#include "hashtable.h"
#include "kernel.h"
#include "ust-ctl.h"
+#include "ust-app.h"
+#include "trace-kernel.h"
+#include "trace-ust.h"
/*
* Setup a lttng_event used to enable *all* syscall tracing.
/*
* Enable UST tracepoint event for a channel from a UST session.
*/
-#ifdef DISABLE
-int event_ust_enable_tracepoint(struct ltt_ust_session *usess,
- struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
+int event_ust_enable_tracepoint(struct ltt_ust_session *usess, int domain,
+ struct ltt_ust_channel *uchan, struct lttng_event *event)
{
- int ret;
- struct lttng_ust_event ltt_uevent;
- struct object_data *obj_event;
+ int ret, to_create = 0;
+ struct ltt_ust_event *uevent;
+
+ uevent = trace_ust_find_event_by_name(uchan->events, event->name);
+ if (uevent == NULL) {
+ uevent = trace_ust_create_event(event);
+ if (uevent == NULL) {
+ ret = LTTCOMM_FATAL;
+ goto error;
+ }
+ to_create = 1;
+ }
- strncpy(ltt_uevent.name, uevent->attr.name, sizeof(ltt_uevent.name));
- ltt_uevent.name[sizeof(ltt_uevent.name) - 1] = '\0';
- /* TODO: adjust to other instrumentation types */
- ltt_uevent.instrumentation = LTTNG_UST_TRACEPOINT;
+ switch (domain) {
+ case LTTNG_DOMAIN_UST:
+ {
+ if (to_create) {
+ /* Create event on all UST registered apps for session */
+ ret = ust_app_create_event_all(usess, uchan, uevent);
+ } else {
+ /* Enable event on all UST registered apps for session */
+ ret = ust_app_enable_event_all(usess, uchan, uevent);
+ }
- ret = ustctl_create_event(app->key.sock, <t_uevent,
- uchan->obj, &obj_event);
- if (ret < 0) {
- DBG("Error ustctl create event %s for app pid: %d, sock: %d ret %d",
- uevent->attr.name, app->key.pid, app->key.sock, ret);
- goto next;
+ if (ret < 0) {
+ if (ret == -EEXIST) {
+ ret = LTTCOMM_UST_EVENT_EXIST;
+ } else {
+ ret = LTTCOMM_UST_ENABLE_FAIL;
+ }
+ goto error;
+ }
+
+ DBG("Event UST %s added to channel %s", uevent->attr.name,
+ uchan->name);
+ break;
+ }
+ case LTTNG_DOMAIN_UST_EXEC_NAME:
+ case LTTNG_DOMAIN_UST_PID:
+ case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
+ default:
+ ret = LTTCOMM_NOT_IMPLEMENTED;
+ goto error;
}
- uevent->obj = obj_event;
- uevent->handle = obj_event->handle;
uevent->enabled = 1;
- ret = LTTCOMM_OK;
-end:
+ /* Add ltt ust event to channel */
+ rcu_read_lock();
+ hashtable_add_unique(uchan->events, &uevent->node);
+ rcu_read_unlock();
+
+ return LTTCOMM_OK;
+
+error:
+ trace_ust_destroy_event(uevent);
return ret;
}
-#endif
#ifdef DISABLE
int event_ust_disable_tracepoint(struct ltt_ust_session *ustsession,
// delete_ust_app_ctx(sock, ltctx);
//}
- ustctl_release_object(sock, ua_event->obj);
- free(ua_event->obj);
+ if (ua_event->obj != NULL) {
+ ustctl_release_object(sock, ua_event->obj);
+ free(ua_event->obj);
+ }
free(ua_event);
}
ERR("UST app destroy session hashtable failed");
goto error;
}
- ustctl_release_object(sock, ua_chan->obj);
- free(ua_chan->obj);
+
+ if (ua_chan->obj != NULL) {
+ ustctl_release_object(sock, ua_chan->obj);
+ free(ua_chan->obj);
+ }
free(ua_chan);
error:
return ret;
}
+/*
+ * 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)
+{
+ int ret;
+
+ ret = ustctl_enable(app->key.sock, ua_event->obj);
+ if (ret < 0) {
+ ERR("UST app event %s enable failed for app (pid: %d) "
+ "and session handle %d with ret %d",
+ ua_event->attr.name, app->key.pid, ua_sess->handle, ret);
+ goto error;
+ }
+
+ DBG2("UST app event %s enabled successfully for app (pid: %d)",
+ ua_event->attr.name, app->key.pid);
+
+error:
+ return ret;
+}
+
/*
* Open metadata onto the UST tracer for a UST session.
*/
/*
* Create the specified event onto the UST tracer for a UST session.
*/
-static int create_ust_event(struct ust_app *app,
- struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan,
- struct ust_app_event *ua_event)
+static
+int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
+ struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
{
int ret = 0;
return NULL;
}
+/*
+ * Enable on the tracer side a ust app event for the session and channel.
+ */
+static
+int enable_ust_app_event(struct ust_app_session *ua_sess,
+ struct ust_app_channel *ua_chan, struct ust_app_event *ua_event,
+ struct ust_app *app)
+{
+ int ret;
+
+ ret = enable_ust_event(app, ua_sess, ua_event);
+ if (ret < 0) {
+ goto error;
+ }
+
+ ua_event->enabled = 1;
+
+error:
+ return ret;
+}
+
/*
* Disable on the tracer side a ust app event for the session and channel.
*/
/*
* Create UST app event and create it on the tracer side.
*/
-static struct ust_app_event *create_ust_app_event(
- struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan,
- struct ltt_ust_event *uevent, struct ust_app *app)
+static
+int create_ust_app_event(struct ust_app_session *ua_sess,
+ struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
+ struct ust_app *app)
{
- int ret;
+ int ret = 0;
struct cds_lfht_iter iter;
struct cds_lfht_node *ua_event_node;
struct ust_app_event *ua_event;
/* Get event node */
ua_event_node = hashtable_lookup(ua_chan->events,
(void *)uevent->attr.name, strlen(uevent->attr.name), &iter);
- if (ua_event_node == NULL) {
- DBG2("UST app event %s not found, creating it", uevent->attr.name);
- /* Does not exist so create one */
- ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
- if (ua_event == NULL) {
- /* Only malloc can failed so something is really wrong */
- goto error;
- }
- shadow_copy_event(ua_event, uevent);
+ if (ua_event_node != NULL) {
+ ERR("UST app event %s already exist. Stopping creation.",
+ uevent->attr.name);
+ goto end;
+ }
- hashtable_add_unique(ua_chan->events, &ua_event->node);
- } else {
- ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
+ /* Does not exist so create one */
+ ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
+ if (ua_event == NULL) {
+ /* Only malloc can failed so something is really wrong */
+ ret = -ENOMEM;
+ goto error;
}
+ shadow_copy_event(ua_event, uevent);
+ /* Create it on the tracer side */
ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
if (ret < 0) {
+ delete_ust_app_event(app->key.sock, ua_event);
goto error;
}
- return ua_event;
+ hashtable_add_unique(ua_chan->events, &ua_event->node);
+end:
error:
- return NULL;
+ return ret;
}
/*
}
/*
- * For a specific UST session and UST channel, create the event for all
+ * For a specific UST session and UST channel, the event for all
* registered apps.
*/
int ust_app_disable_event_all(struct ltt_ust_session *usess,
/* For all registered applications */
cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
ua_sess = lookup_session_by_app(usess, app);
- if (ua_sess == NULL) {
- /* Next app */
- continue;
- }
+ /* If ua_sess is NULL, there is a code flow error */
+ assert(ua_sess);
/* Lookup channel in the ust app session */
- ua_chan_node = hashtable_lookup(ua_sess->channels,
- (void *)uchan->name, strlen(uchan->name),
- &uiter);
- if (ua_chan_node == NULL) {
- DBG2("Channel %s not found in session uid %d for app pid %d."
- "Skipping", uchan->name, app->key.pid, usess->uid);
- continue;
- }
+ ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name,
+ strlen(uchan->name), &uiter);
+ /* If the channel is not found, there is a code flow error */
+ assert(ua_chan_node);
+
ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
/* Disable each events of channel */
/* For every registered applications */
cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
- /* Create session on the tracer side and add it to app session HT */
+ /*
+ * Create session on the tracer side and add it to app session HT. Note
+ * that if session exist, it will simply return a pointer to the ust
+ * app session.
+ */
ua_sess = create_ust_app_session(usess, app);
if (ua_sess == NULL) {
continue;
}
/*
- * For a specific UST session and UST channel, create the event for all
- * registered apps.
+ * Enable event for a specific session and channel on the tracer.
*/
-int ust_app_create_event_all(struct ltt_ust_session *usess,
+int ust_app_enable_event_all(struct ltt_ust_session *usess,
struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
{
int ret = 0;
- struct cds_lfht_iter iter;
+ struct cds_lfht_iter iter, uiter;
struct cds_lfht_node *ua_chan_node;
struct ust_app *app;
struct ust_app_session *ua_sess;
struct ust_app_channel *ua_chan;
struct ust_app_event *ua_event;
- DBG("UST app creating event %s for all apps for session uid %d",
+ DBG("UST app enabling event %s for all apps for session uid %d",
uevent->attr.name, usess->uid);
+ /*
+ * NOTE: At this point, this function is called only if the session and
+ * channel passed are already created for all apps. and enabled on the
+ * tracer also.
+ */
+
rcu_read_lock();
/* For all registered applications */
cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
- struct cds_lfht_iter uiter;
+ ua_sess = lookup_session_by_app(usess, app);
+ /* If ua_sess is NULL, there is a code flow error */
+ assert(ua_sess);
- /* Create session on the tracer side and add it to app session HT */
- ua_sess = create_ust_app_session(usess, app);
- if (ua_sess == NULL) {
- continue;
+ /* Lookup channel in the ust app session */
+ ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name,
+ strlen(uchan->name), &uiter);
+ /* If the channel is not found, there is a code flow error */
+ assert(ua_chan_node);
+
+ ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
+
+ /* Enable each events of channel */
+ cds_lfht_for_each_entry(ua_chan->events, &uiter, ua_event, node) {
+ ret = enable_ust_app_event(ua_sess, ua_chan, ua_event, app);
+ if (ret < 0) {
+ /* XXX: Report error someday... */
+ continue;
+ }
}
+ }
+
+ rcu_read_unlock();
+
+ return ret;
+}
+
+/*
+ * For a specific existing UST session and UST channel, creates the event for
+ * all registered apps.
+ */
+int ust_app_create_event_all(struct ltt_ust_session *usess,
+ struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
+{
+ int ret = 0;
+ struct cds_lfht_iter iter, uiter;
+ struct cds_lfht_node *ua_chan_node;
+ struct ust_app *app;
+ struct ust_app_session *ua_sess;
+ struct ust_app_channel *ua_chan;
+
+ DBG("UST app creating event %s for all apps for session uid %d",
+ uevent->attr.name, usess->uid);
+
+ /*
+ * NOTE: At this point, this function is called only if the session and
+ * channel passed are already created for all apps. and enabled on the
+ * tracer also.
+ */
+
+ rcu_read_lock();
+
+ /* For all registered applications */
+ cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
+ ua_sess = lookup_session_by_app(usess, app);
+ /* If ua_sess is NULL, there is a code flow error */
+ assert(ua_sess);
/* Lookup channel in the ust app session */
- ua_chan_node = hashtable_lookup(ua_sess->channels,
- (void *)uchan->name, strlen(uchan->name),
- &uiter);
- if (ua_chan_node == NULL) {
- ERR("Channel %s not found in session uid %d. Skipping",
- uchan->name, usess->uid);
- continue;
- }
+ ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name,
+ strlen(uchan->name), &uiter);
+ /* If the channel is not found, there is a code flow error */
+ assert(ua_chan_node);
+
ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
- ua_event = create_ust_app_event(ua_sess, ua_chan, uevent, app);
- if (ua_event == NULL) {
+ ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
+ if (ret < 0) {
continue;
}
}
ua_sess = lookup_session_by_app(usess, app);
if (ua_sess == NULL) {
- /* Only malloc can failed so something is really wrong */
goto error_rcu_unlock;
}
projects / lttng-tools.git / commitdiff
