+++ /dev/null
-/*
- * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
- * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License, version 2 only, as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 51
- * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#define _LGPL_SOURCE
-#include <assert.h>
-#include <inttypes.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 <common/utils.h>
-#include <common/compat/string.h>
-
-#include "channel.h"
-#include "consumer.h"
-#include "event.h"
-#include "health-sessiond.h"
-#include "kernel.h"
-#include "kernel-consumer.h"
-#include "lttng-sessiond.h"
-#include "utils.h"
-#include "syscall.h"
-#include "agent.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. It must be accessed with the relayd_net_seq_idx_lock
- * held.
- */
-static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
-static uint64_t relayd_net_seq_idx;
-
-static int validate_event_name(const char *);
-static int validate_ust_event_name(const char *);
-static int cmd_enable_event_internal(struct ltt_session *session,
- struct lttng_domain *domain,
- char *channel_name, struct lttng_event *event,
- char *filter_expression,
- struct lttng_filter_bytecode *filter,
- struct lttng_event_exclusion *exclusion,
- int wpipe);
-
-/*
- * 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;
- }
-
- /*
- * Do we have a UST url set. If yes, this means we have both kernel and UST
- * to print.
- */
- if (*tmp_uurl != '\0') {
- ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
- tmp_urls, kdata_port, tmp_uurl, udata_port);
- } else {
- int dport;
- if (kuri || (!kuri && !uuri)) {
- dport = kdata_port;
- } else {
- /* No kernel URI, use the UST port. */
- dport = udata_port;
- }
- ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
- }
-
-error:
- return ret;
-}
-
-/*
- * Fill lttng_channel array of all channels.
- */
-static void list_lttng_channels(enum lttng_domain_type 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;
-
- rcu_read_lock();
- 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;
- channels[i].attr.tracefile_size = uchan->tracefile_size;
- channels[i].attr.tracefile_count = uchan->tracefile_count;
- switch (uchan->attr.output) {
- case LTTNG_UST_MMAP:
- default:
- channels[i].attr.output = LTTNG_EVENT_MMAP;
- break;
- }
- i++;
- }
- rcu_read_unlock();
- break;
- }
- default:
- break;
- }
-}
-
-static void increment_extended_len(const char *filter_expression,
- size_t *extended_len)
-{
- *extended_len += sizeof(struct lttcomm_event_extended_header);
-
- if (filter_expression) {
- *extended_len += strlen(filter_expression) + 1;
- }
-}
-
-static void append_extended_info(const char *filter_expression,
- void **extended_at)
-{
- struct lttcomm_event_extended_header extended_header;
- size_t filter_len = 0;
-
- if (filter_expression) {
- filter_len = strlen(filter_expression) + 1;
- }
-
- extended_header.filter_len = filter_len;
- memcpy(*extended_at, &extended_header, sizeof(extended_header));
- *extended_at += sizeof(extended_header);
- memcpy(*extended_at, filter_expression, filter_len);
- *extended_at += filter_len;
-}
-
-/*
- * Create a list of agent domain events.
- *
- * Return number of events in list on success or else a negative value.
- */
-static int list_lttng_agent_events(struct agent *agt,
- struct lttng_event **events, size_t *total_size)
-{
- int i = 0, ret = 0;
- unsigned int nb_event = 0;
- struct agent_event *event;
- struct lttng_event *tmp_events;
- struct lttng_ht_iter iter;
- size_t extended_len = 0;
- void *extended_at;
-
- assert(agt);
- assert(events);
-
- DBG3("Listing agent events");
-
- rcu_read_lock();
- nb_event = lttng_ht_get_count(agt->events);
- rcu_read_unlock();
- if (nb_event == 0) {
- ret = nb_event;
- *total_size = 0;
- goto error;
- }
-
- /* Compute required extended infos size */
- extended_len = nb_event * sizeof(struct lttcomm_event_extended_header);
-
- /*
- * This is only valid because the commands which add events are
- * processed in the same thread as the listing.
- */
- rcu_read_lock();
- cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
- increment_extended_len(event->filter_expression, &extended_len);
- }
- rcu_read_unlock();
-
- *total_size = nb_event * sizeof(*tmp_events) + extended_len;
- tmp_events = zmalloc(*total_size);
- if (!tmp_events) {
- PERROR("zmalloc agent events session");
- ret = -LTTNG_ERR_FATAL;
- goto error;
- }
-
- extended_at = ((uint8_t *) tmp_events) +
- nb_event * sizeof(struct lttng_event);
-
- rcu_read_lock();
- cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
- strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
- tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
- tmp_events[i].enabled = event->enabled;
- tmp_events[i].loglevel = event->loglevel_value;
- tmp_events[i].loglevel_type = event->loglevel_type;
- i++;
-
- /* Append extended info */
- append_extended_info(event->filter_expression, &extended_at);
- }
- rcu_read_unlock();
-
- *events = tmp_events;
- ret = nb_event;
-
-error:
- assert(nb_event == i);
- return ret;
-}
-
-/*
- * 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, size_t *total_size)
-{
- 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;
- size_t extended_len = 0;
- void *extended_at;
-
- 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 = LTTNG_ERR_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;
- *total_size = 0;
- goto error;
- }
-
- DBG3("Listing UST global %d events", nb_event);
-
- /* Compute required extended infos size */
- cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
- if (uevent->internal) {
- nb_event--;
- continue;
- }
-
- increment_extended_len(uevent->filter_expression,
- &extended_len);
- }
-
- *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
- tmp = zmalloc(*total_size);
- if (tmp == NULL) {
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
-
- extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event);
-
- cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
- if (uevent->internal) {
- /* This event should remain hidden from clients */
- continue;
- }
- 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;
- }
- if (uevent->exclusion) {
- tmp[i].exclusion = 1;
- }
- i++;
-
- /* Append extended info */
- append_extended_info(uevent->filter_expression, &extended_at);
- }
-
- 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, size_t *total_size)
-{
- int i = 0, ret;
- unsigned int nb_event;
- struct ltt_kernel_event *event;
- struct ltt_kernel_channel *kchan;
- size_t extended_len = 0;
- void *extended_at;
-
- kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
- if (kchan == NULL) {
- ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
- goto error;
- }
-
- nb_event = kchan->event_count;
-
- DBG("Listing events for channel %s", kchan->channel->name);
-
- if (nb_event == 0) {
- *total_size = 0;
- *events = NULL;
- goto syscall;
- }
-
- /* Compute required extended infos size */
- cds_list_for_each_entry(event, &kchan->events_list.head, list) {
- increment_extended_len(event->filter_expression, &extended_len);
- }
-
- *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
- *events = zmalloc(*total_size);
- if (*events == NULL) {
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
-
- extended_at = ((uint8_t *) events) +
- nb_event * sizeof(struct lttng_event);
-
- /* 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;
- (*events)[i].filter =
- (unsigned char) !!event->filter_expression;
-
- switch (event->event->instrumentation) {
- case LTTNG_KERNEL_TRACEPOINT:
- (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
- break;
- case LTTNG_KERNEL_KRETPROBE:
- (*events)[i].type = LTTNG_EVENT_FUNCTION;
- memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
- sizeof(struct lttng_kernel_kprobe));
- break;
- case LTTNG_KERNEL_KPROBE:
- (*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++;
-
- /* Append extended info */
- append_extended_info(event->filter_expression, &extended_at);
- }
-
-syscall:
- if (syscall_table) {
- ssize_t new_size;
-
- new_size = syscall_list_channel(kchan, events, nb_event);
- if (new_size < 0) {
- free(events);
- ret = -new_size;
- goto error;
- }
- nb_event = new_size;
- }
-
- return nb_event;
-
-error:
- /* Negate the error code to differentiate the size from an 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, enum lttng_domain_type domain,
- const char *session_name)
-{
- int ret = LTTNG_OK;
- const char *default_trace_dir;
-
- assert(uri);
-
- if (consumer == NULL) {
- DBG("No consumer detected. Don't add URI. Stopping.");
- ret = LTTNG_ERR_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");
-
- if (consumer->type == CONSUMER_DST_NET) {
- if ((uri->stype == LTTNG_STREAM_CONTROL &&
- consumer->dst.net.control_isset) ||
- (uri->stype == LTTNG_STREAM_DATA &&
- consumer->dst.net.data_isset)) {
- ret = LTTNG_ERR_URL_EXIST;
- goto error;
- }
- } else {
- memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
- }
-
- consumer->type = CONSUMER_DST_NET;
-
- /* Set URI into consumer output object */
- ret = consumer_set_network_uri(consumer, uri);
- if (ret < 0) {
- ret = -ret;
- 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.
- */
- ret = LTTNG_OK;
- goto error;
- }
-
- if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
- ret = consumer_set_subdir(consumer, session_name);
- if (ret < 0) {
- ret = LTTNG_ERR_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) - strlen(consumer->subdir) - 1);
- 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) -
- strlen(consumer->dst.trace_path) - 1);
- /* Flag consumer as local. */
- consumer->type = CONSUMER_DST_LOCAL;
- break;
- }
-
- ret = LTTNG_OK;
-
-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);
-
- rcu_read_lock();
-
- if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
- cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
- socket, node.node) {
- pthread_mutex_lock(socket->lock);
- ret = kernel_consumer_send_session(socket, session);
- pthread_mutex_unlock(socket->lock);
- if (ret < 0) {
- ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
- goto error;
- }
- }
- }
-
-error:
- rcu_read_unlock();
- 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 lttng_uri *uri,
- struct lttcomm_relayd_sock **relayd_sock)
-{
- int ret;
- struct lttcomm_relayd_sock *rsock;
-
- rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
- RELAYD_VERSION_COMM_MINOR);
- if (!rsock) {
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
-
- /*
- * Connect to relayd so we can proceed with a session creation. This call
- * can possibly block for an arbitrary amount of time to set the health
- * state to be in poll execution.
- */
- health_poll_entry();
- ret = relayd_connect(rsock);
- health_poll_exit();
- if (ret < 0) {
- ERR("Unable to reach lttng-relayd");
- ret = LTTNG_ERR_RELAYD_CONNECT_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(rsock);
- if (ret < 0) {
- ret = LTTNG_ERR_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 = LTTNG_ERR_INVALID;
- goto close_sock;
- }
-
- *relayd_sock = rsock;
-
- return LTTNG_OK;
-
-close_sock:
- /* The returned value is not useful since we are on an error path. */
- (void) relayd_close(rsock);
-free_sock:
- free(rsock);
-error:
- return ret;
-}
-
-/*
- * Connect to the relayd using URI and send the socket to the right consumer.
- */
-static int send_consumer_relayd_socket(enum lttng_domain_type domain,
- unsigned int session_id, struct lttng_uri *relayd_uri,
- struct consumer_output *consumer,
- struct consumer_socket *consumer_sock,
- char *session_name, char *hostname, int session_live_timer)
-{
- int ret;
- struct lttcomm_relayd_sock *rsock = NULL;
-
- /* Connect to relayd and make version check if uri is the control. */
- ret = create_connect_relayd(relayd_uri, &rsock);
- if (ret != LTTNG_OK) {
- goto error;
- }
- assert(rsock);
-
- /* Set the network sequence index if not set. */
- if (consumer->net_seq_index == (uint64_t) -1ULL) {
- pthread_mutex_lock(&relayd_net_seq_idx_lock);
- /*
- * Increment net_seq_idx because we are about to transfer the
- * new relayd socket to the consumer.
- * Assign unique key so the consumer can match streams.
- */
- consumer->net_seq_index = ++relayd_net_seq_idx;
- pthread_mutex_unlock(&relayd_net_seq_idx_lock);
- }
-
- /* Send relayd socket to consumer. */
- ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
- relayd_uri->stype, session_id,
- session_name, hostname, session_live_timer);
- if (ret < 0) {
- ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
- goto close_sock;
- }
-
- /* Flag that the corresponding socket was sent. */
- if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
- consumer_sock->control_sock_sent = 1;
- } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
- consumer_sock->data_sock_sent = 1;
- }
-
- ret = LTTNG_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:
- (void) relayd_close(rsock);
- free(rsock);
-
-error:
- if (ret != LTTNG_OK) {
- /*
- * The consumer output for this session should not be used anymore
- * since the relayd connection failed thus making any tracing or/and
- * streaming not usable.
- */
- consumer->enabled = 0;
- }
- 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(enum lttng_domain_type domain,
- unsigned int session_id, struct consumer_output *consumer,
- struct consumer_socket *sock, char *session_name,
- char *hostname, int session_live_timer)
-{
- int ret = LTTNG_OK;
-
- assert(consumer);
- assert(sock);
-
- /* Sending control relayd socket. */
- if (!sock->control_sock_sent) {
- ret = send_consumer_relayd_socket(domain, session_id,
- &consumer->dst.net.control, consumer, sock,
- session_name, hostname, session_live_timer);
- if (ret != LTTNG_OK) {
- goto error;
- }
- }
-
- /* Sending data relayd socket. */
- if (!sock->data_sock_sent) {
- ret = send_consumer_relayd_socket(domain, session_id,
- &consumer->dst.net.data, consumer, sock,
- session_name, hostname, session_live_timer);
- if (ret != LTTNG_OK) {
- goto error;
- }
- }
-
-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.
- */
-int cmd_setup_relayd(struct ltt_session *session)
-{
- int ret = LTTNG_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;
-
- DBG("Setting relayd for session %s", session->name);
-
- rcu_read_lock();
-
- 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) {
- pthread_mutex_lock(socket->lock);
- ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
- usess->consumer, socket,
- session->name, session->hostname,
- session->live_timer);
- pthread_mutex_unlock(socket->lock);
- if (ret != LTTNG_OK) {
- goto error;
- }
- /* Session is now ready for network streaming. */
- session->net_handle = 1;
- }
- }
-
- 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) {
- pthread_mutex_lock(socket->lock);
- ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
- ksess->consumer, socket,
- session->name, session->hostname,
- session->live_timer);
- pthread_mutex_unlock(socket->lock);
- if (ret != LTTNG_OK) {
- goto error;
- }
- /* Session is now ready for network streaming. */
- session->net_handle = 1;
- }
- }
-
-error:
- rcu_read_unlock();
- return ret;
-}
-
-/*
- * Start a kernel session by opening all necessary streams.
- */
-static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
-{
- int ret;
- struct ltt_kernel_channel *kchan;
-
- /* Open kernel metadata */
- if (ksess->metadata == NULL && ksess->output_traces) {
- ret = kernel_open_metadata(ksess);
- if (ret < 0) {
- ret = LTTNG_ERR_KERN_META_FAIL;
- goto error;
- }
- }
-
- /* Open kernel metadata stream */
- if (ksess->metadata && ksess->metadata_stream_fd < 0) {
- ret = kernel_open_metadata_stream(ksess);
- if (ret < 0) {
- ERR("Kernel create metadata stream failed");
- ret = LTTNG_ERR_KERN_STREAM_FAIL;
- goto error;
- }
- }
-
- /* For each channel */
- cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
- if (kchan->stream_count == 0) {
- ret = kernel_open_channel_stream(kchan);
- if (ret < 0) {
- ret = LTTNG_ERR_KERN_STREAM_FAIL;
- goto error;
- }
- /* Update the stream global counter */
- ksess->stream_count_global += ret;
- }
- }
-
- /* Setup kernel consumer socket and send fds to it */
- ret = init_kernel_tracing(ksess);
- if (ret != 0) {
- ret = LTTNG_ERR_KERN_START_FAIL;
- goto error;
- }
-
- /* This start the kernel tracing */
- ret = kernel_start_session(ksess);
- if (ret < 0) {
- ret = LTTNG_ERR_KERN_START_FAIL;
- goto error;
- }
-
- /* Quiescent wait after starting trace */
- kernel_wait_quiescent(kernel_tracer_fd);
-
- ksess->active = 1;
-
- ret = LTTNG_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
- */
-int cmd_disable_channel(struct ltt_session *session,
- enum lttng_domain_type domain, char *channel_name)
-{
- int ret;
- struct ltt_ust_session *usess;
-
- usess = session->ust_session;
-
- rcu_read_lock();
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- ret = channel_kernel_disable(session->kernel_session,
- channel_name);
- if (ret != LTTNG_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 = LTTNG_ERR_UST_CHAN_NOT_FOUND;
- goto error;
- }
-
- ret = channel_ust_disable(usess, uchan);
- if (ret != LTTNG_OK) {
- goto error;
- }
- break;
- }
- default:
- ret = LTTNG_ERR_UNKNOWN_DOMAIN;
- goto error;
- }
-
- ret = LTTNG_OK;
-
-error:
- rcu_read_unlock();
- return ret;
-}
-
-/*
- * Command LTTNG_TRACK_PID processed by the client thread.
- *
- * Called with session lock held.
- */
-int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain,
- int pid)
-{
- int ret;
-
- rcu_read_lock();
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- struct ltt_kernel_session *ksess;
-
- ksess = session->kernel_session;
-
- ret = kernel_track_pid(ksess, pid);
- if (ret != LTTNG_OK) {
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- break;
- }
- case LTTNG_DOMAIN_UST:
- {
- struct ltt_ust_session *usess;
-
- usess = session->ust_session;
-
- ret = trace_ust_track_pid(usess, pid);
- if (ret != LTTNG_OK) {
- goto error;
- }
- break;
- }
- default:
- ret = LTTNG_ERR_UNKNOWN_DOMAIN;
- goto error;
- }
-
- ret = LTTNG_OK;
-
-error:
- rcu_read_unlock();
- return ret;
-}
-
-/*
- * Command LTTNG_UNTRACK_PID processed by the client thread.
- *
- * Called with session lock held.
- */
-int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain,
- int pid)
-{
- int ret;
-
- rcu_read_lock();
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- struct ltt_kernel_session *ksess;
-
- ksess = session->kernel_session;
-
- ret = kernel_untrack_pid(ksess, pid);
- if (ret != LTTNG_OK) {
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- break;
- }
- case LTTNG_DOMAIN_UST:
- {
- struct ltt_ust_session *usess;
-
- usess = session->ust_session;
-
- ret = trace_ust_untrack_pid(usess, pid);
- if (ret != LTTNG_OK) {
- goto error;
- }
- break;
- }
- default:
- ret = LTTNG_ERR_UNKNOWN_DOMAIN;
- goto error;
- }
-
- ret = LTTNG_OK;
-
-error:
- rcu_read_unlock();
- 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,
- struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
-{
- int ret;
- struct ltt_ust_session *usess = session->ust_session;
- struct lttng_ht *chan_ht;
- size_t len;
-
- assert(session);
- assert(attr);
- assert(domain);
-
- len = lttng_strnlen(attr->name, sizeof(attr->name));
-
- /* Validate channel name */
- if (attr->name[0] == '.' ||
- memchr(attr->name, '/', len) != NULL) {
- ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
- goto end;
- }
-
- DBG("Enabling channel %s for session %s", attr->name, session->name);
-
- rcu_read_lock();
-
- /*
- * Don't try to enable a channel if the session has been started at
- * some point in time before. The tracer does not allow it.
- */
- if (session->has_been_started) {
- ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
- goto error;
- }
-
- /*
- * If the session is a live session, remove the switch timer, the
- * live timer does the same thing but sends also synchronisation
- * beacons for inactive streams.
- */
- if (session->live_timer > 0) {
- attr->attr.live_timer_interval = session->live_timer;
- attr->attr.switch_timer_interval = 0;
- }
-
- /*
- * The ringbuffer (both in user space and kernel) behave badly in overwrite
- * mode and with less than 2 subbuf so block it right away and send back an
- * invalid attribute error.
- */
- if (attr->attr.overwrite && attr->attr.num_subbuf < 2) {
- ret = LTTNG_ERR_INVALID;
- goto error;
- }
-
- switch (domain->type) {
- 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, wpipe);
- if (attr->name[0] != '\0') {
- session->kernel_session->has_non_default_channel = 1;
- }
- } else {
- ret = channel_kernel_enable(session->kernel_session, kchan);
- }
-
- if (ret != LTTNG_OK) {
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
- break;
- }
- case LTTNG_DOMAIN_UST:
- case LTTNG_DOMAIN_JUL:
- case LTTNG_DOMAIN_LOG4J:
- case LTTNG_DOMAIN_PYTHON:
- {
- struct ltt_ust_channel *uchan;
-
- /*
- * FIXME
- *
- * Current agent implementation limitations force us to allow
- * only one channel at once in "agent" subdomains. Each
- * subdomain has a default channel name which must be strictly
- * adhered to.
- */
- if (domain->type == LTTNG_DOMAIN_JUL) {
- if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME,
- LTTNG_SYMBOL_NAME_LEN)) {
- ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
- goto error;
- }
- } else if (domain->type == LTTNG_DOMAIN_LOG4J) {
- if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME,
- LTTNG_SYMBOL_NAME_LEN)) {
- ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
- goto error;
- }
- } else if (domain->type == LTTNG_DOMAIN_PYTHON) {
- if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME,
- LTTNG_SYMBOL_NAME_LEN)) {
- ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
- goto error;
- }
- }
-
- 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, attr, domain->buf_type);
- if (attr->name[0] != '\0') {
- usess->has_non_default_channel = 1;
- }
- } else {
- ret = channel_ust_enable(usess, uchan);
- }
- break;
- }
- default:
- ret = LTTNG_ERR_UNKNOWN_DOMAIN;
- goto error;
- }
-
-error:
- rcu_read_unlock();
-end:
- return ret;
-}
-
-/*
- * Command LTTNG_DISABLE_EVENT processed by the client thread.
- */
-int cmd_disable_event(struct ltt_session *session,
- enum lttng_domain_type domain, char *channel_name,
- struct lttng_event *event)
-{
- int ret;
- char *event_name;
-
- DBG("Disable event command for event \'%s\'", event->name);
-
- event_name = event->name;
- if (validate_event_name(event_name)) {
- ret = LTTNG_ERR_INVALID_EVENT_NAME;
- goto error;
- }
-
- /* Error out on unhandled search criteria */
- if (event->loglevel_type || event->loglevel != -1 || event->enabled
- || event->pid || event->filter || event->exclusion) {
- ret = LTTNG_ERR_UNK;
- goto error;
- }
-
- rcu_read_lock();
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- struct ltt_kernel_channel *kchan;
- struct ltt_kernel_session *ksess;
-
- ksess = session->kernel_session;
-
- /*
- * If a non-default channel has been created in the
- * session, explicitely require that -c chan_name needs
- * to be provided.
- */
- if (ksess->has_non_default_channel && channel_name[0] == '\0') {
- ret = LTTNG_ERR_NEED_CHANNEL_NAME;
- goto error_unlock;
- }
-
- kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
- if (kchan == NULL) {
- ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
- goto error_unlock;
- }
-
- switch (event->type) {
- case LTTNG_EVENT_ALL:
- case LTTNG_EVENT_TRACEPOINT:
- case LTTNG_EVENT_SYSCALL:
- case LTTNG_EVENT_PROBE:
- case LTTNG_EVENT_FUNCTION:
- case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */
- if (event_name[0] == '\0') {
- ret = event_kernel_disable_event(kchan,
- NULL, event->type);
- } else {
- ret = event_kernel_disable_event(kchan,
- event_name, event->type);
- }
- if (ret != LTTNG_OK) {
- goto error_unlock;
- }
- break;
- default:
- ret = LTTNG_ERR_UNK;
- goto error_unlock;
- }
-
- 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;
-
- if (validate_ust_event_name(event_name)) {
- ret = LTTNG_ERR_INVALID_EVENT_NAME;
- goto error_unlock;
- }
-
- /*
- * If a non-default channel has been created in the
- * session, explicitly require that -c chan_name needs
- * to be provided.
- */
- if (usess->has_non_default_channel && channel_name[0] == '\0') {
- ret = LTTNG_ERR_NEED_CHANNEL_NAME;
- goto error_unlock;
- }
-
- uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
- channel_name);
- if (uchan == NULL) {
- ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
- goto error_unlock;
- }
-
- switch (event->type) {
- case LTTNG_EVENT_ALL:
- /*
- * An empty event name means that everything
- * should be disabled.
- */
- if (event->name[0] == '\0') {
- ret = event_ust_disable_all_tracepoints(usess, uchan);
- } else {
- ret = event_ust_disable_tracepoint(usess, uchan,
- event_name);
- }
- if (ret != LTTNG_OK) {
- goto error_unlock;
- }
- break;
- default:
- ret = LTTNG_ERR_UNK;
- goto error_unlock;
- }
-
- DBG3("Disable UST event %s in channel %s completed", event_name,
- channel_name);
- break;
- }
- case LTTNG_DOMAIN_LOG4J:
- case LTTNG_DOMAIN_JUL:
- case LTTNG_DOMAIN_PYTHON:
- {
- struct agent *agt;
- struct ltt_ust_session *usess = session->ust_session;
-
- assert(usess);
-
- switch (event->type) {
- case LTTNG_EVENT_ALL:
- break;
- default:
- ret = LTTNG_ERR_UNK;
- goto error_unlock;
- }
-
- agt = trace_ust_find_agent(usess, domain);
- if (!agt) {
- ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
- goto error_unlock;
- }
- /*
- * An empty event name means that everything
- * should be disabled.
- */
- if (event->name[0] == '\0') {
- ret = event_agent_disable_all(usess, agt);
- } else {
- ret = event_agent_disable(usess, agt, event_name);
- }
- if (ret != LTTNG_OK) {
- goto error_unlock;
- }
-
- break;
- }
- default:
- ret = LTTNG_ERR_UND;
- goto error_unlock;
- }
-
- ret = LTTNG_OK;
-
-error_unlock:
- rcu_read_unlock();
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_ADD_CONTEXT processed by the client thread.
- */
-int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain,
- char *channel_name, struct lttng_event_context *ctx, int kwpipe)
-{
- int ret, chan_kern_created = 0, chan_ust_created = 0;
- char *app_ctx_provider_name = NULL, *app_ctx_name = NULL;
-
- if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
- app_ctx_provider_name = ctx->u.app_ctx.provider_name;
- app_ctx_name = ctx->u.app_ctx.ctx_name;
- }
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- assert(session->kernel_session);
-
- if (session->kernel_session->channel_count == 0) {
- /* Create default channel */
- ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
- if (ret != LTTNG_OK) {
- goto error;
- }
- chan_kern_created = 1;
- }
- /* Add kernel context to kernel tracer */
- ret = context_kernel_add(session->kernel_session, ctx, channel_name);
- if (ret != LTTNG_OK) {
- goto error;
- }
- break;
- case LTTNG_DOMAIN_JUL:
- case LTTNG_DOMAIN_LOG4J:
- {
- /*
- * Validate channel name.
- * If no channel name is given and the domain is JUL or LOG4J,
- * set it to the appropriate domain-specific channel name. If
- * a name is provided but does not match the expexted channel
- * name, return an error.
- */
- if (domain == LTTNG_DOMAIN_JUL && *channel_name &&
- strcmp(channel_name,
- DEFAULT_JUL_CHANNEL_NAME)) {
- ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
- goto error;
- } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name &&
- strcmp(channel_name,
- DEFAULT_LOG4J_CHANNEL_NAME)) {
- ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
- goto error;
- }
- /* break is _not_ missing here. */
- }
- case LTTNG_DOMAIN_UST:
- {
- struct ltt_ust_session *usess = session->ust_session;
- unsigned int chan_count;
-
- assert(usess);
-
- chan_count = lttng_ht_get_count(usess->domain_global.channels);
- if (chan_count == 0) {
- struct lttng_channel *attr;
- /* Create default channel */
- attr = channel_new_default_attr(domain, usess->buffer_type);
- if (attr == NULL) {
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
-
- ret = channel_ust_create(usess, attr, usess->buffer_type);
- if (ret != LTTNG_OK) {
- free(attr);
- goto error;
- }
- free(attr);
- chan_ust_created = 1;
- }
-
- ret = context_ust_add(usess, domain, ctx, channel_name);
- free(app_ctx_provider_name);
- free(app_ctx_name);
- app_ctx_name = NULL;
- app_ctx_provider_name = NULL;
- if (ret != LTTNG_OK) {
- goto error;
- }
- break;
- }
- default:
- ret = LTTNG_ERR_UND;
- goto error;
- }
-
- ret = LTTNG_OK;
- goto end;
-
-error:
- if (chan_kern_created) {
- struct ltt_kernel_channel *kchan =
- trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
- session->kernel_session);
- /* Created previously, this should NOT fail. */
- assert(kchan);
- kernel_destroy_channel(kchan);
- }
-
- if (chan_ust_created) {
- struct ltt_ust_channel *uchan =
- trace_ust_find_channel_by_name(
- session->ust_session->domain_global.channels,
- DEFAULT_CHANNEL_NAME);
- /* Created previously, this should NOT fail. */
- assert(uchan);
- /* Remove from the channel list of the session. */
- trace_ust_delete_channel(session->ust_session->domain_global.channels,
- uchan);
- trace_ust_destroy_channel(uchan);
- }
-end:
- free(app_ctx_provider_name);
- free(app_ctx_name);
- return ret;
-}
-
-static int validate_event_name(const char *name)
-{
- int ret = 0;
- const char *c = name;
- const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN;
- bool null_terminated = false;
-
- /*
- * Make sure that unescaped wildcards are only used as the last
- * character of the event name.
- */
- while (c < event_name_end) {
- switch (*c) {
- case '\0':
- null_terminated = true;
- goto end;
- case '\\':
- c++;
- break;
- case '*':
- if ((c + 1) < event_name_end && *(c + 1)) {
- /* Wildcard is not the last character */
- ret = LTTNG_ERR_INVALID_EVENT_NAME;
- goto end;
- }
- default:
- break;
- }
- c++;
- }
-end:
- if (!ret && !null_terminated) {
- ret = LTTNG_ERR_INVALID_EVENT_NAME;
- }
- return ret;
-}
-
-static inline bool name_starts_with(const char *name, const char *prefix)
-{
- const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN);
-
- return !strncmp(name, prefix, max_cmp_len);
-}
-
-/* Perform userspace-specific event name validation */
-static int validate_ust_event_name(const char *name)
-{
- int ret = 0;
-
- if (!name) {
- ret = -1;
- goto end;
- }
-
- /*
- * Check name against all internal UST event component namespaces used
- * by the agents.
- */
- if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) ||
- name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) ||
- name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) {
- ret = -1;
- }
-
-end:
- return ret;
-}
-
-/*
- * Internal version of cmd_enable_event() with a supplemental
- * "internal_event" flag which is used to enable internal events which should
- * be hidden from clients. Such events are used in the agent implementation to
- * enable the events through which all "agent" events are funeled.
- */
-static int _cmd_enable_event(struct ltt_session *session,
- struct lttng_domain *domain,
- char *channel_name, struct lttng_event *event,
- char *filter_expression,
- struct lttng_filter_bytecode *filter,
- struct lttng_event_exclusion *exclusion,
- int wpipe, bool internal_event)
-{
- int ret, channel_created = 0;
- struct lttng_channel *attr;
-
- assert(session);
- assert(event);
- assert(channel_name);
-
- /* If we have a filter, we must have its filter expression */
- assert(!(!!filter_expression ^ !!filter));
-
- DBG("Enable event command for event \'%s\'", event->name);
-
- rcu_read_lock();
-
- ret = validate_event_name(event->name);
- if (ret) {
- goto error;
- }
-
- switch (domain->type) {
- case LTTNG_DOMAIN_KERNEL:
- {
- struct ltt_kernel_channel *kchan;
-
- /*
- * If a non-default channel has been created in the
- * session, explicitely require that -c chan_name needs
- * to be provided.
- */
- if (session->kernel_session->has_non_default_channel
- && channel_name[0] == '\0') {
- ret = LTTNG_ERR_NEED_CHANNEL_NAME;
- goto error;
- }
-
- kchan = trace_kernel_get_channel_by_name(channel_name,
- session->kernel_session);
- if (kchan == NULL) {
- attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
- LTTNG_BUFFER_GLOBAL);
- if (attr == NULL) {
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
- strncpy(attr->name, channel_name, sizeof(attr->name));
-
- ret = cmd_enable_channel(session, domain, attr, wpipe);
- if (ret != LTTNG_OK) {
- free(attr);
- goto error;
- }
- free(attr);
-
- channel_created = 1;
- }
-
- /* 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 = LTTNG_ERR_FATAL;
- goto error;
- }
-
- switch (event->type) {
- case LTTNG_EVENT_ALL:
- {
- char *filter_expression_a = NULL;
- struct lttng_filter_bytecode *filter_a = NULL;
-
- /*
- * We need to duplicate filter_expression and filter,
- * because ownership is passed to first enable
- * event.
- */
- if (filter_expression) {
- filter_expression_a = strdup(filter_expression);
- if (!filter_expression_a) {
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
- }
- if (filter) {
- filter_a = zmalloc(sizeof(*filter_a) + filter->len);
- if (!filter_a) {
- free(filter_expression_a);
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
- memcpy(filter_a, filter, sizeof(*filter_a) + filter->len);
- }
- event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */
- ret = event_kernel_enable_event(kchan, event,
- filter_expression, filter);
- /* We have passed ownership */
- filter_expression = NULL;
- filter = NULL;
- if (ret != LTTNG_OK) {
- if (channel_created) {
- /* Let's not leak a useless channel. */
- kernel_destroy_channel(kchan);
- }
- free(filter_expression_a);
- free(filter_a);
- goto error;
- }
- event->type = LTTNG_EVENT_SYSCALL; /* Hack */
- ret = event_kernel_enable_event(kchan, event,
- filter_expression_a, filter_a);
- /* We have passed ownership */
- filter_expression_a = NULL;
- filter_a = NULL;
- if (ret != LTTNG_OK) {
- goto error;
- }
- break;
- }
- case LTTNG_EVENT_PROBE:
- case LTTNG_EVENT_FUNCTION:
- case LTTNG_EVENT_FUNCTION_ENTRY:
- case LTTNG_EVENT_TRACEPOINT:
- ret = event_kernel_enable_event(kchan, event,
- filter_expression, filter);
- /* We have passed ownership */
- filter_expression = NULL;
- filter = NULL;
- if (ret != LTTNG_OK) {
- if (channel_created) {
- /* Let's not leak a useless channel. */
- kernel_destroy_channel(kchan);
- }
- goto error;
- }
- break;
- case LTTNG_EVENT_SYSCALL:
- ret = event_kernel_enable_event(kchan, event,
- filter_expression, filter);
- /* We have passed ownership */
- filter_expression = NULL;
- filter = NULL;
- if (ret != LTTNG_OK) {
- goto error;
- }
- break;
- default:
- ret = LTTNG_ERR_UNK;
- 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);
-
- /*
- * If a non-default channel has been created in the
- * session, explicitely require that -c chan_name needs
- * to be provided.
- */
- if (usess->has_non_default_channel && channel_name[0] == '\0') {
- ret = LTTNG_ERR_NEED_CHANNEL_NAME;
- goto error;
- }
-
- /* 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(LTTNG_DOMAIN_UST,
- usess->buffer_type);
- if (attr == NULL) {
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
- strncpy(attr->name, channel_name, sizeof(attr->name));
-
- ret = cmd_enable_channel(session, domain, attr, wpipe);
- if (ret != LTTNG_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);
- }
-
- if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) {
- /*
- * Don't allow users to add UST events to channels which
- * are assigned to a userspace subdomain (JUL, Log4J,
- * Python, etc.).
- */
- ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN;
- goto error;
- }
-
- if (!internal_event) {
- /*
- * Ensure the event name is not reserved for internal
- * use.
- */
- ret = validate_ust_event_name(event->name);
- if (ret) {
- WARN("Userspace event name %s failed validation.",
- event->name ?
- event->name : "NULL");
- ret = LTTNG_ERR_INVALID_EVENT_NAME;
- goto error;
- }
- }
-
- /* At this point, the session and channel exist on the tracer */
- ret = event_ust_enable_tracepoint(usess, uchan, event,
- filter_expression, filter, exclusion,
- internal_event);
- /* We have passed ownership */
- filter_expression = NULL;
- filter = NULL;
- exclusion = NULL;
- if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
- goto already_enabled;
- } else if (ret != LTTNG_OK) {
- goto error;
- }
- break;
- }
- case LTTNG_DOMAIN_LOG4J:
- case LTTNG_DOMAIN_JUL:
- case LTTNG_DOMAIN_PYTHON:
- {
- const char *default_event_name, *default_chan_name;
- struct agent *agt;
- struct lttng_event uevent;
- struct lttng_domain tmp_dom;
- struct ltt_ust_session *usess = session->ust_session;
-
- assert(usess);
-
- agt = trace_ust_find_agent(usess, domain->type);
- if (!agt) {
- agt = agent_create(domain->type);
- if (!agt) {
- ret = LTTNG_ERR_NOMEM;
- goto error;
- }
- agent_add(agt, usess->agents);
- }
-
- /* Create the default tracepoint. */
- memset(&uevent, 0, sizeof(uevent));
- uevent.type = LTTNG_EVENT_TRACEPOINT;
- uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
- default_event_name = event_get_default_agent_ust_name(
- domain->type);
- if (!default_event_name) {
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
- strncpy(uevent.name, default_event_name, sizeof(uevent.name));
- uevent.name[sizeof(uevent.name) - 1] = '\0';
-
- /*
- * The domain type is changed because we are about to enable the
- * default channel and event for the JUL domain that are hardcoded.
- * This happens in the UST domain.
- */
- memcpy(&tmp_dom, domain, sizeof(tmp_dom));
- tmp_dom.type = LTTNG_DOMAIN_UST;
-
- switch (domain->type) {
- case LTTNG_DOMAIN_LOG4J:
- default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
- break;
- case LTTNG_DOMAIN_JUL:
- default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
- break;
- case LTTNG_DOMAIN_PYTHON:
- default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
- break;
- default:
- /* The switch/case we are in makes this impossible */
- assert(0);
- }
-
- {
- char *filter_expression_copy = NULL;
- struct lttng_filter_bytecode *filter_copy = NULL;
-
- if (filter) {
- const size_t filter_size = sizeof(
- struct lttng_filter_bytecode)
- + filter->len;
-
- filter_copy = zmalloc(filter_size);
- if (!filter_copy) {
- ret = LTTNG_ERR_NOMEM;
- goto error;
- }
- memcpy(filter_copy, filter, filter_size);
-
- filter_expression_copy =
- strdup(filter_expression);
- if (!filter_expression) {
- ret = LTTNG_ERR_NOMEM;
- }
-
- if (!filter_expression_copy || !filter_copy) {
- free(filter_expression_copy);
- free(filter_copy);
- goto error;
- }
- }
-
- ret = cmd_enable_event_internal(session, &tmp_dom,
- (char *) default_chan_name,
- &uevent, filter_expression_copy,
- filter_copy, NULL, wpipe);
- }
-
- if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
- goto already_enabled;
- } else if (ret != LTTNG_OK) {
- goto error;
- }
-
- /* The wild card * means that everything should be enabled. */
- if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
- ret = event_agent_enable_all(usess, agt, event, filter,
- filter_expression);
- } else {
- ret = event_agent_enable(usess, agt, event, filter,
- filter_expression);
- }
- filter = NULL;
- filter_expression = NULL;
- if (ret != LTTNG_OK) {
- goto error;
- }
-
- break;
- }
- default:
- ret = LTTNG_ERR_UND;
- goto error;
- }
-
- ret = LTTNG_OK;
-
-already_enabled:
-error:
- free(filter_expression);
- free(filter);
- free(exclusion);
- rcu_read_unlock();
- return ret;
-}
-
-/*
- * Command LTTNG_ENABLE_EVENT processed by the client thread.
- * We own filter, exclusion, and filter_expression.
- */
-int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
- char *channel_name, struct lttng_event *event,
- char *filter_expression,
- struct lttng_filter_bytecode *filter,
- struct lttng_event_exclusion *exclusion,
- int wpipe)
-{
- return _cmd_enable_event(session, domain, channel_name, event,
- filter_expression, filter, exclusion, wpipe, false);
-}
-
-/*
- * Enable an event which is internal to LTTng. An internal should
- * never be made visible to clients and are immune to checks such as
- * reserved names.
- */
-static int cmd_enable_event_internal(struct ltt_session *session,
- struct lttng_domain *domain,
- char *channel_name, struct lttng_event *event,
- char *filter_expression,
- struct lttng_filter_bytecode *filter,
- struct lttng_event_exclusion *exclusion,
- int wpipe)
-{
- return _cmd_enable_event(session, domain, channel_name, event,
- filter_expression, filter, exclusion, wpipe, true);
-}
-
-/*
- * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
- */
-ssize_t cmd_list_tracepoints(enum lttng_domain_type 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 = LTTNG_ERR_KERN_LIST_FAIL;
- goto error;
- }
- break;
- case LTTNG_DOMAIN_UST:
- nb_events = ust_app_list_events(events);
- if (nb_events < 0) {
- ret = LTTNG_ERR_UST_LIST_FAIL;
- goto error;
- }
- break;
- case LTTNG_DOMAIN_LOG4J:
- case LTTNG_DOMAIN_JUL:
- case LTTNG_DOMAIN_PYTHON:
- nb_events = agent_list_events(events, domain);
- if (nb_events < 0) {
- ret = LTTNG_ERR_UST_LIST_FAIL;
- goto error;
- }
- break;
- default:
- ret = LTTNG_ERR_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(enum lttng_domain_type 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 = LTTNG_ERR_UST_LIST_FAIL;
- goto error;
- }
- break;
- case LTTNG_DOMAIN_KERNEL:
- default: /* fall-through */
- ret = LTTNG_ERR_UND;
- goto error;
- }
-
- return nb_fields;
-
-error:
- /* Return negative value to differentiate return code */
- return -ret;
-}
-
-ssize_t cmd_list_syscalls(struct lttng_event **events)
-{
- return syscall_table_list(events);
-}
-
-/*
- * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
- *
- * Called with session lock held.
- */
-ssize_t cmd_list_tracker_pids(struct ltt_session *session,
- enum lttng_domain_type domain, int32_t **pids)
-{
- int ret;
- ssize_t nr_pids = 0;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- struct ltt_kernel_session *ksess;
-
- ksess = session->kernel_session;
- nr_pids = kernel_list_tracker_pids(ksess, pids);
- if (nr_pids < 0) {
- ret = LTTNG_ERR_KERN_LIST_FAIL;
- goto error;
- }
- break;
- }
- case LTTNG_DOMAIN_UST:
- {
- struct ltt_ust_session *usess;
-
- usess = session->ust_session;
- nr_pids = trace_ust_list_tracker_pids(usess, pids);
- if (nr_pids < 0) {
- ret = LTTNG_ERR_UST_LIST_FAIL;
- goto error;
- }
- break;
- }
- case LTTNG_DOMAIN_LOG4J:
- case LTTNG_DOMAIN_JUL:
- case LTTNG_DOMAIN_PYTHON:
- default:
- ret = LTTNG_ERR_UND;
- goto error;
- }
-
- return nr_pids;
-
-error:
- /* Return negative value to differentiate return code */
- return -ret;
-}
-
-/*
- * Command LTTNG_START_TRACE processed by the client thread.
- *
- * Called with session mutex held.
- */
-int cmd_start_trace(struct ltt_session *session)
-{
- int ret;
- unsigned long nb_chan = 0;
- struct ltt_kernel_session *ksession;
- struct ltt_ust_session *usess;
-
- assert(session);
-
- /* Ease our life a bit ;) */
- ksession = session->kernel_session;
- usess = session->ust_session;
-
- /* Is the session already started? */
- if (session->active) {
- ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
- goto error;
- }
-
- /*
- * Starting a session without channel is useless since after that it's not
- * possible to enable channel thus inform the client.
- */
- if (usess && usess->domain_global.channels) {
- nb_chan += lttng_ht_get_count(usess->domain_global.channels);
- }
- if (ksession) {
- nb_chan += ksession->channel_count;
- }
- if (!nb_chan) {
- ret = LTTNG_ERR_NO_CHANNEL;
- goto error;
- }
-
- /* Kernel tracing */
- if (ksession != NULL) {
- ret = start_kernel_session(ksession, kernel_tracer_fd);
- if (ret != LTTNG_OK) {
- goto error;
- }
- }
-
- /* Flag session that trace should start automatically */
- if (usess) {
- /*
- * Even though the start trace might fail, flag this session active so
- * other application coming in are started by default.
- */
- usess->active = 1;
-
- ret = ust_app_start_trace_all(usess);
- if (ret < 0) {
- ret = LTTNG_ERR_UST_START_FAIL;
- goto error;
- }
- }
-
- /* Flag this after a successful start. */
- session->has_been_started = 1;
- session->active = 1;
-
- ret = LTTNG_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;
-
- /* Session is not active. Skip everythong and inform the client. */
- if (!session->active) {
- ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
- goto error;
- }
-
- /* Kernel tracer */
- if (ksession && ksession->active) {
- 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 = LTTNG_ERR_KERN_STOP_FAIL;
- goto error;
- }
-
- kernel_wait_quiescent(kernel_tracer_fd);
-
- ksession->active = 0;
- }
-
- if (usess && usess->active) {
- /*
- * Even though the stop trace might fail, flag this session inactive so
- * other application coming in are not started by default.
- */
- usess->active = 0;
-
- ret = ust_app_stop_trace_all(usess);
- if (ret < 0) {
- ret = LTTNG_ERR_UST_STOP_FAIL;
- goto error;
- }
- }
-
- /* Flag inactive after a successful stop. */
- session->active = 0;
- ret = LTTNG_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
- */
-int cmd_set_consumer_uri(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;
-
- assert(session);
- assert(uris);
- assert(nb_uri > 0);
-
- /* Can't set consumer URI if the session is active. */
- if (session->active) {
- ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
- goto error;
- }
-
- /* Set the "global" consumer URIs */
- for (i = 0; i < nb_uri; i++) {
- ret = add_uri_to_consumer(session->consumer,
- &uris[i], 0, session->name);
- if (ret != LTTNG_OK) {
- goto error;
- }
- }
-
- /* Set UST session URIs */
- if (session->ust_session) {
- for (i = 0; i < nb_uri; i++) {
- ret = add_uri_to_consumer(
- session->ust_session->consumer,
- &uris[i], LTTNG_DOMAIN_UST,
- session->name);
- if (ret != LTTNG_OK) {
- goto error;
- }
- }
- }
-
- /* Set kernel session URIs */
- if (session->kernel_session) {
- for (i = 0; i < nb_uri; i++) {
- ret = add_uri_to_consumer(
- session->kernel_session->consumer,
- &uris[i], LTTNG_DOMAIN_KERNEL,
- session->name);
- if (ret != LTTNG_OK) {
- goto error;
- }
- }
- }
-
- /*
- * Make sure to set the session in output mode after we set URI since a
- * session can be created without URL (thus flagged in no output mode).
- */
- session->output_traces = 1;
- if (ksess) {
- ksess->output_traces = 1;
- }
-
- if (usess) {
- usess->output_traces = 1;
- }
-
- /* All good! */
- ret = LTTNG_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, unsigned int live_timer)
-{
- int ret;
- struct ltt_session *session;
-
- assert(name);
- assert(creds);
-
- /*
- * 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 = LTTNG_ERR_EXIST_SESS;
- goto find_error;
- }
-
- /* Create tracing session in the registry */
- ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
- LTTNG_SOCK_GET_GID_CRED(creds));
- if (ret != LTTNG_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);
-
- session->live_timer = live_timer;
- /* Create default consumer output for the session not yet created. */
- session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
- if (session->consumer == NULL) {
- ret = LTTNG_ERR_FATAL;
- goto consumer_error;
- }
-
- if (uris) {
- ret = cmd_set_consumer_uri(session, nb_uri, uris);
- if (ret != LTTNG_OK) {
- goto consumer_error;
- }
- session->output_traces = 1;
- } else {
- session->output_traces = 0;
- DBG2("Session %s created with no output", session->name);
- }
-
- session->consumer->enabled = 1;
-
- return LTTNG_OK;
-
-consumer_error:
- session_destroy(session);
-session_error:
-find_error:
- return ret;
-}
-
-/*
- * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
- */
-int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
- size_t nb_uri, lttng_sock_cred *creds)
-{
- int ret;
- struct ltt_session *session;
- struct snapshot_output *new_output = NULL;
-
- assert(name);
- assert(creds);
-
- /*
- * Create session in no output mode with URIs set to NULL. The uris we've
- * received are for a default snapshot output if one.
- */
- ret = cmd_create_session_uri(name, NULL, 0, creds, 0);
- if (ret != LTTNG_OK) {
- goto error;
- }
-
- /* Get the newly created session pointer back. This should NEVER fail. */
- session = session_find_by_name(name);
- assert(session);
-
- /* Flag session for snapshot mode. */
- session->snapshot_mode = 1;
-
- /* Skip snapshot output creation if no URI is given. */
- if (nb_uri == 0) {
- goto end;
- }
-
- new_output = snapshot_output_alloc();
- if (!new_output) {
- ret = LTTNG_ERR_NOMEM;
- goto error_snapshot_alloc;
- }
-
- ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
- uris, nb_uri, session->consumer, new_output, &session->snapshot);
- if (ret < 0) {
- if (ret == -ENOMEM) {
- ret = LTTNG_ERR_NOMEM;
- } else {
- ret = LTTNG_ERR_INVALID;
- }
- goto error_snapshot;
- }
-
- rcu_read_lock();
- snapshot_add_output(&session->snapshot, new_output);
- rcu_read_unlock();
-
-end:
- return LTTNG_OK;
-
-error_snapshot:
- snapshot_output_destroy(new_output);
-error_snapshot_alloc:
- session_destroy(session);
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_DESTROY_SESSION processed by the client thread.
- *
- * Called with session lock held.
- */
-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(enum lttng_domain_type domain,
- struct lttng_calibrate *calibrate)
-{
- int ret;
-
- switch (domain) {
- case LTTNG_DOMAIN_KERNEL:
- {
- struct lttng_kernel_calibrate kcalibrate;
-
- switch (calibrate->type) {
- case LTTNG_CALIBRATE_FUNCTION:
- default:
- /* Default and only possible calibrate option. */
- kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
- break;
- }
-
- ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
- if (ret < 0) {
- ret = LTTNG_ERR_KERN_ENABLE_FAIL;
- goto error;
- }
- break;
- }
- case LTTNG_DOMAIN_UST:
- {
- struct lttng_ust_calibrate ucalibrate;
-
- switch (calibrate->type) {
- case LTTNG_CALIBRATE_FUNCTION:
- default:
- /* Default and only possible calibrate option. */
- ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
- break;
- }
-
- ret = ust_app_calibrate_glb(&ucalibrate);
- if (ret < 0) {
- ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
- goto error;
- }
- break;
- }
- default:
- ret = LTTNG_ERR_UND;
- goto error;
- }
-
- ret = LTTNG_OK;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
- */
-int cmd_register_consumer(struct ltt_session *session,
- enum lttng_domain_type domain, const char *sock_path,
- struct consumer_data *cdata)
-{
- int ret, sock;
- struct consumer_socket *socket = NULL;
-
- 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 = LTTNG_ERR_KERN_CONSUMER_FAIL;
- goto error;
- }
-
- sock = lttcomm_connect_unix_sock(sock_path);
- if (sock < 0) {
- ret = LTTNG_ERR_CONNECT_FAIL;
- goto error;
- }
- cdata->cmd_sock = sock;
-
- socket = consumer_allocate_socket(&cdata->cmd_sock);
- if (socket == NULL) {
- ret = close(sock);
- if (ret < 0) {
- PERROR("close register consumer");
- }
- cdata->cmd_sock = -1;
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
-
- socket->lock = zmalloc(sizeof(pthread_mutex_t));
- if (socket->lock == NULL) {
- PERROR("zmalloc pthread mutex");
- ret = LTTNG_ERR_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 = LTTNG_ERR_UND;
- goto error;
- }
-
- return LTTNG_OK;
-
-error:
- if (socket) {
- consumer_destroy_socket(socket);
- }
- 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;
- struct agent *agt;
- struct lttng_ht_iter iter;
-
- 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++;
-
- rcu_read_lock();
- cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
- agt, node.node) {
- if (agt->being_used) {
- nb_dom++;
- }
- }
- rcu_read_unlock();
- }
-
- if (!nb_dom) {
- goto end;
- }
-
- *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
- if (*domains == NULL) {
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
-
- if (session->kernel_session != NULL) {
- (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
-
- /* Kernel session buffer type is always GLOBAL */
- (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL;
-
- index++;
- }
-
- if (session->ust_session != NULL) {
- (*domains)[index].type = LTTNG_DOMAIN_UST;
- (*domains)[index].buf_type = session->ust_session->buffer_type;
- index++;
-
- rcu_read_lock();
- cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
- agt, node.node) {
- if (agt->being_used) {
- (*domains)[index].type = agt->domain;
- (*domains)[index].buf_type = session->ust_session->buffer_type;
- index++;
- }
- }
- rcu_read_unlock();
- }
-end:
- return nb_dom;
-
-error:
- /* Return negative value to differentiate return code */
- return -ret;
-}
-
-
-/*
- * Command LTTNG_LIST_CHANNELS processed by the client thread.
- */
-ssize_t cmd_list_channels(enum lttng_domain_type 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);
- if (nb_chan <= 0) {
- ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
- }
- break;
- case LTTNG_DOMAIN_UST:
- if (session->ust_session != NULL) {
- rcu_read_lock();
- nb_chan = lttng_ht_get_count(
- session->ust_session->domain_global.channels);
- rcu_read_unlock();
- }
- DBG3("Number of UST global channels %zd", nb_chan);
- if (nb_chan < 0) {
- ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
- goto error;
- }
- break;
- default:
- ret = LTTNG_ERR_UND;
- goto error;
- }
-
- if (nb_chan > 0) {
- *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
- if (*channels == NULL) {
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
-
- list_lttng_channels(domain, session, *channels);
- }
-
- return nb_chan;
-
-error:
- /* Return negative value to differentiate return code */
- return -ret;
-}
-
-/*
- * Command LTTNG_LIST_EVENTS processed by the client thread.
- */
-ssize_t cmd_list_events(enum lttng_domain_type domain,
- struct ltt_session *session, char *channel_name,
- struct lttng_event **events, size_t *total_size)
-{
- 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,
- total_size);
- }
- 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,
- total_size);
- }
- break;
- }
- case LTTNG_DOMAIN_LOG4J:
- case LTTNG_DOMAIN_JUL:
- case LTTNG_DOMAIN_PYTHON:
- if (session->ust_session) {
- struct lttng_ht_iter iter;
- struct agent *agt;
-
- rcu_read_lock();
- cds_lfht_for_each_entry(session->ust_session->agents->ht,
- &iter.iter, agt, node.node) {
- if (agt->domain == domain) {
- nb_event = list_lttng_agent_events(
- agt, events,
- total_size);
- break;
- }
- }
- rcu_read_unlock();
- }
- break;
- default:
- ret = LTTNG_ERR_UND;
- goto error;
- }
-
- return nb_event;
-
-error:
- /* Return negative value to differentiate return code */
- 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(sessions[i].path), session);
- } else {
- ret = snprintf(sessions[i].path, sizeof(sessions[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->active;
- sessions[i].snapshot_mode = session->snapshot_mode;
- sessions[i].live_timer_interval = session->live_timer;
- i++;
- }
-}
-
-/*
- * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
- * ready for trace analysis (or any kind of reader) or else 1 for pending data.
- */
-int cmd_data_pending(struct ltt_session *session)
-{
- int ret;
- struct ltt_kernel_session *ksess = session->kernel_session;
- struct ltt_ust_session *usess = session->ust_session;
-
- assert(session);
-
- /* Session MUST be stopped to ask for data availability. */
- if (session->active) {
- ret = LTTNG_ERR_SESSION_STARTED;
- goto error;
- } else {
- /*
- * If stopped, just make sure we've started before else the above call
- * will always send that there is data pending.
- *
- * The consumer assumes that when the data pending command is received,
- * the trace has been started before or else no output data is written
- * by the streams which is a condition for data pending. So, this is
- * *VERY* important that we don't ask the consumer before a start
- * trace.
- */
- if (!session->has_been_started) {
- ret = 0;
- goto error;
- }
- }
-
- if (ksess && ksess->consumer) {
- ret = consumer_is_data_pending(ksess->id, ksess->consumer);
- if (ret == 1) {
- /* Data is still being extracted for the kernel. */
- goto error;
- }
- }
-
- if (usess && usess->consumer) {
- ret = consumer_is_data_pending(usess->id, usess->consumer);
- if (ret == 1) {
- /* Data is still being extracted for the kernel. */
- goto error;
- }
- }
-
- /* Data is ready to be read by a viewer */
- ret = 0;
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
- *
- * Return LTTNG_OK on success or else a LTTNG_ERR code.
- */
-int cmd_snapshot_add_output(struct ltt_session *session,
- struct lttng_snapshot_output *output, uint32_t *id)
-{
- int ret;
- struct snapshot_output *new_output;
-
- assert(session);
- assert(output);
-
- DBG("Cmd snapshot add output for session %s", session->name);
-
- /*
- * Permission denied to create an output if the session is not
- * set in no output mode.
- */
- if (session->output_traces) {
- ret = LTTNG_ERR_EPERM;
- goto error;
- }
-
- /* Only one output is allowed until we have the "tee" feature. */
- if (session->snapshot.nb_output == 1) {
- ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
- goto error;
- }
-
- new_output = snapshot_output_alloc();
- if (!new_output) {
- ret = LTTNG_ERR_NOMEM;
- goto error;
- }
-
- ret = snapshot_output_init(output->max_size, output->name,
- output->ctrl_url, output->data_url, session->consumer, new_output,
- &session->snapshot);
- if (ret < 0) {
- if (ret == -ENOMEM) {
- ret = LTTNG_ERR_NOMEM;
- } else {
- ret = LTTNG_ERR_INVALID;
- }
- goto free_error;
- }
-
- rcu_read_lock();
- snapshot_add_output(&session->snapshot, new_output);
- if (id) {
- *id = new_output->id;
- }
- rcu_read_unlock();
-
- return LTTNG_OK;
-
-free_error:
- snapshot_output_destroy(new_output);
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
- *
- * Return LTTNG_OK on success or else a LTTNG_ERR code.
- */
-int cmd_snapshot_del_output(struct ltt_session *session,
- struct lttng_snapshot_output *output)
-{
- int ret;
- struct snapshot_output *sout = NULL;
-
- assert(session);
- assert(output);
-
- rcu_read_lock();
-
- /*
- * Permission denied to create an output if the session is not
- * set in no output mode.
- */
- if (session->output_traces) {
- ret = LTTNG_ERR_EPERM;
- goto error;
- }
-
- if (output->id) {
- DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
- session->name);
- sout = snapshot_find_output_by_id(output->id, &session->snapshot);
- } else if (*output->name != '\0') {
- DBG("Cmd snapshot del output name %s for session %s", output->name,
- session->name);
- sout = snapshot_find_output_by_name(output->name, &session->snapshot);
- }
- if (!sout) {
- ret = LTTNG_ERR_INVALID;
- goto error;
- }
-
- snapshot_delete_output(&session->snapshot, sout);
- snapshot_output_destroy(sout);
- ret = LTTNG_OK;
-
-error:
- rcu_read_unlock();
- return ret;
-}
-
-/*
- * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
- *
- * If no output is available, outputs is untouched and 0 is returned.
- *
- * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
- */
-ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
- struct lttng_snapshot_output **outputs)
-{
- int ret, idx = 0;
- struct lttng_snapshot_output *list = NULL;
- struct lttng_ht_iter iter;
- struct snapshot_output *output;
-
- assert(session);
- assert(outputs);
-
- DBG("Cmd snapshot list outputs for session %s", session->name);
-
- /*
- * Permission denied to create an output if the session is not
- * set in no output mode.
- */
- if (session->output_traces) {
- ret = -LTTNG_ERR_EPERM;
- goto error;
- }
-
- if (session->snapshot.nb_output == 0) {
- ret = 0;
- goto error;
- }
-
- list = zmalloc(session->snapshot.nb_output * sizeof(*list));
- if (!list) {
- ret = -LTTNG_ERR_NOMEM;
- goto error;
- }
-
- /* Copy list from session to the new list object. */
- rcu_read_lock();
- cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
- output, node.node) {
- assert(output->consumer);
- list[idx].id = output->id;
- list[idx].max_size = output->max_size;
- strncpy(list[idx].name, output->name, sizeof(list[idx].name));
- if (output->consumer->type == CONSUMER_DST_LOCAL) {
- strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
- sizeof(list[idx].ctrl_url));
- } else {
- /* Control URI. */
- ret = uri_to_str_url(&output->consumer->dst.net.control,
- list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
- if (ret < 0) {
- ret = -LTTNG_ERR_NOMEM;
- goto error;
- }
-
- /* Data URI. */
- ret = uri_to_str_url(&output->consumer->dst.net.data,
- list[idx].data_url, sizeof(list[idx].data_url));
- if (ret < 0) {
- ret = -LTTNG_ERR_NOMEM;
- goto error;
- }
- }
- idx++;
- }
-
- *outputs = list;
- list = NULL;
- ret = session->snapshot.nb_output;
-error:
- free(list);
- rcu_read_unlock();
- return ret;
-}
-
-/*
- * Send relayd sockets from snapshot output to consumer. Ignore request if the
- * snapshot output is *not* set with a remote destination.
- *
- * Return 0 on success or a LTTNG_ERR code.
- */
-static int set_relayd_for_snapshot(struct consumer_output *consumer,
- struct snapshot_output *snap_output, struct ltt_session *session)
-{
- int ret = LTTNG_OK;
- struct lttng_ht_iter iter;
- struct consumer_socket *socket;
-
- assert(consumer);
- assert(snap_output);
- assert(session);
-
- DBG2("Set relayd object from snapshot output");
-
- /* Ignore if snapshot consumer output is not network. */
- if (snap_output->consumer->type != CONSUMER_DST_NET) {
- goto error;
- }
-
- /*
- * For each consumer socket, create and send the relayd object of the
- * snapshot output.
- */
- rcu_read_lock();
- cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
- socket, node.node) {
- ret = send_consumer_relayd_sockets(0, session->id,
- snap_output->consumer, socket,
- session->name, session->hostname,
- session->live_timer);
- if (ret != LTTNG_OK) {
- rcu_read_unlock();
- goto error;
- }
- }
- rcu_read_unlock();
-
-error:
- return ret;
-}
-
-/*
- * Record a kernel snapshot.
- *
- * Return LTTNG_OK on success or a LTTNG_ERR code.
- */
-static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
- struct snapshot_output *output, struct ltt_session *session,
- int wait, uint64_t nb_packets_per_stream)
-{
- int ret;
-
- assert(ksess);
- assert(output);
- assert(session);
-
- /* Get the datetime for the snapshot output directory. */
- ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
- sizeof(output->datetime));
- if (!ret) {
- ret = LTTNG_ERR_INVALID;
- goto error;
- }
-
- /*
- * Copy kernel session sockets so we can communicate with the right
- * consumer for the snapshot record command.
- */
- ret = consumer_copy_sockets(output->consumer, ksess->consumer);
- if (ret < 0) {
- ret = LTTNG_ERR_NOMEM;
- goto error;
- }
-
- ret = set_relayd_for_snapshot(ksess->consumer, output, session);
- if (ret != LTTNG_OK) {
- goto error_snapshot;
- }
-
- ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream);
- if (ret != LTTNG_OK) {
- goto error_snapshot;
- }
-
- ret = LTTNG_OK;
- goto end;
-
-error_snapshot:
- /* Clean up copied sockets so this output can use some other later on. */
- consumer_destroy_output_sockets(output->consumer);
-error:
-end:
- return ret;
-}
-
-/*
- * Record a UST snapshot.
- *
- * Return 0 on success or a LTTNG_ERR error code.
- */
-static int record_ust_snapshot(struct ltt_ust_session *usess,
- struct snapshot_output *output, struct ltt_session *session,
- int wait, uint64_t nb_packets_per_stream)
-{
- int ret;
-
- assert(usess);
- assert(output);
- assert(session);
-
- /* Get the datetime for the snapshot output directory. */
- ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
- sizeof(output->datetime));
- if (!ret) {
- ret = LTTNG_ERR_INVALID;
- goto error;
- }
-
- /*
- * Copy UST session sockets so we can communicate with the right
- * consumer for the snapshot record command.
- */
- ret = consumer_copy_sockets(output->consumer, usess->consumer);
- if (ret < 0) {
- ret = LTTNG_ERR_NOMEM;
- goto error;
- }
-
- ret = set_relayd_for_snapshot(usess->consumer, output, session);
- if (ret != LTTNG_OK) {
- goto error_snapshot;
- }
-
- ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream);
- if (ret < 0) {
- switch (-ret) {
- case EINVAL:
- ret = LTTNG_ERR_INVALID;
- break;
- case ENODATA:
- ret = LTTNG_ERR_SNAPSHOT_NODATA;
- break;
- default:
- ret = LTTNG_ERR_SNAPSHOT_FAIL;
- break;
- }
- goto error_snapshot;
- }
-
- ret = LTTNG_OK;
-
-error_snapshot:
- /* Clean up copied sockets so this output can use some other later on. */
- consumer_destroy_output_sockets(output->consumer);
-error:
- return ret;
-}
-
-static
-uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session,
- uint64_t cur_nr_packets)
-{
- uint64_t tot_size = 0;
-
- if (session->kernel_session) {
- struct ltt_kernel_channel *chan;
- struct ltt_kernel_session *ksess = session->kernel_session;
-
- cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
- if (cur_nr_packets >= chan->channel->attr.num_subbuf) {
- /*
- * Don't take channel into account if we
- * already grab all its packets.
- */
- continue;
- }
- tot_size += chan->channel->attr.subbuf_size
- * chan->stream_count;
- }
- }
-
- if (session->ust_session) {
- struct ltt_ust_session *usess = session->ust_session;
-
- tot_size += ust_app_get_size_one_more_packet_per_stream(usess,
- cur_nr_packets);
- }
-
- return tot_size;
-}
-
-/*
- * Calculate the number of packets we can grab from each stream that
- * fits within the overall snapshot max size.
- *
- * Returns -1 on error, 0 means infinite number of packets, else > 0 is
- * the number of packets per stream.
- *
- * TODO: this approach is not perfect: we consider the worse case
- * (packet filling the sub-buffers) as an upper bound, but we could do
- * better if we do this calculation while we actually grab the packet
- * content: we would know how much padding we don't actually store into
- * the file.
- *
- * This algorithm is currently bounded by the number of packets per
- * stream.
- *
- * Since we call this algorithm before actually grabbing the data, it's
- * an approximation: for instance, applications could appear/disappear
- * in between this call and actually grabbing data.
- */
-static
-int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size)
-{
- int64_t size_left;
- uint64_t cur_nb_packets = 0;
-
- if (!max_size) {
- return 0; /* Infinite */
- }
-
- size_left = max_size;
- for (;;) {
- uint64_t one_more_packet_tot_size;
-
- one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session,
- cur_nb_packets);
- if (!one_more_packet_tot_size) {
- /* We are already grabbing all packets. */
- break;
- }
- size_left -= one_more_packet_tot_size;
- if (size_left < 0) {
- break;
- }
- cur_nb_packets++;
- }
- if (!cur_nb_packets) {
- /* Not enough room to grab one packet of each stream, error. */
- return -1;
- }
- return cur_nb_packets;
-}
-
-/*
- * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
- *
- * The wait parameter is ignored so this call always wait for the snapshot to
- * complete before returning.
- *
- * Return LTTNG_OK on success or else a LTTNG_ERR code.
- */
-int cmd_snapshot_record(struct ltt_session *session,
- struct lttng_snapshot_output *output, int wait)
-{
- int ret = LTTNG_OK;
- unsigned int use_tmp_output = 0;
- struct snapshot_output tmp_output;
- unsigned int snapshot_success = 0;
-
- assert(session);
- assert(output);
-
- DBG("Cmd snapshot record for session %s", session->name);
-
- /*
- * Permission denied to create an output if the session is not
- * set in no output mode.
- */
- if (session->output_traces) {
- ret = LTTNG_ERR_EPERM;
- goto error;
- }
-
- /* The session needs to be started at least once. */
- if (!session->has_been_started) {
- ret = LTTNG_ERR_START_SESSION_ONCE;
- goto error;
- }
-
- /* Use temporary output for the session. */
- if (*output->ctrl_url != '\0') {
- ret = snapshot_output_init(output->max_size, output->name,
- output->ctrl_url, output->data_url, session->consumer,
- &tmp_output, NULL);
- if (ret < 0) {
- if (ret == -ENOMEM) {
- ret = LTTNG_ERR_NOMEM;
- } else {
- ret = LTTNG_ERR_INVALID;
- }
- goto error;
- }
- /* Use the global session count for the temporary snapshot. */
- tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
- use_tmp_output = 1;
- }
-
- if (session->kernel_session) {
- struct ltt_kernel_session *ksess = session->kernel_session;
-
- if (use_tmp_output) {
- int64_t nb_packets_per_stream;
-
- nb_packets_per_stream = get_session_nb_packets_per_stream(session,
- tmp_output.max_size);
- if (nb_packets_per_stream < 0) {
- ret = LTTNG_ERR_MAX_SIZE_INVALID;
- goto error;
- }
- ret = record_kernel_snapshot(ksess, &tmp_output, session,
- wait, nb_packets_per_stream);
- if (ret != LTTNG_OK) {
- goto error;
- }
- snapshot_success = 1;
- } else {
- struct snapshot_output *sout;
- struct lttng_ht_iter iter;
-
- rcu_read_lock();
- cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
- &iter.iter, sout, node.node) {
- int64_t nb_packets_per_stream;
-
- /*
- * Make a local copy of the output and assign the possible
- * temporary value given by the caller.
- */
- memset(&tmp_output, 0, sizeof(tmp_output));
- memcpy(&tmp_output, sout, sizeof(tmp_output));
-
- if (output->max_size != (uint64_t) -1ULL) {
- tmp_output.max_size = output->max_size;
- }
-
- nb_packets_per_stream = get_session_nb_packets_per_stream(session,
- tmp_output.max_size);
- if (nb_packets_per_stream < 0) {
- ret = LTTNG_ERR_MAX_SIZE_INVALID;
- goto error;
- }
-
- /* Use temporary name. */
- if (*output->name != '\0') {
- strncpy(tmp_output.name, output->name,
- sizeof(tmp_output.name));
- }
-
- tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
-
- ret = record_kernel_snapshot(ksess, &tmp_output,
- session, wait, nb_packets_per_stream);
- if (ret != LTTNG_OK) {
- rcu_read_unlock();
- goto error;
- }
- snapshot_success = 1;
- }
- rcu_read_unlock();
- }
- }
-
- if (session->ust_session) {
- struct ltt_ust_session *usess = session->ust_session;
-
- if (use_tmp_output) {
- int64_t nb_packets_per_stream;
-
- nb_packets_per_stream = get_session_nb_packets_per_stream(session,
- tmp_output.max_size);
- if (nb_packets_per_stream < 0) {
- ret = LTTNG_ERR_MAX_SIZE_INVALID;
- goto error;
- }
- ret = record_ust_snapshot(usess, &tmp_output, session,
- wait, nb_packets_per_stream);
- if (ret != LTTNG_OK) {
- goto error;
- }
- snapshot_success = 1;
- } else {
- struct snapshot_output *sout;
- struct lttng_ht_iter iter;
-
- rcu_read_lock();
- cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
- &iter.iter, sout, node.node) {
- int64_t nb_packets_per_stream;
-
- /*
- * Make a local copy of the output and assign the possible
- * temporary value given by the caller.
- */
- memset(&tmp_output, 0, sizeof(tmp_output));
- memcpy(&tmp_output, sout, sizeof(tmp_output));
-
- if (output->max_size != (uint64_t) -1ULL) {
- tmp_output.max_size = output->max_size;
- }
-
- nb_packets_per_stream = get_session_nb_packets_per_stream(session,
- tmp_output.max_size);
- if (nb_packets_per_stream < 0) {
- ret = LTTNG_ERR_MAX_SIZE_INVALID;
- rcu_read_unlock();
- goto error;
- }
-
- /* Use temporary name. */
- if (*output->name != '\0') {
- strncpy(tmp_output.name, output->name,
- sizeof(tmp_output.name));
- }
-
- tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
-
- ret = record_ust_snapshot(usess, &tmp_output, session,
- wait, nb_packets_per_stream);
- if (ret != LTTNG_OK) {
- rcu_read_unlock();
- goto error;
- }
- snapshot_success = 1;
- }
- rcu_read_unlock();
- }
- }
-
- if (snapshot_success) {
- session->snapshot.nb_snapshot++;
- } else {
- ret = LTTNG_ERR_SNAPSHOT_FAIL;
- }
-
-error:
- return ret;
-}
-
-/*
- * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread.
- */
-int cmd_set_session_shm_path(struct ltt_session *session,
- const char *shm_path)
-{
- /* Safety net */
- assert(session);
-
- /*
- * Can only set shm path before session is started.
- */
- if (session->has_been_started) {
- return LTTNG_ERR_SESSION_STARTED;
- }
-
- strncpy(session->shm_path, shm_path,
- sizeof(session->shm_path));
- session->shm_path[sizeof(session->shm_path) - 1] = '\0';
-
- return 0;
-}
-
-/*
- * Init command subsystem.
- */
-void cmd_init(void)
-{
- /*
- * Set network sequence index to 1 for streams to match a relayd
- * socket on the consumer side.
- */
- pthread_mutex_lock(&relayd_net_seq_idx_lock);
- relayd_net_seq_idx = 1;
- pthread_mutex_unlock(&relayd_net_seq_idx_lock);
-
- DBG("Command subsystem initialized");
-}
projects / lttng-tools.git / blobdiff