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 #include <common/hashtable/hashtable.h>
  26
  27 /*
  28  * Queue used to enqueue relay requests
  29  */
  30 struct relay_cmd_queue {
  31         struct cds_wfq_queue queue;
  32         int32_t futex;
  33 };
  34
  35 enum connection_type {
  36         RELAY_DATA,
  37         RELAY_CONTROL,
  38 };
  39
  40 /*
  41  * Represents a session for the relay point of view
  42  */
  43 struct relay_session {
  44         /*
  45          * This session id is used to identify a set of stream to a tracing session
  46          * but also make sure we have a unique session id associated with a session
  47          * daemon which can provide multiple data source.
  48          */
  49         uint64_t id;
  50         struct lttcomm_sock *sock;
  51 };
  52
  53 /*
  54  * Represents a stream in the relay
  55  */
  56 struct relay_stream {
  57         uint64_t stream_handle;
  58         uint64_t prev_seq;      /* previous data sequence number encountered */
  59         struct lttng_ht_node_ulong stream_n;
  60         struct relay_session *session;
  61         struct rcu_head rcu_node;
  62         int fd;
  63         int index_fd;
  64
  65         char *path_name;
  66         char *channel_name;
  67         /* on-disk circular buffer of tracefiles */
  68         uint64_t tracefile_size;
  69         uint64_t tracefile_size_current;
  70         uint64_t tracefile_count;
  71         uint64_t tracefile_count_current;
  72
  73         /* Information telling us when to close the stream  */
  74         unsigned int close_flag:1;
  75         uint64_t last_net_seq_num;
  76         /* Indicate if the stream was initialized for a data pending command. */
  77         unsigned int data_pending_check_done:1;
  78 };
  79
  80 /*
  81  * Internal structure to map a socket with the corresponding session.
  82  * A hashtable indexed on the socket FD is used for the lookups.
  83  */
  84 struct relay_command {
  85         struct lttcomm_sock *sock;
  86         struct relay_session *session;
  87         struct cds_wfq_node node;
  88         struct lttng_ht_node_ulong sock_n;
  89         struct rcu_head rcu_node;
  90         enum connection_type type;
  91         unsigned int version_check_done:1;
  92         /* protocol version to use for this session */
  93         uint32_t major;
  94         uint32_t minor;
  95 };
  96
  97 extern char *opt_output_path;
  98
  99 #endif /* LTTNG_RELAYD_H */