#include "buffer-registry.h"
#include "trace-ust.h"
#include "utils.h"
+#include "ust-app.h"
/*
* Match function for the events hash table lookup.
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_INVALID;
+ 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_INVALID;
+ 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) {
+ retval = LTTNG_ERR_INVALID;
+ 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;
+}
+
/*
* RCU safe free context structure.
*/
consumer_destroy_output(session->consumer);
consumer_destroy_output(session->tmp_consumer);
+ fini_pid_tracker(&session->pid_tracker);
+
free(session);
}
projects / lttng-tools.git / blobdiff