/*
* ltt-probes.c
*
- * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
* Holds LTTng probes registry.
*
- * Dual LGPL v2.1/GPL v2 license.
+ * Copyright 2010-2012 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include <errno.h>
#include <urcu/list.h>
-#include <lttng/core.h>
+#include <urcu/hlist.h>
#include <lttng/ust-events.h>
+#include <lttng/tracepoint.h>
+#include "tracepoint-internal.h"
#include <assert.h>
+#include <helper.h>
+#include <ctype.h>
#include "ltt-tracer-core.h"
+#include "jhash.h"
+#include "error.h"
/*
* probe list is protected by ust_lock()/ust_unlock().
*/
static CDS_LIST_HEAD(probe_list);
+static
+const struct lttng_probe_desc *find_provider(const char *provider)
+{
+ struct lttng_probe_desc *iter;
+
+ cds_list_for_each_entry(iter, &probe_list, head) {
+ if (!strcmp(iter->provider, provider))
+ return iter;
+ }
+ return NULL;
+}
+
static
const struct lttng_event_desc *find_event(const char *name)
{
cds_list_for_each_entry(probe_desc, &probe_list, head) {
for (i = 0; i < probe_desc->nr_events; i++) {
- if (!strcmp(probe_desc->event_desc[i].name, name))
- return &probe_desc->event_desc[i];
+ if (!strncmp(probe_desc->event_desc[i]->name, name,
+ LTTNG_UST_SYM_NAME_LEN - 1))
+ return probe_desc->event_desc[i];
}
}
return NULL;
int ltt_probe_register(struct lttng_probe_desc *desc)
{
+ struct lttng_probe_desc *iter;
int ret = 0;
int i;
ust_lock();
+ if (find_provider(desc->provider)) {
+ ret = -EEXIST;
+ goto end;
+ }
/*
* TODO: This is O(N^2). Turn into a hash table when probe registration
* overhead becomes an issue.
*/
for (i = 0; i < desc->nr_events; i++) {
- if (find_event(desc->event_desc[i].name)) {
+ if (find_event(desc->event_desc[i]->name)) {
ret = -EEXIST;
goto end;
}
}
- cds_list_add(&desc->head, &probe_list);
+ /*
+ * We sort the providers by struct lttng_probe_desc pointer
+ * address.
+ */
+ cds_list_for_each_entry_reverse(iter, &probe_list, head) {
+ BUG_ON(iter == desc); /* Should never be in the list twice */
+ if (iter < desc) {
+ /* We belong to the location right after iter. */
+ cds_list_add(&desc->head, &iter->head);
+ goto desc_added;
+ }
+ }
+ /* We should be added at the head of the list */
+ cds_list_add(&desc->head, &probe_list);
+desc_added:
+ DBG("just registered probe %s containing %u events",
+ desc->provider, desc->nr_events);
/*
* fix the events awaiting probe load.
*/
for (i = 0; i < desc->nr_events; i++) {
- ret = pending_probe_fix_events(&desc->event_desc[i]);
+ const struct lttng_event_desc *ed;
+
+ ed = desc->event_desc[i];
+ DBG("Registered event probe \"%s\" with signature \"%s\"",
+ ed->name, ed->signature);
+ ret = pending_probe_fix_events(ed);
assert(!ret);
}
end:
{
ust_lock();
cds_list_del(&desc->head);
+ DBG("just unregistered probe %s", desc->provider);
ust_unlock();
}
{
}
-#if 0
-static
-void *tp_list_start(struct seq_file *m, loff_t *pos)
+void ltt_probes_prune_event_list(struct lttng_ust_tracepoint_list *list)
{
- struct lttng_probe_desc *probe_desc;
- int iter = 0, i;
+ struct tp_list_entry *list_entry, *tmp;
- pthread_mutex_lock(&probe_mutex);
- cds_list_for_each_entry(probe_desc, &probe_list, head) {
- for (i = 0; i < probe_desc->nr_events; i++) {
- if (iter++ >= *pos)
- return (void *) &probe_desc->event_desc[i];
- }
+ cds_list_for_each_entry_safe(list_entry, tmp, &list->head, head) {
+ cds_list_del(&list_entry->head);
+ free(list_entry);
}
- /* End of list */
- return NULL;
}
-static
-void *tp_list_next(struct seq_file *m, void *p, loff_t *ppos)
+/*
+ * called with UST lock held.
+ */
+int ltt_probes_get_event_list(struct lttng_ust_tracepoint_list *list)
{
struct lttng_probe_desc *probe_desc;
- int iter = 0, i;
+ int i;
- (*ppos)++;
+ CDS_INIT_LIST_HEAD(&list->head);
cds_list_for_each_entry(probe_desc, &probe_list, head) {
for (i = 0; i < probe_desc->nr_events; i++) {
- if (iter++ >= *ppos)
- return (void *) &probe_desc->event_desc[i];
+ struct tp_list_entry *list_entry;
+
+ list_entry = zmalloc(sizeof(*list_entry));
+ if (!list_entry)
+ goto err_nomem;
+ cds_list_add(&list_entry->head, &list->head);
+ strncpy(list_entry->tp.name,
+ probe_desc->event_desc[i]->name,
+ LTTNG_UST_SYM_NAME_LEN);
+ list_entry->tp.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
+ if (!probe_desc->event_desc[i]->loglevel) {
+ list_entry->tp.loglevel = TRACE_DEFAULT;
+ } else {
+ list_entry->tp.loglevel = *(*probe_desc->event_desc[i]->loglevel);
+ }
}
}
- /* End of list */
- return NULL;
+ if (cds_list_empty(&list->head))
+ list->iter = NULL;
+ else
+ list->iter =
+ cds_list_first_entry(&list->head, struct tp_list_entry, head);
+ return 0;
+
+err_nomem:
+ ltt_probes_prune_event_list(list);
+ return -ENOMEM;
}
-static
-void tp_list_stop(struct seq_file *m, void *p)
+/*
+ * Return current iteration position, advance internal iterator to next.
+ * Return NULL if end of list.
+ */
+struct lttng_ust_tracepoint_iter *
+ lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list)
{
- pthread_mutex_unlock(&probe_mutex);
+ struct tp_list_entry *entry;
+
+ if (!list->iter)
+ return NULL;
+ entry = list->iter;
+ if (entry->head.next == &list->head)
+ list->iter = NULL;
+ else
+ list->iter = cds_list_entry(entry->head.next,
+ struct tp_list_entry, head);
+ return &entry->tp;
}
-static
-int tp_list_show(struct seq_file *m, void *p)
+/*
+ * marshall all probes/all events and create those that fit the
+ * wildcard. Add them to the events list as created.
+ */
+void ltt_probes_create_wildcard_events(struct wildcard_entry *entry,
+ struct session_wildcard *wildcard)
{
- const struct lttng_event_desc *probe_desc = p;
+ struct lttng_probe_desc *probe_desc;
+ struct lttng_ust_event event_param;
+ int i;
- /*
- * Don't export lttng internal events (metadata).
- */
- if (!strncmp(probe_desc->name, "lttng_", sizeof("lttng_") - 1))
- return 0;
- seq_printf(m, "event { name = %s; };\n",
- probe_desc->name);
- return 0;
-}
+ cds_list_for_each_entry(probe_desc, &probe_list, head) {
+ for (i = 0; i < probe_desc->nr_events; i++) {
+ const struct lttng_event_desc *event_desc;
+ int match = 0;
-static
-const struct seq_operations lttng_tracepoint_list_seq_ops = {
- .start = tp_list_start,
- .next = tp_list_next,
- .stop = tp_list_stop,
- .show = tp_list_show,
-};
+ event_desc = probe_desc->event_desc[i];
+ /* compare excluding final '*' */
+ assert(strlen(entry->name) > 0);
+ if (strcmp(event_desc->name, "lttng_ust:metadata")
+ && (strlen(entry->name) == 1
+ || !strncmp(event_desc->name, entry->name,
+ strlen(entry->name) - 1))) {
+ if (ltt_loglevel_match(event_desc,
+ entry->loglevel_type,
+ entry->loglevel)) {
+ match = 1;
+ }
+ }
+ if (match) {
+ struct ltt_event *ev;
+ int ret;
-static
-int lttng_tracepoint_list_open(struct inode *inode, struct file *file)
-{
- return seq_open(file, <tng_tracepoint_list_seq_ops);
+ memcpy(&event_param, &wildcard->event_param,
+ sizeof(event_param));
+ strncpy(event_param.name,
+ event_desc->name,
+ sizeof(event_param.name));
+ event_param.name[sizeof(event_param.name) - 1] = '\0';
+ /* create event */
+ ret = ltt_event_create(wildcard->chan,
+ &event_param, NULL,
+ &ev);
+ if (ret) {
+ DBG("Error creating event");
+ continue;
+ }
+ cds_list_add(&ev->wildcard_list,
+ &wildcard->events);
+ }
+ }
+ }
}
-const struct file_operations lttng_tracepoint_list_fops = {
- .open = lttng_tracepoint_list_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release,
-};
-#endif //0
projects / lttng-ust.git / blobdiff