src/bin/lttng-relayd/lttng-relayd.h

   1 /*
   2  * Copyright (C) 2012 - 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
   6  * it under the terms of the GNU General Public License, version 2 only,
   7  * as 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
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #ifndef LTTNG_RELAYD_H
  20 #define LTTNG_RELAYD_H
  21
  22 #define _LGPL_SOURCE
  23 #include <urcu.h>
  24 #include <urcu/wfqueue.h>
  25
  26 /*
  27  * Queue used to enqueue relay requests
  28  */
  29 struct relay_cmd_queue {
  30         struct cds_wfq_queue queue;
  31         int32_t futex;
  32 };
  33
  34 enum connection_type {
  35         RELAY_DATA,
  36         RELAY_CONTROL,
  37 };
  38
  39 /*
  40  * Represents a session for the relay point of view
  41  */
  42 struct relay_session {
  43         uint64_t id;
  44         struct lttcomm_sock *sock;
  45 };
  46
  47 /*
  48  * Represents a stream in the relay
  49  */
  50 struct relay_stream {
  51         uint64_t stream_handle;
  52         uint64_t prev_seq;      /* previous data sequence number encountered */
  53         struct lttng_ht_node_ulong stream_n;
  54         struct relay_session *session;
  55         struct rcu_head rcu_node;
  56         int fd;
  57
  58         /* Information telling us when to close the stream  */
  59         unsigned int close_flag:1;
  60         uint64_t last_net_seq_num;
  61 };
  62
  63 /*
  64  * Internal structure to map a socket with the corresponding session.
  65  * A hashtable indexed on the socket FD is used for the lookups.
  66  */
  67 struct relay_command {
  68         struct lttcomm_sock *sock;
  69         struct relay_session *session;
  70         struct cds_wfq_node node;
  71         struct lttng_ht_node_ulong sock_n;
  72         struct rcu_head rcu_node;
  73         enum connection_type type;
  74         unsigned int version_check_done:1;
  75 };
  76
  77 #endif /* LTTNG_RELAYD_H */