src/bin/lttng-relayd/session.c

   1 /*
   2  * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
   3  *                      David Goulet <dgoulet@efficios.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License, version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 51
  16  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include "session.h"
  20
  21 /*
  22  * Lookup a session within the given hash table and session id. RCU read side
  23  * lock MUST be acquired before calling this and as long as the caller has a
  24  * reference to the object.
  25  *
  26  * Return session or NULL if not found.
  27  */
  28 struct relay_session *session_find_by_id(struct lttng_ht *ht, uint64_t id)
  29 {
  30         struct relay_session *session = NULL;
  31         struct lttng_ht_node_ulong *node;
  32         struct lttng_ht_iter iter;
  33
  34         assert(ht);
  35
  36         lttng_ht_lookup(ht, (void *)((unsigned long) id), &iter);
  37         node = lttng_ht_iter_get_node_ulong(&iter);
  38         if (!node) {
  39                 goto end;
  40         }
  41         session = caa_container_of(node, struct relay_session, session_n);
  42
  43 end:
  44         return session;
  45 }