*/
#define _LGPL_SOURCE
-#include <errno.h>
#include <inttypes.h>
#include <pthread.h>
#include <stdio.h>
#include <urcu/compiler.h>
#include <signal.h>
+#include <common/compat/errno.h>
#include <common/common.h>
+#include <common/hashtable/utils.h>
+#include <lttng/event-rule/event-rule.h>
+#include <lttng/event-rule/event-rule-internal.h>
+#include <lttng/event-rule/tracepoint.h>
+#include <lttng/condition/condition.h>
+#include <lttng/condition/event-rule-internal.h>
+#include <lttng/condition/event-rule.h>
#include <common/sessiond-comm/sessiond-comm.h>
#include "buffer-registry.h"
{
struct buffer_reg_uid *reg_uid = buffer_reg_uid_find(
ua_sess->tracing_id, ua_sess->bits_per_long,
- ua_sess->real_credentials.uid);
+ lttng_credentials_get_uid(&ua_sess->real_credentials));
if (!reg_uid) {
goto error;
}
free(ua_event);
}
+/*
+ * Delayed reclaim of a ust_app_event_notifier_rule object. This MUST be called
+ * through a call_rcu().
+ */
+static
+void free_ust_app_event_notifier_rule_rcu(struct rcu_head *head)
+{
+ struct ust_app_event_notifier_rule *obj = caa_container_of(
+ head, struct ust_app_event_notifier_rule, rcu_head);
+
+ free(obj);
+}
+
+/*
+ * Delete ust app event notifier rule safely.
+ */
+static void delete_ust_app_event_notifier_rule(int sock,
+ struct ust_app_event_notifier_rule *ua_event_notifier_rule,
+ struct ust_app *app)
+{
+ int ret;
+
+ assert(ua_event_notifier_rule);
+
+ if (ua_event_notifier_rule->exclusion != NULL) {
+ free(ua_event_notifier_rule->exclusion);
+ }
+
+ if (ua_event_notifier_rule->obj != NULL) {
+ pthread_mutex_lock(&app->sock_lock);
+ ret = ustctl_release_object(sock, ua_event_notifier_rule->obj);
+ pthread_mutex_unlock(&app->sock_lock);
+ if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("Failed to release event notifier object: app = '%s' (ppid %d), ret = %d",
+ app->name, (int) app->ppid, ret);
+ }
+
+ free(ua_event_notifier_rule->obj);
+ }
+
+ lttng_event_rule_put(ua_event_notifier_rule->event_rule);
+ call_rcu(&ua_event_notifier_rule->rcu_head,
+ free_ust_app_event_notifier_rule_rcu);
+}
+
/*
* Release ust data object of the given stream.
*
{
int ret, sock;
struct ust_app_session *ua_sess, *tmp_ua_sess;
+ struct lttng_ht_iter iter;
+ struct ust_app_event_notifier_rule *event_notifier_rule;
/*
* The session list lock must be held during this function to guarantee
rcu_read_unlock();
}
+ /* Remove the event notifier rules associated with this app. */
+ rcu_read_lock();
+ cds_lfht_for_each_entry (app->token_to_event_notifier_rule_ht->ht,
+ &iter.iter, event_notifier_rule, node.node) {
+ ret = lttng_ht_del(app->token_to_event_notifier_rule_ht, &iter);
+ assert(!ret);
+
+ delete_ust_app_event_notifier_rule(
+ app->sock, event_notifier_rule, app);
+ }
+
+ rcu_read_unlock();
+
ht_cleanup_push(app->sessions);
ht_cleanup_push(app->ust_sessions_objd);
ht_cleanup_push(app->ust_objd);
+ ht_cleanup_push(app->token_to_event_notifier_rule_ht);
+
+ /*
+ * This could be NULL if the event notifier setup failed (e.g the app
+ * was killed or the tracer does not support this feature).
+ */
+ if (app->event_notifier_group.object) {
+ enum lttng_error_code ret_code;
+ const int event_notifier_read_fd = lttng_pipe_get_readfd(
+ app->event_notifier_group.event_pipe);
+
+ ret_code = notification_thread_command_remove_tracer_event_source(
+ notification_thread_handle,
+ event_notifier_read_fd);
+ if (ret_code != LTTNG_OK) {
+ ERR("Failed to remove application tracer event source from notification thread");
+ }
+
+ ustctl_release_object(sock, app->event_notifier_group.object);
+ free(app->event_notifier_group.object);
+ }
+
+ lttng_pipe_destroy(app->event_notifier_group.event_pipe);
/*
* Wait until we have deleted the application from the sock hash table
return NULL;
}
+/*
+ * Allocate a new UST app event notifier rule.
+ */
+static struct ust_app_event_notifier_rule *alloc_ust_app_event_notifier_rule(
+ struct lttng_event_rule *event_rule, uint64_t token)
+{
+ enum lttng_event_rule_generate_exclusions_status
+ generate_exclusion_status;
+ struct ust_app_event_notifier_rule *ua_event_notifier_rule;
+
+ ua_event_notifier_rule = zmalloc(sizeof(struct ust_app_event_notifier_rule));
+ if (ua_event_notifier_rule == NULL) {
+ PERROR("Failed to allocate ust_app_event_notifier_rule structure");
+ goto error;
+ }
+
+ ua_event_notifier_rule->enabled = 1;
+ ua_event_notifier_rule->token = token;
+ lttng_ht_node_init_u64(&ua_event_notifier_rule->node, token);
+
+ /* Get reference of the event rule. */
+ if (!lttng_event_rule_get(event_rule)) {
+ abort();
+ }
+
+ ua_event_notifier_rule->event_rule = event_rule;
+ ua_event_notifier_rule->filter = lttng_event_rule_get_filter_bytecode(event_rule);
+ generate_exclusion_status = lttng_event_rule_generate_exclusions(
+ event_rule, &ua_event_notifier_rule->exclusion);
+ switch (generate_exclusion_status) {
+ case LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_OK:
+ case LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_NONE:
+ break;
+ default:
+ /* Error occured. */
+ ERR("Failed to generate exclusions from event rule while allocating an event notifier rule");
+ goto error_put_event_rule;
+ }
+
+ DBG3("UST app event notifier rule allocated: token = %" PRIu64,
+ ua_event_notifier_rule->token);
+
+ return ua_event_notifier_rule;
+
+error_put_event_rule:
+ lttng_event_rule_put(event_rule);
+error:
+ free(ua_event_notifier_rule);
+ return NULL;
+}
+
/*
* Alloc new UST app context.
*/
if (uctx) {
memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
if (uctx->ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) {
- char *provider_name = NULL, *ctx_name = NULL;
+ char *provider_name = NULL, *ctx_name = NULL;
provider_name = strdup(uctx->u.app_ctx.provider_name);
ctx_name = strdup(uctx->u.app_ctx.ctx_name);
* Return allocated filter or NULL on error.
*/
static struct lttng_ust_filter_bytecode *create_ust_bytecode_from_bytecode(
- struct lttng_filter_bytecode *orig_f)
+ const struct lttng_filter_bytecode *orig_f)
{
struct lttng_ust_filter_bytecode *filter = NULL;
return event;
}
+/*
+ * Look-up an event notifier rule based on its token id.
+ *
+ * Must be called with the RCU read lock held.
+ * Return an ust_app_event_notifier_rule object or NULL on error.
+ */
+static struct ust_app_event_notifier_rule *find_ust_app_event_notifier_rule(
+ struct lttng_ht *ht, uint64_t token)
+{
+ struct lttng_ht_iter iter;
+ struct lttng_ht_node_u64 *node;
+ struct ust_app_event_notifier_rule *event_notifier_rule = NULL;
+
+ assert(ht);
+
+ lttng_ht_lookup(ht, &token, &iter);
+ node = lttng_ht_iter_get_node_u64(&iter);
+ if (node == NULL) {
+ DBG2("UST app event notifier rule token not found: token = %" PRIu64,
+ token);
+ goto end;
+ }
+
+ event_notifier_rule = caa_container_of(
+ node, struct ust_app_event_notifier_rule, node);
+end:
+ return event_notifier_rule;
+}
+
/*
* Create the channel context on the tracer.
*
/*
* Set the filter on the tracer.
*/
-static
-int set_ust_event_filter(struct ust_app_event *ua_event,
- struct ust_app *app)
+static int set_ust_object_filter(struct ust_app *app,
+ const struct lttng_filter_bytecode *bytecode,
+ struct lttng_ust_object_data *ust_object)
{
int ret;
struct lttng_ust_filter_bytecode *ust_bytecode = NULL;
health_code_update();
- if (!ua_event->filter) {
- ret = 0;
- goto error;
- }
-
- ust_bytecode = create_ust_bytecode_from_bytecode(ua_event->filter);
+ ust_bytecode = create_ust_bytecode_from_bytecode(bytecode);
if (!ust_bytecode) {
ret = -LTTNG_ERR_NOMEM;
goto error;
}
pthread_mutex_lock(&app->sock_lock);
ret = ustctl_set_filter(app->sock, ust_bytecode,
- ua_event->obj);
+ ust_object);
pthread_mutex_unlock(&app->sock_lock);
if (ret < 0) {
if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app event %s filter failed for app (pid: %d) "
- "with ret %d", ua_event->attr.name, app->pid, ret);
+ ERR("UST app set object filter failed for object %p of app (pid: %d) "
+ "with ret %d", ust_object, app->pid, ret);
} else {
/*
* This is normal behavior, an application can die during the
* continue normally.
*/
ret = 0;
- DBG3("UST app filter event failed. Application is dead.");
+ DBG3("Failed to set UST app object filter. Application is dead.");
}
goto error;
}
- DBG2("UST filter set successfully for event %s", ua_event->name);
+ DBG2("UST filter successfully set for object %p", ust_object);
error:
health_code_update();
static
struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion(
- struct lttng_event_exclusion *exclusion)
+ const struct lttng_event_exclusion *exclusion)
{
struct lttng_ust_event_exclusion *ust_exclusion = NULL;
size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) +
/*
* Set event exclusions on the tracer.
*/
-static
-int set_ust_event_exclusion(struct ust_app_event *ua_event,
- struct ust_app *app)
+static int set_ust_object_exclusions(struct ust_app *app,
+ const struct lttng_event_exclusion *exclusions,
+ struct lttng_ust_object_data *ust_object)
{
int ret;
- struct lttng_ust_event_exclusion *ust_exclusion = NULL;
+ struct lttng_ust_event_exclusion *ust_exclusions = NULL;
- health_code_update();
+ assert(exclusions && exclusions->count > 0);
- if (!ua_event->exclusion || !ua_event->exclusion->count) {
- ret = 0;
- goto error;
- }
+ health_code_update();
- ust_exclusion = create_ust_exclusion_from_exclusion(
- ua_event->exclusion);
- if (!ust_exclusion) {
+ ust_exclusions = create_ust_exclusion_from_exclusion(
+ exclusions);
+ if (!ust_exclusions) {
ret = -LTTNG_ERR_NOMEM;
goto error;
}
pthread_mutex_lock(&app->sock_lock);
- ret = ustctl_set_exclusion(app->sock, ust_exclusion, ua_event->obj);
+ ret = ustctl_set_exclusion(app->sock, ust_exclusions, ust_object);
pthread_mutex_unlock(&app->sock_lock);
if (ret < 0) {
if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app event %s exclusions failed for app (pid: %d) "
- "with ret %d", ua_event->attr.name, app->pid, ret);
+ ERR("Failed to set UST app exclusions for object %p of app (pid: %d) "
+ "with ret %d", ust_object, app->pid, ret);
} else {
/*
* This is normal behavior, an application can die during the
* continue normally.
*/
ret = 0;
- DBG3("UST app event exclusion failed. Application is dead.");
+ DBG3("Failed to set UST app object exclusions. Application is dead.");
}
goto error;
}
- DBG2("UST exclusion set successfully for event %s", ua_event->name);
+ DBG2("UST exclusions set successfully for object %p", ust_object);
error:
health_code_update();
- free(ust_exclusion);
+ free(ust_exclusions);
return ret;
}
/*
* Disable the specified event on to UST tracer for the UST session.
*/
-static int disable_ust_event(struct ust_app *app,
- struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
+static int disable_ust_object(struct ust_app *app,
+ struct lttng_ust_object_data *object)
{
int ret;
health_code_update();
pthread_mutex_lock(&app->sock_lock);
- ret = ustctl_disable(app->sock, ua_event->obj);
+ ret = ustctl_disable(app->sock, object);
pthread_mutex_unlock(&app->sock_lock);
if (ret < 0) {
if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app event %s disable failed for app (pid: %d) "
- "and session handle %d with ret %d",
- ua_event->attr.name, app->pid, ua_sess->handle, ret);
+ ERR("Failed to disable UST app object %p app (pid: %d) with ret %d",
+ object, app->pid, ret);
} else {
/*
* This is normal behavior, an application can die during the
* continue normally.
*/
ret = 0;
- DBG3("UST app disable event failed. Application is dead.");
+ DBG3("Failed to disable UST app object. Application is dead.");
}
goto error;
}
- DBG2("UST app event %s disabled successfully for app (pid: %d)",
- ua_event->attr.name, app->pid);
+ DBG2("UST app object %p disabled successfully for app (pid: %d)",
+ object, app->pid);
error:
health_code_update();
/*
* Enable the specified event on to UST tracer for the UST session.
*/
-static int enable_ust_event(struct ust_app *app,
- struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
+static int enable_ust_object(
+ struct ust_app *app, struct lttng_ust_object_data *ust_object)
{
int ret;
health_code_update();
pthread_mutex_lock(&app->sock_lock);
- ret = ustctl_enable(app->sock, ua_event->obj);
+ ret = ustctl_enable(app->sock, ust_object);
pthread_mutex_unlock(&app->sock_lock);
if (ret < 0) {
if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app event %s enable failed for app (pid: %d) "
- "and session handle %d with ret %d",
- ua_event->attr.name, app->pid, ua_sess->handle, ret);
+ ERR("UST app enable failed for object %p app (pid: %d) with ret %d",
+ ust_object, app->pid, ret);
} else {
/*
* This is normal behavior, an application can die during the
* continue normally.
*/
ret = 0;
- DBG3("UST app enable event failed. Application is dead.");
+ DBG3("Failed to enable UST app object. Application is dead.");
}
goto error;
}
- DBG2("UST app event %s enabled successfully for app (pid: %d)",
- ua_event->attr.name, app->pid);
+ DBG2("UST app object %p enabled successfully for app (pid: %d)",
+ ust_object, app->pid);
error:
health_code_update();
ua_event->handle = ua_event->obj->handle;
- DBG2("UST app event %s created successfully for pid:%d",
- ua_event->attr.name, app->pid);
+ DBG2("UST app event %s created successfully for pid:%d object: %p",
+ ua_event->attr.name, app->pid, ua_event->obj);
health_code_update();
/* Set filter if one is present. */
if (ua_event->filter) {
- ret = set_ust_event_filter(ua_event, app);
+ ret = set_ust_object_filter(app, ua_event->filter, ua_event->obj);
if (ret < 0) {
goto error;
}
/* Set exclusions for the event */
if (ua_event->exclusion) {
- ret = set_ust_event_exclusion(ua_event, app);
+ ret = set_ust_object_exclusions(app, ua_event->exclusion, ua_event->obj);
if (ret < 0) {
goto error;
}
* We now need to explicitly enable the event, since it
* is now disabled at creation.
*/
- ret = enable_ust_event(app, ua_sess, ua_event);
+ ret = enable_ust_object(app, ua_event->obj);
if (ret < 0) {
/*
* If we hit an EPERM, something is wrong with our enable call. If
return ret;
}
+static int init_ust_event_notifier_from_event_rule(
+ const struct lttng_event_rule *rule,
+ struct lttng_ust_event_notifier *event_notifier)
+{
+ enum lttng_event_rule_status status;
+ enum lttng_loglevel_type loglevel_type;
+ enum lttng_ust_loglevel_type ust_loglevel_type = LTTNG_UST_LOGLEVEL_ALL;
+ int loglevel = -1, ret = 0;
+ const char *pattern;
+
+ /* For now only LTTNG_EVENT_RULE_TYPE_TRACEPOINT are supported. */
+ assert(lttng_event_rule_get_type(rule) ==
+ LTTNG_EVENT_RULE_TYPE_TRACEPOINT);
+
+ memset(event_notifier, 0, sizeof(*event_notifier));
+
+ status = lttng_event_rule_tracepoint_get_pattern(rule, &pattern);
+ if (status != LTTNG_EVENT_RULE_STATUS_OK) {
+ /* At this point, this is a fatal error. */
+ abort();
+ }
+
+ status = lttng_event_rule_tracepoint_get_log_level_type(
+ rule, &loglevel_type);
+ if (status != LTTNG_EVENT_RULE_STATUS_OK) {
+ /* At this point, this is a fatal error. */
+ abort();
+ }
+
+ switch (loglevel_type) {
+ case LTTNG_EVENT_LOGLEVEL_ALL:
+ ust_loglevel_type = LTTNG_UST_LOGLEVEL_ALL;
+ break;
+ case LTTNG_EVENT_LOGLEVEL_RANGE:
+ ust_loglevel_type = LTTNG_UST_LOGLEVEL_RANGE;
+ break;
+ case LTTNG_EVENT_LOGLEVEL_SINGLE:
+ ust_loglevel_type = LTTNG_UST_LOGLEVEL_SINGLE;
+ break;
+ default:
+ /* Unknown log level specification type. */
+ abort();
+ }
+
+ if (loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) {
+ status = lttng_event_rule_tracepoint_get_log_level(
+ rule, &loglevel);
+ assert(status == LTTNG_EVENT_RULE_STATUS_OK);
+ }
+
+ event_notifier->event.instrumentation = LTTNG_UST_TRACEPOINT;
+ ret = lttng_strncpy(event_notifier->event.name, pattern,
+ LTTNG_UST_SYM_NAME_LEN - 1);
+ if (ret) {
+ ERR("Failed to copy event rule pattern to notifier: pattern = '%s' ",
+ pattern);
+ goto end;
+ }
+
+ event_notifier->event.loglevel_type = ust_loglevel_type;
+ event_notifier->event.loglevel = loglevel;
+end:
+ return ret;
+}
+
+/*
+ * Create the specified event notifier against the user space tracer of a
+ * given application.
+ */
+static int create_ust_event_notifier(struct ust_app *app,
+ struct ust_app_event_notifier_rule *ua_event_notifier_rule)
+{
+ int ret = 0;
+ struct lttng_ust_event_notifier event_notifier;
+
+ health_code_update();
+ assert(app->event_notifier_group.object);
+
+ ret = init_ust_event_notifier_from_event_rule(
+ ua_event_notifier_rule->event_rule, &event_notifier);
+ if (ret) {
+ ERR("Failed to initialize UST event notifier from event rule: app = '%s' (ppid: %d)",
+ app->name, app->ppid);
+ goto error;
+ }
+
+ event_notifier.event.token = ua_event_notifier_rule->token;
+
+ /* Create UST event notifier against the tracer. */
+ pthread_mutex_lock(&app->sock_lock);
+ ret = ustctl_create_event_notifier(app->sock, &event_notifier,
+ app->event_notifier_group.object,
+ &ua_event_notifier_rule->obj);
+ pthread_mutex_unlock(&app->sock_lock);
+ if (ret < 0) {
+ if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
+ ERR("Error ustctl create event notifier: name = '%s', app = '%s' (ppid: %d), ret = %d",
+ event_notifier.event.name, app->name,
+ app->ppid, ret);
+ } else {
+ /*
+ * This is normal behavior, an application can die
+ * during the creation process. Don't report an error so
+ * the execution can continue normally.
+ */
+ ret = 0;
+ DBG3("UST app create event notifier failed (application is dead): app = '%s' (ppid = %d)",
+ app->name, app->ppid);
+ }
+
+ goto error;
+ }
+
+ ua_event_notifier_rule->handle = ua_event_notifier_rule->obj->handle;
+
+ DBG2("UST app event notifier %s created successfully: app = '%s' (ppid: %d), object: %p",
+ event_notifier.event.name, app->name, app->ppid,
+ ua_event_notifier_rule->obj);
+
+ health_code_update();
+
+ /* Set filter if one is present. */
+ if (ua_event_notifier_rule->filter) {
+ ret = set_ust_object_filter(app, ua_event_notifier_rule->filter,
+ ua_event_notifier_rule->obj);
+ if (ret < 0) {
+ goto error;
+ }
+ }
+
+ /* Set exclusions for the event. */
+ if (ua_event_notifier_rule->exclusion) {
+ ret = set_ust_object_exclusions(app,
+ ua_event_notifier_rule->exclusion,
+ ua_event_notifier_rule->obj);
+ if (ret < 0) {
+ goto error;
+ }
+ }
+
+ /*
+ * We now need to explicitly enable the event, since it
+ * is disabled at creation.
+ */
+ ret = enable_ust_object(app, ua_event_notifier_rule->obj);
+ if (ret < 0) {
+ /*
+ * If we hit an EPERM, something is wrong with our enable call.
+ * If we get an EEXIST, there is a problem on the tracer side
+ * since we just created it.
+ */
+ switch (ret) {
+ case -LTTNG_UST_ERR_PERM:
+ /* Code flow problem. */
+ abort();
+ case -LTTNG_UST_ERR_EXIST:
+ /* It's OK for our use case. */
+ ret = 0;
+ break;
+ default:
+ break;
+ }
+
+ goto error;
+ }
+
+ ua_event_notifier_rule->enabled = true;
+
+error:
+ health_code_update();
+ return ret;
+}
+
/*
* Copy data between an UST app event and a LTT event.
*/
ua_sess->tracing_id = usess->id;
ua_sess->id = get_next_session_id();
- ua_sess->real_credentials.uid = app->uid;
- ua_sess->real_credentials.gid = app->gid;
- ua_sess->effective_credentials.uid = usess->uid;
- ua_sess->effective_credentials.gid = usess->gid;
+ LTTNG_OPTIONAL_SET(&ua_sess->real_credentials.uid, app->uid);
+ LTTNG_OPTIONAL_SET(&ua_sess->real_credentials.gid, app->gid);
+ LTTNG_OPTIONAL_SET(&ua_sess->effective_credentials.uid, usess->uid);
+ LTTNG_OPTIONAL_SET(&ua_sess->effective_credentials.gid, usess->gid);
ua_sess->buffer_type = usess->buffer_type;
ua_sess->bits_per_long = app->bits_per_long;
case LTTNG_BUFFER_PER_UID:
ret = snprintf(ua_sess->path, sizeof(ua_sess->path),
DEFAULT_UST_TRACE_UID_PATH,
- ua_sess->real_credentials.uid,
+ lttng_credentials_get_uid(&ua_sess->real_credentials),
app->bits_per_long);
break;
default:
app->uint64_t_alignment, app->long_alignment,
app->byte_order, app->version.major, app->version.minor,
reg_pid->root_shm_path, reg_pid->shm_path,
- ua_sess->effective_credentials.uid,
- ua_sess->effective_credentials.gid, ua_sess->tracing_id,
+ lttng_credentials_get_uid(&ua_sess->effective_credentials),
+ lttng_credentials_get_gid(&ua_sess->effective_credentials),
+ ua_sess->tracing_id,
app->uid);
if (ret < 0) {
/*
*/
static
int create_ust_app_channel_context(struct ust_app_channel *ua_chan,
- struct lttng_ust_context_attr *uctx,
+ struct lttng_ust_context_attr *uctx,
struct ust_app *app)
{
int ret = 0;
{
int ret;
- ret = enable_ust_event(app, ua_sess, ua_event);
+ ret = enable_ust_object(app, ua_event->obj);
if (ret < 0) {
goto error;
}
{
int ret;
- ret = disable_ust_event(app, ua_sess, ua_event);
+ ret = disable_ust_object(app, ua_event->obj);
if (ret < 0) {
goto error;
}
notification_ret = notification_thread_command_add_channel(
notification_thread_handle, session->name,
- ua_sess->effective_credentials.uid,
- ua_sess->effective_credentials.gid, ua_chan->name,
+ lttng_credentials_get_uid(&ua_sess->effective_credentials),
+ lttng_credentials_get_gid(&ua_sess->effective_credentials),
+ ua_chan->name,
ua_chan->key, LTTNG_DOMAIN_UST,
ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf);
if (notification_ret != LTTNG_OK) {
cmd_ret = notification_thread_command_add_channel(
notification_thread_handle, session->name,
- ua_sess->effective_credentials.uid,
- ua_sess->effective_credentials.gid, ua_chan->name,
+ lttng_credentials_get_uid(&ua_sess->effective_credentials),
+ lttng_credentials_get_gid(&ua_sess->effective_credentials),
+ ua_chan->name,
ua_chan->key, LTTNG_DOMAIN_UST,
ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf);
if (cmd_ret != LTTNG_OK) {
/*
* Create UST app event and create it on the tracer side.
*
+ * Must be called with the RCU read side lock held.
* Called with ust app session mutex held.
*/
static
add_unique_ust_app_event(ua_chan, ua_event);
- DBG2("UST app create event %s for PID %d completed", ua_event->name,
- app->pid);
+ DBG2("UST app create event completed: app = '%s' (ppid: %d)",
+ app->name, app->ppid);
end:
return ret;
return ret;
}
+/*
+ * Create UST app event notifier rule and create it on the tracer side.
+ *
+ * Must be called with the RCU read side lock held.
+ * Called with ust app session mutex held.
+ */
+static
+int create_ust_app_event_notifier_rule(struct lttng_event_rule *rule,
+ struct ust_app *app, uint64_t token)
+{
+ int ret = 0;
+ struct ust_app_event_notifier_rule *ua_event_notifier_rule;
+
+ ua_event_notifier_rule = alloc_ust_app_event_notifier_rule(rule, token);
+ if (ua_event_notifier_rule == NULL) {
+ ret = -ENOMEM;
+ goto end;
+ }
+
+ /* Create it on the tracer side. */
+ ret = create_ust_event_notifier(app, ua_event_notifier_rule);
+ if (ret < 0) {
+ /*
+ * Not found previously means that it does not exist on the
+ * tracer. If the application reports that the event existed,
+ * it means there is a bug in the sessiond or lttng-ust
+ * (or corruption, etc.)
+ */
+ if (ret == -LTTNG_UST_ERR_EXIST) {
+ ERR("Tracer for application reported that an event notifier being created already exists: "
+ "token = \"%" PRIu64 "\", pid = %d, ppid = %d, uid = %d, gid = %d",
+ token,
+ app->pid, app->ppid, app->uid,
+ app->gid);
+ }
+ goto error;
+ }
+
+ lttng_ht_add_unique_u64(app->token_to_event_notifier_rule_ht,
+ &ua_event_notifier_rule->node);
+
+ DBG2("UST app create token event rule completed: app = '%s' (ppid: %d), token = %" PRIu64,
+ app->name, app->ppid, token);
+
+end:
+ return ret;
+
+error:
+ /* The RCU read side lock is already being held by the caller. */
+ delete_ust_app_event_notifier_rule(-1, ua_event_notifier_rule, app);
+ return ret;
+}
+
/*
* Create UST metadata and open it on the tracer side.
*
struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock)
{
struct ust_app *lta = NULL;
+ struct lttng_pipe *event_notifier_event_source_pipe = NULL;
assert(msg);
assert(sock >= 0);
goto error;
}
+ event_notifier_event_source_pipe = lttng_pipe_open(FD_CLOEXEC);
+ if (!event_notifier_event_source_pipe) {
+ PERROR("Failed to open application event source pipe: '%s' (ppid = %d)",
+ msg->name, msg->ppid);
+ goto error;
+ }
+
lta = zmalloc(sizeof(struct ust_app));
if (lta == NULL) {
PERROR("malloc");
- goto error;
+ goto error_free_pipe;
}
+ lta->event_notifier_group.event_pipe = event_notifier_event_source_pipe;
+
lta->ppid = msg->ppid;
lta->uid = msg->uid;
lta->gid = msg->gid;
lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
lta->notify_sock = -1;
+ lta->token_to_event_notifier_rule_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
/* Copy name and make sure it's NULL terminated. */
strncpy(lta->name, msg->name, sizeof(lta->name));
lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock);
CDS_INIT_LIST_HEAD(<a->teardown_head);
-error:
return lta;
+
+error_free_pipe:
+ lttng_pipe_destroy(event_notifier_event_source_pipe);
+error:
+ return NULL;
}
/*
return ret;
}
+/*
+ * Setup the base event notifier group.
+ *
+ * Return 0 on success else a negative value either an errno code or a
+ * LTTng-UST error code.
+ */
+int ust_app_setup_event_notifier_group(struct ust_app *app)
+{
+ int ret;
+ int event_pipe_write_fd;
+ struct lttng_ust_object_data *event_notifier_group = NULL;
+ enum lttng_error_code lttng_ret;
+
+ assert(app);
+
+ /* Get the write side of the pipe. */
+ event_pipe_write_fd = lttng_pipe_get_writefd(
+ app->event_notifier_group.event_pipe);
+
+ pthread_mutex_lock(&app->sock_lock);
+ ret = ustctl_create_event_notifier_group(app->sock,
+ event_pipe_write_fd, &event_notifier_group);
+ pthread_mutex_unlock(&app->sock_lock);
+ if (ret < 0) {
+ if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
+ ERR("Failed to create application event notifier group: ret = %d, app socket fd = %d, event_pipe_write_fd = %d",
+ ret, app->sock, event_pipe_write_fd);
+ } else {
+ DBG("Failed to create application event notifier group (application is dead): app socket fd = %d",
+ app->sock);
+ }
+
+ goto error;
+ }
+
+ ret = lttng_pipe_write_close(app->event_notifier_group.event_pipe);
+ if (ret) {
+ ERR("Failed to close write end of the application's event source pipe: app = '%s' (ppid = %d)",
+ app->name, app->ppid);
+ goto error;
+ }
+
+ lttng_ret = notification_thread_command_add_tracer_event_source(
+ notification_thread_handle,
+ lttng_pipe_get_readfd(app->event_notifier_group.event_pipe),
+ LTTNG_DOMAIN_UST);
+ if (lttng_ret != LTTNG_OK) {
+ ERR("Failed to add tracer event source to notification thread");
+ ret = - 1;
+ goto error;
+ }
+
+ /* Assign handle only when the complete setup is valid. */
+ app->event_notifier_group.object = event_notifier_group;
+ return ret;
+
+error:
+ ustctl_release_object(app->sock, app->event_notifier_group.object);
+ free(app->event_notifier_group.object);
+ return ret;
+}
+
/*
* Unregister app by removing it from the global traceable app list and freeing
* the data struct.
if (ust_app_ht_by_notify_sock) {
cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app,
notify_sock_n.node) {
- struct cds_lfht_node *node;
- struct ust_app *app;
-
- node = cds_lfht_iter_get_node(&iter.iter);
- if (!node) {
- continue;
- }
+ /*
+ * Assert that all notifiers are gone as all triggers
+ * are unregistered prior to this clean-up.
+ */
+ assert(lttng_ht_get_count(app->token_to_event_notifier_rule_ht) == 0);
- app = container_of(node, struct ust_app,
- notify_sock_n.node);
ust_app_notify_sock_unregister(app->notify_sock);
}
}
ret = ust_app_channel_allocate(ua_sess, uchan,
LTTNG_UST_CHAN_PER_CPU, usess,
&ua_chan);
- if (ret == 0) {
- ret = ust_app_channel_send(app, usess,
- ua_sess, ua_chan);
- } else {
- goto end;
+ if (ret < 0) {
+ goto error;
+ }
+
+ ret = ust_app_channel_send(app, usess,
+ ua_sess, ua_chan);
+ if (ret) {
+ goto error;
}
/* Add contexts. */
ret = create_ust_app_channel_context(ua_chan,
&uctx->ctx, app);
if (ret) {
- goto end;
+ goto error;
}
}
}
+
+error:
if (ret < 0) {
switch (ret) {
case -ENOTCONN:
break;
}
}
-end:
+
if (ret == 0 && _ua_chan) {
/*
* Only return the application's channel on success. Note
goto skip_setup;
}
- /*
- * Create the metadata for the application. This returns gracefully if a
- * metadata was already set for the session.
- */
- ret = create_ust_app_metadata(ua_sess, app, usess->consumer);
- if (ret < 0) {
- goto error_unlock;
- }
-
health_code_update();
skip_setup:
return ret;
}
+/* Called with RCU read-side lock held. */
+static
+void ust_app_synchronize_event_notifier_rules(struct ust_app *app)
+{
+ int ret = 0;
+ enum lttng_error_code ret_code;
+ enum lttng_trigger_status t_status;
+ struct lttng_ht_iter app_trigger_iter;
+ struct lttng_triggers *triggers = NULL;
+ struct ust_app_event_notifier_rule *event_notifier_rule;
+ unsigned int count, i;
+
+ /*
+ * Currrently, registering or unregistering a trigger with an
+ * event rule condition causes a full synchronization of the event
+ * notifiers.
+ *
+ * The first step attempts to add an event notifier for all registered
+ * triggers that apply to the user space tracers. Then, the
+ * application's event notifiers rules are all checked against the list
+ * of registered triggers. Any event notifier that doesn't have a
+ * matching trigger can be assumed to have been disabled.
+ *
+ * All of this is inefficient, but is put in place to get the feature
+ * rolling as it is simpler at this moment. It will be optimized Soon™
+ * to allow the state of enabled
+ * event notifiers to be synchronized in a piece-wise way.
+ */
+
+ /* Get all triggers using uid 0 (root) */
+ ret_code = notification_thread_command_list_triggers(
+ notification_thread_handle, 0, &triggers);
+ if (ret_code != LTTNG_OK) {
+ ret = -1;
+ goto end;
+ }
+
+ assert(triggers);
+
+ t_status = lttng_triggers_get_count(triggers, &count);
+ if (t_status != LTTNG_TRIGGER_STATUS_OK) {
+ ret = -1;
+ goto end;
+ }
+
+ for (i = 0; i < count; i++) {
+ struct lttng_condition *condition;
+ struct lttng_event_rule *event_rule;
+ struct lttng_trigger *trigger;
+ const struct ust_app_event_notifier_rule *looked_up_event_notifier_rule;
+ enum lttng_condition_status condition_status;
+ uint64_t token;
+
+ trigger = lttng_triggers_borrow_mutable_at_index(triggers, i);
+ assert(trigger);
+
+ token = lttng_trigger_get_tracer_token(trigger);
+ condition = lttng_trigger_get_condition(trigger);
+
+ if (lttng_condition_get_type(condition) != LTTNG_CONDITION_TYPE_EVENT_RULE_HIT) {
+ /* Does not apply */
+ continue;
+ }
+
+ condition_status = lttng_condition_event_rule_borrow_rule_mutable(condition, &event_rule);
+ assert(condition_status == LTTNG_CONDITION_STATUS_OK);
+
+ if (lttng_event_rule_get_domain_type(event_rule) == LTTNG_DOMAIN_KERNEL) {
+ /* Skip kernel related triggers. */
+ continue;
+ }
+
+ /*
+ * Find or create the associated token event rule. The caller
+ * holds the RCU read lock, so this is safe to call without
+ * explicitly acquiring it here.
+ */
+ looked_up_event_notifier_rule = find_ust_app_event_notifier_rule(
+ app->token_to_event_notifier_rule_ht, token);
+ if (!looked_up_event_notifier_rule) {
+ ret = create_ust_app_event_notifier_rule(event_rule, app, token);
+ if (ret < 0) {
+ goto end;
+ }
+ }
+ }
+
+ rcu_read_lock();
+ /* Remove all unknown event sources from the app. */
+ cds_lfht_for_each_entry (app->token_to_event_notifier_rule_ht->ht,
+ &app_trigger_iter.iter, event_notifier_rule,
+ node.node) {
+ const uint64_t app_token = event_notifier_rule->token;
+ bool found = false;
+
+ /*
+ * Check if the app event trigger still exists on the
+ * notification side.
+ */
+ for (i = 0; i < count; i++) {
+ uint64_t notification_thread_token;
+ const struct lttng_trigger *trigger =
+ lttng_triggers_get_at_index(
+ triggers, i);
+
+ assert(trigger);
+
+ notification_thread_token =
+ lttng_trigger_get_tracer_token(trigger);
+
+ if (notification_thread_token == app_token) {
+ found = true;
+ break;
+ }
+ }
+
+ if (found) {
+ /* Still valid. */
+ continue;
+ }
+
+ /*
+ * This trigger was unregistered, disable it on the tracer's
+ * side.
+ */
+ ret = lttng_ht_del(app->token_to_event_notifier_rule_ht,
+ &app_trigger_iter);
+ assert(ret == 0);
+
+ /* Callee logs errors. */
+ (void) disable_ust_object(app, event_notifier_rule->obj);
+
+ delete_ust_app_event_notifier_rule(
+ app->sock, event_notifier_rule, app);
+ }
+
+ rcu_read_unlock();
+
+end:
+ lttng_triggers_destroy(triggers);
+ return;
+}
+
/*
* The caller must ensure that the application is compatible and is tracked
- * by the PID tracker.
+ * by the process attribute trackers.
*/
static
void ust_app_synchronize(struct ltt_ust_session *usess,
}
rcu_read_lock();
+
cds_lfht_for_each_entry(usess->domain_global.channels->ht, &uchan_iter,
uchan, node.node) {
struct ust_app_channel *ua_chan;
* allocated (if necessary) and sent to the application, and
* all enabled contexts will be added to the channel.
*/
- ret = find_or_create_ust_app_channel(usess, ua_sess,
+ ret = find_or_create_ust_app_channel(usess, ua_sess,
app, uchan, &ua_chan);
if (ret) {
/* Tracer is probably gone or ENOMEM. */
}
}
}
+
+ /*
+ * Create the metadata for the application. This returns gracefully if a
+ * metadata was already set for the session.
+ *
+ * The metadata channel must be created after the data channels as the
+ * consumer daemon assumes this ordering. When interacting with a relay
+ * daemon, the consumer will use this assumption to send the
+ * "STREAMS_SENT" message to the relay daemon.
+ */
+ ret = create_ust_app_metadata(ua_sess, app, usess->consumer);
+ if (ret < 0) {
+ goto error_unlock;
+ }
+
rcu_read_unlock();
end:
}
}
+/*
+ * Add all event notifiers to an application.
+ *
+ * Called with session lock held.
+ * Called with RCU read-side lock held.
+ */
+void ust_app_global_update_event_notifier_rules(struct ust_app *app)
+{
+ DBG2("UST application global event notifier rules update: app = '%s' (ppid: %d)",
+ app->name, app->ppid);
+
+ if (!app->compatible) {
+ return;
+ }
+
+ if (app->event_notifier_group.object == NULL) {
+ WARN("UST app global update of event notifiers for app skipped since communication handle is null: app = '%s' (ppid: %d)",
+ app->name, app->ppid);
+ return;
+ }
+
+ ust_app_synchronize_event_notifier_rules(app);
+}
+
/*
* Called with session lock held.
*/
rcu_read_unlock();
}
+void ust_app_global_update_all_event_notifier_rules(void)
+{
+ struct lttng_ht_iter iter;
+ struct ust_app *app;
+
+ rcu_read_lock();
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
+ ust_app_global_update_event_notifier_rules(app);
+ }
+
+ rcu_read_unlock();
+}
+
/*
* Add context to a specific channel for global UST domain.
*/
status = LTTNG_ERR_INVALID;
goto error;
}
- /* Add the UST default trace dir to path. */
+ /* Add the UST default trace dir to path. */
cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
reg_chan, node.node) {
status = consumer_snapshot_channel(socket,
status = LTTNG_ERR_INVALID;
goto error;
}
- cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
+ cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
ua_chan, node.node) {
status = consumer_snapshot_channel(socket,
ua_chan->key, output, 0,
- ua_sess->effective_credentials
- .uid,
- ua_sess->effective_credentials
- .gid,
+ lttng_credentials_get_uid(&ua_sess->effective_credentials),
+ lttng_credentials_get_gid(&ua_sess->effective_credentials),
&trace_path[consumer_path_offset], wait,
nb_packets_per_stream);
switch (status) {
}
status = consumer_snapshot_channel(socket,
registry->metadata_key, output, 1,
- ua_sess->effective_credentials.uid,
- ua_sess->effective_credentials.gid,
+ lttng_credentials_get_uid(&ua_sess->effective_credentials),
+ lttng_credentials_get_gid(&ua_sess->effective_credentials),
&trace_path[consumer_path_offset], wait, 0);
switch (status) {
case LTTNG_OK:
ua_chan, node.node) {
ret = consumer_rotate_channel(socket,
ua_chan->key,
- ua_sess->effective_credentials
- .uid,
- ua_sess->effective_credentials
- .gid,
+ lttng_credentials_get_uid(&ua_sess->effective_credentials),
+ lttng_credentials_get_gid(&ua_sess->effective_credentials),
ua_sess->consumer,
/* is_metadata_channel */ false);
if (ret < 0) {
(void) push_metadata(registry, usess->consumer);
ret = consumer_rotate_channel(socket,
registry->metadata_key,
- ua_sess->effective_credentials.uid,
- ua_sess->effective_credentials.gid,
+ lttng_credentials_get_uid(&ua_sess->effective_credentials),
+ lttng_credentials_get_gid(&ua_sess->effective_credentials),
ua_sess->consumer,
/* is_metadata_channel */ true);
if (ret < 0) {
rcu_read_unlock();
return cmd_ret;
}
+
+/*
+ * This function skips the metadata channel as the begin/end timestamps of a
+ * metadata packet are useless.
+ *
+ * Moreover, opening a packet after a "clear" will cause problems for live
+ * sessions as it will introduce padding that was not part of the first trace
+ * chunk. The relay daemon expects the content of the metadata stream of
+ * successive metadata trace chunks to be strict supersets of one another.
+ *
+ * For example, flushing a packet at the beginning of the metadata stream of
+ * a trace chunk resulting from a "clear" session command will cause the
+ * size of the metadata stream of the new trace chunk to not match the size of
+ * the metadata stream of the original chunk. This will confuse the relay
+ * daemon as the same "offset" in a metadata stream will no longer point
+ * to the same content.
+ */
+enum lttng_error_code ust_app_open_packets(struct ltt_session *session)
+{
+ enum lttng_error_code ret = LTTNG_OK;
+ struct lttng_ht_iter iter;
+ struct ltt_ust_session *usess = session->ust_session;
+
+ assert(usess);
+
+ rcu_read_lock();
+
+ switch (usess->buffer_type) {
+ case LTTNG_BUFFER_PER_UID:
+ {
+ struct buffer_reg_uid *reg;
+
+ cds_list_for_each_entry (
+ reg, &usess->buffer_reg_uid_list, lnode) {
+ struct buffer_reg_channel *reg_chan;
+ struct consumer_socket *socket;
+
+ socket = consumer_find_socket_by_bitness(
+ reg->bits_per_long, usess->consumer);
+ if (!socket) {
+ ret = LTTNG_ERR_FATAL;
+ goto error;
+ }
+
+ cds_lfht_for_each_entry(reg->registry->channels->ht,
+ &iter.iter, reg_chan, node.node) {
+ const int open_ret =
+ consumer_open_channel_packets(
+ socket,
+ reg_chan->consumer_key);
+
+ if (open_ret < 0) {
+ ret = LTTNG_ERR_UNK;
+ goto error;
+ }
+ }
+ }
+ break;
+ }
+ case LTTNG_BUFFER_PER_PID:
+ {
+ struct ust_app *app;
+
+ cds_lfht_for_each_entry (
+ ust_app_ht->ht, &iter.iter, app, pid_n.node) {
+ struct consumer_socket *socket;
+ struct lttng_ht_iter chan_iter;
+ struct ust_app_channel *ua_chan;
+ struct ust_app_session *ua_sess;
+ struct ust_registry_session *registry;
+
+ ua_sess = lookup_session_by_app(usess, app);
+ if (!ua_sess) {
+ /* Session not associated with this app. */
+ continue;
+ }
+
+ /* Get the right consumer socket for the application. */
+ socket = consumer_find_socket_by_bitness(
+ app->bits_per_long, usess->consumer);
+ if (!socket) {
+ ret = LTTNG_ERR_FATAL;
+ goto error;
+ }
+
+ registry = get_session_registry(ua_sess);
+ if (!registry) {
+ DBG("Application session is being torn down. Skip application.");
+ continue;
+ }
+
+ cds_lfht_for_each_entry(ua_sess->channels->ht,
+ &chan_iter.iter, ua_chan, node.node) {
+ const int open_ret =
+ consumer_open_channel_packets(
+ socket,
+ ua_chan->key);
+
+ if (open_ret < 0) {
+ /*
+ * Per-PID buffer and application going
+ * away.
+ */
+ if (open_ret == -LTTNG_ERR_CHAN_NOT_FOUND) {
+ continue;
+ }
+
+ ret = LTTNG_ERR_UNK;
+ goto error;
+ }
+ }
+ }
+ break;
+ }
+ default:
+ abort();
+ break;
+ }
+
+error:
+ rcu_read_unlock();
+ return ret;
+}
projects / lttng-tools.git / blobdiff