+++ /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 as published by the Free
- * Software Foundation; only version 2 of the License.
- *
- * 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., 59 Temple
- * Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-#define _GNU_SOURCE
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <lttngerr.h>
-#include <lttng-ht.h>
-#include <lttng-share.h>
-
-#include "trace-ust.h"
-
-/*
- * Find the channel in the hashtable.
- */
-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;
-
- rcu_read_lock();
- lttng_ht_lookup(ht, (void *)name, &iter);
- node = lttng_ht_iter_get_node_str(&iter);
- if (node == NULL) {
- rcu_read_unlock();
- goto error;
- }
- rcu_read_unlock();
-
- 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.
- */
-struct ltt_ust_event *trace_ust_find_event_by_name(struct lttng_ht *ht,
- char *name)
-{
- struct lttng_ht_node_str *node;
- struct lttng_ht_iter iter;
-
- rcu_read_lock();
- lttng_ht_lookup(ht, (void *) name, &iter);
- node = lttng_ht_iter_get_node_str(&iter);
- if (node == NULL) {
- rcu_read_unlock();
- goto error;
- }
- rcu_read_unlock();
-
- DBG2("Trace UST event found by name %s", name);
-
- return caa_container_of(node, struct ltt_ust_event, node);
-
-error:
- DBG2("Trace UST event NOT found by name %s", 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(char *path, int session_id,
- struct lttng_domain *domain)
-{
- int ret;
- 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;
-
- /* Alloc UST domain hash tables */
- lus->domain_pid = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
- lus->domain_exec = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
-
- /* Alloc UST global domain channels' HT */
- lus->domain_global.channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
-
- /* Set session path */
- ret = snprintf(lus->pathname, PATH_MAX, "%s/ust", path);
- if (ret < 0) {
- PERROR("snprintf kernel traces path");
- goto error_free_session;
- }
-
- DBG2("UST trace session create successful");
-
- return lus;
-
-error_free_session:
- 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,
- char *path)
-{
- int ret;
- struct ltt_ust_channel *luc;
-
- 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 = chan->attr.output;
-
- /* Translate to UST output enum */
- switch (luc->attr.output) {
- default:
- luc->attr.output = LTTNG_UST_MMAP;
- break;
- }
-
- /* 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);
-
- /* Set trace output path */
- ret = snprintf(luc->pathname, PATH_MAX, "%s", path);
- if (ret < 0) {
- perror("asprintf ust create channel");
- goto error_free_channel;
- }
-
- DBG2("Trace UST channel %s created", luc->name);
-
- return luc;
-
-error_free_channel:
- free(luc);
-error:
- return NULL;
-}
-
-/*
- * 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 ltt_ust_event *lue;
-
- 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;
- case LTTNG_EVENT_TRACEPOINT_LOGLEVEL:
- lue->attr.instrumentation = LTTNG_UST_TRACEPOINT_LOGLEVEL;
- 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';
-
- /* Init node */
- lttng_ht_node_init_str(&lue->node, lue->attr.name);
- /* Alloc context hash tables */
- lue->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
-
- DBG2("Trace UST event %s created", lue->attr.name);
-
- 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;
-
- 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_METADATA_SUBBUF_SIZE;
- lum->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
- lum->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
- lum->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
- lum->attr.output = LTTNG_UST_MMAP;
-
- lum->handle = -1;
- /* Set metadata trace path */
- ret = snprintf(lum->pathname, PATH_MAX, "%s/metadata", 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;
-
- uctx = zmalloc(sizeof(struct ltt_ust_context));
- if (uctx == NULL) {
- PERROR("zmalloc ltt_ust_context");
- goto error;
- }
-
- uctx->ctx.ctx = ctx->ctx;
- 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;
-
- 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);
- }
- }
-
- lttng_ht_destroy(ht);
-}
-
-/*
- * Cleanup ust event structure.
- */
-void trace_ust_destroy_event(struct ltt_ust_event *event)
-{
- DBG2("Trace destroy UST event %s", event->attr.name);
- destroy_contexts(event->ctx);
-
- 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;
-
- 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);
- }
-
- lttng_ht_destroy(events);
-}
-
-/*
- * Cleanup ust channel structure.
- */
-void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
-{
- DBG2("Trace destroy UST channel %s", channel->name);
-
- rcu_read_lock();
-
- /* Destroying all events of the channel */
- destroy_events(channel->events);
- /* Destroying all context of the channel */
- destroy_contexts(channel->ctx);
-
- free(channel);
-
- rcu_read_unlock();
-}
-
-/*
- * 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);
-}
-
-/*
- * Cleanup ust metadata structure.
- */
-void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata)
-{
- 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;
-
- 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);
- }
-
- lttng_ht_destroy(channels);
-
- rcu_read_unlock();
-}
-
-/*
- * Cleanup UST pid domain.
- */
-static void destroy_domain_pid(struct lttng_ht *ht)
-{
- int ret;
- struct lttng_ht_iter iter;
- struct ltt_ust_domain_pid *dpid;
-
- cds_lfht_for_each_entry(ht->ht, &iter.iter, dpid, node.node) {
- ret = lttng_ht_del(ht , &iter);
- assert(!ret);
- destroy_channels(dpid->channels);
- }
-
- lttng_ht_destroy(ht);
-}
-
-/*
- * Cleanup UST exec name domain.
- */
-static void destroy_domain_exec(struct lttng_ht *ht)
-{
- int ret;
- struct lttng_ht_iter iter;
- struct ltt_ust_domain_exec *dexec;
-
- cds_lfht_for_each_entry(ht->ht, &iter.iter, dexec, node.node) {
- ret = lttng_ht_del(ht , &iter);
- assert(!ret);
- destroy_channels(dexec->channels);
- }
-
- lttng_ht_destroy(ht);
-}
-
-/*
- * Cleanup UST global domain.
- */
-static void destroy_domain_global(struct ltt_ust_domain_global *dom)
-{
- destroy_channels(dom->channels);
-}
-
-/*
- * Cleanup ust session structure
- */
-void trace_ust_destroy_session(struct ltt_ust_session *session)
-{
- /* Extra protection */
- if (session == NULL) {
- return;
- }
-
- rcu_read_lock();
-
- DBG2("Trace UST destroy session %d", session->id);
-
- /* Cleaning up UST domain */
- destroy_domain_global(&session->domain_global);
- destroy_domain_pid(session->domain_pid);
- destroy_domain_exec(session->domain_exec);
-
- free(session);
-
- rcu_read_unlock();
-}
projects / lttng-tools.git / blobdiff