{
struct ust_app_event *event;
const struct ust_app_ht_key *key;
- int ev_loglevel_value;
assert(node);
assert(_key);
event = caa_container_of(node, struct ust_app_event, node.node);
key = _key;
- ev_loglevel_value = event->attr.loglevel;
/* Match the 4 elements of the key: name, filter, loglevel, exclusions */
}
/* Event loglevel. */
- if (ev_loglevel_value != key->loglevel_type) {
- if (event->attr.loglevel_type == LTTNG_UST_ABI_LOGLEVEL_ALL
- && key->loglevel_type == 0 &&
- ev_loglevel_value == -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;
- }
+ if (!loglevels_match(event->attr.loglevel_type, event->attr.loglevel,
+ key->loglevel_type, key->loglevel_value,
+ LTTNG_UST_ABI_LOGLEVEL_ALL)) {
+ goto no_match;
}
/* One of the filters is NULL, fail. */
ht = ua_chan->events;
key.name = event->attr.name;
key.filter = event->filter;
- key.loglevel_type = event->attr.loglevel;
+ key.loglevel_type = (enum lttng_ust_abi_loglevel_type)
+ event->attr.loglevel_type;
+ key.loglevel_value = event->attr.loglevel;
key.exclusion = event->exclusion;
node_ptr = cds_lfht_add_unique(ht->ht,
* Return an ust_app_event object or NULL on error.
*/
static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht,
- const char *name, const struct lttng_bytecode *filter,
+ const char *name,
+ const struct lttng_bytecode *filter,
+ enum lttng_ust_abi_loglevel_type loglevel_type,
int loglevel_value,
const struct lttng_event_exclusion *exclusion)
{
/* Setup key for event lookup. */
key.name = name;
key.filter = filter;
- key.loglevel_type = loglevel_value;
+ key.loglevel_type = loglevel_type;
+ key.loglevel_value = loglevel_value;
/* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */
key.exclusion = exclusion;
event_notifier->event.instrumentation = LTTNG_UST_ABI_TRACEPOINT;
ret = lttng_strncpy(event_notifier->event.name, pattern,
- LTTNG_UST_ABI_SYM_NAME_LEN - 1);
+ sizeof(event_notifier->event.name));
if (ret) {
ERR("Failed to copy event rule pattern to notifier: pattern = '%s' ",
pattern);
/* Send all streams to application. */
pthread_mutex_lock(&buf_reg_chan->stream_list_lock);
cds_list_for_each_entry(reg_stream, &buf_reg_chan->streams, lnode) {
- struct ust_app_stream stream;
+ struct ust_app_stream stream = {};
ret = duplicate_stream_object(reg_stream, &stream);
if (ret < 0) {
* Treat this the same way as an application
* that is exiting.
*/
- WARN("Communication with application %d timed out on send_stream for stream \"%s\" of channel \"%s\" of session \"%" PRIu64 "\".",
- app->pid, stream.name,
+ WARN("Communication with application %d timed out on send_stream for stream of channel \"%s\" of session \"%" PRIu64 "\".",
+ app->pid,
ua_chan->name,
ua_sess->tracing_id);
ret = -ENOTCONN;
goto error_free_pipe;
}
+ urcu_ref_init(<a->ref);
+
lta->event_notifier_group.event_pipe = event_notifier_event_source_pipe;
lta->ppid = msg->ppid;
return ret;
}
-/*
- * Unregister app by removing it from the global traceable app list and freeing
- * the data struct.
- *
- * The socket is already closed at this point so no close to sock.
- */
-void ust_app_unregister(int sock)
+static void ust_app_unregister(struct ust_app *app)
{
- struct ust_app *lta;
- struct lttng_ht_node_ulong *node;
- struct lttng_ht_iter ust_app_sock_iter;
+ int ret;
struct lttng_ht_iter iter;
struct ust_app_session *ua_sess;
- int ret;
rcu_read_lock();
- /* Get the node reference for a call_rcu */
- lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter);
- node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter);
- assert(node);
-
- lta = caa_container_of(node, struct ust_app, sock_n);
- DBG("PID %d unregistering with sock %d", lta->pid, sock);
-
/*
* For per-PID buffers, perform "push metadata" and flush all
* application streams before removing app from hash tables,
* ensuring proper behavior of data_pending check.
* Remove sessions so they are not visible during deletion.
*/
- cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess,
+ cds_lfht_for_each_entry(app->sessions->ht, &iter.iter, ua_sess,
node.node) {
struct ust_registry_session *registry;
- ret = lttng_ht_del(lta->sessions, &iter);
+ ret = lttng_ht_del(app->sessions, &iter);
if (ret) {
/* The session was already removed so scheduled for teardown. */
continue;
}
if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) {
- (void) ust_app_flush_app_session(lta, ua_sess);
+ (void) ust_app_flush_app_session(app, ua_sess);
}
/*
(void) close_metadata(registry, ua_sess->consumer);
}
}
- cds_list_add(&ua_sess->teardown_node, <a->teardown_head);
+ cds_list_add(&ua_sess->teardown_node, &app->teardown_head);
pthread_mutex_unlock(&ua_sess->lock);
}
- /* Remove application from PID hash table */
- ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter);
- assert(!ret);
-
/*
* Remove application from notify hash table. The thread handling the
* notify socket could have deleted the node so ignore on error because
* either way it's valid. The close of that socket is handled by the
* apps_notify_thread.
*/
- iter.iter.node = <a->notify_sock_n.node;
+ iter.iter.node = &app->notify_sock_n.node;
(void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter);
- /*
- * Ignore return value since the node might have been removed before by an
- * add replace during app registration because the PID can be reassigned by
- * the OS.
- */
- iter.iter.node = <a->pid_n.node;
+ iter.iter.node = &app->pid_n.node;
ret = lttng_ht_del(ust_app_ht, &iter);
if (ret) {
- DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
- lta->pid);
+ WARN("Unregister app by PID %d failed", app->pid);
}
- /* Free memory */
- call_rcu(<a->pid_n.head, delete_ust_app_rcu);
+ rcu_read_unlock();
+}
+/*
+ * Unregister app by removing it from the global traceable app list and freeing
+ * the data struct.
+ *
+ * The socket is already closed at this point, so there is no need to close it.
+ */
+void ust_app_unregister_by_socket(int sock)
+{
+ struct ust_app *app;
+ struct lttng_ht_node_ulong *node;
+ struct lttng_ht_iter ust_app_sock_iter;
+ int ret;
+
+ rcu_read_lock();
+
+ /* Get the node reference for a call_rcu */
+ lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter);
+ node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter);
+ assert(node);
+
+ app = caa_container_of(node, struct ust_app, sock_n);
+
+ DBG("PID %d unregistering with sock %d", app->pid, sock);
+
+ /* Remove application from socket hash table */
+ ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter);
+ assert(!ret);
+
+ /*
+ * The socket is closed: release its reference to the application
+ * to trigger its eventual teardown.
+ */
+ ust_app_put(app);
rcu_read_unlock();
- return;
}
/*
* are unregistered prior to this clean-up.
*/
assert(lttng_ht_get_count(app->token_to_event_notifier_rule_ht) == 0);
-
ust_app_notify_sock_unregister(app->notify_sock);
}
}
- if (ust_app_ht) {
- cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
- ret = lttng_ht_del(ust_app_ht, &iter);
- assert(!ret);
- call_rcu(&app->pid_n.head, delete_ust_app_rcu);
- }
- }
-
/* Cleanup socket hash table */
if (ust_app_ht_by_sock) {
cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app,
sock_n.node) {
ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
assert(!ret);
+
+ ust_app_put(app);
}
}
}
ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
- ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
- uevent->filter, uevent->attr.loglevel,
- uevent->exclusion);
+ ua_event = find_ust_app_event(ua_chan->events,
+ uevent->attr.name, uevent->filter,
+ (enum lttng_ust_abi_loglevel_type)
+ uevent->attr.loglevel_type,
+ uevent->attr.loglevel, uevent->exclusion);
if (ua_event == NULL) {
DBG2("Event %s not found in channel %s for app pid %d."
"Skipping", uevent->attr.name, uchan->name, app->pid);
ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
/* Get event node */
- ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
- uevent->filter, uevent->attr.loglevel, uevent->exclusion);
+ ua_event = find_ust_app_event(ua_chan->events,
+ uevent->attr.name, uevent->filter,
+ (enum lttng_ust_abi_loglevel_type)
+ uevent->attr.loglevel_type,
+ uevent->attr.loglevel, uevent->exclusion);
if (ua_event == NULL) {
DBG3("UST app enable event %s not found for app PID %d."
"Skipping app", uevent->attr.name, app->pid);
struct ust_app_event *ua_event = NULL;
ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
- uevent->filter, uevent->attr.loglevel, uevent->exclusion);
+ uevent->filter,
+ (enum lttng_ust_abi_loglevel_type)
+ uevent->attr.loglevel_type,
+ uevent->attr.loglevel, uevent->exclusion);
if (!ua_event) {
ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
if (ret < 0) {
return ua_chan;
}
+/*
+ * Fixup legacy context fields for comparison:
+ * - legacy array becomes array_nestable,
+ * - legacy struct becomes struct_nestable,
+ * - legacy variant becomes variant_nestable,
+ * legacy sequences are not emitted in LTTng-UST contexts.
+ */
+static int ust_app_fixup_legacy_context_fields(size_t *_nr_fields,
+ struct lttng_ust_ctl_field **_fields)
+{
+ struct lttng_ust_ctl_field *fields = *_fields, *new_fields = NULL;
+ size_t nr_fields = *_nr_fields, new_nr_fields = 0, i, j;
+ bool found = false;
+ int ret = 0;
+
+ for (i = 0; i < nr_fields; i++) {
+ const struct lttng_ust_ctl_field *field = &fields[i];
+
+ switch (field->type.atype) {
+ case lttng_ust_ctl_atype_sequence:
+ ERR("Unexpected legacy sequence context.");
+ ret = -EINVAL;
+ goto end;
+ case lttng_ust_ctl_atype_array:
+ switch (field->type.u.legacy.array.elem_type.atype) {
+ case lttng_ust_ctl_atype_integer:
+ break;
+ default:
+ ERR("Unexpected legacy array element type in context.");
+ ret = -EINVAL;
+ goto end;
+ }
+ found = true;
+ /* One field for array_nested, one field for elem type. */
+ new_nr_fields += 2;
+ break;
+
+ case lttng_ust_ctl_atype_struct: /* Fallthrough */
+ case lttng_ust_ctl_atype_variant:
+ found = true;
+ new_nr_fields++;
+ break;
+ default:
+ new_nr_fields++;
+ break;
+ }
+ }
+ if (!found) {
+ goto end;
+ }
+ new_fields = (struct lttng_ust_ctl_field *) zmalloc(sizeof(*new_fields) * new_nr_fields);
+ if (!new_fields) {
+ ret = -ENOMEM;
+ goto end;
+ }
+ for (i = 0, j = 0; i < nr_fields; i++, j++) {
+ const struct lttng_ust_ctl_field *field = &fields[i];
+ struct lttng_ust_ctl_field *new_field = &new_fields[j];
+
+ switch (field->type.atype) {
+ case lttng_ust_ctl_atype_array:
+ /* One field for array_nested, one field for elem type. */
+ strncpy(new_field->name, field->name, LTTNG_UST_ABI_SYM_NAME_LEN - 1);
+ new_field->type.atype = lttng_ust_ctl_atype_array_nestable;
+ new_field->type.u.array_nestable.length = field->type.u.legacy.array.length;
+ new_field->type.u.array_nestable.alignment = 0;
+ new_field = &new_fields[++j]; /* elem type */
+ new_field->type.atype = field->type.u.legacy.array.elem_type.atype;
+ assert(new_field->type.atype == lttng_ust_ctl_atype_integer);
+ new_field->type.u.integer = field->type.u.legacy.array.elem_type.u.basic.integer;
+ break;
+ case lttng_ust_ctl_atype_struct:
+ strncpy(new_field->name, field->name, LTTNG_UST_ABI_SYM_NAME_LEN - 1);
+ new_field->type.atype = lttng_ust_ctl_atype_struct_nestable;
+ new_field->type.u.struct_nestable.nr_fields = field->type.u.legacy._struct.nr_fields;
+ new_field->type.u.struct_nestable.alignment = 0;
+ break;
+ case lttng_ust_ctl_atype_variant:
+ strncpy(new_field->name, field->name, LTTNG_UST_ABI_SYM_NAME_LEN - 1);
+ new_field->type.atype = lttng_ust_ctl_atype_variant_nestable;
+ new_field->type.u.variant_nestable.nr_choices = field->type.u.legacy.variant.nr_choices;
+ strncpy(new_field->type.u.variant_nestable.tag_name,
+ field->type.u.legacy.variant.tag_name,
+ LTTNG_UST_ABI_SYM_NAME_LEN - 1);
+ new_field->type.u.variant_nestable.alignment = 0;
+ break;
+ default:
+ *new_field = *field;
+ break;
+ }
+ }
+ free(fields);
+ *_fields = new_fields;
+ *_nr_fields = new_nr_fields;
+end:
+ return ret;
+}
+
/*
* Reply to a register channel notification from an application on the notify
* socket. The channel metadata is also created.
int ret, ret_code = 0;
uint32_t chan_id;
uint64_t chan_reg_key;
- enum lttng_ust_ctl_channel_header type;
+ enum lttng_ust_ctl_channel_header type = LTTNG_UST_CTL_CHANNEL_HEADER_UNKNOWN;
struct ust_app *app;
struct ust_app_channel *ua_chan;
struct ust_app_session *ua_sess;
/* Channel id is set during the object creation. */
chan_id = ust_reg_chan->chan_id;
+ ret = ust_app_fixup_legacy_context_fields(&nr_fields, &fields);
+ if (ret < 0) {
+ ERR("Registering application channel due to legacy context fields fixup error: pid = %d, sock = %d",
+ app->pid, app->sock);
+ ret_code = -EINVAL;
+ goto reply;
+ }
if (!ust_reg_chan->register_done) {
/*
* TODO: eventually use the registry event count for
/*
* Destroy a ust app data structure and free its memory.
*/
-void ust_app_destroy(struct ust_app *app)
+static void ust_app_destroy(struct ust_app *app)
{
if (!app) {
return;
int ret;
enum lttng_error_code cmd_ret = LTTNG_OK;
struct lttng_ht_iter iter;
- struct ust_app *app;
+ struct ust_app *app = NULL;
struct ltt_ust_session *usess = session->ust_session;
assert(usess);
struct ust_app_channel *ua_chan;
struct ust_app_session *ua_sess;
struct ust_registry_session *registry;
+ bool app_reference_taken;
+
+ app_reference_taken = ust_app_get(app);
+ if (!app_reference_taken) {
+ /* Application unregistered concurrently, skip it. */
+ DBG("Could not get application reference as it is being torn down; skipping application");
+ continue;
+ }
ua_sess = lookup_session_by_app(usess, app);
if (!ua_sess) {
/* Session not associated with this app. */
+ ust_app_put(app);
+ app = NULL;
continue;
}
goto error;
}
+
registry = get_session_registry(ua_sess);
- if (!registry) {
- DBG("Application session is being torn down. Skip application.");
- continue;
- }
+ assert(registry);
/* Rotate the data channels. */
cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
ua_sess->consumer,
/* is_metadata_channel */ false);
if (ret < 0) {
- /* Per-PID buffer and application going away. */
- if (ret == -LTTNG_ERR_CHAN_NOT_FOUND)
- continue;
cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER;
goto error;
}
ua_sess->consumer,
/* is_metadata_channel */ true);
if (ret < 0) {
- /* Per-PID buffer and application going away. */
- if (ret == -LTTNG_ERR_CHAN_NOT_FOUND)
- continue;
cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER;
goto error;
}
+
+ ust_app_put(app);
+ app = NULL;
}
+
+ app = NULL;
break;
}
default:
cmd_ret = LTTNG_OK;
error:
+ ust_app_put(app);
rcu_read_unlock();
return cmd_ret;
}
rcu_read_unlock();
return ret;
}
+
+static void ust_app_release(struct urcu_ref *ref)
+{
+ struct ust_app *app = container_of(ref, struct ust_app, ref);
+
+ ust_app_unregister(app);
+ ust_app_destroy(app);
+}
+
+bool ust_app_get(struct ust_app *app)
+{
+ assert(app);
+ return urcu_ref_get_unless_zero(&app->ref);
+}
+
+void ust_app_put(struct ust_app *app)
+{
+ if (!app) {
+ return;
+ }
+
+ urcu_ref_put(&app->ref, ust_app_release);
+}
projects / lttng-tools.git / blobdiff