+++ /dev/null
-/*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- *
- * 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
-#define _LGPL_SOURCE
-#include <errno.h>
-#include <urcu/list.h>
-#include <string.h>
-
-#include <lttng/lttng.h>
-#include <common/error.h>
-#include <common/sessiond-comm/sessiond-comm.h>
-
-#include "channel.h"
-#include "event.h"
-#include "kernel.h"
-#include "lttng-sessiond.h"
-#include "ust-ctl.h"
-#include "ust-app.h"
-#include "trace-kernel.h"
-#include "trace-ust.h"
-#include "agent.h"
-
-/*
- * Add unique UST event based on the event name, filter bytecode and loglevel.
- */
-static void add_unique_ust_event(struct lttng_ht *ht,
- struct ltt_ust_event *event)
-{
- struct cds_lfht_node *node_ptr;
- struct ltt_ust_ht_key key;
-
- assert(ht);
- assert(ht->ht);
- assert(event);
-
- key.name = event->attr.name;
- key.filter = (struct lttng_filter_bytecode *) event->filter;
- key.loglevel = event->attr.loglevel;
- key.exclusion = event->exclusion;
-
- node_ptr = cds_lfht_add_unique(ht->ht,
- ht->hash_fct(event->node.key, lttng_ht_seed),
- trace_ust_ht_match_event, &key, &event->node.node);
- assert(node_ptr == &event->node.node);
-}
-
-/*
- * Disable kernel tracepoint event for a channel from the kernel session.
- */
-int event_kernel_disable_event(struct ltt_kernel_channel *kchan,
- char *event_name)
-{
- int ret;
- struct ltt_kernel_event *kevent;
-
- assert(kchan);
-
- kevent = trace_kernel_get_event_by_name(event_name, kchan,
- LTTNG_EVENT_ALL);
- if (kevent == NULL) {
- ret = LTTNG_ERR_NO_EVENT;
- goto error;
- }
-
- ret = kernel_disable_event(kevent);
- if (ret < 0) {
- ret = LTTNG_ERR_KERN_DISABLE_FAIL;
- goto error;
- }
-
- DBG("Kernel event %s disable for channel %s.",
- kevent->event->name, kchan->channel->name);
-
- ret = LTTNG_OK;
-
-error:
- return ret;
-}
-
-/*
- * Disable kernel tracepoint events for a channel from the kernel session.
- */
-int event_kernel_disable_event_type(struct ltt_kernel_channel *kchan,
- enum lttng_event_type type)
-{
- int ret;
- struct ltt_kernel_event *kevent;
-
- assert(kchan);
-
- /* For each event in the kernel session */
- cds_list_for_each_entry(kevent, &kchan->events_list.head, list) {
- if (type != LTTNG_EVENT_ALL && kevent->type != type)
- continue;
- ret = kernel_disable_event(kevent);
- if (ret < 0) {
- /* We continue disabling the rest */
- continue;
- }
- }
- ret = LTTNG_OK;
- return ret;
-}
-
-/*
- * Disable all kernel event for a channel from the kernel session.
- */
-int event_kernel_disable_event_all(struct ltt_kernel_channel *kchan)
-{
- return event_kernel_disable_event_type(kchan, LTTNG_EVENT_ALL);
-}
-
-/*
- * Enable kernel tracepoint event for a channel from the kernel session.
- * We own filter_expression and filter.
- */
-int event_kernel_enable_event(struct ltt_kernel_channel *kchan,
- struct lttng_event *event, char *filter_expression,
- struct lttng_filter_bytecode *filter)
-{
- int ret;
- struct ltt_kernel_event *kevent;
-
- assert(kchan);
- assert(event);
-
- kevent = trace_kernel_find_event(event->name, kchan,
- event->type, filter);
- if (kevent == NULL) {
- ret = kernel_create_event(event, kchan,
- filter_expression, filter);
- /* We have passed ownership */
- filter_expression = NULL;
- filter = NULL;
- if (ret < 0) {
- switch (-ret) {
- case EEXIST:
- ret = LTTNG_ERR_KERN_EVENT_EXIST;
- break;
- case ENOSYS:
- ret = LTTNG_ERR_KERN_EVENT_ENOSYS;
- break;
- default:
- ret = LTTNG_ERR_KERN_ENABLE_FAIL;
- break;
- }
- goto end;
- }
- } else if (kevent->enabled == 0) {
- ret = kernel_enable_event(kevent);
- if (ret < 0) {
- ret = LTTNG_ERR_KERN_ENABLE_FAIL;
- goto end;
- }
- } else {
- /* At this point, the event is considered enabled */
- ret = LTTNG_ERR_KERN_EVENT_EXIST;
- goto end;
- }
-
- ret = LTTNG_OK;
-end:
- free(filter_expression);
- free(filter);
- return ret;
-}
-
-/*
- * ============================
- * UST : The Ultimate Frontier!
- * ============================
- */
-
-/*
- * Enable UST tracepoint event for a channel from a UST session.
- * We own filter_expression, filter, and exclusion.
- */
-int event_ust_enable_tracepoint(struct ltt_ust_session *usess,
- struct ltt_ust_channel *uchan, struct lttng_event *event,
- char *filter_expression,
- struct lttng_filter_bytecode *filter,
- struct lttng_event_exclusion *exclusion,
- bool internal_event)
-{
- int ret = LTTNG_OK, to_create = 0;
- struct ltt_ust_event *uevent;
-
- assert(usess);
- assert(uchan);
- assert(event);
-
- rcu_read_lock();
-
- uevent = trace_ust_find_event(uchan->events, event->name, filter,
- event->loglevel, exclusion);
- if (!uevent) {
- uevent = trace_ust_create_event(event, filter_expression,
- filter, exclusion, internal_event);
- /* We have passed ownership */
- filter_expression = NULL;
- filter = NULL;
- exclusion = NULL;
- if (uevent == NULL) {
- ret = LTTNG_ERR_UST_ENABLE_FAIL;
- goto error;
- }
-
- /* Valid to set it after the goto error since uevent is still NULL */
- to_create = 1;
- }
-
- if (uevent->enabled) {
- /* It's already enabled so everything is OK */
- ret = LTTNG_ERR_UST_EVENT_ENABLED;
- goto end;
- }
-
- uevent->enabled = 1;
-
- if (to_create) {
- /* Create event on all UST registered apps for session */
- ret = ust_app_create_event_glb(usess, uchan, uevent);
- } else {
- /* Enable event on all UST registered apps for session */
- ret = ust_app_enable_event_glb(usess, uchan, uevent);
- }
-
- if (ret < 0) {
- if (ret == -LTTNG_UST_ERR_EXIST) {
- ret = LTTNG_ERR_UST_EVENT_EXIST;
- goto end;
- } else {
- ret = LTTNG_ERR_UST_ENABLE_FAIL;
- goto error;
- }
- }
-
- if (to_create) {
- /* Add ltt ust event to channel */
- add_unique_ust_event(uchan->events, uevent);
- }
-
- DBG("Event UST %s %s in channel %s", uevent->attr.name,
- to_create ? "created" : "enabled", uchan->name);
-
- ret = LTTNG_OK;
-
-end:
- rcu_read_unlock();
- free(filter_expression);
- free(filter);
- free(exclusion);
- return ret;
-
-error:
- /*
- * Only destroy event on creation time (not enabling time) because if the
- * event is found in the channel (to_create == 0), it means that at some
- * point the enable_event worked and it's thus valid to keep it alive.
- * Destroying it also implies that we also destroy it's shadow copy to sync
- * everyone up.
- */
- if (to_create) {
- /* In this code path, the uevent was not added to the hash table */
- trace_ust_destroy_event(uevent);
- }
- rcu_read_unlock();
- free(filter_expression);
- free(filter);
- free(exclusion);
- return ret;
-}
-
-/*
- * Disable UST tracepoint of a channel from a UST session.
- */
-int event_ust_disable_tracepoint(struct ltt_ust_session *usess,
- struct ltt_ust_channel *uchan, char *event_name)
-{
- int ret;
- struct ltt_ust_event *uevent;
- struct lttng_ht_node_str *node;
- struct lttng_ht_iter iter;
- struct lttng_ht *ht;
-
- assert(usess);
- assert(uchan);
- assert(event_name);
-
- ht = uchan->events;
-
- rcu_read_lock();
-
- /*
- * We use a custom lookup since we need the iterator for the next_duplicate
- * call in the do while loop below.
- */
- cds_lfht_lookup(ht->ht, ht->hash_fct((void *) event_name, lttng_ht_seed),
- trace_ust_ht_match_event_by_name, event_name, &iter.iter);
- node = lttng_ht_iter_get_node_str(&iter);
- if (node == NULL) {
- DBG2("Trace UST event NOT found by name %s", event_name);
- ret = LTTNG_ERR_UST_EVENT_NOT_FOUND;
- goto error;
- }
-
- do {
- uevent = caa_container_of(node, struct ltt_ust_event, node);
- assert(uevent);
-
- if (uevent->enabled == 0) {
- /* It's already disabled so everything is OK */
- goto next;
- }
-
- ret = ust_app_disable_event_glb(usess, uchan, uevent);
- if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) {
- ret = LTTNG_ERR_UST_DISABLE_FAIL;
- goto error;
- }
- uevent->enabled = 0;
-
- DBG2("Event UST %s disabled in channel %s", uevent->attr.name,
- uchan->name);
-
-next:
- /* Get next duplicate event by name. */
- cds_lfht_next_duplicate(ht->ht, trace_ust_ht_match_event_by_name,
- event_name, &iter.iter);
- node = lttng_ht_iter_get_node_str(&iter);
- } while (node);
-
- ret = LTTNG_OK;
-
-error:
- rcu_read_unlock();
- return ret;
-}
-
-/*
- * Enable all agent event for a given UST session.
- *
- * Return LTTNG_OK on success or else a LTTNG_ERR* code.
- */
-int event_agent_enable_all(struct ltt_ust_session *usess,
- struct agent *agt, struct lttng_event *event,
- struct lttng_filter_bytecode *filter ,char *filter_expression)
-{
- int ret;
- struct agent_event *aevent;
- struct lttng_ht_iter iter;
-
- assert(usess);
-
- DBG("Event agent enabling ALL events for session %" PRIu64, usess->id);
-
- /* Enable event on agent application through TCP socket. */
- ret = event_agent_enable(usess, agt, event, filter, filter_expression);
- if (ret != LTTNG_OK) {
- goto error;
- }
-
- /* Flag every event that they are now enabled. */
- rcu_read_lock();
- cds_lfht_for_each_entry(agt->events->ht, &iter.iter, aevent,
- node.node) {
- aevent->enabled = 1;
- }
- rcu_read_unlock();
-
- ret = LTTNG_OK;
-
-error:
- return ret;
-}
-
-/*
- * Enable a single agent event for a given UST session.
- *
- * Return LTTNG_OK on success or else a LTTNG_ERR* code.
- */
-int event_agent_enable(struct ltt_ust_session *usess,
- struct agent *agt, struct lttng_event *event,
- struct lttng_filter_bytecode *filter,
- char *filter_expression)
-{
- int ret, created = 0;
- struct agent_event *aevent;
-
- assert(usess);
- assert(event);
- assert(agt);
-
- DBG("Event agent enabling %s for session %" PRIu64 " with loglevel type %d "
- ", loglevel %d and filter \"%s\"", event->name,
- usess->id, event->loglevel_type, event->loglevel,
- filter_expression ? filter_expression : "NULL");
-
- aevent = agent_find_event(event->name, event->loglevel, agt);
- if (!aevent) {
- aevent = agent_create_event(event->name, event->loglevel,
- event->loglevel_type, filter,
- filter_expression);
- if (!aevent) {
- ret = LTTNG_ERR_NOMEM;
- goto error;
- }
- created = 1;
- }
-
- /* Already enabled? */
- if (aevent->enabled) {
- goto end;
- }
-
- ret = agent_enable_event(aevent, agt->domain);
- if (ret != LTTNG_OK) {
- goto error;
- }
-
- /* If the event was created prior to the enable, add it to the domain. */
- if (created) {
- agent_add_event(aevent, agt);
- }
-
-end:
- return LTTNG_OK;
-
-error:
- if (created) {
- agent_destroy_event(aevent);
- }
- return ret;
-}
-
-/*
- * Return the default event name associated with the provided UST domain. Return
- * NULL on error.
- */
-const char *event_get_default_agent_ust_name(enum lttng_domain_type domain)
-{
- const char *default_event_name = NULL;
-
- switch (domain) {
- case LTTNG_DOMAIN_LOG4J:
- default_event_name = DEFAULT_LOG4J_EVENT_NAME;
- break;
- case LTTNG_DOMAIN_JUL:
- default_event_name = DEFAULT_JUL_EVENT_NAME;
- break;
- case LTTNG_DOMAIN_PYTHON:
- default_event_name = DEFAULT_PYTHON_EVENT_NAME;
- break;
- default:
- assert(0);
- }
-
- return default_event_name;
-}
-
-/*
- * Disable a single agent event for a given UST session.
- *
- * Return LTTNG_OK on success or else a LTTNG_ERR* code.
- */
-int event_agent_disable(struct ltt_ust_session *usess, struct agent *agt,
- char *event_name)
-{
- int ret;
- struct agent_event *aevent;
- struct ltt_ust_event *uevent = NULL;
- struct ltt_ust_channel *uchan = NULL;
- const char *ust_event_name, *ust_channel_name;
-
- assert(agt);
- assert(usess);
- assert(event_name);
-
- DBG("Event agent disabling %s for session %" PRIu64, event_name, usess->id);
-
- aevent = agent_find_event_by_name(event_name, agt);
- if (!aevent) {
- ret = LTTNG_ERR_UST_EVENT_NOT_FOUND;
- goto error;
- }
-
- /* Already disabled? */
- if (!aevent->enabled) {
- goto end;
- }
-
- if (agt->domain == LTTNG_DOMAIN_JUL) {
- ust_channel_name = DEFAULT_JUL_CHANNEL_NAME;
- } else if (agt->domain == LTTNG_DOMAIN_LOG4J) {
- ust_channel_name = DEFAULT_LOG4J_CHANNEL_NAME;
- } else if (agt->domain == LTTNG_DOMAIN_PYTHON) {
- ust_channel_name = DEFAULT_PYTHON_CHANNEL_NAME;
- } else {
- ret = LTTNG_ERR_INVALID;
- goto error;
- }
-
- /*
- * Disable it on the UST side. First get the channel reference then find
- * the event and finally disable it.
- */
- uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
- (char *) ust_channel_name);
- if (!uchan) {
- ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
- goto error;
- }
-
- ust_event_name = event_get_default_agent_ust_name(agt->domain);
- if (!ust_event_name) {
- ret = LTTNG_ERR_FATAL;
- goto error;
- }
-
- /*
- * The loglevel is hardcoded with 0 here since the agent ust event is set
- * with the loglevel type to ALL thus the loglevel stays 0. The event's
- * filter is the one handling the loglevel for agent.
- */
- uevent = trace_ust_find_event(uchan->events, (char *) ust_event_name,
- aevent->filter, 0, NULL);
- /* If the agent event exists, it must be available on the UST side. */
- assert(uevent);
-
- ret = ust_app_disable_event_glb(usess, uchan, uevent);
- if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) {
- ret = LTTNG_ERR_UST_DISABLE_FAIL;
- goto error;
- }
-
- /*
- * Flag event that it's disabled so the shadow copy on the ust app side
- * will disable it if an application shows up.
- */
- uevent->enabled = 0;
-
- ret = agent_disable_event(aevent, agt->domain);
- if (ret != LTTNG_OK) {
- goto error;
- }
-
-end:
- return LTTNG_OK;
-
-error:
- return ret;
-}
-/*
- * Disable all agent event for a given UST session.
- *
- * Return LTTNG_OK on success or else a LTTNG_ERR* code.
- */
-int event_agent_disable_all(struct ltt_ust_session *usess,
- struct agent *agt)
-{
- int ret;
- struct agent_event *aevent;
- struct lttng_ht_iter iter;
-
- assert(agt);
- assert(usess);
-
- /*
- * Disable event on agent application. Continue to disable all other events
- * if the * event is not found.
- */
- ret = event_agent_disable(usess, agt, "*");
- if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_NOT_FOUND) {
- goto error;
- }
-
- /* Flag every event that they are now enabled. */
- rcu_read_lock();
- cds_lfht_for_each_entry(agt->events->ht, &iter.iter, aevent,
- node.node) {
- if (!aevent->enabled) {
- continue;
- }
-
- ret = event_agent_disable(usess, agt, aevent->name);
- if (ret != LTTNG_OK) {
- rcu_read_unlock();
- goto error;
- }
- }
- rcu_read_unlock();
-
- ret = LTTNG_OK;
-
-error:
- return ret;
-}
projects / lttng-tools.git / blobdiff