND;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+
+error:
+ return ret;
+
+}
+
+
+/*
+ * Command LTTNG_ENABLE_EVENT processed by the client thread.
+ */
+int cmd_enable_event(struct ltt_session *session, int domain,
+ char *channel_name, struct lttng_event *event, int wpipe)
+{
+ int ret;
+ struct lttng_channel *attr;
+
+ assert(session);
+ assert(event);
+ assert(channel_name);
+
+ switch (domain) {
+ case LTTNG_DOMAIN_KERNEL:
+ {
+ struct ltt_kernel_channel *kchan;
+
+ kchan = trace_kernel_get_channel_by_name(channel_name,
+ session->kernel_session);
+ if (kchan == NULL) {
+ attr = channel_new_default_attr(domain);
+ if (attr == NULL) {
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+ strncpy(attr->name, channel_name, sizeof(attr->name));
+
+ ret = cmd_enable_channel(session, domain, attr, wpipe);
+ if (ret != LTTCOMM_OK) {
+ free(attr);
+ goto error;
+ }
+ free(attr);
+ }
+
+ /* Get the newly created kernel channel pointer */
+ kchan = trace_kernel_get_channel_by_name(channel_name,
+ session->kernel_session);
+ if (kchan == NULL) {
+ /* This sould not happen... */
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+
+ ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
+ event);
+ if (ret != LTTCOMM_OK) {
+ goto error;
+ }
+
+ kernel_wait_quiescent(kernel_tracer_fd);
+ break;
+ }
+ case LTTNG_DOMAIN_UST:
+ {
+ struct ltt_ust_channel *uchan;
+ struct ltt_ust_session *usess = session->ust_session;
+
+ assert(usess);
+
+ /* Get channel from global UST domain */
+ uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
+ channel_name);
+ if (uchan == NULL) {
+ /* Create default channel */
+ attr = channel_new_default_attr(domain);
+ if (attr == NULL) {
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+ strncpy(attr->name, channel_name, sizeof(attr->name));
+
+ ret = cmd_enable_channel(session, domain, attr, wpipe);
+ if (ret != LTTCOMM_OK) {
+ free(attr);
+ goto error;
+ }
+ free(attr);
+
+ /* Get the newly created channel reference back */
+ uchan = trace_ust_find_channel_by_name(
+ usess->domain_global.channels, channel_name);
+ assert(uchan);
+ }
+
+ /* At this point, the session and channel exist on the tracer */
+ ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
+ if (ret != LTTCOMM_OK) {
+ goto error;
+ }
+ break;
+ }
+#if 0
+ case LTTNG_DOMAIN_UST_EXEC_NAME:
+ case LTTNG_DOMAIN_UST_PID:
+ case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
+#endif
+ default:
+ ret = LTTCOMM_UND;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+
+error:
+ return ret;
+}
+
+/*
+ * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
+ */
+int cmd_enable_event_all(struct ltt_session *session, int domain,
+ char *channel_name, int event_type, int wpipe)
+{
+ int ret;
+ struct lttng_channel *attr;
+
+ assert(session);
+ assert(channel_name);
+
+ switch (domain) {
+ case LTTNG_DOMAIN_KERNEL:
+ {
+ struct ltt_kernel_channel *kchan;
+
+ assert(session->kernel_session);
+
+ kchan = trace_kernel_get_channel_by_name(channel_name,
+ session->kernel_session);
+ if (kchan == NULL) {
+ /* Create default channel */
+ attr = channel_new_default_attr(domain);
+ if (attr == NULL) {
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+ strncpy(attr->name, channel_name, sizeof(attr->name));
+
+ ret = cmd_enable_channel(session, domain, attr, wpipe);
+ if (ret != LTTCOMM_OK) {
+ free(attr);
+ goto error;
+ }
+ free(attr);
+
+ /* Get the newly created kernel channel pointer */
+ kchan = trace_kernel_get_channel_by_name(channel_name,
+ session->kernel_session);
+ assert(kchan);
+ }
+
+ switch (event_type) {
+ case LTTNG_EVENT_SYSCALL:
+ ret = event_kernel_enable_all_syscalls(session->kernel_session,
+ kchan, kernel_tracer_fd);
+ break;
+ case LTTNG_EVENT_TRACEPOINT:
+ /*
+ * This call enables all LTTNG_KERNEL_TRACEPOINTS and
+ * events already registered to the channel.
+ */
+ ret = event_kernel_enable_all_tracepoints(session->kernel_session,
+ kchan, kernel_tracer_fd);
+ break;
+ case LTTNG_EVENT_ALL:
+ /* Enable syscalls and tracepoints */
+ ret = event_kernel_enable_all(session->kernel_session,
+ kchan, kernel_tracer_fd);
+ break;
+ default:
+ ret = LTTCOMM_KERN_ENABLE_FAIL;
+ goto error;
+ }
+
+ /* Manage return value */
+ if (ret != LTTCOMM_OK) {
+ goto error;
+ }
+
+ kernel_wait_quiescent(kernel_tracer_fd);
+ break;
+ }
+ case LTTNG_DOMAIN_UST:
+ {
+ struct ltt_ust_channel *uchan;
+ struct ltt_ust_session *usess = session->ust_session;
+
+ assert(usess);
+
+ /* Get channel from global UST domain */
+ uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
+ channel_name);
+ if (uchan == NULL) {
+ /* Create default channel */
+ attr = channel_new_default_attr(domain);
+ if (attr == NULL) {
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+ strncpy(attr->name, channel_name, sizeof(attr->name));
+
+ ret = cmd_enable_channel(session, domain, attr, wpipe);
+ if (ret != LTTCOMM_OK) {
+ free(attr);
+ goto error;
+ }
+ free(attr);
+
+ /* Get the newly created channel reference back */
+ uchan = trace_ust_find_channel_by_name(
+ usess->domain_global.channels, channel_name);
+ assert(uchan);
+ }
+
+ /* At this point, the session and channel exist on the tracer */
+
+ switch (event_type) {
+ case LTTNG_EVENT_ALL:
+ case LTTNG_EVENT_TRACEPOINT:
+ ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
+ if (ret != LTTCOMM_OK) {
+ goto error;
+ }
+ break;
+ default:
+ ret = LTTCOMM_UST_ENABLE_FAIL;
+ goto error;
+ }
+
+ /* Manage return value */
+ if (ret != LTTCOMM_OK) {
+ goto error;
+ }
+
+ break;
+ }
+#if 0
+ case LTTNG_DOMAIN_UST_EXEC_NAME:
+ case LTTNG_DOMAIN_UST_PID:
+ case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
+#endif
+ default:
+ ret = LTTCOMM_UND;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+
+error:
+ return ret;
+}
+
+
+/*
+ * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
+ */
+ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
+{
+ int ret;
+ ssize_t nb_events = 0;
+
+ switch (domain) {
+ case LTTNG_DOMAIN_KERNEL:
+ nb_events = kernel_list_events(kernel_tracer_fd, events);
+ if (nb_events < 0) {
+ ret = LTTCOMM_KERN_LIST_FAIL;
+ goto error;
+ }
+ break;
+ case LTTNG_DOMAIN_UST:
+ nb_events = ust_app_list_events(events);
+ if (nb_events < 0) {
+ ret = LTTCOMM_UST_LIST_FAIL;
+ goto error;
+ }
+ break;
+ default:
+ ret = LTTCOMM_UND;
+ goto error;
+ }
+
+ return nb_events;
+
+error:
+ /* Return negative value to differentiate return code */
+ return -ret;
+}
+
+/*
+ * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
+ */
+ssize_t cmd_list_tracepoint_fields(int domain,
+ struct lttng_event_field **fields)
+{
+ int ret;
+ ssize_t nb_fields = 0;
+
+ switch (domain) {
+ case LTTNG_DOMAIN_UST:
+ nb_fields = ust_app_list_event_fields(fields);
+ if (nb_fields < 0) {
+ ret = LTTCOMM_UST_LIST_FAIL;
+ goto error;
+ }
+ break;
+ case LTTNG_DOMAIN_KERNEL:
+ default: /* fall-through */
+ ret = LTTCOMM_UND;
+ goto error;
+ }
+
+ return nb_fields;
+
+error:
+ /* Return negative value to differentiate return code */
+ return -ret;
+}
+
+/*
+ * Command LTTNG_START_TRACE processed by the client thread.
+ */
+int cmd_start_trace(struct ltt_session *session)
+{
+ int ret;
+ struct ltt_kernel_session *ksession;
+ struct ltt_ust_session *usess;
+ struct ltt_kernel_channel *kchan;
+
+ assert(session);
+
+ /* Ease our life a bit ;) */
+ ksession = session->kernel_session;
+ usess = session->ust_session;
+
+ if (session->enabled) {
+ /* Already started. */
+ ret = LTTCOMM_TRACE_ALREADY_STARTED;
+ goto error;
+ }
+
+ session->enabled = 1;
+
+ ret = setup_relayd(session);
+ if (ret != LTTCOMM_OK) {
+ ERR("Error setting up relayd for session %s", session->name);
+ goto error;
+ }
+
+ /* Kernel tracing */
+ if (ksession != NULL) {
+ /* Open kernel metadata */
+ if (ksession->metadata == NULL) {
+ ret = kernel_open_metadata(ksession);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_META_FAIL;
+ goto error;
+ }
+ }
+
+ /* Open kernel metadata stream */
+ if (ksession->metadata_stream_fd < 0) {
+ ret = kernel_open_metadata_stream(ksession);
+ if (ret < 0) {
+ ERR("Kernel create metadata stream failed");
+ ret = LTTCOMM_KERN_STREAM_FAIL;
+ goto error;
+ }
+ }
+
+ /* For each channel */
+ cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
+ if (kchan->stream_count == 0) {
+ ret = kernel_open_channel_stream(kchan);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_STREAM_FAIL;
+ goto error;
+ }
+ /* Update the stream global counter */
+ ksession->stream_count_global += ret;
+ }
+ }
+
+ /* Setup kernel consumer socket and send fds to it */
+ ret = init_kernel_tracing(ksession);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_START_FAIL;
+ goto error;
+ }
+
+ /* This start the kernel tracing */
+ ret = kernel_start_session(ksession);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_START_FAIL;
+ goto error;
+ }
+
+ /* Quiescent wait after starting trace */
+ kernel_wait_quiescent(kernel_tracer_fd);
+ }
+
+ /* Flag session that trace should start automatically */
+ if (usess) {
+ usess->start_trace = 1;
+
+ ret = ust_app_start_trace_all(usess);
+ if (ret < 0) {
+ ret = LTTCOMM_UST_START_FAIL;
+ goto error;
+ }
+ }
+
+ ret = LTTCOMM_OK;
+
+error:
+ return ret;
+}
+
+/*
+ * Command LTTNG_STOP_TRACE processed by the client thread.
+ */
+int cmd_stop_trace(struct ltt_session *session)
+{
+ int ret;
+ struct ltt_kernel_channel *kchan;
+ struct ltt_kernel_session *ksession;
+ struct ltt_ust_session *usess;
+
+ assert(session);
+
+ /* Short cut */
+ ksession = session->kernel_session;
+ usess = session->ust_session;
+
+ if (!session->enabled) {
+ ret = LTTCOMM_TRACE_ALREADY_STOPPED;
+ goto error;
+ }
+
+ session->enabled = 0;
+
+ /* Kernel tracer */
+ if (ksession) {
+ DBG("Stop kernel tracing");
+
+ /* Flush metadata if exist */
+ if (ksession->metadata_stream_fd >= 0) {
+ ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
+ if (ret < 0) {
+ ERR("Kernel metadata flush failed");
+ }
+ }
+
+ /* Flush all buffers before stopping */
+ cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
+ ret = kernel_flush_buffer(kchan);
+ if (ret < 0) {
+ ERR("Kernel flush buffer error");
+ }
+ }
+
+ ret = kernel_stop_session(ksession);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_STOP_FAIL;
+ goto error;
+ }
+
+ kernel_wait_quiescent(kernel_tracer_fd);
+ }
+
+ if (usess) {
+ usess->start_trace = 0;
+
+ ret = ust_app_stop_trace_all(usess);
+ if (ret < 0) {
+ ret = LTTCOMM_UST_STOP_FAIL;
+ goto error;
+ }
+ }
+
+ ret = LTTCOMM_OK;
+
+error:
+ return ret;
+}
+
+/*
+ * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
+ */
+int cmd_set_consumer_uri(int domain, struct ltt_session *session,
+ size_t nb_uri, struct lttng_uri *uris)
+{
+ int ret, i;
+ struct ltt_kernel_session *ksess = session->kernel_session;
+ struct ltt_ust_session *usess = session->ust_session;
+ struct consumer_output *consumer = NULL;
+
+ assert(session);
+ assert(uris);
+ assert(nb_uri > 0);
+
+ /* Can't enable consumer after session started. */
+ if (session->enabled) {
+ ret = LTTCOMM_TRACE_ALREADY_STARTED;
+ goto error;
+ }
+
+ if (!session->start_consumer) {
+ ret = LTTCOMM_NO_CONSUMER;
+ goto error;
+ }
+
+ /*
+ * This case switch makes sure the domain session has a temporary consumer
+ * so the URL can be set.
+ */
+ switch (domain) {
+ case 0:
+ /* Code flow error. A session MUST always have a consumer object */
+ assert(session->consumer);
+ /*
+ * The URL will be added to the tracing session consumer instead of a
+ * specific domain consumer.
+ */
+ consumer = session->consumer;
+ break;
+ case LTTNG_DOMAIN_KERNEL:
+ /* Code flow error if we don't have a kernel session here. */
+ assert(ksess);
+
+ /* Create consumer output if none exists */
+ consumer = ksess->tmp_consumer;
+ if (consumer == NULL) {
+ consumer = consumer_copy_output(ksess->consumer);
+ if (consumer == NULL) {
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+ /* Trash the consumer subdir, we are about to set a new one. */
+ memset(consumer->subdir, 0, sizeof(consumer->subdir));
+ ksess->tmp_consumer = consumer;
+ }
+
+ break;
+ case LTTNG_DOMAIN_UST:
+ /* Code flow error if we don't have a kernel session here. */
+ assert(usess);
+
+ /* Create consumer output if none exists */
+ consumer = usess->tmp_consumer;
+ if (consumer == NULL) {
+ consumer = consumer_copy_output(usess->consumer);
+ if (consumer == NULL) {
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+ /* Trash the consumer subdir, we are about to set a new one. */
+ memset(consumer->subdir, 0, sizeof(consumer->subdir));
+ usess->tmp_consumer = consumer;
+ }
+
+ break;
+ }
+
+ for (i = 0; i < nb_uri; i++) {
+ struct consumer_socket *socket;
+ struct lttng_ht_iter iter;
+
+ ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
+ if (ret < 0) {
+ goto error;
+ }
+
+ /*
+ * Don't send relayd socket if URI is NOT remote or if the relayd
+ * sockets for the session are already sent.
+ */
+ if (uris[i].dtype == LTTNG_DST_PATH ||
+ consumer->dst.net.relayd_socks_sent) {
+ continue;
+ }
+
+ /* Try to send relayd URI to the consumer if exist. */
+ rcu_read_lock();
+ cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter,
+ socket, node.node) {
+
+ /* A socket in the HT should never have a negative fd */
+ assert(socket->fd >= 0);
+
+ pthread_mutex_lock(socket->lock);
+ ret = send_consumer_relayd_socket(domain, session, &uris[i],
+ consumer, socket->fd);
+ pthread_mutex_unlock(socket->lock);
+ if (ret != LTTCOMM_OK) {
+ rcu_read_unlock();
+ goto error;
+ }
+ }
+ rcu_read_unlock();
+ }
+
+ /* All good! */
+ ret = LTTCOMM_OK;
+
+error:
+ return ret;
+}
+
+/*
+ * Command LTTNG_CREATE_SESSION processed by the client thread.
+ */
+int cmd_create_session_uri(char *name, struct lttng_uri *uris,
+ size_t nb_uri, lttng_sock_cred *creds)
+{
+ int ret;
+ char *path = NULL;
+ struct ltt_session *session;
+
+ assert(name);
+
+ /*
+ * Verify if the session already exist
+ *
+ * XXX: There is no need for the session lock list here since the caller
+ * (process_client_msg) is holding it. We might want to change that so a
+ * single command does not lock the entire session list.
+ */
+ session = session_find_by_name(name);
+ if (session != NULL) {
+ ret = LTTCOMM_EXIST_SESS;
+ goto find_error;
+ }
+
+ /* Create tracing session in the registry */
+ ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds),
+ LTTNG_SOCK_GET_GID_CRED(creds));
+ if (ret != LTTCOMM_OK) {
+ goto session_error;
+ }
+
+ /*
+ * Get the newly created session pointer back
+ *
+ * XXX: There is no need for the session lock list here since the caller
+ * (process_client_msg) is holding it. We might want to change that so a
+ * single command does not lock the entire session list.
+ */
+ session = session_find_by_name(name);
+ assert(session);
+
+ /* Create default consumer output for the session not yet created. */
+ session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
+ if (session->consumer == NULL) {
+ ret = LTTCOMM_FATAL;
+ goto consumer_error;
+ }
+
+ /*
+ * This means that the lttng_create_session call was called with the _path_
+ * argument set to NULL.
+ */
+ if (uris == NULL) {
+ /*
+ * At this point, we'll skip the consumer URI setup and create a
+ * session with a NULL path which will flag the session to NOT spawn a
+ * consumer.
+ */
+ DBG("Create session %s with NO uri, skipping consumer setup", name);
+ goto end;
+ }
+
+ session->start_consumer = 1;
+
+ ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
+ if (ret != LTTCOMM_OK) {
+ goto consumer_error;
+ }
+
+ session->consumer->enabled = 1;
+
+end:
+ return LTTCOMM_OK;
+
+consumer_error:
+ session_destroy(session);
+session_error:
+find_error:
+ return ret;
+}
+
+/*
+ * Command LTTNG_DESTROY_SESSION processed by the client thread.
+ */
+int cmd_destroy_session(struct ltt_session *session, int wpipe)
+{
+ int ret;
+ struct ltt_ust_session *usess;
+ struct ltt_kernel_session *ksess;
+
+ /* Safety net */
+ assert(session);
+
+ usess = session->ust_session;
+ ksess = session->kernel_session;
+
+ /* Clean kernel session teardown */
+ kernel_destroy_session(ksess);
+
+ /* UST session teardown */
+ if (usess) {
+ /* Close any relayd session */
+ consumer_output_send_destroy_relayd(usess->consumer);
+
+ /* Destroy every UST application related to this session. */
+ ret = ust_app_destroy_trace_all(usess);
+ if (ret) {
+ ERR("Error in ust_app_destroy_trace_all");
+ }
+
+ /* Clean up the rest. */
+ trace_ust_destroy_session(usess);
+ }
+
+ /*
+ * Must notify the kernel thread here to update it's poll set in order to
+ * remove the channel(s)' fd just destroyed.
+ */
+ ret = notify_thread_pipe(wpipe);
+ if (ret < 0) {
+ PERROR("write kernel poll pipe");
+ }
+
+ ret = session_destroy(session);
+
+ return ret;
+}
+
+/*
+ * Command LTTNG_CALIBRATE processed by the client thread.
+ */
+int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
+{
+ int ret;
+
+ switch (domain) {
+ case LTTNG_DOMAIN_KERNEL:
+ {
+ struct lttng_kernel_calibrate kcalibrate;
+
+ kcalibrate.type = calibrate->type;
+ ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_ENABLE_FAIL;
+ goto error;
+ }
+ break;
+ }
+ case LTTNG_DOMAIN_UST:
+ {
+ struct lttng_ust_calibrate ucalibrate;
+
+ ucalibrate.type = calibrate->type;
+ ret = ust_app_calibrate_glb(&ucalibrate);
+ if (ret < 0) {
+ ret = LTTCOMM_UST_CALIBRATE_FAIL;
+ goto error;
+ }
+ break;
+ }
+ default:
+ ret = LTTCOMM_UND;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+
+error:
+ return ret;
+}
+
+/*
+ * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
+ */
+int cmd_register_consumer(struct ltt_session *session, int domain,
+ const char *sock_path, struct consumer_data *cdata)
+{
+ int ret, sock;
+ struct consumer_socket *socket;
+
+ assert(session);
+ assert(cdata);
+ assert(sock_path);
+
+ switch (domain) {
+ case LTTNG_DOMAIN_KERNEL:
+ {
+ struct ltt_kernel_session *ksess = session->kernel_session;
+
+ assert(ksess);
+
+ /* Can't register a consumer if there is already one */
+ if (ksess->consumer_fds_sent != 0) {
+ ret = LTTCOMM_KERN_CONSUMER_FAIL;
+ goto error;
+ }
+
+ sock = lttcomm_connect_unix_sock(sock_path);
+ if (sock < 0) {
+ ret = LTTCOMM_CONNECT_FAIL;
+ goto error;
+ }
+
+ socket = consumer_allocate_socket(sock);
+ if (socket == NULL) {
+ ret = LTTCOMM_FATAL;
+ close(sock);
+ goto error;
+ }
+
+ socket->lock = zmalloc(sizeof(pthread_mutex_t));
+ if (socket->lock == NULL) {
+ PERROR("zmalloc pthread mutex");
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+ pthread_mutex_init(socket->lock, NULL);
+ socket->registered = 1;
+
+ rcu_read_lock();
+ consumer_add_socket(socket, ksess->consumer);
+ rcu_read_unlock();
+
+ pthread_mutex_lock(&cdata->pid_mutex);
+ cdata->pid = -1;
+ pthread_mutex_unlock(&cdata->pid_mutex);
+
+ break;
+ }
+ default:
+ /* TODO: Userspace tracing */
+ ret = LTTCOMM_UND;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+
+error:
+ return ret;
+}
+
+/*
+ * Command LTTNG_LIST_DOMAINS processed by the client thread.
+ */
+ssize_t cmd_list_domains(struct ltt_session *session,
+ struct lttng_domain **domains)
+{
+ int ret, index = 0;
+ ssize_t nb_dom = 0;
+
+ if (session->kernel_session != NULL) {
+ DBG3("Listing domains found kernel domain");
+ nb_dom++;
+ }
+
+ if (session->ust_session != NULL) {
+ DBG3("Listing domains found UST global domain");
+ nb_dom++;
+ }
+
+ *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
+ if (*domains == NULL) {
+ ret = -LTTCOMM_FATAL;
+ goto error;
+ }
+
+ if (session->kernel_session != NULL) {
+ (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
+ index++;
+ }
+
+ if (session->ust_session != NULL) {
+ (*domains)[index].type = LTTNG_DOMAIN_UST;
+ index++;
+ }
+
+ return nb_dom;
+
+error:
+ return ret;
+}
+
+
+/*
+ * Command LTTNG_LIST_CHANNELS processed by the client thread.
+ */
+ssize_t cmd_list_channels(int domain, struct ltt_session *session,
+ struct lttng_channel **channels)
+{
+ int ret;
+ ssize_t nb_chan = 0;
+
+ switch (domain) {
+ case LTTNG_DOMAIN_KERNEL:
+ if (session->kernel_session != NULL) {
+ nb_chan = session->kernel_session->channel_count;
+ }
+ DBG3("Number of kernel channels %zd", nb_chan);
+ break;
+ case LTTNG_DOMAIN_UST:
+ if (session->ust_session != NULL) {
+ nb_chan = lttng_ht_get_count(
+ session->ust_session->domain_global.channels);
+ }
+ DBG3("Number of UST global channels %zd", nb_chan);
+ break;
+ default:
+ *channels = NULL;
+ ret = -LTTCOMM_UND;
+ goto error;
+ }
+
+ if (nb_chan > 0) {
+ *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
+ if (*channels == NULL) {
+ ret = -LTTCOMM_FATAL;
+ goto error;
+ }
+
+ list_lttng_channels(domain, session, *channels);
+ } else {
+ *channels = NULL;
+ }
+
+ return nb_chan;
+
+error:
+ return ret;
+}
+
+/*
+ * Command LTTNG_LIST_EVENTS processed by the client thread.
+ */
+ssize_t cmd_list_events(int domain, struct ltt_session *session,
+ char *channel_name, struct lttng_event **events)
+{
+ int ret = 0;
+ ssize_t nb_event = 0;
+
+ switch (domain) {
+ case LTTNG_DOMAIN_KERNEL:
+ if (session->kernel_session != NULL) {
+ nb_event = list_lttng_kernel_events(channel_name,
+ session->kernel_session, events);
+ }
+ break;
+ case LTTNG_DOMAIN_UST:
+ {
+ if (session->ust_session != NULL) {
+ nb_event = list_lttng_ust_global_events(channel_name,
+ &session->ust_session->domain_global, events);
+ }
+ break;
+ }
+ default:
+ ret = -LTTCOMM_UND;
+ goto error;
+ }
+
+ ret = nb_event;
+
+error:
+ return ret;
+}
+
+/*
+ * Using the session list, filled a lttng_session array to send back to the
+ * client for session listing.
+ *
+ * The session list lock MUST be acquired before calling this function. Use
+ * session_lock_list() and session_unlock_list().
+ */
+void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
+ gid_t gid)
+{
+ int ret;
+ unsigned int i = 0;
+ struct ltt_session *session;
+ struct ltt_session_list *list = session_get_list();
+
+ DBG("Getting all available session for UID %d GID %d",
+ uid, gid);
+ /*
+ * Iterate over session list and append data after the control struct in
+ * the buffer.
+ */
+ cds_list_for_each_entry(session, &list->head, list) {
+ /*
+ * Only list the sessions the user can control.
+ */
+ if (!session_access_ok(session, uid, gid)) {
+ continue;
+ }
+
+ struct ltt_kernel_session *ksess = session->kernel_session;
+ struct ltt_ust_session *usess = session->ust_session;
+
+ if (session->consumer->type == CONSUMER_DST_NET ||
+ (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
+ (usess && usess->consumer->type == CONSUMER_DST_NET)) {
+ ret = build_network_session_path(sessions[i].path,
+ sizeof(session[i].path), session);
+ } else {
+ ret = snprintf(sessions[i].path, sizeof(session[i].path), "%s",
+ session->consumer->dst.trace_path);
+ }
+ if (ret < 0) {
+ PERROR("snprintf session path");
+ continue;
+ }
+
+ strncpy(sessions[i].name, session->name, NAME_MAX);
+ sessions[i].name[NAME_MAX - 1] = '\0';
+ sessions[i].enabled = session->enabled;
+ i++;
+ }
+}
+
+/*
+ * Command LTTNG_DISABLE_CONSUMER processed by the client thread.
+ */
+int cmd_disable_consumer(int domain, struct ltt_session *session)
+{
+ int ret;
+ struct ltt_kernel_session *ksess = session->kernel_session;
+ struct ltt_ust_session *usess = session->ust_session;
+ struct consumer_output *consumer;
+
+ assert(session);
+
+ if (session->enabled) {
+ /* Can't disable consumer on an already started session */
+ ret = LTTCOMM_TRACE_ALREADY_STARTED;
+ goto error;
+ }
+
+ if (!session->start_consumer) {
+ ret = LTTCOMM_NO_CONSUMER;
+ goto error;
+ }
+
+ switch (domain) {
+ case 0:
+ DBG("Disable tracing session %s consumer", session->name);
+ consumer = session->consumer;
+ break;
+ case LTTNG_DOMAIN_KERNEL:
+ /* Code flow error if we don't have a kernel session here. */
+ assert(ksess);
+
+ DBG("Disabling kernel consumer");
+ consumer = ksess->consumer;
+
+ break;
+ case LTTNG_DOMAIN_UST:
+ /* Code flow error if we don't have a UST session here. */
+ assert(usess);
+
+ DBG("Disabling UST consumer");
+ consumer = usess->consumer;
+
+ break;
+ default:
+ ret = LTTCOMM_UNKNOWN_DOMAIN;
+ goto error;
+ }
+
+ if (consumer) {
+ consumer->enabled = 0;
+ /* Success at this point */
+ ret = LTTCOMM_OK;
+ } else {
+ ret = LTTCOMM_NO_CONSUMER;
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * Command LTTNG_ENABLE_CONSUMER processed by the client thread.
+ */
+int cmd_enable_consumer(int domain, struct ltt_session *session)
+{
+ int ret;
+ struct ltt_kernel_session *ksess = session->kernel_session;
+ struct ltt_ust_session *usess = session->ust_session;
+ struct consumer_output *consumer = NULL;
+
+ assert(session);
+
+ /* Can't enable consumer after session started. */
+ if (session->enabled) {
+ ret = LTTCOMM_TRACE_ALREADY_STARTED;
+ goto error;
+ }
+
+ if (!session->start_consumer) {
+ ret = LTTCOMM_NO_CONSUMER;
+ goto error;
+ }
+
+ switch (domain) {
+ case 0:
+ assert(session->consumer);
+ consumer = session->consumer;
+ break;
+ case LTTNG_DOMAIN_KERNEL:
+ /* Code flow error if we don't have a kernel session here. */
+ assert(ksess);
+
+ /*
+ * Check if we have already sent fds to the consumer. In that case,
+ * the enable-consumer command can't be used because a start trace
+ * had previously occured.
+ */
+ if (ksess->consumer_fds_sent) {
+ ret = LTTCOMM_ENABLE_CONSUMER_FAIL;
+ goto error;
+ }
+
+ consumer = ksess->tmp_consumer;
+ if (consumer == NULL) {
+ ret = LTTCOMM_OK;
+ /* No temp. consumer output exists. Using the current one. */
+ DBG3("No temporary consumer. Using default");
+ consumer = ksess->consumer;
+ goto error;
+ }
+
+ switch (consumer->type) {
+ case CONSUMER_DST_LOCAL:
+ DBG2("Consumer output is local. Creating directory(ies)");
+
+ /* Create directory(ies) */
+ ret = run_as_mkdir_recursive(consumer->dst.trace_path,
+ S_IRWXU | S_IRWXG, session->uid, session->gid);
+ if (ret < 0) {
+ if (ret != -EEXIST) {
+ ERR("Trace directory creation error");
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+ }
+ break;
+ case CONSUMER_DST_NET:
+ DBG2("Consumer output is network. Validating URIs");
+ /* Validate if we have both control and data path set. */
+ if (!consumer->dst.net.control_isset) {
+ ret = LTTCOMM_URL_CTRL_MISS;
+ goto error;
+ }
+
+ if (!consumer->dst.net.data_isset) {
+ ret = LTTCOMM_URL_DATA_MISS;
+ goto error;
+ }
+
+ /* Check established network session state */
+ if (session->net_handle == 0) {
+ ret = LTTCOMM_ENABLE_CONSUMER_FAIL;
+ ERR("Session network handle is not set on enable-consumer");
+ goto error;
+ }
+
+ break;
+ }
+
+ /* Append default kernel trace dir to subdir */
+ strncat(ksess->consumer->subdir, DEFAULT_KERNEL_TRACE_DIR,
+ sizeof(ksess->consumer->subdir));
+
+ /*
+ * @session-lock
+ * This is race free for now since the session lock is acquired before
+ * ending up in this function. No other threads can access this kernel
+ * session without this lock hence freeing the consumer output object
+ * is valid.
+ */
+ rcu_read_lock();
+ consumer_destroy_output(ksess->consumer);
+ rcu_read_unlock();
+ ksess->consumer = consumer;
+ ksess->tmp_consumer = NULL;
+
+ break;
+ case LTTNG_DOMAIN_UST:
+ /* Code flow error if we don't have a UST session here. */
+ assert(usess);
+
+ /*
+ * Check if we have already sent fds to the consumer. In that case,
+ * the enable-consumer command can't be used because a start trace
+ * had previously occured.
+ */
+ if (usess->start_trace) {
+ ret = LTTCOMM_ENABLE_CONSUMER_FAIL;
+ goto error;
+ }
+
+ consumer = usess->tmp_consumer;
+ if (consumer == NULL) {
+ ret = LTTCOMM_OK;
+ /* No temp. consumer output exists. Using the current one. */
+ DBG3("No temporary consumer. Using default");
+ consumer = usess->consumer;
+ goto error;
+ }
+
+ switch (consumer->type) {
+ case CONSUMER_DST_LOCAL:
+ DBG2("Consumer output is local. Creating directory(ies)");
+
+ /* Create directory(ies) */
+ ret = run_as_mkdir_recursive(consumer->dst.trace_path,
+ S_IRWXU | S_IRWXG, session->uid, session->gid);
+ if (ret < 0) {
+ if (ret != -EEXIST) {
+ ERR("Trace directory creation error");
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+ }
+ break;
+ case CONSUMER_DST_NET:
+ DBG2("Consumer output is network. Validating URIs");
+ /* Validate if we have both control and data path set. */
+ if (!consumer->dst.net.control_isset) {
+ ret = LTTCOMM_URL_CTRL_MISS;
+ goto error;
+ }
+
+ if (!consumer->dst.net.data_isset) {
+ ret = LTTCOMM_URL_DATA_MISS;
+ goto error;
+ }
+
+ /* Check established network session state */
+ if (session->net_handle == 0) {
+ ret = LTTCOMM_ENABLE_CONSUMER_FAIL;
+ DBG2("Session network handle is not set on enable-consumer");
+ goto error;
+ }
+
+ if (consumer->net_seq_index == -1) {
+ ret = LTTCOMM_ENABLE_CONSUMER_FAIL;
+ DBG2("Network index is not set on the consumer");
+ goto error;
+ }
+
+ break;
+ }
+
+ /* Append default kernel trace dir to subdir */
+ strncat(usess->consumer->subdir, DEFAULT_UST_TRACE_DIR,
+ sizeof(usess->consumer->subdir));
+
+ /*
+ * @session-lock
+ * This is race free for now since the session lock is acquired before
+ * ending up in this function. No other threads can access this kernel
+ * session without this lock hence freeing the consumer output object
+ * is valid.
+ */
+ rcu_read_lock();
+ consumer_destroy_output(usess->consumer);
+ rcu_read_unlock();
+ usess->consumer = consumer;
+ usess->tmp_consumer = NULL;
+
+ break;
+ }
+
+ /* Enable it */
+ if (consumer) {
+ consumer->enabled = 1;
+ /* Success at this point */
+ ret = LTTCOMM_OK;
+ } else {
+ /* Should not really happend... */
+ ret = LTTCOMM_NO_CONSUMER;
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * Init command subsystem.
+ */
+void cmd_init(void)
+{
+ /*
+ * Set network sequence index to 1 for streams to match a relayd socket on
+ * the consumer side.
+ */
+ uatomic_set(&relayd_net_seq_idx, 1);
+
+ DBG("Command subsystem initialized");
+}
#include "lttng-sessiond.h"
#include "channel.h"
+#include "cmd.h"
#include "consumer.h"
#include "context.h"
#include "event.h"
/* Sockets and FDs */
static int client_sock = -1;
static int apps_sock = -1;
-static int kernel_tracer_fd = -1;
+int kernel_tracer_fd = -1;
static int kernel_poll_pipe[2] = { -1, -1 };
/*
static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
+static const char *module_proc_lttng = "/proc/lttng";
+
/*
* Consumer daemon state which is changed when spawning it, killing it or in
* case of a fatal error.
static enum consumerd_state ust_consumerd_state;
static enum consumerd_state kernel_consumerd_state;
-/*
- * Used to keep a unique index for each relayd socket created where this value
- * is associated with streams on the consumer so it can match the right relayd
- * to send to.
- *
- * This value should be incremented atomically for safety purposes and future
- * possible concurrent access.
- */
-static unsigned int relayd_net_seq_idx;
-
/* Used for the health monitoring of the session daemon. See health.h */
struct health_state health_thread_cmd;
struct health_state health_thread_app_manage;
return ret;
}
-/*
- * Complete teardown of a kernel session. This free all data structure related
- * to a kernel session and update counter.
- */
-static void teardown_kernel_session(struct ltt_session *session)
-{
- int ret;
- struct lttng_ht_iter iter;
- struct ltt_kernel_session *ksess;
- struct consumer_socket *socket;
-
- if (!session->kernel_session) {
- DBG3("No kernel session when tearing down session");
- return;
- }
-
- ksess = session->kernel_session;
-
- DBG("Tearing down kernel session");
-
- /*
- * Destroy relayd associated with the session consumer. This action is
- * valid since in order to destroy a session we must acquire the session
- * lock. This means that there CAN NOT be stream(s) being sent to a
- * consumer since this action also requires the session lock at any time.
- *
- * At this point, we are sure that not streams data will be lost after this
- * command is issued.
- */
- if (ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET) {
- cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, socket,
- node.node) {
- ret = consumer_send_destroy_relayd(socket, ksess->consumer);
- if (ret < 0) {
- ERR("Unable to send destroy relayd command to consumer");
- /* Continue since we MUST delete everything at this point. */
- }
- }
- }
-
- /*
- * If a custom kernel consumer was registered, close the socket before
- * tearing down the complete kernel session structure
- */
- cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, socket,
- node.node) {
- if (socket->fd != kconsumer_data.cmd_sock) {
- rcu_read_lock();
- consumer_del_socket(socket, ksess->consumer);
- lttcomm_close_unix_sock(socket->fd);
- consumer_destroy_socket(socket);
- rcu_read_unlock();
- }
- }
-
- trace_kernel_destroy_session(ksess);
-}
-
-/*
- * Complete teardown of all UST sessions. This will free everything on his path
- * and destroy the core essence of all ust sessions :)
- */
-static void teardown_ust_session(struct ltt_session *session)
-{
- int ret;
- struct lttng_ht_iter iter;
- struct ltt_ust_session *usess;
- struct consumer_socket *socket;
-
- if (!session->ust_session) {
- DBG3("No UST session when tearing down session");
- return;
- }
- usess = session->ust_session;
-
- DBG("Tearing down UST session(s)");
-
- /*
- * Destroy relayd associated with the session consumer. This action is
- * valid since in order to destroy a session we must acquire the session
- * lock. This means that there CAN NOT be stream(s) being sent to a
- * consumer since this action also requires the session lock at any time.
- *
- * At this point, we are sure that no data will be lost after this command
- * is issued.
- */
- if (usess->consumer && usess->consumer->type == CONSUMER_DST_NET) {
- cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter, socket,
- node.node) {
- ret = consumer_send_destroy_relayd(socket, usess->consumer);
- if (ret < 0) {
- ERR("Unable to send destroy relayd command to consumer");
- /* Continue since we MUST delete everything at this point. */
- }
- }
- }
-
- ret = ust_app_destroy_trace_all(usess);
- if (ret) {
- ERR("Error in ust_app_destroy_trace_all");
- }
-
- trace_ust_destroy_session(usess);
-}
-
/*
* Stop all threads by closing the thread quit pipe.
*/
DBG("Cleaning up");
+ /* First thing first, stop all threads */
+ utils_close_pipe(thread_quit_pipe);
+
DBG("Removing %s directory", rundir);
ret = asprintf(&cmd, "rm -rf %s", rundir);
if (ret < 0) {
/* Cleanup ALL session */
cds_list_for_each_entry_safe(sess, stmp,
&session_list_ptr->head, list) {
- teardown_kernel_session(sess);
- teardown_ust_session(sess);
- free(sess);
+ cmd_destroy_session(sess, kernel_poll_pipe[1]);
}
}
DBG("Unloading kernel modules");
modprobe_remove_lttng_all();
}
+
utils_close_pipe(kernel_poll_pipe);
- utils_close_pipe(thread_quit_pipe);
utils_close_pipe(apps_cmd_pipe);
/* <fun> */
return ret;
}
-/*
- * Check version of the lttng-modules.
- */
-static int validate_lttng_modules_version(void)
-{
- return kernel_validate_version(kernel_tracer_fd);
-}
-
/*
* Setup necessary data for kernel tracer action.
*/
kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
if (kernel_tracer_fd < 0) {
DBG("Failed to open %s", module_proc_lttng);
- ret = -1;
- goto error_open;
- }
-
- /* Validate kernel version */
- ret = validate_lttng_modules_version();
- if (ret < 0) {
- goto error_version;
- }
-
- ret = modprobe_lttng_data();
- if (ret < 0) {
- goto error_modules;
- }
-
- DBG("Kernel tracer fd %d", kernel_tracer_fd);
- return 0;
-
-error_version:
- modprobe_remove_lttng_control();
- ret = close(kernel_tracer_fd);
- if (ret) {
- PERROR("close");
- }
- kernel_tracer_fd = -1;
- return LTTCOMM_KERN_VERSION;
-
-error_modules:
- ret = close(kernel_tracer_fd);
- if (ret) {
- PERROR("close");
- }
-
-error_open:
- modprobe_remove_lttng_control();
-
-error:
- WARN("No kernel tracer available");
- kernel_tracer_fd = -1;
- if (!is_root) {
- return LTTCOMM_NEED_ROOT_SESSIOND;
- } else {
- return LTTCOMM_KERN_NA;
- }
-}
-
-/*
- * Init tracing by creating trace directory and sending fds kernel consumer.
- */
-static int init_kernel_tracing(struct ltt_kernel_session *session)
-{
- int ret = 0;
- struct lttng_ht_iter iter;
- struct consumer_socket *socket;
-
- assert(session);
-
- if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
- cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
- socket, node.node) {
- /* Code flow error */
- assert(socket->fd >= 0);
-
- pthread_mutex_lock(socket->lock);
- ret = kernel_consumer_send_session(socket->fd, session);
- pthread_mutex_unlock(socket->lock);
- if (ret < 0) {
- ret = LTTCOMM_KERN_CONSUMER_FAIL;
- goto error;
- }
- }
- }
-
-error:
- return ret;
-}
-
-/*
- * Create a socket to the relayd using the URI.
- *
- * On success, the relayd_sock pointer is set to the created socket.
- * Else, it is untouched and an lttcomm error code is returned.
- */
-static int create_connect_relayd(struct consumer_output *output,
- const char *session_name, struct lttng_uri *uri,
- struct lttcomm_sock **relayd_sock)
-{
- int ret;
- struct lttcomm_sock *sock;
-
- /* Create socket object from URI */
- sock = lttcomm_alloc_sock_from_uri(uri);
- if (sock == NULL) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
-
- ret = lttcomm_create_sock(sock);
- if (ret < 0) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
-
- /* Connect to relayd so we can proceed with a session creation. */
- ret = relayd_connect(sock);
- if (ret < 0) {
- ERR("Unable to reach lttng-relayd");
- ret = LTTCOMM_RELAYD_SESSION_FAIL;
- goto free_sock;
- }
-
- /* Create socket for control stream. */
- if (uri->stype == LTTNG_STREAM_CONTROL) {
- DBG3("Creating relayd stream socket from URI");
-
- /* Check relayd version */
- ret = relayd_version_check(sock, RELAYD_VERSION_COMM_MAJOR,
- RELAYD_VERSION_COMM_MINOR);
- if (ret < 0) {
- ret = LTTCOMM_RELAYD_VERSION_FAIL;
- goto close_sock;
- }
- } else if (uri->stype == LTTNG_STREAM_DATA) {
- DBG3("Creating relayd data socket from URI");
- } else {
- /* Command is not valid */
- ERR("Relayd invalid stream type: %d", uri->stype);
- ret = LTTCOMM_INVALID;
- goto close_sock;
- }
-
- *relayd_sock = sock;
-
- return LTTCOMM_OK;
-
-close_sock:
- if (sock) {
- (void) relayd_close(sock);
- }
-free_sock:
- if (sock) {
- lttcomm_destroy_sock(sock);
- }
-error:
- return ret;
-}
-
-/*
- * Connect to the relayd using URI and send the socket to the right consumer.
- */
-static int send_socket_relayd_consumer(int domain, struct ltt_session *session,
- struct lttng_uri *relayd_uri, struct consumer_output *consumer,
- int consumer_fd)
-{
- int ret;
- struct lttcomm_sock *sock = NULL;
-
- /* Set the network sequence index if not set. */
- if (consumer->net_seq_index == -1) {
- /*
- * Increment net_seq_idx because we are about to transfer the
- * new relayd socket to the consumer.
- */
- uatomic_inc(&relayd_net_seq_idx);
- /* Assign unique key so the consumer can match streams */
- consumer->net_seq_index = uatomic_read(&relayd_net_seq_idx);
- }
-
- /* Connect to relayd and make version check if uri is the control. */
- ret = create_connect_relayd(consumer, session->name, relayd_uri, &sock);
- if (ret != LTTCOMM_OK) {
- goto close_sock;
- }
-
- /* If the control socket is connected, network session is ready */
- if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
- session->net_handle = 1;
- }
-
- /* Send relayd socket to consumer. */
- ret = consumer_send_relayd_socket(consumer_fd, sock,
- consumer, relayd_uri->stype);
- if (ret < 0) {
- ret = LTTCOMM_ENABLE_CONSUMER_FAIL;
- goto close_sock;
- }
-
- ret = LTTCOMM_OK;
-
- /*
- * Close socket which was dup on the consumer side. The session daemon does
- * NOT keep track of the relayd socket(s) once transfer to the consumer.
- */
-
-close_sock:
- if (sock) {
- (void) relayd_close(sock);
- lttcomm_destroy_sock(sock);
- }
-
- return ret;
-}
-
-/*
- * Send both relayd sockets to a specific consumer and domain. This is a
- * helper function to facilitate sending the information to the consumer for a
- * session.
- */
-static int send_sockets_relayd_consumer(int domain,
- struct ltt_session *session, struct consumer_output *consumer, int fd)
-{
- int ret;
-
- assert(session);
- assert(consumer);
-
- /* Don't resend the sockets to the consumer. */
- if (consumer->dst.net.relayd_socks_sent) {
- ret = LTTCOMM_OK;
- goto error;
- }
-
- /* Sending control relayd socket. */
- ret = send_socket_relayd_consumer(domain, session,
- &consumer->dst.net.control, consumer, fd);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- /* Sending data relayd socket. */
- ret = send_socket_relayd_consumer(domain, session,
- &consumer->dst.net.data, consumer, fd);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- /* Flag that all relayd sockets were sent to the consumer. */
- consumer->dst.net.relayd_socks_sent = 1;
-
-error:
- return ret;
-}
-
-/*
- * Setup relayd connections for a tracing session. First creates the socket to
- * the relayd and send them to the right domain consumer. Consumer type MUST be
- * network.
- */
-static int setup_relayd(struct ltt_session *session)
-{
- int ret = LTTCOMM_OK;
- struct ltt_ust_session *usess;
- struct ltt_kernel_session *ksess;
- struct consumer_socket *socket;
- struct lttng_ht_iter iter;
-
- assert(session);
-
- usess = session->ust_session;
- ksess = session->kernel_session;
-
- DBG2("Setting relayd for session %s", session->name);
-
- if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
- && usess->consumer->enabled) {
- /* For each consumer socket, send relayd sockets */
- cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
- socket, node.node) {
- /* Code flow error */
- assert(socket->fd >= 0);
-
- pthread_mutex_lock(socket->lock);
- send_sockets_relayd_consumer(LTTNG_DOMAIN_UST, session,
- usess->consumer, socket->fd);
- pthread_mutex_unlock(socket->lock);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
- }
- }
-
- if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
- && ksess->consumer->enabled) {
- cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
- socket, node.node) {
- /* Code flow error */
- assert(socket->fd >= 0);
-
- pthread_mutex_lock(socket->lock);
- send_sockets_relayd_consumer(LTTNG_DOMAIN_KERNEL, session,
- ksess->consumer, socket->fd);
- pthread_mutex_unlock(socket->lock);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
- }
- }
-
-error:
- return ret;
-}
-
-/*
- * Set consumer subdirectory using the session name and a generated datetime if
- * needed. This is appended to the current subdirectory.
- */
-static int set_consumer_subdir(struct consumer_output *consumer,
- const char *session_name)
-{
- int ret = 0;
- unsigned int have_default_name = 0;
- char datetime[16], tmp_path[PATH_MAX];
- time_t rawtime;
- struct tm *timeinfo;
-
- assert(consumer);
- assert(session_name);
-
- memset(tmp_path, 0, sizeof(tmp_path));
-
- /* Flag if we have a default session. */
- if (strncmp(session_name, DEFAULT_SESSION_NAME "-",
- strlen(DEFAULT_SESSION_NAME) + 1) == 0) {
- have_default_name = 1;
- } else {
- /* Get date and time for session path */
- time(&rawtime);
- timeinfo = localtime(&rawtime);
- strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
- }
-
- if (have_default_name) {
- ret = snprintf(tmp_path, sizeof(tmp_path),
- "%s/%s", consumer->subdir, session_name);
- } else {
- ret = snprintf(tmp_path, sizeof(tmp_path),
- "%s/%s-%s/", consumer->subdir, session_name, datetime);
- }
- if (ret < 0) {
- PERROR("snprintf session name date");
- goto error;
- }
-
- strncpy(consumer->subdir, tmp_path, sizeof(consumer->subdir));
- DBG2("Consumer subdir set to %s", consumer->subdir);
-
-error:
- return ret;
-}
-
-/*
- * Copy consumer output from the tracing session to the domain session. The
- * function also applies the right modification on a per domain basis for the
- * trace files destination directory.
- */
-static int copy_session_consumer(int domain, struct ltt_session *session)
-{
- int ret;
- const char *dir_name;
- struct consumer_output *consumer;
-
- assert(session);
- assert(session->consumer);
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- DBG3("Copying tracing session consumer output in kernel session");
- session->kernel_session->consumer =
- consumer_copy_output(session->consumer);
- /* Ease our life a bit for the next part */
- consumer = session->kernel_session->consumer;
- dir_name = DEFAULT_KERNEL_TRACE_DIR;
- break;
- case LTTNG_DOMAIN_UST:
- DBG3("Copying tracing session consumer output in UST session");
- session->ust_session->consumer =
- consumer_copy_output(session->consumer);
- /* Ease our life a bit for the next part */
- consumer = session->ust_session->consumer;
- dir_name = DEFAULT_UST_TRACE_DIR;
- break;
- default:
- ret = LTTCOMM_UNKNOWN_DOMAIN;
- goto error;
- }
-
- ret = set_consumer_subdir(session->consumer, session->name);
- if (ret < 0) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
-
- /* Append correct directory to subdir */
- strncat(consumer->subdir, dir_name, sizeof(consumer->subdir));
- DBG3("Copy session consumer subdir %s", consumer->subdir);
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Create an UST session and add it to the session ust list.
- */
-static int create_ust_session(struct ltt_session *session,
- struct lttng_domain *domain)
-{
- int ret;
- struct ltt_ust_session *lus = NULL;
-
- assert(session);
- assert(domain);
- assert(session->consumer);
-
- switch (domain->type) {
- case LTTNG_DOMAIN_UST:
- break;
- default:
- ERR("Unknown UST domain on create session %d", domain->type);
- ret = LTTCOMM_UNKNOWN_DOMAIN;
- goto error;
- }
-
- DBG("Creating UST session");
-
- lus = trace_ust_create_session(session->path, session->id, domain);
- if (lus == NULL) {
- ret = LTTCOMM_UST_SESS_FAIL;
- goto error;
- }
-
- lus->uid = session->uid;
- lus->gid = session->gid;
- session->ust_session = lus;
-
- /* Copy session output to the newly created UST session */
- ret = copy_session_consumer(domain->type, session);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- return LTTCOMM_OK;
-
-error:
- free(lus);
- session->ust_session = NULL;
- return ret;
-}
-
-/*
- * Create a kernel tracer session then create the default channel.
- */
-static int create_kernel_session(struct ltt_session *session)
-{
- int ret;
-
- DBG("Creating kernel session");
-
- ret = kernel_create_session(session, kernel_tracer_fd);
- if (ret < 0) {
- ret = LTTCOMM_KERN_SESS_FAIL;
- goto error;
- }
-
- /* Code flow safety */
- assert(session->kernel_session);
-
- /* Copy session output to the newly created Kernel session */
- ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- /* Create directory(ies) on local filesystem. */
- if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL &&
- strlen(session->kernel_session->consumer->dst.trace_path) > 0) {
- ret = run_as_mkdir_recursive(
- session->kernel_session->consumer->dst.trace_path,
- S_IRWXU | S_IRWXG, session->uid, session->gid);
- if (ret < 0) {
- if (ret != -EEXIST) {
- ERR("Trace directory creation error");
- goto error;
- }
- }
- }
-
- session->kernel_session->uid = session->uid;
- session->kernel_session->gid = session->gid;
-
- return LTTCOMM_OK;
-
-error:
- trace_kernel_destroy_session(session->kernel_session);
- session->kernel_session = NULL;
- return ret;
-}
-
-/*
- * Check if the UID or GID match the session. Root user has access to all
- * sessions.
- */
-static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
-{
- if (uid != session->uid && gid != session->gid && uid != 0) {
- return 0;
- } else {
- return 1;
- }
-}
-
-/*
- * Count number of session permitted by uid/gid.
- */
-static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
-{
- unsigned int i = 0;
- struct ltt_session *session;
-
- DBG("Counting number of available session for UID %d GID %d",
- uid, gid);
- cds_list_for_each_entry(session, &session_list_ptr->head, list) {
- /*
- * Only list the sessions the user can control.
- */
- if (!session_access_ok(session, uid, gid)) {
- continue;
- }
- i++;
- }
- return i;
-}
-
-/*
- * Create a session path used by list_lttng_sessions for the case that the
- * session consumer is on the network.
- */
-static int build_network_session_path(char *dst, size_t size,
- struct ltt_session *session)
-{
- int ret, kdata_port, udata_port;
- struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
- char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
-
- assert(session);
- assert(dst);
-
- memset(tmp_urls, 0, sizeof(tmp_urls));
- memset(tmp_uurl, 0, sizeof(tmp_uurl));
-
- kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
-
- if (session->kernel_session && session->kernel_session->consumer) {
- kuri = &session->kernel_session->consumer->dst.net.control;
- kdata_port = session->kernel_session->consumer->dst.net.data.port;
- }
-
- if (session->ust_session && session->ust_session->consumer) {
- uuri = &session->ust_session->consumer->dst.net.control;
- udata_port = session->ust_session->consumer->dst.net.data.port;
- }
-
- if (uuri == NULL && kuri == NULL) {
- uri = &session->consumer->dst.net.control;
- kdata_port = session->consumer->dst.net.data.port;
- } else if (kuri && uuri) {
- ret = uri_compare(kuri, uuri);
- if (ret) {
- /* Not Equal */
- uri = kuri;
- /* Build uuri URL string */
- ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
- if (ret < 0) {
- goto error;
- }
- } else {
- uri = kuri;
- }
- } else if (kuri && uuri == NULL) {
- uri = kuri;
- } else if (uuri && kuri == NULL) {
- uri = uuri;
- }
-
- ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
- if (ret < 0) {
- goto error;
- }
-
- if (strlen(tmp_uurl) > 0) {
- ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
- tmp_urls, kdata_port, tmp_uurl, udata_port);
- } else {
- ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, kdata_port);
- }
-
-error:
- return ret;
-}
-
-/*
- * Using the session list, filled a lttng_session array to send back to the
- * client for session listing.
- *
- * The session list lock MUST be acquired before calling this function. Use
- * session_lock_list() and session_unlock_list().
- */
-static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
- gid_t gid)
-{
- int ret;
- unsigned int i = 0;
- struct ltt_session *session;
-
- DBG("Getting all available session for UID %d GID %d",
- uid, gid);
- /*
- * Iterate over session list and append data after the control struct in
- * the buffer.
- */
- cds_list_for_each_entry(session, &session_list_ptr->head, list) {
- /*
- * Only list the sessions the user can control.
- */
- if (!session_access_ok(session, uid, gid)) {
- continue;
- }
-
- struct ltt_kernel_session *ksess = session->kernel_session;
- struct ltt_ust_session *usess = session->ust_session;
-
- if (session->consumer->type == CONSUMER_DST_NET ||
- (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
- (usess && usess->consumer->type == CONSUMER_DST_NET)) {
- ret = build_network_session_path(sessions[i].path,
- sizeof(session[i].path), session);
- } else {
- ret = snprintf(sessions[i].path, sizeof(session[i].path), "%s",
- session->consumer->dst.trace_path);
- }
- if (ret < 0) {
- PERROR("snprintf session path");
- continue;
- }
-
- strncpy(sessions[i].name, session->name, NAME_MAX);
- sessions[i].name[NAME_MAX - 1] = '\0';
- sessions[i].enabled = session->enabled;
- i++;
- }
-}
-
-/*
- * Fill lttng_channel array of all channels.
- */
-static void list_lttng_channels(int domain, struct ltt_session *session,
- struct lttng_channel *channels)
-{
- int i = 0;
- struct ltt_kernel_channel *kchan;
-
- DBG("Listing channels for session %s", session->name);
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- /* Kernel channels */
- if (session->kernel_session != NULL) {
- cds_list_for_each_entry(kchan,
- &session->kernel_session->channel_list.head, list) {
- /* Copy lttng_channel struct to array */
- memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
- channels[i].enabled = kchan->enabled;
- i++;
- }
- }
- break;
- case LTTNG_DOMAIN_UST:
- {
- struct lttng_ht_iter iter;
- struct ltt_ust_channel *uchan;
-
- cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
- &iter.iter, uchan, node.node) {
- strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
- channels[i].attr.overwrite = uchan->attr.overwrite;
- channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
- channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
- channels[i].attr.switch_timer_interval =
- uchan->attr.switch_timer_interval;
- channels[i].attr.read_timer_interval =
- uchan->attr.read_timer_interval;
- channels[i].enabled = uchan->enabled;
- switch (uchan->attr.output) {
- case LTTNG_UST_MMAP:
- default:
- channels[i].attr.output = LTTNG_EVENT_MMAP;
- break;
- }
- i++;
- }
- break;
- }
- default:
- break;
- }
-}
-
-/*
- * Create a list of ust global domain events.
- */
-static int list_lttng_ust_global_events(char *channel_name,
- struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
-{
- int i = 0, ret = 0;
- unsigned int nb_event = 0;
- struct lttng_ht_iter iter;
- struct lttng_ht_node_str *node;
- struct ltt_ust_channel *uchan;
- struct ltt_ust_event *uevent;
- struct lttng_event *tmp;
-
- DBG("Listing UST global events for channel %s", channel_name);
-
- rcu_read_lock();
-
- lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
- node = lttng_ht_iter_get_node_str(&iter);
- if (node == NULL) {
- ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
- goto error;
- }
-
- uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
-
- nb_event += lttng_ht_get_count(uchan->events);
-
- if (nb_event == 0) {
- ret = nb_event;
- goto error;
- }
-
- DBG3("Listing UST global %d events", nb_event);
-
- tmp = zmalloc(nb_event * sizeof(struct lttng_event));
- if (tmp == NULL) {
- ret = -LTTCOMM_FATAL;
- goto error;
- }
-
- cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
- strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
- tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
- tmp[i].enabled = uevent->enabled;
- switch (uevent->attr.instrumentation) {
- case LTTNG_UST_TRACEPOINT:
- tmp[i].type = LTTNG_EVENT_TRACEPOINT;
- break;
- case LTTNG_UST_PROBE:
- tmp[i].type = LTTNG_EVENT_PROBE;
- break;
- case LTTNG_UST_FUNCTION:
- tmp[i].type = LTTNG_EVENT_FUNCTION;
- break;
- }
- tmp[i].loglevel = uevent->attr.loglevel;
- switch (uevent->attr.loglevel_type) {
- case LTTNG_UST_LOGLEVEL_ALL:
- tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
- break;
- case LTTNG_UST_LOGLEVEL_RANGE:
- tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
- break;
- case LTTNG_UST_LOGLEVEL_SINGLE:
- tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
- break;
- }
- if (uevent->filter) {
- tmp[i].filter = 1;
- }
- i++;
- }
-
- ret = nb_event;
- *events = tmp;
-
-error:
- rcu_read_unlock();
- return ret;
-}
-
-/*
- * Fill lttng_event array of all kernel events in the channel.
- */
-static int list_lttng_kernel_events(char *channel_name,
- struct ltt_kernel_session *kernel_session, struct lttng_event **events)
-{
- int i = 0, ret;
- unsigned int nb_event;
- struct ltt_kernel_event *event;
- struct ltt_kernel_channel *kchan;
-
- kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
- if (kchan == NULL) {
- ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
- goto error;
- }
-
- nb_event = kchan->event_count;
-
- DBG("Listing events for channel %s", kchan->channel->name);
-
- if (nb_event == 0) {
- ret = nb_event;
- goto error;
- }
-
- *events = zmalloc(nb_event * sizeof(struct lttng_event));
- if (*events == NULL) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
-
- /* Kernel channels */
- cds_list_for_each_entry(event, &kchan->events_list.head , list) {
- strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
- (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
- (*events)[i].enabled = event->enabled;
- switch (event->event->instrumentation) {
- case LTTNG_KERNEL_TRACEPOINT:
- (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
- break;
- case LTTNG_KERNEL_KPROBE:
- case LTTNG_KERNEL_KRETPROBE:
- (*events)[i].type = LTTNG_EVENT_PROBE;
- memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
- sizeof(struct lttng_kernel_kprobe));
- break;
- case LTTNG_KERNEL_FUNCTION:
- (*events)[i].type = LTTNG_EVENT_FUNCTION;
- memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
- sizeof(struct lttng_kernel_function));
- break;
- case LTTNG_KERNEL_NOOP:
- (*events)[i].type = LTTNG_EVENT_NOOP;
- break;
- case LTTNG_KERNEL_SYSCALL:
- (*events)[i].type = LTTNG_EVENT_SYSCALL;
- break;
- case LTTNG_KERNEL_ALL:
- assert(0);
- break;
- }
- i++;
- }
-
- return nb_event;
-
-error:
- return ret;
-}
-
-
-/*
- * Add URI so the consumer output object. Set the correct path depending on the
- * domain adding the default trace directory.
- */
-static int add_uri_to_consumer(struct consumer_output *consumer,
- struct lttng_uri *uri, int domain, const char *session_name)
-{
- int ret = LTTCOMM_OK;
- const char *default_trace_dir;
-
- assert(uri);
-
- if (consumer == NULL) {
- DBG("No consumer detected. Don't add URI. Stopping.");
- ret = LTTCOMM_NO_CONSUMER;
- goto error;
- }
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
- break;
- case LTTNG_DOMAIN_UST:
- default_trace_dir = DEFAULT_UST_TRACE_DIR;
- break;
- default:
- /*
- * This case is possible is we try to add the URI to the global tracing
- * session consumer object which in this case there is no subdir.
- */
- default_trace_dir = "";
- }
-
- switch (uri->dtype) {
- case LTTNG_DST_IPV4:
- case LTTNG_DST_IPV6:
- DBG2("Setting network URI to consumer");
-
- /* Set URI into consumer output object */
- ret = consumer_set_network_uri(consumer, uri);
- if (ret < 0) {
- ret = LTTCOMM_FATAL;
- goto error;
- } else if (ret == 1) {
- /*
- * URI was the same in the consumer so we do not append the subdir
- * again so to not duplicate output dir.
- */
- goto error;
- }
-
- if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
- ret = set_consumer_subdir(consumer, session_name);
- if (ret < 0) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
- }
-
- if (uri->stype == LTTNG_STREAM_CONTROL) {
- /* On a new subdir, reappend the default trace dir. */
- strncat(consumer->subdir, default_trace_dir, sizeof(consumer->subdir));
- DBG3("Append domain trace name to subdir %s", consumer->subdir);
- }
-
- break;
- case LTTNG_DST_PATH:
- DBG2("Setting trace directory path from URI to %s", uri->dst.path);
- memset(consumer->dst.trace_path, 0,
- sizeof(consumer->dst.trace_path));
- strncpy(consumer->dst.trace_path, uri->dst.path,
- sizeof(consumer->dst.trace_path));
- /* Append default trace dir */
- strncat(consumer->dst.trace_path, default_trace_dir,
- sizeof(consumer->dst.trace_path));
- /* Flag consumer as local. */
- consumer->type = CONSUMER_DST_LOCAL;
- break;
- }
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
- */
-static int cmd_disable_channel(struct ltt_session *session,
- int domain, char *channel_name)
-{
- int ret;
- struct ltt_ust_session *usess;
-
- usess = session->ust_session;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- ret = channel_kernel_disable(session->kernel_session,
- channel_name);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- break;
- }
- case LTTNG_DOMAIN_UST:
- {
- struct ltt_ust_channel *uchan;
- struct lttng_ht *chan_ht;
-
- chan_ht = usess->domain_global.channels;
-
- uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
- if (uchan == NULL) {
- ret = LTTCOMM_UST_CHAN_NOT_FOUND;
- goto error;
- }
-
- ret = channel_ust_disable(usess, domain, uchan);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
-#endif
- default:
- ret = LTTCOMM_UNKNOWN_DOMAIN;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
- */
-static int cmd_enable_channel(struct ltt_session *session,
- int domain, struct lttng_channel *attr)
-{
- int ret;
- struct ltt_ust_session *usess = session->ust_session;
- struct lttng_ht *chan_ht;
-
- DBG("Enabling channel %s for session %s", attr->name, session->name);
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- struct ltt_kernel_channel *kchan;
-
- kchan = trace_kernel_get_channel_by_name(attr->name,
- session->kernel_session);
- if (kchan == NULL) {
- ret = channel_kernel_create(session->kernel_session,
- attr, kernel_poll_pipe[1]);
- } else {
- ret = channel_kernel_enable(session->kernel_session, kchan);
- }
-
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- break;
- }
- case LTTNG_DOMAIN_UST:
- {
- struct ltt_ust_channel *uchan;
-
- chan_ht = usess->domain_global.channels;
-
- uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
- if (uchan == NULL) {
- ret = channel_ust_create(usess, domain, attr);
- } else {
- ret = channel_ust_enable(usess, domain, uchan);
- }
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
-#endif
- default:
- ret = LTTCOMM_UNKNOWN_DOMAIN;
- goto error;
- }
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_DISABLE_EVENT processed by the client thread.
- */
-static int cmd_disable_event(struct ltt_session *session, int domain,
- char *channel_name, char *event_name)
-{
- int ret;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- struct ltt_kernel_channel *kchan;
- struct ltt_kernel_session *ksess;
-
- ksess = session->kernel_session;
-
- kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
- if (kchan == NULL) {
- ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
- goto error;
- }
-
- ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- break;
- }
- case LTTNG_DOMAIN_UST:
- {
- struct ltt_ust_channel *uchan;
- struct ltt_ust_session *usess;
-
- usess = session->ust_session;
-
- uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
- channel_name);
- if (uchan == NULL) {
- ret = LTTCOMM_UST_CHAN_NOT_FOUND;
- goto error;
- }
-
- ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- DBG3("Disable UST event %s in channel %s completed", event_name,
- channel_name);
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
-#endif
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
- */
-static int cmd_disable_event_all(struct ltt_session *session, int domain,
- char *channel_name)
-{
- int ret;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- struct ltt_kernel_session *ksess;
- struct ltt_kernel_channel *kchan;
-
- ksess = session->kernel_session;
-
- kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
- if (kchan == NULL) {
- ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
- goto error;
- }
-
- ret = event_kernel_disable_all(ksess, kchan);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- break;
- }
- case LTTNG_DOMAIN_UST:
- {
- struct ltt_ust_session *usess;
- struct ltt_ust_channel *uchan;
-
- usess = session->ust_session;
-
- uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
- channel_name);
- if (uchan == NULL) {
- ret = LTTCOMM_UST_CHAN_NOT_FOUND;
- goto error;
- }
-
- ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
- if (ret != 0) {
- goto error;
- }
-
- DBG3("Disable all UST events in channel %s completed", channel_name);
-
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
-#endif
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_ADD_CONTEXT processed by the client thread.
- */
-static int cmd_add_context(struct ltt_session *session, int domain,
- char *channel_name, char *event_name, struct lttng_event_context *ctx)
-{
- int ret;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- /* Add kernel context to kernel tracer */
- ret = context_kernel_add(session->kernel_session, ctx,
- event_name, channel_name);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
- break;
- case LTTNG_DOMAIN_UST:
- {
- struct ltt_ust_session *usess = session->ust_session;
-
- ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
-#endif
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_SET_FILTER processed by the client thread.
- */
-static int cmd_set_filter(struct ltt_session *session, int domain,
- char *channel_name, char *event_name,
- struct lttng_filter_bytecode *bytecode)
-{
- int ret;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- ret = LTTCOMM_FATAL;
- break;
- case LTTNG_DOMAIN_UST:
- {
- struct ltt_ust_session *usess = session->ust_session;
-
- ret = filter_ust_set(usess, domain, bytecode, event_name, channel_name);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
-#endif
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-
-}
-
-/*
- * Command LTTNG_ENABLE_EVENT processed by the client thread.
- */
-static int cmd_enable_event(struct ltt_session *session, int domain,
- char *channel_name, struct lttng_event *event)
-{
- int ret;
- struct lttng_channel *attr;
- struct ltt_ust_session *usess = session->ust_session;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- struct ltt_kernel_channel *kchan;
-
- kchan = trace_kernel_get_channel_by_name(channel_name,
- session->kernel_session);
- if (kchan == NULL) {
- attr = channel_new_default_attr(domain);
- if (attr == NULL) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
- snprintf(attr->name, NAME_MAX, "%s", channel_name);
-
- /* This call will notify the kernel thread */
- ret = channel_kernel_create(session->kernel_session,
- attr, kernel_poll_pipe[1]);
- if (ret != LTTCOMM_OK) {
- free(attr);
- goto error;
- }
- free(attr);
- }
-
- /* Get the newly created kernel channel pointer */
- kchan = trace_kernel_get_channel_by_name(channel_name,
- session->kernel_session);
- if (kchan == NULL) {
- /* This sould not happen... */
- ret = LTTCOMM_FATAL;
- goto error;
- }
-
- ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
- event);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- break;
- }
- case LTTNG_DOMAIN_UST:
- {
- struct lttng_channel *attr;
- struct ltt_ust_channel *uchan;
-
- /* Get channel from global UST domain */
- uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
- channel_name);
- if (uchan == NULL) {
- /* Create default channel */
- attr = channel_new_default_attr(domain);
- if (attr == NULL) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
- snprintf(attr->name, NAME_MAX, "%s", channel_name);
- attr->name[NAME_MAX - 1] = '\0';
-
- ret = channel_ust_create(usess, domain, attr);
- if (ret != LTTCOMM_OK) {
- free(attr);
- goto error;
- }
- free(attr);
-
- /* Get the newly created channel reference back */
- uchan = trace_ust_find_channel_by_name(
- usess->domain_global.channels, channel_name);
- if (uchan == NULL) {
- /* Something is really wrong */
- ret = LTTCOMM_FATAL;
- goto error;
- }
- }
-
- /* At this point, the session and channel exist on the tracer */
- ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
-#endif
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
- */
-static int cmd_enable_event_all(struct ltt_session *session, int domain,
- char *channel_name, int event_type)
-{
- int ret;
- struct ltt_kernel_channel *kchan;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- kchan = trace_kernel_get_channel_by_name(channel_name,
- session->kernel_session);
- if (kchan == NULL) {
- /* This call will notify the kernel thread */
- ret = channel_kernel_create(session->kernel_session, NULL,
- kernel_poll_pipe[1]);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- /* Get the newly created kernel channel pointer */
- kchan = trace_kernel_get_channel_by_name(channel_name,
- session->kernel_session);
- if (kchan == NULL) {
- /* This sould not happen... */
- ret = LTTCOMM_FATAL;
- goto error;
- }
-
- }
-
- switch (event_type) {
- case LTTNG_EVENT_SYSCALL:
- ret = event_kernel_enable_all_syscalls(session->kernel_session,
- kchan, kernel_tracer_fd);
- break;
- case LTTNG_EVENT_TRACEPOINT:
- /*
- * This call enables all LTTNG_KERNEL_TRACEPOINTS and
- * events already registered to the channel.
- */
- ret = event_kernel_enable_all_tracepoints(session->kernel_session,
- kchan, kernel_tracer_fd);
- break;
- case LTTNG_EVENT_ALL:
- /* Enable syscalls and tracepoints */
- ret = event_kernel_enable_all(session->kernel_session,
- kchan, kernel_tracer_fd);
- break;
- default:
- ret = LTTCOMM_KERN_ENABLE_FAIL;
- goto error;
- }
-
- /* Manage return value */
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- break;
- case LTTNG_DOMAIN_UST:
- {
- struct lttng_channel *attr;
- struct ltt_ust_channel *uchan;
- struct ltt_ust_session *usess = session->ust_session;
-
- /* Get channel from global UST domain */
- uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
- channel_name);
- if (uchan == NULL) {
- /* Create default channel */
- attr = channel_new_default_attr(domain);
- if (attr == NULL) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
- snprintf(attr->name, NAME_MAX, "%s", channel_name);
- attr->name[NAME_MAX - 1] = '\0';
-
- /* Use the internal command enable channel */
- ret = channel_ust_create(usess, domain, attr);
- if (ret != LTTCOMM_OK) {
- free(attr);
- goto error;
- }
- free(attr);
-
- /* Get the newly created channel reference back */
- uchan = trace_ust_find_channel_by_name(
- usess->domain_global.channels, channel_name);
- if (uchan == NULL) {
- /* Something is really wrong */
- ret = LTTCOMM_FATAL;
- goto error;
- }
- }
-
- /* At this point, the session and channel exist on the tracer */
-
- switch (event_type) {
- case LTTNG_EVENT_ALL:
- case LTTNG_EVENT_TRACEPOINT:
- ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
- break;
- default:
- ret = LTTCOMM_UST_ENABLE_FAIL;
- goto error;
- }
-
- /* Manage return value */
- if (ret != LTTCOMM_OK) {
- goto error;
- }
-
- break;
- }
-#if 0
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
-#endif
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
- */
-static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
-{
- int ret;
- ssize_t nb_events = 0;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- nb_events = kernel_list_events(kernel_tracer_fd, events);
- if (nb_events < 0) {
- ret = LTTCOMM_KERN_LIST_FAIL;
- goto error;
- }
- break;
- case LTTNG_DOMAIN_UST:
- nb_events = ust_app_list_events(events);
- if (nb_events < 0) {
- ret = LTTCOMM_UST_LIST_FAIL;
- goto error;
- }
- break;
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- return nb_events;
-
-error:
- /* Return negative value to differentiate return code */
- return -ret;
-}
-
-/*
- * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
- */
-static ssize_t cmd_list_tracepoint_fields(int domain,
- struct lttng_event_field **fields)
-{
- int ret;
- ssize_t nb_fields = 0;
-
- switch (domain) {
- case LTTNG_DOMAIN_UST:
- nb_fields = ust_app_list_event_fields(fields);
- if (nb_fields < 0) {
- ret = LTTCOMM_UST_LIST_FAIL;
- goto error;
- }
- break;
- case LTTNG_DOMAIN_KERNEL:
- default: /* fall-through */
- ret = LTTCOMM_UND;
- goto error;
- }
-
- return nb_fields;
-
-error:
- /* Return negative value to differentiate return code */
- return -ret;
-}
-
-/*
- * Command LTTNG_START_TRACE processed by the client thread.
- */
-static int cmd_start_trace(struct ltt_session *session)
-{
- int ret;
- struct ltt_kernel_session *ksession;
- struct ltt_ust_session *usess;
- struct ltt_kernel_channel *kchan;
-
- /* Ease our life a bit ;) */
- ksession = session->kernel_session;
- usess = session->ust_session;
-
- if (session->enabled) {
- /* Already started. */
- ret = LTTCOMM_TRACE_ALREADY_STARTED;
- goto error;
- }
-
- session->enabled = 1;
-
- ret = setup_relayd(session);
- if (ret != LTTCOMM_OK) {
- ERR("Error setting up relayd for session %s", session->name);
- goto error;
- }
-
- /* Kernel tracing */
- if (ksession != NULL) {
- /* Open kernel metadata */
- if (ksession->metadata == NULL) {
- ret = kernel_open_metadata(ksession);
- if (ret < 0) {
- ret = LTTCOMM_KERN_META_FAIL;
- goto error;
- }
- }
-
- /* Open kernel metadata stream */
- if (ksession->metadata_stream_fd < 0) {
- ret = kernel_open_metadata_stream(ksession);
- if (ret < 0) {
- ERR("Kernel create metadata stream failed");
- ret = LTTCOMM_KERN_STREAM_FAIL;
- goto error;
- }
- }
-
- /* For each channel */
- cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
- if (kchan->stream_count == 0) {
- ret = kernel_open_channel_stream(kchan);
- if (ret < 0) {
- ret = LTTCOMM_KERN_STREAM_FAIL;
- goto error;
- }
- /* Update the stream global counter */
- ksession->stream_count_global += ret;
- }
- }
-
- /* Setup kernel consumer socket and send fds to it */
- ret = init_kernel_tracing(ksession);
- if (ret < 0) {
- ret = LTTCOMM_KERN_START_FAIL;
- goto error;
- }
-
- /* This start the kernel tracing */
- ret = kernel_start_session(ksession);
- if (ret < 0) {
- ret = LTTCOMM_KERN_START_FAIL;
- goto error;
- }
-
- /* Quiescent wait after starting trace */
- kernel_wait_quiescent(kernel_tracer_fd);
- }
-
- /* Flag session that trace should start automatically */
- if (usess) {
- usess->start_trace = 1;
-
- ret = ust_app_start_trace_all(usess);
- if (ret < 0) {
- ret = LTTCOMM_UST_START_FAIL;
- goto error;
- }
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_STOP_TRACE processed by the client thread.
- */
-static int cmd_stop_trace(struct ltt_session *session)
-{
- int ret;
- struct ltt_kernel_channel *kchan;
- struct ltt_kernel_session *ksession;
- struct ltt_ust_session *usess;
-
- /* Short cut */
- ksession = session->kernel_session;
- usess = session->ust_session;
-
- if (!session->enabled) {
- ret = LTTCOMM_TRACE_ALREADY_STOPPED;
- goto error;
- }
-
- session->enabled = 0;
-
- /* Kernel tracer */
- if (ksession != NULL) {
- DBG("Stop kernel tracing");
-
- /* Flush metadata if exist */
- if (ksession->metadata_stream_fd >= 0) {
- ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
- if (ret < 0) {
- ERR("Kernel metadata flush failed");
- }
- }
-
- /* Flush all buffers before stopping */
- cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
- ret = kernel_flush_buffer(kchan);
- if (ret < 0) {
- ERR("Kernel flush buffer error");
- }
- }
-
- ret = kernel_stop_session(ksession);
- if (ret < 0) {
- ret = LTTCOMM_KERN_STOP_FAIL;
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- }
-
- if (usess) {
- usess->start_trace = 0;
-
- ret = ust_app_stop_trace_all(usess);
- if (ret < 0) {
- ret = LTTCOMM_UST_STOP_FAIL;
- goto error;
- }
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
- */
-static int cmd_set_consumer_uri(int domain, struct ltt_session *session,
- size_t nb_uri, struct lttng_uri *uris)
-{
- int ret, i;
- struct ltt_kernel_session *ksess = session->kernel_session;
- struct ltt_ust_session *usess = session->ust_session;
- struct consumer_output *consumer = NULL;
-
- assert(session);
- assert(uris);
- assert(nb_uri > 0);
-
- /* Can't enable consumer after session started. */
- if (session->enabled) {
- ret = LTTCOMM_TRACE_ALREADY_STARTED;
- goto error;
- }
-
- if (!session->start_consumer) {
- ret = LTTCOMM_NO_CONSUMER;
- goto error;
- }
-
- /*
- * This case switch makes sure the domain session has a temporary consumer
- * so the URL can be set.
- */
- switch (domain) {
- case 0:
- /* Code flow error. A session MUST always have a consumer object */
- assert(session->consumer);
- /*
- * The URL will be added to the tracing session consumer instead of a
- * specific domain consumer.
- */
- consumer = session->consumer;
- break;
- case LTTNG_DOMAIN_KERNEL:
- /* Code flow error if we don't have a kernel session here. */
- assert(ksess);
-
- /* Create consumer output if none exists */
- consumer = ksess->tmp_consumer;
- if (consumer == NULL) {
- consumer = consumer_copy_output(ksess->consumer);
- if (consumer == NULL) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
- /* Trash the consumer subdir, we are about to set a new one. */
- memset(consumer->subdir, 0, sizeof(consumer->subdir));
- ksess->tmp_consumer = consumer;
- }
-
- break;
- case LTTNG_DOMAIN_UST:
- /* Code flow error if we don't have a kernel session here. */
- assert(usess);
-
- /* Create consumer output if none exists */
- consumer = usess->tmp_consumer;
- if (consumer == NULL) {
- consumer = consumer_copy_output(usess->consumer);
- if (consumer == NULL) {
- ret = LTTCOMM_FATAL;
- goto error;
- }
- /* Trash the consumer subdir, we are about to set a new one. */
- memset(consumer->subdir, 0, sizeof(consumer->subdir));
- usess->tmp_consumer = consumer;
- }
-
- break;
- }
-
- for (i = 0; i < nb_uri; i++) {
- struct consumer_socket *socket;
- struct lttng_ht_iter iter;
-
- ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
- if (ret < 0) {
- goto error;
- }
-
- /*
- * Don't send relayd socket if URI is NOT remote or if the relayd
- * sockets for the session are already sent.
- */
- if (uris[i].dtype == LTTNG_DST_PATH ||
- consumer->dst.net.relayd_socks_sent) {
- continue;
- }
-
- /* Try to send relayd URI to the consumer if exist. */
- cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter,
- socket, node.node) {
-
- /* A socket in the HT should never have a negative fd */
- assert(socket->fd >= 0);
-
- pthread_mutex_lock(socket->lock);
- ret = send_socket_relayd_consumer(domain, session, &uris[i],
- consumer, socket->fd);
- pthread_mutex_unlock(socket->lock);
- if (ret != LTTCOMM_OK) {
- goto error;
- }
- }
- }
-
- /* All good! */
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-
-/*
- * Command LTTNG_CREATE_SESSION processed by the client thread.
- */
-static int cmd_create_session_uri(char *name, struct lttng_uri *uris,
- size_t nb_uri, lttng_sock_cred *creds)
-{
- int ret;
- char *path = NULL;
- struct ltt_session *session;
-
- assert(name);
-
- /*
- * Verify if the session already exist
- *
- * XXX: There is no need for the session lock list here since the caller
- * (process_client_msg) is holding it. We might want to change that so a
- * single command does not lock the entire session list.
- */
- session = session_find_by_name(name);
- if (session != NULL) {
- ret = LTTCOMM_EXIST_SESS;
- goto find_error;
- }
-
- /* Create tracing session in the registry */
- ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds),
- LTTNG_SOCK_GET_GID_CRED(creds));
- if (ret != LTTCOMM_OK) {
- goto session_error;
- }
-
- /*
- * Get the newly created session pointer back
- *
- * XXX: There is no need for the session lock list here since the caller
- * (process_client_msg) is holding it. We might want to change that so a
- * single command does not lock the entire session list.
- */
- session = session_find_by_name(name);
- assert(session);
-
- /* Create default consumer output for the session not yet created. */
- session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
- if (session->consumer == NULL) {
- ret = LTTCOMM_FATAL;
- goto consumer_error;
- }
-
- /*
- * This means that the lttng_create_session call was called with the _path_
- * argument set to NULL.
- */
- if (uris == NULL) {
- /*
- * At this point, we'll skip the consumer URI setup and create a
- * session with a NULL path which will flag the session to NOT spawn a
- * consumer.
- */
- DBG("Create session %s with NO uri, skipping consumer setup", name);
- goto end;
- }
-
- session->start_consumer = 1;
-
- ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
- if (ret != LTTCOMM_OK) {
- goto consumer_error;
- }
-
- session->consumer->enabled = 1;
-
-end:
- return LTTCOMM_OK;
-
-consumer_error:
- session_destroy(session);
-session_error:
-find_error:
- return ret;
-}
-
-/*
- * Command LTTNG_DESTROY_SESSION processed by the client thread.
- */
-static int cmd_destroy_session(struct ltt_session *session, char *name)
-{
- int ret;
-
- /* Safety net */
- assert(session);
-
- /* Clean kernel session teardown */
- teardown_kernel_session(session);
- /* UST session teardown */
- teardown_ust_session(session);
-
- /*
- * Must notify the kernel thread here to update it's poll setin order
- * to remove the channel(s)' fd just destroyed.
- */
- ret = notify_thread_pipe(kernel_poll_pipe[1]);
- if (ret < 0) {
- PERROR("write kernel poll pipe");
- }
-
- ret = session_destroy(session);
-
- return ret;
-}
-
-/*
- * Command LTTNG_CALIBRATE processed by the client thread.
- */
-static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
-{
- int ret;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- struct lttng_kernel_calibrate kcalibrate;
-
- kcalibrate.type = calibrate->type;
- ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
- if (ret < 0) {
- ret = LTTCOMM_KERN_ENABLE_FAIL;
- goto error;
- }
- break;
- }
- case LTTNG_DOMAIN_UST:
- {
- struct lttng_ust_calibrate ucalibrate;
-
- ucalibrate.type = calibrate->type;
- ret = ust_app_calibrate_glb(&ucalibrate);
- if (ret < 0) {
- ret = LTTCOMM_UST_CALIBRATE_FAIL;
- goto error;
- }
- break;
- }
- default:
- ret = LTTCOMM_UND;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
- */
-static int cmd_register_consumer(struct ltt_session *session, int domain,
- char *sock_path)
-{
- int ret, sock;
- struct consumer_socket *socket;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- /* Can't register a consumer if there is already one */
- if (session->kernel_session->consumer_fds_sent != 0) {
- ret = LTTCOMM_KERN_CONSUMER_FAIL;
- goto error;
- }
-
- sock = lttcomm_connect_unix_sock(sock_path);
- if (sock < 0) {
- ret = LTTCOMM_CONNECT_FAIL;
- goto error;
- }
-
- socket = consumer_allocate_socket(sock);
- if (socket == NULL) {
- ret = LTTCOMM_FATAL;
- close(sock);
- goto error;
- }
-
- socket->lock = zmalloc(sizeof(pthread_mutex_t));
- if (socket->lock == NULL) {
- PERROR("zmalloc pthread mutex");
- ret = LTTCOMM_FATAL;
- goto error;
- }
- pthread_mutex_init(socket->lock, NULL);
-
- rcu_read_lock();
- consumer_add_socket(socket, session->kernel_session->consumer);
- rcu_read_unlock();
-
- pthread_mutex_lock(&kconsumer_data.pid_mutex);
- kconsumer_data.pid = -1;
- pthread_mutex_unlock(&kconsumer_data.pid_mutex);
-
- break;
- default:
- /* TODO: Userspace tracing */
- ret = LTTCOMM_UND;
- goto error;
- }
-
- ret = LTTCOMM_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_LIST_DOMAINS processed by the client thread.
- */
-static ssize_t cmd_list_domains(struct ltt_session *session,
- struct lttng_domain **domains)
-{
- int ret, index = 0;
- ssize_t nb_dom = 0;
-
- if (session->kernel_session != NULL) {
- DBG3("Listing domains found kernel domain");
- nb_dom++;
+ ret = -1;
+ goto error_open;
}
- if (session->ust_session != NULL) {
- DBG3("Listing domains found UST global domain");
- nb_dom++;
+ /* Validate kernel version */
+ ret = kernel_validate_version(kernel_tracer_fd);
+ if (ret < 0) {
+ goto error_version;
}
- *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
- if (*domains == NULL) {
- ret = -LTTCOMM_FATAL;
- goto error;
+ ret = modprobe_lttng_data();
+ if (ret < 0) {
+ goto error_modules;
}
- if (session->kernel_session != NULL) {
- (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
- index++;
+ DBG("Kernel tracer fd %d", kernel_tracer_fd);
+ return 0;
+
+error_version:
+ modprobe_remove_lttng_control();
+ ret = close(kernel_tracer_fd);
+ if (ret) {
+ PERROR("close");
}
+ kernel_tracer_fd = -1;
+ return LTTCOMM_KERN_VERSION;
- if (session->ust_session != NULL) {
- (*domains)[index].type = LTTNG_DOMAIN_UST;
- index++;
+error_modules:
+ ret = close(kernel_tracer_fd);
+ if (ret) {
+ PERROR("close");
}
- return nb_dom;
+error_open:
+ modprobe_remove_lttng_control();
error:
- return ret;
+ WARN("No kernel tracer available");
+ kernel_tracer_fd = -1;
+ if (!is_root) {
+ return LTTCOMM_NEED_ROOT_SESSIOND;
+ } else {
+ return LTTCOMM_KERN_NA;
+ }
}
+
/*
- * Command LTTNG_LIST_CHANNELS processed by the client thread.
+ * Copy consumer output from the tracing session to the domain session. The
+ * function also applies the right modification on a per domain basis for the
+ * trace files destination directory.
*/
-static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
- struct lttng_channel **channels)
+static int copy_session_consumer(int domain, struct ltt_session *session)
{
int ret;
- ssize_t nb_chan = 0;
+ const char *dir_name;
+ struct consumer_output *consumer;
+
+ assert(session);
+ assert(session->consumer);
switch (domain) {
case LTTNG_DOMAIN_KERNEL:
- if (session->kernel_session != NULL) {
- nb_chan = session->kernel_session->channel_count;
- }
- DBG3("Number of kernel channels %zd", nb_chan);
+ DBG3("Copying tracing session consumer output in kernel session");
+ session->kernel_session->consumer =
+ consumer_copy_output(session->consumer);
+ /* Ease our life a bit for the next part */
+ consumer = session->kernel_session->consumer;
+ dir_name = DEFAULT_KERNEL_TRACE_DIR;
break;
case LTTNG_DOMAIN_UST:
- if (session->ust_session != NULL) {
- nb_chan = lttng_ht_get_count(
- session->ust_session->domain_global.channels);
- }
- DBG3("Number of UST global channels %zd", nb_chan);
+ DBG3("Copying tracing session consumer output in UST session");
+ session->ust_session->consumer =
+ consumer_copy_output(session->consumer);
+ /* Ease our life a bit for the next part */
+ consumer = session->ust_session->consumer;
+ dir_name = DEFAULT_UST_TRACE_DIR;
break;
default:
- *channels = NULL;
- ret = -LTTCOMM_UND;
+ ret = LTTCOMM_UNKNOWN_DOMAIN;
goto error;
}
- if (nb_chan > 0) {
- *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
- if (*channels == NULL) {
- ret = -LTTCOMM_FATAL;
- goto error;
- }
-
- list_lttng_channels(domain, session, *channels);
- } else {
- *channels = NULL;
- }
-
- return nb_chan;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_LIST_EVENTS processed by the client thread.
- */
-static ssize_t cmd_list_events(int domain, struct ltt_session *session,
- char *channel_name, struct lttng_event **events)
-{
- int ret = 0;
- ssize_t nb_event = 0;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- if (session->kernel_session != NULL) {
- nb_event = list_lttng_kernel_events(channel_name,
- session->kernel_session, events);
- }
- break;
- case LTTNG_DOMAIN_UST:
- {
- if (session->ust_session != NULL) {
- nb_event = list_lttng_ust_global_events(channel_name,
- &session->ust_session->domain_global, events);
- }
- break;
- }
- default:
- ret = -LTTCOMM_UND;
+ ret = consumer_set_subdir(session->consumer, session->name);
+ if (ret < 0) {
+ ret = LTTCOMM_FATAL;
goto error;
}
- ret = nb_event;
+ /* Append correct directory to subdir */
+ strncat(consumer->subdir, dir_name, sizeof(consumer->subdir));
+ DBG3("Copy session consumer subdir %s", consumer->subdir);
+
+ ret = LTTCOMM_OK;
error:
return ret;
}
/*
- * Command LTTNG_DISABLE_CONSUMER processed by the client thread.
+ * Create an UST session and add it to the session ust list.
*/
-static int cmd_disable_consumer(int domain, struct ltt_session *session)
+static int create_ust_session(struct ltt_session *session,
+ struct lttng_domain *domain)
{
int ret;
- struct ltt_kernel_session *ksess = session->kernel_session;
- struct ltt_ust_session *usess = session->ust_session;
- struct consumer_output *consumer;
+ struct ltt_ust_session *lus = NULL;
assert(session);
+ assert(domain);
+ assert(session->consumer);
- if (session->enabled) {
- /* Can't disable consumer on an already started session */
- ret = LTTCOMM_TRACE_ALREADY_STARTED;
+ switch (domain->type) {
+ case LTTNG_DOMAIN_UST:
+ break;
+ default:
+ ERR("Unknown UST domain on create session %d", domain->type);
+ ret = LTTCOMM_UNKNOWN_DOMAIN;
goto error;
}
- if (!session->start_consumer) {
- ret = LTTCOMM_NO_CONSUMER;
+ DBG("Creating UST session");
+
+ lus = trace_ust_create_session(session->path, session->id, domain);
+ if (lus == NULL) {
+ ret = LTTCOMM_UST_SESS_FAIL;
goto error;
}
- switch (domain) {
- case 0:
- DBG("Disable tracing session %s consumer", session->name);
- consumer = session->consumer;
- break;
- case LTTNG_DOMAIN_KERNEL:
- /* Code flow error if we don't have a kernel session here. */
- assert(ksess);
-
- DBG("Disabling kernel consumer");
- consumer = ksess->consumer;
-
- break;
- case LTTNG_DOMAIN_UST:
- /* Code flow error if we don't have a UST session here. */
- assert(usess);
-
- DBG("Disabling UST consumer");
- consumer = usess->consumer;
+ lus->uid = session->uid;
+ lus->gid = session->gid;
+ session->ust_session = lus;
- break;
- default:
- ret = LTTCOMM_UNKNOWN_DOMAIN;
+ /* Copy session output to the newly created UST session */
+ ret = copy_session_consumer(domain->type, session);
+ if (ret != LTTCOMM_OK) {
goto error;
}
- if (consumer) {
- consumer->enabled = 0;
- /* Success at this point */
- ret = LTTCOMM_OK;
- } else {
- ret = LTTCOMM_NO_CONSUMER;
- }
+ return LTTCOMM_OK;
error:
+ free(lus);
+ session->ust_session = NULL;
return ret;
}
/*
- * Command LTTNG_ENABLE_CONSUMER processed by the client thread.
+ * Create a kernel tracer session then create the default channel.
*/
-static int cmd_enable_consumer(int domain, struct ltt_session *session)
+static int create_kernel_session(struct ltt_session *session)
{
int ret;
- struct ltt_kernel_session *ksess = session->kernel_session;
- struct ltt_ust_session *usess = session->ust_session;
- struct consumer_output *consumer = NULL;
- assert(session);
+ DBG("Creating kernel session");
- /* Can't enable consumer after session started. */
- if (session->enabled) {
- ret = LTTCOMM_TRACE_ALREADY_STARTED;
+ ret = kernel_create_session(session, kernel_tracer_fd);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_SESS_FAIL;
goto error;
}
- if (!session->start_consumer) {
- ret = LTTCOMM_NO_CONSUMER;
+ /* Code flow safety */
+ assert(session->kernel_session);
+
+ /* Copy session output to the newly created Kernel session */
+ ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session);
+ if (ret != LTTCOMM_OK) {
goto error;
}
- switch (domain) {
- case 0:
- assert(session->consumer);
- consumer = session->consumer;
- break;
- case LTTNG_DOMAIN_KERNEL:
- /* Code flow error if we don't have a kernel session here. */
- assert(ksess);
-
- /*
- * Check if we have already sent fds to the consumer. In that case,
- * the enable-consumer command can't be used because a start trace
- * had previously occured.
- */
- if (ksess->consumer_fds_sent) {
- ret = LTTCOMM_ENABLE_CONSUMER_FAIL;
- goto error;
- }
-
- consumer = ksess->tmp_consumer;
- if (consumer == NULL) {
- ret = LTTCOMM_OK;
- /* No temp. consumer output exists. Using the current one. */
- DBG3("No temporary consumer. Using default");
- consumer = ksess->consumer;
- goto error;
- }
-
- switch (consumer->type) {
- case CONSUMER_DST_LOCAL:
- DBG2("Consumer output is local. Creating directory(ies)");
-
- /* Create directory(ies) */
- ret = run_as_mkdir_recursive(consumer->dst.trace_path,
- S_IRWXU | S_IRWXG, session->uid, session->gid);
- if (ret < 0) {
- if (ret != -EEXIST) {
- ERR("Trace directory creation error");
- ret = LTTCOMM_FATAL;
- goto error;
- }
- }
- break;
- case CONSUMER_DST_NET:
- DBG2("Consumer output is network. Validating URIs");
- /* Validate if we have both control and data path set. */
- if (!consumer->dst.net.control_isset) {
- ret = LTTCOMM_URL_CTRL_MISS;
- goto error;
- }
-
- if (!consumer->dst.net.data_isset) {
- ret = LTTCOMM_URL_DATA_MISS;
- goto error;
- }
-
- /* Check established network session state */
- if (session->net_handle == 0) {
- ret = LTTCOMM_ENABLE_CONSUMER_FAIL;
- ERR("Session network handle is not set on enable-consumer");
+ /* Create directory(ies) on local filesystem. */
+ if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL &&
+ strlen(session->kernel_session->consumer->dst.trace_path) > 0) {
+ ret = run_as_mkdir_recursive(
+ session->kernel_session->consumer->dst.trace_path,
+ S_IRWXU | S_IRWXG, session->uid, session->gid);
+ if (ret < 0) {
+ if (ret != -EEXIST) {
+ ERR("Trace directory creation error");
goto error;
}
-
- break;
- }
-
- /* Append default kernel trace dir to subdir */
- strncat(ksess->consumer->subdir, DEFAULT_KERNEL_TRACE_DIR,
- sizeof(ksess->consumer->subdir));
-
- /*
- * @session-lock
- * This is race free for now since the session lock is acquired before
- * ending up in this function. No other threads can access this kernel
- * session without this lock hence freeing the consumer output object
- * is valid.
- */
- rcu_read_lock();
- consumer_destroy_output(ksess->consumer);
- rcu_read_unlock();
- ksess->consumer = consumer;
- ksess->tmp_consumer = NULL;
-
- break;
- case LTTNG_DOMAIN_UST:
- /* Code flow error if we don't have a UST session here. */
- assert(usess);
-
- /*
- * Check if we have already sent fds to the consumer. In that case,
- * the enable-consumer command can't be used because a start trace
- * had previously occured.
- */
- if (usess->start_trace) {
- ret = LTTCOMM_ENABLE_CONSUMER_FAIL;
- goto error;
}
+ }
- consumer = usess->tmp_consumer;
- if (consumer == NULL) {
- ret = LTTCOMM_OK;
- /* No temp. consumer output exists. Using the current one. */
- DBG3("No temporary consumer. Using default");
- consumer = usess->consumer;
- goto error;
- }
-
- switch (consumer->type) {
- case CONSUMER_DST_LOCAL:
- DBG2("Consumer output is local. Creating directory(ies)");
-
- /* Create directory(ies) */
- ret = run_as_mkdir_recursive(consumer->dst.trace_path,
- S_IRWXU | S_IRWXG, session->uid, session->gid);
- if (ret < 0) {
- if (ret != -EEXIST) {
- ERR("Trace directory creation error");
- ret = LTTCOMM_FATAL;
- goto error;
- }
- }
- break;
- case CONSUMER_DST_NET:
- DBG2("Consumer output is network. Validating URIs");
- /* Validate if we have both control and data path set. */
- if (!consumer->dst.net.control_isset) {
- ret = LTTCOMM_URL_CTRL_MISS;
- goto error;
- }
-
- if (!consumer->dst.net.data_isset) {
- ret = LTTCOMM_URL_DATA_MISS;
- goto error;
- }
-
- /* Check established network session state */
- if (session->net_handle == 0) {
- ret = LTTCOMM_ENABLE_CONSUMER_FAIL;
- DBG2("Session network handle is not set on enable-consumer");
- goto error;
- }
+ session->kernel_session->uid = session->uid;
+ session->kernel_session->gid = session->gid;
- if (consumer->net_seq_index == -1) {
- ret = LTTCOMM_ENABLE_CONSUMER_FAIL;
- DBG2("Network index is not set on the consumer");
- goto error;
- }
+ return LTTCOMM_OK;
- break;
- }
+error:
+ trace_kernel_destroy_session(session->kernel_session);
+ session->kernel_session = NULL;
+ return ret;
+}
- /* Append default kernel trace dir to subdir */
- strncat(usess->consumer->subdir, DEFAULT_UST_TRACE_DIR,
- sizeof(usess->consumer->subdir));
+/*
+ * Count number of session permitted by uid/gid.
+ */
+static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
+{
+ unsigned int i = 0;
+ struct ltt_session *session;
+ DBG("Counting number of available session for UID %d GID %d",
+ uid, gid);
+ cds_list_for_each_entry(session, &session_list_ptr->head, list) {
/*
- * @session-lock
- * This is race free for now since the session lock is acquired before
- * ending up in this function. No other threads can access this kernel
- * session without this lock hence freeing the consumer output object
- * is valid.
+ * Only list the sessions the user can control.
*/
- rcu_read_lock();
- consumer_destroy_output(usess->consumer);
- rcu_read_unlock();
- usess->consumer = consumer;
- usess->tmp_consumer = NULL;
-
- break;
- }
-
- /* Enable it */
- if (consumer) {
- consumer->enabled = 1;
- /* Success at this point */
- ret = LTTCOMM_OK;
- } else {
- /* Should not really happend... */
- ret = LTTCOMM_NO_CONSUMER;
+ if (!session_access_ok(session, uid, gid)) {
+ continue;
+ }
+ i++;
}
-
-error:
- return ret;
+ return i;
}
/*
case LTTNG_ENABLE_CHANNEL:
{
ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
- &cmd_ctx->lsm->u.channel.chan);
+ &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]);
break;
}
case LTTNG_ENABLE_CONSUMER:
{
ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
cmd_ctx->lsm->u.enable.channel_name,
- &cmd_ctx->lsm->u.enable.event);
+ &cmd_ctx->lsm->u.enable.event, kernel_poll_pipe[1]);
break;
}
case LTTNG_ENABLE_ALL_EVENT:
ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
cmd_ctx->lsm->u.enable.channel_name,
- cmd_ctx->lsm->u.enable.event.type);
+ cmd_ctx->lsm->u.enable.event.type, kernel_poll_pipe[1]);
break;
}
case LTTNG_LIST_TRACEPOINTS:
}
case LTTNG_DESTROY_SESSION:
{
- ret = cmd_destroy_session(cmd_ctx->session,
- cmd_ctx->lsm->session.name);
+ ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]);
/* Set session to NULL so we do not unlock it after free. */
cmd_ctx->session = NULL;
}
/* Filled the session array */
- list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
+ cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
}
case LTTNG_REGISTER_CONSUMER:
{
+ struct consumer_data *cdata;
+
+ switch (cmd_ctx->lsm->domain.type) {
+ case LTTNG_DOMAIN_KERNEL:
+ cdata = &kconsumer_data;
+ break;
+ default:
+ ret = LTTCOMM_UND;
+ goto error;
+ }
+
ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
- cmd_ctx->lsm->u.reg.path);
+ cmd_ctx->lsm->u.reg.path, cdata);
break;
}
case LTTNG_SET_FILTER:
/* Set up max poll set size */
lttng_poll_set_max_size();
- /*
- * Set network sequence index to 1 for streams to match a relayd socket on
- * the consumer side.
- */
- uatomic_set(&relayd_net_seq_idx, 1);
+ cmd_init();
/* Init all health thread counters. */
health_init(&health_thread_cmd);
projects / lttng-tools.git / commitdiff
