Build a list of triggers applying to a given session on creation

[lttng-tools.git] / src / bin / lttng-sessiond / session.c

diff --git a/src/bin/lttng-sessiond/session.c b/src/bin/lttng-sessiond/session.c
index a6281662cf63c23e67b1172b6930e47af3094d10..16431ca15ca19d3cd3260ee99e6a4c5163232d35 100644 (file)
--- a/src/bin/lttng-sessiond/session.c
+++ b/src/bin/lttng-sessiond/session.c
@@ -31,6 +31,7 @@
 
 #include "session.h"
 #include "utils.h"
+#include "trace-ust.h"
 
 /*
  * NOTES:
@@ -133,6 +134,14 @@ void session_lock_list(void)
        pthread_mutex_lock(&ltt_session_list.lock);
 }
 
+/*
+ * Try to acquire session list lock
+ */
+int session_trylock_list(void)
+{
+       return pthread_mutex_trylock(&ltt_session_list.lock);
+}
+
 /*
  * Release session list lock
  */
@@ -141,8 +150,78 @@ void session_unlock_list(void)
        pthread_mutex_unlock(&ltt_session_list.lock);
 }
 
+/*
+ * Get the session's consumer destination type.
+ *
+ * The caller must hold the session lock.
+ */
+enum consumer_dst_type session_get_consumer_destination_type(
+               const struct ltt_session *session)
+{
+       /*
+        * The output information is duplicated in both of those session types.
+        * Hence, it doesn't matter from which it is retrieved. However, it is
+        * possible for only one of them to be set.
+        */
+       return session->kernel_session ?
+                       session->kernel_session->consumer->type :
+                       session->ust_session->consumer->type;
+}
+
+/*
+ * Get the session's consumer network hostname.
+ * The caller must ensure that the destination is of type "net".
+ *
+ * The caller must hold the session lock.
+ */
+const char *session_get_net_consumer_hostname(const struct ltt_session *session)
+{
+       const char *hostname = NULL;
+       const struct consumer_output *output;
+
+       output = session->kernel_session ?
+                       session->kernel_session->consumer :
+                       session->ust_session->consumer;
+
+       /*
+        * hostname is assumed to be the same for both control and data
+        * connections.
+        */
+       switch (output->dst.net.control.dtype) {
+       case LTTNG_DST_IPV4:
+               hostname = output->dst.net.control.dst.ipv4;
+               break;
+       case LTTNG_DST_IPV6:
+               hostname = output->dst.net.control.dst.ipv6;
+               break;
+       default:
+               abort();
+       }
+       return hostname;
+}
+
+/*
+ * Get the session's consumer network control and data ports.
+ * The caller must ensure that the destination is of type "net".
+ *
+ * The caller must hold the session lock.
+ */
+void session_get_net_consumer_ports(const struct ltt_session *session,
+               uint16_t *control_port, uint16_t *data_port)
+{
+       const struct consumer_output *output;
+
+       output = session->kernel_session ?
+                       session->kernel_session->consumer :
+                       session->ust_session->consumer;
+       *control_port = output->dst.net.control.port;
+       *data_port = output->dst.net.data.port;
+}
+
 /*
  * Allocate the ltt_sessions_ht_by_id HT.
+ *
+ * The session list lock must be held.
  */
 int ltt_sessions_ht_alloc(void)
 {
@@ -161,8 +240,10 @@ end:
 
 /*
  * Destroy the ltt_sessions_ht_by_id HT.
+ *
+ * The session list lock must be held.
  */
-void ltt_sessions_ht_destroy(void)
+static void ltt_sessions_ht_destroy(void)
 {
        if (!ltt_sessions_ht_by_id) {
                return;
@@ -201,7 +282,7 @@ end:
  * Return 1 if empty, 0 if not empty.
  * The session list lock must be held.
  */
-static int ltt_sessions_ht_empty()
+static int ltt_sessions_ht_empty(void)
 {
        int ret;
 
@@ -294,17 +375,21 @@ struct ltt_session *session_find_by_id(uint64_t id)
        struct lttng_ht_iter iter;
        struct ltt_session *ls;
 
+       if (!ltt_sessions_ht_by_id) {
+               goto end;
+       }
+
        lttng_ht_lookup(ltt_sessions_ht_by_id, &id, &iter);
        node = lttng_ht_iter_get_node_u64(&iter);
        if (node == NULL) {
-               goto error;
+               goto end;
        }
        ls = caa_container_of(node, struct ltt_session, node);
 
        DBG3("Session %" PRIu64 " found by id.", id);
        return ls;
 
-error:
+end:
        DBG3("Session %" PRIu64 " NOT found by id", id);
        return NULL;
 }
@@ -320,7 +405,7 @@ int session_destroy(struct ltt_session *session)
        /* Safety check */
        assert(session);
 
-       DBG("Destroying session %s", session->name);
+       DBG("Destroying session %s (id %" PRIu64 ")", session->name, session->id);
        del_session_list(session);
        pthread_mutex_destroy(&session->lock);
        del_session_ht(session);
@@ -392,6 +477,12 @@ int session_create(char *name, uid_t uid, gid_t gid)
                goto error;
        }
 
+       new_session->rotate_pending = false;
+       new_session->rotation_state = LTTNG_ROTATION_STATE_NO_ROTATION;
+       new_session->rotate_pending_relay = false;
+       new_session->rotate_relay_pending_timer_enabled = false;
+       new_session->rotate_timer = false;
+
        /* Add new session to the session list */
        session_lock_list();
        new_session->id = add_session_list(new_session);