+++ /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
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <inttypes.h>
-
-#include <common/common.h>
-#include <common/defaults.h>
-
-#include "buffer-registry.h"
-#include "trace-ust.h"
-#include "utils.h"
-
-/*
- * Match function for the events hash table lookup.
- *
- * Matches by name only. Used by the disable command.
- */
-int trace_ust_ht_match_event_by_name(struct cds_lfht_node *node,
- const void *_key)
-{
- struct ltt_ust_event *event;
- const char *name;
-
- assert(node);
- assert(_key);
-
- event = caa_container_of(node, struct ltt_ust_event, node.node);
- name = _key;
-
- /* Event name */
- if (strncmp(event->attr.name, name, sizeof(event->attr.name)) != 0) {
- goto no_match;
- }
-
- /* Match */
- return 1;
-
-no_match:
- return 0;
-}
-
-/*
- * Match function for the hash table lookup.
- *
- * It matches an ust event based on three attributes which are the event name,
- * the filter bytecode and the loglevel.
- */
-int trace_ust_ht_match_event(struct cds_lfht_node *node, const void *_key)
-{
- struct ltt_ust_event *event;
- const struct ltt_ust_ht_key *key;
-
- assert(node);
- assert(_key);
-
- event = caa_container_of(node, struct ltt_ust_event, node.node);
- key = _key;
-
- /* Match the 3 elements of the key: name, filter and loglevel. */
-
- /* Event name */
- if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
- goto no_match;
- }
-
- /* Event loglevel. */
- if (event->attr.loglevel != key->loglevel) {
- if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL
- && key->loglevel == 0 && event->attr.loglevel == -1) {
- /*
- * Match is accepted. This is because on event creation, the
- * loglevel is set to -1 if the event loglevel type is ALL so 0 and
- * -1 are accepted for this loglevel type since 0 is the one set by
- * the API when receiving an enable event.
- */
- } else {
- goto no_match;
- }
- }
-
- /* Only one of the filters is NULL, fail. */
- if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
- goto no_match;
- }
-
- if (key->filter && event->filter) {
- /* Both filters exists, check length followed by the bytecode. */
- if (event->filter->len != key->filter->len ||
- memcmp(event->filter->data, key->filter->data,
- event->filter->len) != 0) {
- goto no_match;
- }
- }
-
- /* Match. */
- return 1;
-
-no_match:
- return 0;
-}
-
-/*
- * Find the channel in the hashtable and return channel pointer. RCU read side
- * lock MUST be acquired before calling this.
- */
-struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht,
- char *name)
-{
- struct lttng_ht_node_str *node;
- struct lttng_ht_iter iter;
-
- /*
- * If we receive an empty string for channel name, it means the
- * default channel name is requested.
- */
- if (name[0] == '\0')
- name = DEFAULT_CHANNEL_NAME;
-
- lttng_ht_lookup(ht, (void *)name, &iter);
- node = lttng_ht_iter_get_node_str(&iter);
- if (node == NULL) {
- goto error;
- }
-
- DBG2("Trace UST channel %s found by name", name);
-
- return caa_container_of(node, struct ltt_ust_channel, node);
-
-error:
- DBG2("Trace UST channel %s not found by name", name);
- return NULL;
-}
-
-/*
- * Find the event in the hashtable and return event pointer. RCU read side lock
- * MUST be acquired before calling this.
- */
-struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht,
- char *name, struct lttng_filter_bytecode *filter, int loglevel)
-{
- struct lttng_ht_node_str *node;
- struct lttng_ht_iter iter;
- struct ltt_ust_ht_key key;
-
- assert(name);
- assert(ht);
-
- key.name = name;
- key.filter = filter;
- key.loglevel = loglevel;
-
- cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
- trace_ust_ht_match_event, &key, &iter.iter);
- node = lttng_ht_iter_get_node_str(&iter);
- if (node == NULL) {
- goto error;
- }
-
- DBG2("Trace UST event %s found", key.name);
-
- return caa_container_of(node, struct ltt_ust_event, node);
-
-error:
- DBG2("Trace UST event %s NOT found", key.name);
- return NULL;
-}
-
-/*
- * Allocate and initialize a ust session data structure.
- *
- * Return pointer to structure or NULL.
- */
-struct ltt_ust_session *trace_ust_create_session(uint64_t session_id)
-{
- struct ltt_ust_session *lus;
-
- /* Allocate a new ltt ust session */
- lus = zmalloc(sizeof(struct ltt_ust_session));
- if (lus == NULL) {
- PERROR("create ust session zmalloc");
- goto error;
- }
-
- /* Init data structure */
- lus->id = session_id;
- lus->start_trace = 0;
-
- /*
- * Default buffer type. This can be changed through an enable channel
- * requesting a different type. Note that this can only be changed once
- * during the session lifetime which is at the first enable channel and
- * only before start. The flag buffer_type_changed indicates the status.
- */
- lus->buffer_type = LTTNG_BUFFER_PER_UID;
- /* Once set to 1, the buffer_type is immutable for the session. */
- lus->buffer_type_changed = 0;
- /* Init it in case it get used after allocation. */
- CDS_INIT_LIST_HEAD(&lus->buffer_reg_uid_list);
-
- /* Alloc UST global domain channels' HT */
- lus->domain_global.channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
-
- lus->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
- if (lus->consumer == NULL) {
- goto error_consumer;
- }
-
- /*
- * The tmp_consumer stays NULL until a set_consumer_uri command is
- * executed. At this point, the consumer should be nullify until an
- * enable_consumer command. This assignment is symbolic since we've zmalloc
- * the struct.
- */
- lus->tmp_consumer = NULL;
-
- DBG2("UST trace session create successful");
-
- return lus;
-
-error_consumer:
- ht_cleanup_push(lus->domain_global.channels);
- free(lus);
-error:
- return NULL;
-}
-
-/*
- * Allocate and initialize a ust channel data structure.
- *
- * Return pointer to structure or NULL.
- */
-struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan)
-{
- struct ltt_ust_channel *luc;
-
- assert(chan);
-
- luc = zmalloc(sizeof(struct ltt_ust_channel));
- if (luc == NULL) {
- PERROR("ltt_ust_channel zmalloc");
- goto error;
- }
-
- /* Copy UST channel attributes */
- luc->attr.overwrite = chan->attr.overwrite;
- luc->attr.subbuf_size = chan->attr.subbuf_size;
- luc->attr.num_subbuf = chan->attr.num_subbuf;
- luc->attr.switch_timer_interval = chan->attr.switch_timer_interval;
- luc->attr.read_timer_interval = chan->attr.read_timer_interval;
- luc->attr.output = (enum lttng_ust_output) chan->attr.output;
-
- /* Translate to UST output enum */
- switch (luc->attr.output) {
- default:
- luc->attr.output = LTTNG_UST_MMAP;
- break;
- }
-
- /*
- * If we receive an empty string for channel name, it means the
- * default channel name is requested.
- */
- if (chan->name[0] == '\0') {
- strncpy(luc->name, DEFAULT_CHANNEL_NAME, sizeof(luc->name));
- } else {
- /* Copy channel name */
- strncpy(luc->name, chan->name, sizeof(luc->name));
- }
- luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
-
- /* Init node */
- lttng_ht_node_init_str(&luc->node, luc->name);
- /* Alloc hash tables */
- luc->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
- luc->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
-
- /* On-disk circular buffer parameters */
- luc->tracefile_size = chan->attr.tracefile_size;
- luc->tracefile_count = chan->attr.tracefile_count;
-
- DBG2("Trace UST channel %s created", luc->name);
-
-error:
- return luc;
-}
-
-/*
- * Allocate and initialize a ust event. Set name and event type.
- *
- * Return pointer to structure or NULL.
- */
-struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev,
- struct lttng_filter_bytecode *filter)
-{
- struct ltt_ust_event *lue;
-
- assert(ev);
-
- lue = zmalloc(sizeof(struct ltt_ust_event));
- if (lue == NULL) {
- PERROR("ust event zmalloc");
- goto error;
- }
-
- switch (ev->type) {
- case LTTNG_EVENT_PROBE:
- lue->attr.instrumentation = LTTNG_UST_PROBE;
- break;
- case LTTNG_EVENT_FUNCTION:
- lue->attr.instrumentation = LTTNG_UST_FUNCTION;
- break;
- case LTTNG_EVENT_FUNCTION_ENTRY:
- lue->attr.instrumentation = LTTNG_UST_FUNCTION;
- break;
- case LTTNG_EVENT_TRACEPOINT:
- lue->attr.instrumentation = LTTNG_UST_TRACEPOINT;
- break;
- default:
- ERR("Unknown ust instrumentation type (%d)", ev->type);
- goto error_free_event;
- }
-
- /* Copy event name */
- strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN);
- lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
-
- switch (ev->loglevel_type) {
- case LTTNG_EVENT_LOGLEVEL_ALL:
- lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_ALL;
- lue->attr.loglevel = -1; /* Force to -1 */
- break;
- case LTTNG_EVENT_LOGLEVEL_RANGE:
- lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_RANGE;
- lue->attr.loglevel = ev->loglevel;
- break;
- case LTTNG_EVENT_LOGLEVEL_SINGLE:
- lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_SINGLE;
- lue->attr.loglevel = ev->loglevel;
- break;
- default:
- ERR("Unknown ust loglevel type (%d)", ev->loglevel_type);
- goto error_free_event;
- }
-
- /* Same layout. */
- lue->filter = (struct lttng_ust_filter_bytecode *) filter;
-
- /* Init node */
- lttng_ht_node_init_str(&lue->node, lue->attr.name);
-
- DBG2("Trace UST event %s, loglevel (%d,%d) created",
- lue->attr.name, lue->attr.loglevel_type,
- lue->attr.loglevel);
-
- return lue;
-
-error_free_event:
- free(lue);
-error:
- return NULL;
-}
-
-/*
- * Allocate and initialize a ust metadata.
- *
- * Return pointer to structure or NULL.
- */
-struct ltt_ust_metadata *trace_ust_create_metadata(char *path)
-{
- int ret;
- struct ltt_ust_metadata *lum;
-
- assert(path);
-
- lum = zmalloc(sizeof(struct ltt_ust_metadata));
- if (lum == NULL) {
- PERROR("ust metadata zmalloc");
- goto error;
- }
-
- /* Set default attributes */
- lum->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
- lum->attr.subbuf_size = default_get_metadata_subbuf_size();
- lum->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
- lum->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER;
- lum->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER;
- lum->attr.output = LTTNG_UST_MMAP;
-
- lum->handle = -1;
- /* Set metadata trace path */
- ret = snprintf(lum->pathname, PATH_MAX, "%s/" DEFAULT_METADATA_NAME, path);
- if (ret < 0) {
- PERROR("asprintf ust metadata");
- goto error_free_metadata;
- }
-
- return lum;
-
-error_free_metadata:
- free(lum);
-error:
- return NULL;
-}
-
-/*
- * Allocate and initialize an UST context.
- *
- * Return pointer to structure or NULL.
- */
-struct ltt_ust_context *trace_ust_create_context(
- struct lttng_event_context *ctx)
-{
- struct ltt_ust_context *uctx;
- enum lttng_ust_context_type utype;
-
- assert(ctx);
-
- switch (ctx->ctx) {
- case LTTNG_EVENT_CONTEXT_VTID:
- utype = LTTNG_UST_CONTEXT_VTID;
- break;
- case LTTNG_EVENT_CONTEXT_VPID:
- utype = LTTNG_UST_CONTEXT_VPID;
- break;
- case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
- utype = LTTNG_UST_CONTEXT_PTHREAD_ID;
- break;
- case LTTNG_EVENT_CONTEXT_PROCNAME:
- utype = LTTNG_UST_CONTEXT_PROCNAME;
- break;
- case LTTNG_EVENT_CONTEXT_IP:
- utype = LTTNG_UST_CONTEXT_IP;
- break;
- default:
- ERR("Invalid UST context");
- return NULL;
- }
-
- uctx = zmalloc(sizeof(struct ltt_ust_context));
- if (uctx == NULL) {
- PERROR("zmalloc ltt_ust_context");
- goto error;
- }
-
- uctx->ctx.ctx = utype;
- lttng_ht_node_init_ulong(&uctx->node, (unsigned long) uctx->ctx.ctx);
-
- return uctx;
-
-error:
- return NULL;
-}
-
-/*
- * RCU safe free context structure.
- */
-static void destroy_context_rcu(struct rcu_head *head)
-{
- struct lttng_ht_node_ulong *node =
- caa_container_of(head, struct lttng_ht_node_ulong, head);
- struct ltt_ust_context *ctx =
- caa_container_of(node, struct ltt_ust_context, node);
-
- free(ctx);
-}
-
-/*
- * Cleanup UST context hash table.
- */
-static void destroy_contexts(struct lttng_ht *ht)
-{
- int ret;
- struct lttng_ht_node_ulong *node;
- struct lttng_ht_iter iter;
-
- assert(ht);
-
- rcu_read_lock();
- cds_lfht_for_each_entry(ht->ht, &iter.iter, node, node) {
- ret = lttng_ht_del(ht, &iter);
- if (!ret) {
- call_rcu(&node->head, destroy_context_rcu);
- }
- }
- rcu_read_unlock();
-
- ht_cleanup_push(ht);
-}
-
-/*
- * Cleanup ust event structure.
- */
-void trace_ust_destroy_event(struct ltt_ust_event *event)
-{
- assert(event);
-
- DBG2("Trace destroy UST event %s", event->attr.name);
- free(event->filter);
- free(event);
-}
-
-/*
- * URCU intermediate call to complete destroy event.
- */
-static void destroy_event_rcu(struct rcu_head *head)
-{
- struct lttng_ht_node_str *node =
- caa_container_of(head, struct lttng_ht_node_str, head);
- struct ltt_ust_event *event =
- caa_container_of(node, struct ltt_ust_event, node);
-
- trace_ust_destroy_event(event);
-}
-
-/*
- * Cleanup UST events hashtable.
- */
-static void destroy_events(struct lttng_ht *events)
-{
- int ret;
- struct lttng_ht_node_str *node;
- struct lttng_ht_iter iter;
-
- assert(events);
-
- rcu_read_lock();
- cds_lfht_for_each_entry(events->ht, &iter.iter, node, node) {
- ret = lttng_ht_del(events, &iter);
- assert(!ret);
- call_rcu(&node->head, destroy_event_rcu);
- }
- rcu_read_unlock();
-
- ht_cleanup_push(events);
-}
-
-/*
- * Cleanup ust channel structure.
- *
- * Should _NOT_ be called with RCU read lock held.
- */
-static void _trace_ust_destroy_channel(struct ltt_ust_channel *channel)
-{
- assert(channel);
-
- DBG2("Trace destroy UST channel %s", channel->name);
-
- /* Destroying all events of the channel */
- destroy_events(channel->events);
- /* Destroying all context of the channel */
- destroy_contexts(channel->ctx);
-
- free(channel);
-}
-
-/*
- * URCU intermediate call to complete destroy channel.
- */
-static void destroy_channel_rcu(struct rcu_head *head)
-{
- struct lttng_ht_node_str *node =
- caa_container_of(head, struct lttng_ht_node_str, head);
- struct ltt_ust_channel *channel =
- caa_container_of(node, struct ltt_ust_channel, node);
-
- _trace_ust_destroy_channel(channel);
-}
-
-void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
-{
- call_rcu(&channel->node.head, destroy_channel_rcu);
-}
-
-/*
- * Remove an UST channel from a channel HT.
- */
-void trace_ust_delete_channel(struct lttng_ht *ht,
- struct ltt_ust_channel *channel)
-{
- int ret;
- struct lttng_ht_iter iter;
-
- assert(ht);
- assert(channel);
-
- iter.iter.node = &channel->node.node;
- ret = lttng_ht_del(ht, &iter);
- assert(!ret);
-}
-
-/*
- * Cleanup ust metadata structure.
- */
-void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata)
-{
- assert(metadata);
-
- if (!metadata->handle) {
- return;
- }
- DBG2("Trace UST destroy metadata %d", metadata->handle);
- free(metadata);
-}
-
-/*
- * Iterate over a hash table containing channels and cleanup safely.
- */
-static void destroy_channels(struct lttng_ht *channels)
-{
- int ret;
- struct lttng_ht_node_str *node;
- struct lttng_ht_iter iter;
-
- assert(channels);
-
- rcu_read_lock();
-
- cds_lfht_for_each_entry(channels->ht, &iter.iter, node, node) {
- ret = lttng_ht_del(channels, &iter);
- assert(!ret);
- call_rcu(&node->head, destroy_channel_rcu);
- }
- rcu_read_unlock();
-
- ht_cleanup_push(channels);
-}
-
-/*
- * Cleanup UST global domain.
- */
-static void destroy_domain_global(struct ltt_ust_domain_global *dom)
-{
- assert(dom);
-
- destroy_channels(dom->channels);
-}
-
-/*
- * Cleanup ust session structure
- *
- * Should *NOT* be called with RCU read-side lock held.
- */
-void trace_ust_destroy_session(struct ltt_ust_session *session)
-{
- struct buffer_reg_uid *reg, *sreg;
-
- assert(session);
-
- DBG2("Trace UST destroy session %" PRIu64, session->id);
-
- /* Cleaning up UST domain */
- destroy_domain_global(&session->domain_global);
-
- /* Cleanup UID buffer registry object(s). */
- cds_list_for_each_entry_safe(reg, sreg, &session->buffer_reg_uid_list,
- lnode) {
- cds_list_del(®->lnode);
- buffer_reg_uid_remove(reg);
- buffer_reg_uid_destroy(reg, session->consumer);
- }
-
- consumer_destroy_output(session->consumer);
- consumer_destroy_output(session->tmp_consumer);
-
- free(session);
-}
projects / lttng-tools.git / blobdiff