* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#define _GNU_SOURCE
+#define _LGPL_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"
+#include "ust-app.h"
+#include "agent.h"
/*
* Match function for the events hash table lookup.
{
struct ltt_ust_event *event;
const struct ltt_ust_ht_key *key;
+ int ev_loglevel_value;
+ int ll_match;
assert(node);
assert(_key);
event = caa_container_of(node, struct ltt_ust_event, node.node);
key = _key;
+ ev_loglevel_value = event->attr.loglevel;
- /* Match the 3 elements of the key: name, filter and loglevel. */
+ /* Match the 4 elements of the key: name, filter, loglevel, exclusions. */
/* 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;
- }
+ /* Event loglevel value and type. */
+ ll_match = loglevels_match(event->attr.loglevel_type,
+ ev_loglevel_value, key->loglevel_type,
+ key->loglevel_value, LTTNG_UST_LOGLEVEL_ALL);
+
+ if (!ll_match) {
+ goto no_match;
}
/* Only one of the filters is NULL, fail. */
}
}
+ /* If only one of the exclusions is NULL, fail. */
+ if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) {
+ goto no_match;
+ }
+
+ if (key->exclusion && event->exclusion) {
+ size_t i;
+
+ /* Check exclusion counts first. */
+ if (event->exclusion->count != key->exclusion->count) {
+ goto no_match;
+ }
+
+ /* Compare names individually. */
+ for (i = 0; i < event->exclusion->count; ++i) {
+ size_t j;
+ bool found = false;
+ const char *name_ev =
+ LTTNG_EVENT_EXCLUSION_NAME_AT(
+ event->exclusion, i);
+
+ /*
+ * Compare this exclusion name to all the key's
+ * exclusion names.
+ */
+ for (j = 0; j < key->exclusion->count; ++j) {
+ const char *name_key =
+ LTTNG_EVENT_EXCLUSION_NAME_AT(
+ key->exclusion, j);
+
+ if (!strncmp(name_ev, name_key,
+ LTTNG_SYMBOL_NAME_LEN)) {
+ /* Names match! */
+ found = true;
+ break;
+ }
+ }
+
+ /*
+ * If the current exclusion name was not found amongst
+ * the key's exclusion names, then there's no match.
+ */
+ if (!found) {
+ goto no_match;
+ }
+ }
+ }
/* Match. */
return 1;
}
/*
- * Find the channel in the hashtable.
+ * 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;
- rcu_read_lock();
+ /*
+ * 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) {
- rcu_read_unlock();
goto error;
}
- rcu_read_unlock();
DBG2("Trace UST channel %s found by name", name);
}
/*
- * Find the event in the hashtable.
+ * 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)
+ char *name, struct lttng_filter_bytecode *filter,
+ enum lttng_ust_loglevel_type loglevel_type, int loglevel_value,
+ struct lttng_event_exclusion *exclusion)
{
struct lttng_ht_node_str *node;
struct lttng_ht_iter iter;
key.name = name;
key.filter = filter;
- key.loglevel = loglevel;
+ key.loglevel_type = loglevel_type;
+ key.loglevel_value = loglevel_value;
+ key.exclusion = exclusion;
cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
trace_ust_ht_match_event, &key, &iter.iter);
return NULL;
}
+/*
+ * Lookup an agent in the session agents hash table by domain type and return
+ * the object if found else NULL.
+ *
+ * RCU read side lock must be acquired before calling and only released
+ * once the agent is no longer in scope or being used.
+ */
+struct agent *trace_ust_find_agent(struct ltt_ust_session *session,
+ enum lttng_domain_type domain_type)
+{
+ struct agent *agt = NULL;
+ struct lttng_ht_node_u64 *node;
+ struct lttng_ht_iter iter;
+ uint64_t key;
+
+ assert(session);
+
+ DBG3("Trace ust agent lookup for domain %d", domain_type);
+
+ key = domain_type;
+
+ lttng_ht_lookup(session->agents, &key, &iter);
+ node = lttng_ht_iter_get_node_u64(&iter);
+ if (!node) {
+ goto end;
+ }
+ agt = caa_container_of(node, struct agent, node);
+
+end:
+ return agt;
+}
+
/*
* Allocate and initialize a ust session data structure.
*
* Return pointer to structure or NULL.
*/
-struct ltt_ust_session *trace_ust_create_session(char *path,
- unsigned int session_id, struct lttng_domain *domain)
+struct ltt_ust_session *trace_ust_create_session(uint64_t session_id)
{
struct ltt_ust_session *lus;
/* Init data structure */
lus->id = session_id;
- lus->start_trace = 0;
+ lus->active = 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);
+ /* Set default metadata channel attribute. */
+ lus->metadata_attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
+ lus->metadata_attr.subbuf_size = default_get_metadata_subbuf_size();
+ lus->metadata_attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
+ lus->metadata_attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER;
+ lus->metadata_attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER;
+ lus->metadata_attr.output = LTTNG_UST_MMAP;
+
+ /*
+ * 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);
+ /* Alloc agent hash table. */
+ lus->agents = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
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;
-
- /* Use the default consumer output which is the tracing session path. */
- if (path && strlen(path) > 0) {
- int ret;
-
- ret = snprintf(lus->consumer->dst.trace_path, PATH_MAX,
- "%s" DEFAULT_UST_TRACE_DIR, path);
- if (ret < 0) {
- PERROR("snprintf UST consumer trace path");
- goto error_path;
- }
-
- /* Set session path */
- ret = snprintf(lus->pathname, PATH_MAX, "%s" DEFAULT_UST_TRACE_DIR,
- path);
- if (ret < 0) {
- PERROR("snprintf kernel traces path");
- goto error_path;
- }
- }
-
DBG2("UST trace session create successful");
return lus;
-error_path:
- consumer_destroy_output(lus->consumer);
error_consumer:
- lttng_ht_destroy(lus->domain_global.channels);
- lttng_ht_destroy(lus->domain_exec);
- lttng_ht_destroy(lus->domain_pid);
+ ht_cleanup_push(lus->domain_global.channels);
+ ht_cleanup_push(lus->agents);
free(lus);
error:
return NULL;
* Return pointer to structure or NULL.
*/
struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan,
- char *path)
+ enum lttng_domain_type domain)
{
- int ret;
struct ltt_ust_channel *luc;
assert(chan);
- assert(path);
luc = zmalloc(sizeof(struct ltt_ust_channel));
if (luc == NULL) {
goto error;
}
+ luc->domain = domain;
+
/* Copy UST channel attributes */
luc->attr.overwrite = chan->attr.overwrite;
luc->attr.subbuf_size = chan->attr.subbuf_size;
break;
}
- /* Copy channel name */
- strncpy(luc->name, chan->name, sizeof(luc->name));
+ /*
+ * 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);
+ CDS_INIT_LIST_HEAD(&luc->ctx_list);
+
/* 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;
- }
+ /* 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;
+}
-error_free_channel:
- lttng_ht_destroy(luc->ctx);
- lttng_ht_destroy(luc->events);
- free(luc);
-error:
- return NULL;
+/*
+ * Validates an exclusion list.
+ *
+ * Returns 0 if valid, negative value if invalid.
+ */
+static int validate_exclusion(struct lttng_event_exclusion *exclusion)
+{
+ size_t i;
+ int ret = 0;
+
+ assert(exclusion);
+
+ for (i = 0; i < exclusion->count; ++i) {
+ size_t j;
+ const char *name_a =
+ LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i);
+
+ for (j = 0; j < i; ++j) {
+ const char *name_b =
+ LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, j);
+
+ if (!strncmp(name_a, name_b, LTTNG_SYMBOL_NAME_LEN)) {
+ /* Match! */
+ ret = -1;
+ goto end;
+ }
+ }
+ }
+
+end:
+ return ret;
}
/*
* Allocate and initialize a ust event. Set name and event type.
+ * We own filter_expression, filter, and exclusion.
*
* Return pointer to structure or NULL.
*/
struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev,
- struct lttng_filter_bytecode *filter)
+ char *filter_expression,
+ struct lttng_filter_bytecode *filter,
+ struct lttng_event_exclusion *exclusion,
+ bool internal_event)
{
struct ltt_ust_event *lue;
assert(ev);
+ if (exclusion && validate_exclusion(exclusion)) {
+ goto error;
+ }
+
lue = zmalloc(sizeof(struct ltt_ust_event));
if (lue == NULL) {
PERROR("ust event zmalloc");
goto error;
}
+ lue->internal = internal_event;
+
switch (ev->type) {
case LTTNG_EVENT_PROBE:
lue->attr.instrumentation = LTTNG_UST_PROBE;
}
/* Same layout. */
- lue->filter = (struct lttng_ust_filter_bytecode *) filter;
+ lue->filter_expression = filter_expression;
+ lue->filter = filter;
+ lue->exclusion = exclusion;
/* Init node */
lttng_ht_node_init_str(&lue->node, lue->attr.name);
error_free_event:
free(lue);
error:
+ free(filter_expression);
+ free(filter);
+ free(exclusion);
return NULL;
}
-/*
- * Allocate and initialize a ust metadata.
- *
- * Return pointer to structure or NULL.
- */
-struct ltt_ust_metadata *trace_ust_create_metadata(char *path)
+static
+int trace_ust_context_type_event_to_ust(enum lttng_event_context_type type)
{
- int ret;
- struct ltt_ust_metadata *lum;
-
- assert(path);
+ int utype;
- lum = zmalloc(sizeof(struct ltt_ust_metadata));
- if (lum == NULL) {
- PERROR("ust metadata zmalloc");
- goto error;
+ switch (type) {
+ 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;
+ case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
+ if (!ustctl_has_perf_counters()) {
+ utype = -1;
+ WARN("Perf counters not implemented in UST");
+ } else {
+ utype = LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER;
+ }
+ break;
+ default:
+ utype = -1;
+ break;
}
+ return utype;
+}
- /* 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_CHANNEL_SWITCH_TIMER;
- lum->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
- lum->attr.output = LTTNG_UST_MMAP;
+/*
+ * Return 1 if contexts match, 0 otherwise.
+ */
+int trace_ust_match_context(struct ltt_ust_context *uctx,
+ struct lttng_event_context *ctx)
+{
+ int utype;
- 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;
+ utype = trace_ust_context_type_event_to_ust(ctx->ctx);
+ if (utype < 0) {
+ return 0;
}
+ if (uctx->ctx.ctx != utype) {
+ return 0;
+ }
+ switch (utype) {
+ case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER:
+ if (uctx->ctx.u.perf_counter.type
+ != ctx->u.perf_counter.type) {
+ return 0;
+ }
+ if (uctx->ctx.u.perf_counter.config
+ != ctx->u.perf_counter.config) {
+ return 0;
+ }
+ if (strncmp(uctx->ctx.u.perf_counter.name,
+ ctx->u.perf_counter.name,
+ LTTNG_UST_SYM_NAME_LEN)) {
+ return 0;
+ }
+ break;
+ default:
+ break;
- return lum;
-
-error_free_metadata:
- free(lum);
-error:
- return NULL;
+ }
+ return 1;
}
/*
struct lttng_event_context *ctx)
{
struct ltt_ust_context *uctx;
- enum lttng_ust_context_type utype;
+ int 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;
- default:
+ utype = trace_ust_context_type_event_to_ust(ctx->ctx);
+ if (utype < 0) {
ERR("Invalid UST context");
return NULL;
}
goto error;
}
- uctx->ctx.ctx = utype;
+ uctx->ctx.ctx = (enum lttng_ust_context_type) utype;
+ switch (utype) {
+ case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER:
+ uctx->ctx.u.perf_counter.type = ctx->u.perf_counter.type;
+ uctx->ctx.u.perf_counter.config = ctx->u.perf_counter.config;
+ strncpy(uctx->ctx.u.perf_counter.name, ctx->u.perf_counter.name,
+ LTTNG_UST_SYM_NAME_LEN);
+ uctx->ctx.u.perf_counter.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
+ break;
+ default:
+ break;
+ }
lttng_ht_node_init_ulong(&uctx->node, (unsigned long) uctx->ctx.ctx);
return uctx;
return NULL;
}
+static
+void destroy_pid_tracker_node_rcu(struct rcu_head *head)
+{
+ struct ust_pid_tracker_node *tracker_node =
+ caa_container_of(head, struct ust_pid_tracker_node, node.head);
+ free(tracker_node);
+}
+
+static
+void destroy_pid_tracker_node(struct ust_pid_tracker_node *tracker_node)
+{
+
+ call_rcu(&tracker_node->node.head, destroy_pid_tracker_node_rcu);
+}
+
+static
+int init_pid_tracker(struct ust_pid_tracker *pid_tracker)
+{
+ int ret = 0;
+
+ pid_tracker->ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
+ if (!pid_tracker->ht) {
+ ret = -1;
+ goto end;
+ }
+
+end:
+ return ret;
+}
+
+/*
+ * Teardown pid tracker content, but don't free pid_tracker object.
+ */
+static
+void fini_pid_tracker(struct ust_pid_tracker *pid_tracker)
+{
+ struct ust_pid_tracker_node *tracker_node;
+ struct lttng_ht_iter iter;
+
+ if (!pid_tracker->ht) {
+ return;
+ }
+ rcu_read_lock();
+ cds_lfht_for_each_entry(pid_tracker->ht->ht,
+ &iter.iter, tracker_node, node.node) {
+ int ret = lttng_ht_del(pid_tracker->ht, &iter);
+
+ assert(!ret);
+ destroy_pid_tracker_node(tracker_node);
+ }
+ rcu_read_unlock();
+ ht_cleanup_push(pid_tracker->ht);
+ pid_tracker->ht = NULL;
+}
+
+static
+struct ust_pid_tracker_node *pid_tracker_lookup(
+ struct ust_pid_tracker *pid_tracker, int pid,
+ struct lttng_ht_iter *iter)
+{
+ unsigned long _pid = (unsigned long) pid;
+ struct lttng_ht_node_ulong *node;
+
+ lttng_ht_lookup(pid_tracker->ht, (void *) _pid, iter);
+ node = lttng_ht_iter_get_node_ulong(iter);
+ if (node) {
+ return caa_container_of(node, struct ust_pid_tracker_node,
+ node);
+ } else {
+ return NULL;
+ }
+}
+
+static
+int pid_tracker_add_pid(struct ust_pid_tracker *pid_tracker, int pid)
+{
+ int retval = LTTNG_OK;
+ struct ust_pid_tracker_node *tracker_node;
+ struct lttng_ht_iter iter;
+
+ if (pid < 0) {
+ retval = LTTNG_ERR_INVALID;
+ goto end;
+ }
+ tracker_node = pid_tracker_lookup(pid_tracker, pid, &iter);
+ if (tracker_node) {
+ /* Already exists. */
+ retval = LTTNG_ERR_PID_TRACKED;
+ goto end;
+ }
+ tracker_node = zmalloc(sizeof(*tracker_node));
+ if (!tracker_node) {
+ retval = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+ lttng_ht_node_init_ulong(&tracker_node->node, (unsigned long) pid);
+ lttng_ht_add_unique_ulong(pid_tracker->ht, &tracker_node->node);
+end:
+ return retval;
+}
+
+static
+int pid_tracker_del_pid(struct ust_pid_tracker *pid_tracker, int pid)
+{
+ int retval = LTTNG_OK, ret;
+ struct ust_pid_tracker_node *tracker_node;
+ struct lttng_ht_iter iter;
+
+ if (pid < 0) {
+ retval = LTTNG_ERR_INVALID;
+ goto end;
+ }
+ tracker_node = pid_tracker_lookup(pid_tracker, pid, &iter);
+ if (!tracker_node) {
+ /* Not found */
+ retval = LTTNG_ERR_PID_NOT_TRACKED;
+ goto end;
+ }
+ ret = lttng_ht_del(pid_tracker->ht, &iter);
+ assert(!ret);
+
+ destroy_pid_tracker_node(tracker_node);
+end:
+ return retval;
+}
+
+/*
+ * The session lock is held when calling this function.
+ */
+int trace_ust_pid_tracker_lookup(struct ltt_ust_session *session, int pid)
+{
+ struct lttng_ht_iter iter;
+
+ if (!session->pid_tracker.ht) {
+ return 1;
+ }
+ if (pid_tracker_lookup(&session->pid_tracker, pid, &iter)) {
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * Called with the session lock held.
+ */
+int trace_ust_track_pid(struct ltt_ust_session *session, int pid)
+{
+ int retval = LTTNG_OK;
+
+ if (pid == -1) {
+ /* Track all pids: destroy tracker if exists. */
+ if (session->pid_tracker.ht) {
+ fini_pid_tracker(&session->pid_tracker);
+ /* Ensure all apps have session. */
+ ust_app_global_update_all(session);
+ }
+ } else {
+ int ret;
+
+ if (!session->pid_tracker.ht) {
+ /* Create tracker. */
+ if (init_pid_tracker(&session->pid_tracker)) {
+ ERR("Error initializing PID tracker");
+ retval = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+ ret = pid_tracker_add_pid(&session->pid_tracker, pid);
+ if (ret != LTTNG_OK) {
+ retval = ret;
+ fini_pid_tracker(&session->pid_tracker);
+ goto end;
+ }
+ /* Remove all apps from session except pid. */
+ ust_app_global_update_all(session);
+ } else {
+ struct ust_app *app;
+
+ ret = pid_tracker_add_pid(&session->pid_tracker, pid);
+ if (ret != LTTNG_OK) {
+ retval = ret;
+ goto end;
+ }
+ /* Add session to application */
+ app = ust_app_find_by_pid(pid);
+ if (app) {
+ ust_app_global_update(session, app);
+ }
+ }
+ }
+end:
+ return retval;
+}
+
+/*
+ * Called with the session lock held.
+ */
+int trace_ust_untrack_pid(struct ltt_ust_session *session, int pid)
+{
+ int retval = LTTNG_OK;
+
+ if (pid == -1) {
+ /* Create empty tracker, replace old tracker. */
+ struct ust_pid_tracker tmp_tracker;
+
+ tmp_tracker = session->pid_tracker;
+ if (init_pid_tracker(&session->pid_tracker)) {
+ ERR("Error initializing PID tracker");
+ retval = LTTNG_ERR_NOMEM;
+ /* Rollback operation. */
+ session->pid_tracker = tmp_tracker;
+ goto end;
+ }
+ fini_pid_tracker(&tmp_tracker);
+
+ /* Remove session from all applications */
+ ust_app_global_update_all(session);
+ } else {
+ int ret;
+ struct ust_app *app;
+
+ if (!session->pid_tracker.ht) {
+ /* No PID being tracked. */
+ retval = LTTNG_ERR_PID_NOT_TRACKED;
+ goto end;
+ }
+ /* Remove PID from tracker */
+ ret = pid_tracker_del_pid(&session->pid_tracker, pid);
+ if (ret != LTTNG_OK) {
+ retval = ret;
+ goto end;
+ }
+ /* Remove session from application. */
+ app = ust_app_find_by_pid(pid);
+ if (app) {
+ ust_app_global_update(session, app);
+ }
+ }
+end:
+ return retval;
+}
+
+/*
+ * Called with session lock held.
+ */
+ssize_t trace_ust_list_tracker_pids(struct ltt_ust_session *session,
+ int32_t **_pids)
+{
+ struct ust_pid_tracker_node *tracker_node;
+ struct lttng_ht_iter iter;
+ unsigned long count, i = 0;
+ long approx[2];
+ int32_t *pids;
+ int ret = 0;
+
+ if (!session->pid_tracker.ht) {
+ /* Tracker disabled. Set first entry to -1. */
+ pids = zmalloc(sizeof(*pids));
+ if (!pids) {
+ ret = -1;
+ goto end;
+ }
+ pids[0] = -1;
+ *_pids = pids;
+ return 1;
+ }
+
+ rcu_read_lock();
+ cds_lfht_count_nodes(session->pid_tracker.ht->ht,
+ &approx[0], &count, &approx[1]);
+ pids = zmalloc(sizeof(*pids) * count);
+ if (!pids) {
+ ret = -1;
+ goto end;
+ }
+ cds_lfht_for_each_entry(session->pid_tracker.ht->ht,
+ &iter.iter, tracker_node, node.node) {
+ pids[i++] = tracker_node->node.key;
+ }
+ *_pids = pids;
+ ret = count;
+end:
+ rcu_read_unlock();
+ return ret;
+}
+
/*
* RCU safe free context structure.
*/
int ret;
struct lttng_ht_node_ulong *node;
struct lttng_ht_iter iter;
+ struct ltt_ust_context *ctx;
assert(ht);
+ rcu_read_lock();
cds_lfht_for_each_entry(ht->ht, &iter.iter, node, node) {
+ /* Remove from ordered list. */
+ ctx = caa_container_of(node, struct ltt_ust_context, node);
+ cds_list_del(&ctx->list);
+ /* Remove from channel's hash table. */
ret = lttng_ht_del(ht, &iter);
if (!ret) {
call_rcu(&node->head, destroy_context_rcu);
}
}
+ rcu_read_unlock();
- lttng_ht_destroy(ht);
+ ht_cleanup_push(ht);
}
/*
assert(event);
DBG2("Trace destroy UST event %s", event->attr.name);
+ free(event->filter_expression);
free(event->filter);
+ free(event->exclusion);
free(event);
}
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();
- lttng_ht_destroy(events);
+ ht_cleanup_push(events);
}
/*
* Cleanup ust channel structure.
+ *
+ * Should _NOT_ be called with RCU read lock held.
*/
-void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
+static void _trace_ust_destroy_channel(struct ltt_ust_channel *channel)
{
assert(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();
}
/*
struct ltt_ust_channel *channel =
caa_container_of(node, struct ltt_ust_channel, node);
- trace_ust_destroy_channel(channel);
+ _trace_ust_destroy_channel(channel);
}
-/*
- * 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)
+void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
{
- 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);
- }
-
- lttng_ht_destroy(channels);
+ /* Destroying all events of the channel */
+ destroy_events(channel->events);
+ /* Destroying all context of the channel */
+ destroy_contexts(channel->ctx);
- rcu_read_unlock();
+ call_rcu(&channel->node.head, destroy_channel_rcu);
}
/*
- * Cleanup UST pid domain.
+ * Remove an UST channel from a channel HT.
*/
-static void destroy_domain_pid(struct lttng_ht *ht)
+void trace_ust_delete_channel(struct lttng_ht *ht,
+ struct ltt_ust_channel *channel)
{
int ret;
struct lttng_ht_iter iter;
- struct ltt_ust_domain_pid *dpid;
assert(ht);
+ assert(channel);
- 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);
+ iter.iter.node = &channel->node.node;
+ ret = lttng_ht_del(ht, &iter);
+ assert(!ret);
}
/*
- * Cleanup UST exec name domain.
+ * Iterate over a hash table containing channels and cleanup safely.
*/
-static void destroy_domain_exec(struct lttng_ht *ht)
+static void destroy_channels(struct lttng_ht *channels)
{
- int ret;
+ struct lttng_ht_node_str *node;
struct lttng_ht_iter iter;
- struct ltt_ust_domain_exec *dexec;
- assert(ht);
+ assert(channels);
- cds_lfht_for_each_entry(ht->ht, &iter.iter, dexec, node.node) {
- ret = lttng_ht_del(ht , &iter);
- assert(!ret);
- destroy_channels(dexec->channels);
+ rcu_read_lock();
+ cds_lfht_for_each_entry(channels->ht, &iter.iter, node, node) {
+ struct ltt_ust_channel *chan =
+ caa_container_of(node, struct ltt_ust_channel, node);
+
+ trace_ust_delete_channel(channels, chan);
+ trace_ust_destroy_channel(chan);
}
+ rcu_read_unlock();
- lttng_ht_destroy(ht);
+ ht_cleanup_push(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)
{
- assert(session);
+ struct agent *agt;
+ struct buffer_reg_uid *reg, *sreg;
+ struct lttng_ht_iter iter;
- rcu_read_lock();
+ assert(session);
- DBG2("Trace UST destroy session %u", session->id);
+ DBG2("Trace UST destroy session %" PRIu64, session->id);
/* Cleaning up UST domain */
destroy_domain_global(&session->domain_global);
- destroy_domain_pid(session->domain_pid);
- destroy_domain_exec(session->domain_exec);
-
- consumer_destroy_output(session->consumer);
- consumer_destroy_output(session->tmp_consumer);
- free(session);
+ rcu_read_lock();
+ cds_lfht_for_each_entry(session->agents->ht, &iter.iter, agt, node.node) {
+ int ret = lttng_ht_del(session->agents, &iter);
+ assert(!ret);
+ agent_destroy(agt);
+ }
rcu_read_unlock();
+
+ ht_cleanup_push(session->agents);
+
+ /* 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_output_put(session->consumer);
+
+ fini_pid_tracker(&session->pid_tracker);
+
+ free(session);
}
projects / lttng-tools.git / blobdiff