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         /*
  44          * This session id is used to identify a set of stream to a tracing session
  45          * but also make sure we have a unique session id associated with a session
  46          * daemon which can provide multiple data source.
  47          */
  48         uint64_t id;
  49         struct lttcomm_sock *sock;
  50 };
  51
  52 /*
  53  * Represents a stream in the relay
  54  */
  55 struct relay_stream {
  56         uint64_t stream_handle;
  57         uint64_t prev_seq;      /* previous data sequence number encountered */
  58         struct lttng_ht_node_ulong stream_n;
  59         struct relay_session *session;
  60         struct rcu_head rcu_node;
  61         int fd;
  62
  63         /* Information telling us when to close the stream  */
  64         unsigned int close_flag:1;
  65         uint64_t last_net_seq_num;
  66         /* Indicate if the stream was initialized for a data pending command. */
  67         unsigned int data_pending_check_done:1;
  68 };
  69
  70 /*
  71  * Internal structure to map a socket with the corresponding session.
  72  * A hashtable indexed on the socket FD is used for the lookups.
  73  */
  74 struct relay_command {
  75         struct lttcomm_sock *sock;
  76         struct relay_session *session;
  77         struct cds_wfq_node node;
  78         struct lttng_ht_node_ulong sock_n;
  79         struct rcu_head rcu_node;
  80         enum connection_type type;
  81         unsigned int version_check_done:1;
  82 };
  83
  84 #endif /* LTTNG_RELAYD_H */